CN202929163U - IGBT failure detection circuit - Google Patents
IGBT failure detection circuit Download PDFInfo
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- CN202929163U CN202929163U CN 201220588835 CN201220588835U CN202929163U CN 202929163 U CN202929163 U CN 202929163U CN 201220588835 CN201220588835 CN 201220588835 CN 201220588835 U CN201220588835 U CN 201220588835U CN 202929163 U CN202929163 U CN 202929163U
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Abstract
The utility model discloses an IGBT failure detection circuit, comprising an IGBT damage detection circuit, an IGBT over-current detection circuit, an IGBT overvoltage detection circuit and a signal reactive circuit. The three detection circuits all detect the voltage of the IGBT collector electrode - emitter electrode through voltage comparators with a high sensitivity, and the detection values are respectively compared to the reference voltages set by the voltage comparators. Each detection circuit inputs the detection result in a TTL level form to the signal reactive circuit, when the IGBT is damaged, or over-current or overvoltage fault happens, the fiber illuminating head in the signal reactive circuit is triggered, and an obtained fault feedback signal is transmitted by the fiber in an isolation manner and then output by a high speed optical coupler. According to the IGBT failure detection circuit, whether the IGBT is damaged is detected in time, whether over-current phenomenon of the IGBT happens is detected in real time, whether overvoltage phenomenon of the IGBT happens is detected in real time, and when any fault appears, a fault feedback signal is rapidly output.
Description
Technical field
The utility model relates to a kind of failure detector circuit, especially relates to a kind of IGBT failure detector circuit.
Background technology
Igbt (Insulated Gate Bipolar Transistor--IGBT) is the power device that is composited by power MOSFET and GTR, and characteristic is widely used in various pulse-power apparatus because having high voltage, large electric current, be easy to drive, frequency of operation is wide etc.: as radar transmitter, high-pressure pulse electric sterilization equipment etc.Along with the continuous lifting of IGBT voltage, electric current, frequency level, the price of IGBT is also more and more higher.IGBT itself is a kind of anti-overvoltage, the relatively poor device of anti-conveyance capacity, in use, tend to because of and overcurrent, the overvoltage of utmost point short time cause damage.
On the other hand, at present more and more extensive to the research of IGBT serial connection technology, but mainly concentrate on:
The dynamic voltage balancing of each series IGBT during turning on and off;
The transmission time monitoring of IGBT driving circuit.The fundamental purpose of these two kinds of researchs is to guarantee to greatest extent that in the IGBT series circuit, each IGBT can work.But any one Circuits System all might cause system to work because the individual metablocks device breaks down through after moving for a long time.Particularly huge for component number, and the IGBT series circuit of working under high voltage, large electric current again, the probability that the components and parts fault occurs is compared with low-pressure system higher.In the IGBT series circuit, an IGBT damages, and can increase the voltage that other IGBT bear, and then increases the probability that other IGBT damage; When situation is serious, the control system of whole IGBT series circuit be can destroy, thereby larger system loss and security incident caused.As seen, reliable, the quick IGBT failure detector circuit that responds of research has very important effect to IGBT plural serial stage circuit.
IGBT breaks down three kinds of situations usually: damage, overcurrent, overvoltage.IGBT itself has a very little on state resistance (0.03 ~ 0.06 Ω), namely when IGBT is in opening state, the electric current that flows through IGBT collector-emitter can be in less pressure drop of this on state resistance two ends generation, and this voltage is called the saturation voltage drop of IGBT.In certain junction temperature scope, saturation voltage drop and electric current are linear.In the application of most IGBT, saturation voltage drop is all between 1 ~ 5V.When IGBT turn-offed, because all IGBT are connected in series, in theory, the voltage that each IGBT shares equated.But due to the difference in each IGBT driving circuit transmission time and the difference of IGBT its own switch characteristic, make each IGBT be difficult to turn on and off simultaneously.When other IGBT have opened, busbar voltage will be shared on the IGBT that postpones to open, the upper generation of the IGBT overvoltage that makes these delays open.
In the IGBT series circuit, the reason that causes IGBT to damage has a lot, no matter but which kind of reason causes IGBT to damage, and IGBT collector-emitter is all with breakdown, and its collector emitter voltage becomes 0.Therefore whether drop to 0 by detecting the IGBT collector emitter voltage, can judge whether IGBT damages.When IGBT overcurrent occurs when (comprising short circuit), the saturation voltage drop of the voltage that collector-emitter current produces on state resistance two ends during greater than normal operation.Therefore the saturation voltage drop when detecting the IGBT collector emitter voltage whether higher than normal operation, can judge whether IGBT overcurrent occurs.The IGBT overvoltage occurs in the IGBT turn off process, and is same, by detecting more than whether its collector emitter voltage be increased to suddenly the voltage that the IGBT normal operation allows, can judge whether this IGBT overvoltage occurs.Therefore highly sensitive voltage comparator has been widely used in the fast detecting to voltage at present, as long as by voltage comparator, coordinates its peripheral circuit can realize fast detecting to the IGBT collector emitter voltage.
Summary of the invention
The purpose of this utility model is to provide a kind of IGBT failure detector circuit for IGBT plural serial stage circuit.Utilize this circuit can realize to each IGBT in the IGBT series circuit whether be damaged, the real-time detection of overcurrent and overvoltage, and output feedback signal.
For achieving the above object, the technical solution adopted in the utility model is:
The utility model comprises that IGBT damages testing circuit, IGBT over-current detection circuit, IGBT over-voltage detection circuit, signal feedback circuit; Two test sides that IGBT damages testing circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-current detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-voltage detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; The over-current detection signal output part that IGBT damages testing circuit is connected with first input end of signal feedback circuit; The damage detection signal output terminal of IGBT over-current detection circuit is connected with second input end of signal feedback circuit, and the damage detection signal output terminal of IGBT over-voltage detection circuit is connected with the 3rd input end of signal feedback circuit; The end that IGBT damages testing circuit is connected with an end of IGBT over-current detection circuit and an end of IGBT over-voltage detection circuit simultaneously, and the other end that IGBT damages testing circuit is connected with the other end of IGBT over-current detection circuit and the other end of IGBT over-voltage detection circuit simultaneously.
Described IGBT damages testing circuit, comprise the 1st～4 fast recovery diode VD1, VD2, VD3, VD4, the 1st germanium diode D1, the 1st～3 voltage stabilizing diode VS1, VS2, VS3, the 1st～3 capacitor C 1, C2, C3, the 1st～4 resistance R 1, R2, R3, R4, the 1st voltage comparator U1, the 15V power supply and-the 15V power supply; The negative pole of the 2nd fast recovery diode VD2 is connected with the IGBT collector that is detected, be connected with an end of IGBT over-current detection circuit and an end of IGBT over-voltage detection circuit simultaneously, the negative pole of the 4th fast recovery diode VD4 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT over-current detection circuit and the other end of IGBT over-voltage detection circuit simultaneously; 2 pin of the 1st voltage comparator U1 are connected with first input end of signal feedback circuit.
Described IGBT over-current detection circuit, comprise the 5th～8 fast recovery diode VD5, VD6, VD7, VD8, the 4th～5 voltage stabilizing diode VS4, VS5, the 4th～6 capacitor C 4, C5, C6, the 5th～10 resistance R 5, R6, R7, R8, R9, R10, the 2nd～3 voltage comparator U2, U3, biconditional gate U4, the 2nd germanium diode D2, the 15V power supply and-the 15V power supply; The negative pole of the 6th fast recovery diode VD6 is connected with the IGBT collector that is detected, be connected with an end of IGBT damage testing circuit and an end of IGBT over-voltage detection circuit simultaneously, the negative pole of the 8th fast recovery diode VD8 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT damage testing circuit and the other end of IGBT over-voltage detection circuit simultaneously; 3 pin of biconditional gate U4 are connected with second input end of signal feedback circuit.
Described IGBT over-voltage detection circuit comprises avalanche diode VA1, the 3rd germanium diode D3, the 6th voltage stabilizing diode VS6, the 7th～9 capacitor C 7, C8, C9, the 11st～14 resistance R 11, R12, R13, R14, the 4th voltage comparator U5, not gate U6, the 15V power supply and-the 15V power supply; The negative pole of avalanche diode VA1 is connected with the IGBT collector that is detected, be connected with an end of IGBT damage testing circuit and an end of IGBT over-current detection circuit simultaneously, the negative pole of the 3rd D3 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT damage testing circuit and the other end of IGBT over-current detection circuit simultaneously; 2 pin of not gate U6 are connected with the 3rd input end of signal feedback circuit.
Described signal feedback circuit IGBT, comprise the 7th voltage stabilizing diode VS7, the 10th～11 capacitor C 10, C11, the 15th～20 resistance R 15, R16, R17, R18, R19, R20, three input nand gate U7, optical fiber luminescent head U8, optical fiber is received bare headed U9, high speed photo coupling U10, triode Q1, the 15V power supply and-the 15V power supply; 1 pin of three input nand gate U7 is first input end of signal feedback circuit, and 2 pin that damage the voltage comparator U1 of testing circuit with IGBT are connected; 2 pin of three input nand gate U7 are second input end of signal feedback circuit, are connected with 3 pin of the biconditional gate U4 of IGBT over-current detection circuit; 13 pin of three input nand gate U7 are the 3rd input end of signal feedback circuit, are connected with 2 pin of the not gate U6 of IGBT over-voltage detection circuit; Optical fiber luminescent head U8 receives bare headed U9 with optical fiber and is connected by optical fiber; 6 pin of high speed photo coupling U10 are feedback signal output terminals.
The beneficial effect that the utlity model has is:
Whether 1) detect in real time IGBT damages.
2) detect in real time IGBT and overcurrent (comprising short circuit) whether occurs.
3) detect in real time IGBT and overvoltage whether occurs.
4) when any fault appears in damage, overcurrent, overvoltage in IGBT, can export fast the fault feedback signal.
Description of drawings
Fig. 1 is general structure block diagram of the present utility model.
Fig. 2 is that IGBT of the present utility model damages testing circuit figure.
Fig. 3 is IGBT over-current detection circuit figure of the present utility model.
Fig. 4 is IGBT over-voltage detection circuit figure of the present utility model.
Fig. 5 is signal feedback circuit figure of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model will be further described.
Fig. 1 is the utility model general structure block diagram.Comprise that IGBT damages testing circuit, IGBT over-current detection circuit, IGBT over-voltage detection circuit, signal feedback circuit; Two test sides that IGBT damages testing circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-current detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-voltage detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; The over-current detection signal output part that IGBT damages testing circuit is connected with first input end of signal feedback circuit; The damage detection signal output terminal of IGBT over-current detection circuit is connected with second input end of signal feedback circuit, and the damage detection signal output terminal of IGBT over-voltage detection circuit is connected with the 3rd input end of signal feedback circuit; The end that IGBT damages testing circuit is connected with an end of IGBT over-current detection circuit and an end of IGBT over-voltage detection circuit simultaneously, and the other end that IGBT damages testing circuit is connected with the other end of IGBT over-current detection circuit and the other end of IGBT over-voltage detection circuit simultaneously.IGBT damages testing circuit for the real-time detection whether IGBT is damaged, the IGBT over-current detection circuit is used for whether IGBT is occured the real-time detection of overcurrent, the IGBT over-voltage detection circuit is used for whether IGBT is occured the real-time detection of overvoltage, and signal feedback circuit is used for that IGBT is damaged detection signal, IGBT over-current detection signal, IGBT overvoltage detection signal and is converted into feedback signal output.
Fig. 2 is that IGBT of the present utility model damages testing circuit figure.5 pin of voltage comparator U1 are the comparative voltage input end, simultaneously the negative pole of connecting resistance R1 and voltage stabilizing diode VS1.The positive pole of another termination 15V power supply of R1, the positive pole of VS1 connects the positive pole of fast recovery diode VD1, and the negative pole of VD1 connects the positive pole of fast recovery diode VD2, and the negative pole of VD2 connects the collector of detected IGBT.The emitter of detected IGBT is as the voltage reference points of testing circuit, and is connected with the positive pole of the negative pole of 15V power supply and-15V power supply.The input voltage of 5 pin of U1 is: the forward voltage drop the when forward voltage drop when the voltage stabilizing value of VS1, VD1 conducting, VD2 conducting, IGBT collector emitter voltage, and four sums, this voltage can not surpass the operating voltage of U1, namely less than 15V.4 pin of U1 are the reference voltage input terminal of voltage comparator, the end of while connecting resistance R2 and the positive pole of germanium diode D1, the negative pole of D1 connects the negative pole of voltage stabilizing diode VS2, the positive pole of VS2 connects the positive pole of fast recovery diode VD3, the negative pole of VD3 connects the positive pole of fast recovery diode VD4, and the negative pole of VD4 connects the emitter of detected IGBT; The other end of R2 is connected with the positive pole of 15V power supply.The 4 pin input voltages of U1 are: the forward voltage drop sum of three diodes when the voltage stabilizing value of VS2 adds D1, VD3, VD4 conducting, this voltage can not surpass the operating voltage of U1, namely should be less than 15 V.
As shown in Figure 2,3 pin of U1 and 12 pin connect respectively the 15V positive source and-negative pole of 15V power supply, simultaneously the 15V power supply and-both positive and negative polarity each filter capacitor C2, a C1 in parallel of 15V power supply.2 pin of U1 are that IGBT damages the detection signal output pin, for obtaining the Transistor-Transistor Logic level of 5V, adopt by resistance R 3, R4 voltage stabilizing diode VS3, the pressure limiting circuit that filter capacitor C3 and 15V power supply form; 2 pin of the termination U1 of R3 wherein, the other end is connected with the negative pole of VS3 and the end of R4, the positive pole of another termination 15V power supply of R4, C3 is in parallel with VS3, and the positive pole of VS3 is connected with the IGBT emitter as voltage reference points.
As shown in Figure 2, U1 is necessary for highly sensitive voltage comparator, as LM339.
As shown in Figure 2, four fast recovery diode VD1, VD2, VD3, VD4 should be the identical high-voltage diode of model, and the voltage that requires the withstand voltage sum of VD1 and VD2 to can bear higher than IGBT collector-emitter is as selecting HER108; D1 is the germanium diode of forward conduction voltage drop between 0.2 ~ 0.4V, as 1N60P.
As shown in Figure 2, VS1, VS2 should be the identical voltage stabilizing diode of model, and be as far as possible little for the comparative voltage fluctuation that makes input voltage comparer U1, requires the voltage stabilizing value domain of walker of VS1, VS2 little, therefore need select the less diode of voltage stabilizing value, as 3.3V voltage stabilizing diode 1N4728; VS3 is necessary for the 5.1V voltage stabilizing diode, as 1N4733.
As shown in Figure 3, be IGBT over-current detection circuit figure of the present utility model.5 pin of voltage comparator U2 are the comparative voltage input end, connect the adjustable end of three end adjustable resistance R5.The end of the stiff end connecting resistance R6 of R5, the other end of R6 is connected with the positive pole of 15V power supply, another of R5 be the positive pole of termination fast recovery diode VD5 fixedly, and the negative pole of VD5 connects the positive pole of fast recovery diode VD6, and the negative pole of VD6 connects the collector of IGBT.The emitter of IGBT is as the voltage reference points of testing circuit, and is connected with the positive pole of the negative pole of 15V power supply and-15V power supply.The input voltage of 5 pin of U2 is: forward voltage drop, IGBT collector emitter voltage when the adjustable end of R5 and the forward voltage drop when being connected on pressure drop between the stiff end of R5 of VD5 positive pole, VD5 conducting, VD6 conducting, four sums, this voltage can not surpass the operating voltage of U2, namely less than 15V.4 pin of U2 are the voltage comparator reference voltage input terminal, the end of while connecting resistance R7 and the negative pole of voltage stabilizing diode VS4, the positive pole of another termination 15V power supply of R7, the positive pole of VS4 connects the positive pole of fast recovery diode VD7, the negative pole of VD7 connects the positive pole of fast recovery diode VD8, and the negative pole of VD8 connects the emitter of detected IGBT.The input voltage of 4 pin of U2 is: the forward voltage drop the when forward voltage drop when the voltage stabilizing value of VS4, VD7 conducting, VD8 conducting, and three's sum, this voltage can not surpass the operating voltage of U2, namely should be less than 15V.
As shown in Figure 3,5 pin of voltage comparator U3 are the comparative voltage input end, connect 5 pin of U2; 4 pin of U3 are the reference voltage input terminal of voltage comparator, connect the negative pole of germanium diode D2, and the positive pole of D2 connects the positive pole of 15V power supply.
As shown in Figure 3,3 pin of U2 and 12 pin connect respectively the 15V positive source and-negative pole of 15V power supply, simultaneously the 15V power supply and-both positive and negative polarity each filter capacitor C4, a C5 in parallel of 15V power supply, 3 pin of U3 and 12 pin connect respectively the 15V positive source and-negative pole of 15V power supply.2 pin of U2 and U3 are the voltage comparison signal output pin, for obtaining the Transistor-Transistor Logic level of 5V, adopt by resistance R 8, R9, R10 voltage stabilizing diode VS5, the pressure limiting circuit that filter capacitor C6 and 15V power supply form; 2 pin of the termination U2 of R8 wherein, the other end is connected with the negative pole of VS5 and the end of R9 simultaneously, the positive pole of another termination 15V power supply of R9, C6 is in parallel with VS5, and the positive pole of VS5 is connected with the IGBT emitter as voltage reference points.The negative pole of VS5 is connected with the end of R10, and the other end of R10 is connected with 2 pin of U3.
As shown in Figure 3,1 pin of biconditional gate U4 is connected with 2 pin of U3, and 2 pin of U4 are connected with 2 pin of U2, and 14 pin of U4 are connected with the negative pole of VS5, and 7 pin of U4 are voltage reference points, are connected with the emitter of IGBT.3 pin of U4 are that IGBT damages the detection signal output pin.
As shown in Figure 3, U2, U3 are necessary for highly sensitive voltage comparator, and as LM339, U3 is necessary for biconditional gate, as 74LS266.
As shown in Figure 3, four fast recovery diode VD5, VD6, VD7, VD8 should be the identical high-voltage diode of model, and the voltage that requires the withstand voltage sum of VD5 and VD6 to can bear higher than IGBT collector-emitter is as selecting HER108; D2 is the germanium diode of forward conduction voltage drop between 0.2 ~ 0.4V, as 1N60P.
As shown in Figure 3, because the saturation voltage drop of IGBT is less, for the overcurrent value that detects more accurately IGBT can have larger sensing range simultaneously, the voltage of 4 pin of requirement input U2 can not be too large, can not be too little; Too greatly be difficult to guarantee accuracy of detection, and might surpass the supply voltage of U2; Too little sensing range is inadequate.Therefore, the voltage stabilizing value of VS4 should be moderate, namely between 5 ~ 10V, as selecting 6.8V voltage stabilizing diode 1N4736; VS5 is necessary for the 5.1V voltage stabilizing diode, as 1N4733.
As shown in Figure 4, be IGBT over-voltage detection circuit figure of the present utility model.5 pin of voltage comparator U5 are the comparative voltage input end, simultaneously the end of connecting resistance R11 and an end of resistance R 12.The positive pole of another termination avalanche diode VA1 of R11, the negative pole of VA1 connects the collector of detected IGBT.The other end of R12 is connected with the emitter of detected IGBT, and the emitter of IGBT is as the voltage reference points of testing circuit, and is connected with the positive pole of the negative pole of 15V power supply and-15V power supply.The 5 pin input voltages of U5 are the voltage at R12 two ends.4 pin of U5 are the reference voltage input terminal of voltage comparator, connect the positive pole of germanium diode D3, and the negative pole of D3 connects the emitter of IGBT.The 4 pin input voltages of U5 are the forward voltage drop of D3.
As shown in Figure 4,3 pin of U5 and 12 pin connect respectively the 15V positive source and-negative pole of 15V power supply, simultaneously the 15V power supply and-two ends each filter capacitor C8, a C9 in parallel of 15V power supply.2 pin of U5 are voltage comparator signal output pin, for obtaining the Transistor-Transistor Logic level of 5V, adopt by resistance R 13, R14 voltage stabilizing diode VS6, the pressure limiting circuit that filter capacitor C7 and 15V power supply form; 2 pin of the termination U5 of R14 wherein, the other end is connected with the negative pole of VS6 and the end of R13, the positive pole of another termination 15V power supply of R13, C7 is in parallel with VS6, and the positive pole of VS6 is connected with the IGBT emitter as voltage reference points.1 pin of the 2 pin U6 of U2 is connected, and 14 pin of U6 are connected with the negative pole of VS6, and 7 pin of U6 are that voltage reference points is connected with the IGBT emitter.2 pin of U6 are IGBT overvoltage detection signal output pin.
As shown in Figure 4, U5 is necessary for highly sensitive voltage comparator, as LM339; U6 is necessary for not gate, as 74LS04.
As shown in Figure 4, VA1 is necessary for high withstand voltage avalanche diode, its withstand voltage should allow between the maximum functional of IGBT collector emitter voltage between voltage and voltage breakdown, for example: it is 800V that the maximum functional of IGBT allows voltage, the voltage breakdown of IGBT is 1200V, optional withstand voltage be the avalanche diode BYW56 of 1000V.
As shown in Figure 4, when overvoltage appearred in IGBT, VA1 was reversed and punctures, and electric current flows through from R11, R12, and for the Limited Current size, R11 should select the larger resistance of resistance, as 10k Ω; R12 is sampling resistor, and the voltage on R12 is directly inputted 5 pin of U5, and this input voltage can not surpass the supply voltage of U5 can not be too little, if too little, can't compare with the 4 pin voltages of U5, so the resistance of R12 can be between 10 ~ 100 Ω.
As shown in Figure 4, VS6 is necessary for the 5.1V voltage stabilizing diode, as 1N4733.For increasing the overvoltage accuracy of detection, require the 4 pin voltages of U5 to keep a less burning voltage, so the germanium diode of the optional forward conduction voltage drop of D3 between 0.2 ~ 0.4V, as 1N60P.
As shown in Figure 5, be signal feedback circuit figure of the present utility model.1 pin of three input nand gate U7 is connected with 2 pin that IGBT damages voltage comparator U1 in testing circuit, and 2 pin of U7 are connected with 3 pin of biconditional gate U4 in the IGBT over-current detection circuit, and 13 pin of U7 are connected with 2 pin of not gate U6 in the IGBT over-voltage detection circuit.U7 needs the 5V power supply, adopts by resistance R 15 voltage stabilizing diode VS7, the pressure limiting circuit that filter capacitor C10 and 15V power supply form; The negative pole of the termination VS7 of R15 wherein, the positive pole of another termination 15V power supply of R15, C10 is in parallel with VS7, and the positive pole of VS7 is connected with 7 pin of IGBT emitter, U7 as voltage reference points simultaneously.12 pin of U7 are connected with an end of resistance R 16, the other end of R16 is connected with the base stage of triode Q1, and the collector of Q1 is connected with the positive pole of 15V power supply, and the emitter of Q1 is connected with the end of R17, the other end of R17 is connected with 2 pin of optical fiber luminescent head U8, and 3 pin of U8 are connected with 7 pin of U7.
As shown in Figure 5, U8 is connected bare headed U9 and connects by optical fiber with optical fiber, and 2 pin of U9 connect the positive pole of 5V power supply and an end of resistance R 18 simultaneously; The other end of R18 connects 6 pin of U9 and 2 pin of high speed photo coupling U10 simultaneously; 3 pin of U10 are connected with the negative pole of 5V power supply, and are connected with 7 pin with 3 pin of U9 simultaneously.8 pin of U10 are connected with 7 pin, and simultaneously with the 5V power supply with positive pole and an end of resistance R 19 be connected; The other end of R19 is connected with 6 pin of U10, and this pin is the feedback signal output pin.5 pin of U10 connect the negative pole of 5V power supply, parallel filtering capacitor C 11 between the both positive and negative polarity of 5V power supply.
As shown in Figure 5, U6 is three input nand gates, optional 74LS10; U8 is the optical fiber luminescent head, optional HFBR-1414; U9 is that optical fiber is received shaven head, optional HFBR-2412; U10 is high speed photo coupling, optional 6N137.
As shown in Figure 5, separate two power supplys when 5V power supply and 15V power supply, negative pole both are not connected.
As shown in Figure 5, VS7 is necessary for the 5.1V voltage stabilizing diode, as 1N4733.
As shown in Figure 5, Q1 is necessary for output current greater than the Technitron of 20 mA, as 9014.
The course of work of the present utility model is as follows:
The voltage that IGBT damages 5 pin of input voltage comparer U1 in testing circuit is: the forward voltage drop the when forward voltage drop when the voltage stabilizing value of voltage stabilizing diode VS1, VD1 conducting, VD2 conducting, IGBT collector emitter voltage, four sums; The voltage of 4 pin of input U1 is steady state values, the forward voltage drop sum of three diodes when the voltage stabilizing value that equals VS2 adds D1, VD3, VD4 conducting.The voltage stabilizing value of VS1, VS2 is equal, and the forward voltage drop when VD1, VD2, VD3, VD4 conducting equates, will judge that therefore the size of the forward voltage drop when whether IGBT only is damaged relatively IGBT collector emitter voltage and germanium diode D1 conducting gets final product.If IGBT is in off state, VD1, VD2 oppositely end, and the 5 pin input voltages of U1 are drawn high and are 15V, greater than the input voltage of 4 pin of U1, and the 2 pin output high level " 1 " of U1; If be in conducting state, the forward voltage drop of the saturation voltage drop of its collector emitter voltage during higher than the D1 conducting, so the 5 pin voltages of U1 are higher than the 4 pin voltages of U1, the 2 pin output high level " 1 " of U1.When IGBT damages constantly, collector-emitter is breakdown, its collector-emission very 0, and the forward voltage drop during lower than the D1 conducting, the voltage of 5 pin of U1 is lower than the voltage of 4 pin of U1, the 2 pin output low levels " 0 " of U1.When therefore IGBT is normal, the 2 pin outputs " 1 " of U1; When IGBT damages, the 2 pin outputs " 0 " of U1.
In the IGBT over-current detection circuit, the 5 pin voltages of input U2 are: forward voltage drop, IGBT collector emitter voltage when the adjustable end of R5 and the forward voltage drop when being connected on pressure drop between the stiff end of R5 of VD5 positive pole, VD5 conducting, VD6 conducting, four sums; The voltage of 4 pin of input U2 is steady state values, and its size is: the forward voltage drop the when forward voltage drop when the voltage stabilizing value of VS4, VD7 conducting, VD8 conducting, three's sum.Forward voltage drop when VD5, VD6, VD7, VD8 conducting equates, therefore judge the 2 pin output levels of U2, only need the adjustable end of R5 relatively and be connected on the size that pressure drop between the stiff end of R5 of VD5 positive pole adds the voltage stabilizing value of the value of IGBT collector emitter voltage and VS4 to get final product.When IGBT was in off state, VD5, VD6 oppositely ended, and the input voltage of 5 pin of U2 is drawn high and is 15V, and greater than the 4 pin input voltages of U2,2 pin of U2 are exported high level " 1 ".
During the IGBT conducting, its collector emitter voltage U
CEWith the electric current I that flows through collector and emitter
CLinear: U
CE=R
onI
C, R wherein
onBe IGBT collector-emitter on state resistance, its large I is by in the datasheet parameter of searching each IGBT manufacturer and providing, and the saturation voltage drop under specific currents can draw the collector current of this saturation voltage drop divided by correspondence; Also can be under the IGBT conducting state, make its collector flow through small electric stream (1 ~ 5A), measure its collector emitter voltage with high-precision multimeter, and calculate, or directly measure its collector-emitter resistance.If the I that allows in IGBT work
CMaximal value be I
C (max), can calculate U this moment
CESize, be made as U
CE (max)If: the adjustable end of R5 and the pressure drop that is connected between the stiff end of R5 of VD5 positive pole are U
R5, the position of adjusting the adjustable end of R5 can change U
R5Size.Regulate the position of the adjustable end of R5, make U
R5With U
CE (max)Sum equates with the voltage stabilizing value of VS4.When IGBT works, U
CELess than U
CE (max), namely the voltage of 5 pin of U2 is lower than the voltage of 4 pin of U2, the 2 pin output low levels " 0 " of U2.When the IGBT overcurrent when (comprising short circuit), U
CEGreater than U
CE (max), so the voltage of 5 pin of U2 is higher than the voltage of 4 pin of U2, the 2 pin output high level " 1 " of U2.
In the IGBT over-current detection circuit, the voltage of 5 pin of input U3 equates with the voltage of 5 pin of inputting U2, and the voltage of 4 pin of U3 is the forward voltage drop of 15V when deducting the D2 conducting.Forward voltage drop during the D2 conducting is 0.2 ~ 0.4V, so the 4 pin voltages of U3 are a little less than 15V.Above analysis as can be known, IGBT is in off state, the voltage of 5 pin of U3 is 15V, higher than the voltage of 4 pin of U3, the 2 pin output high level " 1 " of U3.When IGBT opened, if normal operation, the voltage of 5 pin of U3 was lower than the voltage of 4 pin of U3, the 2 pin output low levels " 0 " of U3.When overcurrent appears in IGBT, U
CEGreater than U
CE (max)By the IGBT characteristic as can be known, the saturation voltage drop that during the IGBT short circuit, (limiting current) produces is still very little, 6.5kV series IGBT module as the highest in present electric pressure, its maximum saturation pressure drop is still less than 5V, therefore the voltage of 5 pin of U3 is lower than the voltage of 4 pin of U3, the 2 pin output low levels " 0 " of U3.Hence one can see that, and 2 pin of 2 pin of U2 and U3 are exported " 1 " simultaneously when IGBT turn-offs; During the IGBT normally, 2 pin of U2 and 2 pin of U3 are exported " 0 " simultaneously; The IGBT overcurrent is when (comprising short circuit), and 2 pin of U2 are exported " 1 ", the 2 pin outputs " 0 " of U3.2 pin of U2 and 2 pin of U3 are inputted biconditional gate U4 simultaneously, and the effect of U4 is output " 1 " when input is identical, and input is output " 0 " simultaneously not.When therefore IGBT is normal, the 3 pin outputs " 1 " of U4; During the IGBT overcurrent, the 3 pin outputs " 0 " of U4.
In the IGBT over-voltage detection circuit, the voltage breakdown of avalanche diode VA1 is higher than the IGBT normal operation maximum voltage that allows.In IGBT when normal operation,, VA1 oppositely ends, and in R12, no current flows through, so the 5 pin voltages of U5 are 0, and the 4 pin voltages of U5 are the forward conduction voltage drop of germanium diode D3, the 2 pin outputs " 0 " of U5.When the IGBT overvoltage, the VA1 reverse breakdown flows through certain electric current in R12, and the voltage that this electric current produces at R12 two ends is during greater than the forward conduction voltage drop of D3, and the 5 pin voltages of U5 are greater than the 4 pin voltages of U5, the 2 pin outputs " 1 " of U5.1 pin of the level input not gate U6 of the 2 pin outputs of U5 is after level is reverse, by the 2 pin outputs of U6.When therefore IGBT is normal, the 2 pin outputs " 1 " of U6; During the IGBT overcurrent, the 2 pin outputs " 0 " of U6.
2 pin of 2 pin of U1,3 pin of U4, U6 are 1 pin, 2 pin and 13 pin of input signal feedback circuit U7 respectively.U7 is three input nand gates, any one tunnel input " 0 ", and 12 pin of U7 are all exported " 1 ".By above analysis as can be known, any alignment detection circuit breaks down, and 12 pin of U6 are all exported " 1 ", triode Q1 conducting this moment, and optical fiber luminescent head U8 is triggered luminous.After the bare headed U9 of optical fiber receipts receives light signal, the 6 pin outputs " 0 " of U9, high speed photo coupling U10 cut-off, its 6 pin output high level " 1 ".When IGBT worked, three road detection signals were " 1 ", the 12 pin outputs " 0 " of U7, and the Q1 cut-off, optical fiber is not worked.Therefore the 6 pin outputs " 1 " of U9, U10 work, its 6 pin output low levels " 0 ".The height that therefore only need judge the 6 pin output levels of U10 knows namely whether IGBT breaks down.
Claims (5)
1. an IGBT failure detector circuit, is characterized in that: comprise that IGBT damages testing circuit, IGBT over-current detection circuit, IGBT over-voltage detection circuit, signal feedback circuit; Two test sides that IGBT damages testing circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-current detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; Two test sides of IGBT over-voltage detection circuit are connected with the collector and emitter of the IGBT that is detected respectively; The over-current detection signal output part that IGBT damages testing circuit is connected with first input end of signal feedback circuit; The damage detection signal output terminal of IGBT over-current detection circuit is connected with second input end of signal feedback circuit, and the damage detection signal output terminal of IGBT over-voltage detection circuit is connected with the 3rd input end of signal feedback circuit; The end that IGBT damages testing circuit is connected with an end of IGBT over-current detection circuit and an end of IGBT over-voltage detection circuit simultaneously, and the other end that IGBT damages testing circuit is connected with the other end of IGBT over-current detection circuit and the other end of IGBT over-voltage detection circuit simultaneously.
2. a kind of IGBT failure detector circuit according to claim 1, it is characterized in that: described IGBT damages testing circuit, comprise the 1st～4 fast recovery diode VD1, VD2, VD3, VD4, the 1st germanium diode D1, the 1st～3 voltage stabilizing diode VS1, VS2, VS3, the 1st～3 capacitor C 1, C2, C3, the 1st～4 resistance R 1, R2, R3, R4, the 1st voltage comparator U1, the 15V power supply and-the 15V power supply; The negative pole of the 2nd fast recovery diode VD2 is connected with the IGBT collector that is detected, be connected with an end of IGBT over-current detection circuit and an end of IGBT over-voltage detection circuit simultaneously, the negative pole of the 4th fast recovery diode VD4 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT over-current detection circuit and the other end of IGBT over-voltage detection circuit simultaneously; 2 pin of the 1st voltage comparator U1 are connected with first input end of signal feedback circuit.
3. IGBT failure detector circuit according to claim 1, it is characterized in that: described IGBT over-current detection circuit, comprise the 5th～8 fast recovery diode VD5, VD6, VD7, VD8, the 4th～5 voltage stabilizing diode VS4, VS5, the 4th～6 capacitor C 4, C5, C6, the 5th～10 resistance R 5, R6, R7, R8, R9, R10, the 2nd～3 voltage comparator U2, U3, biconditional gate U4, the 2nd germanium diode D2, the 15V power supply and-the 15V power supply; The negative pole of the 6th fast recovery diode VD6 is connected with the IGBT collector that is detected, be connected with an end of IGBT damage testing circuit and an end of IGBT over-voltage detection circuit simultaneously, the negative pole of the 8th fast recovery diode VD8 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT damage testing circuit and the other end of IGBT over-voltage detection circuit simultaneously; 3 pin of biconditional gate U4 are connected with second input end of signal feedback circuit.
4. IGBT failure detector circuit according to claim 1, it is characterized in that: described IGBT over-voltage detection circuit, comprise avalanche diode VA1, the 3rd germanium diode D3, the 6th voltage stabilizing diode VS6, the 7th～9 capacitor C 7, C8, C9, the 11st～14 resistance R 11, R12, R13, R14, the 4th voltage comparator U5, not gate U6, the 15V power supply and-the 15V power supply; The negative pole of avalanche diode VA1 is connected with the IGBT collector that is detected, be connected with an end of IGBT damage testing circuit and an end of IGBT over-current detection circuit simultaneously, the negative pole of the 3rd D3 is connected with the IGBT emitter that is detected, and is connected with the other end of IGBT damage testing circuit and the other end of IGBT over-current detection circuit simultaneously; 2 pin of not gate U6 are connected with the 3rd input end of signal feedback circuit.
5. a kind of IGBT failure detector circuit according to claim 1, it is characterized in that: described signal feedback circuit IGBT, comprise the 7th voltage stabilizing diode VS7, the 10th～11 capacitor C 10, C11, the 15th～20 resistance R 15, R16, R17, R18, R19, R20, three input nand gate U7, optical fiber luminescent head U8, optical fiber is received bare headed U9, high speed photo coupling U10, triode Q1, the 15V power supply and-the 15V power supply; 1 pin of three input nand gate U7 is first input end of signal feedback circuit, and 2 pin that damage the voltage comparator U1 of testing circuit with IGBT are connected; 2 pin of three input nand gate U7 are second input end of signal feedback circuit, are connected with 3 pin of the biconditional gate U4 of IGBT over-current detection circuit; 13 pin of three input nand gate U7 are the 3rd input end of signal feedback circuit, are connected with 2 pin of the not gate U6 of IGBT over-voltage detection circuit; Optical fiber luminescent head U8 receives bare headed U9 with optical fiber and is connected by optical fiber; 6 pin of high speed photo coupling U10 are feedback signal output terminals.
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| CN 201220588835 CN202929163U (en) | 2012-11-09 | 2012-11-09 | IGBT failure detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220588835 CN202929163U (en) | 2012-11-09 | 2012-11-09 | IGBT failure detection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105388408A (en) * | 2015-11-05 | 2016-03-09 | 新誉轨道交通科技有限公司 | IGBT switch fault detection system and detection method |
| CN107994555A (en) * | 2018-01-20 | 2018-05-04 | 深圳市众祥安全科技有限公司 | Single-phase arc extinguishing type breaker and short-circuit protection method with real-time monitoring and control |
| CN108957271A (en) * | 2017-05-26 | 2018-12-07 | 许继集团有限公司 | A kind of IGBT driving over current fault monitoring method and device |
| CN110474522A (en) * | 2019-08-19 | 2019-11-19 | 阳光电源股份有限公司 | A kind of more level analog driving circuits of I font and its soft breaking circuit |
| CN112104346A (en) * | 2020-08-31 | 2020-12-18 | 电子科技大学 | IGBT high-voltage drive overcurrent and overvoltage protection circuit |
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2012
- 2012-11-09 CN CN 201220588835 patent/CN202929163U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388408A (en) * | 2015-11-05 | 2016-03-09 | 新誉轨道交通科技有限公司 | IGBT switch fault detection system and detection method |
| CN105388408B (en) * | 2015-11-05 | 2018-05-18 | 新誉轨道交通科技有限公司 | IGBT switch faults detecting system and detection method |
| CN108957271A (en) * | 2017-05-26 | 2018-12-07 | 许继集团有限公司 | A kind of IGBT driving over current fault monitoring method and device |
| CN107994555A (en) * | 2018-01-20 | 2018-05-04 | 深圳市众祥安全科技有限公司 | Single-phase arc extinguishing type breaker and short-circuit protection method with real-time monitoring and control |
| CN107994555B (en) * | 2018-01-20 | 2019-06-21 | 深圳市众祥安全科技有限公司 | Single-phase arc extinguishing type breaker and short-circuit protection method with real-time monitoring and control |
| CN110474522A (en) * | 2019-08-19 | 2019-11-19 | 阳光电源股份有限公司 | A kind of more level analog driving circuits of I font and its soft breaking circuit |
| CN110474522B (en) * | 2019-08-19 | 2020-11-10 | 阳光电源股份有限公司 | I-shaped multi-level analog driving circuit and soft turn-off circuit thereof |
| CN112104346A (en) * | 2020-08-31 | 2020-12-18 | 电子科技大学 | IGBT high-voltage drive overcurrent and overvoltage protection circuit |
| CN112104346B (en) * | 2020-08-31 | 2021-08-06 | 电子科技大学 | IGBT high-voltage drive overcurrent and overvoltage protection circuit |
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