CN204157102U - A kind of isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit - Google Patents
A kind of isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit Download PDFInfo
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- CN204157102U CN204157102U CN201420449286.7U CN201420449286U CN204157102U CN 204157102 U CN204157102 U CN 204157102U CN 201420449286 U CN201420449286 U CN 201420449286U CN 204157102 U CN204157102 U CN 204157102U
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Abstract
The utility model embodiment discloses the isolated single-stage PFC of a kind of flyback and TRIAC Dimmable LED drive circuit, includes TRIAC dimmer, passive leadage circuit, active damping circuit, the first output rectifier and filter, the second output rectifier and filter, unloaded overvoltage crowbar, the first common mode choke, the second common mode choke, RDC clamp circuit, on-off controller, high frequency transformer.Adopt LED drive circuit of the present utility model can be operated in continuous conducting state, output voltage reaches world security electrician value, accurate < ± 3% continuity of constant current output, and optocoupler can not be adopted to realize the isolation of primary and secondary limit, and realize high precision electro current control.
Description
Technical field
The utility model relates to a kind of LED drive circuit, particularly relates to the isolated single-stage PFC of a kind of flyback and TRIAC Dimmable LED drive circuit.
Background technology
LED has the advantages such as energy-conservation, long service life, driving voltage are low, is a kind of new green environment protection light source, is widely used among the various occasions such as reading lamp, flashlight, headlight for vehicles, baby spot, label, dome illumination, decoration bright lamp.
The LED drive circuit applied at present, in order to comparatively high control precision, the isolation of primary and secondary limit realizing electric current have employed optocoupler, adds use cost, and does not adopt its circuit output current control precision of optocoupler circuit poor.
Summary of the invention
The utility model embodiment technical problem to be solved is, provides the isolated single-stage PFC of a kind of flyback and TRIAC Dimmable LED drive circuit.The isolation of primary and secondary limit can be realized, and realize high precision electro current control.
In order to solve the problems of the technologies described above, the utility model embodiment provides the isolated single-stage PFC of a kind of flyback and TRIAC Dimmable LED drive circuit, comprises the TRIAC dimmer be serially connected with on power input, is connected to the first common mode choke of described TRIAC dimmer rear class, carries out the rectifier of rectification, the second common mode choke be connected on described rectifier output end, RDC clamp circuit, on-off controller, high frequency transformer to the electric current through described first common mode choke filtering;
Described on-off controller has peak value input, be connected the output of described second common mode choke with resistance by the first diode VD2, described RDC clamp circuit is connected on the output of described second common mode choke after being connected in series with the drain electrode of the inner MOSFET of described on-off controller by the second diode VD4, and the armature winding of described high frequency transformer and described RDC clamp circuit also connect;
Described armature winding transfers energy to secondary winding, feedback winding, and the output voltage of described secondary winding is through the first output rectifier and filter output dc voltage signal; The output voltage of described feedback winding is through the second output rectifier and filter output dc voltage signal and accessed the bypass input end of described on-off controller by the first resistance R17 and the 3rd diode VD5, described bypass input end connects described rectifier negative output terminal by the first electric capacity C7, and described second output rectifier and filter output dc voltage signal accesses the feedback input end of described on-off controller by the second resistance R18.
Further, also comprise the passive leadage circuit being connected to described TRIAC dimmer rear class, be connected in series by RC device and form, between described passive leadage circuit and described TRIAC dimmer, be serially connected with fuse.
Further, also comprise the active damping circuit being connected to described second common mode choke prime, comprise the first triode VT1, field effect transistor, be connected to the first divider resistance on the output of described rectifier, second divider resistance, the base stage of described first triode obtains conducting voltage from described second divider resistance, emitter connects base stage by the 4th diode VD1, the second electric capacity C2 is met between collector electrode and emitter, the G pole of described field effect transistor connects the emitter of described first triode, the S pole of described field effect transistor and D pole are connected across on the current-limiting resistance R10 two ends that are serially connected on the end of described rectifier loop.
Further; also comprise unloaded overvoltage crowbar; it comprises the second triode VT2, the 4th diode VD8, voltage-stabiliser tube diode VDZ2; described 4th diode VD8, described voltage-stabiliser tube diode VDZ2, pull-up resistor R20 are serially connected with on the output of described feedback winding, and the base stage of described second triode VT2 obtains conducting voltage from described pull-up resistor.
Further, on described first common mode choke, the second common mode choke one lateral coil respectively and be connected to damping resistance R5, R10.
Further, the output of described second common mode choke is connected to discharge resistance R12, storage capacitor C5, described storage capacitor C5 connects described first diode VD2.
Further, the negative terminal of described secondary winding, feedback winding is connected by protection electric capacity C15.
Implement the utility model embodiment, there is following beneficial effect: LED drive circuit of the present utility model can be operated in continuous conducting state, output voltage reaches world security electrician value, accurate < ± 3% continuity of constant current output, and optocoupler can not be adopted to realize the isolation of primary and secondary limit, and realize high precision electro current control.
Accompanying drawing explanation
Fig. 1 is the overall structure signal of the utility model circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
With reference to the overall structure schematic diagram of the present utility model described in Fig. 1.
The isolated single-stage PFC of a kind of flyback of the utility model embodiment and TRIAC Dimmable LED drive circuit, include TRIAC dimmer, passive leadage circuit, active damping circuit, the first output rectifier and filter, the second output rectifier and filter, unloaded overvoltage crowbar, the first common mode choke, the second common mode choke, RDC clamp circuit, on-off controller, high frequency transformer.
TRIAC dimmer is connected on AC input wiring terminal, and passive leadage circuit is connected in series by RC device and forms, and the present embodiment is particularly made up of C1 and R1-R4, and it is positioned at the rear class of fuse.When TRIAC dimmer is to during LED during row light modulation, the audio-frequency noise reduced to greatest extent because surge current is produced by the first common mode choke L1 can be reached.
First common mode choke L1 is connected in passive leadage circuit rear class, carries out rectification by rectifier BR1 to its filtered electric current, and the second common mode choke L2 is connected on the output of rectifier BR1.
Between rectifier BR1 and the second common mode choke L2, active antihunt circuit is set, comprise the first triode VT1, field effect transistor, be connected to the first divider resistance R6 on the output of rectifier BR1, R7, second divider resistance R8, the base stage of the first triode VT1 obtains conducting voltage from the second divider resistance R8, emitter connects base stage by the 4th diode VD1, the second electric capacity C2 is met between collector electrode and emitter, the G pole of described field effect transistor connects the emitter of described first triode VT1 by resistance R9, the S pole of described field effect transistor and D pole are connected across on the current-limiting resistance R10 two ends that are serially connected on the end of described rectifier loop, voltage stabilizing didoe VDZ1 is connected with between the S pole of field effect transistor and G pole, just grid voltage clamper.Active damping circuit is for avoiding because there is inductance and electric capacity in circuit and the attenuated oscillation caused.
Second common mode choke L2 is connected to the rear class of active damping circuit, EMI filtering is formed by first, second common mode choke L1, L2 and electric capacity C3, C4, and the output of the first common mode choke L1 is connected to AC varistor RV, for absorbing surge voltage.
On first common mode choke L1, the second common mode choke L2 mono-lateral coil respectively and be connected to damping resistance R5, R10, prevent electromagnetic interface filter from producing resonance for suppressing.
On-off controller U1 has peak value input, be connected the output of described second common mode choke with resistance R13, R14 by the first diode VD2, RDC clamp circuit is connected on the output of the second common mode choke L2 after being connected in series by the drain electrode of the inner MOSFET of the second diode VD4 and on-off controller, and the armature winding of high frequency transformer T and described RDC clamp circuit also connect.
First diode VD2, resistance R13, R14 form peak detector, the electric current flowing through R13, R14 is exactly peak sample electric current, U1 and the sexual intercourse of load LED retention wire can be made by R13, R14, also eliminate LED neutral line distributed capacitance, thus LED dimming scope is increased.C5 is eliminated noise electric capacity, and R12 provides discharge loop for C5.U1, according to the size of peak sample electric current and feedback end input current, carrys out the average current value of control LED.During TRIAC phase dimming pattern, between R end and S are held (i.e. R16 set resistance value), under voltage and overvoltage threshold value in circuit.
RDC clamp circuit is connected in series by diode VD3, electric capacity C6 and forms, and electric capacity C6 is connected to bleeder resistance R15.
The armature winding of high frequency transformer T transfers energy to secondary winding, feedback winding, the output voltage of secondary winding is through the first output rectifier and filter output dc voltage signal, first output rectifier and filter is made up of the diode VD6 be serially connected with on output and filter capacitor C11, C12, and the output of filtering meets dummy load R22.
The output voltage of feedback winding also accesses the bypass input end BP of on-off controller U1 by the first resistance R17 and the 3rd diode VD5 through the second output rectifier and filter output dc voltage signal.The output series resistor R23 of the second output rectifier and filter, diode VD7, and be connected to filter capacitor C13, C14.
The negative terminal of secondary winding, feedback winding is connected by protection electric capacity C15.
The bypass input end BP of on-off controller U1 connects power supply negative terminal by the first electric capacity C7.C7 is the shunt capacitance of BP end.Make direct ratio for biased winding voltage and output voltage, therefore do not need secondary light-metering lotus root feedback circuit, on-off controller U1 is that LYT4314E just can according to feedback end electric current, and voltage monitoring end current information, realizes constant current output.
Second output rectifier and filter output dc voltage signal accesses the feedback input end of on-off controller U1 by the second resistance R18.
Unloaded overvoltage crowbar comprises the second triode VT2, the 4th diode VD8, voltage-stabiliser tube diode VDZ2; 4th diode VD8, pressure pipe diode VDZ2, resistance R20 are serially connected with on the output of feedback winding successively, and the base stage of the second triode VT2 obtains conducting voltage by resistance R19 from pull-up resistor R20.
When TRIAC just starts conducting, R10 plays damping action to surge current, effectively controls the climbing reducing surge current, also effectively inhibits MOSFET to produce vibration.Along with VD1 charges to C2, the grid potential of field effect transistor constantly raises, and ability conducting after approximately passing through IMS also by R10 short circuit, allows larger surge current to pass through.When the triac is conductive, IMS delay circuit is formed by R6-R8 and C2.When TRIAC turns off, C2 is discharged by VT1.The effect of voltage-stabiliser tube VDZ2 is by grid voltage clamper.The resistance that only need increase R6, R7 can postpone the ON time of VD1, can adapt to the needs of multiple TRIAC dimmer.
When unloaded bias voltage is once rising, immediately by voltage-stabiliser tube VDZ2 reverse breakdown, makes VT2 conducting, bypass is carried out to feedback current, feedback current is reduced rapidly.When feedback current is lower than set point, IC will move by autoboot, and output and bias voltage are reduced rapidly.
When LED load disconnects suddenly, U1 enters autoboot dynamic model formula immediately, and now VT2 conducting arranges overvoltage threshold value by voltage-stabiliser tube VDZ2.
Above disclosedly be only a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (7)
1. the isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit, it is characterized in that, comprise the TRIAC dimmer be serially connected with on power input, be connected to described TRIAC dimmer rear class the first common mode choke, the rectifier of rectification, the second common mode choke be connected on described rectifier output end, RDC clamp circuit, on-off controller, high frequency transformer are carried out to the electric current through described first common mode choke filtering;
Described on-off controller has peak value input, be connected the output of described second common mode choke with resistance by the first diode VD2, described RDC clamp circuit is connected on the output of described second common mode choke after being connected in series with the drain electrode of the inner MOSFET of described on-off controller by the second diode VD4, and the armature winding of described high frequency transformer and described RDC clamp circuit also connect;
Described armature winding transfers energy to secondary winding, feedback winding, and the output voltage of described secondary winding is through the first output rectifier and filter output dc voltage signal; The output voltage of described feedback winding is through the second output rectifier and filter output dc voltage signal and accessed the bypass input end of described on-off controller by the first resistance R17 and the 3rd diode VD5, described bypass input end connects described rectifier negative output terminal by the first electric capacity C7, and described second output rectifier and filter output dc voltage signal accesses the feedback input end of described on-off controller by the second resistance R18.
2. LED drive circuit according to claim 1, is characterized in that, also comprises the passive leadage circuit being connected to described TRIAC dimmer rear class, is connected in series and forms, be serially connected with fuse between described passive leadage circuit and described TRIAC dimmer by RC device.
3. LED drive circuit according to claim 1, it is characterized in that, also comprise the active damping circuit being connected to described second common mode choke prime, comprise the first triode VT1, field effect transistor, be connected to the first divider resistance on the output of described rectifier, second divider resistance, the base stage of described first triode obtains conducting voltage from described second divider resistance, emitter connects base stage by the 4th diode VD1, the second electric capacity C2 is met between collector electrode and emitter, the G pole of described field effect transistor connects the emitter of described first triode, the S pole of described field effect transistor and D pole are connected across on the current-limiting resistance R10 two ends that are serially connected on the end of described rectifier loop.
4. LED drive circuit according to claim 1; it is characterized in that; also comprise unloaded overvoltage crowbar; it comprises the second triode VT2, the 4th diode VD8, voltage-stabiliser tube diode VDZ2; described 4th diode VD8, described voltage-stabiliser tube diode VDZ2, pull-up resistor R20 are serially connected with on the output of described feedback winding, and the base stage of described second triode VT2 obtains conducting voltage from described pull-up resistor.
5. LED drive circuit according to claim 1, is characterized in that, on described first common mode choke, the second common mode choke one lateral coil respectively and be connected to damping resistance R5, R10.
6. LED drive circuit according to claim 1, is characterized in that, the output of described second common mode choke is connected to discharge resistance R12, storage capacitor C5, and described storage capacitor C5 connects described first diode VD2.
7. LED drive circuit according to claim 1, is characterized in that, the negative terminal of described secondary winding, feedback winding is connected by protection electric capacity C15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420449286.7U CN204157102U (en) | 2014-08-11 | 2014-08-11 | A kind of isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420449286.7U CN204157102U (en) | 2014-08-11 | 2014-08-11 | A kind of isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit |
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| CN204157102U true CN204157102U (en) | 2015-02-11 |
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| CN201420449286.7U Expired - Fee Related CN204157102U (en) | 2014-08-11 | 2014-08-11 | A kind of isolated single-stage PFC of flyback and TRIAC Dimmable LED drive circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244514A (en) * | 2014-08-11 | 2014-12-24 | 广东良得光电科技有限公司 | Fly-back isolation type single-stage PFC and TRIAC dimmable LED drive circuit |
| CN105007668A (en) * | 2015-07-31 | 2015-10-28 | 广东南能汇智节能科技有限公司 | Led dimming system |
| CN105007667A (en) * | 2015-07-31 | 2015-10-28 | 广东南能汇智节能科技有限公司 | LED dimming circuit |
| CN105025636A (en) * | 2015-07-31 | 2015-11-04 | 广东南能汇智节能科技有限公司 | Light-emitting diode (LED) dimming circuit |
| CN105072750A (en) * | 2015-07-31 | 2015-11-18 | 广东南能汇智节能科技有限公司 | Light-emitting diode (LED) dimming system |
| CN112730592A (en) * | 2020-12-28 | 2021-04-30 | 上海新漫传感科技有限公司 | Gas detection system device and detection method thereof |
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2014
- 2014-08-11 CN CN201420449286.7U patent/CN204157102U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244514A (en) * | 2014-08-11 | 2014-12-24 | 广东良得光电科技有限公司 | Fly-back isolation type single-stage PFC and TRIAC dimmable LED drive circuit |
| CN105007668A (en) * | 2015-07-31 | 2015-10-28 | 广东南能汇智节能科技有限公司 | Led dimming system |
| CN105007667A (en) * | 2015-07-31 | 2015-10-28 | 广东南能汇智节能科技有限公司 | LED dimming circuit |
| CN105025636A (en) * | 2015-07-31 | 2015-11-04 | 广东南能汇智节能科技有限公司 | Light-emitting diode (LED) dimming circuit |
| CN105072750A (en) * | 2015-07-31 | 2015-11-18 | 广东南能汇智节能科技有限公司 | Light-emitting diode (LED) dimming system |
| CN105007668B (en) * | 2015-07-31 | 2017-07-21 | 广东南能汇智节能科技有限公司 | LED light adjusting systems |
| CN105025636B (en) * | 2015-07-31 | 2017-11-10 | 广东南能汇智节能科技有限公司 | LED light adjusting circuits |
| CN105072750B (en) * | 2015-07-31 | 2017-11-10 | 广东南能汇智节能科技有限公司 | LED light adjusting systems |
| CN112730592A (en) * | 2020-12-28 | 2021-04-30 | 上海新漫传感科技有限公司 | Gas detection system device and detection method thereof |
| CN112730592B (en) * | 2020-12-28 | 2023-03-31 | 上海新漫传感科技有限公司 | Gas detection system device and detection method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20210811 |
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| CF01 | Termination of patent right due to non-payment of annual fee |