CN102790379B - Novel fault protection self-repairing circuit - Google Patents
Novel fault protection self-repairing circuit Download PDFInfo
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- CN102790379B CN102790379B CN201210257041.XA CN201210257041A CN102790379B CN 102790379 B CN102790379 B CN 102790379B CN 201210257041 A CN201210257041 A CN 201210257041A CN 102790379 B CN102790379 B CN 102790379B
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Abstract
The invention relates to a novel fault protection self-repairing circuit, which comprises a voltage sampling circuit used for acquiring the output voltage of a protected circuit, wherein the output ends of both the voltage sampling circuit and a voltage reference circuit are connected with the input end of a comparison circuit; the output end of the comparison circuit is respectively connected with a power control circuit of the protected circuit and the input end of the self-repairing circuit; and the output end of the self-repairing circuit is connected with the input end of the voltage reference circuit. Due to the adoption of the novel fault protection self-repairing circuit provided by the invention, in case of fault, a normal auxiliary power source can be independently output so as to not only ensure normal working of some functions of the power, such as prewarning, but also guarantee that the power can automatically restore to a normal state without being restarted once the fault is solved. The novel fault protection self-repairing circuit can not only realize the continuity of auxiliary power supplying, and but also achieve a self-repairing fault-protection function of high precision, high reliability and low cost, and is very suitable for special and complex fields.
Description
Technical field
The present invention relates to field of switch power, especially a kind of novel fault protection self-repairing circuit.
Background technology
Along with the development of science and technology, Switching Power Supply enters various sophisticated electronic, electric equipment field in succession, as stored-program control exchange, communication, industrial control equipment power supply etc., all employs Switching Power Supply widely.The develop rapidly of new and high technology and application also itself proposes higher requirement to Switching Power Supply, comprise more efficiently, more high power density, more improve defencive function, more convenient Based Intelligent Control etc.
In order to protection switch power supply self and the safety of load system, make Switching Power Supply still can work safely and reliably and protect load system under adverse circumstances and catastrophic failure situation, need to export failure protection function accurately.Traditional output protection circuit is powered by independently auxiliary source, therefore exports always in normal situation at guarantee auxiliary power supply, cannot realize the self-recovering function of main circuit, must restart and power supply just can be made again to recover normal.
Summary of the invention
The object of the present invention is to provide a kind of when fault occurs, independently normal auxiliary source output can be provided, again can after trouble shooting, without the need to restarting the novel fault protection self-repairing circuit that power supply just can be made automatically to return to normal condition.
For achieving the above object, present invention employs following technical scheme: a kind of novel fault protection self-repairing circuit, comprise the voltage sampling circuit for gathering protected circuit output voltage, the output of voltage sampling circuit, voltage reference circuit is all connected with the input of comparison circuit, the output of comparison circuit is connected with the power control circuit of protected circuit, the input of self-repairing circuit respectively, and the output of self-repairing circuit is connected with the input of voltage reference circuit; Described voltage sampling circuit comprises for gathering protected circuit output voltage V
outsample resistance R1, one end of described resistance R1 is connected with the output of protected circuit, and the other end of resistance R1 is connected with the normal phase input end of comparator U1B; Described comparison circuit comprises comparator U1A, U1B; the inverting input of described comparator U1B is by electric capacity C2 ground connection; the normal phase input end of comparator U1B connects+15V direct current by resistance R11; the output of comparator U1B divides two-way to export; + 15V direct current is connect on the one hand by resistance R4; be connected with its normal phase input end by resistance R3 on the other hand; the output of comparator U1B is connected with the inverting input of comparator U1A, and the output of comparator U1A is connected with the power control circuit of protected circuit.
As shown from the above technical solution, the present invention both can, when fault occurs, provide independently normal auxiliary source to export, to ensure that such as the early warning of the partial function of power supply can normally work, again can after trouble shooting, make power supply automatically return to normal condition and without the need to restarting.The present invention both can realize auxiliary power supply and continue, and can realize again the self-recoverage failure protection function of high accuracy, high reliability, low cost, very applicable in Special complex field.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
A kind of novel fault protection self-repairing circuit; comprise the voltage sampling circuit 1 for gathering protected circuit output voltage; the output of voltage sampling circuit 1, voltage reference circuit 3 is all connected with the input of comparison circuit 2; the output of comparison circuit 2 is connected with the power control circuit of protected circuit, the input of self-repairing circuit 4 respectively, and the output of self-repairing circuit 4 is connected with the input of voltage reference circuit 3.Described voltage sampling circuit 1 comprises for gathering protected circuit output voltage V
outsample resistance R1, described comparison circuit 2 comprises comparator U1A, U1B, and described voltage reference circuit 3 comprises resistance R5, R6, and described self-repairing circuit 4 comprises switching tube, and switching tube can adopt triode or field effect transistor, as shown in Figure 1.
As shown in Figure 1, one end of described resistance R1 is connected with the output of protected circuit, and the other end of resistance R1 is connected with the normal phase input end of comparator U1B.The inverting input of described comparator U1B is by electric capacity C2 ground connection; the normal phase input end of comparator U1B connects+15V direct current by resistance R11; the output of comparator U1B divides two-way to export; + 15V direct current is connect on the one hand by resistance R4; be connected with its normal phase input end by resistance R3 on the other hand; the output of comparator U1B is connected with the inverting input of comparator U1A, and the output of comparator U1A is connected with the power control circuit of protected circuit.
As shown in Figure 1, a termination+5V reference voltage V of described resistance R5
ref, the other end of resistance R5 is connected with one end of resistance R6, the other end ground connection of resistance R6.Described switching tube is triode Q1, its grounded emitter, its base stage is connected with one end of resistance R8, R10 respectively, the other end ground connection of resistance R8, the other end of resistance R10 is connected with the output of comparator U1A, the collector electrode of triode Q1 is connected with one end of resistance R2, R7 respectively, the other end of resistance R2 divides two aspects to export, be connected with the inverting input of comparator U1B on the one hand, on the other hand by electric capacity C2 ground connection, the other end of resistance R7 is connected with one end of resistance R5, and the normal phase input end of comparator U1A is connected between resistance R5, R6.
Below in conjunction with Fig. 1, the present invention is further illustrated.
1st step, at the normal open state of power supply:
Because power supply possesses auxiliary power supply, so Vcc15V first sets up or exists all the time, V5=3V, V1=V6=9.1V, V7=Vctr=0, protected circuit power control circuit does not work, and power supply possesses the ability performing boot action;
Now Vout due to protected circuit supply delayed, Vout is still 0V; V3 equals 0.714V according to theory calculate; Vref5V is slowly charged to electric capacity C2 by resistance R7, R2, due to the time delay of electric capacity C2, make start a period of time t1(adjustable) in V3 > V2, so V1 is about 9V; Simultaneously due to the positive feedback effect of resistance R3, V3 current potential is made to rise to 1.3V at once;
Now V1=V6=9.1V, and V5=3V, so V7=Vctr=0, the power control circuit of protected circuit does not work, Vb=0V, and triode Q2 is in cut-off state, and power supply performs boot action, normally provides Vout=9V;
Meanwhile, due to V7=Vctr=0V, so Vb=0V, triode Q2 is in cut-off state, and Vref5V will continue through resistance R7, R2 and slowly charge to electric capacity C2, until V2=5V;
Visible, in start power up, V3 voltage is greater than V2 voltage all the time, and Vctr is always electronegative potential, and the present invention does not work, therefore power supply normally starts.
2nd step, protection act:
When power supply and protected circuit malfunctions, Vout=0V, V3=1.3V, due to now V2=5V, so comparator U1B overturns, V1=0V;
Again because the existence of positive feedback resistor R3, V3 voltage is pulled down to 0.714V at once, and make the output of V1 by dullness, very clean is pulled down to 0 current potential;
Now V1=V6=0V, V5=3V, comparator U1A overturn, and V7 exports high potential, V7=Vctr=14.2V, and the output of protected circuit is closed in work of the present invention.
3rd step, self-recoverage action:
As V7=Vctr=14.2V, Vb voltage is lifted to 2.5V equally, makes triode Q1 open-minded, and Vc point current potential is pulled down to 0.3V, is stored in the energy of electric capacity C2 simultaneously, namely the voltage of V2 is slowly discharged by resistance R2, until be less than 0.714V;
V3 voltage is 0.714V, and after V2 is less than 0.714V, comparator U1B overturns again, and V1 exports high potential, and now due to the positive feedback effect of resistance R3, make V3 current potential rise to 1.3V rapidly, V2 is 0.714V this moment, and still in continuation discharge condition;
Due to the existence of resistance R3 positive feedback, based on above analyze known, V3 in a period of time t2 higher than V2, so V1 continued to export high potential, V1=V6=9.1V within the t2 time; Now V5=5V, comparator U1A overturn, and V7 exports electronegative potential, V7=Vctr=0V, and the present invention does not work, and power supply performs normal starting operation;
V7=Vctr=0V, so Vb=0V, triode Q2 is in cut-off state, and Vref5V will continue through resistance R7, R2 and slowly charge to electric capacity C2, until V2=5V.
4th step, the non-disarm state of output fault:
From the above analysis, power supply starts to perform normal starting operation, but does not remove due to output fault, and it is so low level that Vout appoints, therefore V3=1.3V is constant;
Now triode Q2 is still in cut-off state, and Vref5V is charged, until be greater than 1.3V to V2 from 0.714V by resistance R7, R2;
When after V2 > V3; comparator U1B overturns; V1=V6=0V, because V5 is always 5V, so V5 > V6; comparator U1A overturns again; V7=Vctr=14.2V, triggers the present invention again, thus closes the output of protected circuit; and repeat the 3rd, the 4th step, enter circulation.
5th step, output malfunction disarm state:
From the above analysis, power supply is not before output fault is removed, all the time---self-recoverage---shutoff---the self-healing circulation that is in shutoff, when power supply is when after output trouble shooting, Vout will become high potential, and V3 voltage rises to 9.5V by 1.3V, V3 > V2, comparator U1B overturns, V1=V6=9.1V;
Due to V5=5V, so V7=Vctr=0V, the present invention no longer works, and power supply enters normal operating condition.
Visible, this circuit both can realize auxiliary power supply to be continued, and can realize again the self-recoverage failure protection function of high accuracy, high reliability, low cost, very applicable in Special complex field.
Adopt the present invention; can under auxiliary power supply continues the prerequisite provided; realize the fine adjustment of Arbitrary Fault protection point; realize the accurate control of protection interval time; realize the self-recovering function after protection, export with limit average power, effectively protect power supply itself and load system; and it is low to possess cost, the feature that reliability is high.
Claims (4)
1. a novel fault protection self-repairing circuit, it is characterized in that: comprise the voltage sampling circuit (1) for gathering protected circuit output voltage, the output of voltage sampling circuit (1), voltage reference circuit (3) is all connected with the input of comparison circuit (2), the output of comparison circuit (2) is connected with the power control circuit of protected circuit, the input of self-repairing circuit (4) respectively, and the output of self-repairing circuit (4) is connected with the input of voltage reference circuit (3); Described voltage sampling circuit (1) comprises for gathering protected circuit output voltage V
outsample resistance R1, one end of described resistance R1 is connected with the output of protected circuit, and the other end of resistance R1 is connected with the normal phase input end of comparator U1B; Described comparison circuit (2) comprises comparator U1A, U1B; the inverting input of described comparator U1B is by electric capacity C2 ground connection; the normal phase input end of comparator U1B connects+15V direct current by resistance R11; the output of comparator U1B divides two-way to export; + 15V direct current is connect on the one hand by resistance R4; be connected with its normal phase input end by resistance R3 on the other hand; the output of comparator U1B is connected with the inverting input of comparator U1A, and the output of comparator U1A is connected with the power control circuit of protected circuit.
2. novel fault protection self-repairing circuit according to claim 1, is characterized in that: described voltage reference circuit (3) comprises resistance R5, R6, and described self-repairing circuit (4) comprises switching tube.
3. novel fault protection self-repairing circuit according to claim 2, is characterized in that: a termination+5V reference voltage V of described resistance R5
ref, the other end of resistance R5 is connected with one end of resistance R6, the other end ground connection of resistance R6.
4. novel fault protection self-repairing circuit according to claim 2, it is characterized in that: described switching tube is triode Q1, its grounded emitter, its base stage respectively with resistance R8, one end of R10 is connected, the other end ground connection of resistance R8, the other end of resistance R10 is connected with the output of comparator U1A, the collector electrode of triode Q1 respectively with resistance R2, one end of R7 is connected, the other end of resistance R2 divides two aspects to export, be connected with the inverting input of comparator U1B on the one hand, on the other hand by electric capacity C2 ground connection, the other end of resistance R7 is connected with one end of resistance R5, the normal phase input end of comparator U1A is connected on resistance R5, between R6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210257041.XA CN102790379B (en) | 2012-07-24 | 2012-07-24 | Novel fault protection self-repairing circuit |
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| CN201210257041.XA CN102790379B (en) | 2012-07-24 | 2012-07-24 | Novel fault protection self-repairing circuit |
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| CN102790379A CN102790379A (en) | 2012-11-21 |
| CN102790379B true CN102790379B (en) | 2015-04-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101174769A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | Self-recovery multifunctional protection circuit |
| CN101599701A (en) * | 2009-07-02 | 2009-12-09 | 成都芯源系统有限公司 | Switching power supply with fault protection function and control method thereof |
| CN101877545A (en) * | 2009-04-30 | 2010-11-03 | 鸿富锦精密工业（深圳）有限公司 | Power module |
| CN102412550A (en) * | 2011-12-26 | 2012-04-11 | 川铁电气（天津）集团有限公司 | Adjustable current-limiting protection circuit on direct current loop |
| CN202817720U (en) * | 2012-07-24 | 2013-03-20 | 合肥华耀电子工业有限公司 | A novel fault-protection self-recovery circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007336739A (en) * | 2006-06-16 | 2007-12-27 | Yokowo Co Ltd | Protective circuit |
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- 2012-07-24 CN CN201210257041.XA patent/CN102790379B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174769A (en) * | 2006-10-31 | 2008-05-07 | 中兴通讯股份有限公司 | Self-recovery multifunctional protection circuit |
| CN101877545A (en) * | 2009-04-30 | 2010-11-03 | 鸿富锦精密工业（深圳）有限公司 | Power module |
| CN101599701A (en) * | 2009-07-02 | 2009-12-09 | 成都芯源系统有限公司 | Switching power supply with fault protection function and control method thereof |
| CN102412550A (en) * | 2011-12-26 | 2012-04-11 | 川铁电气（天津）集团有限公司 | Adjustable current-limiting protection circuit on direct current loop |
| CN202817720U (en) * | 2012-07-24 | 2013-03-20 | 合肥华耀电子工业有限公司 | A novel fault-protection self-recovery circuit |
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| CN102790379A (en) | 2012-11-21 |
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