CN204517650U - A kind of high power switching power supply soft starting circuit - Google Patents
A kind of high power switching power supply soft starting circuit Download PDFInfo
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- CN204517650U CN204517650U CN201520167600.7U CN201520167600U CN204517650U CN 204517650 U CN204517650 U CN 204517650U CN 201520167600 U CN201520167600 U CN 201520167600U CN 204517650 U CN204517650 U CN 204517650U
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- resistance
- triode
- thyristor
- electric capacity
- effect transistor
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Abstract
The utility model discloses a kind of high power switching power supply soft starting circuit, comprise three-phase commutation bridge, field effect transistor, thyristor, diode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode, the first electric capacity, the second electric capacity, three-phase commutation bridge is connected with field effect transistor, thyristor, the second electric capacity respectively; Field effect transistor is connected with the second resistance, the first triode, diode, the 3rd resistance respectively; Diode is connected with the first triode and the second triode respectively; First triode is connected with the second triode; The two ends of the 4th resistance connect base stage and the emitter of the second triode respectively; 3rd resistance is connected with the second triode and thyristor respectively; The two ends of the first resistance connect anode and the negative electrode of thyristor respectively; The two ends of the first electric capacity connect gate pole and the negative electrode of thyristor respectively; The negative electrode of thyristor connects the positive pole of the second electric capacity.The utility model can be safe and reliable the start-up course realizing high power switching power supply.
Description
Technical field
The utility model relates to the technical field of power supply, refers in particular to a kind of high power switching power supply soft starting circuit.
Background technology
Soft starting circuit has very general application in high power switching power supply, high power switching power supply DC bus is generally all connected to Large Copacity storage capacitor, therefore input three-phase alternating-current supply can not directly be connected with DC bus through the output of three-phase commutation bridge, excessive surge current is produced during to avoid powering on, but through a resistance, thyristor parallel circuits is connected to DC bus, when powering on, by resistance the voltage of dc-link capacitance is charged to enough high after, trigger thyristor again, by this resistive short, thus realize switch power soft-start, to ensure that switch power module normally and reliably runs.The current-limiting circuit that the thyristor mostly adopting transformer to trigger in prior art matches with resistance, as shown in Figure 2, be made up of three-phase commutation bridge 01, thyristor 02, first resistance 03, second electric capacity 04, the 5th resistance 05, transformer 06, field effect transistor 07, the triggering signal of this circuit thyristor takes from the auxiliary winding of transformer, the triggering signal of thyristor is produced by the auxiliary winding of transformer, make turn on thyristors and short circuit current limitation resistance, realize switch power soft-start process.The soft starting circuit of this triggering mode is when three-phase alternating-current supply momentary power failure is connected again at once, voltage on second electric capacity 04 may decline to a great extent, but IGBT group signal still exists, at this moment this circuit does not have the effect preventing surge current, and now soft starting circuit lost efficacy.
Summary of the invention
The utility model, in order to solve the shortcoming that existing soft starting circuit may lose efficacy, reliability is low, proposes a kind of reliable and effective soft starting circuit that can be used for high power switching power supply, the start-up course realizing high power switching power supply that can be safe and reliable.
For achieving the above object, technical scheme provided by the utility model is: a kind of high power switching power supply soft starting circuit, it includes three-phase commutation bridge, field effect transistor, thyristor, diode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode, the first electric capacity, the second electric capacity, wherein, described field effect transistor is N channel-type, described first triode is positive-negative-positive, and described second triode is NPN type; The forward output of described three-phase commutation bridge is connected with the anode of thyristor with the drain electrode of field effect transistor respectively, and its negative sense output is connected with the negative pole of the second electric capacity; The drain electrode of described field effect transistor is connected with one end of the second resistance, and its grid is connected with the emitter of the first triode with the other end of the second resistance respectively, and its source electrode is connected with one end of the 3rd resistance with the anode of diode respectively; The negative electrode of described diode is connected with the base stage of the second triode with the collector electrode of the first triode respectively; The base stage of described first triode is connected with the collector electrode of the second triode; The two ends of described 4th resistance connect base stage and the emitter of the second triode respectively; The other end of described 3rd resistance is connected with the emitter of the second triode and the gate pole of thyristor respectively; The two ends of described first resistance are connected with negative electrode with the anode of thyristor respectively; The two ends of described first electric capacity are connected with the gate pole of thyristor and negative electrode respectively; The negative electrode of described thyristor is connected with the positive pole of the second electric capacity.
It is also supporting has three-phase voltage source to be power supply.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
Soft starting circuit of the present utility model the voltage of dc-link capacitance charge to enough high after, trigger thyristor again, and by soft start resistive short, thus realize the reliable and secure soft start of high power switching power supply, the circuits for triggering of this soft starting circuit are more effectively reliable, and do not need to draw triggering signal from late-class circuit transformer, there is more general applicability.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of high power switching power supply soft starting circuit described in the utility model.
Fig. 2 is a kind of soft starting circuit figure of prior art.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
As shown in Figure 1, high power switching power supply soft starting circuit described in the present embodiment, include three-phase commutation bridge 1, field effect transistor 8, thyristor 2, diode 13, first resistance 3, second resistance 9, the 3rd resistance 12, the 4th resistance 14, first triode 10, second triode 11, first electric capacity 15, second electric capacity 4 and supportingly have three-phase voltage source to be power supply, wherein, described field effect transistor 8 is N channel-type, described first triode 10 is positive-negative-positive, and described second triode 11 is NPN type; The forward output of described three-phase commutation bridge 1 is connected with the anode of thyristor 2 with the drain electrode of field effect transistor 8 respectively; The negative sense output of described three-phase commutation bridge 1 is connected with the negative pole of the second electric capacity 4; The drain electrode of described field effect transistor 8 is connected with one end of the second resistance 9, and its grid is connected with the other end of the second resistance 9 and the emitter of the first triode 10 respectively; The source electrode of described field effect transistor 8 is connected with the anode of diode 13 and one end of the 3rd resistance 12 respectively; The negative electrode of described diode 13 is connected with the collector electrode of the first triode 10, the base stage of the second triode 11 respectively; The base stage of described first triode 10 is connected with the collector electrode of the second triode 11; The two ends of described 4th resistance 14 connect base stage and the emitter of the second triode 11 respectively; The other end of described 3rd resistance 12 is connected with the emitter of the second triode 11 and the gate pole of thyristor 2 respectively; The two ends of described first resistance 3 are connected with negative electrode with the anode of thyristor 2 respectively; The two ends of described first electric capacity 15 are connected with the gate pole of thyristor 2 and negative electrode respectively; The negative electrode of described thyristor 2 is connected with the positive pole of the second electric capacity 4.
Be below the operation principle of the above-mentioned high power switching power supply soft starting circuit of the present embodiment, its concrete condition is as follows:
From A, B, C three-phase alternating-current supply is connected in a period of time of beginning, second electric capacity 4 accepts the charging current of the first resistance 3, its both end voltage starts to rise from zero, before the second electric capacity 4 both end voltage is close to three-phase commutation bridge 1 output voltage, namely when the first resistance 3 both end voltage is higher, if field effect transistor 8 is conductings, then its On current is larger, the pressure drop that this electric current produces on the 3rd resistance 12 is also larger, when this pressure drop is greater than the emitter junction forward conduction voltage sum of diode 13 and the second triode 11, second triode 11 conducting, cause the first triode 10 also conducting, collector electrode due to the first triode 10 connects the base stage of the second triode 11, the collector electrode of the second triode 11 connects the base stage of the first triode 10, therefore first, two triodes form positive feedback structure, thus cause first, the rapid saturation conduction of two triodes, as long as and the 4th resistance 14 both end voltage is not less than the emitter junction conducting voltage of the second triode 11, first, two triodes will maintain saturation conduction state, field effect transistor 8 is turned off lower than turn-on threshold voltage because of its gate source voltage, the said process time is very short, as long as the first electric capacity 15 capacity is enough large, then its both end voltage is just enough little, make thyristor 2 gate current also enough little, thus thyristor 2 can not be triggered, after this gate current of thyristor 2 is determined primarily of the second resistance 9, as long as the second resistance 9 is enough large, make gate current enough little, thyristor 2 still can maintain cut-off state, increase with the charging interval when the first resistance 3 both end voltage and drop to enough hour, namely the second electric capacity 4 both end voltage is close to three-phase commutation bridge 1 output voltage, namely when the voltage on the 4th resistance 14 decreases to and is less than the second triode 11 emitter junction conducting voltage, second triode 11 ends, first triode 10 also ends thereupon, rectifier bridge 1 output current gives the junction capacitance charging of field effect transistor 8 grid source through the second resistance 9, until field effect transistor 8 conducting, because now the first resistance 3 both end voltage is lower, field effect transistor 8 On current can not be excessive, make pressure drop on the 3rd resistance 12 unlikely too high and cause the second triode 11 conducting then finally to cause field effect transistor 8 to be ended, therefore field effect transistor 8 electric conduction fails to be convened for lack of a quorum, to continue to charge to voltage to the first electric capacity 15 enough high, make thyristor 2 gate current enough large and trigger thyristor 2, thus by the first resistance 3 short circuit, realize switch power soft-start, thyristor 2 is triggered when dropping to much as the first resistance 3 both end voltage difference of voltage (namely on rectifier bridge 1 output voltage and the second electric capacity 4), resistance primarily of the second resistance 9 and the 4th resistance 14 determines (gate circuit transistor gate, cloudy electrode resistance is very little, general several ohm to tens of Ohms, can ignore, the pressure drop of triode saturation conduction also can be ignored), if the resistance of the second resistance 9 and the 4th resistance 14 is respectively R9, R14, the first resistance both end voltage during IGBT group is VR3, triode emission knot conducting voltage is 0.7 volt, then there is VR3=0.7 × (R14+R9)/R14, unit is volt, such as, if R14=1k is Ω, R9=29k Ω, then VR3=21 volt, namely after powering on, when voltage drop on the first resistance 3 is to about 21 volts, thyristor 2 can be triggered.
The examples of implementation of the above are only the preferred embodiment of the utility model, not limit practical range of the present utility model with this, therefore the change that all shapes according to the utility model, principle are done, all should be encompassed in protection range of the present utility model.
Claims (2)
1. a high power switching power supply soft starting circuit, it is characterized in that: it includes three-phase commutation bridge, field effect transistor, thyristor, diode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode, the first electric capacity, the second electric capacity, wherein, described field effect transistor is N channel-type, described first triode is positive-negative-positive, and described second triode is NPN type; The forward output of described three-phase commutation bridge is connected with the anode of thyristor with the drain electrode of field effect transistor respectively, and its negative sense output is connected with the negative pole of the second electric capacity; The drain electrode of described field effect transistor is connected with one end of the second resistance, and its grid is connected with the emitter of the first triode with the other end of the second resistance respectively, and its source electrode is connected with one end of the 3rd resistance with the anode of diode respectively; The negative electrode of described diode is connected with the base stage of the second triode with the collector electrode of the first triode respectively; The base stage of described first triode is connected with the collector electrode of the second triode; The two ends of described 4th resistance connect base stage and the emitter of the second triode respectively; The other end of described 3rd resistance is connected with the emitter of the second triode and the gate pole of thyristor respectively; The two ends of described first resistance are connected with negative electrode with the anode of thyristor respectively; The two ends of described first electric capacity are connected with the gate pole of thyristor and negative electrode respectively; The negative electrode of described thyristor is connected with the positive pole of the second electric capacity.
2. a kind of high power switching power supply soft starting circuit according to claim 1, is characterized in that: it is also supporting has three-phase voltage source to be power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520167600.7U CN204517650U (en) | 2015-03-24 | 2015-03-24 | A kind of high power switching power supply soft starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520167600.7U CN204517650U (en) | 2015-03-24 | 2015-03-24 | A kind of high power switching power supply soft starting circuit |
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| CN204517650U true CN204517650U (en) | 2015-07-29 |
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| CN201520167600.7U Withdrawn - After Issue CN204517650U (en) | 2015-03-24 | 2015-03-24 | A kind of high power switching power supply soft starting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753329A (en) * | 2015-03-24 | 2015-07-01 | 华南理工大学 | High-power switch power source soft starting circuit |
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2015
- 2015-03-24 CN CN201520167600.7U patent/CN204517650U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753329A (en) * | 2015-03-24 | 2015-07-01 | 华南理工大学 | High-power switch power source soft starting circuit |
| CN104753329B (en) * | 2015-03-24 | 2017-04-05 | 华南理工大学 | A kind of high power switching power supply soft starting circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160628 Address after: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District City Road No. 42 building 4 floor Yongda group Patentee after: Guangzhou Yu Yu welding equipment Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: South China University of Technology |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150729 Effective date of abandoning: 20170405 |