CN107404259B - A kind of brushless DC motor control circuit - Google Patents
A kind of brushless DC motor control circuit Download PDFInfo
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- CN107404259B CN107404259B CN201710723854.6A CN201710723854A CN107404259B CN 107404259 B CN107404259 B CN 107404259B CN 201710723854 A CN201710723854 A CN 201710723854A CN 107404259 B CN107404259 B CN 107404259B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
Abstract
The present invention relates to a kind of brushless DC motor control circuits, comprising: input filter, three-phase chopper circuit, high-frequency filter circuit, rectified three-phase circuit, buffering and leadage circuit, three phase inverter bridge, dsp controller, signal acquisition circuit and driving circuit；The present invention is using dsp controller as main control chip; without complicated software algorithm; brshless DC motor voltage is modulated using three-phase chopper circuit; without excessive inductance, motor torque ripple is reduced, is depressured in start-up course using AC chopping and three phase inverter bridge two-stage circuit; reduce electric motor starting electric current; electric motor starting reliability is improved, abnormal, exportable protection signal protection control single channel and motor occurs.
Description
Technical field
The present invention relates to motor control technology field more particularly to a kind of brushless DC motor control circuits.
Background technique
Brshless DC motor has many advantages, such as that structure is simple, small in size, power density is high, high-efficient, national defence, space flight,
The every field of the national economy such as aviation, automobile, household electrical appliances is used widely.Appearance and electronics member device with permanent-magnet material
The fast development of part, permanent-magnet brushless DC electric machine are more widely applied, small size, highly reliable brushless DC motor control circuit
One of key technology as brshless DC motor development.
Brushless DC motor control circuit mainly distinguishes two class modes at present, and the first kind is uncontrollable rectifier circuit and three contraries
Become the mode that bridge circuit is combined, carries out motor control by the way of directly modulation three phase inverter bridge bridge arm, this mode
Advantage is that controling circuit structure is simple, and easy to control, control algolithm is simple, the disadvantage is that due to directly modulating three phase inverter bridge bridge arm
Bring motor torque ripple increases, and serious, all smaller for the armature resistance and inductance high-speed motor of power tube fever opens
Dynamic reliability reduces；Second class is using uncontrollable rectifier circuit or controlled rectification circuit, dc chopper circuit and three contraries
Becoming the mode that bridge circuit is combined, advantage is that starting current is small, reduces motor torque ripple, and three phase inverter bridge is not necessarily to modulation,
Switching loss is reduced, the disadvantage is that making bus current be in on-off state using dc chopper, reduces motor power factor,
And for heavy-duty motor, DC chopper circuit is at high cost, volume is larger.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of brushless DC motor control circuit, brushless straight to solve
Flow the technical problem that circuit for controlling motor torque pulsation is high, volume is big, reliability is low.
The purpose of the present invention is mainly achieved through the following technical solutions:
Based in one embodiment of the present of invention, a kind of brushless DC motor control circuit is provided, comprising: three-phase is cut
Wave circuit, high-frequency filter circuit, rectified three-phase circuit, buffering and leadage circuit, three phase inverter bridge, dsp controller, signal acquisition
Circuit and driving circuit；Wherein Three-phase alternating current signal is connected to the input of three-phase chopper circuit after input filter filters
End, three-phase chopper circuit output voltage signal are connected to the input terminal of rectified three-phase circuit after high-frequency filter circuit filters, and three
Commutating phase circuit output DC voltage Ud is connected to the input terminal of buffering and leadage circuit, and buffering exports direct current with leadage circuit
Pressure Ud1 is connected to the input terminal of three phase inverter bridge, three phase inverter bridge output AC voltage to brshless DC motor, signal acquisition electricity
Road acquires the voltage and current signals of three phase inverter bridge, and Brushless DC Motor Position signal inputs the capture interface of dsp controller,
The output voltage and current signal of signal acquisition circuit are connected to the A D interface of dsp controller, the output of dsp controller PWM interface
Pwm signal and protection are signally attached to the input terminal of driving circuit, and driving circuit output drive signal S1-S6 is connected to three-phase and cuts
The control terminal of wave circuit, driving circuit output drive signal S7 are connected to the control terminal of buffering and leadage circuit, and driving circuit is defeated
Driving signal S8-S13 is connected to the control terminal of three phase inverter bridge out.
In another embodiment based on circuit of the present invention, input filter circuit includes: inductance L1, L2, L3, capacitor
C1,C2,C3；Three-phase electricity U phase output terminal is connect with the one end inductance L1, and V phase output terminal is connect with the one end inductance L2, W phase output terminal
Connect with the one end inductance L3, the other end of L1 is connect with one end of capacitor C1, the other end of tie point output signal U U1, L2 with
One end of capacitor C2 connects, and the other end of tie point output signal U V1, L3 are connect with one end of capacitor C3, tie point output letter
The other end of the other end of number UW1, C1 and C2, C3 the other end connect.
In another embodiment based on circuit of the present invention, three-phase chopper circuit include: power tube VT1, VT2, VT3,
VT4, VT5, VT6, the inside VT1 include anti-paralleled diode D1, include anti-paralleled diode D2 inside VT2, the inside VT3 is including anti-
Include anti-paralleled diode D4 inside parallel diode D3, VT4, includes anti-paralleled diode D5 inside VT5, include inside VT6
Anti-paralleled diode D6；The drain electrode of power tube VT1, the drain electrode connection of power tube VT3, the drain electrode of power tube VT5 are as input terminal
It is respectively connected to signal UU1, UV1, UW1, the source electrode of power tube VT1 is connect with the source electrode of power tube VT2, the source electrode of power tube VT3
It is connect with the source electrode of power tube VT4, the source electrode of power tube VT5 is connect with the source electrode of power tube VT6, grid, the function of power tube VT1
The grid of rate pipe VT2, the grid of power tube VT3, the grid of power tube VT4, the grid of power tube VT5, power tube VT6 grid
It is connect respectively with driving signal S1-S6 as control terminal；The drain electrode of power tube VT2, the drain electrode of power tube VT4, power tube VT6
Drain electrode difference output voltage signal UU2, UV2, UW2.
In another embodiment based on circuit of the present invention, high-frequency filter circuit includes: inductance L4, L5, L6, capacitor
C4,C5,C6；One end of L4, one end of L5, L6 one end be respectively connected to voltage signal UU2, UV2, UW2, the other end and electricity of L4
Hold one end connection of C4, the other end of tie point output signal U U3, L5 are connect with one end of capacitor C5, tie point output signal
The other end of UV3, L6 are connect with one end of capacitor C6, the other end of tie point output signal U W3, C4 and the other end, the C6 of C5
The other end connection.
In another embodiment based on circuit of the present invention, rectified three-phase circuit include: diode D14, D15, D16,
D17,D18,D19；Wherein, the cathode connection of the anode of diode D14, diode D17, anode, the diode of diode D15
The cathode of D18 connects, and the cathode connection of the anode, diode D19 of diode D16, three tie points are distinguished defeated as input terminal
Enter signal UU3, UV3, UW3；The cathode of diode D14 is connect with the cathode of the cathode of diode D15, diode D16, tie point
For the first output end of rectified three-phase circuit, anode and the anode of diode D18, the anode of diode D19 of diode D17 connects
It connects, tie point is the second output terminal of rectified three-phase circuit, the first output end and the second output terminal output of rectified three-phase circuit
DC voltage Ud.
In another embodiment based on circuit of the present invention, buffering with leadage circuit include: power tube VT7, resistance R1,
It include anti-paralleled diode D7 inside capacitor C7, power tube VT7；The drain electrode of power tube VT7 is connect with one end of C7, tie point with
First output end of rectified three-phase circuit connects, and the source electrode of power tube VT7 is connect with one end of resistance R1, the other end and C7 of R1
Other end connection, the second output terminal of tie point and rectified three-phase circuit connects, the grid of power tube VT7 as control terminal and
Driving signal S7 connection.
In another embodiment based on circuit of the present invention, three phase inverter bridge includes: voltage sensor VT, current sense
Device CT, power tube VT8, VT9, VT10, VT11, VT12, VT13, the inside VT8 includes anti-paralleled diode D8, includes inside VT9
Include anti-paralleled diode D10 inside anti-paralleled diode D9, VT10, include anti-paralleled diode D11 inside VT11, in VT12
Portion includes anti-paralleled diode D12, includes anti-paralleled diode D13 inside VT13；An input terminal of VT is with power tube VT7's
Drain electrode, one end of capacitor C7, the drain electrode of power tube VT8, the drain electrode of power tube VT9, the drain electrode of power tube VT10 connection, sensor
Another input terminal of VT is connect with an input terminal of the other end of R1, CT respectively, another input terminal of CT respectively with electricity
Hold the source electrode connection of the other end of C7, the source electrode of power tube VT11, the source electrode of power tube VT12, power tube VT13, VT output electricity
Press signal Volt, CT output current signal Cur, the grid of power tube VT8, the grid of power tube VT9, power tube VT10 grid
Pole, the grid of power tube VT11, the grid of power tube VT12, power tube VT13 grid as control terminal, respectively with driving believe
Number S8-S13 connection, the drain electrode of power tube VT11 are connect with the source electrode of power tube VT8, tie point output AC voltage UA, power
The drain electrode of pipe VT12 is connect with the source electrode of power tube VT9, tie point output AC voltage UB, the drain electrode of power tube VT13 and power
The source electrode of pipe VT10 connects, and tie point output AC voltage UC, described alternating voltage UA, UB, UC are respectively connected to brushless dc
The A phase, B phase, C phase of machine machine winding.
In another embodiment based on circuit of the present invention, brshless DC motor output position is signally attached to described
The capture interface of dsp controller, the A D interface of dsp controller and the output end of signal acquisition circuit connect, dsp controller PWM
Interface output drive signal P1-P13 and protection signal SD1, SD2 are connected to the input terminal of driving circuit.
In another embodiment based on circuit of the present invention, signal acquisition circuit includes: operational amplifier U8, U9, electricity
Hinder R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, capacitor C8, C9, C10, C11, operation amplifier
Device U8 is identical as U9, and operational amplifier U8 includes: U8A, U8B, U8C, and operational amplifier U9 includes: U9A, U9B, U9C；Electric current passes
One end of the output terminating resistor R3 of sensor CT, the other end and one end of resistance R4, one end of resistance R5, the operation of resistance R3 are put
The negative input end connection of big device U8B, the other end of resistance R4 are connect with the negative input end of operational amplifier U8A, operational amplifier
The positive input terminal of U8A is connect with one end of resistance R2, and the other end of resistance R2 is connect with reference voltage Ref, and resistance R5's is another
End is connect with one end of the output end of operational amplifier U8A, resistance R7, and one end of resistance R6 is just defeated with operational amplifier U8B's
Enter end connection, the other end of resistance R6 is connect with the power ground GND of operational amplifier U8, and the other end of resistance R7 is with capacitor C8's
One end connection of one end, resistance R8, the other end and one end of capacitor C9, the positive input terminal of operational amplifier U8C of resistance R8 connect
It connects, the other end of capacitor C9 is connect with the power ground GND of operational amplifier U8, the positive supply of operational amplifier U8 and direct current supply
The negative supply of power supply+VCC connection, operational amplifier U8 is connect with DC power supply-VCC, the other end of capacitor C8 and operation
The A D interface connection of the output end of amplifier U8C, the negative input end of operational amplifier U8C, dsp controller, voltage sensor VT
Output terminating resistor R10 one end, the other end of resistance R10 and one end of resistance R11, one end of resistance R13, operation amplifier
The negative input end of device U9B connects, and the other end of resistance R11 is connect with the negative input end of operational amplifier U9A, operational amplifier
The positive input terminal of U9A is connect with one end of resistance R9, and the other end of resistance R9 is connect with reference voltage Ref1, and resistance R13's is another
One end is connect with one end of the output end of operational amplifier U9A, resistance R14, and one end of resistance R12 is with operational amplifier U9B's
Positive input terminal connection, the other end of resistance R12 are connect with the power ground GND of operational amplifier U9, the other end and electricity of resistance R14
Hold one end connection of one end of C10, resistance R15, one end of the other end of resistance R15 and capacitor C11, operational amplifier U9C
Positive input terminal connection, the other end of capacitor C11 are connect with the power ground GND of operational amplifier U9, the positive electricity of operational amplifier U9
Source is connect with DC power supply+VCC, and the negative supply of operational amplifier U9 is connect with DC power supply-VCC, capacitor C10's
The other end is connect with the A D interface of the output end of operational amplifier U9C, the negative input end of operational amplifier U9C, dsp controller.
In another embodiment based on circuit of the present invention, driving circuit include: driving chip U1, U2, U3, U4, U5,
U6, U7, driving chip U1-U7 is identical, the PWM interface output drive signal P1-P13 and protection signal SD1 of dsp controller,
The input terminal H, the input terminal L, P3 that P2 inputs driving chip U1 that SD2, P1 input driving chip U1 input the defeated of driving chip U2
Enter and hold H, the input terminal L, the input terminal H, P6 that P5 inputs driving chip U3 that P4 inputs driving chip U2 input driving chip U3's
Input terminal L, the input terminal H, the input terminal H, P9 that P8 inputs driving chip U4 that P7 inputs driving chip U7 input driving chip U5
Input terminal H, the input terminal H, P11 that P10 inputs driving chip U6 input input terminal L, P12 the input driving core of driving chip U4
The input terminal L, SD1 of input terminal L, the P13 input driving chip U6 of piece U5 inputs the input terminal SD of driving chip U1, driving respectively
The input terminal SD of chip U2, the input terminal SD, SD2 of driving chip U3 input the input terminal SD of driving chip U4, driving core respectively
The input terminal SD of the input terminal SD of piece U5, the input terminal SD of driving chip U6, driving chip U7；The output end of driving chip U1
G1, G2, output end G1, G2 of driving chip U2, output end G1, G2 of driving chip U3, difference output drive signal S1-S6,
Output end G1, G2 of driving chip U4 distinguishes output drive signal S8 and S11, and output end G1, G2 difference of driving chip U5 is defeated
Output end G1, G2 of driving signal S9 and S12 out, driving chip U6 distinguish output drive signal S10 and S13, driving chip U7
Output end G1 output drive signal S7.
The present invention has the beneficial effect that:
The present invention uses dsp controller as main control chip, without complicated software algorithm, using three-phase chopper circuit pair
Brshless DC motor voltage is modulated, and without excessive inductance, is reduced motor torque ripple, is cut in start-up course using exchange
Wave and three phase inverter bridge two-stage circuit are depressured, and electric motor starting electric current is reduced, and improve electric motor starting reliability, exception occur,
Exportable protection signal protection control circuit and motor.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is one embodiment of the invention circuit diagram；
Fig. 2 is the circuit diagram of another embodiment of the present invention；
Fig. 3 is drive circuit schematic diagram；
Fig. 4 is signal acquisition circuit circuit diagram.
Wherein, 1: input filter circuit；2: three-phase chopper circuit；3: high-frequency filter circuit；4: rectified three-phase circuit；5: slow
Punching and leadage circuit；6: three phase inverter bridge；7:DSP controller；8: signal acquisition circuit；9: driving circuit.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
The embodiment of the present application provides a kind of brushless DC motor control circuit,
Specifically include as shown in Figure 1: input filter, three-phase chopper circuit, high-frequency filter circuit, rectified three-phase circuit,
Buffering and leadage circuit, three phase inverter bridge, dsp controller, signal acquisition circuit and driving circuit；Wherein Three-phase alternating current signal
UU, UV, UW are connected to the input terminal of input filter, and input filter output signal U U1, UV1, UW1 are connected to three-phase copped wave electricity
The input terminal on road, three-phase chopper circuit output voltage signal UU2, UV2, UW2 are connected to the input terminal of high-frequency filter circuit, high frequency
Filter circuit output signal U U3, UV3, UW3 are connected to the input terminal of rectified three-phase circuit, and rectified three-phase circuit exports direct current
Pressure Ud is connected to the input terminal of buffering and leadage circuit, and buffering is connected to three-phase inversion with leadage circuit output DC voltage Ud1
The input terminal of bridge, three phase inverter bridge output AC voltage UA, UB, UC are connected to brshless DC motor, the voltage of three phase inverter bridge
It is connected to the input terminal of signal acquisition circuit with current signal Volt, Cur, Brushless DC Motor Position signal HallA, HallB,
HallC is connected to the capture interface of dsp controller, and output signal Volt1, Cur1 of signal acquisition circuit is connected to DSP control
The A D interface of device, dsp controller PWM interface output pwm signal and protection are signally attached to the input terminal of driving circuit, driving electricity
Road output drive signal S1-S6 is connected to the control terminal of three-phase chopper circuit, and driving circuit output drive signal S7 is connected to slow
The control of punching and leadage circuit, driving circuit output drive signal S8-S13 are connected to the control of three phase inverter bridge.
In another embodiment of the present invention, as shown in Figure 2:
Input filter circuit includes: inductance L1, L2, L3, capacitor C1, C2, C3；Three-phase electricity U phase output terminal and inductance L1 mono-
End connection, V phase output terminal are connect with the one end inductance L2, and W phase output terminal is connect with the one end inductance L3, the other end and capacitor C1 of L1
One end connection, the other end of tie point output signal U U1, L2 connect with one end of capacitor C2, tie point output signal U V1,
The other end of L3 is connect with one end of capacitor C3, the other end of the other end of tie point output signal U W1, C1 and C2, C3 it is another
One end connection.
Three-phase chopper circuit includes: power tube VT1, VT2, VT3, VT4, VT5, VT6, includes two pole of inverse parallel inside VT1
Include anti-paralleled diode D2 inside pipe D1, VT2, include anti-paralleled diode D3 inside VT3, includes inverse parallel two inside VT4
Include anti-paralleled diode D5 inside pole pipe D4, VT5, includes anti-paralleled diode D6 inside VT6；The drain electrode of power tube VT1, function
Drain electrode connection, the drain electrode of power tube VT5 of rate pipe VT3 is respectively connected to signal UU1, UV1, UW1, power tube VT1 as input terminal
Source electrode connect with the source electrode of power tube VT2, the source electrode of power tube VT3 is connect with the source electrode of power tube VT4, power tube VT5's
Source electrode is connect with the source electrode of power tube VT6, the grid of power tube VT1, the grid of power tube VT2, power tube VT3 grid, function
The grid of rate pipe VT4, the grid of power tube VT5, power tube VT6 grid as control terminal respectively with driving signal S1-S6 connect
It connects；The drain electrode of power tube VT2, the drain electrode of power tube VT4, the drain electrode of power tube VT6 difference output voltage signal UU2, UV2,
UW2。
High-frequency filter circuit includes: inductance L4, L5, L6, capacitor C4, C5, C6；One end of L4, one end of L5, L6 one end
It is respectively connected to voltage signal UU2, UV2, UW2, the other end of L4 is connect with one end of capacitor C4, tie point output signal U U3, L5
The other end connect with one end of capacitor C5, the other end of tie point output signal U V3, L6 is connect with one end of capacitor C6, even
The other end connection of the other end, C6 of the other end and C5 of contact output signal U W3, C4.
Rectified three-phase circuit includes: diode D14, D15, D16, D17, D18, D19；Wherein, the anode of diode D14,
The cathode of diode D17 connects, the cathode connection of the anode, diode D18 of diode D15, the anode of diode D16, two poles
The cathode of pipe D19 connects, and three tie points distinguish input signal UU3, UV3, UW3 as input terminal；The cathode of diode D14 with
The cathode connection of the cathode, diode D16 of diode D15, tie point is the first output end of rectified three-phase circuit, diode
The anode of D17 is connect with the anode of the anode of diode D18, diode D19, and tie point is the second output of rectified three-phase circuit
End, the first output end and second output terminal of rectified three-phase circuit export DC voltage Ud.
Buffering includes: power tube VT7, resistance R1, capacitor C7 with leadage circuit, includes inverse parallel two inside power tube VT7
Pole pipe D7；The drain electrode of power tube VT7 is connect with one end of C7, the first output end connection of tie point and rectified three-phase circuit, function
The source electrode of rate pipe VT7 is connect with one end of resistance R1, and the other end of R1 and the other end of C7 connect, tie point and three phase rectifier electricity
The second output terminal on road connects, and the grid of power tube VT7 is connect as control terminal with driving signal S7.
Three phase inverter bridge includes: voltage sensor VT, current sensor CT, power tube VT8, VT9, VT10, VT11,
VT12, VT13, the inside VT8 include anti-paralleled diode D8, include anti-paralleled diode D9 inside VT9, the inside VT10 is including anti-
Include anti-paralleled diode D11 inside parallel diode D10, VT11, include anti-paralleled diode D12 inside VT12, in VT13
Portion includes anti-paralleled diode D13；An input terminal and the drain electrode of power tube VT7, one end of capacitor C7, power tube VT8 of VT
Drain electrode, the drain electrode of power tube VT9, the drain electrode of power tube VT10 connection, another input terminal of sensor VT is respectively with R1's
The input terminal connection of the other end, CT, another input terminal of CT source with the other end of capacitor C7, power tube VT11 respectively
The source electrode connection of pole, the source electrode of power tube VT12, power tube VT13, VT output voltage signal Volt, CT output current signal
Cur, the grid of power tube VT8, the grid of power tube VT9, the grid of power tube VT10, power tube VT11 grid, power tube
The grid of VT12, power tube VT13 grid as control terminal, connect respectively with driving signal S8-S13, the leakage of power tube VT11
Pole is connect with the source electrode of power tube VT8, tie point output AC voltage UA, the drain electrode of power tube VT12 and the source of power tube VT9
Pole connection, the drain electrode of tie point output AC voltage UB, power tube VT13 are connect with the source electrode of power tube VT10, tie point output
Alternating voltage UC.Alternating voltage UA, UB, UC are respectively connected to the A phase, B phase, C phase of brshless DC motor machine winding.
Dsp controller is specially dsp chip commonly used in the prior art, brshless DC motor output position signal HallA,
HallB, HallC are connected to the capture interface of dsp controller, the A D interface of dsp controller and the output end of signal acquisition circuit
Connection, dsp controller PWM interface output drive signal P1-P13 and protection signal SD1, SD2 are connected to the input of driving circuit
End.
Signal acquisition circuit include: operational amplifier U8, U9, resistance R2, R3, R4, R5, R6, R7, R8, R9, R10, R11,
R12, R13, R14, R15, capacitor C8, C9, C10, C11, operational amplifier U8 is identical as U9, operational amplifier U8 include: U8A,
U8B, U8C, operational amplifier U9 include: U9A, U9B, U9C；One end of the output terminating resistor R3 of current sensor CT, resistance
The other end of R3 is connect with the negative input end of one end of resistance R4, one end of resistance R5, operational amplifier U8B, and resistance R4's is another
One end is connect with the negative input end of operational amplifier U8A, and the positive input terminal of operational amplifier U8A is connect with one end of resistance R2,
The other end of resistance R2 is connect with reference voltage Ref, the other end of resistance R5 and output end, the resistance R7 of operational amplifier U8A
One end connection, one end of resistance R6 connect with the positive input terminal of operational amplifier U8B, the other end and operation amplifier of resistance R6
The power ground GND connection of device U8, the other end of resistance R7 are connect with one end of one end of capacitor C8, resistance R8, and resistance R8's is another
One end is connect with the positive input terminal of one end of capacitor C9, operational amplifier U8C, and the other end of capacitor C9 is with operational amplifier U8's
Power ground GND connection, the positive supply of operational amplifier U8 are connect with DC power supply+VCC, the negative supply of operational amplifier U8
It is connect with DC power supply-VCC, the output end of the other end of capacitor C8 and operational amplifier U8C, operational amplifier U8C
The A D interface connection of negative input end, dsp controller, one end of the output terminating resistor R10 of voltage sensor VT, resistance R10's
The other end is connect with the negative input end of one end of resistance R11, one end of resistance R13, operational amplifier U9B, and resistance R11's is another
End is connect with the negative input end of operational amplifier U9A, and the positive input terminal of operational amplifier U9A is connect with one end of resistance R9, electricity
The other end of resistance R9 is connect with reference voltage Ref1, the other end of resistance R13 and output end, the resistance R14 of operational amplifier U9A
One end connection, one end of resistance R12 connect with the positive input terminal of operational amplifier U9B, and the other end and the operation of resistance R12 is put
The power ground GND connection of big device U9, the other end of resistance R14 are connect with one end of one end of capacitor C10, resistance R15, resistance
The other end of R15 is connect with the positive input terminal of one end of capacitor C11, operational amplifier U9C, the other end of capacitor C11 and operation
The power ground GND connection of amplifier U9, the positive supply of operational amplifier U9 are connect with DC power supply+VCC, operational amplifier
The negative supply of U9 is connect with DC power supply-VCC, output end, the operation of the other end and operational amplifier U9C of capacitor C10
The A D interface connection of the negative input end, dsp controller of amplifier U9C.
Driving circuit includes: driving chip U1, U2, U3, U4, U5, U6, U7, and driving chip U1-U7 is identical, dsp controller
PWM interface output drive signal P1-P13 and protection signal SD1, SD2, P1 inputs the input terminal H of driving chip U1, P2 input
The input terminal L, the input terminal H, the input terminal L, P5 that P4 inputs driving chip U2 that P3 inputs driving chip U2 of driving chip U1 is defeated
The input terminal H, the input terminal L, P7 that P6 inputs driving chip U3 for entering driving chip U3 input the input terminal H, P8 of driving chip U7
The input terminal H, the input terminal H, P10 that P9 inputs driving chip U5 for inputting driving chip U4 input the input terminal H of driving chip U6,
The input terminal L, the input terminal L, P13 that P12 inputs driving chip U5 that P11 inputs driving chip U4 input the input of driving chip U6
L, SD1 is held to input the input terminal of the input terminal SD of driving chip U1, the input terminal SD of driving chip U2, driving chip U3 respectively
SD, SD2 input respectively the input terminal SD of driving chip U4, the input terminal SD of driving chip U5, driving chip U6 input terminal SD,
The input terminal SD of driving chip U7；Output end G1, G2 of output end G1, G2 of driving chip U1, driving chip U2, driving chip
Output end G1, G2 of U3, output drive signal S1-S6, output end G1, G2 of driving chip U4 distinguish output drive signal respectively
Output end G1, G2 of S8 and S11, driving chip U5 distinguish output drive signal S9 and S12, the output end G1 of driving chip U6,
G2 distinguishes output drive signal S10 and S13, the output end G1 output drive signal S7 of driving chip U7.
For different brshless DC motors, the armature inductance and armature resistance of motor are different, when the motor is energized, due to
Motor speed is very low, winding back emf very little, if the voltage being added on motor is without restriction, excessive electric current be may be damaged
Motor and control circuit, particularly with high-speed brushless DC electromotor, the armature inductance and armature resistance of motor are very small, more need
Motor is depressured to reduce electric motor starting electric current.When electric motor starting, dsp controller, which passes through, reads motor position signal,
The actual speed that motor is obtained using the motor position signal read in the set time, when motor speed is less than rated speed 5%
When, dsp controller output pwm signal P1-P6 to driving circuit, driving circuit output drive signal S1-S6 to three-phase copped wave electricity
Road reduce three-phase chopper circuit output voltage UU2, UV2, UW2, thus reduce high-frequency filter circuit output signal U U3, UU3,
UW3 reduces rectified three-phase circuit output DC voltage Ud, buffering and leadage circuit and exports DC voltage Ud1, to reduce three-phase
The input direct-current voltage of inverter bridge, achieve the purpose that reduce three phase inverter bridge output AC voltage UA, UB, UC, signal P1,
The duty ratio of P2, P3, P4, P5, P6 are 10%, after overdrive circuit, the duty ratio of signal S1, S2, S3, S4, S5, S6
It is 10%, at this point, when U phase is in positive axis, under the driving of signal S1, power tube VT2 is anti-in three-phase chopper circuit
Parallel diode D2 and power tube VT1 conducting, power tube VT2 is since the clamping action of diode D2 is in an off state, power
Pipe VT1 anti-paralleled diode D1 is turned off due to bearing back-pressure, when U phase is in negative semiaxis, under the driving of signal S2, and power
Pipe VT1 anti-paralleled diode D1 and power tube VT2 conducting, power tube VT1 are off shape due to the clamping action of diode D1
State, power tube VT2 anti-paralleled diode D2 is turned off due to bearing back-pressure, when V phase is in positive axis, in the driving of signal S3
Under, power tube VT4 anti-paralleled diode D4 and power tube VT3 conducting, power tube VT4 are in due to the clamping action of diode D4
Off state, power tube VT3 anti-paralleled diode D3 is turned off due to bearing back-pressure, when V phase is in negative semiaxis, in signal S4
Driving under, power tube VT3 anti-paralleled diode D3 and power tube VT4 conducting, power tube VT3 due to diode D3 clamper make
With in an off state, power tube VT4 anti-paralleled diode D4 is turned off due to bearing back-pressure, when W phase is in positive axis, In
Under the driving of signal S5, power tube VT6 anti-paralleled diode D6 and power tube VT5 conducting, power tube VT6 is due to diode D6's
Clamping action is in an off state, and power tube VT5 anti-paralleled diode D5 is turned off due to bearing back-pressure, when W phase is in negative half
When axis, under the driving of signal S6, power tube VT5 anti-paralleled diode D5 and power tube VT6 conducting, power tube VT5 is due to two
The clamping action of pole pipe D5 is in an off state, and power tube VT6 anti-paralleled diode D6 is turned off due to bearing back-pressure.Meanwhile
Dsp controller is electric to driving by the state output pwm signal P8-P13 for reading motor position signal HallA, HallB, HallC
Road, driving circuit output drive signal S8-S13 to three phase inverter bridge are modulated three-phase inversion bridge voltage, further decrease
Output AC voltage UA, UB, UC of three phase inverter bridge, to reduce the starting current of motor.If motor rotates forward, work as HallA
When for high level, HallB be low level, HallC is high level, the corresponding conducting of motor at this time is mutually A+ and B-, signal S8,
S12 duty ratio is equal to motor actual speed divided by 5% rated speed, and the duty ratio of signal S9, S10, S11, S13 are 0, power tube
VT8, VT12 switch modulation, the shutdown of power tube VT9, VT10, VT11, VT13 perseverance；When HallA is high level, HallB is low electricity
When flat, HallC is low level, the corresponding conducting of motor at this time is mutually A+ and C-, and it is practical that signal S8, S13 duty ratio is equal to motor
Revolving speed is 0 divided by 5% rated speed, the duty ratio of signal S9, S10, S11, S12, power tube VT8, VT13 switch modulation, power
The shutdown of pipe VT9, VT10, VT11, VT12 perseverance；When HallA is high level, HallB is high level, HallC is low level, at this time
The corresponding conducting of motor is mutually B+ and C-, and signal S9, S13 duty ratio is equal to motor actual speed divided by 5% rated speed, signal
The duty ratio of S8, S10, S11, S12 are 0, power tube VT9, VT13 switch modulation, power tube VT8, VT10, VT11, VT12 Heng Guan
It is disconnected；When HallA is low level, HallB is high level, HallC is low level, the corresponding conducting of motor at this time mutually for B+ and
A-, signal S9, S11 duty ratio are equal to motor actual speed divided by 5% rated speed, the duty ratio of signal S8, S10, S12, S13
It is 0, power tube VT9, VT11 switch modulation, the shutdown of power tube VT8, VT10, VT12, VT13 perseverance；When HallA be low level,
When HallB is high level, HallC is high level, the corresponding conducting of motor at this time is mutually C+ and A-, signal S10, S11 duty ratio
Equal to motor actual speed divided by 5% rated speed, the duty ratio of signal S8, S9, S12, S13 are 0, power tube VT10, VT11
Switch modulation, the shutdown of power tube VT8, VT9, VT12, VT13 perseverance；When HallA is low level, HallB is low level, HallC is
When high level, at this time motor it is corresponding conducting mutually be C+ and B-, signal S10, S12 duty ratio be equal to motor actual speed divided by
5% rated speed, the duty ratio of signal S8, S9, S11, S13 are 0, power tube VT10, VT12 switch modulation, power tube VT8,
The shutdown of VT9, VT11, VT13 perseverance；If motor reversal, when HallA is low level, HallB is high level, HallC is low level
When, the corresponding conducting of motor at this time is mutually A+ and B-, and signal S8, S12 duty ratio is equal to motor actual speed divided by 5% specified turn
Speed, the duty ratio of signal S9, S10, S11, S13 are 0, power tube VT8, VT12 switch modulation, power tube VT9, VT10, VT11,
The shutdown of VT13 perseverance；When HallA is low level, HallB is high level, HallC is high level, the corresponding conducting phase of motor at this time
For A+ and C-, signal S8, S13 duty ratio is equal to motor actual speed divided by 5% rated speed, signal S9, S10, S11, S12's
Duty ratio is 0, power tube VT8, VT13 switch modulation, the shutdown of power tube VT9, VT10, VT11, VT12 perseverance；When HallA is low electricity
When flat, HallB is low level, HallC is high level, the corresponding conducting of motor at this time is mutually B+ and C-, signal S9, S13 duty
Than being equal to motor actual speed divided by 5% rated speed, the duty ratio of signal S8, S10, S11, S12 are 0, power tube VT9,
VT13 switch modulation, the shutdown of power tube VT8, VT10, VT11, VT12 perseverance；When HallA is high level, HallB be low level,
When HallC is high level, the corresponding conducting of motor at this time is mutually B+ and A-, and signal S9, S11 duty ratio is equal to motor actual speed
Divided by 5% rated speed, the duty ratio of signal S8, S10, S12, S13 are 0, power tube VT9, VT11 switch modulation, power tube
The shutdown of VT8, VT10, VT12, VT13 perseverance；It is electric at this time when HallA is high level, HallB is low level, HallC is low level
The corresponding conducting of machine is mutually C+ and A-, and signal S10, S11 duty ratio is equal to motor actual speed divided by 5% rated speed, signal
The duty ratio of S8, S9, S12, S13 are 0, power tube VT10, VT11 switch modulation, power tube VT8, VT9, VT12, VT13 Heng Guan
It is disconnected；When HallA is high level, HallB is high level, HallC is low level, the corresponding conducting of motor at this time mutually for C+ and
B-, signal S10, S12 duty ratio are equal to motor actual speed divided by 5% rated speed, the duty ratio of signal S8, S9, S11, S13
It is 0, power tube VT10, VT12 switch modulation, the shutdown of power tube VT8, VT9, VT11, VT13 perseverance.
When motor speed is more than or equal to rated speed 5%, dsp controller is cut using given rotating speed according to position signal
The motor actual speed obtained is calculated, difference is carried out to obtain a given value of current value i* after PID is calculated, dsp controller is logical
The output signal Cur1 for crossing reading signal acquisition circuit obtains the electric current i of motor busM, dsp controller utilize given value of current value
I* subtracts the electric current i of motor busM, difference is carried out to obtain a numerical value d between 0~1 after PID is calculated, d is made
Duty ratio for signal P1, P2, P3, P4, P5, P6 is output to driving circuit, after overdrive circuit, signal S1, S2, S3,
The duty ratio of S4, S5, S6 are d, so that the output voltage of real-time control three-phase chopper circuit, turns to reach real-time control motor
The purpose of speed, in three-phase alternating current, when U phase is in positive axis, under the driving of signal S1, power tube VT2 inverse parallel two
Pole pipe D2 and power tube VT1 conducting, for power tube VT2 since the clamping action of diode D2 is in an off state, power tube VT1 is anti-
Parallel diode D1 is turned off due to bearing back-pressure, and when U phase is in negative semiaxis, under the driving of signal S2, power tube VT1 is anti-
Parallel diode D1 and power tube VT2 conducting, power tube VT1 is since the clamping action of diode D1 is in an off state, power
Pipe VT2 anti-paralleled diode D2 is turned off due to bearing back-pressure, when V phase is in positive axis, under the driving of signal S3, and power
Pipe VT4 anti-paralleled diode D4 and power tube VT3 conducting, power tube VT4 are off shape due to the clamping action of diode D4
State, power tube VT3 anti-paralleled diode D3 is turned off due to bearing back-pressure, when V phase is in negative semiaxis, in the driving of signal S4
Under, power tube VT3 anti-paralleled diode D3 and power tube VT4 conducting, power tube VT3 are in due to the clamping action of diode D3
Off state, power tube VT4 anti-paralleled diode D4 is turned off due to bearing back-pressure, when W phase is in positive axis, in signal S5
Driving under, power tube VT6 anti-paralleled diode D6 and power tube VT5 conducting, power tube VT6 due to diode D6 clamper make
With in an off state, power tube VT5 anti-paralleled diode D5 is turned off due to bearing back-pressure, when W phase is in negative semiaxis, In
Under the driving of signal S6, power tube VT5 anti-paralleled diode D5 and power tube VT6 conducting, power tube VT5 is due to diode D5's
Clamping action is in an off state, and power tube VT6 anti-paralleled diode D6 is turned off due to bearing back-pressure.
Meanwhile dsp controller passes through the state output pwm signal of reading motor position signal HallA, HallB, HallC
P8-P13 is to driving circuit, output drive signal S8-S13 to three phase inverter bridge, is lower than 5% phase of rated speed with motor speed
Than when motor speed is more than or equal to rated speed 5%, in the speed regulation process of motor, three-phase chopper circuit is realized alone pair
The dynamic modulation of electric moter voltage, three phase inverter bridge only realize commutation without being modulated, i.e. the conducting phase of three phase inverter bridge accounts for
Sky than it is permanent be 1, if motor rotates forward, when HallA is high level, HallB is low level, HallC is high level, motor at this time
Corresponding conducting is mutually A+ and B-, and signal S8, S12 duty ratio is 1, and the duty ratio of signal S9, S10, S11, S13 are 0, power tube
VT8, VT12 perseverance are open-minded, the shutdown of power tube VT9, VT10, VT11, VT13 perseverance；When HallA is high level, HallB be low level,
When HallC is low level, the corresponding conducting of motor at this time is mutually A+ and C-, and signal S8, S13 duty ratio is 1, signal S9, S10,
The duty ratio of S11, S12 are 0, and power tube VT8, VT13 perseverance is open-minded, the shutdown of power tube VT9, VT10, VT11, VT12 perseverance；When
When HallA is high level, HallB is high level, HallC is low level, the corresponding conducting of motor at this time is mutually B+ and C-, signal
S9, S13 duty ratio are 1, and the duty ratio of signal S8, S10, S11, S12 are 0, and power tube VT9, VT13 perseverance is open-minded, power tube VT8,
The shutdown of VT10, VT11, VT12 perseverance；When HallA is low level, HallB is high level, HallC is low level, motor pair at this time
The conducting answered mutually is B+ and A-, and signal S9, S11 duty ratio is 1, and the duty ratio of signal S8, S10, S12, S13 are 0, power tube
VT9, VT11 perseverance are open-minded, the shutdown of power tube VT8, VT10, VT12, VT13 perseverance；When HallA is low level, HallB be high level,
When HallC is high level, the corresponding conducting of motor at this time is mutually C+ and A-, and signal S10, S11 duty ratio is 1, signal S8, S9,
The duty ratio of S12, S13 are 0, and power tube VT10, VT11 perseverance is open-minded, the shutdown of power tube VT8, VT9, VT12, VT13 perseverance；When
When HallA is low level, HallB is low level, HallC is high level, the corresponding conducting of motor at this time is mutually C+ and B-, signal
S10, S12 duty ratio are 1, and the duty ratio of signal S8, S9, S11, S13 are 0, and power tube VT10, VT12 perseverance is open-minded, power tube
The shutdown of VT8, VT9, VT11, VT13 perseverance；If motor reversal, when HallA is low level, HallB is high level, HallC is low
When level, the corresponding conducting of motor at this time is mutually A+ and B-, and signal S8, S12 duty ratio is 1, signal S9, S10, S11, S13's
Duty ratio is 0, and power tube VT8, VT12 perseverance is open-minded, the shutdown of power tube VT9, VT10, VT11, VT13 perseverance；When HallA is low electricity
When flat, HallB is high level, HallC is high level, the corresponding conducting of motor at this time is mutually A+ and C-, signal S8, S13 duty
Than being 1, the duty ratio of signal S9, S10, S11, S12 is 0, and power tube VT8, VT13 perseverance is open-minded, power tube VT9, VT10, VT11,
The shutdown of VT12 perseverance；When HallA is low level, HallB is low level, HallC is high level, the corresponding conducting phase of motor at this time
For B+ and C-, signal S9, S13 duty ratio is 1, and the duty ratio of signal S8, S10, S11, S12 are 0, and power tube VT9, VT13 perseverance is opened
It is logical, the shutdown of power tube VT8, VT10, VT11, VT12 perseverance；When HallA is high level, HallB is low level, HallC is high level
When, the corresponding conducting of motor at this time is mutually B+ and A-, and signal S9, S11 duty ratio is 1, the duty of signal S8, S10, S12, S13
Than being 0, power tube VT9, VT11 perseverance is open-minded, the shutdown of power tube VT8, VT10, VT12, VT13 perseverance；When HallA be high level,
When HallB is low level, HallC is low level, the corresponding conducting of motor at this time is mutually C+ and A-, signal S10, S11 duty ratio
Be 1, the duty ratio of signal S8, S9, S12, S13 is 0, and power tube VT10, VT11 perseverance is open-minded, power tube VT8, VT9, VT12,
The shutdown of VT13 perseverance；When HallA is high level, HallB is high level, HallC is low level, the corresponding conducting phase of motor at this time
For C+ and B-, signal S10, S12 duty ratio is 1, and the duty ratio of signal S8, S9, S11, S13 are 0, and power tube VT10, VT12 are permanent
It is open-minded, the shutdown of power tube VT8, VT9, VT11, VT13 perseverance.
When motor in the process of running, dsp controller by the real-time output signal Volt1 for reading signal acquisition circuit and
Cur1 is more than limit value if there is Volt1 value, it was demonstrated that over-voltage occurs in three phase inverter bridge DC bus-bar voltage, and dsp controller will
Meeting output signal P7 generates driving signal S7 and is input to buffering and bleed-off circuit, busbar voltage is adjusted to driving circuit；
If overcurrent occurs in motor, the output signal Cur1 value of Acquisition Circuit will be more than limit value, and dsp controller is by output protection
Signal SD1, SD2, shutdown three-phase chopper circuit, buffering and bleed-off circuit, three phase inverter bridge, protect control circuit and motor not by
Damage.
The present invention has the beneficial effect that:
The present invention uses dsp controller as main control chip, without complicated software algorithm, using three-phase chopper circuit pair
Brshless DC motor voltage is modulated, and without excessive inductance, is reduced motor torque ripple, is cut in start-up course using exchange
Wave and three phase inverter bridge two-stage circuit are depressured, and electric motor starting electric current is reduced, and improve electric motor starting reliability, exception occur,
Exportable protection signal protection control circuit and motor.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of brushless DC motor control circuit characterized by comprising three-phase chopper circuit, high-frequency filter circuit, three-phase
Rectification circuit, buffering and leadage circuit, three phase inverter bridge, dsp controller, signal acquisition circuit and driving circuit；Wherein three-phase
Ac signal is connected to the input terminal of three-phase chopper circuit, three-phase chopper circuit output voltage letter after input filter filters
The input terminal of rectified three-phase circuit number is connected to after high-frequency filter circuit filters, rectified three-phase circuit exports DC voltage Ud and connects
It is connected to the input terminal of buffering and leadage circuit, buffering is connected to the defeated of three phase inverter bridge with leadage circuit output DC voltage Ud1
Enter end, three phase inverter bridge output AC voltage to brshless DC motor, signal acquisition circuit acquire three phase inverter bridge voltage and
Current signal, Brushless DC Motor Position signal input dsp controller capture interface, the output voltage of signal acquisition circuit and
Current signal is connected to the A D interface of dsp controller, and dsp controller PWM interface output pwm signal and protection are signally attached to drive
The input terminal of dynamic circuit, driving circuit output drive signal S1-S6 are connected to the control terminal of three-phase chopper circuit, and driving circuit is defeated
Driving signal S7 is connected to the control terminal of buffering and leadage circuit out, and driving circuit output drive signal S8-S13 is connected to three-phase
The control terminal of inverter bridge；
The buffering includes: power tube VT7, resistance R1, capacitor C7 with leadage circuit, includes inverse parallel two inside power tube VT7
Pole pipe D7；The drain electrode of power tube VT7 is connect with one end of C7, the first output end connection of tie point and rectified three-phase circuit, function
The source electrode of rate pipe VT7 is connect with one end of resistance R1, and the other end of R1 and the other end of C7 connect, tie point and three phase rectifier electricity
The second output terminal on road connects, and the grid of power tube VT7 is connect as control terminal with driving signal S7；
The output voltage of the signal acquisition circuit be more than limit value, dsp controller will output signal P7 arrive driving circuit, production
Raw driving signal S7 is input to buffering and bleed-off circuit, and three phase inverter bridge DC bus-bar voltage is adjusted.
2. circuit as described in claim 1, which is characterized in that the input filter circuit includes: inductance L1, L2, L3, capacitor
C1,C2,C3；Three-phase electricity U phase output terminal is connect with the one end inductance L1, and V phase output terminal is connect with the one end inductance L2, W phase output terminal
Connect with the one end inductance L3, the other end of L1 is connect with one end of capacitor C1, the other end of tie point output signal U U1, L2 with
One end of capacitor C2 connects, and the other end of tie point output signal U V1, L3 are connect with one end of capacitor C3, tie point output letter
The other end of the other end of number UW1, C1 and C2, C3 the other end connect.
3. circuit as claimed in claim 2, which is characterized in that the three-phase chopper circuit include: power tube VT1, VT2,
VT3, VT4, VT5, VT6, the inside VT1 include anti-paralleled diode D1, include anti-paralleled diode D2 inside VT2, wrap inside VT3
It includes anti-paralleled diode D3, includes anti-paralleled diode D4 inside VT4, include anti-paralleled diode D5 inside VT5, inside VT6
Including anti-paralleled diode D6；The drain electrode of power tube VT1, the drain electrode connection of power tube VT3, the drain electrode of power tube VT5 are as defeated
Enter end and be respectively connected to signal UU1, UV1, UW1, the source electrode of power tube VT1 is connect with the source electrode of power tube VT2, power tube VT3's
Source electrode is connect with the source electrode of power tube VT4, and the source electrode of power tube VT5 is connect with the source electrode of power tube VT6, the grid of power tube VT1
Pole, the grid of power tube VT2, the grid of power tube VT3, the grid of power tube VT4, the grid of power tube VT5, power tube VT6
Grid connect respectively with driving signal S1-S6 as control terminal；The drain electrode of power tube VT2, the drain electrode of power tube VT4, power
Output voltage signal UU2, UV2, UW2 are distinguished in the drain electrode of pipe VT6.
4. circuit as claimed in claim 3, which is characterized in that the high-frequency filter circuit includes: inductance L4, L5, L6, capacitor
C4,C5,C6；One end of L4, one end of L5, L6 one end be respectively connected to voltage signal UU2, UV2, UW2, the other end and electricity of L4
Hold one end connection of C4, the other end of tie point output signal U U3, L5 are connect with one end of capacitor C5, tie point output signal
The other end of UV3, L6 are connect with one end of capacitor C6, the other end of tie point output signal U W3, C4 and the other end, the C6 of C5
The other end connection.
5. circuit as claimed in claim 4, which is characterized in that the rectified three-phase circuit include: diode D14, D15,
D16,D17,D18,D19；Wherein, the cathode connection of the anode of diode D14, diode D17, the anode of diode D15, two poles
The cathode of pipe D18 connects, and the cathode connection of the anode, diode D19 of diode D16, three tie points are distinguished as input terminal
Input signal UU3, UV3, UW3；The cathode of diode D14 is connect with the cathode of the cathode of diode D15, diode D16, connection
Point is the first output end of rectified three-phase circuit, anode and the anode of diode D18, the anode of diode D19 of diode D17
Connection, tie point are the second output terminal of rectified three-phase circuit, and the first output end and second output terminal of rectified three-phase circuit are defeated
DC voltage Ud out.
6. circuit as described in claim 1, which is characterized in that the three phase inverter bridge includes: voltage sensor VT, and electric current passes
Sensor CT, power tube VT8, VT9, VT10, VT11, VT12, VT13, the inside VT8 include anti-paralleled diode D8, packet inside VT9
Anti-paralleled diode D9 is included, includes anti-paralleled diode D10 inside VT10, includes anti-paralleled diode D11, VT12 inside VT11
Inside includes anti-paralleled diode D12, includes anti-paralleled diode D13 inside VT13；An input terminal and power tube VT7 of VT
Drain electrode, one end of capacitor C7, the drain electrode of power tube VT8, the drain electrode of power tube VT9, the drain electrode of power tube VT10 connection, sensing
Another input terminal of device VT is connect with an input terminal of the other end of R1, CT respectively, another input terminal of CT respectively with
The source electrode connection of the other end of capacitor C7, the source electrode of power tube VT11, the source electrode of power tube VT12, power tube VT13, VT output
Voltage signal Volt, CT output current signal Cur, the grid of power tube VT8, the grid of power tube VT9, power tube VT10 grid
Pole, the grid of power tube VT11, the grid of power tube VT12, power tube VT13 grid as control terminal, respectively with driving believe
Number S8-S13 connection, the drain electrode of power tube VT11 are connect with the source electrode of power tube VT8, tie point output AC voltage UA, power
The drain electrode of pipe VT12 is connect with the source electrode of power tube VT9, tie point output AC voltage UB, the drain electrode of power tube VT13 and power
The source electrode of pipe VT10 connects, and tie point output AC voltage UC, described alternating voltage UA, UB, UC are respectively connected to brushless dc
The A phase, B phase, C phase of machine machine winding.
7. circuit as claimed in claim 6, which is characterized in that the brshless DC motor output position is signally attached to described
The capture interface of dsp controller, the A D interface of dsp controller and the output end of signal acquisition circuit connect, dsp controller PWM
Interface output drive signal P1-P13 and protection signal SD1, SD2 are connected to the input terminal of driving circuit.
8. circuit as claimed in claim 7, which is characterized in that the signal acquisition circuit include: operational amplifier U8, U9,
Resistance R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, capacitor C8, C9, C10, C11, operation are put
Big device U8 is identical as U9, and operational amplifier U8 includes: U8A, U8B, U8C, and operational amplifier U9 includes: U9A, U9B, U9C；Electric current
One end of the output terminating resistor R3 of sensor CT, the other end of resistance R3 and one end of resistance R4, one end of resistance R5, operation
The negative input end of amplifier U8B connects, and the other end of resistance R4 is connect with the negative input end of operational amplifier U8A, operation amplifier
The positive input terminal of device U8A is connect with one end of resistance R2, and the other end of resistance R2 is connect with reference voltage Ref, and resistance R5's is another
One end is connect with one end of the output end of operational amplifier U8A, resistance R7, and one end of resistance R6 and operational amplifier U8B are just
Input terminal connection, the other end of resistance R6 are connect with the power ground GND of operational amplifier U8, the other end and capacitor C8 of resistance R7
One end, resistance R8 one end connection, one end of the other end of resistance R8 and capacitor C9, operational amplifier U8C positive input terminal
Connection, the other end of capacitor C9 are connect with the power ground GND of operational amplifier U8, and the positive supply and direct current of operational amplifier U8 supplies
The negative supply of power supply+VCC connection, operational amplifier U8 is connect with DC power supply-VCC, the other end and fortune of capacitor C8
Calculate the A D interface connection of the output end of amplifier U8C, the negative input end of operational amplifier U8C, dsp controller, voltage sensor
One end of the output terminating resistor R10 of VT, the other end and one end of resistance R11, one end of resistance R13, the operation of resistance R10 are put
The negative input end connection of big device U9B, the other end of resistance R11 are connect with the negative input end of operational amplifier U9A, operational amplifier
The positive input terminal of U9A is connect with one end of resistance R9, and the other end of resistance R9 is connect with reference voltage Ref1, and resistance R13's is another
One end is connect with one end of the output end of operational amplifier U9A, resistance R14, and one end of resistance R12 is with operational amplifier U9B's
Positive input terminal connection, the other end of resistance R12 are connect with the power ground GND of operational amplifier U9, the other end and electricity of resistance R14
Hold one end connection of one end of C10, resistance R15, one end of the other end of resistance R15 and capacitor C11, operational amplifier U9C
Positive input terminal connection, the other end of capacitor C11 are connect with the power ground GND of operational amplifier U9, the positive electricity of operational amplifier U9
Source is connect with DC power supply+VCC, and the negative supply of operational amplifier U9 is connect with DC power supply-VCC, capacitor C10's
The other end is connect with the A D interface of the output end of operational amplifier U9C, the negative input end of operational amplifier U9C, dsp controller.
9. circuit as claimed in claim 8, which is characterized in that the driving circuit include: driving chip U1, U2, U3, U4,
U5, U6, U7, driving chip U1-U7 is identical, the PWM interface output drive signal P1-P13 and protection signal SD1 of dsp controller,
The input terminal H, the input terminal L, P3 that P2 inputs driving chip U1 that SD2, P1 input driving chip U1 input the defeated of driving chip U2
Enter and hold H, the input terminal L, the input terminal H, P6 that P5 inputs driving chip U3 that P4 inputs driving chip U2 input driving chip U3's
Input terminal L, the input terminal H, the input terminal H, P9 that P8 inputs driving chip U4 that P7 inputs driving chip U7 input driving chip U5
Input terminal H, the input terminal H, P11 that P10 inputs driving chip U6 input input terminal L, P12 the input driving core of driving chip U4
The input terminal L, SD1 of input terminal L, the P13 input driving chip U6 of piece U5 inputs the input terminal SD of driving chip U1, driving respectively
The input terminal SD of chip U2, the input terminal SD, SD2 of driving chip U3 input the input terminal SD of driving chip U4, driving core respectively
The input terminal SD of the input terminal SD of piece U5, the input terminal SD of driving chip U6, driving chip U7；The output end of driving chip U1
G1, G2, output end G1, G2 of driving chip U2, output end G1, G2 of driving chip U3, difference output drive signal S1-S6,
Output end G1, G2 of driving chip U4 distinguishes output drive signal S8 and S11, and output end G1, G2 difference of driving chip U5 is defeated
Output end G1, G2 of driving signal S9 and S12 out, driving chip U6 distinguish output drive signal S10 and S13, driving chip U7
Output end G1 output drive signal S7.
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| CN201710723854.6A CN107404259B (en) | 2017-08-22 | 2017-08-22 | A kind of brushless DC motor control circuit |
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| CN201710723854.6A CN107404259B (en) | 2017-08-22 | 2017-08-22 | A kind of brushless DC motor control circuit |
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| CN107404259B true CN107404259B (en) | 2019-11-29 |
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| CN117277221A (en) * | 2023-11-21 | 2023-12-22 | 泰兴市康森爱特传动设备科技有限公司 | Control device and control method for permanent magnet synchronous motor |
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| CN202918232U (en) * | 2012-08-01 | 2013-05-01 | 北京海斯德电机技术有限公司 | Soft start control system for high-speed brushless direct-current motor |
| CN103248291B (en) * | 2013-05-30 | 2015-09-09 | 北京航空航天大学 | A kind of high-speed brushless direct-current motor control system without position sensor |
| CN104167926A (en) * | 2014-08-10 | 2014-11-26 | 龚秋声 | AC voltage stabilization power supply for adjusting compensating voltages by means of AC chopper circuit |
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