CN104853509A - Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit - Google Patents
Phase shift type LED driving system based on capacitance feedback three-point type oscillation circuit Download PDFInfo
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- CN104853509A CN104853509A CN201510307171.3A CN201510307171A CN104853509A CN 104853509 A CN104853509 A CN 104853509A CN 201510307171 A CN201510307171 A CN 201510307171A CN 104853509 A CN104853509 A CN 104853509A
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Abstract
The invention discloses a phase shift type LED driving system based on a capacitance feedback three-point type oscillation circuit. The system is composed of a transformer T, a rectification filtering circuit connected with the secondary winding of the transformer T, a phase shift circuit connected with the rectification filtering circuit, a driving circuit connected with the phase shift circuit, and an open-circuit protection circuit connected with the driving circuit, and is characterized in that the capacitance feedback three-point type oscillation circuit is also connected in series between the phase shift circuit and the driving circuit. According to the invention, through the effect of the capacitance feedback three-point type oscillation circuit, the driving frequency of the LED driving system can be more stable, and the illumination effect of an LED lamp is ensured.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of phase shift LED drive system based on capacitive feedback bikini oscillating circuit
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, because of its drive system unstable properties in LED use procedure, thus LED can be caused to have the existing picture of flicker, affect illuminating effect.
Summary of the invention
The object of the invention is to the defect solving its drive system unstable properties of LED, a kind of phase shift LED drive system based on capacitive feedback bikini oscillating circuit is provided.
Object of the present invention is by following technical proposals reality: based on the phase shift LED drive system of capacitive feedback bikini oscillating circuit; it is 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; the open loop protection circuit be connected with drive circuit, and be serially connected in the capacitive feedback bikini oscillating circuit composition between phase-shift circuit and drive circuit.
Further, described capacitive feedback bikini oscillating circuit is by triode VT5, triode VT6, N pole is connected with the collector electrode of triode VT5, the diode D5 that P pole is then connected with phase-shift circuit, one end is connected with the P pole of diode D5, the resistance R9 that the other end is then connected with the base stage of triode VT5, positive pole is connected with the collector electrode of triode VT6 after oscillator X, the polar capacitor C10 of minus earth, one end is connected with the emitter of triode VT5, the resistance R10 that the other end is then connected with the negative pole of polar capacitor C10 after resistance R11, positive pole is connected with the emitter of triode VT5, the polar capacitor C9 that negative pole is then connected with the collector electrode of triode VT6, the controllable impedance L2 be in parallel with polar capacitor C9, N pole is connected with the emitter of triode VT5, the diode D6 that P pole is then connected with the negative pole of polar capacitor C10 after resistance R12, and positive pole is connected with the emitter of triode VT6, the polar capacitor C11 that negative pole is then connected with the negative pole of polar capacitor C10 forms, connect 15V voltage while the emitter of described triode VT5 is connected with drive circuit, its collector electrode is then connected with the tie point of resistance R11 with resistance R10, the base stage of described triode VT6 is then connected with the collector electrode of triode VT5, its emitter is then connected with the P pole of diode D6.
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 electrode of triode VT2 is connected with the emitter of drive circuit and triode VT5 respectively, its emitter is then all connected with the P pole of drive circuit and diode D5, and the negative pole of electric capacity C2 is connected with current rectifying and wave filtering circuit.
Described current rectifying and wave filtering circuit comprises diode bridge rectifier U and electric capacity C1; Between the Same Name of Ends that the input of diode bridge rectifier U is serially connected in transformer T secondary and non-same polarity, between the cathode output end that the positive and negative pole of electric capacity C1 is then serially connected in diode bridge rectifier U and cathode output end, 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; The former limit of described transformer T is then as the input of system.
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 and the emitter of triode VT5 respectively, its grounded collector; The THRE pin of described driving chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is all connected with open loop protection circuit with RESET pin; The positive pole of described polar capacitor C5 is also connected with the P pole of diode D5.
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.
Better make effect to reach, described phase shift chip U1 is preferably LM741 integrated chip, and described driving chip U2 is then preferably NE555 integrated chip, and protect IC U3 is then preferably CN5619 integrated chip and realizes.
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.
(4) the present invention is by the effect of capacitive feedback bikini oscillating circuit, the driving frequency of LED drive system can be used more stable, guarantee the illuminating effect of LED.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is capacitive feedback bikini oscillating circuit structural representation 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; the present invention its 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; the open loop protection circuit be connected with drive circuit, and be serially connected in the capacitive feedback bikini oscillating circuit 6 part composition between phase-shift circuit and drive circuit.
Wherein, phase-shift circuit comprises phase shift chip U1, triode VT1, triode VT2, the resistance R2 that one end is connected with the VCC+ pin of phase shift chip U1, the other end is connected with the IN1 pin of phase shift chip U1, the electric capacity C2 that negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R1, positive pole is connected with the IN2 pin of phase shift chip U1, the electric capacity C4 that positive pole is connected with the NC pin of phase shift chip U1 after resistance R3, 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.
In order to reach the implementation result of expection, this phase-shift circuit also includes the potentiometer R4 that one end is connected with the OUT pin of phase shift chip U1, the other end is connected with the collector electrode of triode VT2, the diode D1 that P pole is connected with the OFF1 pin of phase shift chip U1, N pole is connected with the base stage of triode VT1, and the diode D2 that P pole is connected with the OFF2 pin of phase shift chip U1, N pole is connected with the emitter of triode VT2.
It is when connecting, and the IN1 pin of this phase shift chip U1 needs to be connected with current rectifying and wave filtering circuit, to receive the smooth-going direct current after current rectifying and wave filtering circuit process.Meanwhile, the VCC-pin then ground connection of this phase shift chip U1, then can carry out ground protection to the present invention thus.The OUT pin of phase shift chip U1 is then connected with the sliding end of potentiometer R4, then can adjust the voltage that this phase shift chip U1 exports as slide potentiometer R4.
In addition, the emitter of triode VT1 is connected with the base stage of triode VT2, and the collector and emitter of triode VT2 is connected with drive circuit and capacitive feedback bikini oscillating circuit respectively, 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 existing picture of flicker.In order to better implement the present invention, described phase shift chip U1 elects LM741 integrated chip as to realize, and this model integrated chip 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; Between the Same Name of Ends that the input of diode bridge rectifier U is serially connected in transformer T secondary and non-same polarity, between the cathode output end that the positive and negative pole of electric capacity C1 is then serially connected in diode bridge rectifier U and cathode output end, 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.The former limit of this transformer T is then as input of the present invention.
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.
During connection, the base stage of this triode VT3 is connected with the collector electrode of triode VT2 and capacitive feedback bikini oscillating circuit respectively, its grounded collector.And the THRE pin of driving chip U2 is connected with its DIS pin, GND pin ground connection, OUT pin is all connected with open loop protection circuit with RESET pin.Meanwhile, the positive pole of this polar capacitor C5 also needs to be connected with capacitive feedback bikini oscillating circuit.In order to reach better implementation result, this driving chip U2 preferentially adopts NE555 integrated chip to realize.
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.
During connection; the VDD pin of this 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 then can better protect the present invention thus.
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 antijamming capability of the present invention better, protect IC U3 is preferably CN5619 integrated chip to realize.
Capacitive feedback bikini oscillating circuit is then emphasis place of the present invention, and as shown in Figure 2, it is by triode VT5, triode VT6, resistance R9, resistance R10, resistance R11, resistance R12, polar capacitor C10, polar capacitor C11, polar capacitor C9, diode D5, diode D6, controllable impedance L2 and oscillator X form.
During connection, the N pole of this diode D5 is connected with the collector electrode of triode VT5, its P pole is then connected with the emitter of triode VT2, one end of resistance R9 is connected with the P pole of diode D5, its other end is then connected with the base stage of triode VT5, the positive pole of polar capacitor C10 is connected with the collector electrode of triode VT6 after oscillator X, its minus earth, and one end of resistance R10 is connected with the emitter of triode VT5, its other end is then connected with the negative pole of polar capacitor C10 after resistance R11.
Simultaneously, the positive pole of polar capacitor C9 is connected with the emitter of triode VT5, its negative pole is then connected with the collector electrode of triode VT6, controllable impedance L2 is then in parallel with polar capacitor C9, diode D6N pole is connected with the emitter of triode VT5, its P pole is then connected with the negative pole of polar capacitor C10 after resistance R12, and the positive pole of polar capacitor C11 is connected with the emitter of triode VT6, its negative pole is then connected with the negative pole of polar capacitor C10.
Connect 15V voltage while the emitter of described triode VT5 is connected with the base stage of triode VT3, its collector electrode is then connected with the tie point of resistance R11 with resistance R10.The base stage of described triode VT6 is then connected with the collector electrode of triode VT5, its emitter is then connected with the P pole of diode D6.
Wherein, resistance R9 is divider resistance, and it can carry out overvoltage protection to circuit.This triode VT6 is parallel resonance state, and its resonance characteristic then can make oscillator X have stable operating frequency.Resistance R10 and resistance R11 and resistance R12 is then biasing resistor, and the bias current of its adjustable triode VT6 base stage, makes it meet job requirement.Meanwhile, polar capacitor C9 and controllable impedance L2 then forms LC loop, and the oscillation intensity of oscillator X depends on this LC loop, then can regulate the oscillation intensity of oscillator X when regulating controllable impedance L2.In order to reach better implementation result, this triode VT6 can preferentially adopt 3DG11B transistor npn npn to realize.
As mentioned above, just well the present invention can be realized.
Claims (8)
1. based on the phase shift LED drive system of capacitive feedback bikini oscillating circuit, it is 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, it is characterized in that: between phase-shift circuit and drive circuit, be also serially connected with capacitive feedback bikini oscillating circuit, described capacitive feedback bikini oscillating circuit is by triode VT5, triode VT6, N pole is connected with the collector electrode of triode VT5, the diode D5 that P pole is then connected with phase-shift circuit, one end is connected with the P pole of diode D5, the resistance R9 that the other end is then connected with the base stage of triode VT5, positive pole is connected with the collector electrode of triode VT6 after oscillator X, the polar capacitor C10 of minus earth, one end is connected with the emitter of triode VT5, the resistance R10 that the other end is then connected with the negative pole of polar capacitor C10 after resistance R11, positive pole is connected with the emitter of triode VT5, the polar capacitor C9 that negative pole is then connected with the collector electrode of triode VT6, the controllable impedance L2 be in parallel with polar capacitor C9, N pole is connected with the emitter of triode VT5, the diode D6 that P pole is then connected with the negative pole of polar capacitor C10 after resistance R12, and positive pole is connected with the emitter of triode VT6, the polar capacitor C11 that negative pole is then connected with the negative pole of polar capacitor C10 forms, connect 15V voltage while the emitter of described triode VT5 is connected with drive circuit, its collector electrode is then connected with the tie point of resistance R11 with resistance R10, the base stage of described triode VT6 is then connected with the collector electrode of triode VT5, its emitter is then connected with the P pole of diode D6.
2. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 1, it is characterized in that: 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 electrode of triode VT2 is connected with the emitter of drive circuit and triode VT5 respectively, its emitter is then all connected with the P pole of drive circuit and diode D5, and the negative pole of electric capacity C2 is connected with current rectifying and wave filtering circuit.
3. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 2, is characterized in that: described current rectifying and wave filtering circuit comprises diode bridge rectifier U and electric capacity C1; Between the Same Name of Ends that the input of diode bridge rectifier U is serially connected in transformer T secondary and non-same polarity, between the cathode output end that the positive and negative pole of electric capacity C1 is then serially connected in diode bridge rectifier U and cathode output end, 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; The former limit of described transformer T is then as the input of system.
4. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 3, 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 and the emitter of triode VT5 respectively, its grounded collector, the THRE pin of described driving chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is all connected with open loop protection circuit with RESET pin, the positive pole of described polar capacitor C5 is also connected with the P pole of diode D5.
5. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 4, 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.
6. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 2 ~ 5 any one, is characterized in that: described phase shift chip U1 is LM741 integrated chip.
7. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 5, is characterized in that: described driving chip U2 is NE555 integrated chip.
8. the phase shift LED drive system based on capacitive feedback bikini oscillating circuit according to claim 5, is characterized in that: described protect IC U3 is CN5619 integrated chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
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| CN2014106927162 | 2014-11-26 | ||
| 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 |
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| CN104853509A true CN104853509A (en) | 2015-08-19 |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109802573A (en) * | 2019-01-30 | 2019-05-24 | 西安微电子技术研究所 | A kind of current source PWM controller and Magnetic isolation feedback driving circuit and DC/DC converter based on it |
Families Citing this family (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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| CN201312402Y (en) * | 2008-12-02 | 2009-09-16 | 田冬华 | LED lamp constant current circuit |
| CN102612197A (en) * | 2011-01-20 | 2012-07-25 | 海洋王照明科技股份有限公司 | LED (light emitting diode) driving circuit and LED lamp using same |
| KR20130081522A (en) * | 2012-01-09 | 2013-07-17 | 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 |
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- 2014-11-26 CN CN201410692716.2A patent/CN104411053A/en active Pending
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| CN201312402Y (en) * | 2008-12-02 | 2009-09-16 | 田冬华 | LED lamp constant current circuit |
| CN102612197A (en) * | 2011-01-20 | 2012-07-25 | 海洋王照明科技股份有限公司 | LED (light emitting diode) driving circuit and LED lamp using same |
| KR20130081522A (en) * | 2012-01-09 | 2013-07-17 | 김진국 | Led lamp driving device operating connected to the ballast for fluorcent lamp and the led lamp comprising the driving device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109802573A (en) * | 2019-01-30 | 2019-05-24 | 西安微电子技术研究所 | A kind of current source PWM controller and Magnetic isolation feedback driving circuit and DC/DC converter based on it |
| 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 |
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| CN104411053A (en) | 2015-03-11 |
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Application publication date: 20150819 |