CN208863094U - A kind of Dimmable LED driving circuit - Google Patents
A kind of Dimmable LED driving circuit Download PDFInfo
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- CN208863094U CN208863094U CN201821172528.7U CN201821172528U CN208863094U CN 208863094 U CN208863094 U CN 208863094U CN 201821172528 U CN201821172528 U CN 201821172528U CN 208863094 U CN208863094 U CN 208863094U
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Abstract
The utility model proposes a kind of Dimmable LED driving circuit, circuit includes: controllable silicon dimmer, leakage current circuit, LED circuit；The leakage current circuit provides the electric current needed for the controllable silicon dimmer when input voltage is not up to the conducting voltage of the LED circuit；It is characterized by further comprising: silicon-controlled cut wave angle detection circuitry and leakage current control circuit；After the controllable silicon dimmer conducting, the silicon-controlled wave angle detection circuitry of cutting obtains silicon-controlled the first electrical parameter signal for cutting wave angle degree of characterization；The first electrical parameter signal is compared by the leakage current control circuit with first threshold, to control the leakage current circuit.In addition, also increasing output current compensation circuit, for electrical parameter signal to be compared with second threshold, to control the electric current of LED circuit.
Description
Technical field
The utility model relates to LED drive circuit field more particularly to a kind of Dimmable LED driving circuits.
Background technique
LED driving generallys use linear drive mode, has structure simple, EMI (Electro-Magnetic
Interference, electromagnetic interference) it is small, and compatible most of controllable silicon dimmer realizes the advantages such as light modulation.But linearly
LED driving is in cooperation controllable silicon dimmer in use, in order to maintain controlled silicon conducting, it is necessary to (bleeder) electric current of releasing,
Circuit as shown in Figure 1, this undoubtedly increases the loss of system, reduces the efficiency of system, can not improve systematic difference power.
In addition, controlled silicon conducting angle will appear flashing light problem when smaller, this is because silicon-controlled cut the peak inputted after wave
Threshold voltage close to output LED light voltage when, controllable silicon dimmer, which cuts wave, will appear serious asymmetry so that it is silicon-controlled cut wave after
Crest voltage it is acyclic be more than or less than output LED voltage (such as Fig. 2, Vin_pk1 > VLED > Vin_pk2), lead to LED
Lamp current acute variation, and the frequency of the curent change is less than the identification frequency of human eye, so that it is existing the visible flashing light of human eye occur
As.
Utility model content
To solve the above-mentioned problems, the utility model proposes a kind of Dimmable LED driving circuits.
The utility model proposes a kind of Dimmable LED driving circuits, comprising: controllable silicon dimmer, leakage current circuit,
LED circuit；The leakage current circuit provides described controllable when input voltage is not up to the conducting voltage of the LED circuit
Electric current needed for silicon light modulator；Further include: it is silicon-controlled to cut wave angle detection circuitry and leakage current control circuit；It is described silicon-controlled
After dimmer conduction, the silicon-controlled wave angle detection circuitry of cutting obtains silicon-controlled the first electrical parameter letter for cutting wave angle degree of characterization
Number；The first electrical parameter signal is compared by the leakage current control circuit with first threshold, to control described release
Current circuit.
Preferably, the leakage current control circuit is detecting the first electrical parameter signal greater than first threshold, control
The leakage current circuit shutdown is made, stops providing leakage current.
Preferably, characterization is flowed through the second electrical parameter and the of the LED circuit electric current by the leakage current control circuit
Three threshold values are compared, when the first electrical parameter signal is less than the first threshold and the second electrical parameter signal is less than institute
When stating third threshold value, the leakage current control circuit controls the leakage current circuit and opens, and provides leakage current.
Preferably, the first electrical parameter signal corresponds to input voltage in one cycle from the controllable silicon dimmer
Starting conducting cut wave angle degree and start to the average value during end cycle.
Preferably, the silicon-controlled wave angle detection circuitry of cutting includes integrating circuit, and the integrating circuit is used for input
Voltage integrating meter, to provide the first electrical parameter signal.
Preferably, further includes: output current compensation circuit, the output current compensation circuit believe first electrical parameter
It number is compared with second threshold, to control the electric current for flowing through the LED circuit (30)；Wherein, second threshold is less than the first threshold
It is worth and shows the crest voltage of the input voltage after controllable silicon dimmer cuts wave close to the conducting voltage of LED circuit.
Preferably, the output current compensation circuit includes the first trsanscondutance amplifier；First trsanscondutance amplifier is used for
When the first electrical parameter signal is less than the second threshold, the output current compensation circuit exports electric current, flows through LED to reduce
The peak point current of the electric current of circuit.
Preferably, the output current compensation circuit further includes the second trsanscondutance amplifier；Second trsanscondutance amplifier is used
In when the first electrical parameter signal is less than four threshold values, the output electric current of first trsanscondutance amplifier is limited；Wherein described
Two threshold values are greater than the 4th threshold value.
Preferably, the leakage current control circuit includes that the first comparison amplifier joins the first threshold and the first electricity
Number signal is compared；Second comparison amplifier is compared third threshold value and the second electrical parameter signal.
Preferably, the leakage current circuit includes current source and switching circuit；The current source and the switching circuit
Be connected in series, the switching circuit release under the control of the leakage current control circuit (70) unlatching or shutdown of releasing.
Preferably, the first electrical parameter signal corresponds to the reference electricity in a second electrical parameter signal sampling period
Mean value is flattened, the second electrical parameter characterization flows through the electric current of the LED circuit.
Preferably, the silicon-controlled wave angle detection circuitry of cutting includes the first operational amplifier U1 and sample integration circuit,
The positive input of the first operational amplifier U1 connects the second electrical parameter signal, the reverse input end of the first operational amplifier U1
The 5th threshold value is connect, the output end of the first operational amplifier U1 is connected with sample integration circuit, and ginseng is connect on sample integration circuit
Voltage is examined, the output termination leakage current control circuit of sample integration circuit is used for the first electrical parameter signal after calculation process
Input leakage current control circuit.
Preferably, it is to start and with the second electrical parameter letter that the first electrical parameter signal, which corresponds to input voltage rising edge,
Number failing edge is the reference voltage average value determined by terminated in a sampling period, the second electrical parameter characterization stream
Cross the electric current of the LED circuit.
The utility model is switched on and off by control leakage current, improves linear silicon-controlled LED drive circuit
Efficiency and stability, while solving the problems, such as or improving the flashing of controllable silicon dimmer low-angle.
Detailed description of the invention
Fig. 1 is Dimmable LED driving circuit figure in the prior art；
Fig. 2 is Ics electric current, LED when the controllable silicon dimmer conducting of Dimmable LED driving circuit in the prior art is smaller
The waveform diagram of electric current；
Fig. 3 is that wave is cut in the conducting of the input voltage vin and controllable silicon dimmer after the rectification of the utility model a cycle
Angular relationship；
Fig. 4 is power loss schematic diagram caused by the leakage current of Dimmable LED driving circuit in the prior art；
Fig. 5 is a kind of Dimmable LED driving circuit figure provided by the embodiment of the utility model；
Fig. 6 is power loss schematic diagram when leakage current circuit provided by the embodiment of the utility model opens or closes；
Fig. 7, which is that one kind provided by the embodiment of the utility model is silicon-controlled, cuts wave angle detection circuitry schematic diagram；
Fig. 8 is a kind of leakage current control circuit schematic diagram for controlling leakage current provided by the embodiment of the utility model；
Fig. 9 A, 9B and 9C are three kinds of Ics electric currents, ILED electric current and controllable silicon dimmer provided by the embodiment of the utility model
Cut the relation schematic diagram of wave angle degree；
When Figure 10 is the silicon-controlled peak point current for cutting wave angle detection circuitry reduction Ics provided by the embodiment of the utility model
Corresponding leakage current schematic diagram；
Figure 11 is a kind of output current compensation circuit schematic diagram for solving flashing light provided by the embodiment of the utility model；
Figure 12 is a kind of output current compensation circuit signal for improving low-angle flashing light provided by the embodiment of the utility model
Figure.
Figure 13 is another Dimmable LED driving circuit figure provided by the embodiment of the utility model；
Figure 14 is that the utility model detects the second electrical parameter signal embodiment circuit diagram；
Figure 15 is another Dimmable LED driving circuit figure provided by the embodiment of the utility model；
Figure 16 is the circuit diagram that the utility model detects input voltage and the second electrical parameter signal embodiment；
Figure 17 is the waveform diagram that the utility model detects input voltage and the second electrical parameter signal embodiment.
Specific embodiment
To make the technical solution of the utility model embodiment and becoming apparent from for advantage expression, below by attached drawing and implementation
Example, is described in further detail the technical solution of the utility model.
In following the utility model embodiment, angle is uniformly used in the description for cutting wave angle degree to the conducting of controllable silicon dimmer 10
Amount.Fig. 3 illustrates the input voltage vin after the rectification of a cycle, and wherein θ 1 is that wave angle degree is cut in the smallest starting conducting, is connected
Cut any angle that wave is likely to occur between θ 1- π.θ 2 is that a possibility of wave angle degree is cut in the starting conducting of controllable silicon dimmer
Example, and 1 < θ of θ 2.π-θ 1 and π-θ 2 be respectively 2 angle of θ 1 and θ under controllable silicon dimmer conducting width.Input voltage
The maximum value Vpeak of Vin appears in the angle of pi/2.
Fig. 1 is a kind of Dimmable LED driving circuit in the prior art comprising: it is AC power supplies, controllable silicon dimmer 10, whole
Flow bridge, leakage current circuit 20, LED circuit 30, power control circuit 40, metal-oxide-semiconductor 50 and sampling resistor Rcs.In the circuit
In, the input terminal of controllable silicon dimmer 10 and rectifier bridge is connected in series, and is powered by AC power supplies.One output end of rectifier bridge
Ground connection, another output connect input voltage vin；The output end of rectifier bridge provides full-wave rectified voltage, as input voltage
Vin, driving voltage of the input voltage as driving LED circuit.
LED circuit 30, metal-oxide-semiconductor 50 and sampling resistor Rcs are sequentially connected in series, and the other end of LED circuit 30 connects input voltage
The other end of Vin, sampling resistor Rcs are grounded；One end of leakage current circuit 20 connects input voltage vin, other end ground connection；
The first input end of power control circuit 40 connects reference voltage VREF, and the second input terminal is connected to metal-oxide-semiconductor 50 and resistance Rcs
Centre, output end are connected to the grid of metal-oxide-semiconductor 50.In one example, LED circuit 30 includes concatenated LED light and therewith
Resistor capacitor circuit in parallel.
After controllable silicon dimmer 10 is connected, certain electric current is needed to maintain its conducting, is not reached in input voltage vin
To the conducting voltage V of LED circuit 30LEDBefore, LED circuit 30 does not turn on, therefore provides one by increasing leakage current circuit 20
Controllable silicon dimmer 10 is connected in a electric current；After the conducting voltage that input voltage vin reaches LED circuit 30, LED circuit 30
Conducting, circuit can generate electric current, and the electric current that at this moment controllable silicon dimmer 10 needs can be substituted by the electric current of LED circuit 30.
In addition when input voltage vin is less than the conducting voltage of LED circuit 30, LED circuit 30 can not be connected, at this time controllable silicon light modulation
Device 10 is also required to leakage current circuit 20 to provide electric current.
Since the leakage current that leakage current circuit 20 generates is not load current, it will cause a large amount of losses.Thyristor regulating
Light device 10 generally has maximum conducting width.Fig. 4 is illustrated in the maximum circuit loss situation be connected under width.As shown in figure 4,
The total loss of circuit is Ptotal=PA+PB+PC.Wherein PA and PC is to be lost caused by leakage current, and PB is linear LED drive
Move intrinsic loss, the i.e. loss of input voltage and the generation of LED voltage pressure difference.With begin to turn on until input voltage vin be greater than
The loss PA in this stage of the conducting voltage of LED circuit 30 is compared, and input voltage vin reduces until being less than LED circuit 30
The loss PC of this stage leakage current of conducting voltage is larger.
Fig. 5 is a kind of Dimmable LED driving circuit figure provided by the embodiment of the utility model.As shown in figure 5, in tunable optical
On LED drive circuit, increases and silicon-controlled cut wave angle detection circuitry 60 and leakage current control circuit 70.Wherein, silicon-controlled
The input terminal connection input voltage vin of wave angle detection circuitry 60 is cut, output end connects the first of leakage current control circuit 70
Input terminal；Then the second input terminal of leakage current control circuit 70 is connected between the drain electrode of metal-oxide-semiconductor 50 and resistance Rcs,
Output end is connected to leakage current circuit 20.
Controllable silicon dimmer 10 conducting after, AC supply voltage Vac after 10 angle of flow of controllable silicon dimmer cuts wave, with
The mode of full-wave rectified voltage be supplied to it is silicon-controlled cut wave angle detection circuitry 60, it is silicon-controlled to cut the detection of wave angle detection circuitry 60
Wave angle, θ is cut in the starting conducting of controllable silicon dimmer 10, is then cut wave angle, θ by the starting conducting of controllable silicon dimmer 10 and is turned
Dissolve an electrical parameter signal Vout.
Electrical parameter signal Vout characterization is silicon-controlled to cut wave angle degree.In one example, electrical parameter signal Vout corresponds to defeated
Enter voltage Vin in one cycle since wave angle degree is cut in the starting conducting of controllable silicon dimmer 10 to flat during end cycle
Mean value.
Before the conducting of LED circuit 30, leakage current control circuit 70 silicon-controlled cuts wave angle detection circuitry 60 receiving
After the electrical parameter signal Vout of output, according to its internal first threshold being arranged, by electrical parameter signal Vout and first threshold into
Row compares.When electrical parameter signal Vout is less than first threshold, leakage current control circuit 70 opens leakage current circuit 20
Conducting, provides leakage current；When electrical parameter signal Vout is greater than first threshold, leakage current control circuit 70 turns off vent discharge
Current circuit 20 stops providing leakage current.
Preferably, when electrical parameter signal Vout is greater than first threshold, leakage current can be first turned off, postponed after 1ms again
Leakage current circuit 20 is opened, a lesser leakage current is provided.
Preferably, when electrical parameter signal Vout is greater than first threshold, the offer of leakage current circuit 20 one is lesser to be let out
Discharge stream.
In one embodiment, the first threshold being arranged in leakage current control circuit 70 substantially meets wanting for formula (1)
It asks, it may be assumed that
PA+PB≥PB1+PC (1)
Fig. 6 is power loss schematic diagram when leakage current circuit opens or closes.Fig. 6 illustrates there are two half-wave, the left side
Half-wave corresponds to the loss situation that controllable silicon dimmer 10 is in the case of maximum conducting width, which is PA+PB.The right
Half-wave corresponds to the case where controllable silicon dimmer 10 is in any conducting width, and loss at that time is PB1+PC.If PB1 compared with
Greatly, condition (1) is unsatisfactory for, then needs to consider to close leakage current circuit 20, or reduce its current loss.
In one example, first threshold, which corresponds to input voltage vin, has the first in a controllable silicon dimmer 10
Begin to be connected in the period for cutting wave angle degree and originate wave angle degree is cut in conducting since first to the average value during end cycle；Wherein,
Controllable silicon dimmer 10 have this first starting conducting cut wave angle degree intraperiod line LED driving loss (part PA) and
The sum of the circuit loss (part PB) of leakage current circuit 20 in the case where not adjusting output electric current is originated with minimum
The loss (part PB1) of the intraperiod line LED driving of wave angle degree is cut in conducting and input voltage vin is not up to the LED circuit
The sum of circuit loss (part PC) of leakage current circuit is suitable before 30 conducting voltage.That is the first threshold being arranged at this time
Value is critical value, if the corresponding average value of first threshold is greater than this critical value, circuit cannot play reduction power consumption
Effect.
In one embodiment, the one kind provided as shown in Figure 7 is silicon-controlled to cut wave angle detection circuitry 60, including integral electricity
Road.In one example, integrating circuit is made of resistance Rset1, resistance Rset2 and capacitor Cset1.Resistance Rset1 and resistance
Rset2 constitutes bleeder circuit and is connected between Vin and ground, and capacitor Cset1 and resistance Rset2 are in parallel.Circuit described in Fig. 7, first
Vin is divided by resistance Rset1 and Rset2 to generate the manageable voltage of control circuit of releasing, capacitor Cset1 will be above-mentioned
Voltage carries out integral filtering, and generated Vout is that input voltage vin is cut from the starting of the controllable silicon dimmer 10 conducting
Wave angle degree starts the average value to after scaled down during end cycle.
Optionally, it is cut in wave angle detection circuitry 60 silicon-controlled, it can be in two resistance of resistance Rset1 and resistance Rset2
Intermediate node keeps the ripple of electrical parameter signal Vout more preferable to a resistance Rset3 is added between capacitor Cset1.
Input voltage vin be input to it is silicon-controlled when cutting wave angle detection circuitry 60, it is silicon-controlled to cut wave angle detection circuitry 60
Wave angle degree is cut by what the series-parallel mode of resistance capacitance detected controllable silicon dimmer 10, thus rising controllable silicon dimmer 10
Beginning conducting cuts wave angle, θ and is converted into a specific electrical parameter signal Vout.The initial voltage value of controllable silicon dimmer 10 can be with
The bigger electrical parameter of capacitor by adjusting the resistance ratio flexible setting of resistance Rset1 and resistance Rset2, and capacitor Cset1 is believed
The ripple of number Vout is smaller.In the case where resistance capacitance parameter determines, the voltage of electrical parameter signal Vout is with thyristor regulating
The starting conducting of light device 10 is cut the increase of wave angle, θ and is gradually reduced, available by formula (2):
Wherein, alternating voltage Vac=Vpeaksin θ, Vpeak indicate the voltage max of AC power source, and θ indicates controllable
Wave angle degree is cut in the input voltage starting conducting of silicon light modulator 10.
Preferably, first threshold is by taking voltage threshold VREF1 as an example, then controllable silicon dimmer 10 originates angle of flow threshold θ th
It can be obtained by counter push away of formula (2):
According to formula (3) it is found that first threshold has determined 10 angle of flow threshold θ th of controllable silicon dimmer.When silicon-controlled
When light modulator 10 originates angle of flow θ < θ th, leakage current control circuit 70 turns off the conducting of leakage current circuit 20, stops mentioning
For leakage current；As silicon-controlled starting angle of flow θ > θ th, leakage current control circuit 70 opens leakage current circuit 20
Conducting, provides leakage current.
Optionally, leakage current can be that variable current is released when controllable silicon dimmer 10 originates conduction angle < θ th
Current circuit 20 stops providing leakage current, after the specific delays time, then provides a lesser leakage current.
Optionally, leakage current can be that variable current is released when controllable silicon dimmer 10 originates conduction angle < θ th
Current circuit 20 provide a lesser leakage current, with realize controllable silicon dimmer 10 turn off after to bus discharge.
In one embodiment of control leakage current, it is big that leakage current control circuit 70 receives electrical parameter signal Vout
It in first threshold, controls leakage current circuit 20 and turns off, stop providing leakage current；At this time since LED circuit 30 is connected, release
Current control circuit 70 initially receives the voltage Vcs of sampling resistor Rcs, which characterizes the electricity for flowing through the LED circuit 30
Stream, is hereafter known as electrical parameter signal Vcs for voltage Vcs；Then it is compared with built-in third threshold value, when electrical parameter signal
For Vout less than first threshold and when voltage Vcs is less than third threshold value, leakage current control circuit 70 controls leakage current circuit 20
It opens, leakage current is provided.
As shown in figure 13, the silicon-controlled embodiment for cutting wave angle detection circuitry 60 is not only above-mentioned a kind of electric by detection input
Pressure Vin obtains characterizing the silicon-controlled embodiment for cutting wave angle degree electrical parameter signal Vout, can also be by detecting electrical parameter signal Vcs
Obtain electrical parameter signal Vout.It is ordered respectively to be distinguish this section of explanation for electrical parameter signal Vcs and electrical parameter signal Vout
Entitled first electrical parameter signal Vout and the second electrical parameter signal Vcs.The silicon-controlled wave angle detection circuitry 60 cut in Figure 13
Input connects the common end between the source electrode of metal-oxide-semiconductor 50 and resistance Rcs, the silicon-controlled output difference for cutting wave angle detection circuitry 60
Connect with output current compensation circuit 80 and leakage current control circuit 70, the first electrical parameter signal Vout corresponds at one the
Reference voltage average value in two electrical parameter signal Vcs sampling periods, the second electrical parameter signal Vcs characterization flow through described
The electric current of LED circuit 30.
The circuit for detecting the second electrical parameter signal embodiment is as shown in figure 14, and the silicon-controlled wave angle degree of cutting in Figure 14 detects electricity
Road 60 includes the first operational amplifier U1 and sample integration circuit 61, and the positive input of the first operational amplifier U1 connects the
Two electrical parameter signal Vcs, the reverse input end of the first operational amplifier U1 connects the 5th threshold value, silicon-controlled to cut wave angle detection circuitry
60 couples of second electrical parameter signal Vcs for being greater than the 5th threshold value are sampled, and the output end of the first operational amplifier U1 and sampling are accumulated
Parallel circuit 61 is connected, and reference voltage is connect on sample integration circuit 61, and the output of sample integration circuit 61 terminates leakage current
Control circuit 70 is used to the first electrical parameter signal Vout after calculation process inputting leakage current control circuit 70.Preferably,
Two NOT gates being arranged in series are additionally provided between the output end of first operational amplifier U1 and the input terminal of sample integration circuit 61.
Common end between two NOT gates is connected with the control terminal of one of switch in sample integration circuit 61, with sample integration electricity
The output end of the connected NOT gate in road 61 is connected with the control terminal of another switch in sample integration circuit 61, two be arranged in series
Reference voltage other end ground connection is connect on a switch one end, two switch public termination integrating resistors are gone back between integrating resistor and ground
Equipped with integrating capacitor.First operational amplifier U1 is adopted according to the second electrical parameter signal Vcs and the comparison result control of the 5th threshold value
The charge and discharge time of sample integrating circuit 61 obtains characterizing silicon-controlled the first electrical parameter signal Vout for cutting wave angle degree in turn.Pass through inspection
Survey electrical parameter signal Vcs improves accuracy in detection to obtain the silicon-controlled mode for cutting wave angle degree electrical parameter signal Vout of characterization,
Sampling process is more easy to be reliable simultaneously.
As shown in figure 15, the silicon-controlled embodiment for cutting wave angle detection circuitry 60 can also by and meanwhile detect input voltage
Vin and the second electrical parameter signal Vcs obtain electrical parameter signal Vout.It is silicon-controlled in Figure 15 to cut the defeated of wave angle detection circuitry 60
Enter the common end not only between the source electrode of metal-oxide-semiconductor 50 and resistance Rcs to be connected, also be connected with the voltage bus of LED drive circuit
For acquiring input voltage vin.It is to start and with second that first electrical parameter signal Vout, which corresponds to input voltage vin rising edge,
Electrical parameter signal Vcs failing edge is the reference voltage average value terminated in an identified sampling period.
The circuit for detecting input voltage and the second electrical parameter signal embodiment is as shown in figure 16, silicon-controlled in Figure 16 to cut wave angle
Spending detection circuit 60 includes second operational amplifier U2, third operational amplifier U3, the first pulse-generating circuit A1, the second pulse
The positive input of generation circuit A2, rest-set flip-flop and sample integration circuit 61, the second operational amplifier U2 connects input
Voltage sampling signal Vdect, the reverse input end of second operational amplifier U2 connect for providing rising edge acquisition initiation threshold
6th threshold value, the reverse input end of third operational amplifier U3 meet the second electrical parameter signal Vcs, and third operational amplifier U3 is just
The 7th threshold value for terminating threshold value for providing failing edge acquisition to input termination, second operational amplifier U2 and third operation amplifier
The output of device U3 connects the input of the first pulse-generating circuit A1 and the second pulse-generating circuit A2 respectively, and first pulse produces
The output of raw circuit A1 and the second pulse-generating circuit A2 connects the end S of rest-set flip-flop respectively and the end R, impulse circuit detect operation
To rest-set flip-flop input pulse signal when the energizing signal that amplifier generates, the output of rest-set flip-flop is connected with sample integration circuit
It connects, and connects reference voltage on sample integration circuit.Specifically, when detecting that input voltage vin reaches rising edge threshold value
Two operational amplifier U2 generate the first energizing signal X1, the first pulse-generating circuit A1 and detect that the first energizing signal X1 is touched to RS
It sends out device and inputs the first pulse signal Y1, similarly, third is transported when detecting that the second electrical parameter signal Vcs reaches failing edge threshold value
It calculates amplifier U3 the second energizing signal of generation X2, the second pulse-generating circuit A2 and detects that the second energizing signal X2 is triggered to RS
Device inputs the second pulse signal Y2.Further by the waveform of Figure 16 and Figure 17 it is found that the end Q and the end Q of rest-set flip-flop respectively with adopt
The control terminal of two switches is connected in sample integrating circuit 61, connects another termination of reference voltage on two switch one end being arranged in series
Ground, two public termination integrating resistors of switch, is additionally provided with integrating capacitor between integrating resistor and ground.Rest-set flip-flop is according to input electricity
Pressure Vin reaches rising edge time and the second electrical parameter signal Vcs reaches filling for failing edge moment control sample integration circuit 61
Discharge time obtains characterizing silicon-controlled the first electrical parameter signal Vout for cutting wave angle degree in turn.The output termination of sample integration circuit 61
Leakage current control circuit 70 is used to the first electrical parameter signal Vout after calculation process inputting leakage current control circuit 70.
Fig. 8 illustrates a kind of a kind of structure of leakage current control circuit 70, which stresses solving LED circuit
Leakage current control after 30 conductings, it is, of course, also possible to take other forms or increasingly complex circuit.Vent discharge flow control
Circuit 70 processed includes the first comparison amplifier being compared to the first threshold and the first electrical parameter signal, to third threshold value
The second comparison amplifier being compared with electrical parameter signal Vcs.Leakage current control circuit 70 can also include logic gate electricity
Road (be illustrated as in figure and door) controls leakage current according to the comparison result of the first comparison amplifier and the second comparison amplifier
Circuit 20.The output end of two comparison amplifiers is all connected on two input terminals with door in the circuit, wherein first compares
The positive input of amplifier inputs first threshold, and reverse input end connects electrical parameter signal Vout, the second comparison amplifier
Positive input input third threshold value, reverse input end input electrical parameter signal Vcs；It is exported with door according to two comparators
Level controls the switching of leakage current circuit 20.
When electrical parameter signal Vout is greater than first threshold, it is meant that the starting angle of flow is small, the output of the first comparison amplifier
Low level stops providing leakage current at this time with the conducting of door shutdown leakage current circuit 20；When electrical parameter signal Vout is less than
When first threshold, it is meant that the starting angle of flow is big, and the first comparison amplifier exports high level, and when electrical parameter signal Vcs is greater than
When third threshold value, the second comparison amplifier exports low level, at this time with the conducting of door shutdown leakage current circuit 20, stops providing
Leakage current；When electrical parameter signal Vout is less than first threshold, the first comparison amplifier exports high level, and when electrical parameter is believed
When number Vcs is less than third threshold value, the second comparison amplifier exports high level, opens leading for leakage current circuit 20 with door at this time
It is logical, leakage current is provided.
Optionally, if after controllable silicon dimmer 10 is connected, the received electrical parameter signal of leakage current control circuit 70
When Vcs is consistently less than third threshold value, even if electrical parameter signal Vout is greater than first threshold, leakage current control circuit 70 is opened always
The leakage current circuit 20 is opened, to provide leakage current.
Optionally, NMOS tube used in leakage current circuit 20 can be the switching tubes such as NPN/PNP and PMOS.
In above-mentioned Dimmable LED driving circuit, electrical parameter signal is exported by silicon-controlled wave angle detection circuitry 60 of cutting
After Vout, when leakage current control circuit 70 compares electrical parameter signal Vout greater than first threshold, leakage current circuit 20 is controlled
Stop providing leakage current, the working efficiency of Lai Tigao system；When electrical parameter signal Vout is less than first threshold and electrical parameter letter
When number Vcs is less than third threshold value, control leakage current circuit 20 provides leakage current again, to guarantee the stability of system.
For in the Dimmable LED driving circuit of Alternating Current Power Supply, controllable silicon dimmer 10 cuts the crest voltage inputted after wave
The close output LED light voltage V of Vin_pkLED(Vin_pk-V when a certain rangeLED< △ V), controllable silicon dimmer 10 cuts wave appearance
Serious asymmetry, causes flashing light；And if controllable silicon dimmer 10 cuts the crest voltage Vin_pk inputted after wave and LED light
Voltage VLEDDifference be more than or equal to the range (Vin_pk-VLED>=△ V), then controllable silicon dimmer 10 would not occur this tight
Flashing light, would not also occur in weight asymmetry.So the input crest voltage Vin_pk after controllable silicon dimmer 10 cuts wave
With LED light voltage VLEDDifference be more than or equal to the range (Vin_pk-VLED>=△ V) when just by LED current drop to zero or
Lower value, then the problem of can solve or improve flashing light.
To solve the above-mentioned problems, the utility model cuts wave angle detection circuitry 60 and power control circuit 40 silicon-controlled
Between increase an output current compensation circuit 80, and the input terminal of power control circuit 40 is changed to and to export current compensation electric
The output end on road 80 connects.The of the silicon-controlled output end connection output current compensation circuit 80 for cutting wave angle detection circuitry 60
One input terminal.
The silicon-controlled electrical parameter signal for cutting the output of wave angle detection circuitry 60 is received in output current compensation circuit 80
When Vout, according to its internal second threshold being arranged, electrical parameter signal Vout is compared with second threshold.When electrical parameter is believed
Number Vout is less than second threshold, it is meant that cutting the crest voltage inputted after wave may be close to output LED light voltage VLEDCertain model
It encloses, the electric current that output current compensation circuit 80 controls LED circuit 30 is gradually reduced；Electrical parameter signal Vout is smaller, then exports electricity
The amplitude for flowing the electric current of the adjustment control LED circuit 30 of compensation circuit 80 is bigger, until Vin_pk-VLEDWhen >=△ V, electric current is exported
The peak point current of LED circuit 30 is reduced to zero by compensation circuit, or is reduced to a smaller value, at this point, flashing light or can be solved very much
Improve flashing light in big degree.
Preferably, the reverse input end of power control circuit 40 is changed to connect with the output end of output current compensation circuit 80
It connects, realizes the descending slope for controlling Ics peak point current by power control circuit 40.
Preferably, 70 second input terminal of leakage current control circuit is connected among metal-oxide-semiconductor 50 and sampling resistor Rcs, real
Existing 70 real-time detection electrical parameter signal Vcs of leakage current control circuit, when electrical parameter signal Vcs is less than its internal third being arranged
When threshold value, leakage current circuit 20 provides always electric current, to maintain controllable silicon dimmer 10 to be connected.
Wherein, Ics peak point current indicates the output electric current for passing through sampling resistor Rcs, and electrical parameter signal Vcs characterization flows through
The electric current of LED circuit (30), and Vcs=Ics*Rcs.
In one embodiment, three kinds of controllable silicon dimmers 10 of the offer as shown in Fig. 9 A, 9B and 9C cut wave angle degree, Ics
Electric current and ILEDThe relationship of electric current.It is respectively θ 1, θ 2 and θ 3 that controllable silicon dimmer 10 in Fig. 9 A, 9B and 9C, which cuts wave angle, θ, is cut
The crest voltage inputted after wave is respectively Vin_pk1 ', Vin_pk2 ', VLED+△V.And 2 < θ of wave 1 < θ of angle, θ 3 is cut, after cutting wave
Input crest voltage Vin_pk1 ' > Vin_pk2 ' > VLED+△V。
When silicon-controlled wave angle detection circuitry 60 of cutting detects that the wave angle, θ of cutting of controllable silicon dimmer 10 reaches second threshold
When set θ 1 (when as shown in Figure 9 A, cutting wave angle, θ less than or equal to θ 1, Ics peak point current perseverance is Ipk1), output electricity
Stream compensation circuit 80 starts to reduce the peak point current of Ics, and with the gradually increasing for cutting wave angle, θ of controllable silicon dimmer 10
Greatly, the peak point current of Ics continues to decline (as shown in Figure 9 B, Ics peak point current drops to Ipk2, Ipk2 < Ipk1), at this time LED
Electric current also with Ics peak point current decline and decline；When silicon-controlled wave angle detection circuitry 60 of cutting detects thyristor regulating
The starting of light device 10 cut wave angle, θ increase to θ 3 (as shown in Figure 9 C, controllable silicon dimmer 10 cuts the peak value inputted after wave at this time
Voltage VLED+ △ V) when, the peak point current of Ics can be dropped to zero by output current compensation circuit 80.If the peak point current of Ics
LED conducting voltage V is still greater than in input voltage vinLEDIt is reduced to zero before, then can solve the problems, such as flashing light；If the peak value electricity of Ics
Stream is less than LED conducting voltage V in input voltage vinLEDIt is reduced to smaller value later, then can largely improve low-angle flashing light
Problem.
In one embodiment, the silicon-controlled wave angle detection circuitry 60 of cutting provided as shown in Figure 10 reduces the peak value of Ics
Corresponding leakage current when electric current, when the peak point current of Ics starts to be gradually reduced, 70 real-time detection of leakage current control circuit
Electrical parameter signal VCS, as electrical parameter signal VCSAfter third threshold value, leakage current circuit 20 provides always electric current, to maintain
The conducting of controllable silicon dimmer 10.
In the one embodiment for solving the problems, such as flashing light, as shown in figure 11, the utility model proposes a kind of output electric currents
Compensation circuit 80, including the first trsanscondutance amplifier GM and compensation resistance Rcomp.The first trsanscondutance amplifier output end is logical in the circuit
The diode and compensation resistance Rcomp of crossing one-way conduction are connected to the drain electrode of metal-oxide-semiconductor, and positive input inputs second threshold,
Reverse input end is coupled to receive the silicon-controlled electrical parameter signal Vout for cutting the generation of wave angle detection circuitry 60.
Output current compensation circuit 80 detects the electrical parameter signal Vout for being input to the first trsanscondutance amplifier reverse input end
Voltage value.If the voltage value of electrical parameter signal Vout is reduced to second threshold, the output end of the first trsanscondutance amplifier is opened
Begin to export a compensation electric current Icomp, compensation electric current Icomp can generate an offset voltage on compensation resistance Rcomp
Vcomp (Vcomp=Icomp × Rcomp), to reduce the peak point current of Ics.If electrical parameter signal Vout continues to reduce,
It then compensates electric current Icomp to be gradually increased, Ics peak point current is gradually reduced, and LED current is also gradually reduced.If electrical parameter signal
Vout be reduced to a certain set amount (namely cut in Fig. 9 C wave angle degree be 3 degree of θ, controllable silicon dimmer 10 cuts the peak value inputted after wave
Voltage is VLED+ △ V), offset voltage Vcomp increase to when VREF is equal in power control circuit 40, the peak point current of Ics
Zero is dropped to, the electric current on LED circuit 30 also drops to zero, so that controllable silicon dimmer 10 will before not occurring serious asymmetry
LED current drops to zero, solves the problems, such as flashing light to realize.
In the one embodiment for improving low-angle flashing light problem, as shown in figure 12, the utility model proposes another kinds
Export current compensation circuit 80, including the first trsanscondutance amplifier, the second trsanscondutance amplifier and compensation resistance Rcomp.First mutual conductance
Amplifier positive input inputs second threshold, and reverse input end and the connection of the second trsanscondutance amplifier positive input are to receive
Electrical parameter signal Vout, the second trsanscondutance amplifier reverse input end input the 4th threshold value；The output end of first trsanscondutance amplifier GM1
After the diode of one unidirectional (outbound course) conducting, the output end of the second trsanscondutance amplifier GM2 is through another opposite direction
It after the diode of (input direction) one-way conduction, is coupled, then compensated resistance Rcomp is coupled to the leakage of metal-oxide-semiconductor 50
Pole；Wherein second threshold is greater than the 4th threshold value.After electrical parameter signal Vout drops to four threshold values, the second trsanscondutance amplifier is opened
The output electric current of the first trsanscondutance amplifier of beginning limitation, so that Ics is limited in a smaller value, to realize largely
Improve low-angle flashing light problem.
Optionally, first threshold mentioned above, second threshold, third threshold value and the 4th threshold value can for current threshold,
Either threshold in voltage threshold, time threshold etc., the utility model are most preferably voltage threshold, followed by time threshold
Value.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or device including a series of elements are not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or device
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or device including the element.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
Determine the protection scope of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (13)
1. a kind of Dimmable LED driving circuit, comprising: controllable silicon dimmer (10), leakage current circuit (20), LED circuit
(30)；The leakage current circuit (20) is provided when input voltage (Vin) is not up to the conducting voltage of the LED circuit (30)
Electric current needed for the controllable silicon dimmer (10)；It is characterized by further comprising: it is silicon-controlled cut wave angle detection circuitry (60) and
Leakage current control circuit (70)；
After the controllable silicon dimmer (10) conducting, described silicon-controlled cut wave angle detection circuitry (60) obtain that characterization is silicon-controlled to cut
First electrical parameter signal (Vout) of wave angle degree；
The first electrical parameter signal (Vout) is compared by the leakage current control circuit (70) with first threshold, to control
Make the leakage current circuit (20).
2. Dimmable LED driving circuit according to claim 1, which is characterized in that the leakage current control circuit
(70) it is detecting that the first electrical parameter signal (Vout) is greater than first threshold, is controlling the leakage current circuit (20) and close
It is disconnected, stop providing leakage current.
3. Dimmable LED driving circuit according to claim 1, which is characterized in that the leakage current control circuit
(70) the second electrical parameter (Vcs) that characterization flows through the LED circuit (30) electric current is compared with third threshold value, when described
One electrical parameter signal (Vout) is less than the first threshold and the second electrical parameter signal (Vcs) is less than the third threshold value
When, the leakage current control circuit (70) controls the leakage current circuit (20) and opens, and provides leakage current.
4. Dimmable LED driving circuit according to claim 1, which is characterized in that the first electrical parameter signal
(Vout) correspond to input voltage (Vin) and cut wave angle degree from the starting of the controllable silicon dimmer (10) conducting in one cycle
Start to the average value during end cycle.
5. Dimmable LED driving circuit according to claim 1, which is characterized in that the silicon-controlled wave angle degree of cutting detects
Circuit (60) includes integrating circuit, and the integrating circuit is used to integrate input voltage (Vin), to provide the first electricity ginseng
Number signal (Vout).
6. Dimmable LED driving circuit according to claim 1, which is characterized in that further include: output current compensation circuit
(80), the first electrical parameter signal (Vout) is compared by the output current compensation circuit (80) with second threshold, comes
The electric current of the LED circuit (30) is flowed through in control；Wherein, second threshold is less than first threshold and shows that controllable silicon dimmer is cut
Conducting voltage (V of the crest voltage of input voltage after wave close to LED circuitLED)。
7. Dimmable LED driving circuit according to claim 6, which is characterized in that the output current compensation circuit
It (80) include the first trsanscondutance amplifier；First trsanscondutance amplifier is used to be less than described the in the first electrical parameter signal (Vout)
When two threshold values, the output current compensation circuit (80) exports electric current, to reduce the peak point current for the electric current for flowing through LED circuit.
8. Dimmable LED driving circuit according to claim 7, which is characterized in that the output current compensation circuit
It (80) further include the second trsanscondutance amplifier；Second trsanscondutance amplifier is used in the first electrical parameter signal (Vout) less than the 4th
When threshold value, the output electric current of first trsanscondutance amplifier is limited；Wherein the second threshold is greater than the 4th threshold value.
9. Dimmable LED driving circuit according to claim 2, which is characterized in that the leakage current control circuit
It (70) include that the first comparison amplifier is compared the first threshold and the first electrical parameter signal (Vout)；Second compares and puts
Big device is compared third threshold value and the second electrical parameter signal (Vcs).
10. Dimmable LED driving circuit according to claim 1, which is characterized in that leakage current circuit (20) packet
Include current source and switching circuit；The current source is connected with the switching circuit in series, and the switching circuit is in the vent discharge
Release under the control of flow control circuit (70) unlatching or shutdown of releasing.
11. Dimmable LED driving circuit according to claim 1, which is characterized in that the first electrical parameter signal
(Vout) correspond to the reference voltage average value in a second electrical parameter signal (Vcs) in the sampling period, the second electricity ginseng
Number signal (Vcs) characterization flows through the electric current of the LED circuit (30).
12. Dimmable LED driving circuit according to claim 11, which is characterized in that the silicon-controlled wave angle degree of cutting is examined
Slowdown monitoring circuit (60) includes the first operational amplifier U1 and sample integration circuit (61), and the forward direction of the first operational amplifier U1 is defeated
Enter the second electrical parameter signal (Vcs) of termination, the reverse input end of the first operational amplifier U1 connects the 5th threshold value, the first operation amplifier
The output end of device U1 is connected with sample integration circuit (61), and connects reference voltage, sample integration on sample integration circuit (61)
Output termination leakage current control circuit (70) of circuit (61) is used for the first electrical parameter signal (Vout) after calculation process
It inputs leakage current control circuit (70).
13. Dimmable LED driving circuit according to claim 1, which is characterized in that the first electrical parameter signal
(Vout) correspond to input voltage (Vin) rising edge for beginning and with the second electrical parameter signal (Vcs) failing edge for end institute
Reference voltage average value in a determining sampling period, the second electrical parameter signal (Vcs) characterization flow through the LED electricity
The electric current on road (30).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820887830 | 2018-06-08 | ||
| CN2018208878304 | 2018-06-08 | ||
| CN201820934366 | 2018-06-15 | ||
| CN201820934366X | 2018-06-15 |
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| CN208863094U true CN208863094U (en) | 2019-05-14 |
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| CN201821172528.7U Withdrawn - After Issue CN208863094U (en) | 2018-06-08 | 2018-07-23 | A kind of Dimmable LED driving circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191543A (en) * | 2019-06-24 | 2019-08-30 | 杰华特微电子（杭州）有限公司 | Leadage circuit and its control method and the LED control circuit for applying it |
| WO2019233489A1 (en) * | 2018-06-08 | 2019-12-12 | 美芯晟科技（北京）有限公司 | Dimmable led driving circuit and control method |
| CN110582136A (en) * | 2018-06-08 | 2019-12-17 | 美芯晟科技（北京）有限公司 | Dimmable LED drive circuit and control method |
| CN110602820A (en) * | 2019-08-09 | 2019-12-20 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| TWI730425B (en) * | 2019-09-25 | 2021-06-11 | 大陸商漳州立達信光電子科技有限公司 | Led quick start system without voltage detection |
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2018
- 2018-07-23 CN CN201821172528.7U patent/CN208863094U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019233489A1 (en) * | 2018-06-08 | 2019-12-12 | 美芯晟科技（北京）有限公司 | Dimmable led driving circuit and control method |
| CN110582136A (en) * | 2018-06-08 | 2019-12-17 | 美芯晟科技（北京）有限公司 | Dimmable LED drive circuit and control method |
| US11071179B2 (en) | 2018-06-08 | 2021-07-20 | Maxic Technology Corporation | Dimmable LED drive circuit and control method thereof |
| CN110582136B (en) * | 2018-06-08 | 2024-08-02 | 美芯晟科技(北京)股份有限公司 | Dimmable LED driving circuit and control method |
| CN110191543A (en) * | 2019-06-24 | 2019-08-30 | 杰华特微电子（杭州）有限公司 | Leadage circuit and its control method and the LED control circuit for applying it |
| CN110602820A (en) * | 2019-08-09 | 2019-12-20 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| CN110602820B (en) * | 2019-08-09 | 2022-01-11 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| TWI730425B (en) * | 2019-09-25 | 2021-06-11 | 大陸商漳州立達信光電子科技有限公司 | Led quick start system without voltage detection |
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Address after: Room 01, 10 / F, block a, Tiangong building, Keda, 30 Xueyuan Road, Haidian District, Beijing 100089 Patentee after: Meixinsheng Technology (Beijing) Co.,Ltd. Address before: 100191 10th floor, block a, Tiangong building, HKUST, 30 Xueyuan Road, Haidian District, Beijing Patentee before: MAXIC TECHNOLOGY (BEIJING) Co.,Ltd. |
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