CN206835022U - A kind of driven by Brush-Less DC motor control system - Google Patents

Abstract

The utility model embodiment discloses a kind of driven by Brush-Less DC motor control system, including：Single-chip microcomputer, driving chip, switch module, DC brushless motor and protection module；Wherein, single-chip microcomputer electrically connects with the driving chip, for outputing control signals to the driving chip；The driving chip is electrically connected with the switch module, for output drive signal to the switch module, so that the switch module drives the DC brushless motor；Enable Pin of the protection module respectively with the DC brushless motor and the driving chip electrically connects; for obtaining the sample rate current during DC brushless motor work; and when sample rate current is more than given threshold, the driving chip output drive signal is forbidden to the switch module by the Enable Pin of the driving chip；Wherein, the switch module includes multiple N-channel MOS pipes.The technical scheme that the utility model embodiment provides, can solve the problems, such as drive circuit protecting effect difference.

Description

A kind of driven by Brush-Less DC motor control system

Technical field

The utility model embodiment is related to drive and control of electric machine technical field, more particularly to a kind of driven by Brush-Less DC motor Control system.

Background technology

In machine field, brshless DC motor development is quick and is widely used, and brshless DC motor is widely used in daily The devices such as life appliance, auto industry, aviation, consumer electronics, medical electronic, industrial automation and instrument.Brshless DC motor Without using the commutator of mechanical structure, there is the advantages of many compared to brush motor in use, for example, preferably torsion can be obtained Square rotary speed property, can dynamic response, efficiency high, long lifespan, noise is low, and rotating speed height etc..In addition, DC brushless motor is more Excellent moment of torsion and appearance and size ratio cause it to be particularly suited for motor own wt and the more sensitive occasion of size ratio.

But existing driven by Brush-Less DC motor control aspect comes with some shortcomings, for example, circuit protection function is made Not enough, once there is motor rotation blockage, moment excessive electric current easily burns out power drive pipe.

Utility model content

The utility model provides a kind of driven by Brush-Less DC motor control system, to solve drive circuit protecting effect difference Problem.

The utility model embodiment provides a kind of driven by Brush-Less DC motor control system, including：Single-chip microcomputer, driving core Piece, switch module, DC brushless motor and protection module；

Wherein, single-chip microcomputer electrically connects with the driving chip, for outputing control signals to the driving chip；

The driving chip is electrically connected with the switch module, for output drive signal to the switch module, so that The switch module drives the DC brushless motor；

Enable Pin of the protection module respectively with the DC brushless motor and the driving chip electrically connects, for obtaining The sample rate current during DC brushless motor work is taken, and when sample rate current is more than given threshold, passes through the driving core The Enable Pin of piece forbids the driving chip output drive signal to the switch module；

Wherein, the switch module includes multiple N-channel MOS pipes.

A kind of driven by Brush-Less DC motor control system that the utility model embodiment provides, including single-chip microcomputer, driving core Piece, switch module, DC brushless motor and protection circuit, single-chip microcomputer electrically connect with driving chip, for output control signal To the driving chip, driving chip is electrically connected with switch module, for output drive signal to switch module, so that switching molding Block drives DC brushless motor, and Enable Pin of the protection module respectively with DC brushless motor and driving chip electrically connects, and is used for Sample rate current during DC brushless motor work is obtained, and when sample rate current is more than given threshold, passes through making for driving chip Forbid driving chip output drive signal to switch module, then DC brushless motor stop motion in energy end.Solves conventional ADS driving When the problem of circuit protection effect difference, situations such as preventing DC brushless motor stall occur, excessive electric current burns switch module Power drive pipe situation.

Brief description of the drawings

Fig. 1 is a kind of structural representation for driven by Brush-Less DC motor control system that the utility model embodiment provides；

Fig. 2 is the structural representation for the DC Brushless Motor that the utility model embodiment provides；

Fig. 3 is the circuit structure diagram for the switch module that the utility model embodiment provides；

Fig. 4 is the structure chart of the driving chip that the utility model embodiment provides and its peripheral circuit；

Fig. 5 is the structural representation for another driven by Brush-Less DC motor control system that the utility model embodiment provides Figure；

Fig. 6 is the internal circuit configuration figure for the protection module that the utility model embodiment provides.

Embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein Described specific embodiment is used only for explaining the utility model, rather than to restriction of the present utility model.Further need exist for It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.

The utility model embodiment provides a kind of driven by Brush-Less DC motor control system, and Fig. 1 is that the utility model is implemented A kind of structural representation for driven by Brush-Less DC motor control system that example provides, the driven by Brush-Less DC motor control system bag Include：Single-chip microcomputer 1, driving chip 2, switch module 3, DC brushless motor 4 and protection module 5；

Wherein, single-chip microcomputer 1 electrically connects with driving chip 2, for outputing control signals to driving chip 2；

Driving chip 2 is electrically connected with switch module 3, for output drive signal to switch module 3, so that switch module 3 Drive DC brushless motor 4；

Enable Pin of the protection module 5 respectively with DC brushless motor 4 and driving chip 2 electrically connects, for obtain direct current without Sample rate current when brush motor 4 works, and when sample rate current is more than given threshold, forbidden by the Enable Pin of driving chip 2 The output drive signal of driving chip 2 is to switch module 3；

Wherein, switch module 3 includes multiple N-channel MOS pipes 31.

DC brushless motor 4 described in the present embodiment belongs to one kind of synchronous motor, magnetic field caused by its stator and turn Magnetic field caused by son is same frequency, so synchronous motor will not produce the frequency difference phenomenon of common induction machine.Brush DC electricity Machine 4 has a single-phase and three phase electric machine difference, the difference of facies type determine stator winding number, DC brushless motor 4 is determined Son is to be formed by many silicon steel sheets by laminating with axial punch, has certain coil to constitute winding in each jet-bedding.

DC brushless motor 4 is different from brushed DC motor, and DC brushless motor 4 is used and electronically commutated.According to turn To be powered according to energization order to corresponding stator coil, the position of stator is passed by being embedded into the Hall of stator for the position of son What sensor perceived.With reference to figure 2, Fig. 2 be the utility model embodiment provide DC Brushless Motor structural representation, Fig. 2 Only carried out so that rotor is on the inside of stator as an example schematically illustrate, rotor can also be arranged on the outside of stator, and the present embodiment does not enter to this Row limits, and DC brushless motor 4 includes stator 41 and rotor 42, and Fig. 2 is by taking three-phase direct-current brushless motor as an example, including three stators Coil, three coils represent U, V and W three-phase coil, are connected respectively with U, V with W three-phase voltages respectively.Hall sensor 43 is set Close to the position of coil on stator, the hall signal of Hall sensor 43 can transmit magnet steel on rotor 42 relative to coil Position, according to the hall signal of three Hall sensors 43 can make single-chip microcomputer 1 know how give DC brushless motor 4 line Circle power supply, different hall signals represent the electric current that correspondence direction is provided to coil.Rotor 42 shown in Fig. 2 only shows one To electrode, the electrode can also be two pairs, four equities, and Hall sensor 43 can obtain rotor according to the number of electrodes detected and turn The number of turns crossed, so as to obtain the speed of rotor.

With reference to figure 1, the driven by Brush-Less DC motor control system of the present embodiment employs pre-driver chip and is driven, Single-chip microcomputer 1 is used to send control signal to driving chip 2, to be controlled to DC brushless motor 4.For example, single-chip microcomputer 1 passes through To the sending direction control signal of driving chip 2, it is controlled with the direction rotated to DC brushless motor 4；Single-chip microcomputer is to described Driving chip 2 sends brake control signal, to carry out brake control to DC brushless motor 4.

For the output drive signal of driving chip 2 to switch module 3, switch module 3 is to include opening for multiple N-channel MOS pipes 31 Powered-down road, on-off circuit electrically connect with DC brushless motor 4, and N-channel MOS pipe 31 is selective for described in Fig. 2 as switch Coil is powered, and drives DC brushless motor 4, and DC brushless motor 4 is rotated all along the direction of setting.

Driven by Brush-Less DC motor control system described in the present embodiment also includes protection module 5, protection module 5 and direct current Brushless electric machine 4 electrically connects, for obtaining the work electricity of sample rate current when DC brushless motor 4 works, i.e. DC brushless motor 4 Stream, and when sample rate current is more than and sets threshold value, the output drive signal of driving chip 2 is forbidden by the Enable Pin of driving chip 2 To switch module 3, then switch module 3 will not drive DC brushless motor 4 to work, then will not be to the N-channel in switch module 3 Other devices of metal-oxide-semiconductor 31 or circuit damage.Protection module 5, DC brushless motor 4 and driving chip 2 form one Individual reponse system, can be when electric current be more than safety value, and stopping driving chip 2 of making a response immediately drives to switch module 3 It is dynamic, the switching tube being effectively protected in switch module 3, and traditional protection scheme always compares hysteresis, when detecting electric current It is excessive, it is often not prompt enough when being protected to circuit.

Switching tube in the present embodiment in switch module 3 uses SMD N-channel all using N-channel MOS pipe Metal-oxide-semiconductor monomer, rapid heat dissipation, small volume, it is easy to the miniaturization of brush DC electrode drive control system to set, and N-channel MOS Pipe low cost.P-channel metal-oxide-semiconductor is not selected, and P-channel metal-oxide-semiconductor volume is big, and price is high, and integrally disposed, is unfavorable for using out Close in module 3.

A kind of driven by Brush-Less DC motor control system that the utility model embodiment provides, including single-chip microcomputer, driving core Piece, switch module, DC brushless motor and protection circuit, single-chip microcomputer electrically connect with driving chip, for output control signal To the driving chip, driving chip is electrically connected with switch module, for output drive signal to switch module, so that switching molding Block drives DC brushless motor, and Enable Pin of the protection module respectively with DC brushless motor and driving chip electrically connects, and is used for Sample rate current during DC brushless motor work is obtained, and when sample rate current is more than given threshold, passes through making for driving chip Forbid driving chip output drive signal to switch module, then DC brushless motor stop motion in energy end.Solves conventional ADS driving When the problem of circuit protection effect difference, situations such as preventing DC brushless motor stall occur, excessive electric current burns switch module Power drive pipe situation.And the switching tube in switch module uses N-channel MOS pipe, and cost is low, and single body radiating is fast, body Product is small, is advantageous to switch module and DC brushless motor is driven.

On the basis of above-described embodiment, single-chip microcomputer 1 is additionally operable to receive the DC brushless motor 4 that driving chip 2 obtains Motor position information and rotary speed information, and control signal is adjusted according to motor position information and rotary speed information.

From above-described embodiment, single-chip microcomputer 1 sends control signal to control DC brushless motor 4 to driving chip 2.It is single Piece machine 1 is additionally operable to receive the motor position information for the DC brushless motor 4 that driving chip 2 is obtained by Hall sensor 43 and turned Fast information, driving chip 2 obtain the analog signal that Hall sensor 43 obtains, and the analog signal is converted into by driving chip 2 Digital data transmission to single-chip microcomputer 1, single-chip microcomputer 1 carries out the control of ratio, integration and differential according to data signal, calculates in real time Control signal, and control signal is delivered to driving chip 2.Exemplary, if obtaining rotary speed information and the position of motor Information, by the calculating of ratio, integration and differential, new speed revolution value is obtained, then pwm pulse control signal has been adjusted It is whole, so as to control DC brushless motor 4 to be rotated with new rotating speed.

With reference to figure 3, Fig. 3 is the circuit structure diagram for the switch module that the utility model embodiment provides.It is straight in the present embodiment Stream brushless electric machine is three-phase direct-current brushless motor；

Switch module includes six N-channel MOS pipes, respectively the first N-channel MOS pipe V1, the second N-channel MOS pipe V2, Three N-channel MOS pipe V3, the 4th N-channel MOS pipe V4, the 5th N-channel MOS pipe V5 and the 6th N-channel MOS pipe V6；

First N-channel MOS pipe V1, the 3rd N-channel MOS pipe V3 and the 5th N-channel MOS pipe V5 the first output end electrically connect And electrically connected with the first level output end VM, the second output end is respectively the same as the 4th N-channel MOS pipe V4, the 6th N-channel MOS pipe V6 While electrical connection with the second N-channel MOS pipe V2 the first output end, U output ends, V output ends and W output ends are drawn respectively, Electrically connected for the three-phase windings coil respectively with three-phase direct-current brushless motor；

4th N-channel MOS pipe V2, the 6th N-channel MOS pipe V4 and the second N-channel MOS pipe V6 the second output end electrically connect And electrically connected by sampling resistor with earth terminal.

The driving full-bridge being made up of six N-channel MOS pipes of V1~V6 can control the energization of the winding of DC brushless motor State, conducting two-by-two and three or three two kinds of control modes of conducting can be divided into according to the step mode of power tube, due to turning on two-by-two Control mode provides bigger electromagnetic torque, the control mode turned on two-by-two can be used to be controlled in the present embodiment.Two Under the mode of two conductings, per there is two power tubes to turn in a flash, every the commutation of six/a cycle once, each power Pipe constant conduction 120, and phase current direction keeps constant during this period.

The turn-on sequence of six N-channel MOS pipes is that N-channel MOS pipe V1~V6 is sequentially turned on.That is N-channel MOS pipe V1 and V6 Turned in stage period 1, V1 and V2 are turned in stage second round, and V2 and V3 are turned in stage period 3, and V3 and V4 exist Stage period 4 is turned on, and V4 and V5 are turned in stage period 5, and V5 and V6 are turned in stage period 6, then cycle weight Above-mentioned conducting phase is answered, then three-phase coil is electrically charged in turn so that DC brushless motor is rotated.With reference to figure 3, control terminal GHA, GLC, GHB, GLA, GHC, GLB are followed successively by as N-channel MOS pipe V1~V6 control terminal, and SA, SB and SC respectively in order to N-channel MOS pipe V1, V3 and V5 provide reference voltage, ensure that gate-source voltage is poor, can be touched with N-channel MOS pipe V1, V3 and V5 Hair.

Optionally, sampling resistor includes four resistance in parallel, and with reference to figure 3, then protection module can be from collection voltages at point a Signal, to obtain the electric current on the coil of DC brushless motor.If specifically, obtaining voltage V1 from a points, in theory, there are public affairs Formula V 1=I*R/4.Wherein, I is the electric current for flowing through motor coil, and R is the resistance value of each resistance arranged side by side, magnitude of voltage V1 and electricity I direct proportionalities are flowed, then V1 can reflect the size of electric current on coil.

Optionally, switch module also includes fuse F1, the first N-channel MOS pipe, the 3rd N-channel MOS pipe and the 5th N ditches The first output end electrical connection of road metal-oxide-semiconductor is simultaneously electrically connected by fuse F1 with the first level output end VM, and fuse F1 is used for Overcurrent protection is carried out to circuit, when current is excessive, fuse F1 can disconnect on-off circuit and the first level output end VM company Connect.And the first level output end is grounded by the electric capacity C1 and C2 of parallel connection, and electric capacity C1 and C2 are used for burning voltage VM so that open Powered-down road obtains stable operating voltage.Exemplary, as shown in figure 3, fuse F1 model 0.1uF/50V, electric capacity C1 Can be 330uF/85V, electric capacity C2 can be 10A/125V.

Optionally, the N-channel MOS pipe can use model 039N06NS power tube, and the power tube through-current capability is big, Maximum can reach 100A, and radiating is good, is resistant to motor transient high-current completely, when fuse F1 reflections are not sensitive enough, The safety of power tube and on-off circuit can be ensured.

With reference to figure 4 and Fig. 5, Fig. 4 be the utility model embodiment provide driving chip and its peripheral circuit structure chart, Fig. 5 is the structural representation for another driven by Brush-Less DC motor control system that the utility model embodiment provides, optionally, Driving chip 2 includes：

Six signal output parts 41, respectively the control terminal with six N-channel MOS pipes of switch module 3 electrically connect, for controlling The turn-on and turn-off of N-channel MOS pipe processed；Hall input interface SENSE, is electrically connected with the Hall sensor of DC brushless motor 4, For obtaining the motor position information and rotary speed information of DC brushless motor 4；Hall output interface FG, first with single-chip microcomputer 1 Input 11 electrically connects, for treated motor position information and rotary speed information to be fed back into single-chip microcomputer；Direction controlling connects Mouthful DIR, is electrically connected with the first output end 12 of single-chip microcomputer 1, for obtain the direction control signal of single-chip microcomputer 1 with control direct current without The rotation direction of brush motor 4；Control for brake interface BRAKEZ, electrically connected with the second output end 13 of single-chip microcomputer 1, for obtaining list The brake control signal of piece machine 1 is with to the progress control for brake of DC brushless motor 4.

In Fig. 4, driving chip 2 describes by taking A4938 as an example to driving process, and A4938 chips are plug-in type, are easy to pacify Dress and integrated, driving chip 2 can also be that other have the chip of identical function in the present embodiment, the present embodiment to its without Limit, with reference to figure 4, driving chip 2 includes six signal output parts 41, six control terminal GHA respectively at switch module 3, GHB, GHC, GLA, GLB and GLC are electrically connected, and also include the other three voltage output end, be respectively used into Fig. 3 SA ends, SB ends and SC ends provide voltage to maintain power tube V1, V3 and V5 gate-source voltage poor, to ensure power tube V1, V3 and V5 Conducting.

Driving chip 2 obtains motor position information and rotary speed information by Hall access interface SENSE from Hall sensor Analog signal, and convert analog signals into data signal, and export to single-chip microcomputer 1, monolithic by Hall output interface FG Machine 1 is calculated according to similar PID formula, and motor speed and position are adjusted, and is controlled and driven by pulse control signal Dynamic chip 2, to carry out speed control to DC brushless motor 4.

In addition, driving chip 2 also includes some peripheral circuits, and it is exemplary with reference to figure 4, provide operating voltage for chip VM level etc..

Fig. 6 is the internal circuit configuration figure for the protection module that the utility model embodiment provides.Optionally, with reference to the He of figure 5 Fig. 6, protection module 5 include hysteresis comparing unit 51 and with gate circuit 52；

Hysteresis comparing unit 51 includes：Current detection voltage input VISEN, with the sampling resistor in switch module 3 One end away from earth terminal electrically connects, for obtaining current detection voltage；Reference voltage incoming end VRef, is electrically connected with reference level Connect, for obtaining reference voltage；Output end OUT is lagged, is electrically connected with the first input end IN1 with gate circuit 52, for exporting Lag output signal to gate circuit 52；

Electrically connected with the second input IN2 of gate circuit 52 with the 3rd output end 14 of single-chip microcomputer 1, for obtaining single-chip microcomputer 1 pwm pulse control signal, pwm pulse control signal and lag output signal are subjected to logic and operation with gate circuit 52, and By exporting operation result with the logic output terminal of gate circuit 52；The enabled control interface of logic output terminal and driving chip 2 ENABLE is electrically connected, for exporting enabled control signal to driving chip 2.

If sampling resistor is four resistance R in parallel, the current detection voltage input VISEN of comparing unit 51 is lagged The voltage of output is V1=I*R/4.The larger current value that settable DC brushless motor 4 can reach in normal operation On the basis of voltage, then what the current detection voltage V1 for measuring to obtain can not be excessively is more than this reference voltage, otherwise can be to power Pipe or circuit cause damage.The current detection voltage V1 and reference voltage of measurement are compared by hysteresis comparing unit 51, and When its difference is more than given threshold, low level is exported to the first input end IN1 with gate circuit 52 by lagging output end OUT. Electrically connected with the second output end IN2 of gate circuit 52 with the 3rd output end 14 of single-chip microcomputer 1, to obtain the pwm pulse of single-chip microcomputer 1 Control signal, the pwm pulse control signal and lag output signal of single-chip microcomputer 1 together control driving chip 2 to enter switch module 3 The pwm pulse signal of row triggering is sent.Specifically, pwm pulse control signal and lag output signal pass through logic and operation Electric signal afterwards, the enabled control interface ENABLE of driving chip 2 is delivered to, to control driving chip 2 to N-channel MOS pipe Control terminal 41 carry out turn-on and turn-off.If the difference of current detection voltage V1 and reference voltage is more than given threshold, lag Output end OUT exports low level, then pwm pulse control signal exports low electricity therewith mutually with exporting low level with gate circuit 52 It is flat.

If the model A4938 of driving chip 2, with reference to figure 4, then it is low level Enable Pin to enable control interface ENABLE, One phase inverter is then set between gate circuit 52 and enabled control interface ENABLE, when current detection voltage V1 is excessive, Input is high level to enabled control interface ENABLE, then A4938 can not export control of the pwm pulse signal to N-channel MOS pipe End 41 processed, then DC brushless motor 4 is out of service therewith, so as to which N-channel MOS pipe will not be damaged because electric current is excessive.

Optionally, also include with reference to figure 5 and Fig. 6, protection module 5：Reference voltage unit 53, passes through reference voltage output end Electrically connected with the reference voltage incoming end VRef for lagging comparing unit 51, reference voltage unit 53 includes voltage-stabiliser tube, for producing Reference level is simultaneously exported to hysteresis comparing unit 51 by reference voltage output end.

Optionally, comparator and the phase inverter of two series connection are included with reference to figure 6, hysteresis comparing unit 51；

Comparator obtains current detecting respectively by current detection voltage input VISEN and reference voltage incoming end VRef Voltage and reference voltage, comparator are electrically connected by output end with the input of two phase inverters connected, two series connection it is anti- The output end of phase device electrically connects with lagging the hysteresis output end OUT of comparing unit.

Comparing unit 51 is lagged in the present embodiment and employs comparator, comparator is used for current detection voltage and benchmark electricity Pressure is compared, and exports low level when current detection voltage is more than reference voltage, now reference voltage can be arranged into straight Flow maximum current detection magnitude of voltage during brushless electric machine normal work, after current detection voltage is more than reference voltage, output For low level to the phase inverter of two series connection, the phase inverter of series connection can play a part of shaping and balanced signal is delayed, and prevents straight Transient current is larger when stream brushless electric machine just starts, and causes driving chip 2 to miss and turns off switch module 3, stagnant in the present embodiment Comparing unit 51 can either prevent that motor working current is excessive afterwards, also can guarantee that the normal startup of motor, be DC brushless motor The normal operation of driving control system provides guarantee.

Pay attention to, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright Aobvious change, readjust and substitute without departing from the scope of protection of the utility model.Therefore, although passing through above example The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from In the case that the utility model is conceived, other more equivalent embodiments can also be included, and the scope of the utility model is by appended Right determine.

Claims (9)

1. a kind of driven by Brush-Less DC motor control system, it is characterised in that including single-chip microcomputer, driving chip, switch module, straight Flow brushless electric machine and protection module；

Wherein, single-chip microcomputer electrically connects with the driving chip, for outputing control signals to the driving chip；

The driving chip is electrically connected with the switch module, for output drive signal to the switch module, so that described Switch module drives the DC brushless motor；

Enable Pin of the protection module respectively with the DC brushless motor and the driving chip electrically connects, for obtaining Sample rate current during DC brushless motor work is stated, and when sample rate current is more than given threshold, passes through the driving chip Enable Pin forbids the driving chip output drive signal to the switch module；

Wherein, the switch module includes multiple N-channel MOS pipes.

2. driven by Brush-Less DC motor control system according to claim 1, it is characterised in that the single-chip microcomputer is additionally operable to The motor position information and rotary speed information for the DC brushless motor that the driving chip obtains are received, and according to the motor Positional information and rotary speed information are adjusted to the control signal.

3. driven by Brush-Less DC motor control system according to claim 1, it is characterised in that the DC brushless motor For three-phase direct-current brushless motor；

The switch module includes six N-channel MOS pipes, respectively the first N-channel MOS pipe, the second N-channel MOS pipe, the 3rd N Channel MOS tube, the 4th N-channel MOS pipe, the 5th N-channel MOS pipe and the 6th N-channel MOS pipe；

The first output end electrical connection of the first N-channel MOS pipe, the 3rd N-channel MOS pipe and the 5th N-channel MOS pipe and with the One level output end electrically connects, and the second output end is respectively the same as the 4th N-channel MOS pipe, the 6th N-channel MOS pipe and the 2nd N ditches While the first output end electrical connection of road metal-oxide-semiconductor, draw U output ends respectively, V output ends and W output ends, for respectively with institute State the three-phase windings coil electrical connection of three-phase direct-current brushless motor；

Second output end of the 4th N-channel MOS pipe, the 6th N-channel MOS pipe and the second N-channel MOS pipe is electrically connected and passed through Sampling resistor electrically connects with earth terminal.

4. driven by Brush-Less DC motor control system according to claim 3, it is characterised in that the sampling resistor includes Four resistance in parallel.

5. driven by Brush-Less DC motor control system according to claim 3, it is characterised in that the switch module also wraps Include fuse, the first output end electrical connection of the first N-channel MOS pipe, the 3rd N-channel MOS pipe and the 5th N-channel MOS pipe And electrically connected by the fuse with first level output end, the fuse is used to carry out the winding coil Stream protection.

6. driven by Brush-Less DC motor control system according to claim 3, it is characterised in that the driving chip bag Include：

Six signal output parts, respectively the control terminal with six N-channel MOS pipes of the switch module electrically connect, for controlling The turn-on and turn-off of the N-channel MOS pipe；

Hall input interface, electrically connected with the Hall sensor of the DC brushless motor, for obtaining the brush DC electricity The motor position information and rotary speed information of machine；

Hall output interface, electrically connected with the first input end of the single-chip microcomputer, for by treated motor position information The single-chip microcomputer is fed back to rotary speed information；

Direction controlling interface, electrically connected with the first output end of the single-chip microcomputer, for obtaining the direction controlling of the single-chip microcomputer Signal is to control the rotation direction of the DC brushless motor；

Control for brake interface, electrically connected with the second output end of the single-chip microcomputer, for obtaining the control for brake of the single-chip microcomputer Signal is with to DC brushless motor progress control for brake.

7. driven by Brush-Less DC motor control system according to claim 3, it is characterised in that the protection module includes Lag comparing unit and and gate circuit；

The hysteresis comparing unit includes：Sampling resistor in current detection voltage input, with the switch module it is remote One end electrical connection of earth terminal, for obtaining current detection voltage；Reference voltage incoming end, is electrically connected with reference level, is used for Obtain reference voltage；Output end is lagged, is electrically connected with the first input end with gate circuit, institute is outputed signal to for lag output State and gate circuit；

It is described to be electrically connected with the second input of gate circuit with the 3rd output end of the single-chip microcomputer, for obtaining the single-chip microcomputer Pwm pulse control signal, it is described that the pwm pulse control signal and the lag output signal are subjected to logic with gate circuit With computing, and by exporting operation result with the logic output terminal of gate circuit；The logic output terminal and the driving chip Enabled control interface electrical connection, for exporting enabled control signal to the driving chip.

8. driven by Brush-Less DC motor control system according to claim 7, it is characterised in that the protection module is also wrapped Include：Reference voltage unit, electrically connected by reference voltage output end with the reference voltage incoming end of the hysteresis comparing unit, institute Stating reference voltage unit includes voltage-stabiliser tube, for producing the reference level and being exported by the reference voltage output end to institute State hysteresis comparing unit.

9. driven by Brush-Less DC motor control system according to claim 7, it is characterised in that the hysteresis comparing unit Including comparator and two phase inverters connected；

The comparator obtains the electric current respectively by the current detection voltage input and the reference voltage incoming end Voltage and reference voltage are detected, the comparator is electrically connected by output end with the input of described two phase inverters connected, The output end of the phase inverter of described two series connection electrically connects with the hysteresis output end of the hysteresis comparing unit.