CN102629758B - Voltage comparator-based drop gate voltage circuit - Google Patents

Voltage comparator-based drop gate voltage circuit Download PDF

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Publication number
CN102629758B
CN102629758B CN201210109144.1A CN201210109144A CN102629758B CN 102629758 B CN102629758 B CN 102629758B CN 201210109144 A CN201210109144 A CN 201210109144A CN 102629758 B CN102629758 B CN 102629758B
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China
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voltage
resistance
grid voltage
level
falls
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CN201210109144.1A
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Chinese (zh)
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CN102629758A (en
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相征
刘红奎
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西安电子科技大学
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Abstract

The invention discloses a voltage comparator-based drop gate voltage circuit, which comprises a voltage-dividing resistor R1, a drop gate voltage speed regulating circuit, a first stage of drop gate voltage unit, a second stage of drop gate voltage unit and a third stage of drop gate voltage unit, wherein an output end of the voltage-dividing resistor R1 is connected with an input end of the drop gate voltage speed regulating circuit; output ends of the three drop gate voltage units are connected with the output end of the voltage-dividing resistor R1 and the input end of the drop gate voltage speed regulating circuit respectively; and another output end of a previous stage of drop gate voltage unit is connected with an input end of a next stage of drop gate voltage unit. Three-stage drop gate voltage protection is adopted when a protected power tube encounters over-current; accurate judgment and quick response are performed on over-current threshold voltage by the drop gate voltage units by using a voltage comparator; induced voltage produced during turn-off of the protected power tube can be reduced by the drop gate voltage speed regulating circuit; high-reliability protection over the protected power tube can be realized; and the voltage comparator-based drop gate voltage circuit is particularly suitable for being used in severe environments and at places with high accuracy requirements.

Description

A kind of based on voltage comparator grid voltage circuit falls
Technical field
The invention belongs to electronic technology field; further relate to the circuit that reduces power field effect transistor MOSFET or insulated gate bipolar transistor IGBT grid voltage in a kind of electric and electronic technical field, the protection to MOSFET or the protected power tube of IGBT when this circuit can be used for MOSFET or the protected power tube of IGBT and runs into overcurrent or short circuit.
Background technology
At present, in electric and electronic technical field, safeguard measure when conventional MOSFET or IGBT power tube overcurrent or short circuit has two kinds: a kind of is soft shutoff, and another kind is to fall grid voltage.Soft shutoff refers to when device overcurrent or short-circuit signal being detected, just removes the signal of protected power tube rapidly, and the protected power tube of MOSFET or IGBT is turn-offed; Fall grid voltage and refer to when device overcurrent or short-circuit signal being detected, immediately the grid voltage of MOSFET or the protected power tube of IGBT is dropped to a certain level, but device still maintains conducting.
The poor anti jamming capability of soft shutoff, once fault being detected, turn-off device, be easy to occur misoperation, thereby for increasing the antijamming capability of protective circuit, often obtaining adding a constant time lag between fault-signal and starting protection circuit, yet fault current can sharply rise in this constant time lag, thereby the power loss of device while greatly having increased fault; The increase of simultaneous faults electric current, the di/dt in the time of also can making protected power tube turn-off increases, and the parameter designing between them is difficult to compromise, so the drive circuit of soft turn-off protection, and when fault occurs, protective circuit has started often, but device still damages.The antijamming capability that falls grid voltage is strong, sets a constant time lag after falling grid voltage, if fault-signal still exists after time delay, turn-offs device.Fault current will be limited in a smaller value in this time delay.The restriction of fault current, the power loss of device while having reduced fault, has extended time of device Short Circuit withstand; And the di/dt can reduce protected power tube and turn-off time, very favourable to the protection of device.In time delay, if fault-signal disappears, drive circuit can recover normal operating state automatically, thereby has greatly strengthened the antijamming capability of circuit.
Guangdong Yishite Power Supply Co.,Ltd is at its patent application document " drive circuit that suppresses IGBT overcurrent " (application publication number CN 102315632A; application number 201110310792.9; a kind of drive circuit of the IGBT of inhibition overcurrent is disclosed date of application 2011.10.14); in this circuit, fall grid voltage clamp circuit by capacitor charging being controlled to the slow reduction of protected power tube grid voltage, reach the object of soft shutoff.Dongguan Jingcheng Electric Energy Equipment Co., Ltd. is at its patent application document " a kind of protect perfect IGBT driver " (application publication number CN102290795A; application number 201110252637.6; date of application 2011.08.30) a kind of perfect IGBT driver of protecting is disclosed; this circuit punctures voltage stabilizing didoe by over-current signal, and has with RC loop the object that certain charging interval reaches delay shutoff.In these two disclosed circuit of patent application document, the common problem existing is: circuit is all by capacitor charging is reached to the object of turn-offing protected power tube with this, protective circuit has only accomplished that it is that electric circuit inspection is after over-current signal that grid voltage falls in two-stage, first the grid voltage of protected power tube is dropped to a certain specific level, if over-current signal still exists, then the grid voltage of protected power tube is slowly reduced to 0V; If the too high protected power tube that this specific level arranges suppresses not obvious to over-current phenomenon avoidance, if the too low protected power tube of this specific level setting can exist the problem of repeatedly opening, turn-offing in a time delay; Falling grid voltage circuit uses voltage stabilizing didoe as the judgement device of over-current signal, temperature has a certain impact to the work of voltage stabilizing didoe, during excess Temperature, the actual breakdown voltage of voltage stabilizing didoe and its nominal breakdown voltage have certain difference, also there will be circuit overcurrent and fall the situation that grid voltage protective circuit is not protected under extreme case; In protective circuit, do not regulate protected power tube grid voltage rising, the circuit of fall time.
Yang Dongping; Wang Li; " falling the application of grid voltage technology in MOSFET drives " (Power System and its Automation journal that Jiang Dengyu delivers; 2010.02:1-4) in paper; and Tian Songya; Gan Zhenghua; Sun Ye; " research of a kind of New IGBT driving and protective circuit " (electric welding machine that Fu Weiliang delivers; 2007.07:61-63) in paper fall grid voltage circuit be all by over-current signal to capacitor charging, then by the voltage breakdown voltage stabilizing didoe at electric capacity two ends, realize the protection to MOSFET or the protected power tube of IGBT.The problem of the middle existence of the common issue that the disclosed circuit of these two pieces of papers exists and patent application document " drive circuit that suppresses IGBT overcurrent " and patent application document " a kind of protect perfect IGBT driver " is identical.
Summary of the invention
In order to overcome above-mentioned the problems of the prior art, propose a kind of based on voltage comparator grid voltage circuit falls, can make protected power tube obtain the protection of high reliability.
The present invention includes divider resistance R1, fall grid voltage speed adjustment circuit, grid voltage unit falls in the first order, grid voltage unit falls in the second level, grid voltage unit falls in the third level.The output of divider resistance R1 is connected with the input that falls grid voltage speed adjustment circuit.The output that grid voltage unit falls in the first order is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the output of time delayed signal is connected with the in-phase input end that grid voltage unit falls in the second level.The output that grid voltage unit falls in the second level is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the output of time delayed signal is connected with the in-phase input end that grid voltage unit falls in the third level.The third level falls the output of grid voltage unit and the output of divider resistance R1 is connected with the input that falls grid voltage speed adjustment circuit; Wherein, divider resistance R1 falls grid voltage unit, the second level with the first order respectively and falls resistance R 4, resistance R 3, the resistance R 2 that grid voltage unit, the third level fall in grid voltage unit and form type bleeder circuit, for generation of the driving voltage of the protected power tube grid of protection.Grid voltage speed adjustment circuit falls, for regulating the rise time T of protected power tube conducting rwith T fall time turn-offing f.
Grid voltage unit falls in the first order, for generation of the first order, protects in advance voltage and second level delayed startup voltage, and the first order protects voltage to be used for making the grid voltage of protected power tube to drop to the required voltage of the pre-protection of the first order in advance; Second level delayed startup voltage is for driving the second level to fall the voltage of grid voltage unit starting.
Grid voltage unit falls in the second level, for generation of second level protection voltage and third level delayed startup voltage, second level protection voltage for the grid voltage of protected power tube is dropped to open thresholding need voltage; Third level delayed startup voltage is for driving the third level to fall the voltage of grid voltage unit starting.
Grid voltage unit falls in the third level, for generation of the grid voltage that makes protected power tube, slowly drops to the required third level protection shutoff voltage of 0V.
The present invention compared with prior art tool has the following advantages:
First; the present invention adopts three grades to fall grid voltage circuit protected power tube is protected, and has overcome in prior art, to fall grid voltage and only adopt the protected power tube that two-stage protection exists to suppress problem not obvious and that protected power tube is repeatedly opened, turn-offed in a time delay to over-current phenomenon avoidance.Making the present invention can when power tube breaks down, start the first order falls grid voltage unit protected power tube is protected in advance; and then carry out corresponding conservation treatment according to the state of fault; can effectively prevent that misoperation from occurring; adjacent two-stage is fallen the grid voltage unit starting time and can be regulated arbitrarily according to actual needs; also can increase as required and fall grid voltage unit, realize the more multistage grid voltage of falling.
Second, the present invention has adopted voltage comparator to judge setting overcurrent threshold voltage, overcome and in prior art, used voltage stabilizing didoe judgement overcurrent threshold voltage to cause the problem that precision is not high, realized overcurrent threshold voltage has been judged and response rapidly accurately, as long as setting different threshold voltages just can respond corresponding overcurrent rank, make circuit application more flexible, debugging is more prone to, and is applicable to producing in enormous quantities.
The 3rd; the present invention has adopted and has fallen grid voltage speed adjustment circuit; overcome and in prior art, fallen grid voltage circuit and there is no the slow gentle problem of turn-offing of opening; realized falling the adjusting of grid voltage speed; can set flexibly as required the speed that grid voltage declines or rises; reduce the induced voltage that protected power tube produces when turn-offing, thereby extended the useful life of protected power tube.
Accompanying drawing explanation
Fig. 1 is block diagram of the present invention;
Fig. 2 is electrical schematic diagram of the present invention;
Fig. 3 is the schematic diagram that the present invention protects protected power tube process.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to Fig. 1, circuit of the present invention is explained in detail.
The input of divider resistance R1 is connected with driving signal, and output is connected with the input that falls grid voltage speed adjustment circuit, falls grid voltage speed adjustment circuit and is output as and falls grid voltage guard signal; The output that grid voltage unit falls in the first order is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the output of time delayed signal is connected with the in-phase input end that grid voltage unit falls in the second level; The output that grid voltage unit falls in the second level is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the output of time delayed signal is connected with the in-phase input end that grid voltage unit falls in the third level; The third level falls the output of grid voltage unit and the output of divider resistance R1 is connected with the input that falls grid voltage speed adjustment circuit.
Divider resistance R1 falls grid voltage unit, the second level with the first order respectively and falls resistance R 4, resistance R 3, the resistance R 2 that grid voltage unit, the third level fall in grid voltage unit and form type bleeder circuit, for generation of the driving voltage of the protected power tube grid of protection; The voltage of assigning in resistance R 2, resistance R 3, resistance R 4 is respectively third level protection shutoff voltage, second level protection voltage, the first order and protects in advance the required voltage of voltage, and the power consumption on divider resistance R1, resistance R 2, resistance R 3, resistance R 4 can not surpass its rated disspation.
Grid voltage speed adjustment circuit falls, for regulating the rise time T of protected power tube conducting rwith T fall time turn-offing f; The one end that falls resistance R 5 in grid voltage speed adjustment circuit is connected with the output of divider resistance R1, and the other end is connected with one end of capacitor C 1, and the other end of capacitor C 1 is connected with GND; The value principle of resistance R 5, capacitor C 1 is that the grid voltage speed adjustment circuit that falls that resistance R 5, capacitor C 1 form regulates the time: wherein, t is the rise time of protected power tube conducting and the fall time of shutoff, and U is the voltage to capacitor C charging, U cthe voltage that while being charging, capacitor C two ends reach, capacitor C is the delay capacitor C1 in circuit, and resistance R is the time delay resistance R5 in circuit, and the value of resistance R 5 is as far as possible little.
With reference to Fig. 2, the concrete annexation of the components and parts in electrical schematic diagram of the present invention is described in detail.
The positive power source terminal that voltage comparator U1A in grid voltage unit falls in the first order is connected with VCC, negative power end is connected with GND, inverting input is connected with reference voltage, in-phase input end is connected with over-current signal, output is connected with one end of resistance R 6, resistance R 7 respectively, the other end of resistance R 6 is connected with the base stage of triode Q3, the emitter of triode Q3 is connected with GND, collector electrode is connected with the negative electrode of diode D3, the anode of diode D3 is connected with one end of resistance R 4, and the other end of resistance R 4 is connected with the input of resistance R 5 with divider resistance R1 output, the inverting input that voltage comparator U1B in grid voltage unit falls in the second level is connected with reference voltage, in-phase input end respectively with resistance R 7, one end of capacitor C 2 is connected, the other end of C2 is connected with GND, the output of voltage comparator U1B respectively with resistance R 8, one end of resistance R 9 is connected, the other end of resistance R 8 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with GND, collector electrode is connected with the negative electrode of diode D2, the anode of diode D2 is connected with one end of resistance R 3, the other end of resistance R 3 is connected with the input of resistance R 5 with divider resistance R1 output, the inverting input that voltage comparator U1C in grid voltage unit falls in the third level is connected with reference voltage, in-phase input end is connected with one end of resistance R 9, capacitor C 3 respectively, the other end of C3 is connected with GND, the output of voltage comparator U1C is connected with one end of resistance R 10, the other end of resistance R 10 is connected with the base stage of triode Q1, the emitter of triode Q1 is connected with GND, collector electrode is connected with the negative electrode of diode D1, the anode of diode D1 is connected with one end of resistance R 2, and the other end of resistance R 2 is connected with the input of resistance R 5 with divider resistance R1 output.
With reference to Fig. 3, to the present invention, protect protected power tube process to be explained in detail.
Switch controlling signal is input to the end that enters of Drive and Control Circuit after buffer circuit isolation, after Drive and Control Circuit is processed switch controlling signal, its output is connected with an input that falls grid voltage protective circuit, the input of protected power tube is connected with power supply POWER, output is connected with one end of sampling resistor, the other end of sampling resistor is connected and is connected with one end of load, the other end of load is connected with POWER-GND, the voltage difference at sampling resistor two ends obtains over-current signal after current detecting amplifying circuit amplifies, the over-current signal of current detecting amplifying circuit output is input to another that fall grid voltage protective circuit and enters end, the output of grid voltage protective circuit falls and the grid of protected power tube is connected.
When over-current signal occurs, grid voltage unit starting falls in the first order, the grid voltage of protected power tube is dropped to the value of a setting, protected power tube is protected in advance, now protected power tube is in being about to the rim condition of complete conducting, the voltage that voltage comparator U1A output in grid voltage unit falls in the while first order passes through resistance R 7 to capacitor C 2 charging generation second level delayed startup voltages, if in a fixed delay, over-current signal disappearance protected power tube recovers the state of complete conducting; If after a fixed delay, over-current signal still exists and starts the second level and fall grid voltage unit the grid voltage of protected power tube is dropped to unlatching threshold voltage, power tube is protected, now the state of protected power tube in being about to open.Simultaneously the second level falls the voltage of the voltage comparator U1B output in grid voltage unit 3 chargings produces third level delayed startup voltages to capacitor C by resistance R 9, if in a fixed delay, the over-current signal protected power tube that disappears recovers the state of complete conducting; If after a fixed delay, over-current signal still exists and starts the third level and fall grid voltage unit the grid voltage of protected power tube is slowly dropped to 0V, now the state of protected power tube in closing.The computing formula of fixed delay is: wherein, R is time delay resistance, and C is delay capacitor, and U is the voltage to capacitor charging, U cthe voltage that while being capacitor charging, its two ends reach.
Embodiments of the invention are, resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, the value of R10 can be respectively 1k Ω, 0 Ω, 500 Ω, 2k Ω, 100 Ω, 5k Ω, 2k Ω, 5k Ω, 2k Ω, 5k Ω, capacitor C 1, C2, the value of C3 can be respectively 103F, 102F, 102F, voltage comparator U1A, U1B, U1C is LM339AD, diode D1, D2, D3 is IN4148, triode Q1, Q2, Q3 is C9013, reference voltage is 7.5V, positive supply VCC is 15V, GND is in analog, it is 8 ± 0.5V that the first order is protected the scope of voltage in advance, the scope of second level delayed startup voltage is 7.5V~15V, the scope of second level protection voltage is 5 ± 0.1V, the scope of third level delayed startup voltage is 7.5V~15V, the scope of third level protection shutoff voltage is 0.7 ± 0.05V.
The present invention utilizes voltage comparator judgement overcurrent threshold voltage, thereby the voltage obtaining on divider resistance that turns on and off to control of output signal control triode reaches the object of protecting protected power tube.Fall after grid voltage protective circuit detects over-current signal and first the grid voltage of protected power tube is dropped to the level of a setting; protected power tube is protected in advance; and then make to carry out corresponding conservation treatment according to the state of fault; can effectively prevent that misoperation from occurring; reduced the induced voltage producing when protected power tube turn-offs; make protected power tube obtain the protection of high reliability; circuit has high accuracy; be adapted at using under some environment is severe and required precision is high occasion; circuit debugging is simple, is applicable to producing in enormous quantities.

Claims (6)

  1. Based on voltage comparator a grid voltage circuit falls, comprise divider resistance R1, fall grid voltage speed adjustment circuit, grid voltage unit falls in the first order, grid voltage unit falls in the second level, grid voltage unit falls in the third level; The output of described divider resistance R1 is connected with the input that falls grid voltage speed adjustment circuit; The output that grid voltage unit falls in the described first order is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the time delayed signal output that grid voltage unit falls in the first order is connected with the in-phase input end that grid voltage unit falls in the second level; The output that grid voltage unit falls in the described second level is connected with the input that falls grid voltage speed adjustment circuit with the output of divider resistance R1, and the time delayed signal output that grid voltage unit falls in the second level is connected with the in-phase input end that grid voltage unit falls in the third level; The described third level falls the output of grid voltage unit and the output of divider resistance R1 is connected with the input that falls grid voltage speed adjustment circuit; Wherein,
    Described divider resistance R1 falls grid voltage unit, the second level with the first order respectively and falls resistance R 4, resistance R 3, the resistance R 2 that grid voltage unit, the third level fall in grid voltage unit and form type bleeder circuit, for generation of the driving voltage of the protected power tube grid of protection;
    The described grid voltage speed adjustment circuit that falls, for regulating the rise time T of protected power tube conducting rwith T fall time turn-offing f;
    Grid voltage unit falls in the first order, for generation of the first order, protects in advance voltage and second level delayed startup voltage, and the first order protects voltage to be used for making the grid voltage of protected power tube to drop to the required voltage of the pre-protection of the first order in advance; Second level delayed startup voltage is used for driving the second level to fall the voltage of grid voltage unit starting,
    Grid voltage unit falls in the second level, and for generation of second level protection voltage and third level delayed startup voltage, protection voltage in the second level is opened the required voltage of thresholding for the grid voltage of protected power tube is dropped to; Third level delayed startup voltage is used for driving the third level to fall the voltage of grid voltage unit starting,
    Grid voltage unit falls in the third level, for generation of the grid voltage that makes protected power tube, slowly drops to the required third level protection shutoff voltage of 0V.
  2. According to claim 1 a kind of based on voltage comparator grid voltage circuit falls, it is characterized in that, the value principle of described divider resistance R1 and resistance R 2, resistance R 3, resistance R 4 is that divider resistance R1 forms with resistance R 2, resistance R 3, resistance R 4 respectively type circuit; the voltage of assigning in resistance R 2, resistance R 3, resistance R 4 is respectively third level protection shutoff voltage, second level protection voltage, the first order and protects in advance the required voltage of voltage, and the power consumption on divider resistance R1, resistance R 2, resistance R 3, resistance R 4 can not surpass its rated disspation.
  3. 3. according to claim 1 a kind ofly based on voltage comparator grid voltage circuit falls, it is characterized in that, described one end that falls resistance R 5 in grid voltage speed adjustment circuit is connected with the output of divider resistance R1, and the other end is connected with one end of capacitor C 1, and the other end of capacitor C 1 is connected with GND; The value principle of resistance R 5, capacitor C 1 is: wherein, t is the rise time of protected power tube conducting or the fall time of shutoff, and U is the voltage to capacitor C charging, U cthe voltage that while being charging, capacitor C two ends reach, capacitor C is the delay capacitor C1 in circuit, and resistance R is the time delay resistance R5 in circuit, and the value of resistance R 5 is as far as possible little.
  4. 4. according to claim 1 a kind ofly based on voltage comparator grid voltage circuit falls, it is characterized in that, the positive power source terminal that voltage comparator U1A in grid voltage unit falls in the described first order is connected with VCC, negative power end is connected with GND, the inverting input of voltage comparator U1A is connected with reference voltage, in-phase input end is connected with over-current signal, output respectively with resistance R 6, one end of resistance R 7 is connected, the other end of resistance R 6 is connected with the base stage of triode Q3, the emitter of triode Q3 is connected with GND, collector electrode is connected with the negative electrode of diode D3, the anode of diode D3 is connected with one end of resistance R 4, the inverting input that voltage comparator U1B in grid voltage unit falls in the second level is connected with described reference voltage, in-phase input end is connected with the other end of resistance R 7, one end of capacitor C 2 respectively, the other end of C2 is connected with GND, the output of voltage comparator U1B is connected with one end of resistance R 8, resistance R 9 respectively, the other end of resistance R 8 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with GND, collector electrode is connected with the negative electrode of diode D2, and the anode of diode D2 is connected with one end of resistance R 3, the inverting input that voltage comparator U1C in grid voltage unit falls in the third level is connected with described reference voltage, in-phase input end is connected with the other end of resistance R 9, one end of capacitor C 3 respectively, the other end of C3 is connected with GND, the output of voltage comparator U1C is connected with one end of resistance R 10, the other end of resistance R 10 is connected with the base stage of triode Q1, the emitter of triode Q1 is connected with GND, and collector electrode is connected with the negative electrode of diode D1, and the anode of diode D1 is connected with one end of resistance R 2.
  5. 5. according to claim 1 a kind ofly based on voltage comparator grid voltage circuit falls; it is characterized in that; it is 8 ± 0.5V that the described first order is protected the scope of voltage in advance; the scope of second level delayed startup voltage is 7.5V~15V; the scope of second level protection voltage is 5 ± 0.1V; the scope of third level delayed startup voltage is 7.5V~15V, and the scope of third level protection shutoff voltage is 0.7 ± 0.05V.
  6. 6. according to claim 4 a kind ofly based on voltage comparator grid voltage circuit falls, it is characterized in that, described resistance R 7, capacitor C 2 with the span of resistance R 9, capacitor C 3 are: t=0.693RC, wherein, t is that previous stage is fallen after grid voltage cell operation to next stage and fallen the delay time of grid voltage unit while starting working, resistance R is the resistance of described resistance R 7 or R9, and capacitor C is the capacitance of described capacitor C 2 or C3, and the power consumption in resistance R 7, resistance R 9 can not surpass its rated disspation.
CN201210109144.1A 2012-04-13 2012-04-13 Voltage comparator-based drop gate voltage circuit CN102629758B (en)

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CN109698611B (en) * 2019-01-23 2021-02-26 东南大学 Multi-stage grid voltage reduction type SiC-MOSFET drive circuit

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