CN104936343A - Voltage-stabilizing oscillation type LED drive system capable of open circuit protection - Google Patents
Voltage-stabilizing oscillation type LED drive system capable of open circuit protection Download PDFInfo
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- CN104936343A CN104936343A CN201510309827.5A CN201510309827A CN104936343A CN 104936343 A CN104936343 A CN 104936343A CN 201510309827 A CN201510309827 A CN 201510309827A CN 104936343 A CN104936343 A CN 104936343A
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a voltage-stabilizing oscillation type LED drive system capable of open circuit protection. The LED drive system is characterized by comprising a transformer T, a rectification and filter circuit, a voltage stabilizing circuit, a drive circuit and an open circuit protection circuit, wherein the rectification and filter circuit is connected with the secondary side of the transformer T, the voltage stabilizing circuit is connected with the output end of the rectification and filter circuit, the drive circuit is connected with the output end of the voltage stabilizing circuit, and the open circuit protection circuit is connected with the drive circuit. The input end of the transformer T is provided with an oscillation type voltage stabilizing circuit. The LED drive system can adjust the oscillation coefficient more effectively, the application range is further widened, the voltage can be stabilized more effectively, signals can be transmitted in the circuits more smoothly, and the transmission smoothness is improved; and due to arrangement of the open circuit protection circuit, electronic components in the circuits are protected when LED lamps are damaged, and loss caused by secondary damage is avoided.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting 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 voltage stabilizing oscillation mode LED drive system with open circuit protecting function is provided.
Object of the present invention is by following technical proposals reality:
A kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting 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 drive circuit be connected with circuit output end of pressure-stabilizing, and the open loop protection circuit be connected with drive circuit forms, the input of transformer T is also provided with oscillation mode voltage stabilizing circuit, described oscillation mode voltage stabilizing circuit is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, although N pole is connected with the collector electrode of Sa Ni VT102, the diode D102 that P pole is connected with the collector electrode of triode VT102 after inductance L 102, negative pole is connected with the P pole of diode D102, the electric capacity C102 that positive pole is connected with the N pole of diode D102 after diode D101, positive pole is connected with the N pole of diode D102, the electric capacity C101 that negative pole is connected with the positive pole of electric capacity C, positive pole is connected with the negative pole of electric capacity C102 after inductance L 101, the electric capacity C103 that negative pole is connected with the collector electrode of triode VT102, negative pole is connected with the base stage of triode VT102, the electric capacity C104 that positive pole is connected with the collector electrode of triode VT101 after resistance R101, the resistance R102 in parallel with electric capacity C104, one end is connected with the base stage of triode VT101, the resistance R103 that the other end is connected with the base stage of triode VT103 after resistance R105, one end ground connection, the resistance R104 that the other end is connected with the emitter of triode VT102, the electric capacity C105 in parallel with resistance R104, be serially connected in the electric capacity C106 between the collector electrode of triode VT103 and base stage, P pole is connected with the base stage of triode VT103 after diode D104, the diode D103 that N pole is connected with the emitter of triode VT103 after resistance R107, N pole is connected with the emitter of triode VT103, the diode D105 that P pole is connected with the N pole of diode D103 after resistance R108, be serially connected in the resistance R109 between the emitter of triode VT104 and base stage, be serially connected in the resistance R110 between the emitter of triode VT105 and base stage, one end is connected with the N pole of diode D105, the resistance R111 that the other end is connected with the base stage of triode VT106 after resistance R112, P pole is connected with the collector electrode of triode VT103, the voltage stabilizing didoe D107 that N pole is connected with the base stage of triode VT106 after electric capacity C108, the electric capacity C107 in parallel with voltage stabilizing didoe D107, N pole is connected with the P pole of voltage stabilizing didoe D107, the diode D106 that P pole is connected with the N pole of voltage stabilizing didoe D107 after resistance R106, and one end is connected with the base stage of triode VT107, the resistance R113 that the other end is connected with the N pole of voltage stabilizing didoe D107 forms, wherein, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT101 is connected with the positive pole of electric capacity C103, the negative pole of electric capacity C101 is connected with the N pole of diode D103, the emitter of triode VT104 is connected with the P pole of diode D105, its collector electrode is connected with the collector electrode of triode VT105 and the emitter of triode VT106, its base stage is connected with the emitter of triode VT105, the N pole of voltage stabilizing didoe D107 is connected with the tie point of resistance R105 with resistance R103, its P pole is connected with the tie point of resistance R112 with resistance R111, the emitter of triode VT107 is connected with the emitter of triode VT106, the P pole of diode D101 and the tie point of resistance R103 and resistance R105 form input, the collector electrode of triode VT104 and the negative pole of electric capacity C108 form output.
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 voltage stabilizing circuit, 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 electric capacity 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 electric capacity 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 all connected with drive circuit with ISET pin, and its DRV pin is then connected with the grid of field effect transistor Q, and 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.
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, the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit, and the Same Name of Ends on the former limit of transformer T is connected with the collector electrode of triode VT104, non-same polarity is connected with the negative pole of electric capacity C108.
Described voltage stabilizing circuit is by voltage stabilizing chip U1, electric capacity C2, resistance R1, and potentiometer R2 forms.The OUT pin of voltage stabilizing chip U1 is connected with drive circuit with the negative pole of electric capacity C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of electric capacity C1, GND pin ground connection; The negative pole of described electric capacity C1 is also connected with the sliding end of potentiometer R2.
Described drive circuit is by driving 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 driving chip U2, the resistance R4 that one end is connected with the DIS pin of driving chip U2, the other end is connected with the emitter of triode VT1, one end is connected with the TRI pin of driving chip U2, the electric capacity C3 of other end ground connection, and one end is connected with the CONT pin of driving chip U2, the electric capacity C4 of other end ground connection forms; The base stage of described triode VT1 is also connected with the negative pole of electric capacity C1, its grounded collector; The THRE pin of driving chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the ISET pin of protect IC U3, and RESET pin is connected with the VDD pin of protect IC U3.
The present invention compared with prior art has the following advantages and beneficial effect:
1, 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.
2, 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.
3, structure of the present invention is simple, and cost of manufacture is cheap.
4, the present invention is provided with oscillation mode voltage stabilizing circuit and can better adjusts vibration coefficient, expands its scope of application further, can also cross better burning voltage simultaneously, signal can be transmitted more stably in circuit, improve the stationarity of Signal transmissions.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the circuit diagram of oscillation mode voltage stabilizing circuit of the present invention.
Description of reference numerals:
10, oscillation mode voltage stabilizing circuit.
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, 2, the present invention 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 drive circuit be connected with circuit output end of pressure-stabilizing, and the open loop protection circuit be connected with drive circuit forms; The input of transformer T is also provided with oscillation mode voltage stabilizing circuit 10.
Oscillation mode voltage stabilizing circuit 10 is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, resistance R101, resistance R102, resistance R103, resistance R104, resistance R105, resistance R106, resistance R107, resistance R108, resistance R109, resistance R110, resistance R111, resistance R112, resistance R113, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, electric capacity C105, electric capacity C106, electric capacity C107, electric capacity C108, inductance L 101, inductance L 102, diode D101, diode D102, diode D103, diode D104, diode D105, diode D106, voltage stabilizing didoe D107 forms.During connection, although the N pole of diode D102 is connected with the collector electrode of Sa Ni VT102, P pole is connected with the collector electrode of triode VT102 after inductance L 102, the negative pole of electric capacity C102 is connected with the P pole of diode D102, positive pole is connected with the N pole of diode D102 after diode D101, the positive pole of electric capacity C101 is connected with the N pole of diode D102, negative pole is connected with the positive pole of electric capacity C, the positive pole of electric capacity C103 is connected with the negative pole of electric capacity C102 after inductance L 101, negative pole is connected with the collector electrode of triode VT102, the negative pole of electric capacity C104 is connected with the base stage of triode VT102, positive pole is connected with the collector electrode of triode VT101 after resistance R101, resistance R102 is in parallel with electric capacity C104, one end of resistance R103 is connected with the base stage of triode VT101, the other end is connected with the base stage of triode VT103 after resistance R105, one end ground connection of resistance R104, the other end is connected with the emitter of triode VT102, electric capacity C105 is in parallel with resistance R104, between the collector electrode that electric capacity C106 is serially connected in triode VT103 and base stage, the P pole of diode D103 is connected with the base stage of triode VT103 after diode D104, N pole is connected with the emitter of triode VT103 after resistance R107, the N pole of diode D105 is connected with the emitter of triode VT103, P pole is connected with the N pole of diode D103 after resistance R108, between the emitter that resistance R109 is serially connected in triode VT104 and base stage, between the emitter that resistance R110 is serially connected in triode VT105 and base stage, one end of resistance R111 is connected with the N pole of diode D105, the other end is connected with the base stage of triode VT106 after resistance R112, the P pole of voltage stabilizing didoe D107 is connected with the collector electrode of triode VT103, N pole is connected with the base stage of triode VT106 after electric capacity C108, electric capacity C107 is in parallel with voltage stabilizing didoe D107, the N pole of diode D106 is connected with the P pole of voltage stabilizing didoe D107, P pole is connected with the N pole of voltage stabilizing didoe D107 after resistance R106, one end of resistance R113 is connected with the base stage of triode VT107, the other end is connected with the N pole of voltage stabilizing didoe D107, wherein, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT101 is connected with the positive pole of electric capacity C103, the negative pole of electric capacity C101 is connected with the N pole of diode D103, the emitter of triode VT104 is connected with the P pole of diode D105, its collector electrode is connected with the collector electrode of triode VT105 and the emitter of triode VT106, its base stage is connected with the emitter of triode VT105, the N pole of voltage stabilizing didoe D107 is connected with the tie point of resistance R105 with resistance R103, its P pole is connected with the tie point of resistance R112 with resistance R111, the emitter of triode VT107 is connected with the emitter of triode VT106, the P pole of diode D101 and the tie point of resistance R103 and resistance R105 form input, the collector electrode of triode VT104 and the negative pole of electric capacity C108 form output.
Open loop protection circuit is emphasis of 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 damaging and bring larger loss.It is by the protect IC U3 playing process effect, field effect transistor Q, triode VT2, Zener diode D1, Zener diode D2, inductance L 1, and resistance R5, resistance R6, electric capacity C5, electric capacity C6 form.During connection, the N pole of Zener diode D1 is connected with the VDD pin of protect IC U3, P pole is then connected with voltage stabilizing circuit, one end of inductance L 1 is connected with the N pole of Zener diode D1, the other end is then connected with the drain electrode of field effect transistor Q, one end of resistance R5 is connected with the source electrode of field effect transistor Q, other end ground connection, one end of electric capacity C5 is connected with the drain electrode of field effect transistor Q, the other end is then connected with the collector electrode of triode VT2, and one end of electric capacity C6 is connected with the drain electrode of field effect transistor Q, other end ground connection, one end of resistance R6 is connected with the emitter of triode VT2, the other end is connected with the CS pin of protect IC U3, the N pole of Zener diode D2 is connected with the drain electrode of field effect transistor Q, P pole connects.Meanwhile, the VDD pin of protect IC U3 is all connected with drive circuit with ISET pin, and its DRV pin is then connected with the grid of field effect transistor Q, and 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.In order to improve protected effect and make the antijamming capability of drive system better, protect IC U3 is preferably CN5619.
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, the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit, and the Same Name of Ends on the former limit of transformer T is connected with the collector electrode of triode VT104, non-same polarity is connected with the negative pole of electric capacity C108.
In order to make the voltage of drive system more stable, in order to avoid LED is operationally affected, in system, be provided with voltage stabilizing circuit.It is by voltage stabilizing chip U1, electric capacity C2, resistance R1, and potentiometer R2 forms.During connection, the OUT pin of voltage stabilizing chip U1 is connected with drive circuit with the negative pole of electric capacity C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of electric capacity C1, GND pin ground connection, meanwhile, the negative pole of electric capacity C1 is also connected with the sliding end of potentiometer R2.
Drive circuit in system is by driving chip U2, and triode VT1, resistance R3, resistance R4, electric capacity C3, electric capacity C4, form.Wherein, one end of resistance R3 is connected with the base stage of triode VT1, the other end is then connected with the VCC pin of driving chip U2, one end of resistance R4 is connected with the DIS pin of driving chip U2, the other end is connected with the emitter of triode VT1, one end of electric capacity C3 is connected with the TRI pin of driving chip U2, other end ground connection, and one end of electric capacity C4 is connected with the CONT pin of driving chip U2, other end ground connection.Meanwhile, the base stage of triode VT1 is also connected with the negative pole of electric capacity C1, its grounded collector.The THRE pin of driving chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the ISET pin of protect IC U3, and RESET pin is connected with the VDD pin of protect IC U3.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. one kind has the voltage stabilizing oscillation mode LED drive system of open circuit protecting function, it is characterized in that: 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 drive circuit be connected with circuit output end of pressure-stabilizing, and the open loop protection circuit be connected with drive circuit forms, the input of transformer T is also provided with oscillation mode voltage stabilizing circuit (10), described oscillation mode voltage stabilizing circuit (10) is by triode VT101, triode VT102, triode VT103, triode VT104, triode VT105, triode VT106, triode VT107, although N pole is connected with the collector electrode of Sa Ni VT102, the diode D102 that P pole is connected with the collector electrode of triode VT102 after inductance L 102, negative pole is connected with the P pole of diode D102, the electric capacity C102 that positive pole is connected with the N pole of diode D102 after diode D101, positive pole is connected with the N pole of diode D102, the electric capacity C101 that negative pole is connected with the positive pole of electric capacity C, positive pole is connected with the negative pole of electric capacity C102 after inductance L 101, the electric capacity C103 that negative pole is connected with the collector electrode of triode VT102, negative pole is connected with the base stage of triode VT102, the electric capacity C104 that positive pole is connected with the collector electrode of triode VT101 after resistance R101, the resistance R102 in parallel with electric capacity C104, one end is connected with the base stage of triode VT101, the resistance R103 that the other end is connected with the base stage of triode VT103 after resistance R105, one end ground connection, the resistance R104 that the other end is connected with the emitter of triode VT102, the electric capacity C105 in parallel with resistance R104, be serially connected in the electric capacity C106 between the collector electrode of triode VT103 and base stage, P pole is connected with the base stage of triode VT103 after diode D104, the diode D103 that N pole is connected with the emitter of triode VT103 after resistance R107, N pole is connected with the emitter of triode VT103, the diode D105 that P pole is connected with the N pole of diode D103 after resistance R108, be serially connected in the resistance R109 between the emitter of triode VT104 and base stage, be serially connected in the resistance R110 between the emitter of triode VT105 and base stage, one end is connected with the N pole of diode D105, the resistance R111 that the other end is connected with the base stage of triode VT106 after resistance R112, P pole is connected with the collector electrode of triode VT103, the voltage stabilizing didoe D107 that N pole is connected with the base stage of triode VT106 after electric capacity C108, the electric capacity C107 in parallel with voltage stabilizing didoe D107, N pole is connected with the P pole of voltage stabilizing didoe D107, the diode D106 that P pole is connected with the N pole of voltage stabilizing didoe D107 after resistance R106, and one end is connected with the base stage of triode VT107, the resistance R113 that the other end is connected with the N pole of voltage stabilizing didoe D107 forms, wherein, the collector electrode of triode VT102 is connected with the base stage of triode VT103, the emitter of triode VT101 is connected with the positive pole of electric capacity C103, the negative pole of electric capacity C101 is connected with the N pole of diode D103, the emitter of triode VT104 is connected with the P pole of diode D105, its collector electrode is connected with the collector electrode of triode VT105 and the emitter of triode VT106, its base stage is connected with the emitter of triode VT105, the N pole of voltage stabilizing didoe D107 is connected with the tie point of resistance R105 with resistance R103, its P pole is connected with the tie point of resistance R112 with resistance R111, the emitter of triode VT107 is connected with the emitter of triode VT106, the P pole of diode D101 and the tie point of resistance R103 and resistance R105 form input, the collector electrode of triode VT104 and the negative pole of electric capacity C108 form output.
2. a kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting function according to claim 1, 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 voltage stabilizing circuit, 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 electric capacity 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 electric capacity 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 all connected with drive circuit with ISET pin, and its DRV pin is then connected with the grid of field effect transistor Q, and 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.
3. a kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting function according to claim 2, 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, the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit, and the Same Name of Ends on the former limit of transformer T is connected with the collector electrode of triode VT104, non-same polarity is connected with the negative pole of electric capacity C108.
4. a kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting function according to claim 3, is characterized in that: described voltage stabilizing circuit is by voltage stabilizing chip U1, electric capacity C2, resistance R1, and potentiometer R2 forms; The OUT pin of voltage stabilizing chip U1 is connected with drive circuit with the negative pole of electric capacity C1 after resistance R1 and potentiometer R2 simultaneously, and its IN pin is then connected with the positive pole of electric capacity C1, GND pin ground connection; The negative pole of described electric capacity C1 is also connected with the sliding end of potentiometer R2.
5. a kind of voltage stabilizing oscillation mode LED drive system with open circuit protecting function according to claim 4, it is characterized in that: described drive circuit is by driving 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 driving chip U2, one end is connected with the DIS pin of driving 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 driving chip U2, the electric capacity C3 of other end ground connection, and one end is connected with the CONT pin of driving chip U2, the electric capacity C4 of other end ground connection forms, the base stage of described triode VT1 is also connected with the negative pole of electric capacity C1, its grounded collector, the THRE pin of driving chip U2 is connected with its DIS pin, GND pin ground connection, and OUT pin is connected with the ISET pin of protect IC U3, and RESET pin is connected with the VDD pin of protect IC U3.
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CN201510309827.5A CN104936343A (en) | 2014-11-18 | 2015-06-08 | Voltage-stabilizing oscillation type LED drive system capable of open circuit protection |
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CN201410660842.XA CN104394619A (en) | 2014-11-18 | 2014-11-18 | LED driving system with open circuit protection function |
CN201510309827.5A CN104936343A (en) | 2014-11-18 | 2015-06-08 | Voltage-stabilizing oscillation type LED drive system capable of open circuit protection |
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Application publication date: 20150923 |