CN204167996U - A kind of power supply alternating current-direct current input-switching circuit - Google Patents
A kind of power supply alternating current-direct current input-switching circuit Download PDFInfo
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- CN204167996U CN204167996U CN201420571836.2U CN201420571836U CN204167996U CN 204167996 U CN204167996 U CN 204167996U CN 201420571836 U CN201420571836 U CN 201420571836U CN 204167996 U CN204167996 U CN 204167996U
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- resistance
- pin
- triode
- optocoupler
- power supply
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Abstract
The utility model relates to field of switch power technology, discloses a kind of power supply alternating current-direct current input-switching circuit, comprising: the voltage of 220VAC after rectifier bridge V1 is connected to 1,2 pin of optocoupler 3 by resistance R1, R2; 4 pin of optocoupler meet peripheral circuit+12V, and 3 pin of optocoupler are extremely connected with the B of triode G5, G9 respectively by resistance R4, R8, and the C pole of triode G5 is connected with 2 pin of resistance R6, metal-oxide-semiconductor driving chip 10, the outside PWM1 drive singal of another termination of resistance R6; The C pole of triode G9 is connected with 4 pin of resistance R7, metal-oxide-semiconductor driving chip 10, and the outside PWM2 signal of another termination of resistance R7, the E of two triode G5, G9 is extremely all connected to+12VG.It is few, simple and convenient that the utility model has use device, and handoff response speed is fast, and reliability is high, has a wide range of applications in alternating current-direct current input-switching circuit.
Description
Technical field
The utility model relates to a kind of field of switch power technology, particularly relates to a kind of power supply alternating current-direct current input-switching circuit.
Background technology
For most of Switching Power Supply, input voltage is mains 220VAC.But when alternating current 220VAC occurs that exception or electric power system have a power failure, when some special electricity consumption occasion also will ensure that power supply has output, power supply just needs direct current supply.For such power supply, generally adopt port redundancy, namely the mode of two cover circuit realizes.A set of normal civil power input, another set of direct current input for subsequent use.But when how to make civil power without input, automatically allow it be switched to a road of direct current input, or when electric main is normal, mask a road of direct current input.Such switching, just needs to take corresponding circuit to realize.
Summary of the invention
That the utility model provides a kind of power supply alternating current-direct current input-switching circuit for above-mentioned technical problem to be solved, when this circuit can be implemented in civil power work, power supply prioritizing selection civil power 220VAC.When city's electrical anomaly or mains failure, power supply automatically switches to DC power supply.Thus guarantee that power supply has output always.The interchange input and the direct current that solve power supply input switching problem.Circuit design is convenient, and reliability is high.
In order to realize the object solved the problems of the technologies described above, the utility model have employed following technical scheme:
A kind of power supply alternating current-direct current input-switching circuit, peripheral main circuit is two-tube DC/DC change-over circuit, comprise: the positive voltage terminal of peripheral circuit input 220VAC after rectifier bridge V1 is connected to one end of resistance 1, the other end of resistance 1 is connected to one end of resistance 2, the other end of resistance 2 is connected to 1 pin of optocoupler 3, and 2 pin of optocoupler 3 connect the negative of the voltage after rectifier bridge V1.4 pin of optocoupler are just connecing peripheral circuit+12V accessory power supply, 3 pin of optocoupler 3 are connected to one end of resistance 4, one end of resistance 8, the other end of resistance 4 is connected to the B pole of triode 5, the C pole of triode 5 is connected to one end of resistance 6,2 pin of metal-oxide-semiconductor driving chip 10, the outside PWM1 drive singal of another termination of resistance 6, the other end of resistance 8 is connected to the B pole of triode 9, the C pole of triode 9 is connected to 4 pin of one end of resistance 7,10 of metal-oxide-semiconductor driving chip, the outside PWM2 signal of another termination of resistance 7, the E of two triodes is extremely all connected to+12VG.
By adopting technique scheme, the utility model has following beneficial effect:
A kind of power supply alternating current-direct current input-switching circuit of the utility model, solve power supply when AC dump or exception, be switched to the problem of direct current supply, circuit is simple, fast response time.
Accompanying drawing explanation
Be a kind of alternating current-direct current input-switching circuit connection diagram of the present utility model in Fig. 1 dotted line frame, frame is outward major peripheral circuit.
Embodiment
Below in conjunction with accompanying drawing, further explanation is explained to this patent.But the protection range of this patent is not limited to concrete execution mode.
Embodiment 1
In Fig. 1, a kind of power supply alternating current-direct current input-switching circuit, peripheral main circuit is two-tube DC/DC change-over circuit, comprise: the positive voltage terminal of peripheral circuit input 220VAC after rectifier bridge V1 is connected to one end of resistance 1, the other end of resistance 1 is connected to one end of resistance 2, the other end of resistance 2 is connected to 1 pin of optocoupler 3, and 2 pin of optocoupler 3 connect the negative of the voltage after rectifier bridge V1.4 pin of optocoupler are just connecing peripheral circuit+12V accessory power supply, 3 pin of optocoupler 3 are connected to one end of resistance 4, one end of resistance 8, the other end of resistance 4 is connected to the B pole of triode 5, the C pole of triode 5 is connected to one end of resistance 6,2 pin of metal-oxide-semiconductor driving chip 10, the outside PWM1 drive singal of another termination of resistance 6, the other end of resistance 8 is connected to the B pole of triode 9, the C pole of triode 9 is connected to 4 pin of one end of resistance 7,10 of metal-oxide-semiconductor driving chip, the outside PWM2 signal of another termination of resistance 7, the E of two triodes is extremely all connected to+12VG.
When civil power input is normal, direct voltage after rectifier bridge V1, by 1 pin point being crimped onto optocoupler 3 of resistance 1, resistance 2, the elementary conducting of such optocoupler, optocoupler is normally worked, and then make triode 5, the B of triode 9 extremely all has voltage, such triode 5, triode 9 are just in conducting standby condition.Because outside PWM1, PWM2 signal is deposited always, two triodes are once conducting, and PWM1, PWM2 are just dragged down by two triodes.So just make metal-oxide-semiconductor driving chip 10 not input, so do not export, such DC/DC change-over circuit 2 does not have drive control signal, and therefore DC/DC change-over circuit 2 does not work, and DC/DC change-over circuit 1 normally works.At this moment be that civil power inputs as power supply.
When civil power power down, due to rectifier bridge defeated V1 rear end no-output direct voltage, 1 pin of such optocoupler 3 is without input, and then optocoupler is quit work, like this, the B pole no-voltage of triode 5, triode 9, triode 5, triode 9 do not work, thus outside PWM1, PWM2 signal cannot be dragged down, and then the metal-oxide-semiconductor driving chip 10 that makes have input, corresponding so just have PWM11, PWM21 two control signal, and such DC/DC change-over circuit 2 normally works, and is at this moment the input of DC input as power supply.
From above-mentioned analysis, as long as civil power exists, optocoupler 3 just has input, and then optocoupler normally works.Such triode 5, triode 9 conducting, make drive singal PWM1, PWM2 of not amplifying of DC/DC change-over circuit 2 by low and do not work.And then achieve the switching of alternating current-direct current input.
This circuit uses device few, simple and convenient, and handoff response speed is fast, and reliability is high, has a wide range of applications in alternating current-direct current input-switching circuit.
Claims (1)
1. a power supply alternating current-direct current input-switching circuit, be connected with the peripheral circuit for two-tube DC/DC change-over circuit, it is characterized in that: comprising: the positive voltage terminal of peripheral circuit input 220VAC after rectifier bridge V1 is connected to one end of resistance R1, the other end of resistance R1 is connected to one end of resistance R2, the other end of resistance R2 is connected to 1 pin of optocoupler 3, and 2 pin of optocoupler 3 connect the negative terminal of the voltage after rectifier bridge V1; 4 pin of optocoupler connect the anode of peripheral circuit+12V accessory power supply, 3 pin of optocoupler 3 are connected to one end of resistance R4, one end of resistance R8, the other end of resistance R4 is connected to the B pole of triode G5, the C pole of triode G5 is connected to one end of resistance R6,2 pin of metal-oxide-semiconductor driving chip 10, the outside PWM1 drive singal of another termination of resistance R6, the other end of resistance R8 is connected to the B pole of triode G9, the C pole of triode G9 is connected to one end of resistance R7,4 pin of metal-oxide-semiconductor driving chip 10, the outside PWM2 signal of another termination of resistance R7, the E of two triode G5, G9 is extremely all connected to+12VG.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571836.2U CN204167996U (en) | 2014-09-30 | 2014-09-30 | A kind of power supply alternating current-direct current input-switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571836.2U CN204167996U (en) | 2014-09-30 | 2014-09-30 | A kind of power supply alternating current-direct current input-switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204167996U true CN204167996U (en) | 2015-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420571836.2U Expired - Fee Related CN204167996U (en) | 2014-09-30 | 2014-09-30 | A kind of power supply alternating current-direct current input-switching circuit |
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| CN (1) | CN204167996U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467161A (en) * | 2014-09-30 | 2015-03-25 | 洛阳隆盛科技有限责任公司 | AC/DC input switching circuit and method for power source |
-
2014
- 2014-09-30 CN CN201420571836.2U patent/CN204167996U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467161A (en) * | 2014-09-30 | 2015-03-25 | 洛阳隆盛科技有限责任公司 | AC/DC input switching circuit and method for power source |
| CN104467161B (en) * | 2014-09-30 | 2017-12-01 | 洛阳隆盛科技有限责任公司 | A kind of power supply alternating current-direct current input-switching circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20190930 |