CN203056956U - Soft start circuit of switch power source - Google Patents
Soft start circuit of switch power source Download PDFInfo
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- CN203056956U CN203056956U CN 201220723634 CN201220723634U CN203056956U CN 203056956 U CN203056956 U CN 203056956U CN 201220723634 CN201220723634 CN 201220723634 CN 201220723634 U CN201220723634 U CN 201220723634U CN 203056956 U CN203056956 U CN 203056956U
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Abstract
The utility model provides a soft start circuit of a switch power source and belongs to the technical field of power electronics. The utility model solves problems that the number of welding spots is large, faults are easy to cause and the maintenance is inconvenient in the prior art. The soft start circuit of the switch power source includes a full-bridge rectification circuit connected with a power source, a power input circuit and a switch circuit. The power input circuit is connected with the switch circuit. An input terminal of the full-bridge rectification circuit is connected with a thermistor Rt. An output terminal of the full-bridge rectification circuit is an output terminal of the soft start circuit of the switch power source. The soft start circuit of the switch power source also includes a relay. A coil of the relay is connected with the switch circuit. A normally-open switch K of the relay is connected with the thermistor Rt in parallel. According to the utility model, the number of the welding points of the soft start circuit of the switch power source can be reduced, the reliability of the soft start circuit of the switch power source is improved, and convenience is made for maintaining and troubleshooting. At the same time, the manufacturing cost is reduced.
Description
Technical field
The utility model belongs to electric and electronic technical field, relates to a kind of Switching Power Supply soft starting circuit.
Background technology
High speed development along with power electronic technology, the relation of power electronic equipment and people's work, life is close day by day, and electronic equipment all be unable to do without reliable power supply, the Switching Power Supplyization that entered the computer power supply round Realization eighties, take the lead in finishing the power supply replacement of computer, enter nineties Switching Power Supply and enter various electronics, electric equipment field in succession, stored-program control exchange, communication, electron detection device power supply, control appliance power supply etc. have all used Switching Power Supply widely, have more promoted developing rapidly of switch power technology.Switching Power Supply is compared with linear power supply, and the cost of the two all increases along with the increase of power output, but the two rate of rise is different.The linear power supply cost is higher than Switching Power Supply on the contrary on a certain power output point.Along with development and the innovation of power electronic technology, make switch power technology in innovation constantly, this cost rollback point moves to low output power end day by day, and this provides development space widely for Switching Power Supply.
Existing Switching Power Supply soft starting circuit often connects a plurality of thermistors and a piezo-resistance connects to realize soft startup protection at input; but a plurality of thermistors and a piezo-resistance series connection make that the pad on the welded plate is more; circuit connects more complicated; because the immediate current of starting circuit is bigger; more pad exists failure rate higher; problems such as the maintenance troubleshooting more bothers, and production cost is higher.
Summary of the invention
There are the problems referred to above in the utility model at existing technology, has proposed a kind of Switching Power Supply soft starting circuit, and this Switching Power Supply soft starting circuit can reduce the pad of circuit, has improved the reliability of circuit, is convenient to keep in repair troubleshooting, has reduced manufacturing cost simultaneously.
The utility model is realized by following technical proposal: a kind of Switching Power Supply soft starting circuit, comprise the full bridge rectifier that is connected with power supply, power supply input circuit and switching circuit, described power supply input circuit is connected with switching circuit, it is characterized in that, the input of described full bridge rectifier is connected with a thermistor Rt, the output of full bridge rectifier is the output of this circuit, this Switching Power Supply soft starting circuit also comprises a relay, the coil of described relay is connected with switching circuit, and normal open switch K and the thermistor Rt of described relay are connected in parallel.
Because the immediate current of starting is bigger; thermistor Rt is set can effectively be protected circuit; connect power supply; ac signal input power supply input circuit and full bridge rectifier; electric current is exported to switching circuit after power supply input circuit is handled; after starting is finished; voltage enters stable state; circuit no longer needs the protection of thermistor Rt; in order to improve the useful life of thermistor Rt, switching circuit engage relay coil gets electric, and relay coil gets the normal open switch K adhesive of electrical relay; the adhesive of relay normally open K switch is with the thermistor short circuit, and the alternating-current power supply signal directly inserts full bridge rectifier output power supply.
In above-mentioned Switching Power Supply soft starting circuit, described power supply input circuit is connected by optocoupler with switching circuit.The optocoupler connection reliability is better.
In above-mentioned Switching Power Supply soft starting circuit, described power supply input circuit comprises anodal voltage stabilizing didoe W and diode D1, piezo-resistance Rv and the resistance R 1 that is connected with power supply, the negative pole of described voltage stabilizing didoe W is connected with piezo-resistance Rv one end, the other end of described piezo-resistance Rv is connected with an end of optocoupler input, described diode D1 negative pole is connected with resistance R 1 one ends, and the other end of described resistance R 1 is connected with the other end of optocoupler input.Voltage stabilizing didoe W and diode D1 are made into dc signal with the ac signal of input; voltage stabilizing didoe W can improve the stability of output voltage; resistance R 1 is used for step-down; the resistance of resistance R 1 can be selected according to the circuit actual needs, and piezo-resistance Rv is used for the power supply input circuit overvoltage protection.
In above-mentioned Switching Power Supply soft starting circuit, described switching circuit comprises resistance R 2 and field effect transistor Q, one end of described optocoupler output is connected with an end of resistance R 2, the other end of described resistance R 2 is connected with relay coil one end, the other end of described relay coil is connected with the source electrode of field effect transistor Q, the grid of described field effect transistor Q and resistance R 2 are connected on the same end of optocoupler output, and the drain electrode of described field effect transistor Q is connected with the other end of optocoupler output.When starting is finished, field effect transistor Q conducting, thereby engage relay coil make the adhesive of relay normally open K switch, and whether field effect transistor Q is used for control engage relay coil.
In above-mentioned Switching Power Supply soft starting circuit, as preferably, be parallel with diode D2 on the described relay coil, the positive pole of described diode D2 is connected with the source electrode of field effect transistor Q, and the negative pole of described diode D2 is connected on relay coil and this end that resistance R 2 is connected.Diode D2 plays the current-limiting protection effect.
Compared with prior art, this Switching Power Supply soft starting circuit has the following advantages: 1, a thermistor is replaced a plurality of thermistors and a piezo-resistance, reduces the solder joint on the welded plate, has improved the reliability of circuit, be convenient to keep in repair troubleshooting, reduced manufacturing cost; 2, connect by optocoupler, improve reliability; 3, set up diode, play metering function, improve circuit stability.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Among the figure, 1, full bridge rectifier; 2, power supply input circuit; 3, switching circuit; 4, relay coil; 5, optocoupler.
Embodiment
Below be specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
As shown in Figure 1, a kind of Switching Power Supply soft starting circuit, comprise power supply, full bridge rectifier 1, power supply input circuit 2, switching circuit 3, relay and thermistor Rt, power supply and power supply input circuit 2 are connected to power supply input circuit 2 power supplies, input circuit is connected by optocoupler 5 with switching circuit 3, power supply also with thermistor Rt one end, the other end of thermistor Rt is connected on the input of full bridge rectifier 1, the output of full bridge rectifier 1 is the output of this circuit, switching circuit 3 is connected with the coil of relay, and normal open switch K and the thermistor Rt of relay are connected in parallel.
Power supply input circuit 2 comprises voltage stabilizing didoe W and diode D1; piezo-resistance Rv and resistance R 1; the positive pole of voltage stabilizing didoe W and diode D1 is connected with two inputs of power supply respectively; the negative pole of voltage stabilizing didoe W is connected with piezo-resistance Rv one end; the other end of piezo-resistance Rv is connected with an end of optocoupler 5 inputs; diode D1 negative pole is connected with resistance R 1 one ends; the other end of resistance R 1 is connected with the other end of optocoupler 5 inputs; switching circuit 3 comprises resistance R 2; field effect transistor Q and diode D2; one end of optocoupler 5 outputs is connected with an end of resistance R 2; the other end of resistance R 2 is connected with relay coil 4 one ends; the other end of relay coil 4 is connected with the source electrode of field effect transistor Q; the grid of field effect transistor Q and resistance R 2 are connected on the same end of optocoupler 5 outputs; the drain electrode of field effect transistor Q is connected with the other end of optocoupler 5 outputs; be parallel with diode D2 on the relay coil 4; the positive pole of diode D2 is connected with the source electrode of field effect transistor Q; the negative pole of diode D2 and relay coil 4 are connected on resistance R 2 and this end that relay coil 4 is connected; voltage stabilizing didoe W can improve the stability of output voltage; resistance R 1 is used for step-down; the resistance of resistance R 1 can be selected according to the circuit actual needs; piezo-resistance Rv is used for power supply input circuit 2 overvoltage protections; diode D2 can play the current-limiting protection effect; behind thermistor Rt short circuit; power supply directly is full bridge rectifier 1 power supply, full bridge rectifier 1 output galvanic current signal.As another kind of scheme, switching circuit 3 comprises switch and relay coil 4, and switch, relay coil 4 and power supply are connected to form the loop, after starting is finished, the hand control switch adhesive, relay coil 4, with thermistor Rt short circuit, thereby be equal to the effect of switching circuit 3.
The operation principle of this Switching Power Supply soft starting circuit is as follows: because the immediate current of starting is bigger, thermistor Rt is set can effectively be protected circuit, connect power supply, ac signal input power supply input circuit 2, voltage stabilizing didoe W in the signal of telecommunication input circuit and diode D1, voltage stabilizing didoe W and diode D1 are rectified into dc signal with ac signal, the direct current that 1 pair of rectification of resistance R goes out carries out step-down to be handled, export to switching circuit 3 by optocoupler 5, piezo-resistance Rv can be to the components and parts overvoltage protection in the power supply input circuit 2, the full bridge rectifier 1 of power supply input simultaneously, full bridge rectifier 1 overvoltage protection of thermistor Rt; After starting is finished; the instantaneous large-current of starting no longer exists; the power supply signal of output is in stable state; field effect transistor Q conducting in the switching circuit 3; make relay coil 4 get; the normal open switch K adhesive that relay coil 4 gets electrical relay; the adhesive of relay normally open K switch is with thermistor Rt short circuit; this moment, this circuit no longer needed the protection of thermistor Rt; for useful life of improving thermistor Rt with its short circuit; power supply directly gives full bridge rectifier 1 power supply, the exportable galvanic current signal of this circuit.This circuit is replaced a plurality of thermistors and a piezo-resistance by a thermistor, reduces the solder joint on the welded plate, has improved the reliability of circuit, is convenient to keep in repair troubleshooting, has reduced manufacturing cost.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as full bridge rectifier 1, power supply input circuit 2, switching circuit 3, relay coil 4, optocoupler 5 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (5)
1. Switching Power Supply soft starting circuit, comprise the full bridge rectifier, power supply input circuit (2) and the switching circuit (3) that are connected with power supply, described power supply input circuit (2) is connected with switching circuit (3), it is characterized in that, the input of described full bridge rectifier is connected with a thermistor Rt, the output of full bridge rectifier is the output of this circuit, this Switching Power Supply soft starting circuit also comprises a relay, the coil of described relay is connected with switching circuit (3), and normal open switch K and the thermistor Rt of described relay are connected in parallel.
2. Switching Power Supply soft starting circuit according to claim 1 is characterized in that, described power supply input circuit (2) is connected by optocoupler (5) with switching circuit (3).
3. Switching Power Supply soft starting circuit according to claim 1, it is characterized in that, described power supply input circuit (2) comprises anodal voltage stabilizing didoe W and diode D1, piezo-resistance Rv and the resistance R 1 that is connected with power supply, the negative pole of described voltage stabilizing didoe W is connected with piezo-resistance Rv one end, the other end of described piezo-resistance Rv is connected with an end of optocoupler (5) input, described diode D1 negative pole is connected with resistance R 1 one ends, and the other end of described resistance R 1 is connected with the other end of optocoupler (5) input.
4. Switching Power Supply soft starting circuit according to claim 3, it is characterized in that, described switching circuit (3) comprises resistance R 2 and field effect transistor Q, one end of described optocoupler (5) output is connected with an end of resistance R 2, the other end of described resistance R 2 is connected with relay coil (4) one ends, the other end of described relay coil (4) is connected with the source electrode of field effect transistor Q, the grid of described field effect transistor Q and resistance R 2 are connected on the same end of optocoupler (5) output, and the drain electrode of described field effect transistor Q is connected with the other end of optocoupler (5) output.
5. according to claim 1 or 2 or 3 or 4 described Switching Power Supply soft starting circuits, it is characterized in that, described relay coil is parallel with diode D2 on (4), the positive pole of described diode D2 is connected with the source electrode of field effect transistor Q, and the negative pole of described diode D2 is connected on relay coil (4) and this end that resistance R 2 is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220723634 CN203056956U (en) | 2012-12-24 | 2012-12-24 | Soft start circuit of switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220723634 CN203056956U (en) | 2012-12-24 | 2012-12-24 | Soft start circuit of switch power source |
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|---|---|
| CN203056956U true CN203056956U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220723634 Expired - Fee Related CN203056956U (en) | 2012-12-24 | 2012-12-24 | Soft start circuit of switch power source |
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| CN (1) | CN203056956U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753327A (en) * | 2013-12-30 | 2015-07-01 | 鸿富锦精密工业(武汉)有限公司 | Switching power supply |
| CN106505836A (en) * | 2016-12-16 | 2017-03-15 | 张家港华捷电子有限公司 | A kind of low power consumption switch supply unit |
| CN108347161A (en) * | 2017-01-25 | 2018-07-31 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft starting circuit and frequency converter comprising it |
-
2012
- 2012-12-24 CN CN 201220723634 patent/CN203056956U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753327A (en) * | 2013-12-30 | 2015-07-01 | 鸿富锦精密工业(武汉)有限公司 | Switching power supply |
| CN104753327B (en) * | 2013-12-30 | 2017-09-19 | 鸿富锦精密工业(武汉)有限公司 | Switching Power Supply |
| CN106505836A (en) * | 2016-12-16 | 2017-03-15 | 张家港华捷电子有限公司 | A kind of low power consumption switch supply unit |
| CN108347161A (en) * | 2017-01-25 | 2018-07-31 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft starting circuit and frequency converter comprising it |
| CN108347161B (en) * | 2017-01-25 | 2021-11-23 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter soft start circuit and frequency converter comprising same |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20211224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |