CN101932156A - Drive circuit of light-emitting diode and illumination device - Google Patents
Drive circuit of light-emitting diode and illumination device Download PDFInfo
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- CN101932156A CN101932156A CN200910150545XA CN200910150545A CN101932156A CN 101932156 A CN101932156 A CN 101932156A CN 200910150545X A CN200910150545X A CN 200910150545XA CN 200910150545 A CN200910150545 A CN 200910150545A CN 101932156 A CN101932156 A CN 101932156A
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Abstract
The invention discloses a drive circuit of a light-emitting diode and an illumination device. The drive circuit comprises a rectifying unit, a voltage division circuit, a control unit, a voltage converter, a resistor and a capacitor, wherein the rectifying unit rectifies an AC power supply to output a first working voltage; the voltage division circuit receives the first working voltage to generate a voltage division signal; the control unit comprises a voltage-stabilizing unit and a pulse width modulation (PWM) unit, wherein the output end of the voltage-stabilizing unit is coupled with the PWM unit, and the PWM unit outputs a PWM signal; the voltage converter regulates driving voltages and driving currents of the light-emitting diode according to the PWM signal; the resistor is coupled between the output end p of the rectifying unit and the diode; the capacitor is coupled between the power input end of the voltage-stabilizing unit and the grounding end; and the PWM unit regulates the PWM signal according to the voltage division signal and a feedback signal output by the voltage converter.
Description
Technical field
The invention relates to a kind of drive circuit and lighting device, and particularly relevant for a kind of driven for emitting lights diode (light emitting diode, drive circuit LED) and the lighting device that uses this drive circuit of being used for.
Background technology
Correlation technique part at lighting device has dimmer usually, in order to the control power supply so that light-emitting device (for example bulb) luminous except Push And Release also can have the luminous effect of fine setting.Fig. 1 illustrates known lighting device.Please refer to Fig. 1, lighting device 100 has power supply 102, dimmer 104 and bulb 106.Power supply 102 provides input voltage, and wherein input voltage can be alternating current.When the user saw through the illumination effect of dimmer 104 control bulbs 106, dimmer 104 can provide the illumination effect of voltage with fine setting bulb 106 according to turn-on condition.In addition, the light-emitting device that known lighting device 100 is disposed presents resistance characteristic usually with circuit structure, for example traditional osram lamp.
Yet along with under the scientific and technological trend of carbon reduction, (light emitting diode, LED) lamp becomes one of option of light-emitting device to light-emitting diode gradually.Therefore consider based on cost-effective, correlation technique can be come replacement bulb 106 with the LED lamp under the situation of not changing power supply 102 and dimmer 104.Just the LED lamp presents capacitance characteristic usually with circuit structure, so when the user sees through the brightness of dimmer 104 control LED lamps, the alternating current that power supply 102 is exported is after dimmer 104 conductings, and the voltage that dimmer 104 is provided can make the LED lamp present scintillation.
Therefore, a kind of light regulating technology of the LED of being applicable to lamp also is suggested.The output voltage demodulation of dimmer 104 being adjusted by LED dimmable ASIC (application specific integrated circuit) (demodulate) is inner corresponding voltage, and relatively corresponding voltage and triangular wave (triangular wave) to obtain a pulse wave (pulse).Then, relend pulse wave driving power transistor (power transistor) thus and control the magnitude of current, to reach the purpose of LED lamp light modulation by LED.Yet above-mentioned technology can increase the complexity of peripheral circuit, and also can increase cost of manufacture because chip for driving (driver IC) unit price is higher.
Summary of the invention
The invention provides a kind of drive circuit of light-emitting diode, can receive AC power that dimmer provides so that stable driving voltage of light-emitting diode and drive current to be provided.
The invention provides a kind of lighting device, can receive AC power that dimmer provides so that stable driving voltage and drive current to be provided, make light-emitting diode according to driving voltage and drive current to provide corresponding lightness stabilized.
The present invention proposes a kind of drive circuit of light-emitting diode, and it is applicable to and receives an AC power to drive a light-emitting diode.Drive circuit comprises a rectification unit, a bleeder circuit, a control unit, an electric pressure converter, a resistance and one first electric capacity.Rectification unit in order to rectification AC power to export one first operating voltage.Bleeder circuit is coupled to rectification unit, and receives first operating voltage to produce the voltage division signal corresponding to first operating voltage.Control unit comprises a voltage regulation unit and a pulse width modulation (PWM) unit.The output of voltage regulation unit is coupled to the PWM unit.PWM exports the unit pwm signal.Electric pressure converter is coupled between control unit and the light-emitting diode, in order to the driven for emitting lights diode, and adjusts a driving voltage and a drive current of light-emitting diode according to pwm signal.Resistance is coupled between the output and a diode of rectification unit.The other end of diode is coupled to a power input of voltage regulation unit.One first electric capacity is coupled between this power input and an earth terminal of voltage regulation unit.The feedback signal that the PWM unit is exported according to voltage division signal and electric pressure converter is adjusted pwm signal.
In one embodiment of this invention, drive circuit more comprises one second electric capacity, is coupled between the output and earth terminal of voltage regulation unit.
In one embodiment of this invention, above-mentioned electric pressure converter is coupled to the output of rectification unit.
In one embodiment of this invention, above-mentioned rectification unit comprises a rectifier, in order to rectification AC power to produce a commutating voltage.
In one embodiment of this invention, above-mentioned rectification unit comprises that more a filter is coupled to the output of rectifier, receives commutating voltage to export this first operating voltage to electric pressure converter.
In one embodiment of this invention, above-mentioned commutating voltage equals first operating voltage in fact.
In one embodiment of this invention, above-mentioned voltage regulation unit receives first operating voltage to export one second operating voltage to pulse width modulation (PWM) unit.
In one embodiment of this invention, above-mentioned electric pressure converter is a reduction voltage circuit.
In one embodiment of this invention, above-mentioned AC power is via the adjusted AC power of a dimmer.
The present invention proposes lighting device, and it is applicable to and receives an AC power to throw light on.Lighting device comprises a light-emitting diode and one drive circuit.Drive circuit couples light-emitting diode.Drive circuit comprises a rectification unit, a bleeder circuit, a control unit, an electric pressure converter, a resistance and one first electric capacity.Rectification unit in order to rectification AC power to export one first operating voltage.Bleeder circuit is coupled to rectification unit, and receives first operating voltage to produce the voltage division signal corresponding to first operating voltage.Control unit comprises a voltage regulation unit and a pulse width modulation (PWM) unit.The output of voltage regulation unit is coupled to the PWM unit.PWM exports the unit pwm signal.Electric pressure converter is coupled between control unit and the light-emitting diode, in order to the driven for emitting lights diode, and adjusts a driving voltage and a drive current of light-emitting diode according to pwm signal.Resistance is coupled between the output and a diode of rectification unit.The other end of diode is coupled to a power input of voltage regulation unit.One first electric capacity is coupled between this power input and an earth terminal of voltage regulation unit.The feedback signal that the PWM unit is exported according to voltage division signal and electric pressure converter is adjusted pwm signal.
Based on above-mentioned, lighting device provided by the present invention comprises the drive circuit and the light-emitting diode of light-emitting diode.Therefore the lighting device that has light-emitting diode can be directly installed on traditional lamp socket, and can carry out light modulation by traditional dimmer.Drive circuit can receive the AC power that dimmer provides, and according to the duration of work and the pulse width modulating signal of pulse wave signal, and continues the driving voltage and the drive current that provide stable by the bypass elements of resistance, diode and electric capacity.Therefore, lighting device of the present invention not only can be adjusted the brightness of light-emitting diode, can avoid light-emitting diode to produce the situation of flicker because of the waveform change of AC power simultaneously.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates known lighting device.
Fig. 2 illustrates the lighting device according to one embodiment of the invention.
Fig. 3 A illustrates the oscillogram into AC power Vin.
Fig. 3 B illustrates the oscillogram into commutating voltage Vm.
It is the oscillogram of the first operating voltage Vf that Fig. 3 C illustrates.
Fig. 4 A illustrates the local circuit schematic diagram into the lighting device of another embodiment of the present invention.
Fig. 4 B illustrates the detailed circuit diagram into Fig. 4 A control unit.
Fig. 5 illustrates the illuminator schematic diagram into another embodiment of the present invention.
It is the oscillogram of first operating voltage and drive current that Fig. 6 illustrates.
It is the oscillogram of first operating voltage and second operating voltage that Fig. 7 A to Fig. 7 C illustrates.
The main element symbol description:
100,200,300,400: lighting device
102,230: power supply
104,240: dimmer
106: bulb
210: light-emitting diode
220: drive circuit
222: rectification unit
222a: rectifier
222b: filter
224: bleeder circuit
226,310: control unit
226a, 312: voltage regulation unit
226b, 314: pulse width modulation (PWM) unit
228: electric pressure converter
314a: first comparator
314b: second comparator
314c: logic sum gate
314d: processor
R
1～R
7: resistance
C
1～C
3: electric capacity
D
1: diode
Vs: input voltage
Vin: AC power
Vm: commutating voltage
Vf: first operating voltage
V
DD: second operating voltage
Vd: voltage division signal
IL: feedback signal
PWMS: pulse width modulating signal
Vdr: driving voltage
Idr: drive current
Vss: earth terminal
T1, T2, T3, T4: duration of work
V
IN: the power input mouth
LD: linearity light adjusting port
Vdd: voltage output end mouth
PWMD: reference signal input port
CS: feedback signal input port
GND: grounding ports
RT: frequency configuration port
GATE: signal output port
S
REF: reference signal
SC1: first comparison signal
SC2: second comparison signal
S
CRL: control signal
Embodiment
Fig. 2 illustrates the lighting device according to one embodiment of the invention.Please refer to Fig. 2, lighting device 200 comprises light-emitting diode (light emitting diode, LED) 210 and drive circuit 220.Drive circuit 220 comprises rectification unit 222, bleeder circuit 224, control unit 226, electric pressure converter 228, resistance R
1, capacitor C
2And diode D
1In the present embodiment, lighting device 200 more can comprise power supply 230 and dimmer 240, and wherein dimmer 240 receives the input voltage Vs that power supplys 230 are provided, and according to turn-on condition with output AC power source Vin.In the present embodiment, dimmer 240 can adopt the three-pole AC switch (Tri-electrode AC switch TRIAC) implementing its function, but is not restricted to this.In addition, the TRIAC dimmer is corresponding adjusts nine grades that the illumination intensity of light source value can be divided into maximum (MAX), first section to the 7th section and minimum (MIN) in regular turn, wherein corresponding different delay angle (delay angle) α of each grade.The big more then angle of flow of delay angles alpha is more little, and the time of representing dimmer 240 to close is long more.In addition, power supply 230 can be AC power of using in the city or the power supply that power supply unit provided, but is not restricted to this.
In addition, the rectification unit 222 of present embodiment more can comprise rectifier 222a and filter 222b, and its median filter 222b is coupled to the output of rectifier 222a.Rectifier 222a carries out rectification at AC power Vin, so as to producing commutating voltage Vm and transfer to filter 222b, and filter 222b further the output first operating voltage Vf to bleeder circuit 224, control unit 226 and electric pressure converter 228.In addition, the control unit 226 of present embodiment also comprises voltage regulation unit 226a and pulse width modulation (pulsewidth modulation, PWM) unit 226b.Voltage regulation unit 226a receives the first operating voltage Vf to export the second stable operating voltage V
DDTo PWM unit 226b.On the other hand, PWM unit 226b is according to the voltage division signal Vd of bleeder circuit 224, and the feedback signal iL that provided of electric pressure converter 228, produces pulse width modulating signal PWMS according to this and gives electric pressure converter 228.Then, but just driven for emitting lights diode 210 of electric pressure converter 228, and adjust the driving voltage Vdr and the drive current Idr of light-emitting diode 210 according to pulse width modulating signal PWMS.
As shown in Figure 2, the bleeder circuit 224 of present embodiment can comprise resistance R
2And R
3Bleeder circuit 224 sees through resistance R
3Be coupled to earth terminal Vss, to transfer the first operating voltage Vf step-down to voltage division signal Vd, wherein voltage division signal Vd is in resistance R
2With R
3Common node export PWM unit 226b to.In addition, the adding of bleeder circuit 224 can improve the capacitance characteristic of known LED lighting device, and then (power factor is PF) to about 0.962 to promote the overall power factor of lighting device 200.
It should be noted that the capacitor C of Fig. 2
2Be in order to storing the required driving voltage of control unit 226, i.e. the first operating voltage Vf that provided of rectification unit 222.So, even dimmer 240 is adjusted to minimum position when very big (be TRIAC delay angles alpha), control unit 226 also has enough driving voltages to be driven, and then avoids the scintillation of light-emitting diode 210 because of voltage instability.On the other hand, the resistance R of Fig. 2
1Be current-limiting resistance, it is coupled to the output and the diode D of rectification unit 222
1Between, can influence capacitor C
2Charging interval.In detail, if capacitor C
2Charging interval want fast, resistance R then
1Will be little, capacitor C wherein
2Be coupled between the power input and earth terminal Vss of voltage regulation unit 226a.In addition, the diode D of present embodiment
1The other end be coupled to the power input of voltage regulation unit 226a, it can limit the flow direction of electric current.That is to say that diode D flows through
1Electric current can only flow to the direction of control unit 226 by rectification unit 222.Thus, just can avoid being stored in capacitor C
2Energy run off from original charge path, cause capacitor C originally
2Charge path become discharge path.In like manner, the lighting device 200 of present embodiment more can comprise capacitor C
1Capacitor C
1Be coupled between the output and earth terminal Vss of voltage regulation unit 226a, to stablize the second operating voltage V of PWM unit 226b
DD
For the running of lighting device 200 that this enforcement is described, the coherent signal when Fig. 3 A to Fig. 3 C illustrates lighting device 200 runnings or the oscillogram of voltage.Fig. 3 A illustrates the oscillogram into AC power Vin.Please be simultaneously with reference to Fig. 2 and Fig. 3 A, dimmer 240 utilizes the turn-on condition of adjusting three-pole AC switch TRAIC, so as to adjusting duration of work and the waveform of AC power Vin.In other words, dimmer 240 can be adjusted duration of work T1 and the T2 of AC power Vin in half cycle.Then, rectifier 222a can carry out rectification at AC power Vin, and commutating voltage Vm is provided according to this, and wherein the oscillogram of commutating voltage Vm is shown in Fig. 3 B.
Please refer to Fig. 2 to Fig. 3 B, furthermore, when the duration of work of AC power Vin and waveform change, the duration of work of commutating voltage Vm and waveform also can change thereupon.For example T3 changes along with T1, and T4 then changes along with T2.In view of the above, rectification unit 222 provides to the driving voltage Vdr of light-emitting diode 210 and drive current Idr and also can change thereupon, and then the brightness of control light-emitting diode 210.In this enforcement was shown, rectifier 222a can adopt bridge rectifier (bridge rectifier), but is not restricted to this.
In addition, filter 222b is in order to receiving commutating voltage Vm, and carries out filtering to provide the first operating voltage Vf to control unit 226, and wherein the oscillogram of the first operating voltage Vf is shown in Fig. 3 C.Then, pressurizer 226a receives the first operating voltage Vf, and PWM unit 226b is provided the second operating voltage V in when running
DD, operate in order to PWM unit 226b.
According to above-mentioned, because the second operating voltage V
DDPower supply when 226b running in PWM unit is provided, so the feedback signal iL that PWM unit 226b can utilize voltage division signal Vd and electric pressure converter 228 to be fed back adjusts pulse width modulation (pulse width modulation, PWM) signal PWMS.On the other hand, electric pressure converter 228 can be adjusted driving voltage Vdr and the brightness of drive current Idr with adjustment light-emitting diode 204 according to pulse width modulating signal PWMS.In addition, the driving voltage Vdr and the drive current Idr that are provided through electric pressure converter 228 are comparatively stable, can make light-emitting diode 204 provide lightness stabilized, and reduce scintillation.
In this enforcement demonstration example, electric pressure converter 228 can be reduction voltage circuit, also can adopt buck-converter (buck converter) implementing its function, but be not restricted to this.In addition, electric pressure converter 228 exportable feedback signal iL to PWMS unit 226b, but PWMS unit 226b feedback loop reference signal iL and then adjustment pulse width modulating signal PWMS.Comprise driving voltage Vdr that electric pressure converter 228 is exported and the state of drive current Idr among this feedback signal iL.
On the other hand, the control unit 226 of present embodiment can adopt ASIC(Application Specific Integrated Circuit) (application-specific integrated circuit ASIC) realizes implementing control unit 226, but is not restricted to this.Fig. 4 A is the local circuit schematic diagram of the lighting device 300 of another embodiment of the present invention.Please be simultaneously with reference to Fig. 2 and Fig. 4 A, Fig. 2 is similar to Fig. 4 A, and the two main difference part is: the control unit 310 of Fig. 4 A is ASIC(Application Specific Integrated Circuit).In detail, control unit 310 is that voltage regulation unit 226a and PWM unit 226b with Fig. 2 combines.On the other hand, lighting device more than 300 as capacitor C
3, resistance R
5～R
7Bypass elements, it can make the voltage of circuit more stable.
Fig. 4 B is the detailed circuit diagram of Fig. 4 A control unit 310.Please be simultaneously with reference to Fig. 4 A and Fig. 4 B, control unit 310 is an ASIC(Application Specific Integrated Circuit), it can comprise voltage regulation unit 312 and PWM unit 314.In addition, control unit 310 also comprises a plurality of input/output end ports (I/O port), is respectively power input mouth V
IN, linearity light adjusting port LD, voltage output end mouth Vdd, reference signal input port PWMD, feedback signal input port CS, grounding ports GND, frequency configuration port RT and signal output port GATE, wherein frequency configuration port RT is in order to be provided with the concussion frequency of ASIC(Application Specific Integrated Circuit).Voltage regulation unit 312 is coupled to power input mouth V
INAnd between the voltage output end mouth Vdd, and see through power input mouth V
INReception is from the first operating voltage Vf of rectification unit 222 (being illustrated in Fig. 2), and exports the second operating voltage V in voltage output end mouth Vdd
DDOperating voltage as PWM unit 314.
Shown in Fig. 4 B, PWM unit 314 comprises the first comparator 314a, the second comparator 314b, logic sum gate 314c and processor 314d.The first comparator 314a receives voltage division signal Vd by linearity light adjusting port LD, and by feedback signal input port CS receiving feedback signals iL, and export the first comparison signal SC1 according to this.The second comparator 314b is by feedback signal input port CS receiving feedback signals iL and reference signal S
REF, and export the second comparison signal SC2 according to this.
Then, logic sum gate 314c is according to the first comparison signal SC1 and second comparison signal SC2 output control signal S
CRLProcessor 314d and logic sum gate 314c electrically connect.In the present embodiment, processor 314d is according to control signal S
CRLIn signal output port GATE output pulse width modulation signal PWMS.In addition, shown in Fig. 4 A, voltage output end mouth Vdd sees through resistance R
4Electrically connect with reference signal input port PWMD, and be electrically connected to capacitor C
1In addition, about resistance R
1, capacitor C
1～C
2And diode D
1Effect can just do not given unnecessary details at this with reference to above stated specification.
Fig. 5 is illuminator 400 schematic diagrames of another embodiment of the present invention.Illuminator 400 is similar with illuminator 200, and the two main difference is: the rectification unit of illuminator 400 does not comprise filter 222b.That is to say that the rectification unit 222 of illuminator 400 equals the rectifier 222a of illuminator 200.Therefore, the first operating voltage Vf of present embodiment equals the commutating voltage Vm of Fig. 2 in fact.
Please refer to Fig. 3 A～3B and Fig. 5, according to the above description, the user can see through the brightness of dimmer 240 and lighting device 220 control light-emitting diodes 210.In detail, the user can see through dimmer 240 and adjust AC power Vin, makes AC power Vin have duration of work T1 and T2.Rectifier 222a carries out rectification at AC power Vin, and exports the first operating voltage Vf with duration of work T3 and T4, and wherein T3 changes along with T1, and T4 then changes along with T2.Then, control unit 226 can provide pulse width modulating signal PWMS to electric pressure converter 228 according to voltage division signal Vd and feedback signal iL.
At last, electric pressure converter 228 provides stable driving voltage Vdr and drive current Idr, makes light-emitting diode 210 that stable brightness is provided, and reduces scintillation.In view of the above, when the AC power Vin that is received when rectifier 212 changed, driving voltage Vdr and drive current Idr that electric pressure converter 228 is provided will change accordingly.So the brightness that light-emitting diode 210 provides also can change thereupon, and then reach the function of adjusting light-emitting diode 210 brightness.Electric pressure converter 228 that it should be noted that this example directly couples rectification unit 222, and it equals the rectifier 222a of Fig. 2.That is to say the effect of the first operating voltage Vf non-filtered device 222b (being illustrated in Fig. 2) of present embodiment.Therefore, the drive current Idr of light-emitting diode 210 can have identical phase place with the first operating voltage Vf that rectification unit 222 is exported, and wherein the oscillogram of the first operating voltage Vf and drive current Idr illustrates as Fig. 6.
Fig. 6 is when the TRIAC dimmer is adjusted to the 3rd fragment position (being delay angles alpha=64 degree), the first operating voltage Vf and drive current Idr oscillogram, and wherein wave width modulating signal PWMS is the subcarrier (sub-carrier) on the drive current Idr.Electric pressure converter 228 is controlled the switch of light-emitting diode 210 according to wave width modulating signal PWMS.As shown in Figure 6, because the first operating voltage Vf and drive current Idr have same phase, so the lighting device 400 of present embodiment can reach about 0.962 High Power Factor.On the other hand, the dimming function that utilize this kind same phase, has a hardware linearity also can significantly promote the tunable optical scope of lighting device 400.
Fig. 7 A to Fig. 7 C illustrate into lighting device 400 under different delay angles alpha, the first operating voltage Vf and the second operating voltage V
DDOscillogram.In detail, Fig. 7 A, Fig. 7 B are respectively the situation that (maximum position of corresponding dimmer), α=64 degree (the 3rd fragment position of corresponding dimmer) and α=155 degree (minimum position of corresponding dimmer) are spent in delay angles alpha=26 with Fig. 7 C.Shown in Fig. 7 A and Fig. 7 B, when delay angles alpha=26 degree and 64 is spent, the second operating voltage V
DDAll maintain the burning voltage of magnitude of voltage 7.5V, and when delay angles alpha=155 are spent, the second operating voltage V
DDAlso can maintain the burning voltage of 7.4V.Therefore, no matter the turn-on condition of dimmer 240 why, control unit 226 all can be because of capacitor C
2The existence of (being illustrated in Fig. 5) and have enough voltage to be driven, and then provide stable driving voltage Vdr and drive current Idr to light-emitting diode 210.In addition, about capacitor C
2Effect in the above stated specification mistake, just do not add at this and to give unnecessary details.
In sum, lighting device provided by the present invention comprises the drive circuit and the light-emitting diode of light-emitting diode, and the lighting device with light-emitting diode can be directly installed on traditional lamp socket, and can carry out light modulation by traditional dimmer.Lighting device carry out rectification at the AC power that dimmer provided and according to first operating voltage and feedback signal output pulse width modulation signal with the adjustment electric pressure converter, allow electric pressure converter can provide stable driving voltage and drive current to light-emitting diode.Whereby, not only can adjust the brightness of light-emitting diode, can avoid light-emitting diode to produce the situation of flicker because of the waveform change of AC power simultaneously.On the other hand, because first operating voltage and drive current that illuminator provided by the present invention adopts have same phase, therefore can reach the scope of High Power Factor and lifting tunable optical.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (18)
1. the drive circuit of a light-emitting diode is applicable to receive an AC power to drive a light-emitting diode, and this drive circuit comprises:
One rectification unit, in order to this AC power of rectification to export one first operating voltage;
One bleeder circuit is coupled to this rectification unit, receives this first operating voltage to produce the voltage division signal corresponding to this first operating voltage;
One control unit comprises a voltage regulation unit and a pwm unit, and wherein the output of this voltage regulation unit is coupled to this pwm unit, and this pwm unit is exported a pulse width modulating signal;
One electric pressure converter is coupled between this control unit and this light-emitting diode, in order to driving this light-emitting diode, and adjusts a driving voltage and a drive current of this light-emitting diode according to this pulse width modulating signal;
One resistance is coupled between the output and a diode of this rectification unit, and the other end of this diode is coupled to a power input of this voltage regulation unit; And
One first electric capacity is coupled between this power input and an earth terminal of this voltage regulation unit;
Wherein, the feedback signal exported according to this voltage division signal and this electric pressure converter of this pwm unit is adjusted this pulse width modulating signal.
2. drive circuit as claimed in claim 1 is characterized in that, more comprises one second electric capacity, is coupled between the output and this earth terminal of this voltage regulation unit.
3. drive circuit as claimed in claim 1 is characterized in that this electric pressure converter is coupled to the output of this rectification unit.
4. drive circuit as claimed in claim 1 is characterized in that this rectification unit comprises a rectifier, and this AC power of rectification is to produce a commutating voltage.
5. drive circuit as claimed in claim 4 is characterized in that this rectification unit more comprises a filter, is coupled to the output of this rectifier, receives this commutating voltage to export this first operating voltage to this electric pressure converter.
6. drive circuit as claimed in claim 4 is characterized in that, this commutating voltage equals this first operating voltage in fact.
7. drive circuit as claimed in claim 1 is characterized in that, this voltage regulation unit receives this first operating voltage to export one second operating voltage to this pwm unit.
8. drive circuit as claimed in claim 1 is characterized in that, this electric pressure converter is a reduction voltage circuit.
9. drive circuit as claimed in claim 1 is characterized in that, this AC power is via the adjusted AC power of a dimmer.
10. a lighting device is applicable to receive an AC power to throw light on, and this lighting device comprises:
One light-emitting diode; And
One drive circuit couples this light-emitting diode, and this drive circuit comprises:
One rectification unit, in order to this AC power of rectification to export one first operating voltage;
One bleeder circuit is coupled to this rectification unit, receives this first operating voltage to produce the voltage division signal corresponding to this first operating voltage;
One control unit comprises a voltage regulation unit and a pwm unit, and wherein the output of this voltage regulation unit is coupled to this pwm unit, and this pwm unit is exported a pulse width modulating signal;
One electric pressure converter is coupled between this controller and this light-emitting diode driving this light-emitting diode, and adjusts a driving voltage and a drive current of this light-emitting diode according to this pulse width modulating signal;
One resistance is coupled between the output and a diode of this rectification unit, and the other end of this diode is coupled to a power input of this voltage regulation unit; And
One first electric capacity is coupled between this power input and an earth terminal of this voltage regulation unit;
Wherein, the feedback signal exported according to this voltage division signal and this electric pressure converter of this pwm unit is adjusted this pulse width modulating signal.
11. lighting device as claimed in claim 10 is characterized in that, more comprises one second electric capacity, is coupled between the output and this earth terminal of this voltage regulation unit.
12. lighting device as claimed in claim 10 is characterized in that, this electric pressure converter couples the output of this rectification unit.
13. lighting device as claimed in claim 10 is characterized in that, this rectification unit comprises a rectifier, and this AC power of rectification is to produce a commutating voltage.
14. lighting device as claimed in claim 13 is characterized in that, this rectification unit more comprises a filter, is coupled to the output of this rectifier, receives this commutating voltage to export this first operating voltage to this electric pressure converter.
15. lighting device as claimed in claim 13 is characterized in that, this commutating voltage equals this first operating voltage in fact.
16. lighting device as claimed in claim 13 is characterized in that, this voltage regulation unit receives this first operating voltage to export one second operating voltage to this pwm unit.
17. lighting device as claimed in claim 13 is characterized in that, this electric pressure converter is a reduction voltage circuit.
18. lighting device as claimed in claim 13 is characterized in that, this AC power is via the adjusted AC power of a dimmer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910150545XA CN101932156A (en) | 2009-06-19 | 2009-06-19 | Drive circuit of light-emitting diode and illumination device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910150545XA CN101932156A (en) | 2009-06-19 | 2009-06-19 | Drive circuit of light-emitting diode and illumination device |
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| CN101932156A true CN101932156A (en) | 2010-12-29 |
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| CN200910150545XA Pending CN101932156A (en) | 2009-06-19 | 2009-06-19 | Drive circuit of light-emitting diode and illumination device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573233A (en) * | 2012-01-10 | 2012-07-11 | 张从峰 | Light-emitting diode (LED) intelligent module capable of performing voltage self-regulation |
| CN102869150A (en) * | 2012-08-17 | 2013-01-09 | 明基电通有限公司 | LED control circuit and light emitting device |
| CN102905414A (en) * | 2011-07-27 | 2013-01-30 | 富泰华工业（深圳）有限公司 | Light emitting device |
| CN105430833A (en) * | 2014-09-15 | 2016-03-23 | 美格纳半导体有限公司 | Circuit For Driving Ac Direct Lighting Apparatus And Method Therefor |
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| CN102869150A (en) * | 2012-08-17 | 2013-01-09 | 明基电通有限公司 | LED control circuit and light emitting device |
| CN105430833A (en) * | 2014-09-15 | 2016-03-23 | 美格纳半导体有限公司 | Circuit For Driving Ac Direct Lighting Apparatus And Method Therefor |
| CN105430833B (en) * | 2014-09-15 | 2019-06-07 | 美格纳半导体有限公司 | The straight circuit and its method for driving lighting apparatus of driving exchange |
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Application publication date: 20101229 |