CN217545915U - Motor drive circuit and air conditioner - Google Patents

Abstract

The application discloses a motor driving circuit and an air conditioner, wherein the motor driving circuit comprises a first control module, a first switch unit and a charging and discharging unit, the first control module is connected with a target motor through the first switch unit, and the charging and discharging unit is respectively connected with the first control module and the first switch unit; the first control module is used for charging the charging and discharging unit when the charging and discharging unit is switched on and powering off the target motor when the charging and discharging unit is switched off; the charging and discharging unit is used for driving the first switch unit to be conducted when the charging voltage reaches a preset voltage threshold; the first switch unit is used for being matched with the conducted first control module when being conducted, so that the target motor is electrified. The first switch unit of this application does not have the condition of contact adhesion when switching on and breaking off, consequently can ensure with electric safety, has improved motor drive circuit's reliability and security.

Description

Motor drive circuit and air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to a motor driving circuit and an air conditioner.

Background

At present, an inner machine control panel of a high-power alternating current motor of an outer machine of an air conditioner controls the operation of the high-power alternating current motor through a relay, specifically, an alternating current contactor of the outer machine is controlled through the relay, and then the high-power alternating current motor is controlled by the alternating current contactor.

The alternating current contactor realizes the connection and disconnection of a contact by utilizing the cooperation of electromagnetic force and spring elasticity, and has two working states: when the attraction coil is electrified, the static iron core generates electromagnetic attraction force, the armature is attracted, and the connecting rod connected with the armature drives the contact to act, so that the normally closed contact contactor is in an electrified state; when the attraction coil is powered off, the electromagnetic attraction force disappears, the armature iron reopens, the normally open contact is closed, the normally open contact is released under the action of the reset spring, all the contacts reset accordingly, and the contactor is in a power-off state.

However, the ac contactor controls the high-power ac motor by the action of the mechanical contact, so that an electric arc is easily generated in the process of opening and closing the moving contact and the static contact, and the contact is easily adhered under the action of the electric arc, thereby causing an electrical accident.

SUMMERY OF THE UTILITY MODEL

The application provides a motor drive circuit and an air conditioner, and aims to solve the problem that electrical accidents are caused by contact adhesion in the prior art that a high-power alternating current motor is controlled through an alternating current contactor.

In a first aspect, the present application provides a motor driving circuit, which includes a first control module, a first switch unit, and a charge and discharge unit, wherein the first control module is connected to a target motor through the first switch unit, and the charge and discharge unit is respectively connected to the first control module and the first switch unit;

the first control module is used for charging the charging and discharging unit when the charging and discharging unit is switched on and powering off the target motor when the charging and discharging unit is switched off;

the charging and discharging unit is used for driving the first switch unit to be conducted when the charging voltage reaches a preset voltage threshold;

and the first switch unit is used for being matched with the conducted first control module when being conducted to electrify the target motor.

In a possible implementation manner of the present application, the first switch unit includes a thyristor, a first end of the thyristor is connected to the first control module, a second end of the thyristor is connected to the target motor, and a control end of the thyristor is connected to the charge and discharge unit.

In a possible implementation manner of the application, the charging and discharging unit comprises an adjusting resistor and a driving capacitor, a first end of the adjusting resistor is connected with the first control module, a second end of the adjusting resistor is connected with a first end of the driving capacitor and a control end of the thyristor respectively, and a second end of the driving capacitor is connected with a second end of the thyristor.

In one possible implementation manner of the present application, the motor driving circuit further includes a main control unit connected to the first control module;

the main control unit is used for outputting a first control signal to the first control module;

a first control module configured to switch an operating state in response to a first control signal.

In this application a possible implementation, first control module includes first triode and first relay, and the base and the main control unit of first triode are connected, and the first power end is connected through the coil connection first power end of first relay to the collecting electrode of first triode, and the motor power supply end is connected to the one end of the contact group of first relay, and first switch unit is connected to the other end.

In one possible implementation manner of the present application, the motor driving circuit further includes a second control module, and the second control module is respectively connected to the main control unit and the target motor;

the main control unit is used for outputting a second control signal to the second control module;

and the second control module is configured to respond to the second control signal to switch the working state so as to enable the target motor to be electrified when the second control module is conducted and to enable the target motor to be powered off when the second control module is disconnected.

In a possible implementation manner of the present application, the second control module includes a second triode and a second relay, a base of the second triode is connected with the main control unit, a collector of the second triode is connected with a second power end through a coil of the second relay, one end of a contact group of the second relay is connected with a power supply end of the motor, and the other end of the contact group of the second relay is connected with the target motor.

In a possible implementation manner of the present application, the motor driving circuit further includes a bleeding protection unit connected to the target motor, and the bleeding protection unit is configured to bleed a self-induced electromotive force when the target motor is powered off.

In one possible implementation manner of the present application, the leakage protection unit includes a leakage capacitor and a leakage resistor connected in series.

In a second aspect, the present application also provides an air conditioner including the motor drive circuit of the first aspect.

From the above, the present application has the following advantageous effects:

in this application, charge for the charge and discharge unit when switching on through first control module, when the charging voltage of charge and discharge unit reaches predetermineeing the voltage threshold, switch on through the first switch unit of charge and discharge unit drive, thereby the first switch unit that switches on and the cooperation of first control module make the circular telegram work of target motor, compared in prior art and there is the contact adhesion to arouse electric accident through the high-power alternating current motor of alternating current contactor control, the first switch unit of this application does not have the condition of contact adhesion when switching on and breaking off, consequently, can ensure the power consumption safety, motor drive circuit's reliability and security have been improved.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings required for the description of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without creative efforts.

FIG. 1 is a functional block diagram of a motor drive circuit provided in an embodiment of the present application;

FIG. 2 is a schematic circuit diagram of a motor drive circuit provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of another functional block of a motor drive circuit provided in an embodiment of the present application;

FIG. 4 is another schematic circuit diagram of a motor drive circuit provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of an air conditioner provided in the embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described clearly and completely with reference to the drawings in the present application, and it should be apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Before introducing the motor driving circuit and the air conditioner of the present application, a motor driving method in the related art will be briefly described.

The high-power alternating current motor of the existing air conditioner outdoor unit is controlled by an alternating current contactor, and particularly, an indoor unit control panel controls the alternating current contactor through a relay, so that the high-power alternating current motor is controlled through the alternating current contactor.

However, the ac contactor has a large volume and a high cost, and a special plastic case is required to fix the ac contactor, and the ac contactor uses electromagnetic force and spring force to match with each other to connect and disconnect the contacts, so that the contacts of the ac contactor are easily adhered due to the action of an electric arc when being disconnected and connected, thereby causing a fault and an electrical accident.

In view of the above problems, the present application provides a motor driving circuit and an air conditioner to overcome the above problems, and the motor driving circuit and the air conditioner provided by the present application are described in detail below.

First, referring to fig. 1, fig. 1 is a schematic diagram of a functional module of a motor driving circuit provided in an embodiment of the present application. The motor driving circuit 10 may include a first control module 100, a first switching unit 200, and a charging and discharging unit 300, wherein the first control module 100 is connected to a target motor 400 through the first switching unit 200, and the charging and discharging unit 300 is connected to the first control module 100 and the first switching unit 200, respectively.

The first control module 100 may be used to charge the charge and discharge unit 300 when turned on and to de-energize the target motor 400 when turned off; the charging and discharging unit 300 may be configured to drive the first switch unit 200 to be turned on when the charging voltage reaches a preset voltage threshold; the first switching unit 200 may be used to cooperate with the turned-on first control module 100 when turned on, to energize the target motor 400.

It is understood that the target motor 400 may be a high-power ac motor of an air conditioner external unit, the target motor 400 may be connected to a zero line led out from a motor power supply end, where the motor power supply end may be a mains output end or a power transmission line interface or the like, which may provide an operating voltage for the target motor 400.

In the embodiment of the present application, the first control module 100 and the first switch unit 200 may be connected in series between the live line and the neutral line of the power supply end of the motor, so that when both the first control module 100 and the first switch unit 200 are turned on, the power supply loop is turned on, and the target motor 400 may be powered on; on the contrary, if either or both of the first control module 100 and the first switching unit 200 is disconnected, the power supply circuit is disconnected, and the target motor 400 is shut down and stops operating.

Unlike the prior art in which the target motor 400 is controlled to be turned on or off by an ac contactor, in the embodiment of the present application, the first control module 100 controls the operating state of the first switching unit 200, so that the first switching unit 200 controls the state of the target motor 400.

Meanwhile, the first switch unit 200 is also controlled by the charge and discharge unit 300, that is, when the first control module 100 is turned on, the first switch unit 200 cannot be turned on immediately, the turned on first control module 100 charges the charge and discharge unit 300, and when the charging voltage of the charge and discharge unit 300 reaches a preset voltage threshold, the charge and discharge unit 300 can drive the first switch unit 200 to be turned on, and at this time, the turned on first switch unit 200 and the first control module 100 form a power supply loop together, so that the target motor 400 can be operated by power.

When the first control module 100 is turned off, the power supply circuit is turned off regardless of the state of the first switching unit 200, and thus the target motor 400 connected to the neutral line is turned off and stops operating, and thus the target motor 400 is also turned off and stops operating when the first control module 100 is turned off.

It should be noted that the preset voltage threshold in the embodiment of the present application may be determined according to a device type of the first switch unit 200, and the preset voltage threshold may be different in different specific application scenarios, which is not limited herein.

In the embodiment of the present application, the charging and discharging unit 300 is charged when the first control module 100 is turned on, when the charging voltage of the charging and discharging unit 300 reaches the preset voltage threshold, the charging and discharging unit 300 drives the first switch unit 200 to be turned on, so that the first switch unit 200 and the first control module 100 that are turned on cooperate to enable the target motor 400 to be powered on to work, compared to the electrical accident caused by the contact adhesion in the case of controlling a high-power ac motor through an ac contactor in the prior art, the first switch unit 200 of the present application does not have the condition of contact adhesion when being turned on and off, thereby ensuring the electrical safety, and improving the reliability and safety of a motor driving circuit.

Referring to fig. 3, fig. 3 is a schematic diagram of another functional block of the motor driving circuit provided in the embodiment of the present application, and in some embodiments of the present application, the motor driving circuit 10 may further include a main control unit 500 connected to the first control module 100; the main control unit 500 may be configured to output a first control signal to the first control module 100; the first control module 100 may be configured to transition the operating state in response to a first control signal.

It can be understood that the main control Unit 500 may be an integrated chip configured with multiple Input/Output (I/O) interfaces, such as a Micro Controller Unit (MCU) or a single chip, and an Output interface of the main control Unit 500 may be connected to the first control module 100, so as to transmit the first control signal to the first control module 100 through the Output interface, so that the first control module 100 switches the operating state in response to the first control signal.

It can be understood that the operating state of the first control module can be an on state or an off state, and therefore, the main control unit 500 can indirectly control the on or off of the target motor 400 by controlling the first control module 100 through the first control signal.

Referring to fig. 2, fig. 2 is a schematic circuit diagram of a motor driving circuit provided in an embodiment of the present application, in some embodiments of the present application, the first control module 100 may include a first transistor Q1 and a first RELAY K1, wherein a base of the first transistor Q1 is connected to a RELAY CON2 interface of the main control unit 500, a collector of the first transistor Q1 is connected to a first power terminal +12V through a coil of the first RELAY K1, one end of a contact set of the first RELAY K1 is connected to a live line L of a motor power supply terminal, and the other end is connected to the first switching unit 200. The collector of the first triode Q1 may be further connected to the anode of a first diode D1, the cathode of the first diode D1 is connected to the first power terminal +12V via a third resistor R3, and the emitter of the first triode Q1 is grounded.

The first switch unit 200 may include a thyristor ZD1, a first end of the thyristor ZD1, that is, a pin 1, is connected to the contact group of the first relay K1, a second end of the thyristor ZD1, that is, a pin 2, is connected to the target motor M, and a control end of the thyristor ZD1, that is, a pin 3, is connected to the charge and discharge unit 300.

The charging and discharging unit 300 may include an adjusting resistor R5 and a driving capacitor C1, a first end of the adjusting resistor R5 is connected to the first end of the thyristor ZD1, i.e. pin 1, a second end of the adjusting resistor R5 is connected to the first end of the driving capacitor C1 and the control end of the thyristor ZD1, i.e. pin 3, respectively, and a second end of the driving capacitor C1 is connected to the second end of the thyristor ZD1, i.e. pin 2.

The working principle of the motor driving circuit is as follows:

when the main control unit 500 outputs a high level signal through the RELAY CON2 interface, the base of the first triode Q1 receives the high level signal, the first triode Q1 is turned on, one end of the coil of the first RELAY K1 is connected to the first power supply terminal +12V through the third resistor R3, and the other end is grounded through the turned-on first triode Q1, therefore, the coil of the first RELAY K1 is electrified, so as to attract the contact group coupled with the coil to be closed, at the instant that the contact group of the first RELAY K1 is closed, the voltage at both ends of the driving capacitor C1 cannot be suddenly changed due to the characteristic of the capacitor, so that at this time, the control terminal of the thyristor ZD1, i.e. 3 pins, is not electrified, the thyristor ZD1 is still turned off, and at the same time, the current charges the driving capacitor C1 through the adjusting resistor R5, when the charging voltage of the driving capacitor C1 reaches the preset voltage threshold, the preset voltage threshold here can be the trigger voltage of the thyristor ZD1, the thyristor ZD1 is turned on, the power supply loop formed by the closed first RELAY K1 and the turned on thyristor ZD1 at this time, and the target motor M is turned on and operated.

When the target motor M needs to be shut down, the main control unit 500 outputs a low level signal through the RELAY CON2 interface, and after the base of the first triode Q1 receives the low level signal, the first triode Q1 is turned off, so that the coil of the first RELAY K1 loses power, the contact group coupled with the coil is turned off, the power supply loop is broken, and the target motor M loses power and stops running.

In the embodiment of the application, the charging time of the driving capacitor C1 can be adjusted by adjusting the parameters of the adjusting resistor R5 and the driving capacitor C1, so that the charging voltage of the driving capacitor C1 in the preset charging time can reach the preset voltage threshold, and it can be understood that the charging time can be 2s, 5s and the like, and can be specifically determined according to the actual application scenario.

In the embodiment of the application, the state of the target motor M is controlled by the thyristor ZD1, compared with an alternating current contactor, the circuit is miniaturized in size and lower in cost, an electrical accident caused by contact adhesion can be avoided, and the safety and the reliability of a motor driving circuit are improved.

However, if the thyristor ZD1 is turned on for a long time, it may be damaged due to an excessively high temperature rise, and in order to avoid this problem, please continue to refer to fig. 3, in some embodiments of the present application, the motor driving circuit 10 may further include a second control module 600, and the second control module 600 may be connected to the main control unit 500 and the target motor 400 respectively; the main control unit 500 may be configured to output a second control signal to the second control module 600; the second control module 600 may be configured to switch an operating state in response to the second control signal to energize the target motor 400 when the second control module 600 is on and to de-energize the target motor 400 when the second control module 600 is off.

It is understood that the second control module 600 may switch an operation state in response to the second control signal output from the main control unit 500, and the operation state of the second control module 600 may be both on and off states.

In this embodiment, after the first control module 100 and the first switch unit 200 are turned on to switch on the target motor 400, the main control unit 500 may output a second control signal to the second control module 600 to switch on the second control module 600, and then the main control unit 500 outputs a first control signal to the first control module 100 to switch off the first control module 100, at this time, the target motor 400 may continue to be powered on and operate through the second control module 600.

When the target motor 400 needs to be turned off, the main control unit 500 outputs a first control signal to the first control module 100 to turn on the first control module 100 when the second control module 600 is kept on, so that the first switch unit 200 is also turned on when the charging voltage of the charging and discharging unit 300 reaches a preset voltage threshold, at this time, the main control unit 500 outputs a second control signal to the second control module 600 to turn off the second control module 600, at this time, the first control module 100 and the first switch unit 200 are still in a conducting state, so that the target motor 400 is not turned off, and finally, the main control unit 500 outputs a first control signal to turn off the first control module 100 and turn off the first switch unit 200, so that the target motor 400 is turned off and turned off.

In the embodiment of the present application, the main control unit 500 controls the first control module 100 and the second control module 600 to be alternately turned on or off, specifically, the first switch unit 200 performs final control no matter the target motor 400 is turned on or turned off, so as to avoid electrical accidents caused by adhesion of mechanical contacts, and ensure electrical safety.

Referring to fig. 4, fig. 4 is another schematic circuit diagram of a motor driving circuit provided in the present embodiment, in some embodiments of the present invention, the second control module 600 may include a second transistor Q2 and a second RELAY K2, a base of the second transistor Q2 is connected to the RELAY CON1 interface of the main control unit 500, a collector of the second transistor Q2 is connected to the second power terminal +12V through a coil of the second RELAY K2, one end of a contact set of the second RELAY K2 is connected to the live line L of the motor power supply terminal, and the other end is connected to the target motor M. The collector of the second transistor Q2 may be further connected to an anode of a second diode D2, a cathode of the second diode D2 is connected to the second power terminal +12V via a first resistor R1, and an emitter of the second transistor Q2 is grounded.

When the main control unit 500 outputs a high level signal through the RELAY CON1 interface, the base of the second triode Q2 receives the high level signal, the second triode Q2 is turned on, one end of the coil of the second RELAY K2 is connected to the second power supply terminal +12V through the first resistor R1, and the other end is grounded through the turned-on second triode Q2, so that the coil of the second RELAY K2 is electrified, the contact group coupled with the coil is attracted to be closed, the power supply loop formed by the second RELAY K2 is turned on, and the target motor M is electrified and operated.

When the target motor M needs to be shut down, the main control unit 500 outputs a low level signal through the RELAY CON1 interface, and after the base of the second triode Q2 receives the low level signal, the second triode Q2 is turned off, so that the coil of the second RELAY K2 loses power, the contact group coupled with the coil is turned off, the power supply loop is broken, and the target motor M loses power and stops running.

In the embodiment of the application, in order to avoid the adhesion of mechanical contacts and the overhigh temperature rise of the silicon controlled rectifier ZD1 during long-time work, the states of the first triode Q1 and the second triode Q2 can be controlled through the main control unit 500, and then the target motor M is controlled to be powered on or powered off through the silicon controlled rectifier ZD1, so that the power utilization safety is ensured.

The working principle of the motor driving circuit is as follows:

when the target motor M needs to be started, the main control unit 500 outputs a high level signal through the RELAY CON2 interface, the base of the first triode Q1 receives the high level signal, the first triode Q1 is turned on, one end of the coil of the first RELAY K1 is connected with the first power end +12V through the third resistor R3, and the other end is grounded through the turned-on first triode Q1, therefore, the coil of the first RELAY K1 is electrified, so as to attract the contact group coupled with the coil to be closed, at the moment when the contact group of the first RELAY K1 is closed, the voltage at the two ends of the driving capacitor C1 cannot be suddenly changed due to the characteristic of the capacitor, at this moment, the control end of the thyristor ZD1, namely 3 pins, is not electrified, the thyristor ZD1 is still disconnected, meanwhile, the current charges the driving capacitor C1 through the adjusting resistor R5, when the charging voltage of the driving capacitor C1 reaches a preset voltage threshold, the preset voltage threshold can be the trigger voltage of the thyristor ZD1, the thyristor ZD1 is turned on, the closed first RELAY K1 and the power supply loop formed by the turned on thyristor ZD1, and the target motor M is turned on.

Because the silicon controlled rectifier ZD1 may be damaged due to too high temperature rise when working for a long time, when the silicon controlled rectifier ZD1 is turned on, the main control unit 500 may output a high level signal through the RELAY CON1 interface, the base of the second triode Q2 receives the high level signal, the second triode Q2 is turned on, one end of the coil of the second RELAY K2 is connected to the second power supply terminal +12V through the first resistor R1, and the other end is grounded through the turned-on second triode Q2, therefore, the coil of the second RELAY K2 is powered on, so as to attract the contact group coupled with the coil to be closed, the power supply loop formed by the second RELAY K2 is turned on, and at this time, the power supply loop of the second RELAY K2 may be used for supplying power to the target motor M.

Therefore, after the power supply circuit formed by the second RELAY K2 is turned on, the main control unit 500 may output a low level signal through the RELAY CON2 interface, and after the base of the first triode Q1 receives the low level signal, the first triode Q1 is turned off, and then the coil of the first RELAY K1 loses power, and the contact group coupled with the coil is turned off, so that the power supply circuit of the first RELAY K1 and the thyristor ZD1 is turned off, and the power supply circuit of the second RELAY K2 supplies power to the target motor M.

When the target motor M needs to be shut down, the main control unit 500 can output a high level signal through the RELAY CON2 interface again, so that the first triode Q1 is switched on, and then the coil of the first RELAY K1 is electrified, thereby attracting the contact group coupled with the coil to be closed, the current is still charged for the driving capacitor C1 through the adjusting resistor R5 after the contact group is closed, when the charging voltage of the driving capacitor C1 reaches the preset voltage threshold, the thyristor ZD1 is switched on, at this moment, the power supply loop formed by the first RELAY K1 and the thyristor ZD1 is switched on, and the target motor M can be powered through the power supply loop.

Then the main control unit 500 may output a low level signal through the RELAY CON1 interface, and after the base of the second triode Q2 receives the low level signal, the second triode Q2 is turned off, and then the coil of the second RELAY K2 loses power, and the contact group coupled with the coil is turned off, so that the power supply circuit of the second RELAY K2 is turned off, and the power supply circuit formed by the first RELAY K1 and the thyristor ZD1 supplies power to the target motor M.

Finally, the main control unit 500 outputs a low level signal through the RELAY CON2 interface, and after the base of the first triode Q1 receives the low level signal, the first triode Q1 is disconnected, and then the coil of the first RELAY K1 loses power, and the contact group coupled with the coil is disconnected, so that the power supply circuit of the first RELAY K1 and the silicon controlled rectifier ZD1 is disconnected, and the target motor M is powered off and shut down.

In the embodiment of the application, no matter starting or shutting down the target motor M, the state of the silicon controlled rectifier ZD1 is controlled, but not the relay or the alternating current contactor, so that the electric accident caused by the adhesion of mechanical contacts can be avoided, meanwhile, the conduction of the target motor M is maintained by the second relay K2, the problem that the temperature rise of the silicon controlled rectifier ZD1 is high due to long-time work can be avoided, the electricity utilization safety is ensured, and the reliability and the safety of a motor driving circuit are improved.

With continued reference to fig. 3 and 4, in some embodiments of the present application, the motor driving circuit 10 may further include a bleeding protection unit 700 connected to the target motor 400, where the bleeding protection unit 700 may be used to bleed off the self-induced electromotive force when the target motor 400 is powered off.

The leakage protection unit 700 may include a leakage capacitor C2 and a leakage resistor R6 connected in series, specifically, since the target motor 400 may generate self-induced electromotive force at the moment of power failure, when the target motor 400 is powered off, the leakage capacitor C2 connected to the target motor M may store the energy of the self-induced electromotive force of the target motor 400, and then the leakage resistor R6 connected in series with the leakage capacitor C2 consumes the energy stored in the leakage capacitor C2, thereby avoiding burning the circuit board due to the excessive self-induced electromotive force, and ensuring the circuit safety.

On the basis of the foregoing embodiments, the present application further provides an air conditioner, please refer to fig. 5, fig. 5 is a schematic structural diagram of the air conditioner provided in the embodiments of the present application, the air conditioner 50 may include the motor driving circuit 10 in any of the foregoing embodiments, and the motor driving circuit 10 controls the start and stop of the target motor 400, so as to avoid an electrical accident caused by adhesion of mechanical contacts, and ensure electrical safety.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.

In specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as the same entity or several entities, and specific implementation of each unit or structure may refer to the foregoing embodiment, which is not described herein again.

The motor driving circuit and the air conditioner provided by the present application are introduced in detail above, and specific examples are applied in the present application to explain the principle and the implementation of the present application, and the above description is only used to help understand the circuit and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A motor driving circuit is characterized by comprising a first control module, a first switch unit and a charging and discharging unit, wherein the first control module is connected with a target motor through the first switch unit, and the charging and discharging unit is respectively connected with the first control module and the first switch unit;

the first control module is used for charging the charge and discharge unit when the charging and discharge unit is switched on and switching off the target motor;

the charging and discharging unit is used for driving the first switch unit to be conducted when the charging voltage reaches a preset voltage threshold;

and the first switch unit is used for being matched with the conducted first control module when being conducted to electrify the target motor.

2. The motor driving circuit according to claim 1, wherein the first switching unit includes a thyristor, a first end of the thyristor is connected to the first control module, a second end of the thyristor is connected to the target motor, and a control end of the thyristor is connected to the charging and discharging unit.

3. The motor driving circuit according to claim 2, wherein the charging and discharging unit includes an adjusting resistor and a driving capacitor, a first end of the adjusting resistor is connected to the first control module, a second end of the adjusting resistor is connected to the first end of the driving capacitor and the control end of the thyristor, and a second end of the driving capacitor is connected to the second end of the thyristor.

4. The motor drive circuit according to any one of claims 1 to 3, further comprising a main control unit connected to the first control module;

the main control unit is used for outputting a first control signal to the first control module;

the first control module is configured to switch an operating state in response to the first control signal.

5. The motor driving circuit according to claim 4, wherein the first control module comprises a first triode and a first relay, a base of the first triode is connected with the main control unit, a collector of the first triode is connected with a first power supply end through a coil of the first relay, one end of a contact set of the first relay is connected with a motor power supply end, and the other end of the contact set of the first relay is connected with the first switching unit.

6. The motor driving circuit according to claim 4, further comprising a second control module, the second control module being connected to the main control unit and the target motor, respectively;

the main control unit is used for outputting a second control signal to the second control module;

the second control module is configured to switch an operating state in response to the second control signal to energize the target motor when the second control module is on and to de-energize the target motor when the second control module is off.

7. The motor driving circuit according to claim 6, wherein the second control module comprises a second triode and a second relay, a base of the second triode is connected with the main control unit, a collector of the second triode is connected with a second power supply end through a coil of the second relay, one end of a contact set of the second relay is connected with a motor power supply end, and the other end of the contact set of the second relay is connected with the target motor.

8. The motor drive circuit of claim 1 further comprising a bleed-off protection unit coupled to the target motor, the bleed-off protection unit configured to bleed off a self-induced electromotive force when the target motor is de-energized.

9. The motor drive circuit of claim 8, wherein the bleed protection unit comprises a bleed capacitor and a bleed resistor in series.

10. An air conditioner characterized by comprising the motor drive circuit according to any one of claims 1 to 9.

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