CN104868457A - IGBT overvoltage protective circuit capable of large-power energy discharge - Google Patents
IGBT overvoltage protective circuit capable of large-power energy discharge Download PDFInfo
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- CN104868457A CN104868457A CN201410813217.4A CN201410813217A CN104868457A CN 104868457 A CN104868457 A CN 104868457A CN 201410813217 A CN201410813217 A CN 201410813217A CN 104868457 A CN104868457 A CN 104868457A
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Abstract
The invention relates to an IGBT overvoltage protective circuit capable of large-power energy discharge, belongs to the technical field of speed regulation of motors, and mainly aims at solving the problem that a present overvoltage protective circuit incapable of discharging energy completely causes voltage rise and further burns an IGBT. The IGBT overvoltage protective circuit is mainly characterized by comprising a voltage monitoring circuit, a discharge circuit and a silicon controlled rectifier trigger circuit; the voltage monitoring circuit is composed of a current-limiting resistor, an anti-reverse diode, a breakdown diode, a third resistor and a second resistor, the current-limiting resistor, the anti-reverse diode, the breakdown diode and the third resistor are connected in series, and the second resistor is connected with the breakdown diode in parallel; the discharge circuit is composed of a silicon controlled rectifier, and is connected with the voltage monitoring circuit in parallel; and the silicon controlled rectifier trigger circuit is composed of a Zener diode, a second diode and a third diode connected in series, the silicon controlled rectifier trigger circuit is connected onto two ends of the third resistor in parallel, and the cathodes of the second diode and the third diode are connected with the control electrode of the silicon controlled rectifier. The IGBT overvoltage protective circuit can detect overvoltage rapidly, an energy discharge channel is provided once a protection threshold is reached, the IGBT is avoided from burning loss, and the IGBT overvoltage protective circuit is mainly applied to overvoltage protection for an IGBT module in a rotor frequency-conversion speed regulation system.
Description
Technical field
The invention belongs to electric machine speed regulation technical field, relate to power device protective circuit, particularly a kind of IGBT overvoltage crowbar.
Background technology
Rotor frequency conversion speed-adjusting system is by presenting winding by motor slip power feedback grid or motor, reach the object regulating motor speed, because its needs control motor slip power, compare the capacity of power of motor needed for it greatly to reduce, so be a kind of governing system efficiently, be widely used in asquare torque load fields such as blower fan water pumps, achieve good energy-saving effect.In known technology, existing rotor frequency conversion speed-adjusting system mainly adopts three-phase bridge rectifier circuit that rotor windings output potential is rectified into direct current, then the copped wave booster circuit through IGBT, inductance, diode and voltage composition raises direct voltage, then presents winding in the three-phase inverting circuit inversion telegram in reply net that is made up of controllable silicon or IGBT or motor.After electrical network flickering, power failure or other reason cause inversion circuit fault, the energy gathered in DC loop cannot feedback grid or presented winding consumption in motor, and the electromagnetic energy in rotor winding also continues through rectification circuit flows to DC loop, cause DC loop voltage to raise, cause IGBT overvoltage scaling loss.Traditional IGBT overpressure absorbing circuit can only absorb limited energy as piezo-resistance, resistance-capacitance absorption etc. because of it, does not reach protective effect in the case.
Summary of the invention
The object of the invention is for the deficiencies in the prior art; a kind of fast detecting overvoltage is provided; after voltage reaches protection threshold values, provide energy discharge passage simultaneously; voltage is avoided to continue the circuit raised; finally reach the object that protection IGBT can not damage because of inversion fault, thus improve the reliability of frequency conversion system of rotor.
Technical solution of the present invention is: a kind of IGBT overvoltage crowbar with high-power energy bleed off ability, is characterized in that: comprise by the current-limiting resistance be connected in series, counnter attack diode, breakdown diode, the 3rd resistance and be attempted by the electric voltage observation circuit 1 that the second resistance on breakdown diode forms; The bleed off circuit be made up of controllable silicon, bleed off circuit and electric voltage observation circuit also connect; The thyristor gating circuit be made up of the voltage stabilizing didoe be connected in series, the second diode and the 3rd diode, the negative electrode of the second diode and the 3rd diode connects, thyristor gating circuit is attempted by the 3rd resistance two ends, and the second diode controls extremely to be connected with silicon controlled with the negative electrode of the 3rd diode.
The present invention is owing to adopting by electric voltage observation circuit, the IGBT overvoltage crowbar that thyristor gating circuit and bleed off circuit are formed, wherein, electric voltage observation circuit is by the current-limiting resistance R1 be connected in series, counnter attack diode D1, breakdown diode BOD1, 3rd resistance R3, and the second resistance R2 be attempted by breakdown diode BOD1 is formed, bleed off circuit is made up of controllable silicon V1, bleed off circuit and electric voltage observation circuit 1 also connect, thyristor gating circuit 2 is by the voltage stabilizing didoe D4 be connected in series, second diode D2 and the 3rd diode D3 is formed, the negative electrode of the second diode D2 and the 3rd diode D3 connects, thyristor gating circuit 2 is attempted by the 3rd resistance R3 two ends, second diode D2 is extremely connected with the control of controllable silicon V1 with the negative electrode of the 3rd diode D3, thus when the present invention is connected on IGBT module T1, if when the voltage on IGBT module T1 exceedes the threshold values of voltage detecting circuit, electric voltage observation circuit 1 can produce a voltage at the 3rd resistance, be added between the control pole of controllable silicon V1 and negative electrode by thyristor gating circuit 2, make controllable silicon V1 conducting, because controllable silicon has the large characteristic of through-current capability, make the energy of DC loop by controllable silicon bleed off, short circuit IGBT, thus avoid the scaling loss of IGBT.The present invention has fast detecting overvoltage, and namely reach protection threshold values provides energy discharge passage, thus avoids the feature of IGBT scaling loss.The present invention is mainly used in the overvoltage protection of IGBT module in rotor frequency conversion speed-adjusting system, improves the reliability of frequency conversion system of rotor.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the present invention uses.
In figure: 1 is electric voltage observation circuit; 2 is thyristor gating circuit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, a kind of IGBT overvoltage crowbar with high-power ability bleed off ability disclosed by the invention, comprises and connects electric voltage observation circuit 1, thyristor gating circuit 2, controllable silicon V1 successively, and controllable silicon V1 forms bleed off circuit.IGBT overvoltage crowbar of the present invention is connected to collector electrode and the emitter two ends of IGBT module T1 to be protected.
Electric voltage observation circuit 1 comprises current-limiting resistance R1, counnter attack diode D1, breakdown diode BOD1, the second resistance R2 and the 3rd resistance R3, current-limiting resistance R1 one end is connected with the collector electrode of IGBT module T1, the other end is connected with the anode of counnter attack diode D1, the negative electrode of counnter attack diode D1 is connected with breakdown diode BOD1 anode, the negative electrode of breakdown diode BOD1 is connected with the 3rd resistance R3 one end, the other end of the 3rd resistance R3 is connected with the emitter of IGBT module T1, and the second resistance R2 is parallel to the two ends of breakdown diode BOD1.
Thyristor gating circuit 2 comprises voltage stabilizing didoe D4, the second diode D2 and the 3rd diode D3, the negative electrode of voltage stabilizing didoe D4 is connected with the negative electrode of the breakdown diode BOD1 of electric voltage observation circuit 1, the anode of voltage stabilizing didoe D4 is connected with the anode of the second diode D2, the negative electrode of the second diode D2 is extremely connected with the control of controllable silicon V1, the negative electrode of the 3rd diode D3 is extremely connected with the control of controllable silicon V1, and anode is connected with the negative electrode of controllable silicon V1.
The anode of controllable silicon V1 is connected with IGBT module T1 collector electrode, and negative electrode is connected with the emitter of IGBT module T1, controls pole and is connected with the negative electrode of thyristor gating circuit second diode D2.
In electric voltage observation circuit 1, breakdown diode BOD1 is when its both end voltage is less than breakover voltage, cut-off state will be in, when voltage exceedes breakover voltage, then change conducting state into rapidly, when breakdown diode BOD1 is in cut-off state, because the resistance of the second resistance R2 in circuit is much larger than the resistance of current-limiting resistance R1 and the 3rd resistance R3, the voltage myopia at the second resistance R2 and the breakdown diode BOD1 two ends in parallel with it equals the voltage at IGBT module T1 two ends, the voltage at the 3rd resistance R3 two ends is about 0, voltage stabilizing didoe D4 then in thyristor gating circuit 2 is in cut-off state, controllable silicon V1 controls between pole and negative electrode without forward voltage, controllable silicon V1 is in cut-off state.When IGBT module voltage raises, the voltage also corresponding rising at breakdown diode BOD1 two ends, when voltage exceedes the breakover voltage of breakdown diode BOD1, breakdown diode BOD1 changes conducting state at once, now breakdown diode BOD1 short circuit, current-limiting resistance R1 becomes bleeder circuit with the 3rd resistor group, the voltage at the 3rd resistance R3 two ends raises, exceed the reverse breakdown voltage of voltage stabilizing didoe D4, voltage stabilizing didoe D4 is made to be transformed into conducting state from cut-off state, second diode D2 forward conduction simultaneously, controllable silicon V1 controls to bear forward voltage between pole and negative electrode, make controllable silicon V1 conducting, after controlled silicon conducting, IGBT module is by controllable silicon short circuit, voltage reduces to 0, no longer hold high voltage, then can not because of overvoltage generation scaling loss.Current-limiting resistance R1 in figure in overvoltage observation circuit 1 plays metering function, after breakdown diode BOD1 conducting, can limit the size of the electric current of the control pole flowing through controllable silicon V1.In thyristor gating circuit, the 3rd diode D3 plays clamping action, clamps down on the voltage between the control pole of controllable silicon V1 and negative electrode, prevents the control pole tension of controllable silicon V1 too high and damages controllable silicon V1.
Claims (1)
1. there is an IGBT overvoltage crowbar for high-power energy bleed off ability, it is characterized in that: comprise by the current-limiting resistance be connected in series (R1), counnter attack diode (D1), breakdown diode (BOD1), the 3rd resistance (R3) and be attempted by the electric voltage observation circuit (1) that the second resistance (R2) on breakdown diode (BOD1) forms; The bleed off circuit be made up of controllable silicon (V1), bleed off circuit and electric voltage observation circuit (1) also connect; The thyristor gating circuit (2) be made up of the voltage stabilizing didoe be connected in series (D4), the second diode (D2) and the 3rd diode (D3), the negative electrode of the second diode (D2) and the 3rd diode (D3) connects, thyristor gating circuit (2) is attempted by the 3rd resistance (R3) two ends, and the second diode (D2) is extremely connected with the control of controllable silicon (V1) with the negative electrode of the 3rd diode (D3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813217.4A CN104868457A (en) | 2014-12-24 | 2014-12-24 | IGBT overvoltage protective circuit capable of large-power energy discharge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813217.4A CN104868457A (en) | 2014-12-24 | 2014-12-24 | IGBT overvoltage protective circuit capable of large-power energy discharge |
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| CN104868457A true CN104868457A (en) | 2015-08-26 |
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| CN201410813217.4A Pending CN104868457A (en) | 2014-12-24 | 2014-12-24 | IGBT overvoltage protective circuit capable of large-power energy discharge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787655A (en) * | 2016-12-29 | 2017-05-31 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC DC side overvoltage protection circuits |
| CN106787656A (en) * | 2016-12-29 | 2017-05-31 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC DC side overvoltage protective systems |
| CN108173467A (en) * | 2018-02-24 | 2018-06-15 | 河南工程学院 | Circuit for controlling motor and control system |
| CN108832601A (en) * | 2018-09-03 | 2018-11-16 | 北京有感科技有限责任公司 | A kind of overvoltage crowbar and its application |
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| CN1835321A (en) * | 2006-03-17 | 2006-09-20 | 中国电力科学研究院 | Breakdown diode triggering thyristor valve over-voltage protector |
| CN101447668A (en) * | 2008-12-17 | 2009-06-03 | 中国电力科学研究院 | Device for breakdown diode to initiatively trigger bypass of thyristor valve string |
| CN102299512A (en) * | 2011-07-18 | 2011-12-28 | 中国电力科学研究院 | High-capacity capacitor overvoltage protection circuit adopting BOD (bistable optical device) element |
| CN203014369U (en) * | 2012-10-12 | 2013-06-19 | 万洲电气股份有限公司 | High-voltage solid soft starter with overvoltage protection function |
| CN204258289U (en) * | 2014-12-24 | 2015-04-08 | 万洲电气股份有限公司 | A kind of IGBT overvoltage crowbar with high-power energy relieving capacity |
-
2014
- 2014-12-24 CN CN201410813217.4A patent/CN104868457A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835321A (en) * | 2006-03-17 | 2006-09-20 | 中国电力科学研究院 | Breakdown diode triggering thyristor valve over-voltage protector |
| CN101447668A (en) * | 2008-12-17 | 2009-06-03 | 中国电力科学研究院 | Device for breakdown diode to initiatively trigger bypass of thyristor valve string |
| CN102299512A (en) * | 2011-07-18 | 2011-12-28 | 中国电力科学研究院 | High-capacity capacitor overvoltage protection circuit adopting BOD (bistable optical device) element |
| CN203014369U (en) * | 2012-10-12 | 2013-06-19 | 万洲电气股份有限公司 | High-voltage solid soft starter with overvoltage protection function |
| CN204258289U (en) * | 2014-12-24 | 2015-04-08 | 万洲电气股份有限公司 | A kind of IGBT overvoltage crowbar with high-power energy relieving capacity |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787655A (en) * | 2016-12-29 | 2017-05-31 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC DC side overvoltage protection circuits |
| CN106787656A (en) * | 2016-12-29 | 2017-05-31 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC DC side overvoltage protective systems |
| CN108173467A (en) * | 2018-02-24 | 2018-06-15 | 河南工程学院 | Circuit for controlling motor and control system |
| CN108173467B (en) * | 2018-02-24 | 2019-10-08 | 河南工程学院 | Circuit for controlling motor and control system |
| CN108832601A (en) * | 2018-09-03 | 2018-11-16 | 北京有感科技有限责任公司 | A kind of overvoltage crowbar and its application |
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Application publication date: 20150826 |
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| RJ01 | Rejection of invention patent application after publication |