CN207819427U

CN207819427U - Overcurrent protective power driving circuit and motor-drive circuit

Info

Publication number: CN207819427U
Application number: CN201721279324.9U
Authority: CN
Inventors: 杨明
Original assignee: Foshan China Micro Electric Technology Co Ltd
Current assignee: Foshan China Micro Electric Technology Co Ltd
Priority date: 2017-10-02
Filing date: 2017-10-02
Publication date: 2018-09-04
Anticipated expiration: 2027-10-02

Abstract

A kind of overcurrent protective power driving circuit; pulse front edge detection unit 101, grid upper arm control circuit 102 and grid vacuum cavitations circuit 104 are defeated by input control pulse; forward position detection makes grid underarm control circuit 103 end; grid upper arm control circuit 102, which exports high level, simultaneously makes power cell 105 that load current be connected, and the power trigger device that feedback unit 106 makes grid underarm control circuit 103, power cell 105 and feedback unit 106 constitute is self-locking in above-mentioned SM set mode；When input pulse low level, the cut-off of grid upper arm control circuit 102, grid vacuum cavitations circuit 104 make gate turn-on negative pressure by grid underarm control circuit 103, so that power cell 105 is ended load current, and so that power trigger device is self-locking in above-mentioned reset state by feedback unit 106；When power tube overcurrent, power tube saturation voltage drop makes the reset of power trigger device by feedback unit and locking, power are in control protection.

Description

Overcurrent protective power driving circuit and motor-drive circuit

Technical field

The utility model belongs to motor control technology field, is related to overcurrent protective power driving circuit and motor driving electricity Road.

Background technology

With the development of industrial technology, the control of motor is required higher and higher.Most of motor is all using electronic control Unit (controller) controls motor, not only to control its start, operating, some also need to accurately control its rotating speed, Torque, power, braking etc..In particular with the raising of international environmental requirement index, using the electric vehicle of clean energy resource, Mini electric vehicle, electro-tricycle, electric two-wheel vehicle future main stream traffic tool are required for using electronic control unit to motor What is optimized accurately controls.

At runtime, safety is all critically important for vehicle asset safety or even personal safety for vehicle.Because of vehicle electrical Machine is in the process of running, harsh along with the fuel factor of electric current, the surge impact of electric current, temperature, vibration, water logging, salt fog etc. Operating condition, motor are easy to various winding failures occur and be easy under the operating modes such as vehicle launch, motor braking, sudden turn of events speed There are various over-current phenomenon avoidances, these excessive rush of current can to machine winding, to electric machine controller, to power supply (battery Deng), prodigious threat is generated to supply line's (such as DC bus), be susceptible to and burn circuit, the work(in breakdown controller Rate pipe, and then can also burn machine winding, damage battery pack, the harm of the biggers such as vehicle freely burning fire even occur, or even jeopardize The life security of personnel.This problem is equally existed for this kind of motor of the other field as used in industrial production quotient.

Therefore, motor, controller manufacturing enterprise and vehicle manufacturer or even the driver and conductor of vehicle pay much attention to motor Operational safety, generally all in electric machine controller be equipped with current foldback circuit, when detect in motor operation occur overcurrent when, Reduce current of electric or shutdown current of electric.

Existing motor over-current detection circuit and current foldback circuit are usually to take to detect in DC bus series current Element, the electric current for detecting DC bus turn off driving pulse or cut-out power supply when overcurrent occurs；Or pass through The series current detecting element in circuitry phase detects the phase current of three-phase windings, when overcurrent occurs, turn off driving pulse or Cut off power supply；It also needs to need to be compared with an a reference value by current measuring element output end signal, works as current detecting When cell output is more than default permissible value, by execution circuit cut off power supply or by cpu stop output driving pulse or Person cuts off driving pulse by execution circuit, occurs to protection act completion to need to undergo in overcurrent：Current detecting-overcurrent compares Judgement-shutdown pulse or power cutoff, wherein the accuracy of current measuring element, stability are during entire vehicle use Very big to the safety effects of overcurrent protection, batch discreteness is also problem, especially an inspection for main line electric current, bus current Survey the generation for often lagging behind overcurrent harm, also the impact of some overcurrents be current-rising-rate it is very big, to final stage in controller It is often fatal harm for power tube, is needed for the protection type of cpu calculating also for the over-current signal of sampling out, The arithmetic speed of cpu will also be such that overcurrent protection action delay executes, and often serious overtemperature just sends out protection to power tube tube core Instruction, greatly reduces controller reliability and service life, in addition breakdown, blow after send out protection instruction.It is now such Current foldback circuit is largely used.

Therefore, in actual use, still there are big amount controller or even machine winding by overcurrent damage.So answering Reliability, the security technique demand of motor-drive technique and electric vehicle industry to overcurrent protection, R ＆ D design go out circuit more Simply, cost is relatively low, directly detection power tube saturation voltage drop of high reliability, passes through strong positive feedback machine again when overcurrent occurs The overcurrent protective power driving circuit for making to shorten actuation time, direct switch-off power tube grid driving pulse is particularly heavy It wants.

Utility model content

The purpose of this utility model is that a kind of overcurrent protective power driving circuit and motor-drive circuit are designed, Power tube saturation voltage drop can directly be detected, actuation time, straight is shortened by strong positive feedback mechanism again when overcurrent occurs On/off power tube gate driving pulse realizes high reliability under the conditions of can be relatively simple, lower-cost in circuit design Overcurrent protection, for solving the problems, such as at least one of above-mentioned technical problem.

According to the utility model in a first aspect, providing a kind of overcurrent protective power driving circuit, special character It is,

Including pulse front edge detection unit 101, grid upper arm control circuit 102, grid underarm control circuit 103, grid Vacuum cavitations circuit 104, power cell 105 and feedback unit 106, wherein：

The pulse front edge detection unit 101 includes input terminal and output end, the input terminal and the overcurrent protective The input terminal in1 connections of power driving circuit,

The grid upper arm control circuit 102 includes input terminal and output end, the input terminal and the overcurrent protective The input terminal in1 connections of power driving circuit,

The grid underarm control circuit 103 include input terminal, grid negative pressure incoming end and output end, the input terminal and The output end of the pulse front edge detection unit 101 connects,

The grid vacuum cavitations circuit 104 include input, output end and grid negative pressure exit, the input terminal and The input terminal in1 connections of the overcurrent protective power driving circuit, the output end and the grid underarm control circuit 103 Input terminal and the output end of the pulse front edge detection unit 101 connect simultaneously, the grid negative pressure exit and the grid The grid negative pressure incoming end of pole underarm control circuit 103 connects,

The power cell 105 includes input, output end and ground terminal, and the input terminal and the grid underarm control The output end of circuit 103 and the output end of the grid upper arm control circuit 102 connect simultaneously, and the ground terminal connects circuit zero Point site (i.e. busbar cathode), the output end of the output end of power cell 105 as the overcurrent protective power driving circuit Electric current for controlling external circuit,

The feedback unit 106 includes input terminal and output end, the output end of the input terminal and the power cell 105 Connection, the output end of the feedback unit is connected with the input terminal of the grid underarm control circuit 103, and the feedback unit 106 constitute the signal positive feedback network between the grid underarm control circuit 103 and power cell 105, make the feedback Member 106 and the grid underarm control circuit 103 and power cell 105 constitute the power D-flip flop having there are two types of stable state,

For,

When the input terminal in1 of the overcurrent protective power driving circuit inputs positive pulse, the pulse front edge Detection unit 101 detects the rising edge of the pulse, makes 103 output end of grid underarm control circuit be in high-impedance state, is described Grid upper arm control circuit 102 exports high level, so that the conducting of the power cell 105 is connected controlled load current, and lead to The SM set mode that the feedback unit 106 makes the power-type trigger be locked at the conducting of the power cell 105 is crossed,

The failing edge of the positive pulse of the input terminal in1 input of the overcurrent protective power driving circuit arrive with And the input terminal, when receiving low level, the grid upper arm control circuit 102 exports high-impedance state, the grid vacuum cavitations Circuit 104 makes the input terminal of the power cell 105 connect described in the order of grid negative pressure by the grid underarm control circuit 103 The load current that power cell 105 ends rapidly, cut-out is controlled, and so that the power-type is touched by the feedback unit 106 Hair device is locked at the reset state of the power cell cut-off,

Between the high period of the positive pulse of the input terminal in1 inputs of the overcurrent protective power driving circuit, When output current overcurrent occurs for the power cell 105, the feedback unit 106 is excessively high by the power cell 105 Saturation voltage drop voltage signal is exported to the input terminal of the grid underarm control circuit 103, makes the grid underarm control circuit 103 drag down rapidly the input terminal voltage of the power cell 105, and are made by the strong feedback effect of the feedback unit 106 The power D-flip flop overturns rapidly and is locked at the reset state of the power cell cut-off, cuts off controlled load electricity Stream, makes the power cell 105 be protected.

Further, the utility model additionally provides a kind of overcurrent protective power driving circuit, is characterized in that, Further include：Upper tube power cell 108 and upper tube Gate control unit 107, the upper tube power cell 108 include input terminal, defeated Outlet and positive terminal, the upper tube Gate control unit 107 include upper tube driving pulse input terminal in22, output end and pumping source Input terminal Vh, wherein

The output end of the upper tube power cell 108 is connected with the output end of the power cell 105, the upper tube power The input terminal of unit 108 is connected with the output end of the upper tube Gate control unit 107, and the positive terminal connects the overcurrent and protects The main power source anode (i.e. busbar anode) of shield type power driving circuit, the pumping source input terminal access are higher than additional power source voltage Pump pressure power supply be used to provide enough gate drive voltages for the upper tube power cell 108, the upper tube driving pulse input End makes the overcurrent protective work(for receiving the drive pulse signal needed for front stage circuits output end upper tube power cell 108 Rate driving circuit can realize that low and high level bipolar power drives.

It is further preferred that the utility model provides a kind of overcurrent protective power driving circuit, special character exists In including input capacitance C1, transistor Q1, resistance R1 and diode D1 including, the pulse front edge detection unit 101, wherein： It is driven as the input terminal of the pulse front edge detection unit 101 and the overcurrent protective power one end of the input capacitance C1 One end of the input terminal in1 connections of dynamic circuit, the other end of the input capacitance C1 and the resistance R1, the diode D1 Cathode, the transistor Q1 base stage connect simultaneously, the other end of the resistance R1 and the anode of diode D1, triode Q1 Emitter is grounded simultaneously, the output end of the collector of the triode Q1 as the pulse front edge detection unit 101,

The grid upper arm control circuit 102 includes transistor Q2, Q3, Q4 and resistance R2, R3, R4, the transistor Q2 Emitter ground connection, resistance R2 one end connect the transistor Q2 base stages, resistance R2 the other end as the grid upper arm The input terminal of control circuit is connected with the input terminal in1 of the overcurrent protective power driving circuit, the collector of transistor Q2 It is connected simultaneously by the collector pole of the resistance R3 and transistor Q3 and the base stage of the transistor Q4, the crystal The emitter of the emitter of pipe Q3 and the transistor Q4 are connect with the grid supply voltage end of circuit simultaneously, the transistor Q3 Base stage connected with the collector of the transistor Q4 by resistance R4 and be used as the output of the grid upper arm control circuit 102 End,

The grid underarm control circuit 103 includes transistor Q5, diode D4 and diode D5, the transistor Q5's The anode of emitter and the diode D5 are connected to the grid negative pressure incoming end of the grid underarm control circuit 103, institute State the cathode ground connection of diode D5, the anode of the base stage connection diode D4 of the transistor Q5, the cathode of the diode D4 Input terminal as the grid underarm control circuit 103 is connected with the output end of the pulse front edge detection unit 101, described Output end and the grid upper arm control circuit 102 of the collector of transistor Q5 as the grid underarm control circuit 103 Output end connection,

The grid vacuum cavitations circuit 104 includes transistor Q6, Q7 and diode D3, resistance R6, R7, R8, transistor The grid supply voltage end of the emitter connection circuit of Q7, one end of the base stage connection resistance R6 of the transistor Q7, resistance R6 The other end as the grid vacuum cavitations circuit 104 input terminal and the overcurrent protective power driving circuit input In1 connections, the grid negative pressure feeder ear of the emitter connection circuit of the transistor Q6, the base stage of the transistor Q6 is held to pass through The collector of resistance R8 and the transistor Q7, the resistance R7 one end connect simultaneously, the connection of the other end of the resistance R7 Output end and institute of the cathode of positive, the described diode D3 of the diode D3 as the grid vacuum cavitations circuit 104 The input terminal connection of the grid underarm control circuit 103 is stated, the collector of the transistor Q6 is as the grid negative pressure control The grid negative pressure exit of circuit 104 processed is connect with the grid negative pressure incoming end of the grid underarm control circuit 103,

The power cell 105 includes that the grid of igbt Q8, the igbt Q8 are made For the output end and grid upper arm control electricity of 105 input terminal of the power cell and the grid underarm control circuit 103 The output end on road 102 connects simultaneously, the ground terminal of the transmitting extremely power cell 105 of the igbt Q8 It connects circuit zero site (i.e. busbar cathode), the current collection of the igbt Q8 extremely power cell 105 And the output end of the overcurrent protective power driving circuit is used to control the electric current of external circuit,

The feedback unit 106 includes diode D2 and resistance R5, and the cathode of the diode D2 is as the feedback First 106 input terminals are connected with the output end of the power cell 105, and the anode of the diode D2 is as the feedback unit 106 output ends are connected with the input terminal of the grid underarm control circuit 103, and the resistance R5 is being connected to the diode D2 just The grid voltage feeder ear of pole and circuit makes the feedback unit 106 constitute the grid underarm control circuit 103 and power list Signal positive feedback network between member 105, the feedback unit 106 and the grid underarm control circuit 103 and power cell 105 constitute the power D-flip flop having there are two types of stable state,

For,

It is further preferred that the utility model provides a kind of overcurrent protective power driving circuit, special character exists In including,

The pulse front edge detection unit 101 includes input capacitance C1, transistor Q1, resistance R1 and diode D1, wherein： It is driven as the input terminal of the pulse front edge detection unit 101 and the overcurrent protective power one end of the input capacitance C1 One end of the input terminal in1 connections of dynamic circuit, the other end of the input capacitance C1 and the resistance R1, the diode D1 Cathode, the transistor Q1 base stage connect simultaneously, the other end of the resistance R1 and the anode of diode D1, triode Q1 Emitter is grounded simultaneously, the output end of the collector of the triode Q1 as the pulse front edge detection unit 101,

The upper tube power cell 108 includes igbt Q9, the grid of the igbt Q9 The input terminal of the extremely upper tube power cell 108 is connected with the output end of the upper tube Gate control unit 107, the insulation Output of the emitter of grid bipolar transistor Q9 as the output end and the power cell 105 of the upper tube power cell 108 End connection, described in the positive terminal connection of the collector of the igbt Q9 as the upper tube power cell 108 The main power source anode (i.e. busbar anode) of overcurrent protective power driving circuit,

The upper tube Gate control unit 107 includes upper tube driving pulse input terminal in22, output end and pumping source input Vh, the pumping source input terminal access is held to be used to be the upper tube power cell 108 higher than the pump pressure power supply of additional power source voltage Enough gate drive voltages are provided, the upper tube driving pulse input terminal is for receiving front stage circuits output end upper tube power cell Drive pulse signal needed for 108 enables the overcurrent protective power driving circuit to realize low and high level bipolar power Driving,

For,

According to the second aspect of the utility model, a kind of motor-drive circuit is provided, is characterized in that, including this Overcurrent protective power driving circuit described in utility model first aspect.

It is further preferred that the utility model additionally provides a kind of motor-drive circuit, it is characterized in that including three A overcurrent protective power driving circuit forms the 3 stage overcurrent protection type power drive electricity for driving three phase electric machine Road, the 3 stage overcurrent protection type power driving circuit are the first phase overcurrent protective power driving circuit, the second phase overcurrent guarantor Shield type power driving circuit and third phase overcurrent protective power driving circuit drive in the overcurrent protective power of each phase Between the high period of the positive pulse of the input terminal in1 inputs of dynamic circuit, when output current overcurrent occurs for the one after another unit, The phase overcurrent protective power driving circuit cuts off controlled load current, and the power cell is made to be protected.

According to the third aspect of the utility model, a kind of motor-drive circuit is provided, is characterized in that, including the Overcurrent protective power driving circuit described in one side.

Further, foregoing power cell or upper tube power cell, are characterized in that, the power cell Or upper tube power cell is IGBT or MOSFET.

The utility model has the beneficial effects that：Circuit design is relatively simple, cost is relatively low, is guaranteed adequate food using direct detection power Actuation time, the driving of direct switch-off power tube grid are shortened by strong positive feedback mechanism again with pressure drop, when overcurrent occurs Pulse makes overcurrent protective power driving circuit have higher reliability, to meet motor-drive technique and electric vehicle industry Reliability, security technique demand to overcurrent protection.

Description of the drawings

Fig. 1 is a kind of block diagram for overcurrent protective power driving circuit that the utility model embodiment is provided.

Fig. 2 is that a kind of circuit structure for overcurrent protective power driving circuit that the utility model embodiment is provided shows It is intended to.

Fig. 3 is a kind of overcurrent protective work(including upper tube and its control circuit that the utility model embodiment is provided The block diagram of rate driving circuit.

Fig. 4 is a kind of overcurrent protective work(including upper tube and its control circuit that the utility model embodiment is provided The electrical block diagram of rate driving circuit.

Fig. 5 is a kind of box for the driving three phase electric machine driving circuit of cold end that the utility model embodiment is provided Figure.

Fig. 6 is a kind of cold end overcurrent protection including upper tube and its control circuit that the utility model embodiment is provided The block diagram of type three phase electric machine driving circuit.

Specific implementation mode

In a first aspect, the utility model provides a kind of overcurrent protective power driving circuit, such as following embodiments 1 and in fact Example 2 is applied to be described in further detail.

Embodiment 1

As shown in Figure 1, being a kind of side for overcurrent protective power driving circuit that the utility model embodiment is provided Block diagram.

Present embodiments provide a kind of overcurrent protective power driving circuit, including pulse front edge detection unit 101, grid Upper arm control circuit 102, grid underarm control circuit 103, grid vacuum cavitations circuit 104, power cell 105 and feedback unit 106, wherein：

Pulse front edge detection unit 101 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in1 connections,

Grid upper arm control circuit 102 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in1 connections,

Grid underarm control circuit 103 includes input terminal, grid negative pressure incoming end and output end, before input terminal and pulse Output end along detection unit 101 connects,

Grid vacuum cavitations circuit 104 includes input, output end and grid negative pressure exit, input terminal and overcurrent protection The input terminal and pulse front edge of the input terminal in1 connections of type power driving circuit, output end and grid underarm control circuit 103 are examined Go out the output end of unit 101 while connecting, the grid negative pressure incoming end of grid negative pressure exit and grid underarm control circuit 103 Connection,

Power cell 105 includes input, output end and ground terminal, input terminal and grid underarm control circuit 103 it is defeated The output end of outlet and grid upper arm control circuit 102 connects simultaneously, and ground terminal connects circuit zero site (i.e. busbar cathode), The output end of power cell 105 is used to control the electric current of external circuit as the output end of overcurrent protective power driving circuit,

Feedback unit 106 includes input terminal and output end, and input terminal is connected with the output end of power cell 105, feedback The output end of member is connected with the input terminal of grid underarm control circuit 103, and feedback unit 106 constitutes grid underarm control circuit Signal positive feedback network between 103 and power cell 105 makes feedback unit 106 and grid underarm control circuit 103 and power Unit 105 constitutes the power D-flip flop having there are two types of stable state,

For,

When the input terminal in1 of overcurrent protective power driving circuit inputs positive pulse, pulse front edge detection unit The rising edge of 101 detection pulses, keeps 103 output end of grid underarm control circuit defeated in high-impedance state, grid upper arm control circuit 102 Go out high level, so that the conducting of power cell 105 is connected controlled load current, and so that power-type is triggered by feedback unit 106 Device is locked at the SM set mode of the conducting of power cell 105,

It arrives and defeated in the failing edge of the positive pulse of the input terminal in1 input of overcurrent protective power driving circuit When entering termination and receiving low level, grid upper arm control circuit 102 exports high-impedance state, grid vacuum cavitations circuit 104 passes through grid Underarm control circuit 103 makes the input terminal connection grid negative pressure of power cell 105 enable power cell 105 cut-off, cut-out institute rapidly The load current of control, and so that power-type trigger is locked at the reset state that power cell ends by feedback unit 106,

Between the high period of the positive pulse of the input terminal in1 inputs of overcurrent protective power driving circuit, work as work( When output current overcurrent occurs for rate unit 105, feedback unit 106 is by the excessively high saturation voltage drop voltage signal of power cell 105 It exports to the input terminal of grid underarm control circuit 103, grid underarm control circuit 103 is made to drag down power cell 105 rapidly Input terminal voltage, and so that power D-flip flop is overturn rapidly by the strong feedback effect of feedback unit 106 and be locked at power The controlled load current of the reset state of unit cut-off, cut-out, makes power cell 105 be protected.

As shown in Fig. 2, being a kind of electricity for overcurrent protective power driving circuit that the utility model embodiment is provided Line structure schematic diagram.

Fig. 2 is a kind of circuit structure schematic diagram of overcurrent protective power driving circuit shown in Fig. 1 block diagrams, wherein arteries and veins It rushes forward position detection unit 101 and includes input capacitance C1, transistor Q1, resistance R1 and diode D1, wherein：The one of input capacitance C1 End is connected as the input terminal of pulse front edge detection unit 101 with the input terminal in1 of overcurrent protective power driving circuit, is inputted The other end of capacitance C1 and one end of resistance R1, the cathode of diode D1, transistor Q1 base stage connect simultaneously, resistance R1's is another One end is grounded simultaneously with the anode of diode D1, the emitter of triode Q1, and the collector of triode Q1 is examined as pulse front edge Go out the output end of unit 101,

Grid upper arm control circuit 102 includes transistor Q2, Q3, Q4 and resistance R2, R3, R4, the emitter of transistor Q2 It is grounded, input terminal of the other end of one end of resistance R2 connection transistor Q2 base stages, resistance R2 as grid upper arm control circuit It is connected with the input terminal in1 of overcurrent protective power driving circuit, the collector of transistor Q2 passes through resistance R3 and transistor Q3 Collector pole and the base stage of transistor Q4 connect simultaneously, the emitter of transistor Q3 and the emitter of transistor Q4 simultaneously with The grid supply voltage end of circuit connects, and the base stage of transistor Q3 is connected and is used as with the collector of transistor Q4 by resistance R4 The output end of grid upper arm control circuit 102,

Grid underarm control circuit 103 include transistor Q5, diode D4 and diode D5, the emitter of transistor Q5 and The anode of diode D5 is connected to the grid negative pressure incoming end of grid underarm control circuit 103, and the cathode of diode D5 is grounded, The anode of the base stage connection diode D4 of transistor Q5, the input of the cathode of diode D4 as grid underarm control circuit 103 End is connected with the output end of pulse front edge detection unit 101, and the collector of transistor Q5 is as grid underarm control circuit 103 Output end is connected with the output end of grid upper arm control circuit 102,

Grid vacuum cavitations circuit 104 includes transistor Q6, Q7 and diode D3, resistance R6, R7, R8, transistor Q7's Emitter connects the grid supply voltage end of circuit, one end of the base stage connection resistance R6 of transistor Q7, the other end of resistance R6 It is connect with the input terminal in1 of overcurrent protective power driving circuit as the input terminal of grid vacuum cavitations circuit 104, transistor The grid negative pressure feeder ear of the emitter connection circuit of Q6, the current collection that the base stage of transistor Q6 passes through resistance R8 and transistor Q7 Pole, resistance R7 one end connect simultaneously, the anode of the other end of resistance R7 connection diode D3, the cathode of diode D3 are as grid The output end of pole vacuum cavitations circuit 104 is connect with the input terminal of grid underarm control circuit 103, and the collector of transistor Q6 is made Connect for the grid negative pressure exit of grid vacuum cavitations circuit 104 and the grid negative pressure incoming end of grid underarm control circuit 103 It connects,

Power cell 105 includes igbt Q8, and the grid of igbt Q8 is as power list First 105 input terminals and the output end of grid underarm control circuit 103 and the output end of grid upper arm control circuit 102 connect simultaneously It connects, (i.e. busbar is negative in the ground terminal connection circuit zero site of the transmitting extremely power cell 105 of igbt Q8 Pole), the current collection extremely output end of power cell 105 and overcurrent protective power driving circuit of igbt Q8 is used In the electric current of control external circuit, in order to illustrate succinct, only necessary circuit element connection relation is explained in embodiment It states, for fly-wheel diode in parallel on the common power tube of known technology and the over-pressed amplitude limit connect in power tube grid Protection zener diode is not shown herein.

Feedback unit 106 includes diode D2 and resistance R5, the cathode of diode D2 as 106 input terminal of feedback unit with It is connected with the output end of power cell 105, the anode of diode D2 is as 106 output end of feedback unit and grid underarm control electricity The input terminal on road 103 connects, and resistance R5 is connected to the grid voltage feeder ear of diode D2 anodes and circuit, makes feedback unit 106 constitute the signal positive feedback network between grid underarm control circuit 103 and power cell 105, feedback unit 106 and grid Underarm control circuit 103 and power cell 105 constitute the power D-flip flop having there are two types of stable state,

For,

Fig. 2 circuit courses of work are described below：

The in1 of circuit is to receive front stage circuits output end to control pulse, and the control pulse is effective for high level, that is, in height When level the output end out of entire circuit can be connected over the ground, to connect the current path of controlled member.

When input pulse forward position is arrived, high potential makes transistor Q7 end and then makes transistor Q6 cut-offs, diode D3 Cut-off, such 104 each terminal of grid vacuum cavitations circuit are presented high-impedance state, do not act on the rest part of entire circuit.

Meanwhile when input pulse arrival, emitter junction and resistance R1 by transistor Q1 are capacitance C1 chargings, make transistor Q1 conductings, the transistor Q5 cut-offs for dragging down diode D4 cathode potentials, making grid underarm control circuit 103, capacitance C1 fill rapidly Foot electricity, transistor Q1 become ending.

Input pulse forward position also by resistance R2 make transistor Q2 conductings, by make transistor Q2 pass through resistance R3 connect it is brilliant Body pipe Q4 base currents make transistor Q4 conductings, provide grid voltage (in figure by taking+15v as an example), crystal for power transistor Q8 Pipe Q8 conductings, connection is connected to the load current path between the out of circuit output and busbar anode, and (busbar anode and load are not Give and showing), power transistor Q8 can be field-effect tube or insulated gate bipolar transistor IGBT.

During power transistor Q8 conductings, clamp voltage is fed back to by grid underarm control electricity by diode D2 clampers The input terminal on road 103, the anodic potentials UD2 ＜ UD5+UD4+UQ5be for making diode D2, wherein：UD5 is the forward direction of diode D5 On state threshold voltage, UD4 are the reverse turn-on voltages of zener diode D4, the emitter conduction threshold that UQ5be is transistor Q5 Voltage, so transistor Q5 cut-offs, above-mentioned power transistor Q8 conducting states are locked up, this state is stable state.

During the high level of input pulse continues, power transistor Q8 constant conductions maintain above-mentioned stable state.

Along when arriving after input pulse, capacitance C1 electric discharges, charging when arriving for next pulse forward position is prepared.

Between input pulse low period, transistor Q7 conductings make transistor Q5 be connected by resistance R7, diode D3, D5, Transistor Q7 conductings simultaneously also make transistor Q6 be connected by resistance R8, and power tube Q8 grid potentials are dragged down jointly with transistor Q5 Transistor Q3 conductings, closing crystal are made by resistance R4 simultaneously to " grid negative pressure " (in figure by taking -5v as an example), transistor Q5 conductings The emitter voltage of pipe Q4 makes transistor Q4 cut-offs (can be concatenated when necessary in transistor Q4 collector loops or emitter circuit Current-limiting resistance is not shown with preventing transistor Q4 conductings synchronous with Q5 in figure), i.e.,:The cut-off of grid upper arm control circuit 102, Grid underarm control circuit 103 is connected, and so that the collector potential of power tube Q8 is further increased, again by the positive and negative of diode D2 Feedback effect makes power tube Q8 end rapidly, rupturing duty pipe and load current, hereafter：The output end out voltages of circuit are due to negative Current vanishes are carried to be pulled to busbar anodic potentials, diode D2 cut-offs, grid power supply+15v is made to pass through resistance R5 and maintain Transistor Q5 conductings, such power transistor Q8 cut-off states are locked up, this state is stable state.

During the high level of input pulse continues, if leading to power transistor Q8 overcurrents due to load short circuits etc. When, its collector (being drain electrode when according to mosfet) voltage synchronized with overcurrent rise, by diode D2 by collector voltage Feed back to the input terminal of grid underarm control circuit 103, when the anodic potentials of diode D2 ought be increased to UD2 >=UD5+UD4+ When UQ5be, diode D4, transistor Q5, diode D5 conductings, drags down power tube Q8 grid potentials while being made by resistance R4 Transistor Q3 conductings, the emitter voltage for closing transistor Q4, make transistor Q4 cut-offs (also can be in transistor Q4 collector series connections Appropriate resistance is endangered with preventing transistor Q4 conductings synchronous with Q5, is not shown in figure), i.e.,:Grid upper arm control circuit 102 is cut Only, grid underarm control circuit 103 is connected, and so that the collector potential of power tube Q8 is further increased, again by diode D2's Positive feedback effect makes power tube Q8 end rapidly, rupturing duty pipe and load current, hereafter：The output end out voltages of circuit by It is pulled to busbar anodic potentials in load current disappearance, diode D2 cut-offs, grid power supply+15v is made to pass through resistance R5 Transistor Q5 conductings, such power transistor Q8 cut-off states is maintained to be locked up, this state is stable state.

Before the high level of input pulse next time arrives, above-mentioned stable state is maintained.Power tube and load is set to be protected. In addition, in order to improve circuit response, can also the series circuit that a resistance and a capacitance are constituted be connected to transistor Between Q6 base stages and transistor Q5 collectors, current direction is directed toward transistor Q5 collectors, can make overcurrent protection state in this way The grid voltage of transistor Q8 be self-locking in negative pressure.

In order to illustrate it is concise, only necessary circuit element connection relation is illustrated in embodiment, for It is common such as electric power generation unloading resistance in parallel on portion of transistor emitter and in transistor collector or emitter in known technology Current-limiting resistance, negative feedback resistor for being concatenated etc. repeat no more herein, attached drawing is also not shown.

The circuit is due to use hardware circuit and integrated circuit is relatively simple, makes overcurrent protection pole by positive feedback path It is rapid, and the reliability of circuit is very high.

Embodiment 2

As shown in figure 3, being a kind of overcurrent including upper tube and its control circuit that the utility model embodiment is provided The block diagram of protection type power driving circuit.

The utility model additionally provides a kind of overcurrent protective power driving circuit, further includes：108 He of upper tube power cell Upper tube Gate control unit 107, upper tube power cell 108 include input, output end and positive terminal, upper tube Gate control unit 107 include upper tube driving pulse input terminal in22, output end and pumping source input terminal Vh, wherein

The output end of upper tube power cell 108 is connected with the output end of power cell 105, upper tube power cell 108 it is defeated Enter end to connect with the output end of upper tube Gate control unit 107, positive terminal connects the main electricity of overcurrent protective power driving circuit Source anode (i.e. busbar anode), the access of pumping source input terminal is used to be upper tube power list higher than the pump pressure power supply of additional power source voltage Member 108 provides enough gate drive voltages, and upper tube driving pulse input terminal is for receiving tube power list on front stage circuits output end Drive pulse signal needed for member 108 enables overcurrent protective power driving circuit to realize that low and high level bipolar power drives It is dynamic.

As shown in figure 4, being a kind of overcurrent including upper tube and its control circuit that the utility model embodiment is provided The electrical block diagram of protection type power driving circuit.

The utility model additionally provides a kind of overcurrent protective power driving circuit, including：

Pulse front edge detection unit 101 includes input capacitance C1, transistor Q1, resistance R1 and diode D1, wherein：Input Input terminal of the one end of capacitance C1 as the input terminal and overcurrent protective power driving circuit of pulse front edge detection unit 101 In1 connections, the other end of input capacitance C1 and one end of resistance R1, the cathode of diode D1, transistor Q1 base stage connect simultaneously It connects, the other end of resistance R1 and the emitter of the anode of diode D1, triode Q1 are grounded simultaneously, and the collector of triode Q1 is made For the output end of pulse front edge detection unit 101,

Power cell 105 includes igbt Q8, and the grid of igbt Q8 is as power list First 105 input terminals and the output end of grid underarm control circuit 103 and the output end of grid upper arm control circuit 102 connect simultaneously It connects, (i.e. busbar is negative in the ground terminal connection circuit zero site of the transmitting extremely power cell 105 of igbt Q8 Pole), the current collection extremely output end of power cell 105 and overcurrent protective power driving circuit of igbt Q8 is used In control external circuit electric current,

Upper tube power cell 108 includes igbt Q9, and the grid of igbt Q9 is upper tube 2. the input terminal of power cell 108 and the output end of upper tube Gate control unit 107 connect, the hair of igbt Q9 Emitter-base bandgap grading as upper tube power cell 108 output end and power cell 105 output end connection, also with upper tube Gate control unit 3. 107 emitter voltage leading-in end connects, the anode of the collector of igbt Q9 as upper tube power cell 108 The main power source anode (i.e. busbar anode) of end connection overcurrent protective power driving circuit,

Upper tube Gate control unit 107 includes that 1. (in22), output end are 2. defeated with pumping source for upper tube driving pulse input terminal Enter end 6. (Vh), the access of pumping source input terminal is used to be upper tube power cell higher than the pump pressure power supply (Vh) of additional power source voltage 108 provide enough gate drive voltages, and upper tube driving pulse input terminal is for receiving front stage circuits output end upper tube power cell Drive pulse signal needed for 108 enables overcurrent protective power driving circuit to realize that low and high level bipolar power drives, And upper tube Gate control unit 107 also with well-known custom circuit low-voltage power supply end 5. (by taking+15v as an example, The present embodiment can with " the grid supply voltage " of transistor Q8 above-mentioned be same voltage source), ground terminal 4..

For,

Wherein main body circuit part is identical as earlier figures 2, repeats no more, this circuit is increased on circuit base shown in Fig. 2 Upper tube power cell 108 and upper tube Gate control unit 107 are added, it can be readily appreciated that upper tube Q9 and down tube Q8 can be each From the control of prime driving pulse under, constitute double-polarity control, high potential exported when upper tube Q9 conducting, down tube Q8 cut-offs, when Low potential is exported when upper tube Q9 cut-offs, down tube Q8 conductings.

Second aspect, the utility model provide a kind of motor-drive circuit, include the mistake of the utility model first aspect Flow protection type power driving circuit.

Embodiment 3

As shown in figure 5, the three phase electric machine driving circuit that this cold end that is provided of the utility model embodiment is driving (500), 3 stage overcurrent protection type power driving circuit including three overcurrent protective power driving circuits, is formed,

3 stage overcurrent protection type power driving circuit is the first phase overcurrent protective power driving circuit, the second phase overcurrent guarantor Shield type power driving circuit and third phase overcurrent protective power driving circuit, wherein：

First phase overcurrent protective power driving circuit includes pulse front edge detection unit 101, grid upper arm control circuit 102, grid underarm control circuit 103, grid vacuum cavitations circuit 104, power cell 105 and feedback unit 106, wherein：

Grid underarm control circuit 103 includes input terminal, grid negative pressure incoming end and output end, input terminal and pulse front edge The output end of detection unit 101 connects,

In this way, when the input terminal in1 of overcurrent protective power driving circuit inputs positive pulse, pulse front edge detection Unit 101 detects the rising edge of pulse, makes 103 output end of grid underarm control circuit in high-impedance state, grid upper arm control circuit 102 output high level, make the conducting of power cell 105 connect controlled load current, and make power-type by feedback unit 106 Trigger is locked at the SM set mode of the conducting of power cell 105,

Between the high period of the positive pulse of the input terminal in1 inputs of overcurrent protective power driving circuit, work as work( When output current overcurrent occurs for rate unit 105, feedback unit 106 is by the excessively high saturation voltage drop voltage signal of power cell 105 It exports to the input terminal of grid underarm control circuit 103, grid underarm control circuit 103 is made to drag down power cell 105 rapidly Input terminal voltage, and so that power D-flip flop is overturn rapidly by the strong feedback effect of feedback unit 106 and be locked at power The controlled load current of the reset state of unit cut-off, cut-out, makes power cell 105 be protected；

Second phase overcurrent protective power driving circuit includes pulse front edge detection unit 201, grid upper arm control circuit 202, grid underarm control circuit 203, grid vacuum cavitations circuit 204, power cell 205 and feedback unit 206, wherein：

Pulse front edge detection unit 201 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in2 connections,

Grid upper arm control circuit 202 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in2 connections,

Grid underarm control circuit 203 includes input terminal, grid negative pressure incoming end and output end, input terminal and pulse front edge The output end of detection unit 201 connects,

Grid vacuum cavitations circuit 204 includes input, output end and grid negative pressure exit, input terminal and overcurrent protection The input terminal and pulse front edge of the input terminal in2 connections of type power driving circuit, output end and grid underarm control circuit 203 are examined Go out the output end of unit 201 while connecting, the grid negative pressure incoming end of grid negative pressure exit and grid underarm control circuit 203 Connection,

Power cell 205 includes input, output end and ground terminal, input terminal and grid underarm control circuit 203 it is defeated The output end of outlet and grid upper arm control circuit 202 connects simultaneously, and ground terminal connects circuit zero site (i.e. busbar cathode), The output end of power cell 205 is used to control the electric current of external circuit as the output end of overcurrent protective power driving circuit,

Feedback unit 206 includes input terminal and output end, and input terminal is connected with the output end of power cell 205, feedback The output end of member is connected with the input terminal of grid underarm control circuit 203, and feedback unit 206 constitutes grid underarm control circuit Signal positive feedback network between 203 and power cell 205 makes feedback unit 206 and grid underarm control circuit 203 and power Unit 205 constitutes the power D-flip flop having there are two types of stable state,

Equally, when the input terminal in2 of overcurrent protective power driving circuit inputs positive pulse, pulse front edge detection Unit 201 detects the rising edge of pulse, makes 203 output end of grid underarm control circuit in high-impedance state, grid upper arm control circuit 202 output high level, make the conducting of power cell 205 connect controlled load current, and make power-type by feedback unit 206 Trigger is locked at the SM set mode of the conducting of power cell 205,

It arrives and defeated in the failing edge of the positive pulse of the input terminal in2 input of overcurrent protective power driving circuit When entering termination and receiving low level, grid upper arm control circuit 202 exports high-impedance state, grid vacuum cavitations circuit 204 passes through grid Underarm control circuit 203 makes the input terminal connection grid negative pressure of power cell 205 enable power cell 205 cut-off, cut-out institute rapidly The load current of control, and so that power-type trigger is locked at the reset state that power cell ends by feedback unit 206,

Between the high period of the positive pulse of the input terminal in2 inputs of overcurrent protective power driving circuit, work as work( When output current overcurrent occurs for rate unit 205, feedback unit 206 is by the excessively high saturation voltage drop voltage signal of power cell 205 It exports to the input terminal of grid underarm control circuit 203, grid underarm control circuit 203 is made to drag down power cell 205 rapidly Input terminal voltage, and so that power D-flip flop is overturn rapidly by the strong feedback effect of feedback unit 206 and be locked at power The controlled load current of the reset state of unit cut-off, cut-out, makes power cell 205 be protected；

Third phase overcurrent protective power driving circuit includes pulse front edge detection unit 301, grid upper arm control circuit 302, grid underarm control circuit 303, grid vacuum cavitations circuit 304, power cell 305 and feedback unit 306, wherein：

Pulse front edge detection unit 301 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in3 connections,

Grid upper arm control circuit 302 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal in3 connections,

Grid underarm control circuit 303 includes input terminal, grid negative pressure incoming end and output end, input terminal and pulse front edge The output end of detection unit 301 connects,

Grid vacuum cavitations circuit 304 includes input, output end and grid negative pressure exit, input terminal and overcurrent protection The input terminal and pulse front edge of the input terminal in3 connections of type power driving circuit, output end and grid underarm control circuit 103 are examined Go out the output end of unit 301 while connecting, the grid negative pressure incoming end of grid negative pressure exit and grid underarm control circuit 303 Connection,

Power cell 305 includes input, output end and ground terminal, input terminal and grid underarm control circuit 103 it is defeated The output end of outlet and grid upper arm control circuit 302 connects simultaneously, and ground terminal connects circuit zero site (i.e. busbar cathode), The output end of power cell 305 is used to control the electric current of external circuit as the output end of overcurrent protective power driving circuit,

Feedback unit 306 includes input terminal and output end, and input terminal is connected with the output end of power cell 305, feedback The output end of member is connected with the input terminal of grid underarm control circuit 303, and feedback unit 306 constitutes grid underarm control circuit Signal positive feedback network between 303 and power cell 305 makes feedback unit 306 and grid underarm control circuit 303 and power Unit 305 constitutes the power D-flip flop having there are two types of stable state,

In the same manner as aforementioned, when the input terminal in3 of overcurrent protective power driving circuit inputs positive pulse, pulse Forward position detection unit 301 detects the rising edge of pulse, makes 303 output end of grid underarm control circuit in high-impedance state, grid upper arm Control circuit 302 exports high level, so that the conducting of power cell 305 is connected controlled load current, and pass through feedback unit 306 Power-type trigger is set to be locked at the SM set mode of the conducting of power cell 305,

It arrives and defeated in the failing edge of the positive pulse of the input terminal in3 input of overcurrent protective power driving circuit When entering termination and receiving low level, grid upper arm control circuit 302 exports high-impedance state, grid vacuum cavitations circuit 304 passes through grid Underarm control circuit 303 makes the input terminal connection grid negative pressure of power cell 305 enable power cell 305 cut-off, cut-out institute rapidly The load current of control, and so that power-type trigger is locked at the reset state that power cell ends by feedback unit 306,

Between the high period of the positive pulse of the input terminal in3 inputs of overcurrent protective power driving circuit, work as work( When output current overcurrent occurs for rate unit 305, feedback unit 306 is by the excessively high saturation voltage drop voltage signal of power cell 305 It exports to the input terminal of grid underarm control circuit 303, grid underarm control circuit 303 is made to drag down power cell 305 rapidly Input terminal voltage, and so that power D-flip flop is overturn rapidly by the strong feedback effect of feedback unit 306 and be locked at power The controlled load current of the reset state of unit cut-off, cut-out, makes power cell 305 be protected.

Output end out1, out2, out3 of three-phase control circuit are separately connected the control of the three-phase windings of motor (600) The common end at end, motor three-phase windings connects DC bus anode B+, and this connection relation can be used for controlling switching magnetic-resistance electricity Machine, magneto etc.；It is defeated that input terminal in1, in2, in3 of three-phase control circuit receive the processing circuits such as prime MCU, buffer circuit Outlet controls pulse, by aforementioned process it is found that any of which one machine winding short circuit, overcurrent can be protected.It can be with The extraction of overcurrent protection actuating signal is fed back into MCU or cpu, judges further protection comprehensively to carry out phase.

The third aspect provides a kind of motor-drive circuit, includes the overcurrent protective power driving circuit of first aspect.

Embodiment 4

As shown in fig. 6, being this cold end including upper tube and its control circuit that the utility model embodiment is provided Overcurrent protective three phase electric machine driving circuit (501), including three overcurrent protective power driving circuits form three-phase mistake Protection type power driving circuit is flowed,

3 stage overcurrent protection type power driving circuit is the first phase overcurrent protective power driving circuit, the second phase overcurrent guarantor Shield type power driving circuit and third phase overcurrent protective power driving circuit,

First phase overcurrent protective power driving circuit includes pulse front edge detection unit 101, grid upper arm control circuit 102, grid underarm control circuit 103, grid vacuum cavitations circuit 104, power cell 105, feedback unit 106, upper tube power Unit 108 and upper tube Gate control unit 107, wherein：

Pulse front edge detection unit 101 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal inA1 connections,

Grid upper arm control circuit 102 includes input terminal and output end, input terminal and overcurrent protective power driving circuit Input terminal inA1 connections,

Grid vacuum cavitations circuit 104 includes input, output end and grid negative pressure exit, input terminal and overcurrent protection The input terminal inA1 connections of type power driving circuit, the input terminal and pulse front edge of output end and grid underarm control circuit 103 The output end of detection unit 101 connects simultaneously, the grid negative pressure access of grid negative pressure exit and grid underarm control circuit 103 End connection,

Power cell 105 includes input, output end and ground terminal, input terminal and grid underarm control circuit 103 it is defeated The output end of outlet and grid upper arm control circuit 102 connects simultaneously, and ground terminal connects circuit zero site (i.e. busbar cathode), The output end of power cell 105 is used to control the electricity of outside winding as the output end outA of overcurrent protective power driving circuit Stream,

Upper tube power cell 108 includes input, output end and positive terminal, and upper tube Gate control unit 107 includes upper tube Driving pulse input terminal inA2, output end and pumping source input terminal Vh, the output end and power cell of upper tube power cell 108 105 output end connection, the input terminal of upper tube power cell 108 are connected with the output end of upper tube Gate control unit 107, anode The main power source of end connection overcurrent protective power driving circuit is positive (i.e. busbar anode B+), and the access of pumping source input terminal is higher than outer The pump pressure power supply for powering up voltage is used to provide enough gate drive voltages for upper tube power cell 108, and upper tube driving pulse is defeated Enter end for receiving the drive pulse signal needed for front stage circuits output end upper tube power cell 108, makes overcurrent protective power Driving circuit can realize that low and high level bipolar power drives,

For,

When the input terminal inA1 of overcurrent protective power driving circuit inputs positive pulse, pulse front edge detection unit The rising edge of 101 detection pulses, keeps 103 output end of grid underarm control circuit defeated in high-impedance state, grid upper arm control circuit 102 Go out high level, so that the conducting of power cell 105 is connected controlled load current, and so that power-type is triggered by feedback unit 106 Device is locked at the SM set mode of the conducting of power cell 105,

Arrive in the failing edge of the positive pulse of the input terminal inA1 input of overcurrent protective power driving circuit and When input terminal receives low level, grid upper arm control circuit 102 exports high-impedance state, grid vacuum cavitations circuit 104 passes through grid Pole underarm control circuit 103 makes the input terminal connection grid negative pressure of power cell 105 enable power cell 105 cut-off, cut-out rapidly The load current controlled, and so that power-type trigger is locked at the reset state that power cell ends by feedback unit 106,

Between the high period of the positive pulse of the input terminal inA1 inputs of overcurrent protective power driving circuit, work as work( When output current overcurrent occurs for rate unit 105, feedback unit 106 is by the excessively high saturation voltage drop voltage signal of power cell 105 It exports to the input terminal of grid underarm control circuit 103, grid underarm control circuit 103 is made to drag down power cell 105 rapidly Input terminal voltage, and so that power D-flip flop is overturn rapidly by the strong feedback effect of feedback unit 106 and be locked at power The controlled load current of the reset state of unit cut-off, cut-out, makes power cell 105 be protected；

Second phase overcurrent protective power driving circuit includes pulse front edge detection unit 201, grid upper arm control circuit 202, grid underarm control circuit 203, grid vacuum cavitations circuit 204, power cell 205, feedback unit 206, upper tube power Unit 208 and upper tube Gate control unit 207, circuit structure is identical as above-mentioned first phase structure, function is consistent, no longer superfluous herein It states.

Third phase overcurrent protective power driving circuit includes pulse front edge detection unit 301, grid upper arm control circuit 302, grid underarm control circuit 303, grid vacuum cavitations circuit 304, power cell 305, feedback unit 306, upper tube power Unit 308 and upper tube Gate control unit 307, circuit structure is identical as above-mentioned first phase or the second phase structure, function is consistent, This is repeated no more.

Output end outA, outB, outC of three-phase control circuit are separately connected the control of the three-phase windings of motor (601) End, here by taking motor three-phase windings use delta connection as an example, before input terminal inA1, inB1, inC1 reception of three-phase control circuit The processing circuit output end such as grade MCU, buffer circuit controls pulse, by aforementioned process it is found that one machine winding of any of which is short Road, overcurrent can be protected.Overcurrent protection actuating signal can also be drawn and feed back to MCU or cpu, to carry out phase judgement Further protection comprehensively.

It can be readily appreciated that in the above embodiment any overcurrent protective power driving circuit power cell 105 Or upper tube power cell 108, can be to reduce bipolar transistor IGBT or fet power transistor MOSFET.

The above embodiment is only used for illustrating the utility model, it is any according to technical solutions of the utility model by combination or The obtained new embodiment such as equivalent replacement is scope of protection of the utility model, and the scope of protection of the utility model is by weighing Sharp claim limits.

Claims

1. a kind of overcurrent protective power driving circuit, which is characterized in that including pulse front edge detection unit 101, grid upper arm Control circuit 102, grid underarm control circuit 103, grid vacuum cavitations circuit 104, power cell 105 and feedback unit 106, Wherein：

The pulse front edge detection unit 101 includes input terminal and output end, the input terminal and the overcurrent protective power The input terminal in1 connections of driving circuit,

The grid upper arm control circuit 102 includes input terminal and output end, the input terminal and the overcurrent protective power The input terminal in1 connections of driving circuit,

The grid underarm control circuit 103 includes input terminal, grid negative pressure incoming end and output end, the input terminal and described The output end of pulse front edge detection unit 101 connects,

The grid vacuum cavitations circuit 104 includes input, output end and grid negative pressure exit, the input terminal and described The input terminal in1 connections of overcurrent protective power driving circuit, the output end and the grid underarm control circuit 103 it is defeated Enter the output end at end and the pulse front edge detection unit 101 while connecting, under the grid negative pressure exit and the grid The grid negative pressure incoming end of arm control circuit 103 connects,

The power cell 105 includes input, output end and ground terminal, the input terminal and the grid underarm control circuit 103 output end and the output end of the grid upper arm control circuit 102 connect simultaneously, ground terminal connection circuit zero position The output end of point (i.e. busbar cathode), power cell 105 is used for as the output end of the overcurrent protective power driving circuit The electric current of external circuit is controlled,

The feedback unit 106 includes input terminal and output end, the output end company of the input terminal and the power cell 105 It connects, the output end of the feedback unit is connected with the input terminal of the grid underarm control circuit 103, and the feedback unit 106 constitute the signal positive feedback network between the grid underarm control circuit 103 and power cell 105, make the feedback Member 106 and the grid underarm control circuit 103 and power cell 105 constitute the power D-flip flop having there are two types of stable state,

For,

When the input terminal in1 of the overcurrent protective power driving circuit inputs positive pulse, the pulse front edge detection Unit 101 detects the rising edge of the pulse, makes 103 output end of grid underarm control circuit in high-impedance state, the grid Upper arm control circuit 102 exports high level, so that the conducting of the power cell 105 is connected controlled load current, and pass through institute The SM set mode that feedback unit 106 makes the power-type trigger be locked at the conducting of the power cell 105 is stated,

Failing edge arrival in the positive pulse of the input terminal in1 inputs of the overcurrent protective power driving circuit and institute When stating input terminal and receiving low level, the grid upper arm control circuit 102 exports high-impedance state, the grid vacuum cavitations circuit 104 make the input terminal of the power cell 105 connect grid negative pressure by the grid underarm control circuit 103 enables the power The load current that unit 105 ends rapidly, cut-out is controlled, and the power D-flip flop is made by the feedback unit 106 It is locked at the reset state of the power cell cut-off,

Between the high period of the positive pulse of the input terminal in1 inputs of the overcurrent protective power driving circuit, work as institute When stating power cell 105 output current overcurrent occurs, the feedback unit 106 is by the excessively high saturation of the power cell 105 Pressure drop voltage signal is exported to the input terminal of the grid underarm control circuit 103, keeps the grid underarm control circuit 103 fast Speed drags down the input terminal voltage of the power cell 105, and makes the work(by the strong feedback effect of the feedback unit 106 Rate D-flip flop overturns rapidly and is locked at the reset state of the power cell cut-off, cuts off controlled load current, makes The power cell 105 is protected.

2. overcurrent protective power driving circuit according to claim 1, which is characterized in that further include：Upper tube power list Member 108 and upper tube Gate control unit 107, the upper tube power cell 108 includes input, output end and positive terminal, described Upper tube Gate control unit 107 includes upper tube driving pulse input terminal in22, output end and pumping source input terminal Vh, wherein

The output end of the upper tube power cell 108 is connected with the output end of the power cell 105, the upper tube power cell 108 input terminal is connected with the output end of the upper tube Gate control unit 107, and the positive terminal connects the overcurrent protective The main power source anode (i.e. busbar anode) of power driving circuit, pump of the pumping source input terminal access higher than additional power source voltage Voltage source is used to provide enough gate drive voltages for the upper tube power cell 108, and the upper tube driving pulse input terminal is used In receiving the drive pulse signal needed for front stage circuits output end upper tube power cell 108, the overcurrent protective power is made to drive Dynamic circuit can realize that low and high level bipolar power drives.

3. overcurrent protective power driving circuit as described in claim 1, which is characterized in that

The pulse front edge detection unit 101 includes input capacitance C1, transistor Q1, resistance R1 and diode D1, wherein：It is described One end of input capacitance C1 is as the input terminal of the pulse front edge detection unit 101 and overcurrent protective power drive electricity One end of the input terminal in1 connections on road, the other end of the input capacitance C1 and the resistance R1, the diode D1 it is negative Pole, the transistor Q1 base stage connect simultaneously, the other end of the resistance R1 and the anode of diode D1, triode Q1 hair Emitter-base bandgap grading is grounded simultaneously, the output end of the collector of the triode Q1 as the pulse front edge detection unit 101,

The grid upper arm control circuit 102 includes transistor Q2, Q3, Q4 and resistance R2, R3, R4, the hair of the transistor Q2 Emitter grounding, resistance R2 one end connect the transistor Q2 base stages, the other end of resistance R2 is controlled as the grid upper arm The input terminal of circuit is connected with the input terminal in1 of the overcurrent protective power driving circuit, and the collector of transistor Q2 passes through The collector pole of the resistance R3 and transistor Q3 and the base stage of the transistor Q4 connect simultaneously, the transistor Q3 Emitter and the transistor Q4 emitter simultaneously connect with the grid supply voltage end of circuit, the base of the transistor Q3 Pole connects with the collector of the transistor Q4 by resistance R4 and is used as the output end of the grid upper arm control circuit 102,

The grid underarm control circuit 103 includes transistor Q5, diode D4 and diode D5, the transmitting of the transistor Q5 The anode of pole and the diode D5 are connected to the grid negative pressure incoming end of the grid underarm control circuit 103, and described two The cathode of pole pipe D5 is grounded, the anode of the base stage connection diode D4 of the transistor Q5, the cathode conduct of the diode D4 The input terminal of the grid underarm control circuit 103 is connected with the output end of the pulse front edge detection unit 101, the crystal The collector of pipe Q5 as the grid underarm control circuit 103 output end and the grid upper arm control circuit 102 it is defeated Outlet connects,

The grid vacuum cavitations circuit 104 includes transistor Q6, Q7 and diode D3, resistance R6, R7, R8, transistor Q7's Emitter connects the grid supply voltage end of circuit, and one end of the base stage connection resistance R6 of the transistor Q7, resistance R6's is another Input terminal of the one end as the input terminal and the overcurrent protective power driving circuit of the grid vacuum cavitations circuit 104 In1 connections, the grid negative pressure feeder ear of the emitter connection circuit of the transistor Q6, the base stage of the transistor Q6 pass through electricity One end of the collector, the resistance R7 that hinder the R8 and transistor Q7 connects simultaneously, and the other end of the resistance R7 connects institute State the cathode of positive, the described diode D3 of diode D3 as the grid vacuum cavitations circuit 104 output end with it is described The input terminal of the grid underarm control circuit 103 connects, and the collector of the transistor Q6 is as the grid vacuum cavitations The grid negative pressure exit of circuit 104 is connect with the grid negative pressure incoming end of the grid underarm control circuit 103,

The power cell 105 includes igbt Q8, and the grid of the igbt Q8 is as institute State the output end and the grid upper arm control circuit 102 of 105 input terminal of power cell and the grid underarm control circuit 103 Output end connect simultaneously, the ground terminal connection of the transmitting extremely power cell 105 of the igbt Q8 Circuit zero site (i.e. busbar cathode), the extremely described power cell 105 of current collection of the igbt Q8 and institute The output end for stating overcurrent protective power driving circuit is used to control the electric current of external circuit,

The feedback unit 106 includes diode D2 and resistance R5, and the cathode of the diode D2 is as the feedback unit 106 Input terminal is connected with the output end of the power cell 105, and the anode of the diode D2 is defeated as the feedback unit 106 Outlet is connected with the input terminal of the grid underarm control circuit 103, the resistance R5 be connected to the diode D2 anodes and The grid voltage feeder ear of circuit makes the feedback unit 106 constitute the grid underarm control circuit 103 and power cell Signal positive feedback network between 105, the feedback unit 106 and the grid underarm control circuit 103 and power cell 105 The power D-flip flop having there are two types of stable state is constituted,

For,

4. overcurrent protective power driving circuit as claimed in claim 2, it is characterised in that including,

The upper tube power cell 108 includes igbt Q9, and the grid of the igbt Q9 is The input terminal of the upper tube power cell 108 is connected with the output end of the upper tube Gate control unit 107, and the insulated gate is double The emitter of gated transistors Q9 connects as the output end of the upper tube power cell 108 and the output end of the power cell 105 It connects, the collector of the igbt Q9 connects the overcurrent as the positive terminal of the upper tube power cell 108 The main power source anode (i.e. busbar anode) of protection type power driving circuit,

The upper tube Gate control unit 107 includes upper tube driving pulse input terminal in22, output end and pumping source input terminal Vh, The pumping source input terminal access is used to provide foot for the upper tube power cell 108 higher than the pump pressure power supply of additional power source voltage Enough gate drive voltages, the upper tube driving pulse input terminal is for receiving 108 institute of front stage circuits output end upper tube power cell The drive pulse signal needed enables the overcurrent protective power driving circuit to realize that low and high level bipolar power drives,

For,

5. a kind of motor-drive circuit, it is characterised in that including overcurrent protective power driving circuit described in claim 1.

6. motor-drive circuit as claimed in claim 5, which is characterized in that including three overcurrent protective power drives Circuit forms the 3 stage overcurrent protection type power driving circuit for driving three phase electric machine, the 3 stage overcurrent protection type power Driving circuit is the first phase overcurrent protective power driving circuit, the second phase overcurrent protective power driving circuit and third phase mistake Protection type power driving circuit is flowed, is inputted just in the input terminal in1 of the overcurrent protective power driving circuit of each phase Between the high period of polar impulse, when output current overcurrent occurs for the phase power cell, the phase overcurrent protective power drive The load current that circuitry cuts are controlled makes the power cell be protected.

7. a kind of motor-drive circuit, it is characterised in that including the overcurrent protective power driving circuit described in claim 2.

8. motor-drive circuit as claimed in claim 7, which is characterized in that including three overcurrent protective power drives Circuit forms the 3 stage overcurrent protection type power driving circuit for driving three phase electric machine, the 3 stage overcurrent protection type power Driving circuit is the first phase overcurrent protective power driving circuit, the second phase overcurrent protective power driving circuit and third phase mistake Protection type power driving circuit is flowed, is inputted just in the input terminal in1 of the overcurrent protective power driving circuit of each phase Between the high period of polar impulse, when output current overcurrent occurs for the phase power cell, the phase overcurrent protective power drive The load current that circuitry cuts are controlled makes the power cell be protected.

9. according to the overcurrent protective power driving circuit described in claim 1,2,3, any one of 4, which is characterized in that described The power cell or upper tube power cell of overcurrent protective power driving circuit use IGBT or MOSFET.