CN101909383A - Over-voltage locking protection circuit and power drive circuit using same - Google Patents
Over-voltage locking protection circuit and power drive circuit using same Download PDFInfo
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- CN101909383A CN101909383A CN2009101078110A CN200910107811A CN101909383A CN 101909383 A CN101909383 A CN 101909383A CN 2009101078110 A CN2009101078110 A CN 2009101078110A CN 200910107811 A CN200910107811 A CN 200910107811A CN 101909383 A CN101909383 A CN 101909383A
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Abstract
The invention relates to an over-voltage locking protection circuit and a power drive circuit using the same. The over-voltage locking protection circuit comprises a detection module and an action module, wherein the detection module is used for acquiring a detection signal reflecting output voltage change from a primary auxiliary winding of a transformer; and the action module is used for outputting an action signal for cutting an output voltage off according to the detection signal, and locking the action signal. The power drive circuit comprises the transformer, an input circuit connected to a primary winding of the transformer, an output circuit connected to a secondary winding of the transformer, a control module used for controlling the output voltage of the output circuit, and the over-voltage locking protection circuit connected to the primary auxiliary winding of the transformer to control the control module to realize the locking protection of the output voltage. The over-voltage locking protection circuit and the power drive circuit of the invention have simple and reliable circuit design, and can realize the locking protection of the output voltage at a primary stage so as to achieve ideal output over-voltage protection effect.
Description
Technical field
The output over-voltage protection circuit that the present invention relates to use in the power driving circuit, more particularly, the power driving circuit that relates to a kind of over-voltage locking protection circuit and use this circuit.
Background technology
Because led light source possesses characteristics such as energy-efficient, that the life-span is long, low pressure is controlled, therefore be widely used in the indoor and outdoor lighting in each field.In its practical application, the output over-voltage protection function of LED power driving circuit is particularly important.This be because, when open loop of LED both end voltage or voltage failure rising, not only can bring dangerous high pressure, also can damage driver and light source.In addition, if led driver is an insulating power supply, when it being protected by secondary protective circuit, the protective circuit of use meeting more complicated, and this has not only increased cost, has also reduced reliability.
Therefore need a kind of simple and reliable and can be at the over-voltage locking protection circuit of elementary realization output over-voltage protection.
Summary of the invention
The technical problem to be solved in the present invention is, at the defective that the over-voltage locking protection circuit design is complicated, cost is higher and reliability is lower of prior art, provides a kind of simple and reliable and can be at the over-voltage locking protection circuit of elementary realization output over-voltage protection.
The present invention solves first technical scheme that its technical problem adopts: construct a kind of over-voltage locking protection circuit, comprising:
Detection module is used for obtaining the detection signal that the reflection output voltage changes from the elementary auxiliary winding of transformer;
Action module is used for according to described detection signal that the actuating signal of described output voltage is closed in output and with described actuating signal locking.
In over-voltage locking protection circuit of the present invention; described detection module comprises voltage-stabiliser tube, first resistance and first diode; the negative pole of wherein said voltage-stabiliser tube is connected to the elementary auxiliary winding, anodal through described first grounding through resistance of described transformer, and the anode of described first diode is connected to the negative pole of described voltage-stabiliser tube, negative electrode is connected to described action module.
In over-voltage locking protection circuit of the present invention, described action module comprises second resistance, first triode, second triode and second diode; Wherein said second resistance, one end is connected to power supply, the other end is connected to the emitter of described second triode, the base stage of described second triode is connected to the negative electrode of described second diode and the collector electrode of described first triode, the collector electrode of described second triode is connected to the base stage of described first triode, and the grounded emitter of described first triode, collector electrode are connected to the negative electrode of described second diode; The anode of described second diode is exported described actuating signal.
In over-voltage locking protection circuit of the present invention, described action module also comprises first error actuating circuit that is used to prevent the described first triode misoperation.
In over-voltage locking protection circuit of the present invention, described first error actuating circuit comprises base stage and first electric capacity between the emitter and the 3rd resistance that is connected to described first triode.
In over-voltage locking protection circuit of the present invention, described action module also comprises second error actuating circuit that is used to prevent the described second triode misoperation.
In over-voltage locking protection circuit of the present invention, described second error actuating circuit comprises emitter and second electric capacity between the base stage and the 4th resistance that is connected to described second triode.
In over-voltage locking protection circuit of the present invention, the N type triode of described first triode; Described second triode is a P type triode.
The present invention solves second technical scheme that its technical problem adopts: construct a kind of power driving circuit; comprise transformer, be connected the input circuit of the elementary winding of described transformer; be connected the output circuit of described Secondary winding of transformer; and the control module that is used to control described output circuit output voltage, comprise further also that wherein the elementary auxiliary winding that is connected described transformer is to control the over-voltage locking protection circuit that described control module realizes the locking protection of output voltage.
In power driving circuit of the present invention, described over-voltage locking protection circuit comprises:
Detection module is used for obtaining the detection signal that is used to reflect the output voltage variation from the elementary auxiliary winding of transformer;
Action module is used for according to described detection signal that the actuating signal of described output voltage is closed in output and with described actuating signal locking.
In power driving circuit of the present invention, described detection module comprises voltage-stabiliser tube, first resistance and first diode, the negative pole of wherein said voltage-stabiliser tube is connected to the elementary auxiliary winding, anodal through described first grounding through resistance of described transformer, and the anode of described first diode is connected to the negative pole of described voltage-stabiliser tube, negative electrode is connected to described action module.
In power driving circuit of the present invention, described action module comprises second resistance, first triode, second triode and second diode; Wherein said second resistance, one end is connected to power supply, the other end is connected to the emitter of described second triode, the base stage of described second triode is connected to the negative electrode of described second diode and the collector electrode of described first triode, the collector electrode of described second triode is connected to the base stage of described first triode, and the grounded emitter of described first triode, collector electrode are connected to the negative electrode of described second diode; The anode of described second diode is exported described actuating signal to described control module closing with control output voltage.
In power driving circuit of the present invention, described action module also comprises first error actuating circuit that is used to prevent the described first triode misoperation.
In power driving circuit of the present invention, described first error actuating circuit comprises base stage and first electric capacity between the emitter and the 3rd resistance that is connected to described first triode.
In power driving circuit of the present invention, described action module also comprises second error actuating circuit that is used to prevent the described second triode misoperation.
In power driving circuit of the present invention, described second error actuating circuit comprises emitter and second electric capacity between the base stage and the 4th resistance that is connected to described second triode.
In power driving circuit of the present invention, the N type triode of described first triode; Described second triode is a P type triode.
Implement over-voltage locking protection circuit of the present invention and power driving circuit; use simple circuit to obtain detection signal and obtain output overvoltage locking protection according to this detection signal from the elementary of transformer; therefore not only has the simple and reliable beneficial effect of circuit design; but also can further reach desirable output over-voltage protection effect in elementary realization.In addition, over-voltage locking protection circuit of the present invention and power driving circuit have also adopted error actuating circuit, have therefore further improved the reliability of circuit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram of first embodiment of over-voltage locking protection circuit of the present invention;
Fig. 2 is the circuit theory diagrams of second embodiment of over-voltage locking protection circuit of the present invention;
Fig. 3 is the circuit theory diagrams of the 3rd embodiment of over-voltage locking protection circuit of the present invention;
Fig. 4 is the theory diagram of first embodiment of power driving circuit of the present invention;
Fig. 5 is the circuit theory diagrams of second embodiment of power driving circuit of the present invention.
Embodiment
Fig. 1 is the theory diagram of first embodiment of over-voltage locking protection circuit of the present invention.As shown in Figure 1, over-voltage locking protection circuit of the present invention comprises detection module 100, is used for obtaining the detection signal that the reflection output voltage changes from the elementary auxiliary winding of transformer; Action module 200 is used for according to described detection signal that the actuating signal of described output voltage is closed in output and with described actuating signal locking.In a preferred embodiment of the invention, described action module 200 can generate the actuating signal of a controllable power PWM chip according to described detection signal, this actuating signal can be offered the feedback pin of power supply PWM chip, thereby close output voltage, then this action module 200 can lock this actuating signal (level that for example this actuating signal is set in inefficacy), thereby realizes lock function.The present invention can be by using the locking protection of simple and reliable circuit at the output voltage of elementary realization thus.
In other embodiments of the invention, those skilled in the art also can adopt other known chips, control as power supply chips such as PFM.Those skilled in the art can change the present invention under instruction of the present invention, thereby adapt to the application of different chips.In the present embodiment, described detection signal is the elementary auxiliary winding supply power voltage of transformer, and it can reflect the variation of output voltage by the coupling of transformer.
Fig. 2 is the circuit theory diagrams of second embodiment of over-voltage locking protection circuit of the present invention.As shown in Figure 2, over-voltage locking protection circuit of the present invention comprises detection module 100 and action module 200.Detection module 100 is made up of voltage-stabiliser tube Z1, resistance R 3, diode D1, wherein the voltage-stabiliser tube Z1 negative pole elementary auxiliary winding that connects transformer is with the elementary auxiliary winding supply power voltage that obtains transformer, anodal through resistance R 3 ground connection, and negative pole, negative electrode that the anode of diode D1 is connected to described voltage-stabiliser tube Z1 are connected to described action module 200.Described action module 200 comprises triode Q1, Q2, diode D2 and resistance R 1, wherein an end of resistance R 1 is connected to power Vcc, the other end is connected to the emitter of triode Q2, the base stage of triode Q2 is connected to the negative electrode of diode D2 and the collector electrode of triode Q1, and the grounded emitter of triode Q1, collector electrode are connected to the base stage of negative electrode and the triode Q2 of described diode D2.Its operation principle is as follows, when surpassing the magnitude of voltage of voltage-stabiliser tube Z1 setting from the detected supply power voltage signal of the elementary auxiliary winding of transformer, triode Q1 obtains a high level saturation conduction, and the actuating signal of diode D2 output is dragged down, thus powered-down output.Triode Q2 is also open-minded after base stage drags down, thereby makes power Vcc be applied to triode Q1 base stage so that high level to be provided by resistance R 1, thereby realizes lock function.
Fig. 3 is the circuit theory diagrams of the 3rd embodiment of over-voltage locking protection circuit of the present invention.Fig. 3 and Fig. 2 are similar substantially, and its difference is, has increased the error actuating circuit that is used to prevent triode Q2 and Q1 misoperation.Second error actuating circuit that is made of resistance R 2 and capacitor C 1 is connected between the emitter and base stage of described triode Q2, is used to prevent that triode Q2 from producing misoperation.First error actuating circuit that is made of resistance R 4 and capacitor C 2 is connected between the emitter and base stage of described triode Q1, is used to prevent that triode Q1 from producing misoperation.Embodiment as shown in Figure 3, described triode Q1 are N type triodes, and triode Q2 is a P type triode.
Fig. 4 is the theory diagram of first embodiment of power driving circuit of the present invention.As shown in Figure 4; power driving circuit of the present invention comprises transformer 300, is connected the input circuit 400 of the elementary winding of described transformer; be connected the output circuit 500 of described Secondary winding of transformer; and the pwm chip 600 that is used to control described output circuit output voltage, and the elementary auxiliary winding that is connected described transformer is realized the over-voltage locking protection circuit 700 of the locking protection of output voltages to control described pwm chip 600.Can make up described over-voltage locking protection circuit 700 with reference to arbitrary embodiment among Fig. 1-3.
Fig. 5 is the circuit theory diagrams of second embodiment of power driving circuit of the present invention.As shown in Figure 5, it is the LED power driving circuit of a 10W, and output over-voltage protection circuit part is wherein realized reaching desirable output over-voltage protection locking effect with the synthetic circuit of simple set of devices.In this embodiment, press locking protection circuit to comprise detection module and action module.Detection module is made up of voltage-stabiliser tube Z1, resistance R 25, diode D11, wherein the voltage-stabiliser tube Z1 negative pole elementary auxiliary winding that connects transformer is with the detection signal that obtains the reflection output voltage and change, anodal through resistance R 3 ground connection, and negative pole, negative electrode that the anode of diode D11 is connected to described voltage-stabiliser tube Z1 are connected to described action module 200.Action module is by triode Q2, Q3, resistance R 12,27, R26, capacitor C 11, C12, and diode D12 forms.Diode D12 negative pole connects the collector electrode of triode Q3, anodal output action signal, and it is connected to the feedback signal pin of power supply PWM chip, and this signal receives low level and can realize driver is closed.Triode Q3 is a N type triode, and triode Q2 is a P type triode.The collector electrode of triode Q3 is connected with the base stage of triode Q2, the grounded emitter of triode Q3, and the base stage of triode Q3 is connected with the collector electrode of triode Q2.The emitter of P type triode Q2 is connected to power Vcc by resistance R 12.Resistance R 27 and capacitor C 12 are attempted by base stage and the emitter two ends of triode Q2, prevent its misoperation, resistance R 26, capacitor C 11 is connected between the base stage and emitter of Q1, prevent triode Q3 misoperation, when detectable voltage signals surpassed the magnitude of voltage of voltage-stabiliser tube Z1 setting, triode Q3 obtained a high level saturation conduction, thereby made the actuating signal powered-down output of diode D12 output low level.Triode Q2 is also open-minded after base stage drags down, thereby makes the power Vcc by resistance R 12 be added in triode Q3 base stage, so that high level to be provided, realizes lock function.Detection signal among this embodiment is the elementary auxiliary winding supply power voltage of transformer, and it can reflect the variation of output voltage by the coupling of transformer.
Implement over-voltage locking protection circuit of the present invention and power driving circuit, have following beneficial effect: circuit design is simple and reliable, and can be in elementary realization, thereby can reach desirable output over-voltage protection effect.In addition, over-voltage locking protection circuit of the present invention and power driving circuit have also adopted error actuating circuit, have therefore further improved the reliability of circuit.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (10)
1. an over-voltage locking protection circuit is characterized in that, comprising:
Detection module (100) is used for obtaining the detection signal that the reflection output voltage changes from the elementary auxiliary winding of transformer;
Action module (200) is used for according to described detection signal that the actuating signal of described output voltage is closed in output and with described actuating signal locking.
2. over-voltage locking protection circuit according to claim 1; it is characterized in that; described detection module (100) comprises voltage-stabiliser tube, first resistance and first diode; the negative pole of wherein said voltage-stabiliser tube is connected to the elementary auxiliary winding, anodal through described first grounding through resistance of described transformer, and the anode of described first diode is connected to the negative pole of described voltage-stabiliser tube, negative electrode is connected to described action module (200).
3. over-voltage locking protection circuit according to claim 1 is characterized in that, described action module (200) comprises second resistance, first triode, second triode and second diode; Wherein said second resistance, one end is connected to power supply, the other end is connected to the emitter of described second triode, the base stage of described second triode is connected to the negative electrode of described second diode and the collector electrode of described first triode, the collector electrode of described second triode is connected to the base stage of described first triode, and the grounded emitter of described first triode, collector electrode are connected to the negative electrode of described second diode; The anode of described second diode is exported described actuating signal.
4. over-voltage locking protection circuit according to claim 3 is characterized in that, described action module (200) also comprises first error actuating circuit that is used to prevent the described first triode misoperation.
5. over-voltage locking protection circuit according to claim 4 is characterized in that, described first error actuating circuit comprises base stage and first electric capacity between the emitter and the 3rd resistance that is connected to described first triode.
6. over-voltage locking protection circuit according to claim 3 is characterized in that, described action module (200) also comprises second error actuating circuit that is used to prevent the described second triode misoperation.
7. over-voltage locking protection circuit according to claim 6 is characterized in that, described second error actuating circuit comprises emitter and second electric capacity between the base stage and the 4th resistance that is connected to described second triode.
8. according to claim 5 or 7 described over-voltage locking protection circuits, it is characterized in that the N type triode of described first triode; Described second triode is a P type triode.
9. power driving circuit; comprise transformer (300), be connected the input circuit (400) of the elementary winding of described transformer; be connected the output circuit (500) of described Secondary winding of transformer; and the control module (600) that is used to control described output circuit output voltage; it is characterized in that, comprise that further the elementary auxiliary winding that is connected described transformer is to control the over-voltage locking protection circuit (700) that described control module (600) realizes the locking protection of output voltage.
10. power driving circuit according to claim 9 is characterized in that, described over-voltage locking protection circuit (700) comprising:
Detection module (100) is used for obtaining the detection signal that is used to reflect the output voltage variation from the elementary auxiliary winding of transformer;
Action module (200) is used for according to described detection signal that the actuating signal of described output voltage is closed in output and with described actuating signal locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910107811 CN101909383B (en) | 2009-06-02 | 2009-06-02 | Over-voltage locking protection circuit and power drive circuit using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910107811 CN101909383B (en) | 2009-06-02 | 2009-06-02 | Over-voltage locking protection circuit and power drive circuit using same |
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| Publication Number | Publication Date |
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| CN101909383A true CN101909383A (en) | 2010-12-08 |
| CN101909383B CN101909383B (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910107811 Active CN101909383B (en) | 2009-06-02 | 2009-06-02 | Over-voltage locking protection circuit and power drive circuit using same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986043A (en) * | 2010-12-03 | 2011-03-16 | 天津商业大学 | Home heating system using domestic water as low-temperature heat source |
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN103945593A (en) * | 2013-01-22 | 2014-07-23 | 上海鸣志自动控制设备有限公司 | LED driving hot swap control circuit |
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| CN87102142A (en) * | 1987-05-12 | 1988-11-30 | 施木贵 | Automatically protected driving circuit |
| CN1017672B (en) * | 1991-04-22 | 1992-07-29 | 西安交通大学 | Abnormal state protection circuit for inverter |
| CN100418368C (en) * | 2003-11-01 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Device for turning off overdriven color TV set |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | Switch power supply |
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2009
- 2009-06-02 CN CN 200910107811 patent/CN101909383B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102142A (en) * | 1987-05-12 | 1988-11-30 | 施木贵 | Automatically protected driving circuit |
| CN1017672B (en) * | 1991-04-22 | 1992-07-29 | 西安交通大学 | Abnormal state protection circuit for inverter |
| CN100418368C (en) * | 2003-11-01 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Device for turning off overdriven color TV set |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | Switch power supply |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986043A (en) * | 2010-12-03 | 2011-03-16 | 天津商业大学 | Home heating system using domestic water as low-temperature heat source |
| CN102573182A (en) * | 2010-12-22 | 2012-07-11 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102573182B (en) * | 2010-12-22 | 2014-05-07 | 海洋王照明科技股份有限公司 | Driving protection circuit and lamp |
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN102761252B (en) * | 2012-07-25 | 2015-05-27 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching metal oxide semiconductor (MOS) tube |
| CN103945593A (en) * | 2013-01-22 | 2014-07-23 | 上海鸣志自动控制设备有限公司 | LED driving hot swap control circuit |
| CN103945593B (en) * | 2013-01-22 | 2016-08-03 | 上海鸣志自动控制设备有限公司 | A kind of LED drives hot plug control circuit |
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| CN101909383B (en) | 2013-04-17 |
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