CN1110437A - High power transistor fast short-circuit protective circuit - Google Patents
High power transistor fast short-circuit protective circuit Download PDFInfo
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- CN1110437A CN1110437A CN 95101583 CN95101583A CN1110437A CN 1110437 A CN1110437 A CN 1110437A CN 95101583 CN95101583 CN 95101583 CN 95101583 A CN95101583 A CN 95101583A CN 1110437 A CN1110437 A CN 1110437A
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- gtr
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- power transistor
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Abstract
The present invention relates to a short-circuit protection circuit for high power transistor (GTR), consisting of four portions of detector, comparator, latch and phase inverter. The detector is used for detecting beam voltage Uce of GTR, and its output voltage is compared with the reference voltage of its comparator, if it is more than the reference voltage, and when it is short-circuited, it shows that the GTR operation is in unsaturated zone, and then the comparator delivers a high level, and then the high level triggers the latch to deliver a protection signal to make GTR turn-off. Said invention has the advantages of quick response (less than 10 microseconds), simple, reliable, easy to debug, low cost and strong anti-jamming capability.
Description
The present invention relates to a kind of high power transistor (hereinafter to be referred as GTR) short-circuit protection circuit, when external circuitry is short-circuited or makes GTR work enter non-saturated region owing to overload, GTR is turn-offed, so that GTR is protected.
GTR has application very widely in industrial production, as is used for AC converter, inverter etc., and its effect is extremely important, is one of parts most crucial in the equipment.GTR being exempted from damage is the main task of various protections, and this wherein threatens maximum short-circuit protection difficulty maximum to GTR.From using the situation of GTR at present both at home and abroad, do not find that as yet which family implements very effective short-circuit protection to GTR, do not retrieve the relevant patent documentation identical or close with the technology of the present invention content yet.Because China still can not produce GTR, industrial production is used will all depend on import, and price is very expensive, in a single day be short-circuited in the use, GTR is just burnt, except the direct economic loss of GTR, the economic loss that also influential production caused, unsafe factor and a large amount of maintenance works.
Purpose of the present invention is intended to propose a kind of protective circuit at problems of the prior art, and it can make GTR turn-off when being short-circuited rapidly, so that GTR is protected and is not burnt.
For achieving the above object, the protective circuit that the present invention proposes is made up of detector, comparator, latch and phase inverter 4 parts, and detector is pressed U to the collection radio of GTR
CBDetect; the reference voltage of its output voltage and comparator compares; if be higher than reference voltage; illustrate that GTR work enters non-saturated region, comparator is exported a high level, and this high level triggers latch; export a guard signal; after the phase inverter paraphase, send drive circuit, block drive signal, GTR is turn-offed.
Accompanying drawing is depicted as circuit block diagram of the present invention.
As shown in the figure, the protective circuit of the present invention's proposition is made up of detector, comparator, latch and phase inverter four parts.When GTR was short-circuited, the saturation region was withdrawed from the GTR operation, and collection radio is pressed U
CBRise rapidly, detector passes through U
CBOver-current signal is obtained in the detection of voltage, and detector has the distinguishing ability to the GTR running status, only during having drive signal, detect, do not have drive signal during detect shielding automatically.The output voltage of detector and the reference voltage of comparator compare, if be higher than reference voltage, illustrate that GTR overcurrent or short circuit take place, and comparator is exported a high level, and this high level triggers latch, exports a guard signal.Because in a single day latch is triggered, its state just has been lockable, so in case overcurrent takes place, and guard signal will appear at the output of latch, and this guard signal is sent into driver after paraphase always, block drive signal, GTR is turn-offed.
The GTR short-circuit protection circuit must have the response speed that is exceedingly fast.Under short-circuit conditions, the GTR device is bearing the impact of high voltage and big electric current simultaneously, and huge instantaneous power sharply rises junction temperature, if can not turn-off GTR fast, the GTR device will be burnt.So very important performance index of short-circuit protection circuit are its rapidities.Usually under rated voltage, the short circuit tolerance that do not repeat of GTR device is 50 microseconds.Duration of short circuit is shorter, and the short-circuit impact number of times that the GTR device can bear the more.If can be in 10 microseconds GTR be judged, then the GTR device short-circuit impact number of times that can bear can reach 1000 times.The short-circuit protection circuit response time that the present invention proposes is 2.5 microseconds, and its response speed has surpassed integrated circuit UAA4002.Because short-circuit protection circuit must have strong antijamming capability, is contradiction between the rapidity of response and the anti-interference, so protective circuit should be taken into account rapidity and anti-interference when actual height, makes both obtain best compromise.The present invention is transferred to 10 microseconds with the response time of 2.5 microseconds, and circuit just has very strong antijamming capability.Circuit of the present invention is simple, and debugging is convenient, and applied range is applicable to the protection of the GTR device of various darlington structures, and the selected components and parts price of circuit is very cheap.
Claims (1)
1, a kind of high power transistor fast short-circuit protective circuit is characterized in that: protective circuit is made up of detector, comparator, latch and phase inverter 4 parts, and detector is pressed U to the collection radio of high power transistor (GTR)
CEDetect; its output voltage and comparator reference voltage compare; if be higher than reference voltage; illustrate that GTR work enters non-saturated region, comparator is exported a high level, and this high level triggers latch; export a guard signal; after the phase inverter paraphase, send drive circuit, block drive signal, GTR is turn-offed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95101583 CN1110437A (en) | 1995-02-23 | 1995-02-23 | High power transistor fast short-circuit protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95101583 CN1110437A (en) | 1995-02-23 | 1995-02-23 | High power transistor fast short-circuit protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1110437A true CN1110437A (en) | 1995-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95101583 Pending CN1110437A (en) | 1995-02-23 | 1995-02-23 | High power transistor fast short-circuit protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110437A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723935A (en) * | 2012-05-22 | 2012-10-10 | 柏德胜 | Self-turnoff component driving protection circuit |
| CN104617543A (en) * | 2013-11-04 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Over-current protection circuit and lamp |
| CN107132466A (en) * | 2016-02-29 | 2017-09-05 | 英飞凌科技股份有限公司 | Method and device for the short-circuit detecting in power semiconductor switch |
| CN108075443A (en) * | 2016-11-14 | 2018-05-25 | 上海三菱电梯有限公司 | High speed transistor short-circuit protection circuit |
-
1995
- 1995-02-23 CN CN 95101583 patent/CN1110437A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723935A (en) * | 2012-05-22 | 2012-10-10 | 柏德胜 | Self-turnoff component driving protection circuit |
| CN104617543A (en) * | 2013-11-04 | 2015-05-13 | 深圳市海洋王照明工程有限公司 | Over-current protection circuit and lamp |
| CN104617543B (en) * | 2013-11-04 | 2018-11-27 | 深圳市海洋王照明工程有限公司 | A kind of current foldback circuit and lamps and lanterns |
| CN107132466A (en) * | 2016-02-29 | 2017-09-05 | 英飞凌科技股份有限公司 | Method and device for the short-circuit detecting in power semiconductor switch |
| CN107132466B (en) * | 2016-02-29 | 2020-06-16 | 英飞凌科技股份有限公司 | Method and device for short-circuit detection in power semiconductor switches |
| CN108075443A (en) * | 2016-11-14 | 2018-05-25 | 上海三菱电梯有限公司 | High speed transistor short-circuit protection circuit |
| CN108075443B (en) * | 2016-11-14 | 2020-01-03 | 上海三菱电梯有限公司 | Short-circuit protection circuit for high-speed transistor |
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| WD01 | Invention patent application deemed withdrawn after publication |