CN104981056A - LED drive system with function of non-isolated output step-down protection - Google Patents
LED drive system with function of non-isolated output step-down protection Download PDFInfo
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Abstract
The present invention discloses an LED drive system with the a function of non-isolated output step-down protection. The LED drive system comprises is composed of a transformer T, a rectifyingier-filtering circuit, a voltage stabilizing circuit, a voltage measuring detection circuit, a linear driving circuit and an open circuit protection circuit, wherein the rectifying-filtering rectifier-filter circuit is connected with the secondary side of the transformer T, the voltage stabilizing circuit is connected with the output end of the rectifying-filtering rectifier-filter circuit, both the measuring voltages voltage detection circuit and the linear driving circuit are both connected with the output end of the voltage stabilizing circuit, and the open circuit protection circuit is connected with the voltage detection measuring circuit. The system is characterized in that a non-isolated output step-down circuit is further arranged between the voltage detection circuit and the open circuit protection circuit; the non-isolated output step-down circuit is composed of a step-down chip U5, a triode VT7, a triode VT8, a diode D5 and the like, wherein the pole P is sequentially connected with the VCC fin of the step-down chip U5 through a resistor R16 and a resistor R20 and the pole N is connected with the voltage detection circuit. According to the LED drive system disclosed by the present invention, as the non-isolated output step-down circuit is arranged, the protection function of the LED drive system can be more stable.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of LED drive system with non-isolated output buck defencive function.
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, the overvoltage that LED also can cause because of thunderbolt, static discharge (ESD), overheated or even reverse power connection and cause damage.But the moment that LED damages in circuit other electronic component be easy to be damaged, thus bring unnecessary loss.
Summary of the invention
The object of the invention is to solve current LED drive system other electronic component in LED is damaged moment circuit and be also easy to the defect be damaged, a kind of LED drive system with non-isolated output buck defencive function is provided.
Object of the present invention is by following technical proposals reality: a kind of LED drive system with non-isolated output buck defencive function; by transformer T; the current rectifying and wave filtering circuit be connected with transformer T secondary; the voltage stabilizing circuit be connected with rectification filter circuit output end; the voltage detecting circuit be all connected with circuit output end of pressure-stabilizing and linear drive circuit; the open loop protection circuit be connected with voltage detecting circuit, and be serially connected in the non-isolated output buck circuit composition between voltage detecting circuit and open loop protection circuit.Described non-isolated output buck circuit is by step-down chip U5, triode VT7, and triode VT8, P pole is in turn through resistance R16, be connected with the VCC pin of step-down chip U5 after resistance R20, the diode D5 that N pole is connected with at voltage detecting circuit, positive pole is connected with the N pole of diode D5 after resistance R14, negative pole is in turn through resistance R15, resistance R18, polar capacitor C13, the polar capacitor C10 be connected with the CS pin of step-down chip U5 after resistance R17, P pole is in turn through polar capacitor C11, be connected with the tie point of resistance R20 with resistance R16 after resistance R19, the diode D6 that N pole is connected with the collector electrode of triode VT7 through polar capacitor C12, P pole is connected with the emitter of triode VT8, the voltage stabilizing didoe D9 that N pole is connected with open loop protection circuit, N pole is in turn through resistance R22, be connected with the tie point of polar capacitor C11 with resistance R19 after resistance R21, P pole is in turn through the collector electrode of triode VT7 and the tie point of polar capacitor C12, the diode D7 be connected with the N pole of voltage stabilizing didoe D9 after resistance R26, positive pole is connected with the FB pin of step-down chip U5 after resistance R25, the polar capacitor C14 that negative pole is connected with the base stage of triode VT8, P pole is connected with the emitter of triode VT7, the diode D8 of ground connection after N pole is connected with the GND pin of step-down chip U5 after resistance R23, and one end is connected with the OUT pin of step-down chip U5, the adjustable resistance R24 that the other end is connected with the base stage of triode VT8 forms, grounded collector, the base stage of described triode VT8 are also connected with the tie point of resistance R18 with resistance R15.
Described linear drive circuit is by driving chip U4, triode VT3, triode VT4, triode VT5, triode VT6, positive pole is connected with voltage stabilizing circuit, the polar capacitor C7 that negative pole is connected with the IN1 pin of driving chip U4 after resistance R7, one end is connected with the collector electrode of triode VT6, the resistance R8 that the other end is connected with the base stage of triode VT3 after resistance R9, positive pole is connected with the base stage of triode VT6, the polar capacitor C9 that negative pole is connected with the IN1 pin of driving chip U4, positive pole is connected with the IN2 pin of driving chip U4, the polar capacitor C8 of minus earth, one end is connected with the emitter of triode VT6, the resistance R11 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT6, the diode D3 that P pole is connected with the collector electrode of triode VT5, positive terminal is connected with the collector electrode of triode VT6, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R13 that the other end is connected with the emitter of triode VT3 after resistance R12, and the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R12 with resistance R13 forms, the VCC pin of described driving chip U4 is connected with the base stage of triode VT6, END pin ground connection, OUT pin are connected with the collector electrode of triode VT5, the collector electrode of triode VT5 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3, the grounded collector of triode VT3, the N pole of diode D4 is connected with open loop protection circuit.
Described current rectifying and wave filtering circuit comprises diode bridge rectifier U and polar capacitor 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 polar capacitor C1 is then serially connected between two outputs of diode bridge rectifier U, and the positive and negative electrode of described polar capacitor C1 is also connected with voltage stabilizing circuit.
Described voltage stabilizing circuit is by voltage stabilizing chip U1, polar capacitor C2, resistance R1, and potentiometer R2 forms; The OUT pin of voltage stabilizing chip U1 is connected with voltage detecting circuit with the negative pole of polar capacitor C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of polar capacitor C1, GND pin ground connection; The negative pole of described polar capacitor C1 is also connected with the sliding end of potentiometer R2, and the OUT pin of voltage stabilizing chip U1 is also connected with the positive pole of polar capacitor C7; Described voltage stabilizing chip U1 is CMD6N07 integrated chip.
Described voltage detecting circuit is by detection chip U2, triode VT1, the resistance R3 that one end is connected with the base stage of triode VT1, the other end is then connected with the VCC pin of detection chip U2, the resistance R4 that one end is connected with the DIS pin of detection chip U2, the other end is connected with the emitter of triode VT1, one end is connected with the TRI pin of detection chip U2, the polar capacitor C3 of other end ground connection, and one end is connected with the CONT pin of detection chip U2, the polar capacitor C4 of other end ground connection forms; The base stage of described triode VT1 is also connected with the negative pole of polar capacitor C1, its grounded collector; The THRE pin of detection chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the N pole of diode D5, and RESET pin is connected with open loop protection circuit; Described detection chip U2 is NE 555 integrated chip.
Described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT2, N pole is connected with the VDD pin of protect IC U3, the Zener diode D1 that P pole is then connected with the N pole of diode D4, one end is connected with the N pole of Zener diode D1, 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 R5 of other end ground connection, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C5 that the other end is then connected with the collector electrode of triode VT2, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C6 of other end ground connection, one end is connected with the emitter of triode VT2, the resistance R6 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 D2 of P pole ground connection forms, the VDD pin of described protect IC U3 is connected with the RESET pin of detection chip U2, its ISET pin is connected with the N pole of voltage stabilizing didoe D9, its DRV pin is then connected with the grid of field effect transistor Q, ILIM pin is connected with the base stage of triode VT2 with the source electrode of field effect transistor Q simultaneously, GND pin ground connection, LED group is then serially connected between the CS pin of protect IC U3 and the N pole of Zener diode D2, described protect IC U3 is ACT364 integrated chip.
For guaranteeing result of use, described step-down chip U5 is AP3766 integrated chip, and driving chip U4 is LM387 integrated chip.
The present invention compared with prior art has the following advantages and beneficial effect:
1, the present invention is provided with non-isolated output buck circuit, and reduce system power dissipation, improve efficiency, this circuit has efficient output performance, effectively improves the stability of LED drive system.
2, the present invention is provided with open loop protection circuit, 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.
3, be provided with protect IC in open loop protection circuit of the present invention, the antijamming capability of LED drive system can be improved, LED is worked more stable.
4, the present invention is provided with linear drive circuit, and it can make the defencive function of drive system more stable.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of linear drive circuit of the present invention.
Fig. 3 is the structural representation of non-isolated output buck circuit 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 is by transformer T; the current rectifying and wave filtering circuit be connected with transformer T secondary; the voltage stabilizing circuit be connected with rectification filter circuit output end; the voltage detecting circuit be all connected with circuit output end of pressure-stabilizing and linear drive circuit; the open loop protection circuit be connected with voltage detecting circuit, and be serially connected in the non-isolated output buck circuit composition between voltage detecting circuit and open loop protection circuit.
Described non-isolated output buck circuit as shown in Figure 3, by step-down chip U5, triode VT7, triode VT8, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, polar capacitor C10, polar capacitor C11, polar capacitor C12, polar capacitor C13, polar capacitor C14, diode D5, diode D6, diode D7, diode D8, and diode D9 forms.
During connection, the P pole of diode D5 is connected with the VCC pin of step-down chip U5 in turn after resistance R16, resistance R20, N pole is connected with at voltage detecting circuit.The positive pole of polar capacitor C10 is connected with the N pole of diode D5 after resistance R14, negative pole is connected with the CS pin of step-down chip U5 in turn after resistance R15, resistance R18, polar capacitor C13, resistance R17.
Wherein, the P pole of diode D6 is connected with the tie point of resistance R20 with resistance R16 in turn after polar capacitor C11, resistance R19, N pole is connected with the collector electrode of triode VT7 through polar capacitor C12.The P pole of voltage stabilizing didoe D9 is connected with the emitter of triode VT8, N pole is connected with open loop protection circuit.The N pole of diode D7 is connected with the tie point of polar capacitor C11 with resistance R19 in turn after resistance R22, resistance R21, P pole is connected with the N pole of voltage stabilizing didoe D9 in turn after the tie point of the collector electrode of triode VT7 and polar capacitor C12, resistance R26.
The positive pole of polar capacitor C14 is connected with the FB pin of step-down chip U5 after resistance R25, negative pole is connected with the base stage of triode VT8.Ground connection after the P pole of diode D8 is connected with the emitter of triode VT7, N pole is connected with the GND pin of step-down chip U5 after resistance R23.And one end of adjustable resistance R24 is connected with the OUT pin of step-down chip U5, the other end is connected with the base stage of triode VT8.
Grounded collector, the base stage of described triode VT8 are also connected with the tie point of resistance R18 with resistance R15.
For better implementing the present invention, described step-down chip U5 employs AP3766 integrated chip, this chip input ac voltage wide ranges, the effective control voltage regulation of energy and load regulation within the scope of AC60 ~ 300V; It also has frequency jitter and dynamic self-powered, short circuit autoboot, current limliting, overheated, restriction Duty function, just effectively raise driveability of the present invention.
As shown in Figure 2, described linear drive circuit is by driving chip U4, triode VT3, triode VT4, triode VT5, triode VT6, positive pole is connected with voltage stabilizing circuit, the polar capacitor C7 that negative pole is connected with the IN1 pin of driving chip U4 after resistance R7, one end is connected with the collector electrode of triode VT6, the resistance R8 that the other end is connected with the base stage of triode VT3 after resistance R9, positive pole is connected with the base stage of triode VT6, the polar capacitor C9 that negative pole is connected with the IN1 pin of driving chip U4, positive pole is connected with the IN2 pin of driving chip U4, the polar capacitor C8 of minus earth, one end is connected with the emitter of triode VT6, the resistance R11 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT6, the diode D3 that P pole is connected with the collector electrode of triode VT5, positive terminal is connected with the collector electrode of triode VT6, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R13 that the other end is connected with the emitter of triode VT3 after resistance R12, and the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R12 with resistance R13 forms.
The VCC pin of described driving chip U4 is connected with the base stage of triode VT6, END pin ground connection, OUT pin are connected with the collector electrode of triode VT5; the collector electrode of triode VT5 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3; the grounded collector of triode VT3, the N pole of diode D4 is connected with open loop protection circuit.
Linear drive circuit of the present invention, can make the defencive function of drive system more stable.
In order to ensure implementation result, described driving chip U4 is LM387 integrated chip, its highly sensitive and low price.
Described current rectifying and wave filtering circuit comprises diode bridge rectifier U and polar capacitor C1.
During enforcement, two inputs of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T secondary respectively, and the positive and negative electrode of polar capacitor C1 is then serially connected between two outputs of diode bridge rectifier U.
The positive and negative electrode of described polar capacitor C1 is also connected with voltage stabilizing circuit.
Described voltage stabilizing circuit is by voltage stabilizing chip U1, polar capacitor C2, resistance R1, and potentiometer R2 forms.
During connection, the OUT pin of voltage stabilizing chip U1 is connected with voltage detecting circuit with the negative pole of polar capacitor C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of polar capacitor C1, GND pin ground connection.
The negative pole of described polar capacitor C1 is also connected with the sliding end of potentiometer R2, and the OUT pin of voltage stabilizing chip U1 is also connected with the positive pole of polar capacitor C7.
For better implementing the present invention, described voltage stabilizing chip U1 is CMD6N07 integrated chip.
Described voltage detecting circuit is by detection chip U2, triode VT1, the resistance R3 that one end is connected with the base stage of triode VT1, the other end is then connected with the VCC pin of detection chip U2, the resistance R4 that one end is connected with the DIS pin of detection chip U2, the other end is connected with the emitter of triode VT1, one end is connected with the TRI pin of detection chip U2, the polar capacitor C3 of other end ground connection, and one end is connected with the CONT pin of detection chip U2, the polar capacitor C4 of other end ground connection forms.
The base stage of described triode VT1 is also connected with the negative pole of polar capacitor C1, its grounded collector; The THRE pin of detection chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the N pole of diode D5, and RESET pin is connected with open loop protection circuit.
During the invention process, described detection chip U2 is NE 555 integrated chip.
Described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT2, N pole is connected with the VDD pin of protect IC U3, the Zener diode D1 that P pole is then connected with the N pole of diode D4, one end is connected with the N pole of Zener diode D1, 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 R5 of other end ground connection, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C5 that the other end is then connected with the collector electrode of triode VT2, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C6 of other end ground connection, one end is connected with the emitter of triode VT2, the resistance R6 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 D2 of P pole ground connection forms.
The VDD pin of described protect IC U3 is connected with the RESET pin of detection chip U2, its ISET pin is connected with the N pole of voltage stabilizing didoe D9, its DRV pin is then connected with the grid of field effect transistor Q; ILIM pin is connected with the base stage of triode VT2 with the source electrode of field effect transistor Q simultaneously; GND pin ground connection, LED group is then serially connected between the CS pin of protect IC U3 and the N pole of Zener diode D2.
For guaranteeing smooth enforcement of the present invention, described protect IC U3 is ACT364 integrated chip.
As mentioned above, just well the present invention can be realized.
Claims (6)
1. one kind has the LED drive system of non-isolated output buck defencive function, by transformer T, the current rectifying and wave filtering circuit be connected with transformer T secondary, the voltage stabilizing circuit be connected with rectification filter circuit output end, the voltage detecting circuit be all connected with circuit output end of pressure-stabilizing and linear drive circuit, and the open loop protection circuit be connected with voltage detecting circuit forms, it is characterized in that: between voltage detecting circuit and open loop protection circuit, be also provided with non-isolated output buck circuit, described non-isolated output buck circuit is by step-down chip U5, triode VT7, and triode VT8, P pole is in turn through resistance R16, be connected with the VCC pin of step-down chip U5 after resistance R20, the diode D5 that N pole is connected with voltage detecting circuit, positive pole is connected with the N pole of diode D5 after resistance R14, negative pole is in turn through resistance R15, resistance R18, polar capacitor C13, the polar capacitor C10 be connected with the CS pin of step-down chip U5 after resistance R17, P pole is in turn through polar capacitor C11, be connected with the tie point of resistance R20 with resistance R16 after resistance R19, the diode D6 that N pole is connected with the collector electrode of triode VT7 through polar capacitor C12, P pole is connected with the emitter of triode VT8, the voltage stabilizing didoe D9 that N pole is connected with open loop protection circuit, N pole is in turn through resistance R22, be connected with the tie point of polar capacitor C11 with resistance R19 after resistance R21, P pole is in turn through the collector electrode of triode VT7 and the tie point of polar capacitor C12, the diode D7 be connected with the N pole of voltage stabilizing didoe D9 after resistance R26, positive pole is connected with the FB pin of step-down chip U5 after resistance R25, the polar capacitor C14 that negative pole is connected with the base stage of triode VT8, P pole is connected with the emitter of triode VT7, the diode D8 of ground connection after N pole is connected with the GND pin of step-down chip U5 after resistance R23, and one end is connected with the OUT pin of step-down chip U5, the adjustable resistance R24 that the other end is connected with the base stage of triode VT8 forms, grounded collector, the base stage of described triode VT8 are also connected with the tie point of resistance R18 with resistance R15,
Described linear drive circuit is by driving chip U4, triode VT3, triode VT4, triode VT5, triode VT6, positive pole is connected with voltage stabilizing circuit, the polar capacitor C7 that negative pole is connected with the IN1 pin of driving chip U4 after resistance R7, one end is connected with the collector electrode of triode VT6, the resistance R8 that the other end is connected with the base stage of triode VT3 after resistance R9, positive pole is connected with the base stage of triode VT6, the polar capacitor C9 that negative pole is connected with the IN1 pin of driving chip U4, positive pole is connected with the IN2 pin of driving chip U4, the polar capacitor C8 of minus earth, one end is connected with the emitter of triode VT6, the resistance R11 that the other end is connected with the base stage of triode VT5, one end is connected with the base stage of triode VT5, the resistance R10 that the other end is connected with the base stage of triode VT3, N pole is connected with the collector electrode of triode VT6, the diode D3 that P pole is connected with the collector electrode of triode VT5, positive terminal is connected with the collector electrode of triode VT6, the not gate K that end of oppisite phase is connected with triode VT4 collector electrode, one end is connected with triode VT4 emitter, the resistance R13 that the other end is connected with the emitter of triode VT3 after resistance R12, and the end of oppisite phase of P pole NAND gate K is connected, the diode D4 that N pole is connected with the tie point of resistance R12 with resistance R13 forms, the VCC pin of described driving chip U4 is connected with the base stage of triode VT6, END pin ground connection, OUT pin are connected with the collector electrode of triode VT5, the collector electrode of triode VT5 is also connected with the base stage of triode VT4, its emitter is connected with the base stage of triode man VT3, the grounded collector of triode VT3, the N pole of diode D4 is connected with open loop protection circuit.
2. a kind of LED drive system with non-isolated output buck defencive function according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises diode bridge rectifier U and polar capacitor 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 polar capacitor C1 is then serially connected between two outputs of diode bridge rectifier U, and the positive and negative electrode of described polar capacitor C1 is also connected with voltage stabilizing circuit.
3. a kind of LED drive system with non-isolated output buck defencive function according to claim 2, is characterized in that: described voltage stabilizing circuit is by voltage stabilizing chip U1, polar capacitor C2, resistance R1, and potentiometer R2 forms; The OUT pin of voltage stabilizing chip U1 is connected with voltage detecting circuit with the negative pole of polar capacitor C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of polar capacitor C1, GND pin ground connection; The negative pole of described polar capacitor C1 is also connected with the sliding end of potentiometer R2, and the OUT pin of voltage stabilizing chip U1 is also connected with the positive pole of polar capacitor C7; Described voltage stabilizing chip U1 is CMD6N07 integrated chip.
4. a kind of LED drive system with non-isolated output buck defencive function according to claim 3, it is characterized in that: described voltage detecting circuit is by detection chip U2, triode VT1, one end is connected with the base stage of triode VT1, the resistance R3 that the other end is then connected with the VCC pin of detection chip U2, one end is connected with the DIS pin of detection chip U2, the resistance R4 that the other end is connected with the emitter of triode VT1, one end is connected with the TRI pin of detection chip U2, the polar capacitor C3 of other end ground connection, and one end is connected with the CONT pin of detection chip U2, the polar capacitor C4 of other end ground connection forms, the base stage of described triode VT1 is also connected with the negative pole of polar capacitor C1, its grounded collector, the THRE pin of detection chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the N pole of diode D5, and RESET pin is connected with open loop protection circuit, described detection chip U2 is NE 555 integrated chip.
5. a kind of LED drive system with non-isolated output buck defencive function according to claim 4, it is characterized in that: described open loop protection circuit is by protect IC U3, field effect transistor Q, triode VT2, N pole is connected with the VDD pin of protect IC U3, the Zener diode D1 that P pole is then connected with the N pole of diode D4, one end is connected with the N pole of Zener diode D1, 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 R5 of other end ground connection, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C5 that the other end is then connected with the collector electrode of triode VT2, one end is connected with the drain electrode of field effect transistor Q, the polar capacitor C6 of other end ground connection, one end is connected with the emitter of triode VT2, the resistance R6 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 D2 of P pole ground connection forms, the VDD pin of described protect IC U3 is connected with the RESET pin of detection chip U2, its ISET pin is connected with the N pole of voltage stabilizing didoe D9, its DRV pin is then connected with the grid of field effect transistor Q, ILIM pin is connected with the base stage of triode VT2 with the source electrode of field effect transistor Q simultaneously, GND pin ground connection, LED group is then serially connected between the CS pin of protect IC U3 and the N pole of Zener diode D2, described protect IC U3 is ACT364 integrated chip.
6. a kind of LED drive system with non-isolated output buck defencive function according to any one of Claims 1 to 4, is characterized in that: described step-down chip U5 is AP3766 integrated chip; Described driving chip U4 is LM387 integrated chip.
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| CN201510325364.1A CN104981056A (en) | 2014-11-29 | 2015-06-14 | LED drive system with function of non-isolated output step-down protection |
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| CN201410715119.7A CN104470125A (en) | 2014-11-29 | 2014-11-29 | LED drive system with stable open circuit protection function |
| CN2014107151197 | 2014-11-29 | ||
| CN201510325364.1A CN104981056A (en) | 2014-11-29 | 2015-06-14 | LED drive system with function of non-isolated output step-down protection |
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2014
- 2014-11-29 CN CN201410715119.7A patent/CN104470125A/en active Pending
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612578A (en) * | 2015-10-21 | 2017-05-03 | 香港商酷异有限公司 | Driving circuit capable of preventing electromagnetic interference |
| CN105554986A (en) * | 2016-01-28 | 2016-05-04 | 广州航海学院 | Lighting device based on dissipated electromagnetic energy of ship welding machine |
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Application publication date: 20151014 |