CN202488842U - Virtual channel connection (VCC) control circuit for power factor correction (PFC) circuit of light emitting diode (LED) silicon controlled dimming power supply - Google Patents
Virtual channel connection (VCC) control circuit for power factor correction (PFC) circuit of light emitting diode (LED) silicon controlled dimming power supply Download PDFInfo
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- CN202488842U CN202488842U CN2012200986375U CN201220098637U CN202488842U CN 202488842 U CN202488842 U CN 202488842U CN 2012200986375 U CN2012200986375 U CN 2012200986375U CN 201220098637 U CN201220098637 U CN 201220098637U CN 202488842 U CN202488842 U CN 202488842U
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Abstract
The utility model discloses a virtual channel connection (VCC) control circuit for a power factor correction (PFC) circuit of a light emitting diode (LED) silicon controlled dimming power supply. A metal oxide semiconductor (MOS) tube is connected in series to a VCC pin of the PFC circuit and controlled by an external voltage comparison circuit and an external boosted circuit, so that the PFC circuit is controlled. The output frequency of a GATE pin of a pulse width modulation (PWM) pulse generation unit varies with the angle of a chopping signal of a silicon controlled dimmer, and the large angle of the chopping signal results in low frequency; the boosted circuit is subjected to potential change according to the signal frequency output by the GATE pin, the high frequency results in the high potential of the stabilivolt negative pole in the voltage comparison circuit, and on the contrary, the low frequency results in low potential. The voltage comparison circuit controls the turn-on and turn-off of the MOS tube Q1 according to the potential change so as to control the PFC circuit.
Description
Technical field
The utility model relates to a kind of LED controllable silicon light modulation power supply, is specifically related to a kind of VCC control circuit of the LED of being used for controllable silicon light modulation power supply pfc circuit.
Background technology
Use at present to be divided into active PFC and passive PFC at the PFC of LED controllable silicon light modulation circuit, active PFC can be divided into single-stage PFC and two-stage type circuit (PFC+PWM circuit) again in reality.Passive PFC circuit PF is low, and harmonic wave suppresses ability; Single-stage PFC circuit PF value is high, and it is good that harmonic wave suppresses ability, but because no jumbo electrochemical capacitor behind the input rectifying exists output ripple high, problem such as easy flicker during dimmer application; Two-stage type PFC+PWM circuit has high PF, low harmonic wave, and low ripple, good stability, but the PFC circuit can get into the OVP protected mode when load is light, and chip can constantly be restarted, and also can cause the flicker that in the light modulation process, can occur at very dark state.
Summary of the invention
The utility model purpose is to provide a kind of VCC control circuit of the LED of being used for controllable silicon light modulation power supply pfc circuit; It realizes the control to pfc circuit, solves the flicker problem of pfc circuit in the LED controllable silicon light modulation is used, and its realization is simple in structure; Reliably, practicality, be easy to realize.
In order to solve these problems of the prior art, the technical scheme that the utility model provides is:
A kind of VCC control circuit that is used for LED controllable silicon light modulation power supply pfc circuit; Said LED controllable silicon light modulation power supply is kept current circuit with intelligence and is comprised controllable silicon dimmer, rectification circuit, power converter and LED load; After linking to each other with controllable silicon dimmer, AC power inserts rectification circuit; Power converter links to each other, and the LED load links to each other with the output of power converter, and said controllable silicon light modulation power supply also comprises pfc circuit and pwm pulse generating unit; The input rectification circuit of said pfc circuit links to each other; The VCC pin of said pfc circuit and the GATE pin that inserts the pwm pulse generating unit after the VCC control circuit links to each other again, said VCC control circuit comprises metal-oxide-semiconductor Q1, booster circuit and voltage comparator circuit, the source electrode of said metal-oxide-semiconductor Q1 links to each other with the VCC pin of pfc circuit; Insert booster circuit after said metal-oxide-semiconductor Q1 links to each other with voltage comparator circuit again, the input of said booster circuit links to each other with the GATE pin of pwm pulse generating unit.
For technique scheme; As supplementary notes; Described voltage comparator circuit comprises resistance R 1, voltage-stabiliser tube DZ1; The negative pole of said voltage-stabiliser tube DZ1 links to each other with an end of resistance R 1, and the positive pole of said voltage-stabiliser tube DZ1 links to each other with the grid of metal-oxide-semiconductor Q1, and the other end of said resistance R 1 links to each other with booster circuit.
As replenishing; Said booster circuit comprises resistance R 2, resistance R 5, resistance R 8, resistance R 9, capacitor C 3, capacitor C 6, diode D1, diode D3, voltage-stabiliser tube DZ4 and triode Q2; The other end of said resistance R 1 links to each other with the negative pole of voltage-stabiliser tube DZ4, and the negative pole of voltage-stabiliser tube DZ4 links to each other with the negative pole of diode D1, and the negative pole of diode D1 links to each other with an end of capacitor C 3, an end of resistance R 2; The other end of the other end of torch C3, resistance R 2 links to each other with the positive pole of diode D3; The negative pole of diode D3 all links to each other with the positive pole of diode D1, and the anodal of the positive pole of diode D3, voltage-stabiliser tube DZ4 all links to each other with the drain electrode of metal-oxide-semiconductor, and the positive pole of diode D3 links to each other with an end of resistance R 5; The negative pole of diode D3 links to each other with an end of capacitor C 6; The other end of the other end of capacitor C 6, resistance R 5 all links to each other with the collector electrode of triode Q2, inserts the GATE pin of pwm pulse generating unit after the base stage of triode Q2 is connected with resistance R 8, the grounded emitter of triode Q2; One end of resistance R 9 links to each other with the base stage of triode Q2, and the other end of resistance R 9 links to each other with the emitter of triode Q2.
Than solution of the prior art, the utility model advantage is:
The utility model is controlled metal-oxide-semiconductor through the voltage comparator circuit and the booster circuit of outside through the metal-oxide-semiconductor of connecting at the VCC of pfc circuit pin, and then realizes the control to pfc circuit.The output frequency of pwm pulse generating unit GATE pin changes along with the angle of the chopping signal of controllable silicon dimmer; The big more frequency of copped wave angle is low more; And the signal frequency that booster circuit is exported according to the GATE pin produces the variation of potential value, frequency high more with voltage comparator circuit in the current potential of voltage-stabiliser tube negative pole end high more, otherwise then low more; Voltage comparator circuit ends and conducting according to this potential change control metal-oxide-semiconductor Q1's, and then realizes the control to the PFC circuit.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 is the structured flowchart of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the VCC control circuit part of the utility model embodiment.
Embodiment
Below in conjunction with specific embodiment such scheme is further specified.Should be understood that these embodiment are used to the present invention is described and are not limited to limit scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
The overall structure of present embodiment is as shown in Figure 1; A kind of VCC control circuit that is used for LED controllable silicon light modulation power supply pfc circuit; Said LED controllable silicon light modulation power supply is kept current circuit with intelligence and is comprised controllable silicon dimmer, rectification circuit, power converter and LED load; Insert rectification circuit after AC power links to each other with controllable silicon dimmer, power converter links to each other, and the LED load links to each other with the output of power converter; Said controllable silicon light modulation power supply also comprises pfc circuit and pwm pulse generating unit; The input rectification circuit of said pfc circuit links to each other, the VCC pin of said pfc circuit and the GATE pin that inserts the pwm pulse generating unit after the VCC control circuit links to each other again, and said VCC control circuit is as shown in Figure 2; It comprises metal-oxide-semiconductor Q1, booster circuit and voltage comparator circuit; The source electrode of said metal-oxide-semiconductor Q1 links to each other with the VCC pin of pfc circuit, inserts booster circuit after said metal-oxide-semiconductor Q1 links to each other with voltage comparator circuit again, and the input of said booster circuit links to each other with the GATE pin of pwm pulse generating unit.
Described voltage comparator circuit comprises resistance R 1, voltage-stabiliser tube DZ1, and the negative pole of said voltage-stabiliser tube DZ1 links to each other with an end of resistance R 1, and the positive pole of said voltage-stabiliser tube DZ1 links to each other with the grid of metal-oxide-semiconductor Q1, and the other end of said resistance R 1 links to each other with booster circuit.
Said booster circuit comprises resistance R 2, resistance R 5, resistance R 8, resistance R 9, capacitor C 3, capacitor C 6, diode D1, diode D3, voltage-stabiliser tube DZ4 and triode Q2; The other end of said resistance R 1 links to each other with the negative pole of voltage-stabiliser tube DZ4; The negative pole of voltage-stabiliser tube DZ4 links to each other with the negative pole of diode D1; The negative pole of diode D1 links to each other with an end of capacitor C 3, an end of resistance R 2, and the other end of the other end of torch C3, resistance R 2 links to each other with the positive pole of diode D3, and the negative pole of diode D3 all links to each other with the positive pole of diode D1; The anodal of the positive pole of diode D3, voltage-stabiliser tube DZ4 all links to each other with the drain electrode of metal-oxide-semiconductor Q1; In addition, in Fig. 2 frame of broken lines power circuit, the output of said power circuit inserts the drain electrode of metal-oxide-semiconductor Q1.The positive pole of diode D3 links to each other with an end of resistance R 5; The negative pole of diode D3 links to each other with an end of capacitor C 6; The other end of the other end of capacitor C 6, resistance R 5 all links to each other with the collector electrode of triode Q2, inserts the GATE pin of pwm pulse generating unit after the base stage of triode Q2 is connected with resistance R 8, the grounded emitter of triode Q2; One end of resistance R 9 links to each other with the base stage of triode Q2, and the other end of resistance R 9 links to each other with the emitter of triode Q2.
During operate as normal, the GATE pin of pwm pulse generating unit output pwm pulse drives triode Q2, gives capacitor C 6 chargings when triode Q2 conducting A point sees through diode D3; When triode Q2 by the time capacitor C 6 discharge and give capacitor C 3 chargings, so B point current potential is raised, and by voltage-stabiliser tube DZ4 clamper; This moment, B point current potential was higher than DZ1, and the C point obtains high potential, metal-oxide-semiconductor Q1 conducting; The VCC pin of pfc circuit gets electric, and pfc circuit is started working.
During light modulation work, the TRIAC pin of pwm pulse generating unit detects the controllable silicon dimmer chopping signal, and the output frequency of its GATE pin is along with the angle of the copped wave of controllable silicon dimmer changes, and the big more frequency of copped wave angle is low more.Capacitor C 6 discharges and recharges number of times and is reduced during frequencies go lower, and B point potential rise presses off the beginning and is lower than DZ4 clamper value, when the GATE of pwm pulse generating unit pin frequency drops to when very low; B point current potential is lower than the DZ1 limit value; The C point can not get high potential, and this moment, Q1 ended, and U1 quits work.
The TRIAC dimmer can be realized the control to the PFC circuit simultaneously when light modulation thus.
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (3)
1. VCC control circuit that is used for LED controllable silicon light modulation power supply pfc circuit; Said LED controllable silicon light modulation power supply is kept current circuit with intelligence and is comprised controllable silicon dimmer, rectification circuit, power converter and LED load; Insert rectification circuit after AC power links to each other with controllable silicon dimmer, power converter links to each other, and the LED load links to each other with the output of power converter; It is characterized in that; Said controllable silicon light modulation power supply also comprises pfc circuit and pwm pulse generating unit, and the input rectification circuit of said pfc circuit links to each other, the VCC pin of said pfc circuit and the GATE pin that inserts the pwm pulse generating unit after the VCC control circuit links to each other again; Said VCC control circuit comprises metal-oxide-semiconductor Q1, booster circuit and voltage comparator circuit; The source electrode of said metal-oxide-semiconductor Q1 links to each other with the VCC pin of pfc circuit, inserts booster circuit after said metal-oxide-semiconductor Q1 links to each other with voltage comparator circuit again, and the input of said booster circuit links to each other with the GATE pin of pwm pulse generating unit.
2. the VCC control circuit that is used for LED controllable silicon light modulation power supply pfc circuit according to claim 1; It is characterized in that; Described voltage comparator circuit comprises resistance R 1, voltage-stabiliser tube DZ1; The negative pole of said voltage-stabiliser tube DZ1 links to each other with an end of resistance R 1, and the positive pole of said voltage-stabiliser tube DZ1 links to each other with the grid of metal-oxide-semiconductor Q1, and the other end of said resistance R 1 links to each other with booster circuit.
3. the VCC control circuit that is used for LED controllable silicon light modulation power supply pfc circuit according to claim 2; It is characterized in that; Said booster circuit comprises resistance R 2, resistance R 5, resistance R 8, resistance R 9, capacitor C 3, capacitor C 6, diode D1, diode D3, voltage-stabiliser tube DZ4 and triode Q2; The other end of said resistance R 1 links to each other with the negative pole of voltage-stabiliser tube DZ4, and the negative pole of voltage-stabiliser tube DZ4 links to each other with the negative pole of diode D1, and the negative pole of diode D1 links to each other with an end of capacitor C 3, an end of resistance R 2; The other end of the other end of torch C3, resistance R 2 links to each other with the positive pole of diode D3; The negative pole of diode D3 all links to each other with the positive pole of diode D1, and the anodal of the positive pole of diode D3, voltage-stabiliser tube DZ4 all links to each other with the drain electrode of metal-oxide-semiconductor, and the positive pole of diode D3 links to each other with an end of resistance R 5; The negative pole of diode D3 links to each other with an end of capacitor C 6; The other end of the other end of capacitor C 6, resistance R 5 all links to each other with the collector electrode of triode Q2, inserts the GATE pin of pwm pulse generating unit after the base stage of triode Q2 is connected with resistance R 8, the grounded emitter of triode Q2; One end of resistance R 9 links to each other with the base stage of triode Q2, and the other end of resistance R 9 links to each other with the emitter of triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200986375U CN202488842U (en) | 2012-03-16 | 2012-03-16 | Virtual channel connection (VCC) control circuit for power factor correction (PFC) circuit of light emitting diode (LED) silicon controlled dimming power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200986375U CN202488842U (en) | 2012-03-16 | 2012-03-16 | Virtual channel connection (VCC) control circuit for power factor correction (PFC) circuit of light emitting diode (LED) silicon controlled dimming power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202488842U true CN202488842U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200986375U Expired - Fee Related CN202488842U (en) | 2012-03-16 | 2012-03-16 | Virtual channel connection (VCC) control circuit for power factor correction (PFC) circuit of light emitting diode (LED) silicon controlled dimming power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841704A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
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2012
- 2012-03-16 CN CN2012200986375U patent/CN202488842U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841704A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20140316 |