CN206461344U - A kind of motor driving protection circuit of steering controller - Google Patents

Abstract

The utility model discloses a kind of motor driving protection circuit of steering controller, including power supply, single-chip microcomputer, driving chip, drive axle, boost chip, power protection on-off circuit and phase protection switch circuit, described power protection on-off circuit respectively with power supply, drive axle and boost chip connection, described boost chip and single-chip microcomputer, power protection on-off circuit and the connection of phase protection circuit, described single-chip microcomputer and boost chip, driving chip and drive axle connection, described driving chip is connected with single-chip microcomputer and drive axle, described drive axle respectively with power protection on-off circuit, driving chip and the connection of phase protection switch circuit.By the above-mentioned means, the motor driving protection circuit of steering controller of the present utility model, solves drive circuit the problem of performance in the case of extreme temperature; improve driving force and controller size, service life, from the fast device of switching speed; protect the response time short, increase operating efficiency.

Description

A kind of motor driving protection circuit of steering controller

Technical field

The utility model is related to the protection of power supply and motor output, more particularly to a kind of motor driving of steering controller is protected Protection circuit.

Background technology

The protection circuit of the motor drive controller of steering controller, as protection device, passes through control generally using relay Relay processed open close realize power supply and motor output conducting, cut-out purpose.

Closing protected mode was opened using electromagnetic type relay in the past, the service life of controller is shorter；Extreme low temperature or Opening, which easily occurs, in relay under hot environment closes abnormal situation；The space limitation of vehicle, the size of controller can not mistake Greatly, structure wants compact, it is necessary to reduce the area of circuit board as far as possible, and the volume of relay is larger, is ensureing big driving power Under conditions of controller be difficult to do small；The reaction time of Control is long, and the time being typically opened or closed will reach 10ms More than, it is long for the steering controller protection response time, in fact it could happen that defencive function goes out to turn now to lose when completion also The risk of control.

What electromagnetic type relay was typically made up of iron core, coil, armature, contact reed etc..As long as being added at coil two ends Certain electric current is will pass through in certain voltage, coil, so as to produce galvanomagnetic-effect, armature will electromagnetic attracting force work The pulling force of return spring is overcome to be drawn to iron core under, so that movable contact and stationary contact with moving armature（Normally opened contact）Adhesive.When After coil blackout, the suction of electromagnetism also disappears therewith, and armature will return to original position in the reaction force of spring, make to touch Point and original stationary contact（Normally-closed contact）Adhesive.So adhesive, release, have reached in circuit by the action of mechanical contact Conducting, cut-out purpose.Be present mechanical wear, electric arc burn, contact and the phenomenon such as occur shaking in contact, inhale when opening closing Close, the time of release can not accomplish less than ms grades, contact endurance is short, and reliability and maintainability are poor.

Utility model content

The utility model is solved mainly solving the technical problems that provide a kind of motor driving protection circuit of steering controller Drive circuit determined the problem of performance in the case of extreme temperature, has improved driving force and controller size, service life is selected The fast device of switching speed, the protection response time is short, increases operating efficiency.

In order to solve the above technical problems, the technical scheme that the utility model is used is：There is provided a kind of course changing control The motor driving protection circuit of device, including power supply, single-chip microcomputer, driving chip, drive axle, boost chip, power protection switch electricity Road and phase protection switch circuit, described power protection on-off circuit are connected with power supply, drive axle and boost chip respectively, institute The boost chip stated is connected with single-chip microcomputer, power protection on-off circuit and phase protection circuit, described single-chip microcomputer and boost chip, Driving chip and drive axle connection, described driving chip is connected with single-chip microcomputer and drive axle, described drive axle respectively with electricity Source protection on-off circuit, driving chip and the connection of phase protection switch circuit.

In one preferred embodiment of the utility model, described power protection on-off circuit is by input, output and control Part is constituted, described importation connection power supply, output par, c connection drive axle, control section connection boost chip.

In one preferred embodiment of the utility model, described drive axle uses three-phase drive bridge, by 6 MOSFET groups Into.

In one preferred embodiment of the utility model, described power protection on-off circuit is by 2 NMOSFET.

In one preferred embodiment of the utility model, described phase protection switch circuit is made up of 3 MOSFET.

In one preferred embodiment of the utility model, the signal EN1 ' of described boost chip output controls power protection On-off circuit opens shut-off.

In one preferred embodiment of the utility model, described single-chip microcomputer exports 2 tunnel control signal EN1 and EN2 respectively To boost chip, make the conducting of the output signal independent control power protection on-off circuit and phase protection switch circuit of boost chip With closing.

In one preferred embodiment of the utility model, described single-chip microcomputer exports 6 road pwm signals to driving chip, and Detect the working condition of driving chip；It is connected with the feedback signal of drive axle, detects the working condition of drive axle.

In one preferred embodiment of the utility model, described driving chip exports phase according to the pwm signal of single-chip microcomputer The 6 road pwm signals answered are to drive axle.

In one preferred embodiment of the utility model, described also includes motor, the signal EN2 ' of boost chip output The shut-off of opening of phase protection switch circuit is controlled, phase protection switch circuit exports the drive signal of drive axle to motor, driving Motor works.

The beneficial effects of the utility model are：The motor driving protection circuit of steering controller of the present utility model, is solved Drive circuit improves driving force and controller size the problem of performance in the case of extreme temperature, service life, from opening Fireballing device is closed, the protection response time is short, increases operating efficiency.

Brief description of the drawings

, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the utility model embodiment The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings Other accompanying drawings are obtained, wherein：

Fig. 1 is the connection signal block diagram of the preferred embodiment of motor driving protection circuit one of steering controller；

Fig. 2 is the circuit diagram of power protection on-off circuit；

Fig. 3 is the circuit diagram of phase protection switch circuit；

Fig. 4 is the circuit diagram of boost chip.

Embodiment

The technical scheme in the utility model embodiment will be clearly and completely described below, it is clear that described Embodiment is only a part of embodiment of the present utility model, rather than whole embodiments.Based on the implementation in the utility model Example, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to The scope of the utility model protection.

As shown in figure 1, the utility model embodiment includes：

A kind of motor driving protection circuit of steering controller, including power supply, single-chip microcomputer, driving chip, drive axle, boosting Chip, power protection on-off circuit and phase protection switch circuit, described power protection on-off circuit respectively with power supply, driving Bridge and boost chip connection, described boost chip is connected with single-chip microcomputer, power protection on-off circuit and phase protection circuit, described Single-chip microcomputer be connected with boost chip, driving chip and drive axle, described driving chip is connected with single-chip microcomputer and drive axle, institute The drive axle stated is connected with power protection on-off circuit, driving chip and phase protection switch circuit respectively.

In above-mentioned, described power protection on-off circuit is made up of input, output and control section, described importation Connect power supply, output par, c connection drive axle, control section connection boost chip.

Wherein, signal EN1 ' the control power protection on-off circuits of described boost chip output open shut-off.It is described Single-chip microcomputer export 2 tunnel control signal EN1 and EN2 respectively to boost chip, make the output signal independent control electricity of boost chip The conducting and closing of source protection on-off circuit and phase protection switch circuit.Described single-chip microcomputer exports 6 road pwm signals to driving core Piece, and detect the working condition of driving chip；It is connected with the feedback signal of drive axle, detects the working condition of drive axle.It is described Driving chip according to the pwm signal of single-chip microcomputer, output corresponding 6 road pwm signal to drive axle.It is described in the present embodiment Also include motor, signal EN2 ' the control phase protection switch circuits of boost chip output open shut-off, phase protection switch circuit The drive signal of drive axle is exported to motor, motor work.

Single-chip microcomputer is used to control boost signal, output driving pwm signal, collection signal etc.；Driving chip includes 6 road PWM Input, 6 road PWM outputs, with functions such as fault alarms；Drive axle uses three-phase drive bridge, is made up of 6 MOSFET；Boosting Chip generation protection MOSFET grid control signal, controls power supply and phase line protection switch respectively；Power protection on-off circuit Mainly it is made up of 2 MOSFET；Phase protection switch circuit is mainly made up of 3 MOSFET.

The power protection on-off circuit of 2 MOSFET compositions can power when opening to drive axle, and MOSFET internal resistance is small, Have the advantages that loss is low；The power supply of drive axle can be turned off during closing, MOSFET leakage current is small, during closing, quiescent current Small, quiescent dissipation is low.Phase protection switch circuit is made up of 3 MOSFET, when opening, and three-phase bridge drive signal is output to motor, MOSFET is met while three-phase bridge, impedance is essentially identical, three-phase output is relatively balanced；During closing, three-phase is simultaneously turned off, and is completely cut through Driving output.

During controller normal work, single-chip microcomputer output signal EN1, EN2, via boost chip, output signal EN1 ', EN2 ', final control power protection on-off circuit and phase protection switch circuit are open-minded by protection circuit；Single-chip microcomputer output PWM controls Signal processed, by driving chip, drive axle and phase protection circuit, final output to motor, controlled motor work.

When controller is normal abnormal or standby, single-chip microcomputer output signal EN1, EN2, via boost chip, output signal EN1 ', EN2 ', final control power protection on-off circuit and phase protection switch circuit, protection circuit is closed.Close open-phase protection On-off circuit so that the output signal of drive axle can not reach motor；Power cutoff protection switch circuit so that power supply and driving Bridge disconnects, it is ensured that motor is without output.

Power protection on-off circuit reference picture 2, single-chip microcomputer output signal EN1 rises by the control of the devices such as resistance, triode The VCP signals of pressure chip output and MOSFET grid open closing.When signal EN1 is high level, during triode ON, VCP signals are inputted to MOSFET grids, open MOSFET；When signal EN1 be low level when, triode end when, VCP signals with MOSFET grids disconnect, and close MOSFET.The main body of power protection on-off circuit is made up of 2 MOSFET, can both realize electricity The effect of source reverse connecting protection, while playing a part of protection switch；MOSFET internal resistance is small when opening, low excellent with being lost Point, can complete switch off the power supply of the power supply of vehicle body and drive axle during closing, the problems such as short circuit occurs for drive circuit, The power supply of vehicle body is not interfered with, or drive circuit is not turned on yet during reverse power connection；MOSFET leakage current is small, quiet State electric current is small, and quiescent dissipation is low.

Phase protection switch circuit reference picture 3, single-chip microcomputer output signal EN2 is by device controller liters such as resistance, triodes The VCP signals and MOSFET grid that pressure chip 3 is exported open closing.When signal EN2 is high level, during triode ON, VCP signals are inputted to MOSFET grids, open MOSFET；When signal EN2 be low level when, triode end when, VCP signals with MOSFET grids disconnect, and close MOSFET.The main body of phase protection switch circuit is made up of 3 MOSFET, MOSFET when opening Internal resistance is small, has the advantages that loss is low, the impedance of three-phase bridge is essentially identical, makes three-phase output balance, and the fluctuation of motor can compare Small, rotation can be smoothed out more；During closing, three-phase is simultaneously turned off, and completely cuts through driving output.MOSFET concrete model and encapsulation Power of motor, controller architecture can be combined to be determined.

The response of EPS controllers requires higher, when failures are detected, it is necessary to which unexpectedly may be fast export motor is closed Disconnected, MOSFET response is high, can reach ns grades, MOSFET can rapidly be turned off by running into when protection needs, and this practicality is new Type, which can be realized, quickly disconnects motor output and the power supply of drive circuit.

Boost chip reference picture 4, by bootstrap capacitor and charge pump（charge pump）Composition, main function is by VBB Voltage raises into VCP, and VCP magnitude of voltage is typically 2 times of VBB.

The motor driving protection circuit of steering controller of the present utility model has the following advantages that compared to prior art：

1st, MOSFET small volume, can reduce the volume of controller, be easy to production to install；

2nd, model can select the MOSFET same models with drive axle, be easy to materials procurement, management, production；

3rd, MOSFET internal resistances are low, and the heat waste produced in the course of work is small；

4th, MOSFET good temp characteristics, can under more severe temperature environment normal work；

5th, MOSFET is semiconductor technology products, and life cycle is long；

6th, the time of switch mosfet is short, can reach ns grades of controls；

7th, phase protection circuit is using 3 MOSFET, and output impedance is more balanced, and motor work is more smoothed out.

In summary, the motor driving protection circuit of steering controller of the present utility model, solves drive circuit in pole The problem of holding performance under temperature conditions, improves driving force and controller size, service life, from the fast device of switching speed Part, the protection response time is short, increases operating efficiency.

Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, it is every The equivalent structure or equivalent flow conversion made using the utility model description, or directly or indirectly it is used in other phases The technical field of pass, is similarly included in scope of patent protection of the present utility model.

Claims (10)

1. a kind of motor driving protection circuit of steering controller, it is characterised in that including power supply, single-chip microcomputer, driving chip, drive Dynamic bridge, boost chip, power protection on-off circuit and phase protection switch circuit, described power protection on-off circuit respectively with Power supply, drive axle and boost chip connection, described boost chip and single-chip microcomputer, power protection on-off circuit and phase protection circuit Connection, described single-chip microcomputer is connected with boost chip, driving chip and drive axle, described driving chip and single-chip microcomputer and driving Bridging is connect, and described drive axle is connected with power protection on-off circuit, driving chip and phase protection switch circuit respectively.

2. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described power supply is protected Shield on-off circuit is made up of input, output and control section, described importation connection power supply, output par, c connection driving Bridge, control section connection boost chip.

3. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described drive axle Using three-phase drive bridge, it is made up of 6 MOSFET.

4. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described power supply is protected On-off circuit is protected by 2 NMOSFET.

5. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described mutually protection On-off circuit is made up of 3 MOSFET.

6. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described boosting core Signal EN1 ' the control power protection on-off circuits of piece output open shut-off.

7. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described single-chip microcomputer 2 tunnel control signal EN1 and EN2 are exported respectively to boost chip, open the output signal independent control power protection of boost chip Powered-down road and the conducting and closing of phase protection switch circuit.

8. the motor driving protection circuit of steering controller according to claim 1, it is characterised in that described single-chip microcomputer 6 road pwm signals are exported to driving chip, and detect the working condition of driving chip；It is connected with the feedback signal of drive axle, detects The working condition of drive axle.

9. the motor driving protection circuit of steering controller according to claim 7, it is characterised in that described driving core Piece is according to the pwm signal of single-chip microcomputer, output corresponding 6 road pwm signal to drive axle.

10. the motor driving protection circuit of steering controller according to claim 8, it is characterised in that described motor Drive Protecting Circuit also includes motor, and signal EN2 ' the control phase protection switch circuits of boost chip output open shut-off, phase Protection switch circuit exports the drive signal of drive axle to motor, motor work.