CN102891641A - Motor driving device with function of adjusting rotating speed slope of motor - Google Patents

Abstract

A PWM modulation module can change the input PWM control signal so that the motor can achieve different speed applications under the same PWM control signal, thereby further increasing the flexibility of motor application; in addition, the PWM modulation module of the present invention is composed of a PWM modulation direction control circuit, a PWM modulation vector circuit and a PWM modulation signal generation circuit. Obviously, the PWM modulation module of the present invention is connected to a PWM control signal input from an external system and an external adjustment device, and through the setting of the adjustment device, the vector size and modulation direction of the PWM control signal are changed to adjust the pulse period of the PWM control signal.

Description

Motor drive with adjustable motor speed slope

technical field

The present invention relates to a motor driving device, in particular to a driving device capable of adjusting the slope of the motor speed, which uses a PWM modulating module capable of adjusting the PWM pulse to change the input PWM signal, so that the motor operates at the same Under the PWM input signal, the application of different speeds can be achieved, thereby further increasing the flexibility of motor application; in addition, the motor drive device of the present invention can be used in single-phase motors and three-phase motors.

Background technique

The traditional way of PWM controlling the motor drive is the duty (rotational speed) of the input PWM, which corresponds to the output duty of the motor, as shown in Figure 1A; for example: when the duty cycle of the PWM is 50%, Then the motor will output 50% of the speed. Therefore, the control curve of the motor speed will present a linear curve, as shown in FIG. 1B .

However, when the user wants to change the rotation speed of the motor according to the actual operating state; for example: when the temperature of the central processing unit (CPU) in the personal desktop computer or the NB motherboard increases, in order to achieve a rapid reduction The temperature of the central processing unit, which may require changing the input PWM pulse cycle (Duty Cycle), or changing the coil design of the motor, so that the motor can have a higher motor speed output under the same PWM pulse cycle; but in a In a well-matched and designed system, the above two methods have difficulties in their implementation and operation. For example: when you want to change the PWM pulse period input by the controller (that is, digital signal processor; DSP) according to the actual operating conditions, you must change the control mode of the entire system; and if you want to change the coil of the motor, you must replace it. motor.

In order to enable the PWM-controlled motor drive to have the function of changing the motor speed, the present invention aims at this application by adding a PWM-modulation block circuit (PWM-modulation block) to the PWM-controlled motor drive device to adjust the slope of the motor speed , to increase the adjustable mode in PWM control applications. In order to increase the application flexibility of the PWM control motor driving device to the motor speed control.

Contents of the invention

A main purpose of the present invention is to provide a PWM modulation module, whereby the PWM modulation module adjusts the input PWM control signal to achieve the function of adjusting the slope of the output speed of the motor.

Another main purpose of the present invention is to provide a PWM modulating module, whereby the PWM modulating module adjusts the input PWM control signal, so that the motor drive device with the PWM modulating module can be output according to different motor requirements, To adjust the motor speed slope to achieve different settings.

According to the above-mentioned purpose, the present invention first provides a motor drive device with a PWM modulation module, which is composed of a single-phase motor 30, a motor output unit 100 connected to the single-phase motor 30, a Hall voltage device 200, A Hall element 31 configured on the single-phase motor 30, and the Hall element 31 is connected to the Hall voltage device 200, and a PWM modulation module 300, wherein the PWM modulation module 300 includes: a PWM Modulation direction control circuit 310 (MDC), its input end is connected with an external adjustment device 400, and a first voltage is provided by the external adjustment device 400, and its other input end is connected with a reference voltage, the first voltage and the reference voltage After the voltages are compared, a potential signal is output; a PWM modulation vector circuit 320, its first input terminal is connected to the first voltage provided by the external adjustment device 400, and the first voltage is converted into a first current and then output, and its second The two input terminals are connected to the potential signal output by the PWM modulation direction control circuit 310 (MDC), so as to generate a modulation vector voltage after the PWM control signal 20 is triggered by a positive edge or a negative edge trigger, and then modulated The vector voltage is converted into a second current and output, and its third input terminal is connected to a PWM control signal 20; and a PWM modulation signal generation circuit 330 (MSG), its first input terminal is connected to the first current and the second current connection, its second input end is connected to the potential signal output by the PWM modulation direction control circuit 310 (MDC), and its third input end is connected to a PWM control signal 20 to output a pulse modulation signal ( MSG); wherein when the modulation signal (MSG) is triggered at the negative edge, it is the modulation signal (MSG) converted into a pulse after subtracting the second current from the first current, and the modulation signal (MSG) is output to Motor output unit 100; when the modulation signal (MSG) is triggered at the positive edge, it is the modulation signal (MSG) that is converted into a pulse after adding the first current to the second current, and outputs the modulation signal (MSG) to the motor output unit 100.

The present invention then provides a motor drive device with a PWM modulation module, which includes a three-phase motor 50, a three-phase motor drive unit 500 connected to the three-phase motor 50, and a PWM modulation module 300, wherein The PWM modulation module 300 includes: a PWM modulation direction control circuit 310 (MDC), its input end is connected with an external adjustment device 400, and the first voltage is provided by the external adjustment device 400, and its other input end is connected with a reference Voltage connection, after comparing the first voltage with the reference voltage, output a potential signal; a PWM modulation vector circuit 320, the first input terminal of which is connected to the first voltage provided by the external adjustment device 400, and converts the first voltage output after forming a first current, and its second input terminal is connected with the potential signal output by the PWM modulation direction control circuit 310 (MDC), so as to generate a PWM control signal 20 after positive-edge trigger or negative-edge trigger processing. Modulate the vector voltage, and then convert the modulated vector voltage into a second current for output, while its third input terminal is connected to a PWM control signal 20; and a PWM modulation signal generating circuit 330 (MSG), its first The input terminal is connected to the first current and the second current, the second input terminal is connected to the potential signal output by the PWM modulation direction control circuit 310 (MDC), and the third input terminal is connected to a PWM control signal 20, To output a pulse modulation signal (MSG); wherein when the modulation signal (MSG) is triggered on the negative edge, it is converted into a pulse modulation signal (MSG) after subtracting the second current from the first current, and Output the modulation signal (MSG) to the three-phase motor drive unit 500; when the modulation signal (MSG) is triggered on the positive edge, it is converted into the modulation of the pulse after adding the first current to the second current signal (MSG), and output the modulated signal (MSG) to the three-phase motor drive unit 500 . And the three-phase motor drive unit 500 is made up of a counter electromotive force detector 510, a phase rotation circuit 530 and a motor drive circuit 550, wherein the counter electromotive force detection circuit 510 is connected with the three-phase motor 50, in order to detect out The three phases (U, V, W) of the three-phase motor 50 are then sent to the phase rotation circuit 530 to be converted into a corresponding driving voltage, and then the driving voltage is output to the motor drive The circuit 550 further drives the external motor 50 .

Description of drawings

In order to illustrate the present invention more clearly, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings, wherein:

FIG. 1A is a schematic diagram of a conventional PWM control motor drive;

FIG. 1B is a schematic diagram of a curve driven by a conventional PWM control motor;

2A is a schematic diagram of the motor drive device of the present invention;

2B is a schematic circuit diagram of the external adjustment device in FIG. 2A of the present invention;

Fig. 3 is the schematic circuit diagram of the PWM modulation module of the present invention;

4A is a schematic diagram of the modulation signal (MSG) of the present invention when the control signal (MDC) is at a low potential;

4B is a schematic diagram of the modulation signal (MSG) of the present invention when the control signal (MDC) is at a high potential;

Figure 5 is a schematic diagram of the motor revolutions and drive cycle curves of the present invention; and

FIG. 6 is a schematic diagram of a motor drive device for a three-phase motor of the present invention.

Detailed ways

The present invention mainly discloses a motor drive device, especially a drive device capable of adjusting the slope of the motor speed, which uses a PWM modulation module that can adjust the PWM pulse to change the input PWM signal, so that the motor operates at the same Under the PWM input signal, the application of different speeds can be achieved, thereby further increasing the flexibility of the motor application. In addition, in order to clearly illustrate the operation process of the motor drive module of the present invention, in the following description process, a single-phase motor is used as an example for illustration; however, the application of the present invention is not limited to the application of single-phase motors. It can also be used in polyphase motor applications. At the same time, the single-phase motor or multi-phase motor to be driven by the motor drive module of the present invention is the same as the currently used motor, so in the following description, the driving method of the single-phase motor or the multi-phase motor will not be described in detail . In the following description, the PWM modulating module of the present invention is mainly disclosed in detail.

First, please refer to FIGS. 2A and 2B , which are schematic diagrams of the motor driving device of the present invention, wherein FIG. 2A is a functional block diagram of the motor driving device of the present invention; and FIG. 2B is a schematic diagram of the modulation circuit in FIG. 2A . As shown in FIG. 2A, the motor driving device 10 of the present invention includes an output unit 100 connected to a single-phase motor 30, a Hall element 31 configured on the single-phase motor 30, and a Hall element 31 for performing detection. Hall voltage device 200, and a PWM modulation module 300 with a slope for adjusting the motor speed; wherein the PWM modulation module 300 is composed of a PWM modulation direction control circuit 310 (PWM Modulation Direction Control Circuit; MDC), a PWM modulation Vector circuit 320 (PWM Modulation Vector Transfer Circuit; MVT) and a PWM modulation signal generation circuit 330 (PWM modulation signal generation Circuit; MSG). Obviously, the PWM modulation module 300 of the present invention is connected with a PWM control signal 20 input by an external system and an external adjustment device 400, and changes the vector size of the PWM control signal 20 by setting the adjustment device 400 and the direction of modulation, so as to adjust the pulse period (Duty Cycle) of the PWM control signal 20 . In this example, only a single-phase motor is used for illustration, and the drive of a three-phase motor is equally applicable to the present invention. At the same time, due to the main purpose of the Hall voltage device 200 of the present invention, in addition to providing the voltage required for the Hall element 31 to perform detection, it also needs to be further used to provide the bias voltage of the external adjustment device 400; therefore, the Hall voltage device 200 of the present invention The Hall voltage device 200 can be selectively configured in the motor drive device 10 of the present invention, or the Hall voltage device 200 is provided by an external voltage source of the motor drive device 10 of the present invention. The configuration of the motor drive device 10 in the present invention Not limited.

Please refer to Fig. 2B, the PWM modulation module 300 of the present invention is connected with a PWM control signal 20 input by an external system and an external adjustment device 400; wherein, the external system can be a digital signal processor (DSP) for outputting The PWM control signal 20 of a system; For example: the digital signal processor in the personal desktop computer or NB motherboard; The variable signal generation circuit 330 is connected. In addition, the external adjustment device 400 can be formed by a voltage divider circuit. One end of the external adjustment device 400 is connected to the Hall voltage device 200, and the other end is connected to the PWM modulation direction control circuit 310 and the PWM modulation direction control circuit 310 in the PWM modulation module 300. The PWM modulation vector circuit 320 is connected. In this embodiment, the external adjustment device 400 may be a voltage divider circuit formed by a plurality of electric groups to provide a voltage to the PWM modulation module 300 . Therefore, the present invention can achieve the function of adjusting the pulse cycle (Duty Cycle) of the PWM control signal 20 by setting the external adjustment device 400 .

Next, please refer to FIG. 3 , which is a schematic circuit diagram of the PWM modulation module of the present invention. As shown in FIG. 3 , the PWM modulation module 300 is composed of a PWM modulation direction control circuit 310 , a PWM modulation vector circuit 320 and a PWM modulation signal generation circuit 330 . Wherein the PWM modulation direction control circuit 310 is mainly composed of a comparator 315, one end of the comparator 315 is connected to a built-in potential V _ref , and the other end of the comparator 315 is connected in series with the external adjustment device 400 Resistors _R1 and _R2 are connected, wherein, one end of the resistor _{R1 is} connected to the Hall voltage device 200, and one end of the resistor _R2 is connected to _the ground point (GND); piezoelectric potential (VMS). This divided potential will be compared with the built-in potential V _ref . When the divided potential is greater than the built-in potential, the PWM modulation direction control circuit 310 will output a low-potential MDC signal through the comparator 315; otherwise, when the divided voltage When the bit is lower than the built-in potential, the PWM modulation direction control circuit 310 will output a high potential MDC signal through the comparator 315 . In addition, the voltage level of the above-mentioned divided potential has another function, which is used to determine the magnitude of the PWM modulation value. When the difference between the voltage level and the built-in potential V _ref is smaller, the formed PWM modulation value will be larger. On the contrary, when the difference between the voltage level and the built-in potential V _ref is larger, the PWM modulation amount formed is larger. Please refer to FIG. 3 to illustrate that the PWM modulation vector circuit 320 is composed of three voltage-to-current converters (V to I converter) and a positive and negative edge trigger selector 3240; wherein, in this embodiment, each voltage - The current converters 3210, 3220, 3230 can be formed by different current mirror (Current Mirror) circuits (the current mirror circuit is not shown in the figure); while the positive and negative edge trigger selector 3240 is formed by a time delay filter A time delay filter is used to generate a small positive and negative edge trigger pulse signal, plus some simple logic circuits to control the four switches S1-S4, to convert the input PWM control signal 20 according to different PWM After the pulses are converted into different modulation vector voltages, the modulation vector voltages are converted into I _F1 and I _F2 currents respectively via the third V to I converter 3230, and then passed to the currents in the PWM modulation signal generation circuit 330 Control circuit 3310, wherein the current values of I _F1 and I _F2 are the same.

The input end of the first voltage-to-current converter 3210 is connected to a built-in voltage to convert the voltage into a first fixed current (I _Vref ); and the input end of the second voltage-to-current converter 3220 is connected to a voltage of a built-in potential. The voltage division potential formed by the series resistors R ₁ and R ₂ in the external adjusting device 400 is connected to convert the voltage division potential (VMS) into a second fixed current (I _vms ). Then, the first fixed current (I _Vref ) and the second fixed current (I _vms ) generated by the first voltage-current converter 3210 and the second voltage-current converter 3220 will pass through a differential circuit 3250, and thus A differential circuit 3250 subtracts the first fixed current (I _Vref ) and the second fixed current (I _vms ) to generate a first current (I _diff ); after that, the first current (I _diff ) is an initial vector used to determine the size of the vector in the present invention; the current of the first current (I _diff ) is sent to the current control circuit 3310 in the PWM modulation signal generation circuit 330 respectively, namely, the marked I _A and I _{The B} current is sent to the current control circuit 3310, where the current values of I _A and I _B are the same.

Next, the current control circuit 3310 converts the PWM control signal 20, the control signal (MDC) of the PWM modulation direction control circuit 310, the I _F1 and I _F2 currents converted from the modulation vector voltage signal, and the I _A generated by the initial vector and I _B current after calculation, the current after the calculation is sent to the current-voltage conversion circuit 3320 (by a capacitor _C2 and a reverser-Inverter) for processing; that is, the current control circuit 3310 after the calculation The vector value is then converted into a MSG voltage modulation signal through the capacitor _C2 value in the current-voltage conversion circuit 3320, and finally the MSG voltage modulation signal is converted into a digital signal through an inverter, and then output to the motor output unit 100, to control the motor.

In addition, the input PWM control signal 20 and the control signal (MDC) of the PWM modulation direction control circuit 310 will also be input to the positive and negative edge trigger selector 3240 in the PWM modulation vector circuit 320 together; wherein, the PWM modulation vector The purpose of the control signal provided by the circuit 320 is mainly to process the input PWM control signal 20 to determine whether the PWM signal is triggered by a positive edge or a negative edge; as shown in FIG. 3 , when the control signal (MDC) is at a low potential , the switch S2 will be selectively turned on, and the switch S1 will be turned off at the same time; and when the low-potential control signal (MDC) is processed by the positive and negative edge trigger selector 3240, the negative edge trigger will be selected; at this time, The switch S3 is selectively turned on, and the switch S4 is turned off at the same time. Since, when the switch S3 is triggered by the negative edge, it is only turned on when the input PWM control signal 20 changes from a high potential to a low potential, and its main purpose is to pull the voltage of the capacitor _C1 to a built-in potential. as the initial value of the capacitor _C1 ; in addition, the switch S2 is continuously turned on when the control signal is maintained at a low potential. At this time, the voltage on the capacitor _C1 will be connected by the current , to perform a constant current discharge action; and the discharge time is determined by the input PWM control signal 20 being equal to the low potential time. As the duty cycle of the input PWM control signal 20 gradually increases, obviously, the time for discharging the capacitor _C1 will be shortened, so that the modulation vector voltage (MVT) remaining on the capacitor _C1 Then, the modulation vector voltage on the capacitor C ₁ passes through the third voltage-current converter 3230 to generate a second current; the second current will increase with the voltage on the capacitor C ₁ Afterwards, the PWM modulation vector circuit 320 will send the second current to the current control circuit 3310 in the PWM modulation signal generation circuit 330 respectively, that is, send _IF1 and _IF2 to the PWM modulation signal generation The circuit 330 is used as the compensation displacement of the modulation signal, wherein the current values of I _F1 and I _F2 are the same. Obviously, the compensation vector currents I _F1 and I _F2 outputted by the PWM modulation vector circuit 320 will gradually increase.

Please continue to refer to Figure 3. When the control signal (MDC) is at a high potential, the switch S1 will be selectively turned on, and the switch S2 will be turned off at the same time; and when the high potential control signal (MDC) passes through the positive and negative edge trigger selector After the 3240 is processed, it will select the positive edge trigger; at this time, the switch S3 will be selectively turned off and the switch S4 will be turned on at the same time; The control signal 20 is only turned on at the moment when the voltage level changes from low to high, and its main purpose is to pull the voltage on the capacitor _C1 to 0 potential (ie, the ground point GND) as the initial value of the capacitor _C1 . In addition, the switch S1 is continuously turned on when the control signal (MDC) is maintained at a high potential. At this time, the voltage on the capacitor _C1 will be charged with a constant current by the current connected to the switch S1. , is determined by the time when the input PWM control signal 20 is equal to the high potential. As the pulse period of the input PWM control signal 20 gradually increases, the charging time of the capacitor _C1 will become longer, so that the voltage remaining on the capacitor _C1 will gradually become higher, and the third voltage-current converter 3230 Afterwards, to generate a second current; this second current will gradually become larger as the voltage on the capacitor _C1 increases; after that, the PWM modulation vector circuit 320 will respectively send this second current to the PWM modulation signal The current control circuit 3310 in the generation circuit 330 sends I _F1 and I _F2 to the PWM modulation signal generation circuit 330 as the compensation displacement of the PWM modulation signal, wherein the current values of I _F1 and I _F2 are the same. Obviously, the compensation vector currents I _F1 and I _F2 of the modulation vector output by the PWM modulation vector circuit 320 will gradually become larger.

Next, please refer to FIG. 3 again, the PWM modulation signal generation circuit 330 is mainly composed of the first current provided by the PWM modulation vector circuit 320, the second current, the current control circuit 3310 and the current-voltage conversion circuit 3320; Wherein, the first current forms the current I _A and the current I _B respectively in the PWM modulation signal generating circuit 330 , and the second current forms the current I _F2 and the current I _F1 respectively in the PWM modulation signal generating circuit 330 . In addition, the input end of the current control circuit 3310 is connected to the PWM control signal 20, and the output end of the current control circuit 3310 is connected to the capacitor _C2 in the current-voltage conversion circuit 3320, and then passes through an inverter to output a MSG voltage modulation signal.

As shown in the PWM modulation signal generating circuit 330 of FIG. 3 , the current I _F2 and the current I _A are added; the current I _F1 and the current I _B are subtracted; in addition, the PWM modulation The control signal (MDC) output by the direction control circuit 310 is sent to the PWM modulation signal generation circuit 330, which is selected by the switch formed by the first transistor M1 and the second transistor M2 to perform the _IF2 + _IA action, or Execute the I _F1 -I _B action. In an embodiment of the present invention, when the control signal (MDC) output by the PWM modulation direction control circuit 310 is a low potential, the I _{F1 -IB} action is selected to be executed; otherwise, when the PWM modulation direction control circuit 310 When the output control signal (MDC) is at a high potential, the I _F2 + _IA action is selected to be executed; the detailed description is as follows.

As explained in the previous example, when the control signal (MDC) output by the PWM modulation direction control circuit 310 is a low potential (as shown in Figure 4A, MDC=L waveform), the current I _F1 will be transmitted by the PWM modulation vector circuit 320 to the PWM modulation signal generation circuit 330 and perform subtraction action with the current IB, and the current I _F1 will gradually increase as the pulse period of the input PWM control signal 20 conduction becomes larger (as shown in the PWM Signal in Fig. 4A waveform). In addition, when the pulse period of the input PWM control signal 20 is very small, the current I _F1 will also be very small, so when the current I _F1 is subtracted from the current I _B , a negative value will be obtained. At this time, it means that the capacitor _C2 The voltage will not be discharged; after passing through a current-voltage conversion circuit 3320, a modulation signal that is always at a low potential can be obtained (as shown in the first half of the MSG waveform in Figure 4A); then, when the input PWM control signal 20 After the conduction pulse period gradually increases, the current I _F1 will also gradually increase; so when the current I _F1 is greater than the current I _B , the current I _F1 minus the current I _B will be a positive value. Obviously, this When the current on the capacitor _C2 will be discharged through the current I _F1 , after passing through a current-voltage conversion circuit 3320, a small pulse will appear in the MSG voltage modulation signal, and this pulse will follow the current I _F1 gradually becomes larger, so that the wave pulse on the MSG voltage modulation signal will gradually become larger; when the PWM of the input PWM control signal 20 is 100%, its output will also be 100% turned on, as shown in Figure 4A The second half of the MSG voltage modulation signal waveform in is shown.

Conversely, when the control signal (MDC) output by the PWM modulation direction control circuit 310 is a high potential (MDC=H waveform in FIG. 4B ), the current I _F2 will be sent to the PWM by the PWM modulation vector circuit 320 The modulating signal generation circuit 330, and the action of adding to the current _IA , and the current _IF2 will become larger as the pulse period of the input PWM control signal 20 conduction becomes larger (as shown in the PWM Signal waveform in Figure 4B ). Similarly, when the pulse period of the input PWM control signal 20 is turned on is very small, the current _IF2 will also be very small, so when the current _IF2 is added to the current _IA , a positive value will be obtained, which means that the capacitor _C2 The voltage will be charged, but because the current I _F2 is still very small, so the charging current at this time is mainly the current I _A ; after passing through the current-voltage conversion circuit 3320, a modulation signal can be obtained (as shown in Figure 4B The first half of the MSG waveform in ), this MSG voltage modulation signal is formed by adding the input PWM control signal 20 to the modulation vector voltage (MVT); then, when the input PWM control signal 20 is turned on, the pulse period gradually changes After increasing, the current I _F2 will gradually become larger; therefore, when the current I _F2 is much larger than the current I _A , the current I _F2 + current I _A will be dominated by the current I _F2 , and the offset of the current I _A will gradually increase. will get smaller. At this time, the voltage on the capacitor _C2 will be charged by the current _IF2 + _IA , and after passing through a current-voltage conversion circuit 3320, the pulse signal output by the MSG voltage modulation signal is obtained, such as the MSG in Figure 4B shown in the second half of the waveform.

When the MSG voltage modulation signal is input to the output unit 100 , the pulse cycle of the modulation signal (MSG) drives the output circuit 110 and the output circuit 130 to provide current to the coil on the motor 30 to drive the motor 30 to rotate. At this time, the driving cycle curve of the rotational speed (RMS) of the motor 30 (RMS) and the modulation signal (MSG) is shown in FIG. 5 , and each control curve in FIG. 5 can be changed according to the magnitude of the external voltage division potential. For example: when the voltage division potential = 1.0V, the driving cycle curve of the motor speed and the modulation signal is shown in the first curve in Figure 5; when the voltage division potential = 0.4V, the motor speed and the driving cycle of the modulation signal The curve is shown in the second curve in Figure 5; when the voltage division potential=1.4V, the driving cycle curve of the motor speed and the modulation signal is shown in the third curve in Figure 5. Obviously, in this embodiment, when the voltage division potential is lowered, the slope of the driving cycle curve of the motor speed and the modulation signal will become smaller, so the motor speed will decrease; and when the voltage division potential is increased, the motor The slope of the driving cycle curve of the rotational speed and the modulation signal will become larger, so the motor rotational speed will increase. Therefore, the present invention can adjust the rotational speed of the motor according to the different heat dissipation requirements of the attached system (for example: personal desktop computer or NB motherboard) and through the magnitude of the divided voltage potential set by the external adjustment device 400 Slope, so it can increase the application flexibility of motor speed control. It should be particularly emphasized here that the above is one of the embodiments disclosed in the present invention, so it is not used to limit the implementation pattern in which the slope of the driving cycle curve becomes smaller when the voltage division potential is designed to be lower; in other words In other words, according to the content disclosed in the present invention, it is also possible to choose an implementation aspect in which the higher the voltage division potential is designed, the smaller the slope of the driving cycle curve will be; this is not limited by the present invention.

Next, please refer to FIG. 6 , which is a schematic diagram of a driving device for a three-phase motor of the present invention. As shown in Figure 6, the three-phase motor drive unit 500 of the present invention is composed of a back electromotive force detector 510, a phase rotation circuit 530, a motor drive circuit 550 and a voltage supply device 200'; wherein the back electromotive force detection circuit 510 Connect with three-phase motor 50, to detect three phases (U, V, W) of three-phase motor 50; The three phases of the motor 50 are converted into corresponding driving voltages; then the driving voltage is output to the motor driving circuit 550, and then the external motor 50 is driven; in addition, in the embodiment of the present invention, the three-phase motor 50 can also be a A three-phase motor 50 without inductive elements; the structure of the above-mentioned three-phase motor is the same as that of the traditional three-phase motor, so the detailed operation process will not be repeated.

The main technology of the present invention is to provide a PWM modulating module 300, the size of the voltage division potential set by an external adjustment device 400, so that the PWM modulation module 300 adjusts the input PWM control signal according to the size of the voltage division potential 20; wherein, one end of the external adjustment device 400 is connected to the voltage supply device 200' to generate a voltage division potential; and the PWM modulation module 300 outputs different modulation signals (MSG) according to the voltage division potential , so that the modulation signal (MSG) output by the PWM modulation module 300 is sent to the phase rotation circuit 530 in the three-phase motor drive unit 500, so that the motor drive circuit 550 of the three-phase motor can be adjusted according to the modulation signal (MSG) To adjust the motor speed slope to achieve different settings. Obviously, the circuit structure, control signal, and generated motor revolutions and driving cycle curves of the PWM modulating module 300 in this embodiment are all the same as those described above in FIGS. The detailed operation process will be described again.

The above descriptions for the preferred embodiments of the present invention are for clarifying the purpose of the present invention, and are not intended to limit the precise application form of the present invention. Therefore, within the spirit and scope of the present invention, all are determined by the above Described or covered by the embodiments of the present invention. Therefore, the technical idea of the present invention will be determined by the scope of the claims of the present invention and their equivalents.

Claims (10)

1. A motor drive device with a PWM modulation module, the motor drive device is composed of a motor, a motor output unit connected to the motor, and a PWM modulation module, wherein the PWM modulation module includes: A PWM modulation direction control circuit for outputting a potential signal; A PWM modulation vector circuit, connected to the potential signal of the PWM modulation direction control circuit and a PWM control signal, for converting a PWM control signal into a modulation vector voltage; and A PWM modulation signal generating circuit, connected to the potential signal and the PWM control signal of the PWM modulation direction control circuit to output a voltage modulation signal; wherein The voltage modulation signal is calculated by a current control circuit and a current-voltage conversion circuit, the calculated current is converted into the current-voltage conversion circuit, and the current-voltage conversion circuit is output to the motor output unit . 2 . The motor driving device with a PWM modulation module as claimed in claim 1 , wherein the potential signal output by the PWM modulation direction control circuit is compared with the first voltage and a reference voltage through a comparator. 3. The motor drive device with a PWM modulation module as claimed in claim 1, wherein the external adjustment device is a voltage divider circuit formed by a plurality of resistors, and one end of the external adjustment device is connected to a voltage device to generate the first voltage. 4. The motor driving device with a PWM modulation module as claimed in claim 1, wherein the PWM modulation vector circuit is composed of at least three voltage-current converters, a differential circuit and a time delay filter. 5. The motor drive device with a PWM modulating module as claimed in claim 4, wherein an input terminal of the first voltage-current converter is connected to the reference voltage to convert the reference voltage into a first fixed current, The input terminal of the second voltage-current converter is connected to the first voltage and converted into a second fixed current, and the first fixed current and the second fixed current are passed through the differential circuit to generate the first output after the current. 6. The motor drive device with a PWM modulation module as claimed in claim 4, wherein an input terminal of the third voltage-current converter is connected to the modulation vector voltage, and converts the modulation vector voltage into a first Output after the second current. 7. The motor driving device with a PWM modulation module as claimed in claim 6, wherein the three voltage-current converters are all formed by current mirror circuits. 8. The motor drive device with a PWM modulation module as claimed in claim 1, wherein the current control circuit controls the output voltage of the PWM modulation direction control circuit through a switch formed by a first transistor and a second transistor. The potential signal is used to perform negative-edge triggering, so that the first current subtracts the second current, or when performing positive-edge triggering, to make the first current add the second current. 9. A motor drive device with a PWM modulation module, the motor drive device includes a three-phase motor, a three-phase motor drive unit connected to the three-phase motor, and a PWM modulation module, wherein the PWM Modulation modules include: A PWM modulation direction control circuit, one input end of which is connected to an external adjustment device, and a first voltage is provided by the external adjustment device, and the other input end is connected to a reference voltage, and the first voltage is connected to the reference voltage After the voltage comparison, output a potential signal; A PWM modulation vector circuit, the first input end of which is connected to the first voltage provided by the external adjustment device, and converts the first voltage into a first current and then outputs it, and its second input end is connected to the PWM modulation The potential signal output by the direction control circuit is connected, and its third input terminal is connected with a PWM control signal to convert a PWM control signal into a modulation vector voltage, and then convert the modulation vector voltage into a second current post output; and A PWM modulation signal generation circuit, its first input end is connected with the first current and the second current, its second input end is connected with the potential signal output by the PWM modulation direction control circuit, and its third input The terminal is connected with a PWM control signal to output a voltage modulation signal; wherein The voltage modulation signal is calculated by a current control circuit and a current-voltage conversion circuit, the calculated current is converted into the current-voltage conversion circuit, and the current-voltage conversion circuit is output to the three-phase motor Drive unit. 10. The motor drive device with a PWM modulation module as claimed in claim 9, wherein the three-phase motor drive unit is composed of a back electromotive force detector, a phase rotation circuit and a motor drive circuit, the back electromotive force detector The detection circuit is connected with the three-phase motor to detect the three phases of the three-phase motor, and then send the three phases to the phase rotation circuit to convert into corresponding driving voltage, and then drive the The voltage is output to the motor drive circuit to drive an external motor.

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