CN104394619A - LED driving system with open circuit protection function - Google Patents
LED driving system with open circuit protection function Download PDFInfo
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- CN104394619A CN104394619A CN201410660842.XA CN201410660842A CN104394619A CN 104394619 A CN104394619 A CN 104394619A CN 201410660842 A CN201410660842 A CN 201410660842A CN 104394619 A CN104394619 A CN 104394619A
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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
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Abstract
The invention discloses an LED driving system with an open circuit protection function. The LED driving system is composed of a transformer T for adjusting the mains voltage, a rectifier-filter circuit connected with the secondary side of the transformer T, a voltage stabilizing circuit connected with the output end of the rectifier-filter circuit, a drive circuit connected with the output end of the voltage stabilizing circuit, and an open circuit protection circuit connected with the output end of the drive circuit. The open circuit protection circuit is composed of a protection chip U3 functioning in processing, a field effect tube Q, a triode VT2, a Zener diode D1, a Zener diode D2, an inductor L1, a resistor R5, a resistor R6, a capacitor C5 and a capacitor C6. The LED driving system with the open circuit protection function is provided with the open circuit protection circuit, and other electronic elements in the circuit can be protected at the moment when an LED lamp is damaged by use of the open circuit protection circuit, and therefore, secondary damage is prevented and the resulting greater loss of people can be avoided.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of 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 LED drive system with open circuit protecting function is provided.
Object of the present invention is by following technical proposals reality: a kind of 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.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, and the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit.
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.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1; the LED drive system with open circuit protecting function of the present invention; by the transformer T for adjusting line voltage; 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 output forms.
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, and the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit.The former limit of described transformer T is then as current input terminal.
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 (4)
1. one kind has the 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, 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.
2. a kind of LED drive system with open circuit protecting function according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises diode bridge rectifier U and electric capacity C1; Two inputs of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T secondary respectively, the positive and negative electrode of electric capacity C1 is then serially connected between two outputs of diode bridge rectifier U, and the positive and negative electrode of described electric capacity C1 is also connected with voltage stabilizing circuit.
3. a kind of LED drive system with open circuit protecting function according to claim 2, 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.
4. a kind of LED drive system with open circuit protecting function according to claim 3, 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410660842.XA CN104394619A (en) | 2014-11-18 | 2014-11-18 | LED driving system with open circuit protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104394619A true CN104394619A (en) | 2015-03-04 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410660842.XA Pending CN104394619A (en) | 2014-11-18 | 2014-11-18 | LED driving system with open circuit protection function |
| CN201510309827.5A Pending CN104936343A (en) | 2014-11-18 | 2015-06-08 | Voltage-stabilizing oscillation type LED drive system capable of open circuit protection |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510309827.5A Pending CN104936343A (en) | 2014-11-18 | 2015-06-08 | Voltage-stabilizing oscillation type LED drive system capable of open circuit protection |
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| Country | Link |
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| CN (2) | CN104394619A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017128533A1 (en) * | 2016-01-29 | 2017-08-03 | 深圳和而泰照明科技有限公司 | Protection circuit for led light source, and led light source |
-
2014
- 2014-11-18 CN CN201410660842.XA patent/CN104394619A/en active Pending
-
2015
- 2015-06-08 CN CN201510309827.5A patent/CN104936343A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017128533A1 (en) * | 2016-01-29 | 2017-08-03 | 深圳和而泰照明科技有限公司 | Protection circuit for led light source, and led light source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104936343A (en) | 2015-09-23 |
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Application publication date: 20150304 |