CN104917363A - Double-output power supply voltage stabilization protection circuit - Google Patents
Double-output power supply voltage stabilization protection circuit Download PDFInfo
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- CN104917363A CN104917363A CN201510226143.9A CN201510226143A CN104917363A CN 104917363 A CN104917363 A CN 104917363A CN 201510226143 A CN201510226143 A CN 201510226143A CN 104917363 A CN104917363 A CN 104917363A
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- power supply
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- comparator
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Abstract
The invention belongs to the technical field of direct-current power supply voltage stabilization control, and discloses a double-output power supply voltage stabilization protection circuit. The double-output power supply voltage stabilization protection circuit comprises a PMOS tube, a voltage division circuit, a comparator, a first resistor, and a first triode. The PMOS tube is connected in series to the output end of a secondary winding of a double-output power supply, and the gate of the PMOS tube is connected with the collector of the first triode. The voltage division circuit is connected between the source of the PMOS tube and the ground. A reference end of the comparator is connected with the voltage division circuit, the cathode of the comparator is connected with one end of the first resistor, and the anode of the comparator is grounded. The other end of the first resistor is connected with the source of the PMOS tube. The cathode of the comparator is further connected with the base of the first triode, the emitter of the first triode is grounded, and the collector of the first triode is connected with the gate of the PMOS tube. The double-output power supply voltage stabilization protection circuit can achieve output of stable voltage without the need for an auxiliary power supply or a filtering capacitor, and has a simple structure.
Description
Technical field
The invention belongs to DC power voltage stabilizing control technology field, be specifically related to a kind of dual output power supply protective circuit of voltage regulation.
Background technology
The needs output that the DC power supply of current use has has two groups of voltages, and needs these two voltages all more stable, in order to save cost, two being exported winding techniques on a transformer, being divided into main winding output and time winding output.Main winding output is connected with voltage sampling feedback unit, can make the output voltage stabilization of main winding output.So just there will be a problem, when main winding heavier loads, during another one time winding underloading, secondary winding voltage of underloading can be caused to exceed rated voltage a lot, and severe patient may burn load because of overtension.
Summary of the invention
In order to overcome the shortcoming of prior art with not enough; the object of the present invention is to provide a kind of dual output power supply protective circuit of voltage regulation; be arranged on the secondary winding output of dual output power supply; when main winding heavy duty; described dual output power supply protective circuit of voltage regulation can make time winding export maintenance burning voltage, and has the feature of overvoltage and short-circuit protection.
To achieve the above object of the invention, the present invention is achieved through the following technical solutions:
A kind of dual output power supply protective circuit of voltage regulation, comprises PMOS, bleeder circuit, comparator, the first resistance and the first triode; Described PMOS is connected on dual output power supply time winding output, and the grid of described PMOS is connected with the collector electrode of described first triode; Between the source electrode that described bleeder circuit is connected to described PMOS and ground connection; The reference edge of described comparator is connected with described bleeder circuit, and the negative electrode of described comparator is connected with one end of described first resistance, the plus earth of described comparator; The other end of described first resistance is connected with the source electrode of described PMOS; The negative electrode of described comparator is also connected with the base stage of described first triode, the grounded emitter of described first triode, and the collector electrode of described first triode is connected with the grid of described PMOS.
Particularly, described bleeder circuit comprises the second resistance and the 3rd resistance, and described second resistance and the 3rd resistance are for being connected in series.
Particularly, described dual output power supply protective circuit of voltage regulation also comprises the first electric capacity, and the two ends of described first electric capacity are connected with the reference edge of described comparator with the negative electrode of described comparator respectively.
Particularly; described dual output power supply protective circuit of voltage regulation also comprises the 4th resistance, the 5th resistance and the second electric capacity; described 4th resistance is connected between the negative electrode of described comparator and the base stage of described first triode; the two ends of described 5th resistance are connected with ground connection with the base stage of described first triode respectively, and the two ends of described second electric capacity are connected with ground connection with the base stage of described first triode respectively.
Particularly; described dual output power supply protective circuit of voltage regulation also comprises the 6th resistance and the 7th resistance; the two ends of described 6th resistance are connected with the grid of described PMOS with the collector electrode of described first triode respectively, and the two ends of described 7th resistance are connected with the drain and gate of described PMOS respectively.
Particularly, described comparator is TL431.
Particularly, described dual output power supply protective circuit of voltage regulation also comprises a voltage-stabiliser tube, and the negative electrode of described voltage-stabiliser tube is connected with the drain electrode of described PMOS, and the anode of described voltage-stabiliser tube is connected with the grid of described PMOS.The effect arranging voltage-stabiliser tube is the GS voltage of PMOS described in clamp, prevents spike from disturbing and is punctured by the GS interpolar of described PMOS.
Particularly; described dual output power supply protective circuit of voltage regulation also comprises output short circuit protection circuit; described output short circuit protection circuit comprises the 8th resistance, the 9th resistance and the second triode; the two ends of described 8th resistance are connected with the base stage of described second triode with the drain electrode of described PMOS respectively; the two ends of described 9th resistance are connected with the base stage of described second triode with the source electrode of described PMOS respectively; the collector electrode of described second triode is connected with the base stage of described first triode, the grounded emitter of described second triode.Described output short circuit protection circuit when output short-circuit, can protect whole circuit.
The beneficial effect that the present invention realizes is as follows:
When double winding out-put supply works, if main winding output is heavily loaded, because main winding output is provided with voltage sampling feedback unit, the voltage of main winding output can be made to keep stable, but this can cause the voltage of time winding output to be increased to exceeding load voltage value simultaneously.
By arranging dual output power supply protective circuit of voltage regulation of the present invention on secondary winding output, bleeder circuit samples from secondary winding output, when sampling voltage is greater than the reference voltage of comparator, the negative electrode of comparator presents electronegative potential, first triode is cut-off state, and now, between the GS of PMOS, no-voltage is poor, PMOS is cut-off state, and time winding output end voltage is reduced; Sampled by bleeder circuit, when sampling voltage is less than the reference voltage of comparator, the negative electrode of comparator presents high potential, and the first triode is conducting state, now, has voltage difference between the GS of PMOS, PMOS conducting, and secondary winding output voltage is constant.By above-mentioned dynamic adjustments, the voltage of time winding output is maintained and is stabilized in the range of nominal tension, available protecting load.
And; by arranging output short circuit protection circuit; when output short-circuit; the base voltage of the second triode raises, and the second triode is conducting state, is dragged down by the base voltage of the first triode; the first triode is made to be cut-off state; and then making PMOS be cut-off state, output voltage reduces, and therefore protects whole circuit.
Dual output power supply protective circuit of voltage regulation of the present invention, without the need to can realize the output of burning voltage by accessory power supply, also carries out discharge and recharge without the need to arranging filter capacitor, and circuit structure is simple, reduces equipment cost and processing cost.
Accompanying drawing explanation
Fig. 1 is the frame diagram of the existing double winding out-put supply described in embodiment;
Fig. 2 is for setting up the frame diagram of dual output power supply protective circuit of voltage regulation described in the embodiment of the present invention in existing double winding output power supply circuit;
Fig. 3 is the dual output power supply protective circuit of voltage regulation schematic diagram of the embodiment 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 thereto.
See Fig. 1, it is the frame diagram of existing double winding out-put supply.As shown in Figure 1, described double winding out-put supply comprises power input 1, EMC and the rectification filtering unit 2, elementary PWM control unit 3, secondary commutation filter unit 4, main winding output 5 and the secondary winding output 6 that are connected successively, also comprises voltage sampling feedback unit 7 simultaneously; Voltage sampling feedback unit 7 carries out sampling from secondary commutation filter unit 4 and feeds back to elementary PWM control unit 3 and controls, more specifically, voltage sampling feedback unit 7 carries out sampling from the main winding output 5 of secondary commutation filter unit 4 and feeds back to elementary PWM control unit 3, to maintain the voltage of main winding output 5 in the range of nominal tension.
When double winding out-put supply works, if main winding output 5 is heavily loaded, the voltage sampling feedback unit 7 that main winding output 5 is arranged can make the voltage of main winding output 5 keep stable, but this can cause the voltage of time winding output 6 to be increased to exceeding load voltage value simultaneously.
By arranging dual output power supply protective circuit of voltage regulation 8 of the present invention at secondary winding output 6, can make the voltage stabilization of time winding output 6 between the range of nominal tension.
In existing double winding output power supply circuit, set up the frame diagram of described dual output power supply protective circuit of voltage regulation as shown in Figure 2, described dual output power supply protective circuit of voltage regulation 8 is set in secondary winding output 6.
Wherein a kind of embodiment of dual output power supply protective circuit of voltage regulation 8 of the present invention as shown in Figure 3.
As shown in Figure 3, described dual output power supply protective circuit of voltage regulation 8 comprises PMOS U1, the bleeder circuit 11 be made up of the second resistance R2 and the 3rd resistance R3, comparator U2, the first resistance R1 and the first triode Q1;
In described dual output power supply protective circuit of voltage regulation 8, the annexation of each device is as follows:
Described PMOS U1 is connected on dual output power supply time winding output, and the grid of described PMOS U1 is connected with the collector electrode of described first triode Q1; Between the source electrode that described bleeder circuit 11 is connected to described PMOS U1 and ground connection; The reference edge of described comparator U2 is connected with described bleeder circuit 11, and the reference edge being specially comparator U2 is connected with the two ends of the 3rd resistance R3 respectively with anode; The negative electrode of described comparator U2 is connected with one end of described first resistance R1, the plus earth of described comparator U2; The other end of described first resistance R1 is connected with the source electrode of described PMOS U1; The negative electrode of described comparator U2 is also connected with the base stage of described first triode Q1, the grounded emitter of described first triode Q1, and the collector electrode of described first triode Q1 is connected with the grid of described PMOS U1.
It should be noted that, above-mentioned comparator U2 is TL431, and the reference voltage of this comparator is 2.5V or 1.25V.
And being the circuit reaching more stability and safety, described dual output power supply protective circuit of voltage regulation 8 also comprises the first electric capacity C1, the 4th resistance R4, the 5th resistance R5, the second electric capacity C2, the 6th resistance R6 and the 7th resistance R7.Each device annexation is in circuit: the two ends of described first electric capacity C1 are connected with the reference edge of described comparator U2 with the negative electrode of described comparator U2 respectively; Described 4th resistance R4 is connected between the negative electrode of described comparator U2 and the base stage of described first triode Q1, the two ends of described 5th resistance R5 are connected with ground connection with the base stage of described first triode Q1 respectively, and the two ends of described second electric capacity C2 are connected with ground connection with the base stage of described first triode Q1 respectively; The two ends of described 6th resistance R6 are connected with the grid of described PMOS U1 with the collector electrode of described first triode Q1 respectively, and the two ends of described 7th resistance R7 are connected with the drain and gate of described PMOS U1 respectively.
First electric capacity is set, described comparator generation self-oscillation can be prevented.
4th resistance, the 5th resistance and the second condenser network are set, circuit attonity can be prevented.
6th resistance and the 7th resistance play the effect of dividing potential drop.
Described dual output power supply protective circuit of voltage regulation 8 also comprises a voltage-stabiliser tube ZD1, and the negative electrode of described voltage-stabiliser tube ZD1 is connected with the drain electrode of described PMOS U1, and the anode of described voltage-stabiliser tube ZD1 is connected with the grid of described PMOS U1.The effect arranging voltage-stabiliser tube ZD1 is the GS voltage of PMOS U1 described in clamp, prevents spike from disturbing and is punctured by the GS interpolar of described PMOS U1.
Described dual output power supply protective circuit of voltage regulation 8 also comprises output short circuit protection circuit 12; described output short circuit protection circuit 12 comprises the 8th resistance R8, the 9th resistance R9 and the second triode Q2; the two ends of described 8th resistance R8 are connected with the base stage of described second triode Q2 with the drain electrode of described PMOS U1 respectively; the two ends of described 9th resistance R9 are connected with the base stage of described second triode Q2 with the source electrode of described PMOS U1 respectively; the collector electrode of described second triode Q2 is connected with the base stage of described first triode Q1, the grounded emitter of described second triode Q2.Described output short circuit protection circuit when output short-circuit, can protect whole circuit.
Described dual output power supply protective circuit of voltage regulation 8 also comprises the 3rd electric capacity C3 and the 4th electric capacity C4; the two ends of described 3rd electric capacity C3 are connected with the drain and gate of described PMOS respectively, and the two ends of described 4th electric capacity C4 are connected with grid with the source electrode of described PMOS respectively.The action time that 3rd electric capacity C3 and the 4th electric capacity C4 can extend protective circuit of voltage regulation is set.
The operation principle of described dual output power supply protective circuit of voltage regulation 8 is as follows:
By arranging dual output power supply protective circuit of voltage regulation 8 of the present invention on secondary winding output, bleeder circuit 11 samples from secondary winding output, when sampling voltage is greater than the reference voltage of comparator U2, the negative electrode of comparator U2 presents electronegative potential, first triode Q1 is cut-off state, and now, between the GS of PMOS U1, no-voltage is poor, PMOS U1 is cut-off state, and time winding output end voltage is reduced; Sampled by bleeder circuit 11, when sampling voltage is less than the reference voltage of comparator U2, the negative electrode of comparator U2 presents high potential, first triode Q1 is conducting state, now, has voltage difference between the GS of PMOS U1, PMOS U1 conducting, secondary winding output voltage is constant.By above-mentioned dynamic adjustments, the voltage of time winding output can be maintained and be stabilized in the range of nominal tension, available protecting load.
And; by arranging output short circuit protection circuit 12; when output short-circuit; the base voltage of the second triode Q2 raises, and the second triode Q2 is conducting state, is dragged down by the base voltage of the first triode Q1; the first triode Q1 is made to be cut-off state; and then making PMOS U1 be cut-off state, output voltage reduces, and therefore protects whole circuit.
It should be noted that; the embodiment of the present invention and the dual output power supply protective circuit of voltage regulation involved by other embodiments of the present invention; except comprising electronic component involved in embodiment; also comprise other elements known in those skilled in the art; in order to outstanding invention thought of the present invention; therefore, only the element relating to invention thought of the present invention is described in an embodiment of the present invention, other elements known in dual output power supply protective circuit of voltage regulation is not added and repeats.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (8)
1. a dual output power supply protective circuit of voltage regulation, is characterized in that: described dual output power supply protective circuit of voltage regulation comprises PMOS, bleeder circuit, comparator, the first resistance and the first triode; Described PMOS is connected on dual output power supply time winding output, and the grid of described PMOS is connected with the collector electrode of described first triode; Between the source electrode that described bleeder circuit is connected to described PMOS and ground connection; The reference edge of described comparator is connected with described bleeder circuit, and the negative electrode of described comparator is connected with one end of described first resistance, the plus earth of described comparator; The other end of described first resistance is connected with the source electrode of described PMOS; The negative electrode of described comparator is also connected with the base stage of described first triode, the grounded emitter of described first triode, and the collector electrode of described first triode is connected with the grid of described PMOS.
2. a kind of dual output power supply protective circuit of voltage regulation according to claim 1, it is characterized in that: described bleeder circuit comprises the second resistance and the 3rd resistance, described second resistance and the 3rd resistance are for being connected in series.
3. a kind of dual output power supply protective circuit of voltage regulation according to claim 1, is characterized in that: described comparator is TL431.
4. a kind of dual output power supply protective circuit of voltage regulation according to claim 1; it is characterized in that: described dual output power supply protective circuit of voltage regulation also comprises the first electric capacity, the two ends of described first electric capacity are connected with the reference edge of described comparator with the negative electrode of described comparator respectively.
5. a kind of dual output power supply protective circuit of voltage regulation according to claim 1; it is characterized in that: described dual output power supply protective circuit of voltage regulation also comprises the 4th resistance, the 5th resistance and the second electric capacity; described 4th resistance is connected between the negative electrode of described comparator and the base stage of described first triode; the two ends of described 5th resistance are connected with ground connection with the base stage of described first triode respectively, and the two ends of described second electric capacity are connected with ground connection with the base stage of described first triode respectively.
6. a kind of dual output power supply protective circuit of voltage regulation according to claim 1; it is characterized in that: described dual output power supply protective circuit of voltage regulation also comprises the 6th resistance and the 7th resistance; the two ends of described 6th resistance are connected with the grid of described PMOS with the collector electrode of described first triode respectively, and the two ends of described 7th resistance are connected with the drain and gate of described PMOS respectively.
7. a kind of dual output power supply protective circuit of voltage regulation according to claim 1; it is characterized in that: described dual output power supply protective circuit of voltage regulation also comprises a voltage-stabiliser tube; the negative electrode of described voltage-stabiliser tube is connected with the drain electrode of described PMOS, and the anode of described voltage-stabiliser tube is connected with the grid of described PMOS.
8. a kind of dual output power supply protective circuit of voltage regulation according to claim 1, it is characterized in that: described dual output power supply protective circuit of voltage regulation also comprises output short circuit protection circuit, described output short circuit protection circuit comprises the 8th resistance, 9th resistance and the second triode, the two ends of described 8th resistance are connected with the base stage of described second triode with the drain electrode of described PMOS respectively, the two ends of described 9th resistance are connected with the base stage of described second triode with the source electrode of described PMOS respectively, the collector electrode of described second triode is connected with the base stage of described first triode, the grounded emitter of described second triode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510226143.9A CN104917363A (en) | 2015-05-04 | 2015-05-04 | Double-output power supply voltage stabilization protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510226143.9A CN104917363A (en) | 2015-05-04 | 2015-05-04 | Double-output power supply voltage stabilization protection circuit |
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| CN104917363A true CN104917363A (en) | 2015-09-16 |
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| CN201510226143.9A Pending CN104917363A (en) | 2015-05-04 | 2015-05-04 | Double-output power supply voltage stabilization protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787659A (en) * | 2017-01-05 | 2017-05-31 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
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| CN204794665U (en) * | 2015-05-04 | 2015-11-18 | 惠州三华工业有限公司 | Two export power supply steady voltage protection circuits |
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| CN1905310A (en) * | 2006-08-01 | 2007-01-31 | 北京航空航天大学 | Low ripple high reliable high-capacity capacitance voltage stabilizing charging circuit |
| CN201975993U (en) * | 2010-12-21 | 2011-09-14 | 惠州三华工业有限公司 | Adjusting tube type series voltage stabilizing circuit |
| CN202050227U (en) * | 2011-04-11 | 2011-11-23 | 东莞启益电器机械有限公司 | Multifunctional linear voltage regulator circuit |
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| CN106787659A (en) * | 2017-01-05 | 2017-05-31 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
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