CN205880138U - Thyristor latching current automatic checkout device - Google Patents
Thyristor latching current automatic checkout device Download PDFInfo
- Publication number
- CN205880138U CN205880138U CN201620680913.7U CN201620680913U CN205880138U CN 205880138 U CN205880138 U CN 205880138U CN 201620680913 U CN201620680913 U CN 201620680913U CN 205880138 U CN205880138 U CN 205880138U
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- Prior art keywords
- igct
- power supply
- bipolar transistor
- inductance
- insulated gate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
Abstract
The utility model discloses a thyristor latching current automatic checkout device, it includes step -down chopper circuit and thyristor wiring circuit, step -down chopper circuit includes power vin, auxiliary electrical power source vcc, PWM controller, signal amplification circuit, insulated -gate bipolar transistor, diode D and inductance L, thyristor wiring circuit includes thyristor T and gate drive power B, resistance rp, current relay KA, ampere meter. The utility model discloses can improve test current with less step -length, when reaching thyristor latching current value, can the automatic shutdown regulating current and keep this current value.
Description
Technical field
This utility model relates to HVDC transmission system, is specifically related to holding up of a kind of HVDC transmission system IGCT
Live electric current automatic detection device.
Background technology
It is right that the IGCT that HVDC transmission system uses in use for some time or all needs before changing standby IGCT
The latching current of IGCT is tested, and checks whether its value meets engine request.IGCT latching current is that IGCT is from disconnected
State proceeds to on-state, and after removing triggering signal, can maintain the minimum principal current needed for on-state.The most conventional test circuit such as figure
Shown in 1, it includes power supply E, switch S, slide rheostat R1, resistance R2, inductance L1, IGCT T, resistance R3, resistance R4 and electricity
Pressure table, wherein, the positive pole of power supply E is connected to the sun of IGCT T successively through switch S, slide rheostat R1, resistance R2 and inductance L1
Pole, the negative pole of power supply E is connected to the negative electrode of IGCT T through resistance R4, and voltmeter is connected on resistance R4, the gate pole of IGCT T
Connecting the outfan of a gate-drive power supply B, the two ends of resistance R3 are connected to gate pole and the negative electrode of IGCT T.Slide and become
Device R1 is under maximum in resistance, and during Guan Bi switch S, IGCT T discontinuously turns on.It is gradually reduced R1, makes principal current increase, until every
Not landing during individual triggering end-of-pulsing, at this, the electric current on point is latching current value, sees Fig. 2.
This kind of method of testing needs the most constantly regulation slide rheostat R1, expends the time longer, particularly at test crystalline substance
In the case of brake tube is a fairly large number of, need to take considerable time.It addition, manually regulation variable resistance is due to anthropic factor existence,
Degree of regulation is the highest.
Utility model content
In order to solve the problems referred to above, this utility model patent provides a kind of IGCT latching current automatic detection device, energy
Enough raising with less step-length tests electric current, when reaching IGCT latching current value, it is possible to is automatically stopped regulation electric current and protects
Hold this current value.
For achieving the above object, this utility model adopts the technical scheme that:
A kind of IGCT latching current automatic detection device, it includes buck circuit and IGCT connection circuit, institute
State buck circuit and include power supply Vin, accessory power supply Vcc, PWM controller, signal amplification circuit, insulated gate bipolar crystal
Pipe, diode D and inductance L, described IGCT connection circuit includes IGCT T and gate-drive power supply B, resistance Rp, electric current
Relay K A, ammeter；Wherein, described accessory power supply Vcc is connected to insulated gate through PWM controller and signal amplification circuit successively
The grid of bipolar transistor, is also connected with one corresponding with described electric current relay KA between accessory power supply Vcc and PWM controller
The positive pole of normally opened auxiliary contact K, power supply Vin be connected to the colelctor electrode of insulated gate bipolar transistor, described insulated gate bipolar
The emitter stage of transistor npn npn is successively through inductance L and resistance RpIt is connected to the anode of IGCT T, the minus earth of IGCT T, described
The gate pole of IGCT T is connected to the outfan of gate-drive power supply B, and the negative pole of described diode D is connected to insulated gate bipolar
Between emitter stage and the inductance L of transistor, the positive pole of this diode D is connected to the negative pole of power supply Vin；Described electric current relay
Two ends after the series connection of KA, ammeter are connected to negative pole and the negative electrode of IGCT T of power supply Vin.
Described buck circuit farther includes an electric capacity C, and one end of described electric capacity C is connected to inductance L and resistance Rp
Between, the other end is connected to the negative pole of power supply Vin.
An overcurrent protection fuse it is connected between the positive pole and the colelctor electrode of insulated gate bipolar transistor of power supply Vin
FU。
The operation principle of IGCT latching current automatic detection device:
(1) IGCT T proceeds to on-state, electric current relay KA action from off-state, gives and keeps output voltage letter with PWM controller
Number；If not up to latching current value remove IGBT group signal, IGCT T proceeds to off-state, electric current relay KA from on-state
Returning, PWM controller improves output voltage values.
(2) IGCT T proceeds to on-state, electric current relay KA action from off-state, gives and keeps output voltage letter with PWM controller
Number；If reaching latching current value, removing IGBT group signal, IGCT still keeps on-state, and electric current relay KA keeps, PWM
Controller keeps output voltage values.
(3) utilize chopper circuit as controllable voltage source, realize output voltage by the dutycycle controlling PWM ripple
VoRegulation.
Compared with prior art, this utility model has the advantage that
(1) realize IGCT latching current value automatically and quickly to test；
(2) measuring accuracy can be adjusted according to dutycycle value added.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing IGCT latching current observation circuit；
Fig. 2 is the oscillogram of latching current；
Fig. 3 is the circuit theory diagrams of this utility model IGCT latching current automatic detection device；
Fig. 4 is the working waveform figure of buck circuit in Fig. 3.
Detailed description of the invention
With detailed description of the invention, content of the present utility model is described in further details below in conjunction with the accompanying drawings.
Embodiment
Refer to shown in Fig. 3, a kind of IGCT latching current automatic detection device, it includes buck circuit and brilliant lock
Pipe connection circuit, buck circuit includes power supply Vin, accessory power supply Vcc, PWM controller, signal amplification circuit, insulated gate
Bipolar transistor (IGBT), diode D, inductance L and electric capacity C, IGCT connection circuit includes IGCT T and gate-drive thereof
Power supply B, resistance Rp, electric current relay KA, ammeter；Wherein, accessory power supply Vcc amplifies electricity through PWM controller and signal successively
Road is connected to the grid of insulated gate bipolar transistor, is also connected with one and continues with electric current between accessory power supply Vcc and PWM controller
The positive pole of normally opened auxiliary contact K, power supply Vin that electrical equipment KA is corresponding is connected to the colelctor electrode of insulated gate bipolar transistor, at electricity
An overcurrent protection fuse FU, insulated gate bipolar it is connected between positive pole and the colelctor electrode of insulated gate bipolar transistor of source Vin
The emitter stage of transistor npn npn is successively through inductance L and resistance RpIt is connected to the anode of IGCT T, the minus earth of IGCT T, brilliant lock
The gate pole of pipe T is connected to the outfan of gate-drive power supply B, and the negative pole of diode D is connected to insulated gate bipolar transistor
Between emitter stage and inductance L, the positive pole of this diode D is connected to the negative pole of power supply Vin, one end of electric capacity C be connected to inductance L and
Resistance RpBetween, the other end is connected to the negative pole of power supply Vin；Two ends after the series connection of electric current relay KA, ammeter connect respectively
Negative pole and the negative electrode of IGCT T in power supply Vin.
Buck circuit provides self-adjustable DC voltage, its operation principle opening according to IGBT for test circuit
Logical and shutoff is divided into two stages:
(1) t=ton, i.e. during IGBT conducting, power supply VinPower to the load, output voltage Vo=Vin, electric current i rises；
(2) t=toff, i.e. when IGBT turns off, VoBeing approximately zero, electric current i circulates through sustained diode.Electric current is continuous
Time, load voltage meansigma methods Vo=Vin*ton/(ton+toff)=Vin*ton/ T=α * Vin, as shown in Figure 4.
Flow through the electric current i of IGCT TT=Uo/Rp=α * Vin/Rp。
α is dutycycle, in the range from 0≤α≤1, can be adjusted by regulation IGBT service time in a cycle T
Joint output voltage range is 0≤Uo≤Vin.The drive circuit of IGBT can be by digital operation chip such as PWM controller via signal
Amplifying circuit exports PWM ripple.
Fuse FU, because of fusing when fault makes test electric current excessive, plays protection test component effect.
The current value of electric current relay KA typically arranges the lowest, as long as there being electric current to flow through, and electric current relay KA action, close
Close normally opened auxiliary contact K, give and suspend boost signal with PWM controller one, be i.e. given the triggering signal phase at tested IGCT T
Between, output voltage VoVoltage keeps constant.
The latching current test process of present design is as follows:
(1), when test starts, control chip is with a less duty cycle alpha1Output voltage Vo1, now give and IGCT T
One is triggered pulse so that IGCT T turns on.
(2) when not up to IGCT T latching current value, the electric current i of IGCT T is flow throughTWill only continue for one and trigger arteries and veins
The time t of punchingp, as shown in Figure 2.At tpIn time, owing to electric current relay KA action current is the lowest, electric current relay KA action,
Its normally opened auxiliary contact K closes, and gives and one signal of PWM controller, keeps duty cycle alpha.After thyristor triggering impulse disappears,
Flow through the electric current i of IGCT TTReducing to zero, KA returns, K tripping.Then PWM controller is with α2=α1The dutycycle output electricity of+Δ α
Pressure Vo2, wherein Vo2=V01+ Δ V, i.e. increases the electric current i flowing through IGCT TTValue.
(3) when not up to latching current value, test circuit will repeat step (2) always
(4) at Von=V0(n-1)+ Δ V, i.e. flows through the electric current i of IGCT TTWhen reaching latching current value, even if IGCT touches
Send out pulse to disappear, flow through the electric current i of IGCT TTStill can continue to keep.Now continuation is kept by electric current relay KA, normally opened
Auxiliary contact K is kept closed, and PWM controller keeps output Von=V0(n-1)The voltage of+Δ V.
Above-listed detailed description is illustrating for this utility model possible embodiments, and this embodiment also is not used to limit
The scope of the claims of the present utility model, all equivalences done without departing from this utility model are implemented or change, are intended to be limited solely by this case
In the scope of the claims.
Claims (3)
1. an IGCT latching current automatic detection device, it is characterised in that it includes that buck circuit and IGCT connect
Line circuit, described buck circuit includes power supply Vin, accessory power supply Vcc, PWM controller, signal amplification circuit, insulated gate
Bipolar transistor, diode D and inductance L, described IGCT connection circuit includes IGCT T and gate-drive power supply B, electricity
Resistance Rp, electric current relay KA, ammeter；Wherein, described accessory power supply Vcc connects through PWM controller and signal amplification circuit successively
It is connected to the grid of insulated gate bipolar transistor, between accessory power supply Vcc and PWM controller, is also connected with one continues with described electric current
The positive pole of normally opened auxiliary contact K, power supply Vin that electrical equipment KA is corresponding is connected to the colelctor electrode of insulated gate bipolar transistor, described
The emitter stage of insulated gate bipolar transistor is successively through inductance L and resistance RpIt is connected to the anode of IGCT T, the moon of IGCT T
Pole ground connection, the gate pole of described IGCT T is connected to the outfan of gate-drive power supply B, and the negative pole of described diode D is connected to absolutely
Between emitter stage and the inductance L of edge grid bipolar transistor, the positive pole of this diode D is connected to the negative pole of power supply Vin；Described electricity
Two ends after the series connection of current relay KA, ammeter are connected to negative pole and the negative electrode of IGCT T of power supply Vin.
IGCT latching current automatic detection device the most according to claim 1, it is characterised in that described buck chopper electricity
Road farther includes an electric capacity C, and one end of described electric capacity C is connected to inductance L and resistance RpBetween, the other end is connected to power supply
The negative pole of Vin.
IGCT latching current automatic detection device the most according to claim 1 and 2, it is characterised in that power supply Vin's
An overcurrent protection fuse FU it is connected between positive pole and the colelctor electrode of insulated gate bipolar transistor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620680913.7U CN205880138U (en) | 2016-06-28 | 2016-06-28 | Thyristor latching current automatic checkout device |
| PCT/CN2016/111519 WO2018000771A1 (en) | 2016-06-28 | 2016-12-22 | Thyristor latching current automatic detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620680913.7U CN205880138U (en) | 2016-06-28 | 2016-06-28 | Thyristor latching current automatic checkout device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205880138U true CN205880138U (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620680913.7U Active CN205880138U (en) | 2016-06-28 | 2016-06-28 | Thyristor latching current automatic checkout device |
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| Country | Link |
|---|---|
| CN (1) | CN205880138U (en) |
| WO (1) | WO2018000771A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091980A (en) * | 2017-05-27 | 2017-08-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of IGCT maintains current testing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838848B (en) * | 2020-11-27 | 2022-10-21 | 国网宁夏电力有限公司检修公司 | Insulated gate bipolar transistor series valve structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189566A (en) * | 1982-04-28 | 1983-11-05 | Nec Home Electronics Ltd | Characteristic measuring method of thyristor |
| CN101672887B (en) * | 2008-09-12 | 2013-01-09 | 上海宝冶建设有限公司 | Preventive detection method for performance of variable flow assembly of high-power thyristor |
| CN202453459U (en) * | 2012-01-13 | 2012-09-26 | 福建省电力有限公司电力科学研究院 | Large-power thyristor test device |
| KR101373165B1 (en) * | 2012-11-30 | 2014-03-11 | 주식회사 포스코 | Apparatus and method for detecting failure of thyristor |
-
2016
- 2016-06-28 CN CN201620680913.7U patent/CN205880138U/en active Active
- 2016-12-22 WO PCT/CN2016/111519 patent/WO2018000771A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091980A (en) * | 2017-05-27 | 2017-08-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of IGCT maintains current testing device |
| CN107091980B (en) * | 2017-05-27 | 2023-05-16 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Thyristor maintenance current testing device |
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| Publication number | Publication date |
|---|---|
| WO2018000771A1 (en) | 2018-01-04 |
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