CN104411053A - Phase-shift processing based LED driving system - Google Patents
Phase-shift processing based LED driving system Download PDFInfo
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- CN104411053A CN104411053A CN201410692716.2A CN201410692716A CN104411053A CN 104411053 A CN104411053 A CN 104411053A CN 201410692716 A CN201410692716 A CN 201410692716A CN 104411053 A CN104411053 A CN 104411053A
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Abstract
The invention discloses a phase-shift processing based LED driving system. The phase-shift processing based LED driving system is characterized by comprising a transformer T, a rectification filter circuit, a phase-shift circuit, a driving circuit and an open-circuit protection circuit, wherein the rectification filter circuit is connected with a secondary side of the transformer T, the phase-shift circuit is connected with the rectification filter circuit, the driving circuit is connected with the phase-shift circuit, and the open-circuit protection circuit is connected with the driving circuit. The phase-shift circuit comprises a phase-shift chip U1, a triode VT1, a triode VT2, a resistor R2, a capacitor C2 and the like, wherein one end of the resistor R2 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R2 is connected with an IN1 pin of the phase-shift chip U1, and a cathode of the capacitor C2 is connected with the IN1 pin of the phase-shift chip U1 after passing by a resistor R1 while an anode of the capacitor C2 is connected with an IN2 pin of the phase-shift chip U1. Compared with the prior art, the phase-shift processing based LED driving system has the advantages that by the aid of the phase-shift circuit, voltage of the driving system can be more stable, and influences of LED lamp flickering on light effects are avoided.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of LED drive system based on phase shift process.
Background technology
High-capacity LED is applied in traffic lights, luminous billboard, street lamp, airfield runway, level crossing, medical/surgical illumination and train signal more and more.Their long service life (high power white LED has 35 usually, the life-span of 000 to 50,000 hour), low in energy consumption.But, can find that in LED use procedure LED has the phenomenon of flicker, affects illuminating effect.
Summary of the invention
The object of the invention is to solve the defect of LED in use procedure appearance flicker, a kind of LED drive system based on phase shift process is provided.
Object of the present invention is by following technical proposals reality: based on the LED drive system of phase shift process; by transformer T; the current rectifying and wave filtering circuit be connected with transformer T secondary; the phase-shift circuit be connected with current rectifying and wave filtering circuit; the drive circuit be connected with phase-shift circuit, and the open loop protection circuit be connected with drive circuit forms.Described phase-shift circuit is by phase shift chip U1, triode VT1, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R2 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R1, the electric capacity C2 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R3, the electric capacity C4 that negative pole is connected with the collector electrode of triode VT1, positive pole is connected with the OUT pin of phase shift chip U1, the electric capacity C3 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R4 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT1, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms, the IN1 pin of described phase shift chip U1 is connected with current rectifying and wave filtering circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R4, the emitter of triode VT1 is connected with the base stage of triode VT2, the collector and emitter of triode VT2 is all connected with drive circuit, and the negative pole of electric capacity C2 is connected with current rectifying and wave filtering circuit.
Further, described current rectifying and wave filtering circuit comprises diode bridge rectifier U and electric capacity C1; Two inputs of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T secondary respectively, the positive and negative electrode of electric capacity C1 is then serially connected between two outputs of diode bridge rectifier U, and being just connected with the IN1 pin of phase shift chip U1 of described electric capacity C1, negative pole are also connected with the negative pole of electric capacity C2.
Described drive circuit is by driving chip U2, triode VT3, the resistance R5 that one end is connected with the base stage of triode VT3, the other end is then connected with the VCC pin of driving chip U2, the resistance R6 that one end is connected with the DIS pin of driving chip U2, the other end is connected with the emitter of triode VT3, the electric capacity C5 that negative pole is connected with the TRI pin of driving chip U2, positive pole is connected with emitter and the open loop protection circuit of triode VT2 simultaneously, and one end is connected with the CONT pin of driving chip U2, the electric capacity C6 of other end ground connection forms; The base stage of described triode VT3 is also connected with the collector electrode of triode VT2, its grounded collector; The THRE pin of driving chip U2 is connected with its DIS pin, and GND pin ground connection, OUT pin is all connected with open loop protection circuit with RESET pin.
Described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT4, N pole is connected with the VDD pin of protect IC U3, the Zener diode D3 that P pole is then connected with the positive pole of electric capacity C5, one end is connected with the N pole of Zener diode D3, the inductance L 1 that the other end is then connected with the drain electrode of field effect transistor Q, one end is connected with the source electrode of field effect transistor Q, the resistance R7 of other end ground connection, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C7 that negative pole is then connected with the collector electrode of triode VT4, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C8 of minus earth, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is connected with the CS pin of protect IC U3, and N pole is connected with the drain electrode of field effect transistor Q, the Zener diode D4 of P pole ground connection forms, the VDD pin of described protect IC U3 is connected with the RESET pin of driving chip U2, its ISET pin is then connected with the OUT pin of driving chip U2, its DRV pin is then connected with the grid of field effect transistor Q, ILIM pin is connected with the base stage of triode VT4 with the source electrode of field effect transistor Q simultaneously, GND pin ground connection.
Described phase shift chip U1 is LM741 integrated chip.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) the present invention is compared with prior art provided with phase-shift circuit, and it can make the voltage of drive system more stable, avoids LED flicker effects illuminating effect.
(2) the present invention adopts its reaction speed of LM741 integrated chip fast, and cheap.
(3) the present invention by the effect of open loop protection circuit make LED the moment of damaging in circuit other electronic component protected, thus avoid secondary damage to bring larger loss.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1; LED drive system based on phase shift process of the present invention; by transformer T; the current rectifying and wave filtering circuit be connected with transformer T secondary; the phase-shift circuit be connected with current rectifying and wave filtering circuit; the drive circuit be connected with phase-shift circuit, and the open loop protection circuit be connected with drive circuit forms.
Wherein, phase-shift circuit is emphasis of the present invention, it is by phase shift chip U1, triode VT1, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R2 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R1, the electric capacity C2 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R3, the electric capacity C4 that negative pole is connected with the collector electrode of triode VT1, positive pole is connected with the OUT pin of phase shift chip U1, the electric capacity C3 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R4 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT1, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms, the IN1 pin of described phase shift chip U1 is connected with current rectifying and wave filtering circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R4, the emitter of triode VT1 is connected with the base stage of triode VT2, the collector and emitter of triode VT2 is all connected with drive circuit, and the negative pole of electric capacity C2 is connected with current rectifying and wave filtering circuit.The voltage of LED drive system can be made more stable by the process of phase-shift circuit, avoid LED to occur the phenomenon of flicker.In order to better implement the present invention, described phase shift chip U1 elects LM741 integrated chip as, and its reaction speed is fast, cheap.
Current rectifying and wave filtering circuit in system can convert applicable smooth-going direct current to civil power and use for LED load.It comprises diode bridge rectifier U and electric capacity C1; Two inputs of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T secondary respectively, the positive and negative electrode of electric capacity C1 is then serially connected between two outputs of diode bridge rectifier U, and being just connected with the IN1 pin of phase shift chip U1 of described electric capacity C1, negative pole are also connected with the negative pole of electric capacity C2.
Drive circuit is by driving chip U2, triode VT3, the resistance R5 that one end is connected with the base stage of triode VT3, the other end is then connected with the VCC pin of driving chip U2, the resistance R6 that one end is connected with the DIS pin of driving chip U2, the other end is connected with the emitter of triode VT3, the electric capacity C5 that negative pole is connected with the TRI pin of driving chip U2, positive pole is connected with emitter and the open loop protection circuit of triode VT2 simultaneously, and one end is connected with the CONT pin of driving chip U2, the electric capacity C6 of other end ground connection forms; The base stage of described triode VT3 is also connected with the collector electrode of triode VT2, its grounded collector; The THRE pin of driving chip U2 is connected with its DIS pin, and GND pin ground connection, OUT pin is all connected with open loop protection circuit with RESET pin.
Described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT4, N pole is connected with the VDD pin of protect IC U3, the Zener diode D3 that P pole is then connected with the positive pole of electric capacity C5, one end is connected with the N pole of Zener diode D3, the inductance L 1 that the other end is then connected with the drain electrode of field effect transistor Q, one end is connected with the source electrode of field effect transistor Q, the resistance R7 of other end ground connection, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C7 that negative pole is then connected with the collector electrode of triode VT4, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C8 of minus earth, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is connected with the CS pin of protect IC U3, and N pole is connected with the drain electrode of field effect transistor Q, the Zener diode D4 of P pole ground connection forms, the VDD pin of described protect IC U3 is connected with the RESET pin of driving chip U2, its ISET pin is then connected with the OUT pin of driving chip U2, its DRV pin is then connected with the grid of field effect transistor Q, ILIM pin is connected with the base stage of triode VT4 with the source electrode of field effect transistor Q simultaneously, GND pin connects, and LED is then serially connected between the positive pole of electric capacity C8 and the CS pin of protect IC U3.In order to improve protected effect and make the antijamming capability of drive system better, protect IC U3 is preferably CN5619 integrated chip.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. based on the LED drive system of phase shift process, it is characterized in that: by transformer T, the current rectifying and wave filtering circuit be connected with transformer T secondary, the phase-shift circuit be connected with current rectifying and wave filtering circuit, the drive circuit be connected with phase-shift circuit, and the open loop protection circuit be connected with drive circuit forms, described phase-shift circuit is by phase shift chip U1, triode VT1, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R2 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R1, the electric capacity C2 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R3, the electric capacity C4 that negative pole is connected with the collector electrode of triode VT1, positive pole is connected with the OUT pin of phase shift chip U1, the electric capacity C3 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R4 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT1, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms, the IN1 pin of described phase shift chip U1 is connected with current rectifying and wave filtering circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R4, the emitter of triode VT1 is connected with the base stage of triode VT2, the collector and emitter of triode VT2 is all connected with drive circuit, and the negative pole of electric capacity C2 is connected with current rectifying and wave filtering circuit.
2. the LED drive system based on phase shift process according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises diode bridge rectifier U and electric capacity C1; Two inputs of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T secondary respectively, the positive and negative electrode of electric capacity C1 is then serially connected between two outputs of diode bridge rectifier U, and being just connected with the IN1 pin of phase shift chip U1 of described electric capacity C1, negative pole are also connected with the negative pole of electric capacity C2.
3. the LED drive system based on phase shift process according to claim 2, it is characterized in that: described drive circuit is by driving chip U2, triode VT3, one end is connected with the base stage of triode VT3, the resistance R5 that the other end is then connected with the VCC pin of driving chip U2, one end is connected with the DIS pin of driving chip U2, the resistance R6 that the other end is connected with the emitter of triode VT3, negative pole is connected with the TRI pin of driving chip U2, the electric capacity C5 that positive pole is connected with emitter and the open loop protection circuit of triode VT2 simultaneously, and one end is connected with the CONT pin of driving chip U2, the electric capacity C6 of other end ground connection forms, the base stage of described triode VT3 is also connected with the collector electrode of triode VT2, its grounded collector, the THRE pin of driving chip U2 is connected with its DIS pin, and GND pin ground connection, OUT pin is all connected with open loop protection circuit with RESET pin.
4. the LED drive system based on phase shift process according to claim 3, it is characterized in that: described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT4, N pole is connected with the VDD pin of protect IC U3, the Zener diode D3 that P pole is then connected with the positive pole of electric capacity C5, one end is connected with the N pole of Zener diode D3, the inductance L 1 that the other end is then connected with the drain electrode of field effect transistor Q, one end is connected with the source electrode of field effect transistor Q, the resistance R7 of other end ground connection, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C7 that negative pole is then connected with the collector electrode of triode VT4, positive pole is connected with the drain electrode of field effect transistor Q, the electric capacity C8 of minus earth, one end is connected with the emitter of triode VT4, the resistance R8 that the other end is connected with the CS pin of protect IC U3, and N pole is connected with the drain electrode of field effect transistor Q, the Zener diode D4 of P pole ground connection forms, the VDD pin of described protect IC U3 is connected with the RESET pin of driving chip U2, its ISET pin is then connected with the OUT pin of driving chip U2, its DRV pin is then connected with the grid of field effect transistor Q, ILIM pin is connected with the base stage of triode VT4 with the source electrode of field effect transistor Q simultaneously, GND pin ground connection.
5. the LED drive system based on phase shift process according to Claims 1 to 4 any one, is characterized in that: described phase shift chip U1 is LM741 integrated chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692716.2A CN104411053A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based LED driving system |
| CN201510307171.3A CN104853509A (en) | 2014-11-26 | 2015-06-06 | Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692716.2A CN104411053A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based LED driving system |
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| CN104411053A true CN104411053A (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410692716.2A Pending CN104411053A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based LED driving system |
| CN201510307171.3A Pending CN104853509A (en) | 2014-11-26 | 2015-06-06 | Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510307171.3A Pending CN104853509A (en) | 2014-11-26 | 2015-06-06 | Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517235A (en) * | 2015-12-23 | 2016-04-20 | 成都雷纳斯科技有限公司 | Constant-current driving circuit-based multifunctional control system for LED lamp |
| CN106550507A (en) * | 2016-11-03 | 2017-03-29 | 中山市荣亮照明有限公司 | LED lighting down lamp |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802573B (en) * | 2019-01-30 | 2020-04-17 | 西安微电子技术研究所 | Magnetic isolation feedback drive circuit based on current type pulse width modulation controller and DC/DC converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201312402Y (en) * | 2008-12-02 | 2009-09-16 | 田冬华 | LED lamp constant current circuit |
| CN102612197B (en) * | 2011-01-20 | 2014-04-02 | 海洋王照明科技股份有限公司 | LED (light emitting diode) driving circuit and LED lamp using same |
| KR101437564B1 (en) * | 2012-01-09 | 2014-09-05 | 김진국 | LED lamp driving device operating connected to the ballast for fluorcent lamp and the LED lamp comprising the driving device. |
| CN203206508U (en) * | 2013-03-25 | 2013-09-18 | 福建省卓珏光电科技有限公司 | Novel LED lamp driving circuit |
-
2014
- 2014-11-26 CN CN201410692716.2A patent/CN104411053A/en active Pending
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2015
- 2015-06-06 CN CN201510307171.3A patent/CN104853509A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517235A (en) * | 2015-12-23 | 2016-04-20 | 成都雷纳斯科技有限公司 | Constant-current driving circuit-based multifunctional control system for LED lamp |
| CN106550507A (en) * | 2016-11-03 | 2017-03-29 | 中山市荣亮照明有限公司 | LED lighting down lamp |
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| Publication number | Publication date |
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| CN104853509A (en) | 2015-08-19 |
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Application publication date: 20150311 |