阅读说明：本技术 马达驱动电路及其控制方法 (Motor drive circuit and its control method ) 是由 萧稚宏 魏佳宾 李毓伟 曾伟硕 于 2018-05-16 设计创作，主要内容包括：本发明提供一种马达驱动电路及其控制方法。马达驱动电路包含第一驱动信号输出电路和第二驱动信号输出电路。马达驱动电路用以根据马达的运行功率是否超过功率阈值,选择性地自第一驱动信号输出电路输出六步方波驱动信号或自第二驱动信号输出电路输出空间向量驱动信号至变频器以驱动马达。第一驱动信号输出电路用以产生六步方波驱动信号。第二驱动信号输出电路用以产生空间向量驱动信号。(The present invention provides a kind of motor drive circuit and its control method.Motor drive circuit includes the first driving signal output circuit and the second driving signal output circuit.Motor drive circuit selectively exports six step square wave driving signals or from the second driving signal output circuit output space vector driving signal to frequency converter from the first driving signal output circuit whether to be more than power threshold according to the operation power of motor with drive motor.First driving signal output circuit is to generate six step square wave driving signals.Second driving signal output circuit is to generate space vector driving signal.)

1. a kind of motor drive circuit, includes:

One voltage signal generates unit, one motor of electric property coupling, to receive the motor position signal and a three-phase of the motor Current signal, and one group of ac-dc axis voltage letter is exported according to the motor position signal, the three-phase current signal and a current order Number with a motor electrical angle；

One first voltage signal adapter, to export a phase shift order and an amplitude according to this group of ac-dc axis voltage signal Order；And

One first driving signal generator, to be exported according to the phase shift order, the amplitude order and the motor electrical angle One control signal drives the motor to a frequency converter.

2. motor drive circuit as described in claim 1, wherein this group of ac-dc axis voltage signal includes shaft voltage signals always, The first voltage signal adapter is also to be multiplied by a ratio using as the phase shift order for the direct-axis voltage signal.

3. motor drive circuit as claimed in claim 2, wherein the first voltage signal adapter is also to reduce the d-axis The ratio of voltage signal -- integration control response, or to the direct-axis voltage signal carry out low-pass filtering after, multiplied by the ratio with As the phase shift order.

4. motor drive circuit as described in claim 1, wherein the voltage signal generates unit and includes:

One electrical angle calculator, is electrically coupled to the motor, to receive the motor position signal and be believed according to the motor position Number export the motor electrical angle.

5. motor drive circuit as described in claim 1, wherein the voltage signal generates unit and includes:

One current signal converter, is electrically coupled to the motor, to receive the three-phase current signal, and it is electrical according to the motor The three-phase current signal is converted to one group of ac-dc axis current signal by angle.

6. motor drive circuit as described in claim 1, wherein the voltage signal generates unit and includes:

One pi controller, electric property coupling first voltage signal adapter, to according to one group of ac-dc axis current signal And a current order, this group of ac-dc axis voltage signal is exported to the first voltage signal adapter.

7. a kind of motor drive circuit, includes:

One first driving signal output circuit, to generate one or six step square wave driving signals；

One second driving signal output circuit, to generate a space vector driving signal；

Wherein the motor drive circuit is to run power whether more than a power threshold, selectively certainly according to the one of a motor First driving signal output circuit exports the six steps square wave driving signal, or should from second driving signal output circuit output Space vector driving signal drives the motor to a frequency converter.

8. motor drive circuit as claimed in claim 7, wherein first driving signal output circuit includes:

One first voltage signal adapter, to export a phase shift according to one group of ac-dc axis voltage signal corresponding to the motor Dynamic order and an amplitude order；And

One first driving signal generator, the electric property coupling first voltage signal adapter, to according to the phase shift order, The amplitude order exports the six steps square wave driving signal with the motor electrical angle corresponding to the motor,

Wherein second driving signal output circuit includes:

One second voltage signal adapter, this group of ac-dc axis voltage signal is converted to a three-phase according to the motor electrical angle Voltage signal；And

One second driving signal generator, electric property coupling second voltage signal adapter, to according to the three-phase voltage signal Export the space vector driving signal.

9. motor drive circuit as claimed in claim 8, wherein this group of ac-dc axis voltage signal includes shaft voltage signals always, And the first voltage signal adapter is also to be multiplied by a ratio using as the phase shift order for the direct-axis voltage signal.

10. motor drive circuit as claimed in claim 9, wherein the first voltage signal adapter is also to reduce the d-axis The proportional plus integral control of voltage signal responds, or after carrying out low-pass filtering to the direct-axis voltage signal, multiplied by the ratio to make For the phase shift order.

11. motor drive circuit as claimed in claim 8, wherein first driving signal generator is also to by the phase shift Dynamic order is used as an angle commands after being added with the motor electrical angle, and generates six steps square wave driving letter according to the angle commands Number.

12. motor drive circuit as claimed in claim 7, also includes:

One electric appliance angle computer, electric property coupling motor, to receive a motor position signal and be believed according to the motor position Number output one motor electrical angle.

13. motor drive circuit as claimed in claim 7, also includes:

One current signal converter, is electrically coupled to the motor, to receive a three-phase current signal, and it is electrical according to a motor The three-phase current signal is converted to one group of ac-dc axis current signal by angle.

14. motor drive circuit as claimed in claim 7, also includes:

One pi controller, electric property coupling first driving signal output circuit and second driving signal output circuit, To receive one group of ac-dc axis current signal and a current order, and it is defeated according to this group of ac-dc axis current signal and the current order This group of ac-dc axis voltage signal is to first driving signal output circuit and second driving signal output circuit out.

15. motor drive circuit as claimed in claim 7, also to according to a motor temperature whether more than one first temperature threshold Value, a transducer power component temperature whether more than a second temperature threshold value or a motor noise whether more than a noise threshold, The six steps square wave driving signal or the space vector driving signal are selectively exported to the frequency converter to drive the motor.

16. a kind of motor drive circuit control method, includes:

One or six step square wave driving signals are exported by one first driving signal output circuit；

One space vector driving signal is exported by one second driving signal output circuit；

Whether one operation power of one motor is detected more than a power threshold by a motor drive circuit；

When the operation power is more than the power threshold, which is exported to a change by the motor drive circuit Frequency device is to drive the motor；And

When the operation power is less than the power threshold, which is exported by the motor drive circuit and extremely should Frequency converter is to drive the motor.

17. motor drive circuit control method as claimed in claim 16, wherein also including:

One phase shift is exported according to one group of ac-dc axis voltage signal corresponding to the motor by a first voltage signal adapter Order and an amplitude order；

By one first driving signal generator according to the phase shift order, the amplitude order and the motor for corresponding to the motor Electrical angle exports the six steps square wave driving signal；

This group of ac-dc axis voltage signal is converted to by a three-phase electricity according to the motor electrical angle by a second voltage signal adapter Press signal；And

The space vector driving signal is exported according to the three-phase voltage signal by one second driving signal generator.

18. motor drive circuit control method as claimed in claim 17, wherein also including:

The proportional plus integral control response of shaft voltage signals always is reduced by the first voltage signal adapter, or to the direct-axis voltage After signal carries out low-pass filtering, multiplied by a ratio using as the phase shift order, or by the first voltage signal adapter The direct-axis voltage signal is directly multiplied by the ratio using as the phase shift order.

19. motor drive circuit control method as claimed in claim 17, wherein also including:

An angle commands are used as after being added the phase shift order with the motor electrical angle by first driving signal generator, And the six steps square wave driving signal is generated according to the angle commands.

20. motor drive circuit control method as claimed in claim 16, wherein also including:

A motor temperature is detected whether more than one first temperature threshold；

A transducer power component temperature is detected whether more than a second temperature threshold value；

A motor noise is detected whether more than a noise threshold；

When the motor temperature be more than first temperature threshold or the transducer power component temperature be more than the second temperature threshold value or The motor noise be more than the noise threshold when, by the motor drive circuit export the six steps square wave driving signal to the frequency converter with Drive the motor；And

When the motor temperature is less than first temperature threshold or the transducer power component temperature is less than the second temperature threshold When value or the motor noise are less than the noise threshold, which is exported to the change by the motor drive circuit Frequency device is to drive the motor.

Technical field

This disclosure relates to a kind of driving circuit and its control method more particularly to a kind of motor drive circuit and its controls Method processed.

Background technique

As the technology of power electronics develops, motor drive circuit is widely used in various electronic motor fields.

In general, the driving method of motor is divided into space vector pulse width modulation (space-vector pulse Width modulation, SVPWM) mode and six step square waves (six-step square wave) mode.This both of which Control method it is different, and advantage and disadvantage are also different.

Therefore, a new motor drive circuit how is designed, is that an industry urgently solves thus with the advantages of both taking into account Certainly the problem of.

Summary of the invention

One embodiment of present disclosure is related to a kind of motor drive circuit, includes: voltage signal generates unit, first Voltage signal converter and the first driving signal generator.Voltage signal generates unit electric property coupling motor, to receive horse The motor position signal and three-phase current signal reached, and exported according to motor position signal, three-phase current signal and current order Ac-dc axis voltage signal and motor electrical angle.First voltage signal adapter is to according to ac-dc axis voltage signal output phase shift Dynamic order and amplitude order.First driving signal generator is to according to phase shift order, amplitude order and motor electrical angle Frequency converter is output control signals to drive motor.

One embodiment of present disclosure is related to a kind of motor drive circuit, includes: the first driving signal output circuit With the second driving signal output circuit.First driving signal output circuit is to generate six step square wave driving signals.Second driving Signal output apparatus is to generate space vector driving signal.Whether motor drive circuit according to the operation power of motor surpass Overpower threshold value selectively exports six step square wave driving signals from the first driving signal output circuit, or believes from the second driving Number output circuit output space vector driving signal is to frequency converter with drive motor.

Another embodiment of present disclosure is related to a kind of motor drive circuit control method, includes: by the first driving Signal output apparatus exports six step square wave driving signals；Space vector driving signal is exported by the second driving signal output circuit； Whether the operation power by motor drive circuit detection motor is more than power threshold；When running power more than power threshold, by Motor drive circuit exports six step square wave driving signals to frequency converter with drive motor；And when operation power is less than power-threshold When value, by motor drive circuit output space vector driving signal to frequency converter with drive motor.

Detailed description of the invention

Fig. 1 is the schematic diagram that a kind of motor drive circuit is painted according to the section Example of present disclosure；

Fig. 2 is the waveform that a kind of motor position signal and motor electrical angle are painted according to the section Example of present disclosure Schematic diagram；

Fig. 3 is the schematic diagram that a kind of driving signal generator is painted according to the section Example of present disclosure；

Fig. 4 A, 4B are that a kind of signal waveform schematic diagram is painted according to the section Example of present disclosure；

Fig. 5 is the schematic diagram that another motor drive circuit is painted according to the other parts embodiment of present disclosure；

Fig. 6 is the schematic diagram that another driving signal generator is painted according to the other parts embodiment of present disclosure；

Fig. 7 is the flow chart that a kind of motor drive circuit control method is painted according to the section Example of present disclosure.

Description of symbols:

100: motor drive circuit

110: voltage signal generates unit

112: electrical angle calculator

114: current signal converter

116: pi controller

120: first voltage signal adapter

130: the first driving signal output circuits

140: the first driving signal generators

150: the second driving signal output circuits

160: second voltage signal adapter

180: the second driving signal generators

200: motor

300: frequency converter

P: motor position signal

θ e: motor electrical angle

Ia, Ib, Ic: three-phase current signal

Id, Iq: ac-dc axis current signal

Icom: current order

Va, Vb, Vc: three-phase voltage signal

Vd, Vq: ac-dc axis voltage signal

Vcom: amplitude order

θ shift: phase shift order

CS: control signal

DS1: six step square wave driving signals

DS2: space vector driving signal

DS2_aH、DS2_bH、DS2_cH、DS2_aL、DS2_bL、DS2_cL、DS1_aH、DS1_aL、DS1_bH、DS1_ BL, DS1_cH, DS1_cL: power switch signal

PWM, PWM_aH, PWM_bH, PWM_cH, PWM_aL, PWM_bL, PWM_cL: square-wave pulse

700: motor drive circuit control method

S710~S770: step

Specific embodiment

It is hereafter to elaborate for embodiment cooperation Detailed description of the invention book, but described specific embodiment is only to explain This case is not used to limit this case, and the description of structure operation is non-to limit its sequence executed, any by element again group The structure of conjunction, the produced device with impartial technical effect, is all the range that present disclosure is covered.

Please refer to Fig. 1.Fig. 1 is the signal of the motor drive circuit 100 according to depicted in present disclosure section Example Figure.As shown in Figure 1, in some embodiments, 100 electric property coupling motor 200 of motor drive circuit and frequency converter 300, to According to motor position signal P and three-phase current signal Ia, Ib, Ic received from motor 200, the control of output control power switch Signal CS is to frequency converter 300 with drive motor 200.For example, motor drive circuit 100 can by central processing unit (CPU), Microcontroller (microcontroller unit, MCU), complexity programmable logic element (Complex Programmable Logic Device, CPLD), scene can programming lock array (Field-programmable gate array, FPGA) etc. Various mode implementations.

As shown in Figure 1, in some embodiments, motor drive circuit 100 includes that voltage signal generates unit 110 and the One driving signal output circuit 130.First driving signal output circuit 130 includes first voltage signal adapter 120 and the One driving signal generator 140, to according to ac-dc axis voltage signal Vd, Vq and motor electrical angle the θ e for corresponding to motor 200 Six step square wave driving signals are generated as control signal CS.In structure, voltage signal generates 110 electric property coupling motor 200 of unit With the first driving signal output circuit 130.120 the first driving signal generator of electric property coupling 140 of first voltage signal adapter. First driving signal generator, 140 electric property coupling frequency converter 300.

In some embodiments, it includes electrical angle calculator 112, current signal converter that voltage signal, which generates unit 110, 114 and pi controller 116.In structure, electrical angle calculator 112 is electrically coupled to motor 200, current signal converter 114 and first driving signal generator 140.Current signal converter 114 couples motor 200 and pi controller 116.Than Example 116 electric property coupling first voltage signal adapter 120 of integral controller.For explanation, about motor drive circuit 100 Specific detailed operation, the relevant drawings that will arrange in pairs or groups in the following paragraphs provide further instruction.

As shown in Figure 1, motor position signal P of the electrical angle calculator 112 to receive motor 200, and according to motor position Confidence P exports motor electrical angle θ e to current signal converter 114 and the first driving signal generator 140.

Specifically, please also refer to Fig. 2.Fig. 2 is that a kind of motor position is painted according to the section Example of present disclosure The waveform diagram of confidence P and motor electrical angle θ e.Lower waveform is electronic on the contrary with a in 200 inside three-phase of motor in figure Gesture (that is, the voltage of a phase to motor three-phase neutral point) represents motor position signal P.Upper waveform is for electrical angle calculating in figure The motor electrical angle θ e that device 112 is converted according to motor position signal P.As shown in Fig. 2, motor electrical angle θ e is with 0~360 degree for one The circulation in a period is changed as motor position signal P is synchronous.

As shown in Figure 1, three-phase current signal Ia, Ib, the Ic of current signal converter 114 to receive motor, and according to Three-phase current signal Ia, Ib, Ic are converted to ac-dc axis current signal Id, Iq by motor electrical angle θ e, and ac-dc axis electric current is believed Number Id, Iq are exported to pi controller 116.

Specifically, current signal converter 114 is by power component or directly captures three-phase current from three line of motor Signal Ia, Ib, Ic, and three-phase current signal Ia, Ib, Ic are converted into ac-dc axis current signal Id, Iq according to the following formula:

Wherein I_oFor the electric current of the neutral point of 200 three-phase of motor.Assuming that when three-phase equilibrium, I_oIt is approximately equal to 0.It is noticeable It is that above-mentioned formula is merely illustrative to be used, but present disclosure is not limited thereto, it is any by three-phase current signal Ia, Ib, Ic (three cordic phase rotators) is converted to the operation of ac-dc axis current signal Id, Iq (two-phase static coordinate), is all present disclosure institute The range covered.

Then, current signal converter 114 exports ac-dc axis current signal Id, Iq to pi controller 116.Such as Shown in Fig. 1, pi controller 116 is to export one group of friendship according to ac-dc axis current signal Id, Iq and current order Icom Direct-axis voltage signal Vd, Vq is to first voltage signal adapter 120.

Specifically, current order Icom includes direct-axis current order Id_com and quadrature axis current order Iq_com.Ratio Integral controller 116 exports direct-axis voltage signal Vd according to direct axis current signal Id and direct-axis current order Id_com, and according to Quadrature axis current signal Iq and quadrature axis current order Iq_com exports quadrature-axis voltage signal Vq.

In this way, which voltage signal generates the motor position signal P and three-phase current signal that unit 110 receives motor 200 Ia, Ib, Ic, and ac-dc axis voltage is exported according to motor position signal P, three-phase current signal Ia, Ib, Ic and current order Icom Signal Vd, Vq are to first voltage signal adapter 120.

Please continue to refer to Fig. 1.First voltage signal adapter 120 is to according to ac-dc axis voltage signal Vd, Vq output phase Position movement directive θ shift and amplitude order Vcom.Specifically, in some embodiments, first voltage signal adapter 120 Using quadrature-axis voltage signal Vq as amplitude order Vcom, and direct-axis voltage signal Vd is multiplied by a ratio K using as phase shift θ shift is ordered, wherein ratio K is any real number.

In addition, to avoid direct-axis voltage signal Vd from changing with biggish fluctuating ripple, in some embodiments, the first electricity After pressure signal adapter 120 is responded reducing the proportional plus integral control of direct-axis voltage signal Vd, multiplied by ratio K using as phase Position movement directive θ shift.In other parts embodiment, first voltage signal adapter 120 is to direct-axis voltage signal Vd After carrying out low-pass filtering, multiplied by ratio K using as phase shift order θ shift.For example, first voltage signal is converted Device 120 may include low-pass filter and proportional controller to realize aforesaid operations.

Accordingly, first voltage signal adapter 120 is turned respectively based on ac-dc axis voltage signal Vd, Vq that current feedback exports Phase shift order θ shift needed for being changed to six step square wave drive modes and amplitude order Vcom.

Please continue to refer to Fig. 1.First voltage signal adapter 120 is by phase shift order θ shift and amplitude order Vcom It exports to the first driving signal generator 140.First driving signal generator 140 to according to phase shift order θ shift, Amplitude order Vcom and motor electrical angle θ e output control signal CS is to frequency converter 300 with drive motor 200.

Specifically, control signal CS can be six step square wave driving signals, it includes the three-phases for respectively corresponding frequency converter 300 The power switch signal of six arms.As shown in figure 3, the first driving signal generator 140 is by phase shift order θ shift and motor Electrical angle θ e is used as angle commands θ com after being added, and is generated according to angle commands θ com by six step square-wave pulse generating elements Square-wave pulse signal PWM_aH, PWM_bH, PWM_cH, PWM_aL, PWM_bL, PWM_cL of upper and lower arms.In addition, first drives Dynamic signal generator 140 generates square-wave pulse signal PWM by comparator according to amplitude order Vcom and triangular wave.Then, root Pass through respectively with square-wave signal PWM according to square-wave signal PWM_aH, PWM_bH, PWM_cH of upper arm and lock (AND gate) carries out In six arm of three-phase of the AND logical operation to obtain frequency converter 300 upper arm power switched switch power switch signal DS1_aH, DS1_bH,DS1_cH.In addition, the three-phase according to square-wave signal PWM_aL, PWM_bL, PWM_cL of lower arm as frequency converter 300 Power switch signal DS1_aL, DS1_bL, DS1_cL of the power switched switch of lower arm in six arms.

In other parts embodiment, the first driving signal generator 140 also can according to the square-wave signal PWM_aL of lower arm, PWM_bL, PWM_cL pass through with square-wave signal PWM respectively and lock (ANDgate) carries out AND logical operation to obtain frequency converter 300 Six arm of three-phase in lower arm power switched switch power switch signal DS1_aL, DS1_bL, DS1_cL.In addition, according to upper Square-wave signal PWM_aH, PWM_bH, PWM_cH of arm are as the power switched switch of upper arm in six arm of three-phase of frequency converter 300 Power switch signal DS1_aH, DS1_bH, DS1_cH.Then, motor drive circuit 100 using this six steps square wave driving signal as It controls the control signal CS of power switch and exports control signal CS to frequency converter 300 with drive motor 200.

For example, as shown in Figure 4 A, waveform is from top to bottom respectively the upper arm that six step square-wave pulse generating elements generate With lower arm square-wave pulse signal PWM_aH, PWM_bH, PWM_cH, PWM_aL, PWM_bL, PWM_cL.As shown in Figure 4 B, the top For angle commands θ com, other waveforms are from top to bottom respectively under frequency converter 300a phase upper arm, a phase lower arm, b phase upper arm, b phase Power switch signal DS1_aH, DS1_aL, DS1_bH, DS1_bL, DS1_cH, DS1_cL of arm, c phase upper arm and c phase lower arm.In It is by taking 120 degree of six step square wave as an example in the present embodiment, therefore the width W that each signal is extended with central point both sides is 120 degree, But present disclosure is not limited thereto.In some embodiments, this width can be 90 degree or 180 degree.

In this way, motor drive circuit 100 can based on direct-axis voltage signal Vd be control phase shift and quadrature axis is electric Pressure signal Vq be control amplitude characteristic, reach generation six step square wave driving signal DS1 can make motor 200 current phase and Counter electromotive force phase close to space vector pulsed driving mode effect, to improve control to motor 200.

Please refer to Fig. 5.Fig. 5 is to be painted another motor drive circuit according to the other parts embodiment of present disclosure 100 schematic diagram.It is with identical component symbol table with similar element in the embodiment of Fig. 1 in embodiment illustrated in fig. 5 Show, operates in previous paragraph expositor, repeated no more in this.It is compared with embodiment illustrated in fig. 1, in the present embodiment, horse It also include the second driving signal output circuit 150 up to driving circuit 100.Second driving signal output circuit 150 includes the second electricity Signal adapter 160 and the second driving signal generator 180 are pressed, to generate according to ac-dc axis voltage signal and motor electrical angle Space vector driving signal.

In structure, 150 electric property coupling voltage signal of the second driving signal output circuit generates unit 110 and frequency converter 300. 160 the second driving signal generator of electric property coupling 180 of second voltage signal adapter, voltage signal generate the electricity in unit 110 Air horn calculator 112 and pi controller 116.Second driving signal generator, 180 electric property coupling second voltage signal turns Parallel operation 160 and frequency converter 300.In operation, second voltage signal adapter 160 is to electric by ac-dc axis according to motor electrical angle θ e Pressure signal Vd, Vq are converted to three-phase voltage signal Va, Vb, Vc.Second driving signal generator 180 according to three-phase voltage to believe Number Va, Vb, Vc export space vector driving signal DS2.

In this way, which whether motor drive circuit 100 can be more than power threshold according to the operation power of motor 200 (threshold value), selectively by the first driving signal generator 140 export six step square wave driving signal DS1 or It is used as control signal CS to frequency converter 300 with drive motor by 180 space vector driving signal DS2 of the second driving signal generator 200, the wherein selection mode, for example, can be in the first driving signal output circuit 130, the second driving signal output circuit The switching of output signal is done between 150 and frequency converter 300 using switch.

Specifically, ac-dc axis voltage signal Vd, Vq are converted to three-phase according to the following formula by second voltage signal adapter 160 Voltage signal Va, Vb, Vc:

Wherein V_oFor the voltage of the neutral point of 200 three-phase of motor.Assuming that when three-phase equilibrium, V_oIt is approximately equal to 0.It is noticeable It is that above-mentioned formula is merely illustrative to be used, but present disclosure is not limited thereto, it is any by ac-dc axis voltage signal Vd, Vq (two Phase static coordinate) operation that is converted to three-phase voltage signal Va, Vb, Vc (three cordic phase rotators) is all that present disclosure is contained The range of lid.

Then, three-phase voltage signal Va, Vb, Vc are exported to the second driving signal and are produced by second voltage signal adapter 160 Raw device 180.

Please also refer to Fig. 6.Fig. 6 is to be painted the second driving signal generator according to the section Example of present disclosure 180 schematic diagram.Specifically, space vector driving signal DS2 includes the power switch upper arm letter for respectively representing tri- arm of a, b, c Number DS2_aH, DS2_bH, DS2_cH and lower arm signal DS2_aL, DS2_bL, DS2_cL of complementation.As shown in fig. 6, second drives Dynamic signal generator 180 passes through comparator respectively according to three-phase voltage signal Va, Vb, Vc and triangle wave generates power switch Upper arm signal DS2_aH, DS2_bH, DS2_cH, and the lower arm signal DS2_ with upper arm signal corresponding complementary is generated with reverser aL、DS2_bL、DS2_cL。

In this way, which motor drive circuit 100 can be converted to ac-dc axis voltage signal Vd, Vq based on axis conversion formula Three-phase voltage signal Va, Vb, Vc, to generate space vector driving signal DS2 as control signal CS, and it is defeated to control signal CS Out to frequency converter 300 with drive motor 200.

As described in previous paragraph, whether motor drive circuit 100 can be more than power-threshold according to the operation power of motor 200 Value, selectively exports six step square wave driving signal DS1 or space vector driving signal DS2 to frequency converter 300 to drive horse Up to 200.In some embodiments, motor drive circuit 100 also to according to motor temperature whether more than the first temperature threshold, or Whether person is more than noise threshold according to motor noise, selectively exports six step square wave driving signal DS1 or space vector drives Dynamic signal DS2 is to frequency converter 300 with drive motor 200.In other parts embodiment, motor drive circuit 100 is also to root Whether be more than second temperature threshold value according to transducer power component temperature, selectively export six step square wave driving signal DS1 or Space vector driving signal DS2 is to frequency converter 300 with drive motor 200.

Specifically, in some embodiments, when the operation power of motor 200 is more than more than power threshold, motor temperature When first temperature threshold, transducer power component temperature are more than noise threshold more than second temperature threshold value or motor noise, horse Six step square wave driving signal DS1 are selectively exported up to driving circuit 100.Relatively, when the operation power of motor 200 is less than Power threshold, motor temperature are less than the first temperature threshold, transducer power component temperature is less than second temperature threshold value or When motor noise is less than noise threshold, motor drive circuit 100 selectively exports space vector driving signal DS2.

In this way, just can be when operation power is smaller, use space pulse vector drive mode, so that noise reduces, And keeps motor coil magnetic field orthogonal with magnetic field of magnets and generate torque capacity under unitary current.On the other hand, in operation power When larger or high temperature, using six step square wave drive modes, to reduce switching loss, and generated waste heat is reduced.

Please refer to Fig. 7.Fig. 7 is to be painted a kind of motor drive circuit control method according to the section Example of present disclosure 700 flow chart.For convenience and for the sake of clear explanation, following motor drive circuit control methods 700 are cooperation FIG. 1 to FIG. 7 institutes Show that embodiment is illustrated, but not limited to this, anyone skilled in the art, in the spirit and model for not departing from present disclosure In enclosing, when can be to making various variations and retouching.As shown in Fig. 7, motor drive circuit control method 700 include step S710, S720, S730, S740, S750, S760 and step S770.

Firstly, whether the operation power for detecting motor 200 by motor drive circuit 100 is more than power in step S710 Threshold value.

When motor 200 operation power be more than power threshold, then carry out step S720, S730 and step S740.In step In rapid S720, by first voltage signal adapter 120 according to ac-dc axis voltage signal Vd, Vq output phase for corresponding to motor 200 Position movement directive θ shift and amplitude order Vcom.

Then, in step S730, by the first driving signal generator 140 according to phase shift order θ shift, amplitude The motor electrical angle θ e of Vcom and motor 200 is ordered to export six step square wave driving signal DS1.

In other words, in step S720, S730, by the first driving signal output circuit 130 according to corresponding to motor 200 Ac-dc axis voltage signal Vd, Vq and motor electrical angle θ e exports six step square wave driving signal DS1.

Then, in step S740, six step square wave driving signal DS1 are exported to frequency converter 300 by motor drive circuit 100 With drive motor 200.

When the operation power of motor 200 is less than power threshold, then step S750, S760 and step S770 are carried out.In In step S750, ac-dc axis voltage signal Vd, Vq are converted to according to motor electrical angle θ e by second voltage signal adapter 160 Three-phase voltage signal Va, Vb, Vc.

Then, it in step S760, is exported by the second driving signal generator 180 according to three-phase voltage signal Va, Vb, Vc Space vector driving signal DS2.

In other words, in step S750, S760, by the second driving signal output circuit 150 according to ac-dc axis voltage signal Vd, Vq and motor electrical angle θ e export space vector driving signal DS2.

Then, in step S770, space vector driving signal DS2 is exported to frequency converter 300 by motor drive circuit 100 With drive motor 200.

Although disclosed method is shown and described as a series of step or event herein, but it is to be understood that institute The sequence of these steps or event for showing should not be construed as limited significance.For example, part steps can be occurred with different order And/or with other than illustrated herein and/or described step or event other steps or event occur simultaneously.In addition, When implementing one or more embodiments or embodiment described herein, and not all is all required the step of this shows. In addition, one or more steps herein may also execute the step of one or more separates and/or in the stage.

It should be noted that in the absence of conflict, in each attached drawing of present disclosure, embodiment and embodiment Feature can be combined with each other with circuit.Depicted circuit is merely illustrative in attached drawing is used, and is to simplify so that interest of clarity and just In understanding, not to limit this case.In addition, each device, unit and the element in the various embodiments described above can be by various types of The number or analog circuit of type are realized, can also be realized respectively by different IC wafers, or be integrated into single wafer.It is above-mentioned It only illustrates, present disclosure is not limited thereto.

In conclusion this case pass through application above-mentioned each embodiment in, according to the operation power of motor 200, motor temperature, Whether transducer power component temperature or motor noise are more than threshold value, and motor drive circuit 100 selectively exports six step square waves Driving signal DS1 or space vector driving signal DS2, enable motor 200 switched in the slow-speed of revolution or low noise space to Pulse-width-modulated mode is measured, switches to six step square wave patterns when high revolving speed or switch element heat rise.As a result, in operation function When rate is smaller, using space vector pulsed driving mode noise is reduced, and generate torque capacity.Operation power it is larger or When high temperature, using six step square wave drive modes, switching loss and waste heat are reduced.

Although present disclosure is disclosed as above with embodiment, so it is not limited to present disclosure, affiliated skill Art field technical staff is in the spirit and scope for not departing from present disclosure, when can make various variations and retouching, therefore this public affairs The protection scope of content is opened subject to view appended claims institute defender.