CN218514302U - Motor drive circuit and electric appliance - Google Patents

Abstract

The present disclosure relates to a motor drive circuit and an electric appliance. Wherein, motor drive circuit includes: the first end of the voltage regulating module is electrically connected with the positive electrode of the alternating current power supply, the second end of the voltage regulating module is electrically connected with the negative electrode of the alternating current power supply, and the third end of the voltage regulating module is electrically connected with the first direct current power supply; the voltage regulating module is used for regulating the voltage of the first direct current power supply through the alternating current voltage of the alternating current power supply and outputting the voltage to the first end of the motor through the second end of the voltage regulating module; the half-bridge drive module, half-bridge drive module's first end and first DC power supply electricity are connected, and half-bridge drive module's second end is connected with the earthing terminal electricity, and half-bridge drive module is used for based on first control signal and second control signal, to the voltage of the second end output first DC power supply of motor or the voltage of earthing terminal. Thus, the number of switching elements can be reduced, thereby reducing cost and simplifying circuit structure.

Description

Motor drive circuit and electric appliance

Technical Field

The disclosure relates to the technical field of motor drive, in particular to a motor drive circuit and an electric appliance.

Background

The motor is an electromagnetic device for realizing electric energy conversion or transmission according to the electromagnetic induction law, wherein the permanent magnet synchronous motor omits an excitation device, simplifies the structure and improves the efficiency, so the permanent magnet synchronous motor is widely applied to electric appliances such as fans, washing machines and the like.

At present, for a single-phase permanent magnet synchronous motor, a driving circuit of the single-phase permanent magnet synchronous motor comprises an upper bridge driving module, a lower bridge driving module and the like, wherein the upper bridge driving module comprises an upper bridge driving unit and an upper bridge switching element, the lower bridge driving module comprises a lower bridge driving unit and a lower bridge switching element, an upper bridge control signal is amplified by the upper bridge driving unit to generate a driving current to drive the upper bridge switching element to be switched on/off, and a lower bridge control signal is amplified by the lower bridge driving unit to generate the driving current to drive the lower bridge switching element to be switched on/off. In this scheme, the number of switching elements is large, which results in high cost and complicated circuit design.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the present disclosure provides a motor driving circuit and an electrical appliance.

In a first aspect, the present disclosure provides a motor drive circuit comprising: the first end of the voltage regulating module is electrically connected with the positive electrode of the alternating current power supply, the second end of the voltage regulating module is electrically connected with the negative electrode of the alternating current power supply, and the third end of the voltage regulating module is electrically connected with the first direct current power supply; the voltage regulating module is used for regulating the voltage of the first direct current power supply through the alternating current voltage of the alternating current power supply and outputting the voltage to the first end of the motor through the second end of the voltage regulating module;

the half-bridge drive module, half-bridge drive module's first end and first DC power supply electricity are connected, and half-bridge drive module's second end is connected with the earthing terminal electricity, and half-bridge drive module is used for based on first control signal and second control signal, to the voltage of the second end output first DC power supply of motor or the voltage of earthing terminal.

In a second aspect, the present disclosure provides an electrical appliance comprising: any of the motor drive circuits in the embodiments of the present disclosure.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the motor drive circuit of the embodiment of the present disclosure includes: the first end of the voltage regulating module is electrically connected with the positive electrode of the alternating current power supply, the second end of the voltage regulating module is electrically connected with the negative electrode of the alternating current power supply, and the third end of the voltage regulating module is electrically connected with the first direct current power supply; the voltage regulating module is used for regulating the voltage of the first direct current power supply through the alternating current voltage of the alternating current power supply and outputting the voltage to the first end of the motor through the second end of the voltage regulating module; the half-bridge drive module, half-bridge drive module's first end and first DC power supply electricity are connected, and half-bridge drive module's second end is connected with the earthing terminal electricity, and half-bridge drive module is used for based on first control signal and second control signal, to the voltage of the second end output first DC power supply of motor or the voltage of earthing terminal. Therefore, according to the technical solution provided by the embodiment of the present disclosure, the motor driving circuit needs a half-bridge driving module, and compared with the related art that a full-bridge driving (an upper bridge driving module and a lower bridge driving module) is needed, the number of switching elements can be saved, so that the cost is saved, and the circuit structure is simplified.

Drawings

Fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present disclosure;

fig. 2 is a circuit component diagram of a motor driving circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a half-bridge driving chip according to an embodiment of the disclosure;

fig. 4 is a schematic structural diagram of another motor driving circuit provided in the embodiment of the present disclosure.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present disclosure. Referring to fig. 1, the motor driving circuit includes: the first end of the voltage regulating module 110 is electrically connected with the positive electrode ACL of the alternating current power supply, the second end of the voltage regulating module 110 is electrically connected with the negative electrode ACN of the alternating current power supply, and the third end of the voltage regulating module 110 is electrically connected with the first direct current power supply VP; the voltage regulating module 110 is configured to regulate the voltage of the first dc power VP through the ac voltage of the ac power supply, and output the regulated voltage to the first end of the motor through the second end of the voltage regulating module; the half-bridge driving module 120 is configured to output a voltage of the first dc power source VP or a voltage of the ground terminal GND to the second end of the motor based on the first control signal PWM _ H and the second control signal PWM _ L.

Specifically, the ac power source may be any power source capable of outputting ac power, and the voltage value of the ac power may be set by a person skilled in the art according to practical situations, and is not limited herein.

Specifically, the first dc power source VP may be any power source capable of outputting dc power, and the specific value of the voltage of the first dc power source VP may be set by a person skilled in the art according to practical situations, and is not limited herein.

Specifically, the voltage regulating module 110 may regulate the voltage of the first dc power VP according to the ac voltage of the ac power supply, to obtain a regulated voltage, where the regulated voltage is between 0V and one half of the voltage of the first dc power supply VP, and a specific value of the regulated voltage is associated with a specific structure of the voltage regulating module 110.

For example, when the ac power is +220V to-220V and the voltage of the first dc power source VP is 440V, the voltage after voltage regulation ranges from greater than 0V to 220V or less.

Specifically, the first control input terminal of the half-bridge driving module 120 is configured to receive the first control signal PWM _ H, the second control input terminal of the half-bridge driving module 120 is configured to receive the second control signal PWM _ L, and the half-bridge driving module 120 may output the voltage of the first dc power VP or 0V to the second terminal of the motor based on the first control signal PWM _ H and the second control signal PWM _ L.

Specifically, the first control signal PWM _ H and the second control signal PWM _ L may be Pulse Width Modulation (PWM) signals, but are not limited thereto.

Specifically, the motor driving circuit drives the motor according to the following working principle: when the voltage output by the half-bridge driving module 120 to the second end of the motor is equal to the voltage of the first dc power VP, the first end of the motor receives the voltage after voltage regulation, and the second end of the motor receives the voltage of the first dc power VP, so that the motor can be controlled to accelerate (decelerate); when the half-bridge driving module 120 outputs 0V to the second end of the motor, the first end of the motor receives the voltage after voltage regulation, the second end of the motor receives 0V, and the motor is decelerated (accelerated).

It should be noted that there are many specific embodiments of the voltage regulation module 110 and the half-bridge driving module 120, and a typical example will be described later, which will not be described herein again.

The motor drive circuit of the embodiment of the present disclosure includes: the voltage regulation module 110 is configured to regulate a voltage of the first dc power VP by an ac voltage of an ac power source, and output the regulated voltage to a first end of the motor through a second end of the regulated voltage module 110; the half-bridge driving module 120 is configured to output the voltage of the first dc power VP or 0V to the second end of the motor based on the first control signal PWM _ H and the second control signal PWM _ L. It can be seen that according to the technical solution provided in the embodiment of the present disclosure, the half-bridge driving module 120 is required for the motor driving circuit, and compared with the related art that full-bridge driving (an upper bridge driving module and a lower bridge driving module) is required, the number of switching elements can be reduced, thereby saving cost and simplifying circuit structure.

In another embodiment of the present disclosure, as shown in fig. 2, the voltage regulating module 110 includes: a first rectifying element 111, a second rectifying element 112, a first capacitor C1, and a second capacitor C2; a first end of the first rectifying element 111 is electrically connected to the positive electrode ACL of the ac power supply, and a second end of the first rectifying element 111 is electrically connected to the first dc power supply VP and the first end of the first capacitor C1, respectively; a first end of the second rectifying element 112 is electrically connected to the positive electrode ACL of the ac power supply, and a second end of the second rectifying element 112 is electrically connected to the ground GND and a second end of the second capacitor C2, respectively; the second end of the first capacitor C1 and the first end of the second capacitor C2 are electrically connected to a negative electrode ACN of the ac power supply, and the negative electrode ACN of the ac power supply is electrically connected to the first end of the motor.

Specifically, the first rectifying element 111 and the second rectifying element 112 may be any element having a rectifying function, and are not limited herein.

The first rectifying element 111 is configured to rectify the alternating current to charge the first capacitor C1 with the alternating current; the second rectifying element 112 is used for rectifying the alternating current to charge the second capacitor C2 with the alternating current.

Specifically, the operating principle of the voltage regulating module 110 is as follows: when the alternating current is positive half cycle, the alternating current may charge the first capacitor C1 through the first rectifying element 111 within a first preset time period, and when the alternating current is negative half cycle, the alternating current may charge the second capacitor C2 through the second rectifying element 112 within a second preset time period, so as to regulate the voltage of the first direct current power VP. And the voltage after voltage regulation is associated with the first preset time period and the second preset time period.

In some embodiments, as shown in fig. 2, the first rectifying element 111 includes a first diode D1, and the second rectifying element 112 includes a second diode D2.

Specifically, the positive electrode of the first diode D1 is electrically connected to the positive electrode ACL of the ac power supply, and the negative electrode of the first diode D1 is electrically connected to the first dc power supply VP and the first end of the first capacitor C1, respectively; the cathode of the second diode D2 is electrically connected to the cathode ACN of the ac power supply, and the anode of the second diode D2 is electrically connected to the ground GND and the second end of the second capacitor C2, respectively.

At this time, the operating principle of the voltage regulating module 110 is as follows: when the alternating current is positive half cycle, the alternating current can be through first diode D1, for first electric capacity C1 charges, when the alternating current is negative half cycle, the alternating current can be through second diode D2, for second electric capacity C2 charges to carry out the pressure regulating to first DC power supply VP's voltage. The regulated voltage is equal to one half of the voltage of the first direct current power supply VP.

It can be understood that the cost of the diode is generally low, and therefore, the first diode D1 is used for the first rectifying element 111, and the second diode D2 is used for the second rectifying element 112, so that the cost of the voltage regulating module 110 can be low, and the circuit structure of the voltage regulating driving module 110 can be simple, thereby further simplifying the circuit structure of the motor driving circuit and saving the cost.

In other embodiments, as shown in fig. 2, the first rectifying element 111 comprises a first thyristor and the second rectifying element 112 comprises a second thyristor.

Specifically, a first end of a first silicon controlled rectifier is electrically connected with an anode ACL of an alternating current power supply, a second end of the first silicon controlled rectifier is electrically connected with a first direct current power supply VP and a first end of a first capacitor C1 respectively, and a control end of the first silicon controlled rectifier is used for receiving a first voltage regulating signal; the first end of the second controllable silicon is electrically connected with an anode ACL of the alternating current power supply, the second end of the second controllable silicon is respectively electrically connected with a grounding terminal GND and the second end of the second capacitor C2, and the control end of the first controllable silicon is used for receiving a second voltage regulating signal.

Specifically, the first voltage regulating signal is used for controlling the on/off of the first controllable silicon so as to control the specific duration of the first preset duration; the second voltage regulating signal is used for controlling the on/off of the second controllable silicon so as to control the specific duration of the second preset duration.

At this time, the operating principle of the voltage regulating module 110 is as follows: when the alternating current is positive half cycle, if first silicon controlled rectifier switches on under the control of first pressure regulating signal, then the alternating current can charge for first electric capacity C1 through first silicon controlled rectifier, when the alternating current is negative half cycle, if the second silicon controlled rectifier switches on under the control of second pressure regulating signal, then the alternating current can charge for second electric capacity C2 through the second silicon controlled rectifier to the voltage to first DC power supply VP carries out the pressure regulating. The voltage after voltage regulation is determined by the first voltage regulation signal and the second voltage regulation signal, and can be taken from 0V to one half of the voltage of the first direct current power supply VP.

It can be understood that, since the on-off time of the thyristor can be flexibly adjusted, by setting the first rectifying element 111 to include the first thyristor and setting the second rectifying element 112 to include the second thyristor, the user can adjust the first preset time and the second preset time by adjusting the first voltage regulating signal and the second voltage regulating signal, thereby flexibly setting the specific value of the voltage after voltage regulation, so as to flexibly adjust the voltage of the driving motor.

In still another embodiment of the present disclosure, as shown in fig. 2, the half-bridge driving module 120 includes: a half-bridge driving unit 121, a first switching element 122, and a second switching element 123; a first end of the first switching element 122 is electrically connected to the first direct current power source VP, a second end of the first switching element 122 is electrically connected to a second end of the motor and a first bootstrap terminal VB of the half-bridge driving unit 121, respectively, and a control end of the first switching element 122 is electrically connected to a first control output end of the half-bridge driving unit 121; a first end of the second switching element 123 is electrically connected to a second end of the first switching element 122, a second end of the second switching element 123 is electrically connected to the ground GND, and a control end of the second switching element 123 is electrically connected to a second control output end of the half-bridge driving unit 121; the half-bridge driving unit 121 is configured to output the first control signal PWM _ H through a first control output terminal thereof after performing power amplification on the first control signal PWM _ H, and is further configured to output the second control signal PWM _ L through a second control output terminal thereof after performing power amplification on the second control signal PWM _ L.

Specifically, the half-bridge driving unit 121 may power-amplify the first control signal PWM _ H to generate a first driving current to drive the first switching element 122 to be turned on/off, and may power-amplify the second control signal PWM _ L to generate a second driving current to drive the second switching element 123 to be turned on/off.

Specifically, the operation principle of half-bridge driving module 120 is as follows: the first control signal PWM _ H is power amplified to generate a first driving current to drive the first switch element 122 to be turned on, and the second control signal PWM _ L is power amplified to generate a second driving current to drive the second switch element 123 to be turned off, so as to output the voltage of the first direct current power source VP to the second end of the motor; the first control signal PWM _ H is amplified to generate a first driving current to drive the first switching element 122 to be turned off, and the second control signal PWM _ L is amplified to generate a second driving current to drive the second switching element 123 to be turned on, so as to output 0V to the second end of the motor.

It can be understood that, compared to the related art, in which the upper bridge driving unit controls the two switching elements to be turned on/off based on the two control signals, and the lower bridge driving unit controls the two switching elements to be turned on/off based on the two control signals, in the embodiment of the present disclosure, by providing the half-bridge driving module 120 including the half-bridge driving unit 121, the first switching element 122, and the second switching element 123, the number of driving units and switching elements in the motor driving circuit can be halved, thereby reducing the cost of the motor driving circuit and simplifying the circuit structure of the motor driving circuit.

In some embodiments, as shown in fig. 2, the half-bridge driving unit 121 includes: the half-bridge driving circuit comprises a half-bridge driving chip U1, a third diode D3 and a third capacitor C3; a first end of the third diode D3 is electrically connected to the second dc power source vcc, a second end of the third diode D3 is electrically connected to a first end of the third capacitor C3 and a second bootstrap terminal VS of the half-bridge driving chip U1, respectively, and a second end of the third capacitor C3 is electrically connected to a first bootstrap terminal VB of the half-bridge driving chip U1; the first control output terminal HO of the half-bridge driver chip U1 is electrically connected to the control terminal of the first switching element 122, and the second control output terminal LO of the half-bridge driver chip U1 is electrically connected to the control terminal of the second switching element 123.

Specifically, the specific structure of the half-bridge driving chip U1 may be set by a person skilled in the art according to practical situations, and is not limited herein.

Exemplarily, fig. 3 is a schematic structural diagram of a half-bridge driver chip according to an embodiment of the present disclosure, and as shown in fig. 3, a half-bridge driver chip U1 includes a logic control unit 310, a level shifting unit 320, a first buffer unit 330, a second buffer unit 350, and a delay unit 340.

Specifically, the second dc power vcc may be any power capable of outputting dc power, and the voltage of the second dc power vcc may be set by a person skilled in the art according to actual situations, and is not limited herein. For example, the second dc power source vcc is 15V, but is not limited thereto.

Specifically, the voltage of the first bootstrap terminal VB of the half-bridge driver chip U1 is bootstrap-operated by the third diode D3 (i.e., bootstrap diode) and the third capacitor C3 (i.e., bootstrap capacitor), so that the voltage between the first bootstrap terminal VB and the second bootstrap terminal VS is the second dc power source vcc-the forward voltage drop of the third diode D3.

Specifically, the half-bridge driving unit 121 may further include a fourth capacitor C4, a first terminal of the fourth capacitor C4 is electrically connected to the second current source vcc, and a second terminal of the fourth capacitor C4 is electrically connected to the ground terminal GND. The fourth capacitor C4 functions as a filter.

It can be understood that, by arranging the half-bridge driving unit 121 to include the half-bridge driving chip U1, the integration level of the half-bridge driving unit 121 can be made higher, which is beneficial to further simplifying the circuit structure of the motor driving circuit, and the wiring in the motor driving circuit can be simplified, thereby reducing the cost. Moreover, when the integration level of the motor driving circuit is higher, the volume of the motor driving can be reduced, so that the motor driving circuit is smaller.

Optionally, the half-bridge driving unit 121 further includes a first resistor R1 and a second resistor R2; a first end of the first resistor R1 is configured to receive a first control signal PWM _ H, and a second end of the first resistor R1 is electrically connected to a first control input terminal HIN of the half-bridge driving chip U1; a first end of the second resistor R2 is configured to receive the second control signal PWM _ L, and a second end of the second resistor R2 is electrically connected to the second control input terminal LIN of the half-bridge driver chip U1.

Specifically, the first resistor R1 and the second resistor R2 function as a current limiting function.

It can be understood that, by setting the half-bridge driving unit 121 to include the first resistor R1 and the second resistor R2, the half-bridge driving chip U1 can be prevented from being damaged by the excessive current of the first control signal PWM _ H and the second control signal PWM _ L, so as to prolong the service life of the half-bridge driving chip U1, and further prolong the service life of the motor driving circuit.

In other embodiments, as shown in fig. 2, the first switching element 122 includes a first transistor Q1, and the second switching element 123 includes a second transistor Q2.

Specifically, a first end of the first transistor Q1 is electrically connected to the first direct current power source VP, a second end of the first transistor Q1 is electrically connected to a first end of the second switching tube, a second end of the second switching element 123 is electrically connected to the ground GND, a control end of the first transistor Q1 is electrically connected to a first control output end of the half-bridge driving unit 121, and a control end of the second transistor Q2 is electrically connected to a second control output end of the half-bridge driving unit 121.

Specifically, the first Transistor Q1 and the second Transistor Q2 may be Insulated Gate Bipolar Transistors (IGBTs), metal Oxide Semiconductor (MOS) field effect transistors, triodes, or the like, but are not limited thereto.

It can be understood that, by providing the first switching element 122 including the first transistor Q1 and the second switching element 123 including the second transistor Q2, the first switching element 122 and the second switching element 123 can have simple structures and fast response speeds, and thus the circuit structure of the half-bridge driving module 120 can be simple and fast response speeds can be achieved.

Optionally, the half-bridge driving module 120 further includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; a first end of the third resistor R3 is electrically connected to the first control output end of the half-bridge driving unit 121, a second end of the third resistor R3 is electrically connected to the control end of the first switching element 122 and the first end of the fourth resistor R4, respectively, and a second end of the fourth resistor R4 is electrically connected to the second end of the first switching element 122; a first end of the fifth resistor R5 is electrically connected to the second control output end of the half-bridge driving unit 121, a second end of the fifth resistor R5 is electrically connected to the control end of the second switching element 123 and the first end of the sixth resistor R6, respectively, and a second end of the sixth resistor R6 is electrically connected to the ground GND.

Specifically, the third resistor R3 and the fifth resistor R5 function as a current limiting function.

Specifically, the fourth resistor R4 and the fifth resistor R5 function as a pull-down.

It can be understood that, by providing the half-bridge driving module 120 with the third resistor R3 and the fifth resistor R5, the first transistor Q1 can be prevented from being damaged by the excessive first driving current (the second driving current) output by the half-bridge driving unit 121, and similarly for the fourth resistor R4 and the sixth resistor R6, the life of the first transistor Q1 and the second transistor Q2 can be prolonged, so as to prolong the life of the half-bridge driving module 120.

It can also be understood that when the control terminal of the first transistor Q1 receives a voltage for turning off the first transistor Q1, a parasitic capacitor exists between the second terminal and the control terminal of the first transistor Q1, the first transistor Q1 is not turned off immediately, and the fourth resistor R4 can accelerate the parasitic capacitor to discharge, so as to accelerate the turning off of the first transistor Q1, and avoid heat accumulation on the first transistor Q1, so as to improve the lifetime of the first transistor Q1, and the same is true for the second transistor Q2. Thus, the life of the half-bridge driving module 120 can be increased.

Fig. 4 is a schematic structural diagram of another motor driving circuit according to an embodiment of the present disclosure. Referring to fig. 4, the motor driving circuit may further include a control module 130, a current detection module 140, and a rotation speed and rotor detection module 150, wherein the control module 130 is configured to output a first control signal PWM _ H and a second control signal PWM _ L; the current detection module 140 is used for detecting the current of the motor; the speed and rotor detection module 150 is used to detect the speed and rotor position of the motor.

Specifically, the control module 130 may calculate the frequency and duty ratio of the first control signal PWM _ H and the second control signal PWM _ L by using the actual rotation speed and the target rotation speed of the motor as input quantities through a preset control algorithm, such as a PID control algorithm, and then select whether to output the first control signal PWM _ H or the second control signal PWM _ L according to the rotor position information.

Specifically, referring to fig. 2 and 4, the current detection module 140 may perform current detection through the seventh resistor R7.

Specifically, referring to fig. 2 and 4, the motor drive circuit operates on the following principle: the current detection module 140 detects the current of the motor and sends the detected current to the control module 130; the rotation speed and rotor detection module 150 detects the rotation speed and the rotor position of the motor and sends the detected rotation speed and the detected rotor position to the control module 130; when the current is greater than the threshold, the control module 130 controls the first control signal PWM _ H and the second control signal PWM _ L to be set to 0, the motor stops rotating, and the system alarms, and when the current is less than or equal to the threshold, the control module 130 determines the first control signal PWM _ H and the second control signal PWM _ L based on the received rotating speed (i.e., the actual rotating speed) and the target rotating speed, and determines the first control signal PWM _ H or the second control signal PWM _ L according to the received rotor position to output to the half-bridge driving module 120.

When the first control signal PWM _ H and the second control signal PWM _ L are output to the half-bridge driving module 120, the half-bridge driving unit 120 performs power amplification on the first control signal PWM _ H and the second control signal PWM _ L, and outputs them from the first control output terminal HO and the second control output terminal LO of the half-bridge driving chip U1, respectively. When the first control signal after power amplification is at a high level, the first transistor Q1 is turned on, and meanwhile, the second control signal after power amplification is at a low level, and the second transistor Q2 is turned off, so that the half-bridge driving module 120 outputs the voltage of the first dc power source VP to the second end of the motor, and at this time, the voltage regulating module outputs one half of the voltage of the first dc power source VP to the second end of the motor. When the second control signal after power amplification is at a low level, the first transistor Q1 is turned off, and meanwhile, the second control signal after power amplification is at a high level, and the second transistor Q2 is turned on, so that the half-bridge driving module 120 outputs 0V to the second end of the motor, and at this time, the voltage regulating module outputs one half of the voltage of the first dc power source VP to the second end of the motor.

The embodiment of the disclosure also provides an electric appliance, which comprises the motor driving circuit described in any of the above embodiments. Therefore, the same advantages as the motor driving circuit are obtained, and the description is omitted here. Illustratively, the appliance may include a fan or the like, but is not limited thereto.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A motor drive circuit, comprising:

the first end of the voltage regulating module is electrically connected with the positive electrode of an alternating current power supply, the second end of the voltage regulating module is electrically connected with the negative electrode of the alternating current power supply, and the third end of the voltage regulating module is electrically connected with a first direct current power supply; the voltage regulating module is used for regulating the voltage of the first direct current power supply through the alternating current voltage of the alternating current power supply and outputting the voltage to the first end of the motor through the second end of the voltage regulating module;

half-bridge drive module, half-bridge drive module's first end with first DC power supply electricity is connected, half-bridge drive module's second end is connected with the earthing terminal electricity, half-bridge drive module is used for based on first control signal and second control signal, to the second end output of motor first DC power supply's voltage or the voltage of earthing terminal.

2. The motor drive circuit of claim 1, wherein the voltage regulation module comprises: the first rectifying element, the second rectifying element, the first capacitor and the second capacitor;

a first end of the first rectifying element is electrically connected with a positive electrode of the alternating current power supply, and a second end of the first rectifying element is electrically connected with the first direct current power supply and a first end of the first capacitor respectively;

a first end of the second rectifying element is electrically connected with the positive electrode of the alternating current power supply, and a second end of the second rectifying element is electrically connected with the grounding end and a second end of the second capacitor respectively;

the second end of the first capacitor and the first end of the second capacitor are both electrically connected with the negative pole of the alternating current power supply, and the negative pole of the alternating current power supply is electrically connected with the first end of the motor.

3. The motor drive circuit according to claim 2, wherein the first rectifying element includes a first diode, and the second rectifying element includes a second diode.

4. The motor drive circuit of claim 2, wherein the first rectifying element comprises a first thyristor and the second rectifying element comprises a second thyristor.

5. The motor drive circuit of claim 1 wherein the half-bridge drive module comprises: a half-bridge driving unit, a first switching element, and a second switching element;

a first end of the first switching element is electrically connected to the first direct current power supply, a second end of the first switching element is electrically connected to a second end of the motor and a first bootstrap end of the half-bridge driving unit, respectively, and a control end of the first switching element is electrically connected to a first control output end of the half-bridge driving unit;

a first end of the second switching element is electrically connected to a second end of the first switching element, a second end of the second switching element is electrically connected to the ground terminal, and a control end of the second switching element is electrically connected to a second control output end of the half-bridge driving unit;

the half-bridge driving unit is used for outputting the first control signal through a first control output end after power amplification is carried out on the first control signal, and is also used for outputting the second control signal through a second control output end after power amplification is carried out on the second control signal.

6. Motor drive circuit according to claim 5, characterized in that the half-bridge drive unit comprises: the half-bridge driving chip, the third diode and the third capacitor;

a first end of the third diode is electrically connected with a second direct current power supply, a second end of the third diode is electrically connected with a first end of the third capacitor and a second bootstrap end of the half-bridge driving chip respectively, and a second end of the third capacitor is electrically connected with the first bootstrap end of the half-bridge driving chip;

the first control output end of the half-bridge driving chip is electrically connected with the control end of the first switch element, and the second control output end of the half-bridge driving chip is electrically connected with the control end of the second switch element.

7. The motor drive circuit of claim 6 wherein the half-bridge drive unit further comprises a first resistor and a second resistor;

the first end of the first resistor is used for receiving the first control signal, and the second end of the first resistor is electrically connected with the first control input end of the half-bridge driving chip;

the first end of the second resistor is used for receiving the second control signal, and the second end of the second resistor is electrically connected with the second control input end of the half-bridge driving chip.

8. The motor drive circuit according to claim 5, wherein the first switching element includes a first transistor, and the second switching element includes a second transistor.

9. The motor drive circuit of claim 8 wherein the half-bridge drive module further comprises: a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;

a first end of the third resistor is electrically connected to the first control output end of the half-bridge driving unit, a second end of the third resistor is electrically connected to the control end of the first switching element and the first end of the fourth resistor, respectively, and a second end of the fourth resistor is electrically connected to the second end of the first switching element;

the first end of the fifth resistor is electrically connected to the second control output end of the half-bridge driving unit, the second end of the fifth resistor is electrically connected to the control end of the second switching element and the first end of the sixth resistor, respectively, and the second end of the sixth resistor is electrically connected to the ground end.

10. An electrical appliance, comprising: a motor drive circuit as claimed in any one of claims 1 to 9.

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