CN109302775A - A kind of LED drive system of centrally connected power supply formula - Google Patents
A kind of LED drive system of centrally connected power supply formula Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
This application discloses a kind of LED drive systems of centrally connected power supply formula, comprising: AC-DC module, the coupling module for receiving pwm signal and N number of current stabilization module that can solve decoupling pwm signal and electric current is exported using pwm signal adjustment LED load；N≥2；Wherein, the input terminal of AC-DC module connects AC power source, first output end of AC-DC module and the first output end of coupling module connect, the second output terminal of coupling module and the second output terminal of AC-DC module are connect with the input terminal of N number of current stabilization module respectively, and the output end of N number of current stabilization module is connect with N number of LED load respectively.The network complexity of light adjusting system can be reduced by the LED drive system in the application.
Description
Technical field
The present invention relates to control field, in particular to a kind of LED drive system of centrally connected power supply formula.
Background technique
LED (Light Emitting Diode, light emitting diode) because of it with energy conservation and environmental protection, long service life, be easy to
The advantages that control, and become a research hotspot of lighting area.Concentration supply power refers to different LED lamps by same
Power supply driving power supply, to reduce the cost of LED drive power.In concentration supply power system, it usually needs to LED into
Row light modulation, to save the power consumption values of LED drive power.But conventional PWM light adjusting system there are routes more, wiring complexity etc.
Problem, it can be seen that, how to provide a kind of better LED drive system to reduce the network complexity of LED drive system is
Those skilled in the art's urgent problem to be solved.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of LED drive system of centrally connected power supply formula, to reduce LED drive
Network complexity in dynamic system.Its concrete scheme is as follows:
A kind of LED drive system of centrally connected power supply formula, comprising:
AC-DC module, the coupling module for receiving pwm signal and N number of it can solve pwm signal and utilization described in decoupling
The current stabilization module of the pwm signal adjustment LED load output electric current；N≥2；
Wherein, the input terminal of the AC-DC module connects AC power source, the first output end of the AC-DC module and institute
State the first output end connection of coupling module, the second output of the second output terminal of the coupling module and the AC-DC module
End is connect with the input terminal of N number of current stabilization module respectively, and the output end of N number of current stabilization module is negative with N number of LED respectively
Carry connection.
Preferably, the coupling module includes the first transformer；
Wherein, the primary side of first transformer is for receiving the pwm signal；
The first end of first transformer secondary is the first output end of the coupling module, the first transformer pair
The second end on side is the second output terminal of the coupling module.
Preferably, further includes: the first block isolating circuit；
Wherein, first block isolating circuit is connected with the primary side of first transformer.
Preferably, the current stabilization module includes:
For solving the decoupling circuit of pwm signal described in decoupling and for adjusting the LED load according to the pwm signal
Export the constant-current circuit of electric current；
Wherein, the output end of the decoupling circuit is connect with the control terminal of the constant-current circuit；
The input terminal of the input terminal of the decoupling circuit and the constant-current circuit collectively forms the input of the current stabilization module
End, the output end of the constant-current circuit are the output end of the current stabilization module.
Preferably, the decoupling circuit includes the second block isolating circuit and the second transformer；
Wherein, one end of the block isolating circuit is connect with the first end of second transformer primary side；
The second end of the other end of second block isolating circuit and second transformer primary side collectively forms the decoupling
The input terminal of circuit, the secondary side of second transformer are the output end of the decoupling circuit.
Preferably, further includes: for converting the pwm signal to the conversion circuit of analog signal；
Wherein, the input terminal of the conversion circuit is connect with the output end of the decoupling circuit, the conversion circuit it is defeated
Outlet is connect with the control terminal of the constant-current circuit.
Preferably, the constant-current circuit is specially DC/DC translation circuit or linear circuit.
Preferably, when the constant-current circuit is the DC/DC translation circuit, the DC/DC translation circuit includes DC/DC
The control circuit of circuit, current loop circuit and the amplitude for adjusting the current loop circuit output electric current；
Wherein, the output end of the DC/DC circuit is connect with the test side of the current loop circuit, the current loop circuit
Output end connect with the input terminal of the control circuit, the control of the output end of the control circuit and the DC/DC circuit
End connection；
The control terminal of the DC/DC circuit is the input terminal of the constant-current circuit, and the output end of the DC/DC circuit is institute
The output end of constant-current circuit is stated, the input terminal of the current loop circuit is the control terminal of the constant-current circuit.
Preferably, when the constant-current circuit is the linear circuit, the linear circuit includes adjustment pipe and current limliting electricity
Road；
Wherein, the control terminal of the adjustment pipe is connect with the output end of the current-limiting circuit, the current-limiting control circuit
Test side is connect with one end of the adjustment pipe；
The other end of the adjustment pipe is the input terminal of the constant-current circuit, and the input terminal of the current-limiting control circuit is institute
State the control terminal of constant-current circuit；
Correspondingly, the second output terminal of the coupling module is connected with one end of the LED load, the one of the adjustment pipe
End is also connected with the other end of the LED load.
Preferably, the current-limiting circuit includes amplifier, first resistor and second resistance；
Wherein, the negative-phase input of the amplifier respectively with the first end of the first resistor and the second resistance
One end connection, the positive input of the amplifier is for receiving reference signal；
The output end of the amplifier is the input terminal of the current-limiting circuit, and the second end of the second resistance is the current limliting
The test side of circuit, the second end of the first resistor are the output end of the current-limiting circuit.
As it can be seen that being that the alternating voltage that AC power source exports is converted to direct current by AD/DC module first in the present invention
Voltage, and DC voltage is input to coupling module, at this point, pwm signal and AD/DC that coupling module can send user
The DC voltage of module output carries out coupling superposition, and will couple superimposed signal and be input to N number of current stabilization module, at this point, N number of
Current stabilization module will will couple superimposed signal and be converted to the DC current of amplitude stability, and from coupling in superimposed signal
Pwm signal is decoupled, then, the pwm signal that decoupling obtains is input in N number of LED load, and is achieved in negative to N number of LED
The light modulation of load.Obviously, compared with the prior art, conventional PWM can be reduced by coupling module and decoupling module in the present invention
A large amount of connection line in dimming mode, and thus reduce the network complexity in LED drive system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the LED drive system for centrally connected power supply formula that the embodiment of the present invention one provides；
Fig. 2 is a kind of structural schematic diagram of the LED drive system of centrally connected power supply formula provided by Embodiment 2 of the present invention；
Fig. 3 is a kind of structural schematic diagram of the LED drive system for centrally connected power supply formula that the embodiment of the present invention three provides；
Fig. 4 is the Vbus schematic diagram that the embodiment of the present invention three provides；
Fig. 5 is structural schematic diagram when first block isolating circuit is capacitor in the embodiment of the present invention three；
Fig. 6 is a kind of structural schematic diagram of the LED drive system for centrally connected power supply formula that the embodiment of the present invention four provides；
Fig. 7 is structural schematic diagram when second block isolating circuit is capacitor in the embodiment of the present invention four；
Fig. 8 is the structural schematic diagram of the LED drive system for the centrally connected power supply formula that the embodiment of the present invention six provides；
Fig. 9 is a kind of structural schematic diagram of the LED drive system for centrally connected power supply formula that the embodiment of the present invention seven provides；
Figure 10 is a kind of structural schematic diagram of the LED drive system for centrally connected power supply formula that the embodiment of the present invention eight provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention one discloses a kind of LED drive system of centrally connected power supply formula, as shown in Figure 1, LED driving system
System includes:
AC-DC module, the coupling module for receiving pwm signal and N number of it can solve decoupling pwm signal and using PWM
Signal adjusts the current stabilization module of LED load output electric current；N≥2；
Wherein, the input terminal of AC-DC module connects AC power source, the first output end of AC-DC module and coupling module
The second output terminal of the connection of first output end, the second output terminal of coupling module and AC-DC module respectively with N number of current stabilization module
Input terminal connection, the output end of N number of current stabilization module are connect with N number of LED load respectively.
Compared to traditional lighting method, LED illumination has many advantages, such as high photosynthetic efficiency, service life length and energy conservation and environmental protection, and becomes
A research hotspot in lighting area.Wherein, PWM light regulating technology can be by changing high level and low electricity in pwm signal
Flat duty ratio carrys out any opening time for changing LED load, to achieve the purpose that adjust LED load brightness.
It in the present embodiment, is by AC-DC module first by input in order to reach the centralized control to LED load
Alternating voltage is converted to DC voltage, then, pwm signal and the AC-DC module output for being sent user using coupling module
DC voltage carries out coupling superposition, later, is converted to the signal of coupling superposition by N number of current stabilization module with decoupling function
The DC current of amplitude stability, and pwm signal is decoupled from the signal of coupling superposition, as current stabilization module solution decoupling PWM
When signal, current stabilization module can carry out brightness adjustment control to N number of LED load using pwm signal.
In addition, LED drive system provided by the present embodiment, is to be supplied by the same power supply N number of LED load
Electricity can not only reduce a large amount of connection circuitry in LED drive system, but also can subtract significantly by such power supply mode
The design cost of few LED drive power；Meanwhile pwm signal is adjusted by way of coupling and decoupling as dim signal
Light not only eliminates multiple light modulation lines in central power supply system, and also avoid the wiring complexity between light modulation line and
Problem is interfered with each other between each light modulation line.
It should be noted that in the present embodiment, the first output end of AC-DC module can be the output of AC-DC module
Anode is also possible to the output negative terminal of AC-DC module, that is, the first output end of coupling module can connect in AC-DC module
Output plus terminal, also can connect the output negative terminal in AC-DC module.Moreover, can reach to pwm signal and DC voltage into
The circuit structure of the coupling module of row coupling superposition is varied, such as: direct-coupling, resistance-capacitance coupling, rheostat coupling etc.,
So in the present embodiment, not limited specifically for the circuit structure in coupling module, similarly, the present embodiment is for steady
Circuit structure in flow module does not also limit specifically, as long as can reach practical application purpose.
As it can be seen that being to be converted to the alternating voltage that AC power source exports directly by AD/DC module first in the present embodiment
Galvanic electricity pressure, and DC voltage is input to coupling module, at this point, pwm signal and AD/ that coupling module can send user
The DC voltage of DC module output carries out coupling superposition, and will couple superimposed signal and be input to N number of current stabilization module, at this point, N
A current stabilization module will will couple superimposed signal and be converted to the DC current of amplitude stability, and from coupling superimposed signal
Then the pwm signal that decoupling obtains is input in N number of LED load, and be achieved in N number of LED by middle decoupling pwm signal
The light modulation of load.Obviously, compared with the prior art, routine can be reduced by coupling module and decoupling module in the present embodiment
A large amount of connection line in PWM dimming mode, and thus reduce the network complexity in LED drive system.
On the basis of embodiment 1, embodiment two is further described and optimizes to technical solution, such as Fig. 2 institute
Show, specifically, above-mentioned coupling module includes the first transformer T1；
Wherein, the primary side of the first transformer T1 is for receiving pwm signal；
The first end on the first transformer T1 pair side be coupling module the first output end, the second of the first transformer T1 pair side
End is the second output terminal of coupling module.
As shown in Fig. 2, being a kind of concrete structure diagram of coupling module provided in this embodiment.In Fig. 2, the first transformation
The primary side of device T1 is used to receive the pwm signal of user's transmission, and the secondary side of the first transformer T1 is used to receive AC-DC module output
DC voltage, thus one, pwm signal and DC voltage can be carried out coupling superposition by the first transformer T1.
On the basis of example 2, embodiment three is further described and optimizes to technical solution, as shown in figure 3,
As a preferred embodiment, coupling module further include: the first block isolating circuit；
Wherein, the first block isolating circuit is connected with the primary side of the first transformer T1.
In order to avoid the influence that the DC component in pwm signal transmits signal, in the present embodiment, be using first every
Straight circuit is isolated by the DC component in pwm signal, and the first transformer T1 is made only to transmit the AC compounent in pwm signal,
That is, pwm signal V1, then, the first transformer T1 pair side connect with the DC voltage that AC-DC module exports, make pwm signal
The DC voltage that AC compounent V1 is exported with AC-DC module is superimposed, and obtains the voltage Vbus of DC bus, wherein electricity
Press Vbus as shown in figure 4, there is the pwm signal V1 of exchange as ripple signal on voltage Vbus.
In addition, as a preferred embodiment, capacitor can be set by the first block isolating circuit, as shown in Figure 5.?
That is, the flip-flop in pwm signal is isolated using capacitor C1, so that coupling circuit only export the PWM letter of exchange
Number V1.
On the basis of embodiment two, example IV is further described and optimizes to technical solution, such as Fig. 6 institute
Show, specifically, current stabilization module includes:
Perseverance for solving the decoupling circuit of decoupling pwm signal and for adjusting LED load output electric current according to pwm signal
Current circuit；
Wherein, the control terminal of the output end of decoupling circuit and constant-current circuit connects；
The input terminal of decoupling circuit and the input terminal of constant-current circuit collectively form the input terminal of current stabilization module, constant-current circuit
Output end is the output end of current stabilization module.
In order to which current stabilization module can be achieved the purpose that decouple DC bus-bar voltage Vbus, in the present embodiment,
There is provided a kind of structural schematic diagrams of current stabilization module with decoupling function, as shown in Figure 6.In the present embodiment, decoupling electricity
For separating the pwm signal in DC bus-bar voltage Vbus, constant-current circuit is used to turn DC bus-bar voltage Vbus on road
It is changed to the DC current flow of amplitude stability, to provide LED load stable supply current, and the PWM letter obtained by decoupling
Number to LED load carry out brightness adjustment control.
As shown in fig. 6, as a preferred embodiment, decoupling circuit includes: the second block isolating circuit and the second transformation
Device T2；
Wherein, one end of block isolating circuit is connect with the first end of the second transformer T2 primary side；
The second end of the other end of second block isolating circuit and the second transformer T2 primary side collectively forms the input of decoupling circuit
End, the secondary side of the second transformer T2 are the output end of decoupling circuit.
In the present embodiment, the effect of the second block isolating circuit be for DC bus-bar voltage carry out blocking processing, then,
Pwm signal is separated from DC bus-bar voltage, and pwm signal is input in constant-current circuit, so that constant-current circuit can be with
Brightness adjustment control is carried out to LED load.As shown in fig. 7, in practical application capacitor can be set by the second block isolating circuit.
As shown in fig. 7, as a preferred embodiment, the LED drive system of the centrally connected power supply formula further include: be used for
Convert pwm signal to the conversion circuit of analog signal；
Wherein, the output end of the input terminal of conversion circuit and decoupling circuit connects, the output end and Constant Electric Current of conversion circuit
The control terminal on road connects.
In the present embodiment, in order to enable the LED drive system in the application can be applied to more actual scenes, also
The conversion circuit for pwm signal to be converted to analog signal is provided between decoupling circuit and constant-current circuit, so,
The pwm signal that decoupling circuit can be decoupled out by conversion circuit is converted into analog signal Dim, also, by analog signal
The amplitude of Dim be set as with the duty ratio of pwm signal at certain proportionate relationship after, so that it may so that supplying LED load
The supply current of electricity changes with the variation of Dim signal, further improves carry out brightness adjustment control to LED load as a result,
Stability.
On the basis of example IV, embodiment five is further described and optimizes to technical solution, constant-current circuit
Specially DC/DC translation circuit or linear circuit.
It is understood that the main function of constant-current circuit is for inputting steady dc voltage to LED load, in reality
In the application of border, it can use DC/DC translation circuit to realize the function, can use linear circuit also to realize the function,
It is either realized by other circuit structures, is not limited specifically herein.
On the basis of embodiment five, embodiment six is further described and optimizes to technical solution, as shown in figure 8,
Specifically, DC/DC translation circuit includes DC/DC circuit, current loop circuit and use when constant-current circuit is DC/DC translation circuit
In the control circuit of the amplitude of adjustment current loop circuit output electric current；
Wherein, the test side of the output end of DC/DC circuit and current loop circuit connects, the output end of current loop circuit and control
The input terminal of circuit processed connects, and the output end of control circuit is connect with the control terminal of DC/DC circuit；
The control terminal of DC/DC circuit is the input terminal of constant-current circuit, and the output end of DC/DC circuit is the output of constant-current circuit
End, the input terminal of current loop circuit are the control terminal of constant-current circuit.
In the present embodiment, the effect of DC/DC circuit is that DC bus-bar voltage is converted to DC current Io, and electric current loop
The effect of circuit be by the amplitude stability of DC current Io within a fixed range.Obviously, in this way, DC/
DC bus-bar voltage can be converted to the DC current of amplitude stability by DC translation circuit.
Wherein, current loop circuit includes test side, input terminal and output end, and test side is used to detect the defeated of DC/DC circuit
Current signal Io out, input terminal can be used to receive the reference signal of reference voltage source generation.So, when pwm signal is defeated
When entering to electric current loop, the amplitude of current loop circuit control output electric current can change with the variation of pwm signal, and
It is achieved in the brightness adjustment control to LED load.
Alternatively, brightness adjustment control is carried out to LED load by chip, that is, by chip also according to the needs of actual conditions
It is equivalent to a control circuit, when pwm signal is input to the dimming interface of control circuit, so that it may control by control circuit
The amplitude of output electric current changes with the variation of pwm signal, and is achieved in the brightness adjustment control to LED load.
Alternatively, pwm signal can also be converted into analog signal Dim by conversion circuit, then, analog signal Dim was both
The input terminal of current loop circuit can be acted on, the test side of current loop circuit can also be acted on, also may be implemented in this way pair
The brightness adjustment control of LED load, it is clear that by such set-up mode, LED information display system provided by the present application can be made to be suitable for more
Practical application scene.
On the basis of embodiment five, embodiment seven is further described and optimizes to technical solution, as shown in figure 9,
Specifically, linear circuit includes adjustment pipe and current-limiting circuit when constant-current circuit is linear circuit；
Wherein, the output end of the control terminal and current-limiting circuit that adjust pipe connects, the test side of current-limiting control circuit and adjustment
One end of pipe connects；
The other end for adjusting pipe is the input terminal of constant-current circuit, and the input terminal of current-limiting control circuit is the control of constant-current circuit
End；
Correspondingly, the second output terminal of coupling module is connected with one end of LED load, the one end for adjusting pipe is also negative with LED
The other end of load is connected.
In the present embodiment, current-limiting control circuit is mainly used to the impedance value of adjustment adjustment pipe S, and it is permanent thus to reach adjustment
The purpose of current circuit output electric current.In current-limiting control circuit, including test side, input terminal and output end, wherein test side
For the current signal Io of detection stream toning homogeneous tube S, input terminal is used to receive the reference signal that external reference voltage source generates, and adjusts
The control terminal of homogeneous tube is used to control the working condition that adjustment pipe is in different impedance values.
Specifically, when pwm signal is input to current-limiting control circuit, firstly, the input of current-limiting control circuit can be input to
End, if pwm signal is high level signal, current-limiting control circuit control adjustment pipe S work is in limited current state, at this point, flowing into LED
The electric current of load is electric current set by current-limiting control circuit, if pwm signal is low level signal, at this point, Current limited Control is electric
The signal of road input terminal becomes zero, and current-limiting control circuit control adjustment pipe S is disconnected, and will not flow into electric current in LED load, show
So, the brightness adjustment control to LED load may be implemented in this manner.
And when pwm signal is input to the test side in current-limiting control circuit, working principle and above-mentioned working principle on the contrary,
That is, current-limiting control circuit control adjustment pipe S is disconnected, if pwm signal is low level if pwm signal is high level signal
Signal, current-limiting control circuit control adjustment pipe S work is in limited current state.
Further, in practical application, conversion circuit can also be set between decoupling circuit and constant-current circuit,
That is, pwm signal is converted to analog signal Dim by conversion circuit, when analog signal Dim is acted in current-limiting control circuit
When input terminal, analog signal Dim can be then overlapped by conversion circuit with reference signal, and superimposed signal and test side
Signal is compared, when analog signal Dim acts on the test side of current-limiting control circuit, then by analog signal Dim and detection
After holding the detection signal of the signal Io of input to be overlapped, it is compared with reference signal, so that constant-current circuit output
Current amplitude changes with the variation of analog signal Dim.
On the basis of embodiment seven, embodiment eight is further described and optimizes to technical solution, as shown in Figure 10,
Specifically, current-limiting circuit includes amplifier U1, first resistor R1 and second resistance R2；
Wherein, the negative-phase input of amplifier U1 connects with the first end of first resistor R1 and the first end of second resistance R2 respectively
It connects, the positive input of amplifier U1 is for receiving reference signal；
The output end of amplifier U1 is the input terminal of current-limiting circuit, and the second end of second resistance R2 is the detection of current-limiting circuit
End, the second end of first resistor R1 are the output end of current-limiting circuit.
It in the present embodiment, is adjusted using amplifier U1 (operational amplifier), first resistor R1 and second resistance R2
Impedance value in homogeneous tube S.It should be noted that in the present embodiment, the normal phase input end of amplifier U1 and the note of negative input
The signal entered can be replaced, that is, if the signal of the normal phase input end of amplifier U1 is greater than the signal of negative-phase input, amplifier
Become larger, the adjust impedance of pipe of the output signal of U1 reduces therewith, at this point, the electric current of current-limiting control circuit output will become larger；Such as
The signal of the normal phase input end of fruit amplifier U1 is less than the signal of negative-phase input, then the output signal of amplifier U1 becomes smaller, adjusts pipe
Impedance increase with it, at this point, current-limiting control circuit output electric current will become smaller.Obviously, in this manner, can make
The electric current for inputting LED load is more stable, and thus further increases the dimming effect of LED load.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.For being filled disclosed in embodiment
For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part
Explanation.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of LED drive system of centrally connected power supply formula provided by the present invention is described in detail above, herein
Apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help
Understand method and its core concept of the invention；At the same time, for those skilled in the art, according to the thought of the present invention,
There will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as to this
The limitation of invention.
Claims (10)
1. a kind of LED drive system of centrally connected power supply formula characterized by comprising
AC-DC module, the coupling module for receiving pwm signal and it is N number of can solve pwm signal described in decoupling and utilize described in
Pwm signal adjusts the current stabilization module of LED load output electric current；N≥2；
Wherein, the input terminal of the AC-DC module connects AC power source, the first output end and the coupling of the AC-DC module
Mold the first output end connection of block, the second output terminal point of the second output terminal of the coupling module and the AC-DC module
It is not connect with the input terminal of N number of current stabilization module, the output end of N number of current stabilization module connects with N number of LED load respectively
It connects.
2. LED drive system according to claim 1, which is characterized in that the coupling module includes the first transformer；
Wherein, the primary side of first transformer is for receiving the pwm signal；
The first end of first transformer secondary is the first output end of the coupling module, first transformer secondary
Second end is the second output terminal of the coupling module.
3. LED drive system according to claim 2, which is characterized in that further include: the first block isolating circuit；
Wherein, first block isolating circuit is connected with the primary side of first transformer.
4. LED drive system according to claim 1, which is characterized in that the current stabilization module includes:
It is exported for solving the decoupling circuit of pwm signal described in decoupling and for adjusting the LED load according to the pwm signal
The constant-current circuit of electric current；
Wherein, the output end of the decoupling circuit is connect with the control terminal of the constant-current circuit；
The input terminal of the input terminal of the decoupling circuit and the constant-current circuit collectively forms the input terminal of the current stabilization module, institute
The output end for stating constant-current circuit is the output end of the current stabilization module.
5. LED drive system according to claim 1, which is characterized in that the decoupling circuit includes the second block isolating circuit
With the second transformer；
Wherein, one end of the block isolating circuit is connect with the first end of second transformer primary side；
The second end of the other end of second block isolating circuit and second transformer primary side collectively forms the decoupling circuit
Input terminal, the secondary side of second transformer is the output end of the decoupling circuit.
6. LED drive system according to claim 4, which is characterized in that further include: for the pwm signal to be converted
For the conversion circuit of analog signal；
Wherein, the input terminal of the conversion circuit is connect with the output end of the decoupling circuit, the output end of the conversion circuit
It is connect with the control terminal of the constant-current circuit.
7. LED drive system according to claim 4, which is characterized in that the constant-current circuit is specially DC/DC transformation electricity
Road or linear circuit.
8. LED drive system according to claim 7, which is characterized in that when the constant-current circuit is DC/DC transformation
When circuit, the DC/DC translation circuit includes DC/DC circuit, current loop circuit and exports for adjusting the current loop circuit
The control circuit of the amplitude of electric current；
Wherein, the output end of the DC/DC circuit is connect with the test side of the current loop circuit, the current loop circuit it is defeated
Outlet is connect with the input terminal of the control circuit, and the control terminal of the output end of the control circuit and the DC/DC circuit connects
It connects；
The control terminal of the DC/DC circuit is the input terminal of the constant-current circuit, and the output end of the DC/DC circuit is the perseverance
The output end of current circuit, the input terminal of the current loop circuit are the control terminal of the constant-current circuit.
9. LED drive system according to claim 7, which is characterized in that when the constant-current circuit is the linear circuit
When, the linear circuit includes adjustment pipe and current-limiting circuit；
Wherein, the control terminal of the adjustment pipe is connect with the output end of the current-limiting circuit, the detection of the current-limiting control circuit
It holds and is connect with one end of the adjustment pipe；
The other end of the adjustment pipe is the input terminal of the constant-current circuit, and the input terminal of the current-limiting control circuit is the perseverance
The control terminal of current circuit；
Correspondingly, the second output terminal of the coupling module is connected with one end of the LED load, one end of the adjustment pipe is also
It is connected with the other end of the LED load.
10. LED drive system according to claim 9, which is characterized in that the current-limiting circuit includes amplifier, the first electricity
Resistance and second resistance；
Wherein, the negative-phase input of the amplifier first end with the first end of the first resistor and the second resistance respectively
Connection, the positive input of the amplifier is for receiving reference signal；
The output end of the amplifier is the input terminal of the current-limiting circuit, and the second end of the second resistance is the current-limiting circuit
Test side, the second end of the first resistor is the output end of the current-limiting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811426724.7A CN109302775A (en) | 2018-11-27 | 2018-11-27 | A kind of LED drive system of centrally connected power supply formula |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811426724.7A CN109302775A (en) | 2018-11-27 | 2018-11-27 | A kind of LED drive system of centrally connected power supply formula |
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| Publication Number | Publication Date |
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| CN109302775A true CN109302775A (en) | 2019-02-01 |
Family
ID=65144891
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811426724.7A Withdrawn CN109302775A (en) | 2018-11-27 | 2018-11-27 | A kind of LED drive system of centrally connected power supply formula |
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| Country | Link |
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| CN (1) | CN109302775A (en) |
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