CN102014557A - LED dimming power supply - Google Patents
LED dimming power supply Download PDFInfo
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- CN102014557A CN102014557A CN201010511642XA CN201010511642A CN102014557A CN 102014557 A CN102014557 A CN 102014557A CN 201010511642X A CN201010511642X A CN 201010511642XA CN 201010511642 A CN201010511642 A CN 201010511642A CN 102014557 A CN102014557 A CN 102014557A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to an LED dimming power supply. The LED dimming power supply comprises an input surge protection circuit, an electro-magnetic interference (EMI) filtering circuit, a bridge rectifier, a passive power factor correction circuit, a line voltage detection circuit, a buck direct current (DC)/direct current (DC) converter circuit and an integrated circuit (IC) control circuit, wherein the input end of the input surge protection circuit receives an input power supply and the output end is connected to the input end of the bridge rectifier through the EMI filtering circuit; the output end of the bridge rectifier is connected to the input end of the IC control circuit through the line voltage detection circuit; a pulse width modulation (PWM) signal output by the IC control circuit is connected to the buck DC/ DC converter circuit; the anode output end of the bridge rectifier is connected to the anode of an LED lamp through a diode D1; and the cathode output end of the bridge rectifier is grounded and is also connected to the cathode of the LED lamp through a buck DC/ DC converter. The LED dimming power supply has the advantages of simple structure, small volume, light weight, low noise, high efficiency and the like.
Description
Technical field
The invention belongs to LED light modulation power supply, relate in particular to the LED light modulation power supply of the traditional TRIAC dimmer of a kind of compatibility.
Background technology
The dimming mode that the Dimmable LED power supply adopts usually has two kinds, i.e. digital PWM light modulation and the light modulation of analog D C voltage.Based on the TRIAC conventional incandescent of phase control and Halogen lamp LED dimmer if be used for the brightness adjustment control of LED, the flicker that can produce 100Hz or 120Hz, and dimming scope is very narrow.The present invention's compatibility standard TRIAC dimmer fully carries out the light modulation of the steady flicker free of wide region to LED, has broken a bottleneck of traditional TRIAC dimmer applications and LED energy-saving illumination.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of simple in structure, volume is little, in light weight, low noise, high-efficiency LED light modulation power supply.
For achieving the above object, technical scheme of the present invention is: a kind of LED light modulation power supply, and it comprises input surge protection circuit, EMI filter circuit, bridge rectifier, passive power factor correcting circuit, line voltage detecting circuit, buck DC/DC converter circuit and IC control circuit;
This input surge protection circuit input end receives the input power supply; its output is connected to the input of bridge rectifier by the EMI filter circuit; this bridge rectifier output is connected to IC control circuit input by the line voltage detecting circuit; IC control circuit output pwm signal is connected to buck DC/DC converter circuit; the bridge rectifier cathode output end is connected to LED lamp positive pole by diode D1; this bridge rectifier cathode output end ground connection, and also be connected to LED lamp negative pole by buck DC/DC converter.
Passive power factor correcting circuit: the line power factor that is used to improve power supply;
Line voltage detecting circuit: the line voltage distribution of rectification is converted to a suitable level is input to the IC test side;
Buck DC/DC converter circuit: will import high pressure and become output low pressure.
This input surge protection circuit comprises fuse, thermistor and piezo-resistance, and an end of this fuse and thermistor all receives the input power supply, and the other end all is connected to the EMI filter circuit, and also is connected with piezo-resistance between the other end.
This EMI filter circuit comprises common mode inductance, first differential mode inductance, second differential mode inductance, first electric capacity, the 3rd resistance and the 4th resistance;
Two inputs of this common mode inductance receive the electric current from the input surge protection circuit; two outputs of this common mode inductance are connected to the input of first differential mode inductance and second differential mode inductance respectively; the output of first differential mode inductance and second differential mode inductance is connected to bridge rectifier; be connected with first electric capacity between two inputs of this common mode inductance; the 3rd resistance and the 4th resistance are connected in parallel to second differential mode inductance and the first differential mode inductance two ends respectively, also are connected with filter unit between the output of first differential mode inductance and second differential mode inductance.
This passive power factor correcting circuit comprises second diode, the 3rd diode, the 4th diode, filter capacitor, the 3rd electric capacity and the 4th electric capacity;
The positive pole of the 4th diode connects the output of bridge rectifier by first diode, the positive pole of the 4th diode is also respectively by resistance and filter capacitor ground connection, the negative pole of the 4th diode connects ground by the 4th electric capacity, the negative pole of the 4th diode also connects ground by the 3rd diode, second diode successively, and the negative pole of the 3rd diode also is connected to the positive pole of the 4th diode by the 3rd electric capacity.
This line voltage detecting circuit comprises the 5th resistance, the 6th resistance, first switching device and voltage-stabiliser tube;
Also by voltage-stabiliser tube ground connection, the first switching device output is connected to the IC control circuit for the control end that the bridge rectifier output is connected to first switching device by the 5th resistance that is connected in parallel and the 6th resistance, the first switching device control end.
This IC control circuit comprises that model is the IC driver of LM3445;
The first switching device output is connected to the BLDR end of IC driver, the first switching device output is connected to IC drive power supply end by the 5th diode and current rectifying and wave filtering circuit, the first switching device output also is connected to the DIM end of IC driver by the 7th diode and the 2nd RC oscillating circuit, and the 7th diode also is connected to ground by the 8th diode, and the GATE end of IC driver is connected to buck DC/DC converter circuit.
This buck DC/DC converter circuit comprises the 6th diode, the 5th electric capacity, the 3rd differential mode inductance, the 4th differential mode inductance, second switch device and triode;
The positive pole of the 6th diode is connected to LED lamp positive pole, the negative pole of the 6th diode is connected to LED lamp negative pole by the 4th inductance, the 3rd inductance, the control end of this second switch device is connected with the GATE end of IC driver, this second switch device is by being connected to LED lamp positive pole with the 4th inductance and the 6th diode, its emitter of triode is connected to LED lamp positive pole by current-limiting resistance, and its collector electrode is connected to the COFF end of IC driver.
Description of drawings
Fig. 1 is the circuit theory diagrams of LED power circuit of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
As shown in Figure 1, the invention discloses a kind of LED light modulation power supply, it is characterized in that, comprise input surge protection circuit, EMI filter circuit, bridge rectifier, passive power factor correcting circuit, line voltage detecting circuit, buck DC/DC converter circuit and IC control circuit;
This input surge protection circuit input end receives the input power supply; its output is connected to the input of bridge rectifier by the EMI filter circuit; this bridge rectifier output is connected to IC control circuit input by the line voltage detecting circuit; IC control circuit output pwm signal is connected to buck DC/DC converter circuit; the bridge rectifier cathode output end is connected to LED lamp positive pole by diode D1; this bridge rectifier cathode output end ground connection, and also be connected to LED lamp negative pole by buck DC/DC converter.
This input surge protection circuit comprises fuse F1, thermistor MF72 and piezo-resistance RV; the end of this fuse F1 and thermistor MF72 all receives the input power supply; the other end all is connected to the EMI filter circuit, and also is connected with piezo-resistance RV between the other end.
This EMI filter circuit comprises common mode inductance L1, the first differential mode inductance L2, the second differential mode inductance L3, first capacitor C 1, the 3rd resistance R 3 and the 4th resistance R 4;
Two inputs of this common mode inductance L1 receive the electric current from the input surge protection circuit; two outputs of this common mode inductance L1 are connected to the input of the first differential mode inductance L2 and the second differential mode inductance L3 respectively; the output of the first differential mode inductance L2 and the second differential mode inductance L3 is connected to bridge rectifier; be connected with first capacitor C 1 between two inputs of this common mode inductance L1; the 3rd resistance R 3 and the 4th resistance R 4 are connected in parallel to the second differential mode inductance L3 and the first differential mode inductance L2 two ends respectively, also are connected with filter unit between the output of the first differential mode inductance L2 and the second differential mode inductance L3.This filter unit is made of resistance R 20 and capacitor C 2 series connection.
The rectifier circuit that this bridge rectifier is made up of four diodes.
This passive power factor correcting circuit comprises the second diode D2, the 3rd diode D3, the 4th diode D4, filter capacitor C13, the 3rd capacitor C 3 and the 4th capacitor C 4;
The positive pole of the 4th diode D4 connects the output of bridge rectifier by the first diode D1, the positive pole of the 4th diode D4 is also by resistance R 8, R9 ground connection, also by filter capacitor C13 ground connection, the negative pole of the 4th diode D4 connects ground by the 4th capacitor C 4, the negative pole of the 4th diode D4 also connects ground by the 3rd diode D3, the second diode D2 successively, and the negative pole of the 3rd diode D3 also is connected to the positive pole of the 4th diode D4 by the 3rd capacitor C 3.Particularly above-mentioned, the positive pole of the 4th diode D4 is connected to the positive pole of the first diode D1, and the negative pole of the first diode D1 is connected to the output of bridge rectifier.
This line voltage detecting circuit comprises the 5th resistance R 5, the 6th resistance R 5S, the first switching device Q1 and voltage-stabiliser tube Z1;
Also by voltage-stabiliser tube Z1 ground connection, the first switching device Q1 output is connected to the IC control circuit for the control end that the bridge rectifier output is connected to the first switching device Q1 by the 5th resistance R 5 that is connected in parallel and the 6th resistance R 5S, the first switching device Q1 control end.Particularly, this first switching device Q1 is a power MOSFET tube.
This IC control circuit comprises that model is the IC driver of LM3445;
The first switching device Q1 output is connected to the BLDR end of IC driver, the first switching device Q1 output also is connected to IC drive power supply end by the 5th diode D5 and current rectifying and wave filtering circuit, the first switching device Q1 output also is connected to the DIM end of IC driver by the 7th diode and the 2nd RC oscillating circuit, and the 7th diode also is connected to ground by the 8th diode, and the GATE end of IC driver is connected to buck DC/DC converter circuit.
Particularly above-mentioned, the RC oscillating circuit is made up of resistance R 13 and capacitor C 6, C7; The first switching device Q1 output is connected to the negative pole of the 5th diode D5, and the positive pole of the 5th diode D5 passes through capacitor C 6, C7 ground connection respectively after connecting resistance R 13, and resistance R 13 also is connected to IC drive power supply end.The 2nd RC oscillating circuit is made up of resistance R 11 and capacitor C 8; Be connected to the negative pole of the 7th diode behind the resistance R 18 of the first switching device Q1 output by being connected in parallel, the R19, the positive pole of the 7th diode is by capacitor C 8 ground connection, the positive pole of the 7th diode also is connected to the DIM end of IC driver by resistance R 11, the positive pole of the 7th diode also connects the negative pole of the 8th diode, the plus earth of the 8th diode.
This buck DC/DC converter circuit comprises the 6th diode D6, the 5th capacitor C 5, the 3rd differential mode inductance L4, the 4th differential mode inductance L5, second switch device Q2 and triode Q4;
The positive pole of the 6th diode D6 is connected to LED lamp positive pole, the negative pole of the 6th diode D6 is connected to LED lamp negative pole by the 4th inductance L 5, the 3rd inductance L 4, the control end of this second switch device Q2 is connected with the GATE of IC driver end, this second switch device Q2 is by being connected to LED lamp positive pole with the 4th inductance L 5 and the 6th diode D6, its emitter of triode Q4 is connected to LED lamp positive pole by current-limiting resistance R10, and its collector electrode is connected to the COFF end of IC driver.
Claims (7)
1. a LED light modulation power supply is characterized in that, comprises input surge protection circuit, EMI filter circuit, bridge rectifier, passive power factor correcting circuit, line voltage detecting circuit, buck DC/DC converter circuit and IC control circuit;
This input surge protection circuit input end receives the input power supply; its output is connected to the input of bridge rectifier by the EMI filter circuit; this bridge rectifier output is connected to IC control circuit input by the line voltage detecting circuit; IC control circuit output pwm signal is connected to buck DC/DC converter circuit; the bridge rectifier cathode output end is connected to LED lamp positive pole by diode D1; this bridge rectifier cathode output end ground connection, and also be connected to LED lamp negative pole by buck DC/DC converter.
2. LED light modulation power supply according to claim 1; it is characterized in that; this input surge protection circuit comprises fuse (F1), thermistor (MF72) and piezo-resistance (RV); this fuse (F1) all receives the input power supply with an end of thermistor (MF72); the other end all is connected to the EMI filter circuit, and also is connected with piezo-resistance (RV) between the other end.
3. LED light modulation power supply according to claim 1, it is characterized in that this EMI filter circuit comprises common mode inductance (L1), first differential mode inductance (L2), second differential mode inductance (L3), first electric capacity (C1), the 3rd resistance (R3) and the 4th resistance (R4);
Two inputs of this common mode inductance (L1) receive the electric current from the input surge protection circuit; two outputs of this common mode inductance (L1) are connected to the input of first differential mode inductance (L2) and second differential mode inductance (L3) respectively; first differential mode inductance (L2) is connected to bridge rectifier with the output of second differential mode inductance (L3); be connected with first electric capacity (C1) between two inputs of this common mode inductance (L1); the 3rd resistance (R3) is connected in parallel to second differential mode inductance (L3) and first differential mode inductance (L2) two ends respectively with the 4th resistance (R4), also is connected with filter unit between the output of first differential mode inductance (L2) and second differential mode inductance (L3).
4. LED light modulation power supply according to claim 1, it is characterized in that this passive power factor correcting circuit comprises second diode (D2), the 3rd diode (D3), the 4th diode (D4), filter capacitor (C13), the 3rd electric capacity (C3) and the 4th electric capacity (C4);
The positive pole of the 4th diode (D4) connects the output of bridge rectifier by first diode (D1), the positive pole of the 4th diode (D4) is also respectively by resistance (R8, R9) and filter capacitor (C13) ground connection, the negative pole of the 4th diode (D4) connects ground by the 4th electric capacity (C4), the negative pole of the 4th diode (D4) also connects ground by the 3rd diode (D3), second diode (D2) successively, and the negative pole of the 3rd diode (D3) also is connected to the positive pole of the 4th diode (D4) by the 3rd electric capacity (C3).
5. LED light modulation power supply according to claim 1 is characterized in that, this line voltage detecting circuit comprises the 5th resistance (R5), the 6th resistance (R5S), first switching device (Q1) and voltage-stabiliser tube (Z1);
The bridge rectifier output is connected to the control end of first switching device (Q1) by the 5th resistance (R5) that is connected in parallel and the 6th resistance (R5S), also by voltage-stabiliser tube (Z1) ground connection, first switching device (Q1) output is connected to the IC control circuit to first switching device (Q1) control end.
6. LED light modulation power supply according to claim 5 is characterized in that, this IC control circuit comprises that model is the IC driver of LM3445;
First switching device (Q1) output is connected to the BLDR end of IC driver, first switching device (Q1) output is connected to IC drive power supply end by the 5th diode (D5) and current rectifying and wave filtering circuit, first switching device (Q1) output also is connected to the DIM end of IC driver by the 7th diode and second filter circuit, and the 7th diode also is connected to ground by the 8th diode, and the GATE end of IC driver is connected to buck DC/DC converter circuit.
7. LED light modulation power supply according to claim 6 is characterized in that, this buck DC/DC converter circuit comprises the 6th diode (D6), the 3rd inductance (L4), the 4th inductance (L5), second switch device (Q2) and triode (Q4);
The positive pole of the 6th diode (D6) is connected to LED lamp positive pole, the negative pole of the 6th diode (D6) is connected to LED lamp negative pole by the 4th inductance (L5), the 3rd inductance (L4), the control end of this second switch device (Q2) is connected with the GATE of IC driver end, this second switch device (Q2) is by being connected to LED lamp positive pole with the 4th inductance (L5) and the 6th diode (D6), its emitter of triode (Q4) is connected to LED lamp positive pole by current-limiting resistance (R10), and its collector electrode is connected to the COFF end of IC driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010511642XA CN102014557A (en) | 2010-10-19 | 2010-10-19 | LED dimming power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010511642XA CN102014557A (en) | 2010-10-19 | 2010-10-19 | LED dimming power supply |
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| CN102014557A true CN102014557A (en) | 2011-04-13 |
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| CN201010511642XA Pending CN102014557A (en) | 2010-10-19 | 2010-10-19 | LED dimming power supply |
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Cited By (12)
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| CN102665362A (en) * | 2012-05-28 | 2012-09-12 | 济南九恒实业有限公司 | Earthing type protective infrared human-sensing LED smart lamp |
| CN102752909A (en) * | 2011-04-19 | 2012-10-24 | 松下电器产业株式会社 | Power Supply |
| CN103078308A (en) * | 2012-12-28 | 2013-05-01 | 惠州市经典照明电器有限公司 | Surge absorbing circuit of LED (Light Emitting Diode) power supply |
| CN103391669A (en) * | 2013-07-02 | 2013-11-13 | 深圳桑达百利电器有限公司 | LED (light emitting diode) lamp lighting system |
| CN103427675A (en) * | 2012-05-21 | 2013-12-04 | 施耐德电气东南亚(总部)有限公司 | Converter for converting alternating current into direct current |
| CN103687210A (en) * | 2013-11-29 | 2014-03-26 | 孙爱玲 | LED buck-type control circuit |
| CN103779859A (en) * | 2013-12-31 | 2014-05-07 | 宁波三星电气股份有限公司 | Protective circuit for surge voltage of electrical network |
| CN104754832A (en) * | 2015-03-30 | 2015-07-01 | 昂宝电子（上海）有限公司 | Led drive circuit and led lamp |
| CN105451409A (en) * | 2014-09-29 | 2016-03-30 | 惠州Tcl照明电器有限公司 | Straight tube LED power supply compatible with inductance/electronic ballast |
| CN110797853A (en) * | 2019-11-21 | 2020-02-14 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
| CN112616223A (en) * | 2020-12-31 | 2021-04-06 | 珠海雷特科技股份有限公司 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
| CN114172117A (en) * | 2021-12-09 | 2022-03-11 | 华荣科技股份有限公司 | Anti-electric shock double-protection constant current source rectifying circuit |
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Cited By (17)
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| CN102752909B (en) * | 2011-04-19 | 2015-01-07 | 松下电器产业株式会社 | Power Supply |
| CN102752909A (en) * | 2011-04-19 | 2012-10-24 | 松下电器产业株式会社 | Power Supply |
| CN103427675A (en) * | 2012-05-21 | 2013-12-04 | 施耐德电气东南亚(总部)有限公司 | Converter for converting alternating current into direct current |
| CN102665362A (en) * | 2012-05-28 | 2012-09-12 | 济南九恒实业有限公司 | Earthing type protective infrared human-sensing LED smart lamp |
| CN102665362B (en) * | 2012-05-28 | 2014-04-09 | 济南九恒实业有限公司 | Earthing type protective infrared human-sensing LED smart lamp |
| CN103078308A (en) * | 2012-12-28 | 2013-05-01 | 惠州市经典照明电器有限公司 | Surge absorbing circuit of LED (Light Emitting Diode) power supply |
| CN103391669A (en) * | 2013-07-02 | 2013-11-13 | 深圳桑达百利电器有限公司 | LED (light emitting diode) lamp lighting system |
| CN103687210A (en) * | 2013-11-29 | 2014-03-26 | 孙爱玲 | LED buck-type control circuit |
| CN103779859A (en) * | 2013-12-31 | 2014-05-07 | 宁波三星电气股份有限公司 | Protective circuit for surge voltage of electrical network |
| CN105451409B (en) * | 2014-09-29 | 2018-07-24 | 惠州Tcl照明电器有限公司 | The straight tube LED power of compatible inductance, electric ballast |
| CN105451409A (en) * | 2014-09-29 | 2016-03-30 | 惠州Tcl照明电器有限公司 | Straight tube LED power supply compatible with inductance/electronic ballast |
| CN104754832A (en) * | 2015-03-30 | 2015-07-01 | 昂宝电子（上海）有限公司 | Led drive circuit and led lamp |
| CN109496028A (en) * | 2015-03-30 | 2019-03-19 | 昂宝电子（上海）有限公司 | LED drive circuit and LED lamp |
| CN110797853A (en) * | 2019-11-21 | 2020-02-14 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
| CN110797853B (en) * | 2019-11-21 | 2021-12-07 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
| CN112616223A (en) * | 2020-12-31 | 2021-04-06 | 珠海雷特科技股份有限公司 | Silicon controlled rectifier dimming power supply and filter circuit thereof |
| CN114172117A (en) * | 2021-12-09 | 2022-03-11 | 华荣科技股份有限公司 | Anti-electric shock double-protection constant current source rectifying circuit |
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Application publication date: 20110413 |