CN103532365B - A kind of brake unit - Google Patents
A kind of brake unit Download PDFInfo
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- CN103532365B CN103532365B CN201310514614.7A CN201310514614A CN103532365B CN 103532365 B CN103532365 B CN 103532365B CN 201310514614 A CN201310514614 A CN 201310514614A CN 103532365 B CN103532365 B CN 103532365B
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Abstract
The invention discloses a kind of brake unit, comprise bus capacitor (C), the first afterflow module (101), the second afterflow module (102), the first brake module (201), the second brake module (202) and braking resistor (R), described braking resistor (R) is connected in series between described the first brake module (201) and described the second brake module (202). Enforcement the invention has the beneficial effects as follows, clamping action by the first afterflow module and the second afterflow module and braking resistor is connected on to the centre of the first brake module and the second brake module, make brake module in the time of work, can not produce due to voltage spikes, even in the time of a brake module short circuit, still can work on, circuit structure is simple, and security performance is high.
Description
Technical field
The present invention relates to current transformer or frequency converter braking technology field, more particularly, relate to a kind of braking singleUnit.
Background technology
Brake unit be in current transformer or frequency converter motor fast braking or displacement load reliability service very heavyA ring of wanting. In the time of frequency converter speed reducing stopping, motor can be in generating state, in regenerative braking state,The system deceleration time of making shortens greatly, and energy feedback is accelerated greatly, DC bus-bar voltage fast rise, thereforeThis feedback energy must be consumed rapidly, keep DC bus-bar voltage below a certain safe range. BrakingThe major function of unit can consume this energy exactly fast, and energy is fallen apart by braking resistor energy transform into heat energySend out.
Fig. 1 is the block diagram of an existing class brake unit, and Fig. 2 is existing two class brake unitsBlock diagram, includes a brake module 10, afterflow module 20, braking resistor R and a motherLine capacitance C, wherein, brake module 10 comprises a switching tube, this switching tube is insulated gate bipolar crystalPipe, i.e. IGBT, afterflow module 20 is fly-wheel diode. As shown in Figure 1, afterflow module 20 and brakingResistance R all has one end to be connected with positive direct-current bus; As shown in Figure 2, afterflow module 20 and braking resistor RAll there is one end to be connected with negative dc bus.
The operation principle of one class, two class brake unit circuit is roughly the same, and regenerated energy reaches bus setting valueTime, braking IGBT conducting, regenerated energy consumption is on braking resistor R, to reach the object of braking. ButBraking IGBT turn-off time because the impact of stray inductance can produce due to voltage spikes, be easy to by brakingIGBT punctures, and in the time that IGBT is breakdown, braking resistor is always in febrile state, and braking resistorSelect power to be generally 20% of braking power, now braking resistor temperature can be very high and likely burning, drawsPlay fire incident, have very large potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is, for the switching tube in the above-mentioned brake module of prior artIn the time turn-offing, easily produce due to voltage spikes, thereby cause braking resistor excess Temperature and burn, have larger peaceThe defect of full hidden danger, provides a kind of brake unit.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of brake unit, be connected to changeBetween the positive direct-current bus and negative dc bus of stream device or frequency converter, and for realizing current transformer or frequency converterMotor fast braking or displacement load reliability service, described brake unit comprises bus capacitor, the first afterflow mouldPiece, the second afterflow module, the first brake module, the second brake module and braking resistor, and described firstBrake module comprises that the first switching tube, described the second brake module comprise second switch pipe, wherein: described motherLine capacitance is connected between positive direct-current bus and negative dc bus, and described the first afterflow module and described second is openedClosing pipe is connected in series between positive direct-current bus and negative dc bus; Described the first switching tube and described second continuesFlow module is connected in series between positive direct-current bus and negative dc bus; The first end of described braking resistor connectsTie point, second end of described the first afterflow module and described second switch pipe be connected described the first switching tube andThe tie point of described the second afterflow module;
Described brake unit also comprises for according to the Control of Voltage institute between positive direct-current bus and negative dc busState the switch tube driving circuit of the first switching tube and the conducting of described second switch pipe or cut-off, and by described firstDescribed in afterflow module clamper second switch pipe from conducting become due to voltage spikes that when cut-off produces, by described secondThe due to voltage spikes that described in afterflow module clamper, the first switching tube produces in the time that conducting becomes cut-off.
In above-mentioned brake unit, described the first switching tube is the first insulated gate bipolar transistor, describedTwo switching tubes are the second insulated gate bipolar transistor, and described the first afterflow module is the first diode, described inThe second afterflow module is the second diode.
In above-mentioned brake unit, the negative electrode of described the first diode is connected with positive direct-current bus, and described firstThe anode of diode is connected with the colelctor electrode of described the second insulated gate bipolar transistor, described the second insulated gateThe emitter stage of bipolar transistor is connected with negative dc bus, the grid of described the second insulated gate bipolar transistorThe utmost point is connected with described switch tube driving circuit.
In above-mentioned brake unit, the colelctor electrode of described the first insulated gate bipolar transistor and positive direct-current busConnect, the emitter stage of described the first insulated gate bipolar transistor is connected with the negative electrode of described the second diode,The anode of described the second diode is connected with negative dc bus, described braking resistor one end and described the first insulationThe emitter stage of grid bipolar transistor connects, the other end of described braking resistor and described the second insulated gate bipolarThe colelctor electrode of transistor npn npn connects, and the grid of described the first insulated gate bipolar transistor and described switching tube driveMoving circuit connects.
In above-mentioned brake unit, described the first switching tube is the first insulated gate bipolar transistor, describedTwo switching tubes are the second insulated gate bipolar transistor, and described the first afterflow module is with fly-wheel diodeThe 3rd insulated gate bipolar transistor, described the second afterflow module is the 4th insulated gate with fly-wheel diodeBipolar transistor.
In above-mentioned brake unit, the colelctor electrode of described the 3rd insulated gate bipolar transistor and positive direct-current busConnect the emitter stage of described the 3rd insulated gate bipolar transistor and described the second insulated gate bipolar transistorColelctor electrode connect, the grid of described the 3rd insulated gate bipolar transistor with preset the first voltage be connected orPerson is connected with the emitter stage of described the 3rd insulated gate bipolar transistor, described the second insulated gate bipolar crystalThe emitter stage of pipe is connected with negative dc bus, the grid of described the second insulated gate bipolar transistor with described in openPass tube drive circuit connects.
In above-mentioned brake unit, the colelctor electrode of described the first insulated gate bipolar transistor and positive direct-current busConnect the emitter stage of described the first insulated gate bipolar transistor and described the 4th insulated gate bipolar transistorColelctor electrode connect, the emitter stage of described the 4th insulated gate bipolar transistor is connected with negative dc bus, instituteThe grid of stating the 4th insulated gate bipolar transistor be connected with default second voltage or institute described the 4th exhaustedThe emitter stage of edge grid bipolar transistor connects, described braking resistor one end and described the first insulated gate bipolarTransistorized emitter stage connects, the other end of described braking resistor and described the second insulated gate bipolar transistorColelctor electrode connect, the grid of described the first insulated gate bipolar transistor and described switch tube driving circuit companyConnect.
In above-mentioned brake unit, described bus capacitor is electrochemical capacitor or thin-film capacitor.
Implement brake unit of the present invention, there is following beneficial effect: continue by the first afterflow module and secondThe clamping action of flow module and braking resistor is connected on to the centre of the first brake module and the second brake module,Make brake module can not produce due to voltage spikes in the time of work, even in the time of a brake module short circuit, this systemMoving cell still can work on, and circuit structure is simple, and security performance is high.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the block diagram of an existing class brake unit;
Fig. 2 is the block diagram of existing two class brake units;
Fig. 3 is the block diagram of a kind of brake unit of the present invention;
Fig. 4 is the circuit theory diagrams of the first preferred embodiment of a kind of brake unit of the present invention;
Fig. 5 is the circuit theory diagrams of the second preferred embodiment of a kind of brake unit of the present invention.
Detailed description of the invention
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing detailedDescribe bright the specific embodiment of the present invention in detail.
Fig. 3 is the block diagram of a kind of brake unit of the present invention, and this brake unit is for current transformer or frequency conversionMotor fast braking or displacement load reliability service in device, comprise bus capacitor C, the first afterflow module 101,The second afterflow module 102, the first brake module 201, the second brake module 202 and braking resistor R1,The first brake module 201 comprises the first switching tube, and the second brake module 202 comprises second switch pipe. Wherein,Bus capacitor C is connected between positive direct-current bus and negative dc bus, the first afterflow module 101 and secondBrake module 202 is connected in series between positive direct-current bus and negative dc bus, the first brake module 201And second afterflow module 102 be connected in series between positive direct-current bus and negative dc bus, braking resistor RThe first end tie point, the second end that connect the first afterflow module and second switch pipe be connected the first switching tube andThe tie point of the second afterflow module.
Bus capacitor C two ends are connected with frequency converter, utilize the energy storage of electric capacity to be used for eliminating ripple, stableVoltage on dc bus, also plays the effect of some energy storage certainly; In the time that second switch pipe is worked, pass throughThe clamping action of the first afterflow module 101, can prevent that second switch pipe from producing electricity in the time that conducting becomes cut-offPointing peak; In first switching tube when work, can prevent the by the clamping action of the second afterflow module 102One switching tube produces due to voltage spikes in the time that conducting becomes cut-off; This brake unit also comprises for basis honestDescribed in Control of Voltage between stream bus and negative dc bus the first switching tube and the conducting of described second switch pipe orThe switch tube driving circuit (not shown) of cut-off, when the voltage on dc bus is elevated to certain value, theOne switching tube and the conducting of second switch pipe, the voltage drop on dc bus is during to certain value, the first switchPipe and the cut-off of second switch pipe; Braking resistor R in the time of the first switching tube and the conducting of second switch pipe, forThe straight line bus that the consumes frequency converter excess energy that voltage rise produces when high that powers on.
Fig. 4 is the circuit theory diagrams of the first preferred embodiment of a kind of brake unit of the present invention, referring to Fig. 3,Wherein, the first switching tube is the first insulated gate bipolar transistor Q1, and second switch pipe is the second insulated gateBipolar transistor Q2, the first afterflow module 101 is the first diode D1, the second afterflow module 102 isThe second diode D2. Bus capacitor C one end is connected with positive direct-current bus, and the other end and negative dc bus connectConnect, the negative electrode of the first diode D1 is connected with positive direct-current bus, the anode of the first diode D1 and secondThe colelctor electrode of insulated gate bipolar transistor Q2 connects, the transmitting of the second insulated gate bipolar transistor Q2The utmost point is connected with negative dc bus, the grid of the second insulated gate bipolar transistor Q2 and switch tube driving circuitConnect.
The colelctor electrode of the first insulated gate bipolar transistor Q1 is connected with positive direct-current bus, and the first insulated gate is twoThe emitter stage of bipolar transistor Q1 is connected with the negative electrode of the second diode D2, the sun of the second diode D2The utmost point is connected with negative dc bus, the transmitting of braking resistor R one end and the first insulated gate bipolar transistor Q1The utmost point connects, and the other end of braking resistor R is connected with the colelctor electrode of the second insulated gate bipolar transistor Q2,The grid of the first insulated gate bipolar transistor Q1 is connected with switch tube driving circuit.
Fig. 5 is the circuit theory diagrams of a kind of brake unit the second preferred embodiment of the present invention, with the first better realityExecute example different, the first afterflow module 101 can be also the 3rd insulated gate bipolar with fly-wheel diodeTransistor npn npn Q3, the second afterflow module 102 is the 4th insulated gate bipolar crystal with fly-wheel diodePipe Q4. Bus capacitor C is connected between positive direct-current bus and negative dc bus, the 3rd insulated gate bipolarThe colelctor electrode of transistor Q3 is connected with positive direct-current bus, the transmitting of the 3rd insulated gate bipolar transistor Q3The utmost point is connected with the colelctor electrode of the second insulated gate bipolar transistor Q2, the second insulated gate bipolar transistorThe emitter stage of Q2 is connected with negative dc bus, the grid of the second insulated gate bipolar transistor Q2 and switchTube drive circuit connects.
The colelctor electrode of the first insulated gate bipolar transistor Q1 is connected with positive direct-current bus, described the first insulationThe colelctor electrode of the emitter stage of grid bipolar transistor Q1 and described the 4th insulated gate bipolar transistor Q4 connectsConnect, the emitter stage of the 4th insulated gate bipolar transistor Q4 is connected with negative dc bus, braking resistor R mono-End is connected with the emitter stage of the first insulated gate bipolar transistor Q1, the other end of braking resistor R and secondThe colelctor electrode of insulated gate bipolar transistor Q2 connects, the grid of the first insulated gate bipolar transistor Q1Be connected with switch tube driving circuit. Wherein, the grid of the 3rd insulated gate bipolar transistor Q3 can be withThe first default voltage connects, also can be connected with the emitter stage of the 3rd insulated gate bipolar transistor Q3,By self grid and emitter stage short circuit. The grid of the 4th insulated gate bipolar transistor Q4 can be pre-If second voltage connect, also can be connected with the emitter stage of the 4th insulated gate bipolar transistor Q4,By the grid of self and emitter stage short circuit, the first default voltage and default second voltage are fixed value, allFor negative voltage, and satisfied the first default voltage is less than sending out of the 3rd insulated gate bipolar transistor Q3Emitter voltage, default second voltage is less than the emitter voltage of the 4th insulated gate bipolar transistor Q4,Make the conducting of the 3rd insulated gate bipolar transistor Q3 and the 4th insulated gate bipolar transistor Q4 and cutOnly be not subject to the control of grid voltage.
In foregoing circuit, switch tube driving circuit is used for according to the electricity between positive direct-current bus and negative dc busConducting and the cut-off of pressure-controlled the first switching tube and second switch pipe, comprise two kinds of modes, by exporting onePulse signal, or forward conduction voltage of output or oppositely blanking voltage control, switching tube drivesMoving circuit comprises detection loop (not shown) and the control loop (not shown) with its electric connection, logicalCross the voltage detecting on loop detection frequency changer direct current bus, control loop is defeated by detected voltage againGo out a pulse signal that dutycycle is fixing, in the time of high level, control the first insulated gate bipolar transistor Q1With the conducting of the second insulated gate bipolar transistor Q2, in the time of low level, control the first insulated gate bipolar crystalline substanceThe cut-off of body pipe Q1 and the second insulated gate bipolar transistor Q2. Switch tube driving circuit also can basisIts control loop provides by forward conduction voltage of the described Voltage-output measuring or reverse blanking voltageGive the grid of the first insulated gate bipolar transistor Q1 and the grid of the second insulated gate bipolar transistor Q2,Even the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 conducting or cut-off.
In conjunction with Fig. 3 to Fig. 5, existing detailed functions and the operation principle of introducing in detail a kind of brake unit of the present invention:This brake unit is mainly used in the place that current transformer or frequency converter need regenerated energy braking, dc bus in figurePositive pole is connected on the positive pole of frequency converter or current transformer, and dc bus negative pole is connected on the negative pole of current transformer or frequency converter.This brake unit can be used on the differences such as 220V, 380V, 500V, 660V, 690V, 1140V, 1700VIn the direct current or AC system of electric pressure.
In the time that frequency converter or current transformer need run slowly, now the voltage on dc bus can raise, now logicalThe voltage on dc bus is detected in the detection loop of crossing in switch tube driving circuit, and exports by control loopA pulse signal that dutycycle is fixing, in the time of high level, control the first insulated gate bipolar transistor Q1 andThe second insulated gate bipolar transistor Q2 conducting, braking resistor R will consume excess energy, when low level is lowControl the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 cut-off.
Switch tube driving circuit also can be exhausted to first by the voltage between positive direct-current bus and negative dc busThe grid of edge grid bipolar transistor Q1 and the grid of the second insulated gate bipolar transistor Q2 provide forwardConducting voltage or oppositely blanking voltage, detailed process is that the DC bus-bar voltage detecting when detection loop is highIn the time of a predetermined threshold values, forward conduction voltage of control loop output is given the first insulated gate bipolar crystalline substanceThe grid of body pipe Q1 and the grid of the second insulated gate bipolar transistor Q2, the first insulated gate bipolar crystalline substanceBody pipe Q1 and the second insulated gate bipolar transistor Q2 conducting, now DC bus-bar voltage is through dc busPositive pole → first insulated gate bipolar transistor Q1 → braking resistor R → the second insulated gate bipolar transistorQ2 → dc bus negative pole, braking resistor R will consume excess energy.
Consume after a period of time, the lower voltage on dc bus, in the time detecting lower than predetermined threshold values,Now export grid and second insulation of a reverse blanking voltage to the first insulated gate bipolar transistor Q1The grid of grid bipolar transistor Q2, the first insulated gate bipolar transistor Q1 and the second insulated gate bipolarTransistor npn npn Q2 turn-offs. In the time that the first insulated gate bipolar transistor Q1 turn-offs, due to the second diodeThe clamping action of D2 or the 4th insulated gate bipolar transistor Q4 with fly-wheel diode, makes firstThe emitter voltage of insulated gate bipolar transistor Q1 can be lower than one of the voltage on dc bus negative poleThe forward conduction electricity of two diode D2 or the 4th insulated gate bipolar transistor Q4 with fly-wheel diodePress; Simultaneously in the time that the second insulated gate bipolar transistor Q12 turn-offs, equally due to the first diode D2 orPerson, with the clamping action of the 3rd insulated gate bipolar transistor Q3 of fly-wheel diode, makes the second insulationThe collector voltage of grid bipolar transistor Q2 can be higher than one the one or two of the voltage on dc bus positive poleUtmost point pipe D2 or with the forward conduction voltage of the 3rd insulated gate bipolar transistor Q3 of fly-wheel diode,Therefore become by conducting at the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2During for shutoff, there will not be due to voltage spikes, and braking time is short, reliability is high.
In brake unit provided by the invention, can also comprise some circuit protections, if in circuit because of firstWhen insulated gate bipolar transistor in brake module 201 or the second brake module 202 is opened a way, this braking listUnit can not consume regenerated energy, and at this moment, in the time of frequency converter speed reducing stopping, the voltage on dc bus can raise,Now can detect the voltage on dc bus by detecting loop (not shown), when the direct current detectingWhen busbar voltage keeps raising state, now just can carry out overvoltage protection always, close in time frequency converter, makeIt quits work. If in circuit because have one to go out in the first brake module 201 and the second brake module 202When existing short circuit, now this brake unit still can normally be worked by another brake module, braking resistor RStill can consume energy unnecessary on dc bus, detect the voltage at brake module two ends simultaneously by detecting loopJudge whether to be short-circuited, in the time having detected that brake module is short-circuited, can send in time alarm letterNumber, greatly improve the reliability of circuit.
If, because when the first afterflow module 101 or the second afterflow module 102 short circuit, brake unit still in circuitCan normally work, the voltage that simultaneously can detect by detecting loop afterflow module two ends judges whether to occurShort circuit, if detect while having afterflow module to be short-circuited, now brake unit can carry out short-circuit protection, in timeTurn-off the first brake module 201 and the second brake module 202, and frequency converter is quit work. If in circuitBecause when the first afterflow module 101 or the second afterflow module 102 are opened a way, now brake unit still can be normalGround work, consumes the excess energy on dc bus by braking resistor R, but now braking accordinglyModule may be breakdown due to due to voltage spikes, for example in the time that the first afterflow module 101 is opened a way, correspondingThe second brake module 202, because having lacked the clamping action of the first afterflow module 102, is becoming cut-off from conductingShi Keneng occurs that due to voltage spikes is too high and punctures. Therefore now still need by detect loop detect withTurn-off in time brake module and frequency converter is quit work, greatly having reduced the probability breaking down.
Preferably, bus capacitor C is electrochemical capacitor or thin-film capacitor, and capacity is all larger, when bus electricityWhen appearance C is electrochemical capacitor, the positive pole of electrochemical capacitor is connected with dc bus is anodal, the negative pole of electrochemical capacitorBe connected with dc bus negative pole.
Preferably, the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 are alsoBe the IGBT with fly-wheel diode.
Therefore,, in a kind of brake unit provided by the invention, change the circuit topology knot of common brake unitStructure, is connected on braking resistor the centre of the first brake module and the second brake module, and increases by two afterflowsModule, makes circuit in the time of normal work, by the clamping action of two afterflow modules, and the first brake moduleIn the time turn-offing, can not produce due to voltage spikes, the first brake module and the second brake module with the second brake moduleCan be not breakdown, therefore there will not be braking resistor excess Temperature and the situation of burning, security performance is high.
By reference to the accompanying drawings embodiments of the invention are described above, above-mentioned but the present invention is not limited toDetailed description of the invention, above-mentioned detailed description of the invention is only schematically, instead of restrictive, thisThe those of ordinary skill in field, under enlightenment of the present invention, is protected not departing from aim of the present invention and claimIn the scope situation of protecting, also can make a lot of forms, within these all belong to protection of the present invention.
Claims (8)
1. a brake unit, is connected between the positive direct-current bus and negative dc bus of current transformer or frequency converter,And for realizing current transformer or frequency converter motor fast braking or displacement load reliability service, its feature existsIn, described brake unit comprises bus capacitor (C), the first afterflow module (101), the second afterflow module(102), the first brake module (201), the second brake module (202) and braking resistor (R), andDescribed the first brake module (201) comprises that the first switching tube, described the second brake module (202) compriseTwo switching tubes, wherein: described bus capacitor (C) is connected between positive direct-current bus and negative dc bus,Described the first afterflow module (101) and described second switch pipe are connected in series in positive direct-current bus and negative direct currentBetween bus; Described the first switching tube and described the second afterflow module (102) are connected in series in positive direct-current motherBetween line and negative dc bus; The first end of described braking resistor (R) connects described the first afterflow module(101) be connected described the first switching tube and described second with tie point, second end of described second switch pipeThe tie point of afterflow module (102);
Described brake unit also comprises for according to the Control of Voltage institute between positive direct-current bus and negative dc busState the switch tube driving circuit of the first switching tube and the conducting of described second switch pipe or cut-off, and by described firstDescribed in afterflow module (101) clamper second switch pipe from conducting become due to voltage spikes that when cut-off produces, byThe voltage that described in described the second afterflow module (102) clamper, the first switching tube produces in the time that conducting becomes cut-offSpike.
2. brake unit according to claim 1, is characterized in that, described the first switching tube is firstInsulated gate bipolar transistor (Q1), described second switch pipe is the second insulated gate bipolar transistor (Q2),Described the first afterflow module (101) is the first diode (D1), and described the second afterflow module (102) isThe second diode (D2).
3. brake unit according to claim 2, is characterized in that, described the first diode (D1)Negative electrode be connected with positive direct-current bus, the anode of described the first diode (D1) and described the second insulated gateThe colelctor electrode of bipolar transistor (Q2) connects, described the second insulated gate bipolar transistor (Q2)Emitter stage is connected with negative dc bus, the grid of described the second insulated gate bipolar transistor (Q2) and instituteStating switch tube driving circuit connects.
4. brake unit according to claim 3, is characterized in that, described the first insulated gate bipolarThe colelctor electrode of transistor npn npn (Q1) is connected with positive direct-current bus, described the first insulated gate bipolar transistor(Q1) emitter stage is connected with the negative electrode of described the second diode (D2), described the second diode (D2)Anode be connected with negative dc bus, described braking resistor (R) one end and described the first insulated gate bipolarThe emitter stage of transistor (Q1) connects, the other end of described braking resistor (R) and described the second insulated gateThe colelctor electrode of bipolar transistor (Q2) connects, described the first insulated gate bipolar transistor (Q1)Grid is connected with described switch tube driving circuit.
5. brake unit according to claim 1, is characterized in that, described the first switching tube isOne insulated gate bipolar transistor (Q1), described second switch pipe is the second insulated gate bipolar transistor(Q2), described the first afterflow module (101) is the 3rd insulated gate bipolar crystalline substance with fly-wheel diodeBody pipe (Q3), described the second afterflow module (102) is the 4th insulated gate bipolar with fly-wheel diodeTransistor npn npn (Q4).
6. brake unit according to claim 5, is characterized in that, described the 3rd insulated gate bipolarThe colelctor electrode of transistor npn npn (Q3) is connected with positive direct-current bus, described the 3rd insulated gate bipolar transistor(Q3) emitter stage is connected with the colelctor electrode of described the second insulated gate bipolar transistor (Q2), described inThe grid of the 3rd insulated gate bipolar transistor (Q3) is connected with the first default voltage or with described theThe emitter stage of three insulated gate bipolar transistors (Q3) connects, described the second insulated gate bipolar transistor(Q2) emitter stage is connected with negative dc bus, described the second insulated gate bipolar transistor (Q2)Grid is connected with described switch tube driving circuit.
7. brake unit according to claim 6, is characterized in that, described the first insulated gate bipolarThe colelctor electrode of transistor npn npn (Q1) is connected with positive direct-current bus, described the first insulated gate bipolar transistor(Q1) emitter stage is connected with the colelctor electrode of described the 4th insulated gate bipolar transistor (Q4), described inThe emitter stage of the 4th insulated gate bipolar transistor (Q4) is connected with negative dc bus, described the 4th insulationThe grid of grid bipolar transistor (Q4) be connected with default second voltage or with described the 4th insulated gateThe emitter stage of bipolar transistor (Q4) connects, described braking resistor (R) one end and described the first insulationThe emitter stage of grid bipolar transistor (Q1) connects, the other end of described braking resistor (R) and described theThe colelctor electrode of two insulated gate bipolar transistors (Q2) connects, described the first insulated gate bipolar transistor(Q1) grid is connected with described switch tube driving circuit.
8. brake unit according to claim 1, is characterized in that, described bus capacitor (C)For electrochemical capacitor or thin-film capacitor.
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| CN201310514614.7A CN103532365B (en) | 2013-10-25 | 2013-10-25 | A kind of brake unit |
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| CN107707229B (en) * | 2017-09-29 | 2019-10-25 | 广州金升阳科技有限公司 | A kind of DC solid-state relay |
| CN110719045B (en) * | 2019-10-29 | 2021-06-01 | 中车长春轨道客车股份有限公司 | Chopping control system of traction inverter |
| CN112557744A (en) * | 2020-12-11 | 2021-03-26 | 上海新时达电气股份有限公司 | Three-phase current detection method and circuit |
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| CN103208910A (en) * | 2013-05-02 | 2013-07-17 | 北京合康亿盛变频科技股份有限公司 | Dynamic brake device |
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| CN103532365A (en) | 2014-01-22 |
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