CN202903964U - Thyristor breakdown detection circuit - Google Patents
Thyristor breakdown detection circuit Download PDFInfo
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- CN202903964U CN202903964U CN 201220663565 CN201220663565U CN202903964U CN 202903964 U CN202903964 U CN 202903964U CN 201220663565 CN201220663565 CN 201220663565 CN 201220663565 U CN201220663565 U CN 201220663565U CN 202903964 U CN202903964 U CN 202903964U
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Abstract
The utility model provides a thyristor breakdown detection circuit, comprising a photocoupling circuit and a trigger circuit. A sampling signal input terminal of the photocoupling circuit is connected with a voltage signal output terminal of a thyristor to be detected. A switching value signal output terminal of the photocoupling circuit is connected with a switching value signal input terminal of the trigger circuit. A trigger signal output terminal of the trigger circuit is connected with a trigger signal input terminal of the thyristor to be detected. According to the utility model, voltage between an anode and a cathode of the thyristor is sampled; the voltage between the anode and the cathode is close to zero volt and a high-level switching value signal is output by the circuit when the thyristor is broken down, while a low-level switching value signal is output when the thyristor is not broken down; and when receiving the low-level switching value signal, a thyristor trigger device outputs a trigger signal to enable the thyristor to be in conduction, while when receiving the high-level switching value signal, the thyristor trigger device does not output the trigger signal, thereby preventing the breakdown of the thyristor from causing human and equipment security incidents.
Description
Technical field
The utility model relates to a kind of thyristor and punctures testing circuit, belongs to the electric machines control technology field.
Background technology
At present, domestic motor commutation control system as noncontacting switch, replaces mechanical switch control with thyristor, and control system adopts electrical interlocks, and the commutation operation of control motor can be avoided phase fault in thyristor rectifier situation working properly.
Because thyristor is a kind of controlled semiconductor switches element, the failure conditions such as puncture, open circuit in use appear unavoidably.And after thyristor lost efficacy, can affect the normal operation of equipment, even can cause the catastrophic failure such as phase fault, jeopardize equipment and personal safety.And present thyristor testing circuit only carries out Fault Identification and can't be to the thyristor control circuit feedback signal, can't support equipment and personal safety.
Summary of the invention
The utility model can't be to the problem of thyristor control circuit feedback signal for the Fault Identification of only carrying out that solves that existing thyristor detection technique exists, and then provides a kind of thyristor to puncture testing circuit.For this reason, the utility model proposes following technical scheme:
Thyristor punctures testing circuit, comprise photoelectric coupling circuit and trigger circuit, the sampled signal input end of described photoelectric coupling circuit is connected with the voltage signal output end of thyristor to be measured, the amount of the opening the light signal output part of described photoelectric coupling circuit is connected with the switching value signal input part of described trigger circuit, and the trigger pip output terminal of described trigger circuit is connected with the trigger pip input end of described tested thyristor.
The utility model is by sampling to the anode of thyristor and the voltage between the negative electrode, and export a switching value signal, voltage when thyristor punctures between its anode and the negative electrode is near the zero volt spy, circuit output high level switching value signal, output low level switching value signal then when thyristor does not puncture, thyristor triggering device is received low level switching value signal, and the output trigger pip makes the thyristor conducting; Thyristor triggering device is received high level switching value signal, does not then export trigger pip, avoids causing the person and device security accident because thyristor punctures.
Description of drawings
The thyristor that Fig. 1 provides for embodiment of the present utility model punctures the structural representation of testing circuit;
Fig. 2 is the structural representation of existing thyristor state detection circuit;
The thyristor that Fig. 3 provides for embodiment one of the present utility model punctures the electrical block diagram of testing circuit;
The thyristor that Fig. 4 provides for embodiment two of the present utility model punctures the electrical block diagram of testing circuit.
Embodiment
The below is described in further detail the utility model: present embodiment is implemented under take technical solutions of the utility model as prerequisite, has provided detailed embodiment, but protection domain of the present utility model is not limited to following embodiment.
This embodiment provides a kind of thyristor to puncture testing circuit, as shown in Figure 1, comprise photoelectric coupling circuit and trigger circuit, the sampled signal input end of described photoelectric coupling circuit is connected with the voltage signal output end of thyristor to be measured, the amount of the opening the light signal output part of described photoelectric coupling circuit is connected with the switching value signal input part of described trigger circuit, and the trigger pip output terminal of described trigger circuit is connected with the trigger pip input end of described tested thyristor.
Existing thyristor state detection circuit mainly is made of power circuit, trigger circuit and testing result indication as shown in Figure 2.Power circuit wherein provides forward voltage for thyristor to be detected, and trigger circuit provide trigger pip for thyristor to be detected, and whether testing result indicating circuit identification thyristor lost efficacy and failure mode.The principle of work that the thyristor that this embodiment provides punctures testing circuit is: sample circuit is sampled to the voltage between thyristor anode and negative electrode, the control end of sampled signal input photoelectric isolating circuit, when the sampled signal of input is high level, the switching value signal controlling thyristor gating circuit output trigger pip of photoelectric isolating circuit output, when the sampled signal of input was low level, the switching value signal controlling thyristor gating circuit of photoelectric isolating circuit output cut off trigger pip.
The course of work of the thyristor state detection circuit that this embodiment is provided below in conjunction with specific embodiment specifies.
Embodiment one
As shown in Figure 3, if thyristor is not in the situation of conducting, sampling end AC1, AC2 are thyristor two ends ac high voltage (both end voltage is only for for the tube voltage drop during with respect to the thyristor conducting), both end voltage is not pulsating direct current by the DQ1 rectification when thyristor has conducting, make photoelectrical coupler U1 conducting, its output terminal (OUT end) is got is the low level (be the direct current of pulsation because of the photoelectrical coupler input end) of pulsation, then utilize the Programmable Logic Device of rear end or mimic channel etc. filtering, judge the silicon controlled state.If at this moment controllable silicon should be the state of conducting, what detect but is that the low level signal of pulsing just can judge that controllable silicon is the distress condition of open circuit.
If in the situation of thyristor conducting, so only can not support that for tube voltage drop what get is high level for its output terminal of conducting (OUT end) of photoelectrical coupler input end so sampling end AC1, AC2 are the thyristor both end voltage, then utilize filtering, the judgement silicon controlled state of the Programmable Logic Device of rear end or mimic channel etc.If at this moment controllable silicon should be the state of cut-off, what detect but is that high level signal just can judge that controllable silicon is the distress condition that punctures.
Embodiment two
As shown in Figure 4, thyristor state detection circuit principle of work in the present embodiment is identical with the thyristor state detection circuit among the embodiment one, just utilize the facility of photoelectrical coupler input end two-way admittance, saved the rectifier bridge DQ1 among Fig. 3, make circuit more succinct.
The technical scheme that adopts this embodiment to provide, by the anode of thyristor and the voltage between the negative electrode are sampled, and export a switching value signal, voltage when thyristor punctures between its anode and the negative electrode is near the zero volt spy, circuit output high level switching value signal, output low level switching value signal then when thyristor does not puncture, thyristor triggering device is received low level switching value signal, the output trigger pip makes the thyristor conducting; Thyristor triggering device is received high level switching value signal, does not then export trigger pip, avoids causing the person and device security accident because thyristor punctures.
The above; it only is the better embodiment of the utility model; these embodiments all are based on the different implementations under the utility model general idea; and protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (1)
1. thyristor punctures testing circuit, it is characterized in that, comprise photoelectric coupling circuit and trigger circuit, the sampled signal input end of described photoelectric coupling circuit is connected with the voltage signal output end of thyristor to be measured, the amount of the opening the light signal output part of described photoelectric coupling circuit is connected with the switching value signal input part of described trigger circuit, and the trigger pip output terminal of described trigger circuit is connected with the trigger pip input end of described tested thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220663565 CN202903964U (en) | 2012-12-05 | 2012-12-05 | Thyristor breakdown detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220663565 CN202903964U (en) | 2012-12-05 | 2012-12-05 | Thyristor breakdown detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903964U true CN202903964U (en) | 2013-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220663565 Expired - Fee Related CN202903964U (en) | 2012-12-05 | 2012-12-05 | Thyristor breakdown detection circuit |
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| CN (1) | CN202903964U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018653A (en) * | 2012-12-05 | 2013-04-03 | 齐齐哈尔齐力达电子有限公司 | Thyristor breakdown detecting circuit |
| CN105911313A (en) * | 2016-04-26 | 2016-08-31 | 国网河南省电力公司商丘供电公司 | Electric isolation switch terminal bar test sensor |
| CN106992499A (en) * | 2016-03-22 | 2017-07-28 | 上海兆力电器制造有限公司 | Controllable silicon for intermediate frequency furnace detects protection device and intermediate frequency furnace |
| CN116794554A (en) * | 2023-06-21 | 2023-09-22 | 科大智能（合肥）科技有限公司 | Output short circuit detection circuit of three-phase alternating current power supply charging pile |
-
2012
- 2012-12-05 CN CN 201220663565 patent/CN202903964U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018653A (en) * | 2012-12-05 | 2013-04-03 | 齐齐哈尔齐力达电子有限公司 | Thyristor breakdown detecting circuit |
| CN106992499A (en) * | 2016-03-22 | 2017-07-28 | 上海兆力电器制造有限公司 | Controllable silicon for intermediate frequency furnace detects protection device and intermediate frequency furnace |
| CN106992499B (en) * | 2016-03-22 | 2019-07-26 | 上海兆力电器制造有限公司 | Silicon-controlled detection protective device and intermediate frequency furnace for intermediate frequency furnace |
| CN105911313A (en) * | 2016-04-26 | 2016-08-31 | 国网河南省电力公司商丘供电公司 | Electric isolation switch terminal bar test sensor |
| CN116794554A (en) * | 2023-06-21 | 2023-09-22 | 科大智能（合肥）科技有限公司 | Output short circuit detection circuit of three-phase alternating current power supply charging pile |
| CN116794554B (en) * | 2023-06-21 | 2024-03-08 | 科大智能（合肥）科技有限公司 | Output short circuit detection circuit of three-phase alternating current power supply charging pile |
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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: 20130424 Termination date: 20171205 |