CN205901700U - Active gate pole control circuit - Google Patents

Abstract

The utility model provides an active gate pole control circuit which it includes voltage feedback control circuit unit, active voltage clamp circuit unit, high -speed high gain amplifier unit and gate drive power amplifier unit characterized in that, its superiority: 1, circuit structure is simple, easy to realize that work efficiency is high with stability, 2, switching loss is low, restraines electromagnetic interference, 3, the degree of accuracy is higher, 4, power semiconductor to on -off control has the commonality.

Description

A kind of active gate control circuit

(1) technical field:

This utility model is related to a kind of Electromagnetic Interference Suppressing Techniques of power semiconductor and in particular to a kind of agc (active gate control, abbreviation agc, active gate controls) circuit.

(2) background technology:

With the continuous development of Power Electronic Technique, the effect in modern industry field for the power electronic system is gradually obvious, As motor transmission, electric automobile and the field such as solar energy and wind energy.The continuous expansion of power electronic system application, makes The electromagnetic interference problem obtaining its generation becomes study hotspot.Therefore, Study system emi (electromagnetic Interference, abbreviation emi, electromagnetic interference) suppression technology be very necessary.

Iec (international electrotechnical commission, referred to as, International Electrotechnical Commission) Relevant criterion to the definition of emc (electromagnetic compatibility, abbreviation emc, electromagnetic compatibility) is: system or Equipment can normally run in the electromagnetic environment of its work, and the miscellaneous equipment in same environment is not produced and cannot stand Electromagnetic interference ability.Electromagnetic interference has very big hazardness, on the one hand the normal fortune of impact device, equipment and system OK, greatly shorten its service life；On the other hand may result in misoperation during equipment operation or the fault such as do not work Phenomenon, human body itself also can be affected by electromagnetic radiation, upsets normal life.Early in the forties in last century, American-European countries Just have been proposed that the concept of emc, occur in that the computer-assisted analyses of electromagnetic compatibility the sixties, after the eighties, the U.S., day The country such as basis, Germany obtains compared with overachievement in the simulation and prediction of electromagnetic compatibility and systems design area, develops different rule in a large number The emc analyses and prediction software of mould, has been completed that many experimental researches are worked with analysis modeling, is subsequently based on physical modeling and retouches The method stating emi is developed.The emc relevant criterion of the developed countries such as America and Europe has basic standard, the universal standard, product category Standard etc., iec61000 and cispr (the international special committee on including International Electrotechnical Commission Radio interference, abbreviation cispr, CISPR) series standard, the en of the European Community (european norm, abbreviation en, European standard) series standard, the fcc (federal of FCC Communications commission, abbreviation fcc, US Federal Communication Committee) series standard, North-America standard etc., formed The emc system of complete set.If cispr16 " radio interference and immunity to interference measurement " is basic emission standard；iec6100-4 Series standard is the current perfect immunity to interference basic standard of relative system in the world.

China starts late in terms of emc research, predominantly stays in passive or half active solution electromagnetic interference at present The problem stage.The seventies, some units domestic particularly military products unit encounters electromagnetic compatibility problem in real work, starts Cause extensive attention.Set up national radio interference standard technical committee the eighties, after the nineties, space flight, communication, The departments such as electronics establish a collection of emc experiment test center, have carried out corresponding research in terms of engineering design and forecast analysis And application.For electromagnetic interference emission, the research of 20 century 70 electromagnetic susceptibilities just starts to start to walk.With electromagnetism Compatible develops rapidly, and some domestic R＆D institutions, university have also gradually built up electromagnetic compatibility laboratory, carry out electromagnetic compatibility Detection and the test of certification and electromagnetic environment and evaluation work.

Emc include two aspect content: emi and ems (electromagnetic susceptibility, abbreviation ems, Electromagnetic susceptibility).Emi refers to that electronic equipment produces interference and makes product work performance degradation；Around ems refers to that product can be resisted The ability of equipment interference.The generation of emi will be provided simultaneously with interference source, coupling path and the big key element of sensitive equipment three.Interference source is sent out Go out emi energy, be transmitted on sensitive equipment by coupling path, thus affecting the normal work of sensitive equipment.Electromagnetism is done The source of disturbing is the primary factor considering during research emc problem, but the presence of interference source not necessarily can cause generation electromagnetic interference, I.e. interference source is the essential condition producing emi.Electromagnetic interference source include any can make emi occur components and parts, natural phenomena, Electronic equipment or system etc..According to different conflicting modes, interference source can be divided into outwardly and inwardly interference source.Coupling path is also referred to as Coupling channel is path or the medium of transmission emi.The coupling path of emi has conduction and radiation coupling path.Conduction coupling path Need electromagnetic energy can be connected with there being a circuit loop between sensitive equipment in emi emission source.Connect circuit with power supply, power supply Line, wire, ground plane etc. are communication media, once there being two circuit to be directly connected to return path, will generate Conduction coupling. Radiation coupling path is that interference source carries out the propagation of energy with electromagnetic field pattern, is divided near field and far field CGCM.Sensitivity sets Standby refer to receive the equipment of emi it may also be said to be the equipment that emi is produced with impact.Sensitive equipment is likely to be electronic equipment In certain components and parts, a part or whole electronic equipment.

In power electronic system, conventional device for power switching is igbt, and this is mainly in view of following several advantages: 1) igbt can be used in the environment of high-voltage large current；2) igbt has quick short circuit current disposal ability；3)igbt Belong to voltage-controlled type device, therefore be relatively easy to by the switch motion of gate signal control device.Because device for power switching is fast Form very high du/dt and di/dt during fast on-off action, produce higher hamonic wave, become the master of emi in power electronic system Want interference source.Launch produce pulse incessantly in charge and discharge process to electric capacity or parasitic capacitance under du/dt effect Electric current, can induce certain pulsating volage, be caused by these fluctuating signals when di/dt acts on inductance or stray inductance High-frequency sasser whole system will be caused with extremely serious interference problem.Therefore consider suppression from igbt control strategy angle The technology of system emi is very important, and based on this, proposes a kind of new igbt active gate and controls, by colelctor electrode and Voltage v between emitter stage_ceFeedback network limits voltage overshoot, effectively reduces turn-off power loss, the electromagnetic interference of suppression system.

(3) utility model content:

This utility model purpose is to provide a kind of active gate control circuit, and it solves electromagnetic interference influence system can Decline by property, fault rate increases it is impossible to reach the problem of electromagnetic compatibility standard, be that a kind of circuit structure is simple, easy to operate, business The good structure of industry Utilization prospects, and by the voltage v between collector and emitter_ceFeedback network limits power semiconductor device Part voltage overshoot, you can reach the purpose reducing electromagnetic interference noise.

The technical solution of the utility model: a kind of active gate control circuit, including pwm (pulse width Modulation, abbreviation pwm, pulse width modulation) unit, resistance rb, resistance rg and igbt be it is characterised in that it includes voltage Feedback control circuit unit, active voltage clamp circuit unit, high speed high gain amplifier unit and gate-drive power amplification Device unit；Wherein, described active gate control circuit is connected between igbt gate pole g terminal and colelctor electrode c terminal；Described gate pole drives The input of dynamic Power Amplifier Unit is connected with one end of resistance rb, and its outfan passes through the gate pole g end of resistance rg and igbt Son connects；The other end of described resistance rb receives the voltage signal v from pwm unit_i；Described high speed high gain amplifier unit Input be connected with the outfan of Voltage Feedback control circuit unit, its outfan is connected gate-drive power with resistance rb and puts One end of big device unit connects；The input of described Voltage Feedback control circuit unit is defeated with active voltage clamp circuit unit Go out end to connect, its outfan is connected with the input of high speed high gain amplifier unit；Described active voltage clamp circuit unit Input connect igbt gate pole g terminal.

Described Voltage Feedback control circuit unit by voltage build-up rate feedback module, charge and discharge capacitance c1, diode d2 with And diode d3 composition；Wherein said voltage build-up rate feedback module is by Transient Suppression Diode z2, resistance r2 and discharge and recharge electricity Hold c2 and be serially connected composition；One end of the positive pole connecting resistance r2 of described Transient Suppression Diode z2；The other end of described resistance r2 Connect one end of charge and discharge capacitance c2；The positive pole of another terminating diode d2 of described charge and discharge capacitance c2 and diode d3's is negative Pole；It is in be connected in parallel between described charge and discharge capacitance c1 and Transient Suppression Diode z2, resistance r2.

Described gate-drive Power Amplifier Unit is made up of audion t2 and audion t3；Described audion t2 and three poles Between pipe t3, two base stages are connected, and two emitter stages are connected；The colelctor electrode of described audion t2 connects+15v power supply, and high with high speed Gain amplifier unit connects；The colelctor electrode of described audion t3 connects -15v power supply, and with Voltage Feedback control circuit unit Middle diode d3 positive pole connects.

Described audion t2 is npn audion；Described audion t3 is pnp audion.

Described high speed high gain amplifier unit is made up of resistance r3, resistance r4, transistor t4 and diode d；Described electricity Resistance r3 and resistance r4 series connection；The other end of described resistance r3 is connected with the negative pole of diode d2；The other end of described resistance r4 with One end that resistance rb connects gate-drive Power Amplifier Unit connects；The grid of described transistor t4 is connected resistance with resistance r3 One end of r4 connects, and one end that its source electrode is connected gate-drive Power Amplifier Unit with resistance rb connects, and it drains and gate pole In driving power amplifier unit, the colelctor electrode of audion t2 connects；Described diode d positive pole is connected with the source electrode of transistor t4, Negative pole is connected with the drain electrode of transistor t4.

Described transistor t4 is mosfet (the metal-oxide-semiconductor field-effect of n-channel Transistor, abbreviation mosfet, Metal-Oxide Semiconductor field-effect transistor) transistor.

Described active voltage clamp circuit unit is by Transient Suppression Diode z1, resistance r1 and diode d1 series connection structure Become；The negative pole of described Transient Suppression Diode z1 is connected with the positive pole of Transient Suppression Diode z2, its positive pole and the one of resistance r1 End connects；The other end of described resistance r1 is connected with the positive pole of diode d1；The negative pole of described diode d1 and the gate pole g of igbt Terminal connects.

Described active voltage clamp circuit unit, also includes a voltage source and diode d4；Described diode d4's is negative Pole connects+15v power supply, and its positive pole is connected with the gate pole g terminal of igbt.

Igbt electromagnetic interference suppressing method of the present utility model:

1. input the voltage signal v of pwm unit_i, the colelctor electrode c terminal of igbt is connected with the positive pole of dc bus, is used for The break-make of active gate control circuit；

2. in igbt shutdown moment, gate pole and transmitting voltage across poles v_geIt is in the decline moment, agc active gate controls not yet Work；

Voltage v when between collector and emitter_ceIn the moment beginning to ramp up, agc functions to, collector current i_c1Warp Charge and discharge capacitance c1, charge and discharge capacitance c2 and the Voltage Feedback control circuit unit of diode d2 composition, are able to controls in advance V in igbt turn off process_ceVoltage change ratio dv_ce/dt；

Now, the positive pole of diode d3 is connected with power cathode, and negative pole is equivalent to and is connected on positive source it is therefore prevented that power supply is subject to Damage power supply during the backward voltage of external circuit, play a protective role, collector current i_c1Expression formula as follows:

$i_{c1}=\frac{c_1\×c_2}{c_1+c_2}\·\frac{{\mathrm{dv}}_{ce}}{dt}---\left(1\right)$

3. in igbt turn off process, as gate pole and transmitting voltage across poles v_geRise to v_dc, i.e. Transient Suppression Diode z2 Breakdown voltage, when puncturing Transient Suppression Diode z2, collector current i_c2Through Transient Suppression Diode z2, resistance r2, charge and discharge The Voltage Feedback control circuit unit that electric capacity c2 and diode d2 is constituted, now, due to puncturing of Transient Suppression Diode z2 By charge and discharge capacitance c1 short circuit, collector current i_c2Through resistance r3 and resistance r4, resistance r3 plays metering function, when resistance r4's The sufficiently large i.e. voltage change ratio dv of voltage_ceWhen/dt is sufficiently large, transistor t4 turns on, and reduces gate voltage v_gTo collector current i_cThe impact of the time delay controlling；The gate-drive Power Amplifier Unit being made up of audion t2 and audion t3 is to the door of igbt Pole is recharged, thus ensureing v_geMaintain miller platform, compensate the time delay of active gate control circuit；Current collection now Electrode current i_c2Flow only through charge and discharge capacitance c2, voltage change ratio dv_ce/ dt then reflects the collector current i of igbt_cChange, Due to i_c2Effect, reduce the velocity of discharge of igbt gate pole, therefore collector current rate of change di_c/ dt is also minimized, from And improve v_ceDue to voltage spikes, collector current i_c2Expression formula is as follows:

$i_{c2}=c_2\·\frac{{\mathrm{dv}}_{ce}}{dt}---\left(2\right)$

4. in igbt turn off process, as gate pole and transmitting voltage across poles v_geWhen puncturing Transient Suppression Diode z1, active Voltage clamp circuit unit functions to；The effect of voltage source is to vise gate voltage v_gSo that gate pole surge voltage will not Too high, diode d4 is the electric current that conducting gate pole flows to voltage source, and the electric current to gate pole for the blanking voltage source plays protection igbt's Effect；Gate-drive Power Amplifier Unit is recharged to the gate pole of igbt, thus suppressing igbt collector and emitter Between v_ceDue to voltage spikes；

5. in the case that conventional gate controls and active gate controls, using interference extractor respectively to system dc side The Conduction Interference of both ends of power measures, and obtains phase line l, the electromagnetic interference of center line n mixing interference of DC side both ends of power Contrast frequency spectrum；

6. above-mentioned 5. measured mixing interference is carried out separating, obtain conventional gate control and active gate controls two kinds In the case of common mode disturbances frequency spectrum and differential mode interference frequency spectrum.

Operation principle of the present utility model: the shutoff feedback being structurally characterized in that setting is different of active gate control circuit increases Benefit, in turn off process, voltage build-up rate feedback module is by Transient Suppression Diode z2, charge and discharge capacitance c2 and resistance r2 structure Become, be made up of active voltage clamper electricity Transient Suppression Diode z1, resistance r1 and diode d1 and voltage source and diode d4 Road unit, the high speed high gain amplifier unit being made up of resistance r3, resistance r4, transistor t4 and diode d, by audion t2 Form gate-drive power amplifier with audion t3, gate pole is recharged.The gc of igbt terminates into active gate control Circuit, circuit passes through to control in the different feedback voltage gains of shutdown moment acquisition, suppresses v_ceDue to voltage spikes.This suppressing method is It is connected in system using active gate control circuit, excellent with what stabilivolt clamper controlled by integrated voltage climbing feedback Point, with simple analog element composition control circuit, realizes suppression v_ceDue to voltage spikes, realizes different voltages in turn off process and becomes Rate dv_ce/dt.

Superiority of the present utility model: 1, control circuit is made up of analog element, circuit structure is simple, easily realization, with Prior art is compared, and all increases in terms of work efficiency and stability；2nd, control circuit combine Transient Suppression Diode and Stabilivolt clamper controls, and by obtaining different voltage change ratios when turning off, can effectively suppress collector current and close power-off Pointing peak, reduces the switching loss of voltage, the electromagnetic interference of suppression system simultaneously；3rd, pass through regulation charge and discharge capacitance c1 can control V processed_ceThe rate of rise, charge and discharge capacitance c2 can control v_ceMaximum, even if the stray inductance in circuit is very big, active Gate control circuit can also effectively suppress due to voltage spikes by capacitance value；4th, accuracy is higher, can be by it with now Some driving plates merge, and have the prospect of commercially viable utilization；5th, based on pwm control strategy, for switch The power semiconductor controlling has versatility.

(4) brief description:

Fig. 1 is a kind of circuit structure block diagram of active gate control circuit involved by this utility model.

Fig. 2 is a kind of electrical block diagram of active gate control circuit involved by this utility model.

Fig. 3 is a kind of series circuit principle of simulation schematic diagram of active gate control circuit involved by this utility model.

Fig. 4 is that a kind of igbt electromagnetic interference suppressing method of active gate control circuit involved by this utility model runs emulation Schematic diagram (wherein, simulated conditions are DC voltage 150v, resistance 100 ω, stray inductance 10uh).

Fig. 5 is the emulation of the two igbt series circuit switches processes of same model under Fig. 3 series circuit phantom Voltage waveform.

Fig. 6 is a kind of step 5. middle DC side power supply two of the igbt electromagnetic interference suppressing method of active gate control circuit End phase line l, the mixing interference simulation comparison diagram of center line n.

Fig. 7 is a kind of step 6. middle DC side power supply two of the igbt electromagnetic interference suppressing method of active gate control circuit End common mode disturbances, differential mode interference simulation comparison figure.

Wherein, 1 is high speed high gain amplifier unit；2 is gate-drive Power Amplifier Unit；3 is active electrical pressing tongs Position circuit unit；4 is voltage build-up rate feedback module.

(5) specific embodiment:

Embodiment: a kind of active gate control circuit (see Fig. 1, Fig. 2), including pwm unit, resistance rb, resistance rg and Igbt it is characterised in that it include Voltage Feedback control circuit unit, active voltage clamp circuit unit 3, high speed high-gain are put Big device unit 1 and gate-drive Power Amplifier Unit 2；Wherein, described active gate control circuit is connected on igbt gate pole g terminal And colelctor electrode c terminal between；The input of described gate-drive Power Amplifier Unit 2 is connected with one end of resistance rb, and it is defeated Go out end to be connected with the gate pole g terminal of igbt by resistance rg；The other end of described resistance rb receives the voltage letter from pwm unit Number v_i；The input of described high speed high gain amplifier unit 1 is connected with the outfan of Voltage Feedback control circuit unit, and it is defeated Go out one end connection that end is connected gate-drive Power Amplifier Unit 2 with resistance rb；Described Voltage Feedback control circuit unit Input is connected with the outfan of active voltage clamp circuit unit 3, and its outfan is defeated with high speed high gain amplifier unit 1 Enter end to connect；The input of described active voltage clamp circuit unit 3 connects the gate pole g terminal of igbt.

Described Voltage Feedback control circuit unit (see Fig. 2) by voltage build-up rate feedback module 4, charge and discharge capacitance c1, two Pole pipe d2 and diode d3 composition；Wherein said voltage build-up rate feedback module 4 by Transient Suppression Diode z2, resistance r2 and Charge and discharge capacitance c2 is serially connected composition；One end of the positive pole connecting resistance r2 of described Transient Suppression Diode z2；Described resistance r2 Another termination charge and discharge capacitance c2 one end；The positive pole of another terminating diode d2 of described charge and discharge capacitance c2 and two poles The negative pole of pipe d3；It is in be connected in parallel between described charge and discharge capacitance c1 and Transient Suppression Diode z2, resistance r2.

Described gate-drive Power Amplifier Unit 2 (see Fig. 2) is made up of audion t2 and audion t3；Described audion Between t2 and audion t3, two base stages are connected, and two emitter stages are connected；The colelctor electrode of described audion t2 connects+15v power supply；And And be connected with high speed high gain amplifier unit 1；The colelctor electrode of described audion t3 connects -15v power supply, and with Voltage Feedback control In circuit unit processed, diode d3 positive pole connects.

Described audion t2 is npn audion；Described audion t3 is pnp audion (see Fig. 2).

Described high speed high gain amplifier unit 1 (see Fig. 2) is by resistance r3, resistance r4, transistor t4 and diode d structure Become；Described resistance r3 and resistance r4 series connection；The other end of described resistance r3 is connected with the negative pole of diode d2；Described resistance r4's One end that the other end is connected gate-drive Power Amplifier Unit 2 with resistance rb connects；The grid of described transistor t4 and resistance One end that r3 connects resistance r4 connects, and one end that source electrode is connected gate-drive Power Amplifier Unit 2 with resistance rb connects, drain electrode It is connected with the colelctor electrode of audion t2 in gate-drive Power Amplifier Unit 2；Described diode d positive pole and the source of transistor t4 Pole connects, and negative pole is connected with the drain electrode of transistor t4.

Described transistor t4 is that the mosfet of n-channel manages (see Fig. 2).

Described active voltage clamp circuit unit 3 (see Fig. 2) is by Transient Suppression Diode z1, resistance r1 and diode d1 In series；The negative pole of described Transient Suppression Diode z1 is connected with the positive pole of Transient Suppression Diode z2, its positive pole and resistance One end of r1 connects；The other end of described resistance r1 is connected with the positive pole of diode d1；The negative pole of described diode d1 and igbt Gate pole g terminal connect.

Described active voltage clamp circuit unit 3 also includes a voltage source and diode d4；Described diode d4's is negative Pole connects+15v power supply, and its positive pole is connected with the gate pole g terminal of igbt.

Referring to Fig. 1 and Fig. 2, for high-power switch device igbt, active gate control circuit is set；

Shown in Fig. 2, turn off process is divided into three parts by circuit, using two charge and discharge capacitances and tvs (transient Voltage suppressors, abbreviation tvs, Transient Voltage Suppressor) obtain different feedback oscillators in shutdown moment, and then Play the effect that suppression turns off voltage and controls its rate of rise.In igbt shutdown moment, gate pole and transmitting voltage across poles v_geUnder In the moment of fall, agc not yet works, and works as v_ceThe moment beginning to ramp up, collector current i_c1Flow through charge and discharge capacitance c1 and charge and discharge Electric capacity c2, expression formula is as follows:

$i_{c1}=\frac{c_1\×c_2}{c_1+c_2}\·\frac{{\mathrm{dv}}_{ce}}{dt}---\left(1\right)$

Work as v_geRise to v_dc(i.e. the breakdown voltage of Transient Suppression Diode z2), Transient Suppression Diode z2 is by discharge and recharge Electric capacity c1 short circuit, collector current i now_c2Flow only through charge and discharge capacitance c2, expression formula is as follows:

$i_{c2}=c_2\·\frac{{\mathrm{dv}}_{ce}}{dt}---\left(2\right)$

Fig. 3 is igbt series circuit schematic diagram, DC source u_dc=150v；Load r_load=100 ω；Spuious and parasitism is electric Sense l_s=10uh.Two-way drive signal is+20v, the pulse modulated wave signal of 0v, and its switching frequency is 10khz；Switching device Igbt model is skm75gb063d；Resistance rg is 50 ω.Using lisn (line impedance stabilization Network, abbreviation lisn, line impedance stabilization net work) extract the mixing interference of DC side both ends of power, isolate cm (common mode, abbreviation cm, common mode disturbances) and dm (differential mode, abbreviation dm, differential mode interference).Mode 1 is Two igbt all access the conventional gate control of resistance rg, and mode 2 is that the active gate all accessing agc controls.

Fig. 4 is the simulation architecture schematic diagram under the cascaded structure built under saber simulated environment, and simulated conditions are direct current Voltage 150v, load resistance 100 ω；Spuious and stray inductance 10uh.

Fig. 5 be same model two igbt series circuits under two ways switching process emulation voltage v_ceWaveform. Wherein, v_ce1Line is the voltage waveform under mode 1 conventional gate controls, v_ce2Line is the voltage wave under mode 2 active gate controls Shape.V in the case of access agc as seen from the figure_ceVoltage spikes substantially reduce, and turn off voltage overshoot inhibition good.Card This circuit bright has good inhibitory action to the due to voltage spikes of igbt.And the rise time of voltage increases, reduce shutoff Loss, Active control also can effective suppression electromagnetic interference.

Fig. 6 is DC side both ends of power phase line l, the mixing interference simulation waveform of center line n.Wherein, l1 line is mode 1 tradition Gate pole controls the mixing interference simulation curve of lower DC side both ends of power phase line l, and l2 line is that mode 2 active gate controls lower direct current The mixing interference simulation curve of side both ends of power phase line l；N1 line is that mode 1 conventional gate controls lower DC side both ends of power center line The mixing interference simulation curve of n, n2 line is that mode 2 active gate controls the mixing interference of lower DC side both ends of power center line n imitative True curve.The electromagnetic interference strength of series circuit is larger as seen from the figure, and mixing interference, between 60-120dbuv, has exceeded GB The limit value that gb 9254-2008 specifies, as shown in table 1.Therefore, take the control method of agc to the inhibition of electromagnetic interference relatively Good.

Table 1b class Devices to test power supply terminal conduction interference limit value

Fig. 7 is the cm/dm simulation waveform of DC side both ends of power.Wherein, cm1 line is straight under mode 1 conventional gate controls The common mode disturbances simulation curve of stream side both ends of power, cm2 line is the common mode that mode 2 active gate controls lower DC side both ends of power Interference simulation curve；Dm1 line is the differential mode interference simulation curve that mode 1 conventional gate controls lower DC side both ends of power, dm2 line It is the differential mode interference simulation curve that mode 2 active gate controls lower DC side both ends of power.According to formula (3), with waveform meter Calculate device and be calculated cm/dm waveform, wherein v_r1, v_r2It is respectively the interference voltage value of DC side l, n line.

$v_{cm}=\frac{v_{r1}+v_{r2}}{2}$

Conventional gate controls the waveform cm1 after separating in 30-80dbuv, and dm1 is between 60-110dbuv.Using agc's After control method, common mode disturbances cm2 increased in low-frequency range, more than 2mhz frequency range have dropped 5-20dbuv；Differential mode interference dm2 Have dropped 10-30dbuv in whole frequency range.Therefore, agc method can effectively suppression system common mode/differential mode interference.

Simulation result shows, active control method can reduce the interference of system, in the suppression of low-frequency disturbance (below 1mhz) Effect processed is less, and obvious to the inhibition of High-frequency Interference (more than 1mhz), therefore takes the suppression of active gate control method Effect processed is more preferable.Can apply in various power electronic equipments, significant in engineering practice.

Claims (8)

1. a kind of active gate control circuit, including pwm unit, resistance rb, resistance rg and igbt it is characterised in that it includes electricity Pressure feedback control circuit unit, active voltage clamp circuit unit, high speed high gain amplifier unit and gate-drive power are put Big device unit；Wherein, described active gate control circuit is connected between igbt gate pole g terminal and colelctor electrode c terminal；Described gate pole The input of driving power amplifier unit is connected with one end of resistance rb, and its outfan passes through the gate pole g of resistance rg and igbt Terminal connects；The other end of described resistance rb receives the voltage signal v from pwm unit_i；Described high speed high gain amplifier list The input of unit is connected with the outfan of Voltage Feedback control circuit unit, and its outfan is connected gate-drive power with resistance rb One end of amplifier unit connects；The input of described Voltage Feedback control circuit unit and active voltage clamp circuit unit Outfan connects, and its outfan is connected with the input of high speed high gain amplifier unit；Described active voltage clamp circuit list The input of unit connects the gate pole g terminal of igbt.

2. according to claim 1 a kind of active gate control circuit it is characterised in that described Voltage Feedback control circuit list Unit is made up of voltage build-up rate feedback module, charge and discharge capacitance c1, diode d2 and diode d3；Wherein said voltage rises Rate feedback module is serially connected and is constituted by Transient Suppression Diode z2, resistance r2 and charge and discharge capacitance c2；Described transient state suppression two One end of the positive pole connecting resistance r2 of pole pipe z2；One end of another termination charge and discharge capacitance c2 of described resistance r2；Described discharge and recharge The positive pole of another terminating diode d2 of electric capacity c2 and the negative pole of diode d3；Described charge and discharge capacitance c1 suppresses two with transient state It is in be connected in parallel between pole pipe z2, resistance r2.

3. according to claim 1 a kind of active gate control circuit it is characterised in that described gate-drive power amplifier Unit is made up of audion t2 and audion t3；Between described audion t2 and audion t3, two base stages are connected, two transmittings Extremely connected；The colelctor electrode of described audion t2 connects+15v power supply, and is connected with high speed high gain amplifier unit；Described audion The colelctor electrode of t3 connects -15v power supply, and is connected with diode d3 positive pole in Voltage Feedback control circuit unit.

4. according to claim 3 a kind of active gate control circuit it is characterised in that described audion t2 is npn three pole Pipe；Described audion t3 is pnp audion.

5. according to claim 1 a kind of active gate control circuit it is characterised in that described high speed high gain amplifier list Unit is made up of resistance r3, resistance r4, transistor t4 and diode d；Described resistance r3 and resistance r4 series connection；Described resistance r3's is another One end is connected with the negative pole of diode d2；The other end of described resistance r4 is connected gate-drive Power Amplifier Unit with resistance rb One end connect；One end that the grid of described transistor t4 is connected resistance r4 with resistance r3 connects, and its source electrode is connected with resistance rb One end of gate-drive Power Amplifier Unit connects, the collection of audion t2 in its drain electrode and gate-drive Power Amplifier Unit Electrode connects；Described diode d positive pole is connected with the source electrode of transistor t4, and negative pole is connected with the drain electrode of transistor t4.

6. according to claim 5 a kind of active gate control circuit it is characterised in that described transistor t4 is n-channel Mosfet transistor.

7. according to claim 1 a kind of active gate control circuit it is characterised in that described active voltage clamp circuit list Unit is in series by Transient Suppression Diode z1, resistance r1 and diode d1；The negative pole of described Transient Suppression Diode z1 with The positive pole of Transient Suppression Diode z2 connects, and its positive pole is connected with one end of resistance r1；The other end of described resistance r1 and two poles The positive pole of pipe d1 connects；The negative pole of described diode d1 is connected with the gate pole g terminal of igbt.

8. according to claim 7 a kind of active gate control circuit it is characterised in that described active voltage clamp circuit list Unit, also includes a voltage source and diode d4；The negative pole of described diode d4 connects+15v power supply, the door of its positive pole and igbt Pole g terminal connects.