Motor driving circuit and air conditioner

Abstract

The utility model provides a motor driving circuit and an air conditioner. The motor driving circuit is respectively connected with a target motor and a target load. The motor driving circuit comprises a driving module, a first switch module and a kinetic energy recovery module. The driving module is connected with the power supply end of the target motor through the first switch module, the input end of the kinetic energy recovery module is connected with the power supply end of the target motor through the first switch module, and the output end of the kinetic energy recovery module is connected with the target load. A first switch module is arranged to control a specific module connected with a target motor, and a driving module drives the target motor; and when the target motor generates counter electromotive force, the counter electromotive force charges the kinetic energy recovery module, so that the kinetic energy recovery module can store the electric energy of the counter electromotive force of the target motor, power is supplied to the target load based on the stored electric energy, and the power consumption of the air conditioner is reduced.

Description

Technical Field

[0001] The utility model relates to the field of motor control, and particularly to a motor drive circuit and an air conditioner. Background Art

[0002] In the existing air conditioner control technology, the air conditioner is powered by the mains for internal electrical appliances. With the increasing demand for energy conservation and environmental protection, how to reduce the energy consumption of the air conditioner has become a concerned issue. Content of the Utility Model

[0003] The main purpose of the utility model is to propose a motor drive circuit and an air conditioner, aiming to solve the problem of how to reduce the energy consumption of the air conditioner in the prior art.

[0004] To achieve the above purpose, the utility model provides a motor drive circuit, which is respectively connected to a target motor and a target load; the motor drive circuit includes a drive module, a first switch module and a kinetic energy recovery module; the drive module is connected to the power supply terminal of the target motor through the first switch module, the input terminal of the kinetic energy recovery module is connected to the power supply terminal of the target motor through the first switch module, and the output terminal of the kinetic energy recovery module is connected to the target load; wherein:

[0005] The first switch module is used to respectively control the connection between the drive module, the kinetic energy recovery module and the power supply terminal of the target motor, wherein the drive module and the kinetic energy recovery module are not simultaneously connected to the target motor through the first switch module;

[0006] The drive module is used to output an electrical signal to the target motor to drive the target motor to act;

[0007] The kinetic energy recovery module is used to be charged through the electrical signal output by the target motor and supply power to the target load.

[0008] Optionally, the first switch module includes a first switch unit and a second switch unit; wherein:

[0009] The first switch unit is connected between the drive module and the target motor, and the second switch unit is connected between the kinetic energy recovery module and the target motor.

[0010] Optionally, the target motor includes a three-phase power supply terminal; the kinetic energy recovery module includes a recovery unit; wherein:

[0011] The recovery unit is connected to any two-phase power supply terminals of the target motor through the second switch unit.

[0012] Optionally, the target motor includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module includes a recovery unit; wherein:

[0013] The recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor through the first recovery switch;

[0014] The recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor through the second recovery switch;

[0015] The recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor through the third recovery switch.

[0016] Optionally, the target motor includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module includes three recovery units, namely a first recovery unit, a second recovery unit, and a third recovery unit; wherein:

[0017] The first recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor through the first recovery switch;

[0018] The second recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor through the second recovery switch;

[0019] The third recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor through the third recovery switch.

[0020] Optionally, the recovery unit includes a switching tube, an inductor, a diode, and a capacitor; wherein:

[0021] The input end of the switching tube is connected to a phase power supply terminal of the target motor, the output end of the switching tube is connected to another phase power supply terminal of the target motor through the inductor, the output end of the switching tube is further connected to the negative electrode of the diode, the positive electrode of the diode is connected to another phase power supply terminal of the target motor through the capacitor, and the capacitor is connected in parallel with the target load.

[0022] Optionally, the first switch module further includes a current detection unit, a main control unit, and a third switch unit. The detection ends of the current detection unit are respectively connected to the three-phase power supply terminals of the target motor, the output end of the current detection unit is connected to the input end of the main control unit, the output end of the main control unit is connected to the control end of the third switch unit, and the third switch unit is respectively connected to the three-phase power supply terminals of the target motor; wherein:

[0023] The current detection unit is configured to detect the current of each phase of the three-phase power supply terminals of the target motor, and send the detection result to the main control unit;

[0024] The main control unit is configured to determine the target two-phase power supply terminals of the target motor corresponding to the phase current with the minimum current according to the detection result, and send a closing signal to the third switch unit to enable the third switch unit to connect the target two-phase power supply terminals.

[0025] To achieve the above object, the present invention provides an air conditioner, characterized in that the air conditioner includes a target motor, a target load, and the motor drive circuit as described above.

[0026] Optionally, the air conditioner further includes a main control module and a signal receiving module; a first input end of the main control module is connected to the signal receiving module, and a first output end of the main control module is connected to a control end of a first switch module in the motor drive circuit; wherein:

[0027] The main control module is configured to determine the operating state of the target motor according to the signal received by the signal receiving module;

[0028] And send a first control signal to the first switch module according to the operating state;

[0029] The first switch module is configured to connect the drive module or the kinetic energy recovery module to the power supply terminal of the target motor according to the first control signal.

[0030] Optionally, the air conditioner further includes a current detection module, a second switch module, and an air conditioner power supply. A detection end of the current detection module is connected to an output end of the kinetic energy recovery module, an output end of the current detection module is connected to a second input end of the main control module, a second output end of the main control module is connected to a control end of the second switch module, and the second switch module is respectively connected to the kinetic energy recovery module, the target load, and the air conditioner power supply;

[0031] The main control module is configured to judge the power state of the kinetic energy recovery module according to the output current of the kinetic energy recovery module detected by the current detection module, and send a second control signal to the second switch module according to the power state;

[0032] The second switch module is configured to connect the kinetic energy recovery module or the air conditioner power supply to the target load according to the second control signal.

[0033] A motor drive circuit and an air conditioner proposed by the present utility model, the motor drive circuit is respectively connected to a target motor and a target load; the motor drive circuit includes a drive module, a first switch module and a kinetic energy recovery module; the drive module is connected to the power supply terminal of the target motor through the first switch module, the input end of the kinetic energy recovery module is connected to the power supply terminal of the target motor through the first switch module, and the output end of the kinetic energy recovery module is connected to the target load; wherein: the first switch module is used to respectively control the connection between the drive module, the kinetic energy recovery module and the power supply terminal of the target motor, wherein the drive module and the kinetic energy recovery module are not connected to the target motor through the first switch module at the same time; the drive module is used to output an electrical signal to the target motor to drive the target motor to act; the kinetic energy recovery module is used to charge through the electrical signal output by the target motor and supply power to the target load. By setting the first switch module to control the specific module connected to the target motor, the drive module drives the target motor; when the target motor generates a back electromotive force, the back electromotive force will charge the kinetic energy recovery module, so that the kinetic energy recovery module can store the electrical energy of the back electromotive force of the target motor, and then supply power to the target load based on the stored electrical energy, realizing the reduction of the power consumption of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present utility model, and are used together with the specification to explain the principles of the present utility model.

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0037] Figure 1 It is a module structure diagram of the motor drive circuit of the present utility model;

[0038] Figure 2 It is a schematic structural diagram of the first switch module in the motor drive circuit of the present utility model;

[0039] Figure 3 It is a circuit structure diagram of the kinetic energy recovery module in the motor drive circuit of the present utility model;

[0040] Figure 4 Schematic diagram of the third switch unit in the motor drive circuit of the present utility model;

[0041] Figure 5 Module structure diagram of the air conditioner of the present utility model;

[0042] Figure 6 Schematic flow diagram of the first embodiment of the control method for the motor drive circuit of the present utility model;

[0043] Figure 7 Overall schematic flow diagram of the control method for the motor drive circuit of the present utility model;

[0044] Figure 8 Schematic diagram of the module structure of the main control module in the air conditioner of the present utility model.

[0045] Explanation of the reference numerals in the drawings:

[0046]

[0047] Detailed implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0049] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not used to limit the present utility model. To enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0051] The present utility model provides a motor drive circuit. Refer to Figure 1 , Figure 1 which is a module structure diagram of the motor drive circuit of the present utility model. The motor drive circuit is respectively connected to a target motor M and a target load T; the motor drive circuit includes a drive module 100, a first switch module 200, and a kinetic energy recovery module 300; the drive module 100 is connected to the power supply terminal of the target motor M through the first switch module 200, the input terminal of the kinetic energy recovery module 300 is connected to the power supply terminal of the target motor M through the first switch module 200, and the output terminal of the kinetic energy recovery module 300 is connected to the target load T; wherein:

[0052] The first switch module 200 is used to respectively control the connections between the drive module 100, the kinetic energy recovery module 300 and the power supply terminal of the target motor M. Among them, the drive module 100 and the kinetic energy recovery module 300 are not simultaneously connected to the target motor M through the first switch module 200;

[0053] The drive module 100 is used to output an electrical signal to the target motor M to drive the target motor M to operate;

[0054] The kinetic energy recovery module 300 is used to charge through the electrical signal output by the target motor M and supply power to the target load T.

[0055] The target motor M is the driving object of the motor drive circuit.

[0056] The target load T is a related device that needs to be powered by the kinetic energy recovery module 300; for example, in an air conditioner, the target load T can be, but is not limited to, a display board, a hand controller, and a GPRS (General Packet Radio Service) module.

[0057] The drive module 100 outputs an electrical signal to the power supply terminal of the target motor M to control the operation of the target motor M. When the target motor M operates, it drives the fan blade to rotate; the specific implementation manner of the drive module 100 can be set according to actual needs.

[0058] When the target motor M is not driven by the driving module 100, that is, when the target motor M stops running, if the fan blade rotates, the target motor M will generate a back electromotive force and output a corresponding electrical signal through the power supply terminal; for example, when the target motor M switches from running to stopping, the driving module 100 stops driving the target motor M. Due to inertia, at this time, the fan blade will still rotate and gradually decelerate until it stops. During this period, the target motor M will generate a back electromotive force; another example is when the air conditioner is turned off, affected by the external environmental wind force, the fan blade will rotate. At this time, the target motor M will generate a back electromotive force.

[0059] When the target motor M generates a back electromotive force, the kinetic energy recovery module 300 can recover the electrical signal generated by the back electromotive force, that is, charge through the electrical signal, and then supply power to the target load T.

[0060] It can be understood that when the driving module 100 drives the target motor M to operate, if the kinetic energy recovery module 300 is also connected to the power supply terminal of the target motor M, the kinetic energy recovery module 300 will divert a part of the current, affecting the normal operation of the target motor M. At the same time, since the electrical signal output by the driving module 100 is relatively large, it is easy to damage the kinetic energy recovery module 300. Therefore, when the driving module 100 is connected to the power supply terminal of the target motor M, the connection between the kinetic energy recovery module 300 and the power supply terminal of the target motor M is disconnected; and when the kinetic energy recovery module 300 charges based on the electrical signal output by the target motor M, if the driving module 100 is also connected to the power supply terminal of the target motor M, the driving module 100 will divert a part of the current, reducing the charging efficiency of the kinetic energy recovery module 300. Therefore, when the kinetic energy recovery module 300 is connected to the power supply terminal of the target motor M, the connection between the driving module 100 and the power supply terminal of the target motor M is disconnected; that is, the driving module 100 and the kinetic energy recovery module 300 are not connected to the target motor M through the first switch module 200 at the same time.

[0061] In this embodiment, the first switch module 200 is set to control the specific module connected to the target motor M, and the driving module 100 drives the target motor M; when the target motor M generates a back electromotive force, the back electromotive force will charge the kinetic energy recovery module 300, so that the kinetic energy recovery module 300 can store the electrical energy of the back electromotive force of the target motor M, and then supply power to the target load T based on the stored electrical energy, realizing the reduction of the air conditioner power consumption.

[0062] Further, referring to Figure 2 , the first switch module 200 includes a first switch unit 210 and a second switch unit 220; where:

[0063] The first switch unit 210 is connected between the drive module 100 and the target motor M, and the second switch unit 220 is connected between the kinetic energy recovery module 300 and the target motor M.

[0064] The first switch unit 210 is used to control the connection relationship between the drive module 100 and the target motor M; the second switch unit 220 is used to control the connection relationship between the kinetic energy recovery module 300 and the target motor M.

[0065] Specifically, the target motor M includes three-phase power supply terminals U, V, and W. The target motor M is connected to the drive module 100 through three wires for the connection of the three-phase power supply terminals. Therefore, a first sub-switch t can be set on each wire in the first switch unit 210, so as to realize the control of the drive module 100 accessing the three-phase power supply terminals U, V, and W;

[0066] The target motor M is connected to the kinetic energy recovery module 300 through three wires for the connection of the three-phase power supply terminals. Therefore, a second sub-switch T can be set on each wire in the second switch unit 220, so as to realize the control of the kinetic energy recovery module 300 accessing the three-phase power supply terminals U, V, and W.

[0067] Furthermore, the target motor M includes three-phase power supply terminals; the kinetic energy recovery module 300 includes a recovery unit; where:

[0068] The recovery unit is connected to any two-phase power supply terminals of the target motor M through the second switch unit.

[0069] In this embodiment, one recovery unit and one recovery switch are provided. It can be understood that when the target motor M generates a back electromotive force, a current output will be generated between any two-phase power supply terminals of the target motor M. Therefore, when setting the kinetic energy recovery module 300, it can be connected to any two-phase power supply terminals of the target motor M through the recovery switch, so as to realize the charging of the kinetic energy recovery module 300. In practical applications, the specific connected power supply terminals can be connected based on actual needs. For example, the recovery unit is connected to the U and V two-phase power supply terminals of the target motor M through the recovery switch, or the recovery unit is connected to the U and W two-phase power supply terminals of the target motor M through the recovery switch, or the recovery unit is connected to the W and V two-phase power supply terminals of the target motor M through the recovery switch.

[0070] In this embodiment, by providing one recovery unit connected to any two-phase power supply terminals of the target motor M, the charging of the kinetic energy recovery module 300 is realized on the basis of reducing the setting cost.

[0071] Further, the target motor M includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit 220 includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module 300 includes a recovery unit; wherein:

[0072] The recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor M through the first recovery switch;

[0073] The recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor M through the second recovery switch;

[0074] The recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor M through the third recovery switch.

[0075] In this embodiment, one recovery unit and three recovery switches are provided. It can be understood that when the target motor M generates a back electromotive force, a current output will be generated between any two-phase power supply terminals. However, affected by the specific environment, the current magnitudes generated between different two-phase power supply terminals may be different. Therefore, the recovery unit can be connected to different two-phase power supply terminals through three recovery switches respectively, so that by closing the appropriate recovery switch, the two-phase power supply terminals specifically connected to the recovery unit can be selected to achieve the best charging effect.

[0076] Further, the target motor M includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit 220 includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module 300 includes three recovery units, namely a first recovery unit, a second recovery unit, and a third recovery unit; wherein:

[0077] The first recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor M through the first recovery switch;

[0078] The second recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor M through the second recovery switch;

[0079] The third recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor M through the third recovery switch.

[0080] In this embodiment, three recovery units and three recovery switches are provided. It can be understood that when the target motor M generates a back electromotive force, a current output will be generated between any two-phase power supply terminals; therefore, in this embodiment, a recovery unit is connected to any two-phase power supply terminals; thus, when the motor has a back electromotive force, charging is carried out simultaneously through the three recovery units; that is, the first recovery unit is charged by the current output from the U and V two-phase power supply terminals, the second recovery unit is charged by the current output from the U and W two-phase power supply terminals, and the third recovery unit is charged by the current output from the W and V two-phase power supply terminals.

[0081] In this embodiment, although setting three recovery units increases the cost to a certain extent, it can achieve the maximum charging efficiency.

[0082] It can be understood that the kinetic energy recovery module 300 is connected to the three-phase power supply terminals of the target motor M through the second switch unit 220. Since the specific recovery units need to be connected to two-phase power supply terminals of the motor M respectively, the second sub-switches T included in the second switch unit 220 can be combined to obtain the corresponding recovery switches; for example, the second sub-switch T includes T1, T2, and T3; the three second sub-switches T are respectively connected to the three-phase power supply terminals U, V, and W of the motor M; the first recovery unit is connected to U and V, so T1 and T2 form the first recovery switch to control the connection between the first recovery unit and U and V; similarly, the second recovery unit is connected to U and W, so T1 and T3 form the second recovery switch to control the connection between the second recovery unit and U and W; the third recovery unit is connected to V and W, so T2 and T3 form the third recovery switch to control the connection between the third recovery unit and V and W.

[0083] Further, referring to Figure 3 , the recovery unit includes a switching transistor Q, an inductor L, a diode D, and a capacitor C; where:

[0084] The input end of the switching transistor Q is connected to one-phase power supply terminal of the target motor M, the output end of the switching transistor Q is connected to the other-phase power supply terminal of the target motor M through the inductor L, the output end of the switching transistor Q is also connected to the negative electrode of the diode D, the positive electrode of the diode D is connected to the other-phase power supply terminal of the target motor M through the capacitor C, and the capacitor C is connected in parallel with the target load T.

[0085] When the switching transistor Q is turned on, the voltage output from one-phase power supply terminal of the motor flows through the switching transistor Q and the inductor L and then returns to the other-phase power supply terminal of the motor, and the inductor L is charged; at the same time, since the voltage at the negative electrode of the diode D is higher than the voltage at the positive electrode of the diode D, the diode D is turned off and the capacitor C is not charged.

[0086] When the switching transistor Q is turned off, the voltage of the motor cannot be input. At this time, the diode D conducts, and the voltage on the inductor L returns to the inductor L through the capacitor C and the diode D, and the inductor L charges the capacitor C.

[0087] When setting a recovery switch for the recovery unit, a recovery switch can be set between the motor and the switching transistor Q. When the recovery switch is off, the electrical signal of the motor cannot be input to the recovery unit. When the recovery switch is on, the electrical signal of the motor can be input to the recovery unit.

[0088] Further, referring to Figure 4 , the first switch module 200 further includes a current detection unit, a main control unit, and a third switch unit. The detection ends of the current detection unit are respectively connected to the three-phase power supply ends of the target motor M. The output end of the current detection unit is connected to the input end of the main control unit. The output end of the main control unit is connected to the control end of the third switch unit. The third switch unit is respectively connected to the three-phase power supply ends of the target motor M; wherein:

[0089] The current detection unit is configured to detect the current of each phase at the three-phase power supply ends of the target motor M and send the detection result to the main control unit;

[0090] The main control unit is configured to determine the target two-phase power supply ends of the target motor M corresponding to the phase current with the minimum current according to the detection result, and send a closing signal to the third switch unit to enable the third switch unit to connect the target two-phase power supply ends.

[0091] The main control unit is used to realize the control of the third switch unit; it can be understood that the main control unit can be the main control module 400 in the air conditioner, or a device specially set for the first switch module 200 for data processing.

[0092] It can be understood that generally, when the target motor M stops, that is, when the drive module 100 stops driving the target motor M, the currents at the three-phase power supply ends of the target motor M are the same; however, due to faults, interference, or environmental impacts, the currents output by the three-phase power supply ends of the target motor M may be uneven; and during the stage from when the target motor M stops to when it completely stops, it is necessary to short-circuit the two-phase power supply ends of the target motor M to brake the target motor M, thereby generating a back electromotive force; and when the currents output by the three-phase power supply ends of the target motor M are uneven, the larger current may damage the target motor M. Therefore, in this embodiment, a current detection unit is provided to detect the current of each phase at the three-phase power supply ends of the target motor M; and determine the target two-phase power supply ends of the target motor M corresponding to the phase current with the minimum current, and then short-circuit the target two-phase power supply ends to brake the target motor M, thereby improving the safety of braking the target motor M.

[0093] The specific structure of the current detection unit can be set according to actual needs.

[0094] When specifically setting, the third switch unit may include three third sub-switches S, and each third sub-switch S is respectively connected between the two-phase power supply terminals of the target motor M. By closing any one of the third sub-switches S, the short circuit between the corresponding two-phase power supply terminals can be realized.

[0095] The present utility model also protects an air conditioner, which includes a target motor M, a target load T, and a motor drive circuit. The structure of the motor drive circuit can refer to the above-mentioned embodiments and will not be elaborated here. Naturally, since the air conditioner in this embodiment adopts the technical solution of the above-mentioned motor drive circuit, this air conditioner has all the beneficial effects of the above-mentioned motor drive circuit.

[0096] Further, referring to Figure 5 , the air conditioner further includes a main control module 400 and a signal receiving module 500; a first input end of the main control module 400 is connected to the signal receiving module 500, and a first output end of the main control module 400 is connected to a control end of a first switch module 200 in the motor drive circuit; wherein:

[0097] The main control module 400 is configured to determine the operating state of the target motor M according to the signal received by the signal receiving module 500;

[0098] and send a first control signal to the first switch module 200 according to the operating state;

[0099] The first switch module 200 is configured to connect the drive module 100 or the kinetic energy recovery module 300 to the power supply terminal of the target motor M according to the first control signal.

[0100] The signal receiving module 500 is configured to output the air conditioner control signal it receives to the main control module 400; for example, when the user needs to turn on the air conditioner, a power-on signal is sent to the signal receiving module 500, and when the user needs to turn off the air conditioner, a power-off signal is sent to the signal receiving module 500; and in different modes of the air conditioner, the operating state of the target motor M is determined. For example, when the air conditioner is turned on for heating or cooling, the operating state of the target motor M is running, that is, it is driven by the drive module 100, and when the air conditioner is turned on but not performing temperature control or the air conditioner is turned off, the operating state of the target motor M is stopped; therefore, based on the signal received by the signal receiving module 500, the operating state of the target motor M can be determined.

[0101] It can be understood that when the target motor M operates, the driving module 100 drives the target motor M, so as to realize the operation of the target motor M. Therefore, at this time, the first switch module 200 connects the driving module 100 to the power supply terminal of the target motor M, and disconnects the kinetic energy recovery module 300 from the power supply terminal of the target motor M.

[0102] When the target motor M does not operate, the driving module 100 does not drive the target motor M. Therefore, the first switch module 200 disconnects the driving module 100 from the power supply terminal of the target motor M; when the target motor M does not operate, it may have a back electromotive force. Therefore, the kinetic energy recovery module 300 is connected to the power supply terminal of the target motor M, so as to charge based on the back electromotive force generated by the target motor M.

[0103] The first control signal is used to instruct the first switch module 200 to connect the driving module 100 or the kinetic energy recovery module 300 to the power supply terminal of the target motor M.

[0104] In this embodiment, the operating state of the target motor M is determined by the signal received by the signal receiving module 500, and the module specifically connected to the power supply terminal of the target motor M is determined based on the operating state, so that the state of the first switch module 200 can meet the actual needs of the target motor M.

[0105] Furthermore, the air conditioner further includes a current detection module 600, a second switch module 700, and an air conditioner power supply 800. The detection end of the current detection module 600 is connected to the output end of the kinetic energy recovery module 300. The output end of the current detection module 600 is connected to the second input end of the main control module 400. The second output end of the main control module 400 is connected to the control end of the second switch module 700. The second switch module 700 is respectively connected to the kinetic energy recovery module 300, the target load T, and the air conditioner power supply 800;

[0106] The main control module 400 is configured to judge the power state of the kinetic energy recovery module 300 according to the output current of the kinetic energy recovery module 300 detected by the current detection module 600, and send a second control signal to the second switch module 700 according to the power state;

[0107] The second switch module 700 is configured to connect the kinetic energy recovery module 300 or the air conditioner power supply 800 to the target load T according to the second control signal.

[0108] The air conditioner power supply 800 is the main power supply in the air conditioner; the air conditioner power supply 800 is powered by the mains and provides electrical energy for the electrical appliances in the air conditioner.

[0109] It can be understood that the back electromotive force of the target motor M is not constantly provided and can only be generated under specific conditions. Therefore, the power state of the kinetic energy recovery module 300 cannot support a long-term and constant supply for the target load T. Thus, in this embodiment, the current detection module 600 is used to detect the power state of the kinetic energy recovery module 300. Specifically, the power stored in the capacitor C in the kinetic energy recovery module 300 is detected, and based on the power state, it is determined whether to connect to the air conditioner power supply 800 to supply power to the target load T. Specifically, when the power of the kinetic energy recovery module 300 is relatively sufficient, the kinetic energy recovery module 300 is connected through the second switch module 700 to supply power to the target load T. When the power of the kinetic energy recovery module 300 is insufficient, the second switch module 700 is used to switch to the air conditioner power supply 800 to supply power to the target load T. When making a specific determination, a preset power threshold can be set. When the remaining power of the power state of the kinetic energy recovery module 300 is less than the preset power threshold, it is considered that the power of the kinetic energy recovery module 300 is insufficient. When the remaining power of the power state of the kinetic energy recovery module 300 is greater than or equal to the preset power threshold, it is considered that the power of the kinetic energy recovery module 300 is sufficient.

[0110] In this embodiment, by setting the current detection module 600 to detect the power state of the kinetic energy recovery module 300, and being able to switch the kinetic energy recovery module 300 and the air conditioner power supply 800 to supply power to the target load T based on the power state, while reducing power consumption, it ensures the power supply requirement of the target load T and avoids power outage of the target load T due to insufficient power of the kinetic energy recovery module 300.

[0111] The present utility model provides a method for controlling a motor drive circuit. Referring to Figure 6 , Figure 6 is a schematic flowchart of the first embodiment of the method for controlling the motor drive circuit of the present utility model. The method for controlling the motor drive circuit is applied to the motor drive circuit or the air conditioner as described above. The method for controlling the motor drive circuit includes:

[0112] Step S10, determining the operating state of the target motor and determining a first control signal according to the operating state;

[0113] Step S20, sending the first control signal to the first switch module so that the first switch module connects the drive module or the kinetic energy recovery module to the power supply terminal of the target motor according to the first control signal.

[0114] The signal receiving module is used to output the received air conditioner control signal to the main control module. For example, when the user needs to turn on the air conditioner, a startup signal is sent to the signal receiving module, and when the user needs to turn off the air conditioner, a shutdown signal is sent to the signal receiving module. In different modes of the air conditioner, the operating state of the target motor is determined. For example, when the air conditioner is turned on for heating or cooling, the operating state of the target motor is running, that is, it is driven by the driving module. When the air conditioner is turned on but not performing temperature control or the air conditioner is turned off, the operating state of the target motor is stopped. Therefore, based on the signal received by the signal receiving module, the operating state of the target motor can be determined.

[0115] The first control signal is used to instruct the first switch module to connect the driving module or the kinetic energy recovery module to the power supply terminal of the target motor.

[0116] In this embodiment, by setting the first switch module to control the specific module connected to the target motor, the driving module drives the target motor. When the target motor generates a back electromotive force, the back electromotive force will charge the kinetic energy recovery module, so that the kinetic energy recovery module can store the electrical energy of the back electromotive force of the target motor, and then supply power to the target load based on the stored electrical energy, realizing the reduction of the power consumption of the air conditioner.

[0117] Further, referring to Figure 7 , the step S10 includes:

[0118] Step S11, determining whether the operating state is motor running;

[0119] Step S12, if the operating state is motor running, the first control signal correspondingly connects the driving module to the power supply terminal of the target motor;

[0120] Step S13, if the operating state is motor stopped, the first control signal correspondingly connects the kinetic energy recovery module to the power supply terminal of the target motor.

[0121] It can be understood that when the target motor is running, the driving module drives the target motor to realize the action of the target motor. Therefore, at this time, the first switch module connects the driving module to the power supply terminal of the target motor and disconnects the kinetic energy recovery module from the power supply terminal of the target motor.

[0122] When the target motor is stopped, the driving module does not drive the target motor. Therefore, the first switch module disconnects the driving module from the power supply terminal of the target motor. When the target motor is not running, it may have a back electromotive force. Therefore, the kinetic energy recovery module is connected to the power supply terminal of the target motor to charge based on the back electromotive force generated by the target motor.

[0123] In this embodiment, by means of the module that determines the specific connection to the power supply terminal of the target motor based on the operating state, the state of the first switch module can meet the actual needs of the target motor.

[0124] Further, the motor drive circuit control method further includes:

[0125] Step S30: Obtain the output current of the kinetic energy recovery module detected by the current detection unit, and determine the power state of the kinetic energy recovery module according to the output current;

[0126] Step S40: Determine the second control signal corresponding to the power state, and send the second control signal to the second switch module, so that the second switch module connects the kinetic energy recovery module or the air-conditioning power supply to the target load according to the second control signal.

[0127] It can be understood that the back electromotive force of the target motor is not constantly provided and can only be generated under specific conditions. Therefore, the power state of the kinetic energy recovery module cannot support a long-term and constant supply for the target load. Therefore, in this embodiment, the current detection module is used to detect the power state of the kinetic energy recovery module. Specifically, the power stored in the capacitor in the kinetic energy recovery module is detected; and based on the power state, it is judged whether it is necessary to connect the air-conditioning power supply to supply power to the target load. Specifically, when the power of the kinetic energy recovery module is relatively sufficient, the kinetic energy recovery module is connected through the second switch module to supply power to the target load, and when the power of the kinetic energy recovery module is insufficient, the second switch module switches to the air-conditioning power supply to supply power to the target load.

[0128] Further, the step S40 includes:

[0129] Step S41: Obtain the remaining power corresponding to the power state, and judge whether the remaining current is less than a preset power threshold;

[0130] Step S42: If the remaining current is less than the preset power threshold, the second control signal correspondingly connects the air-conditioning power supply to the target load;

[0131] Step S43: If the remaining current is greater than or equal to the preset power threshold, the second control signal correspondingly connects the kinetic energy recovery module to the target load.

[0132] In this embodiment, a preset power threshold is set. When the remaining power of the power state of the kinetic energy recovery module is less than the preset power threshold, it is considered that the power of the kinetic energy recovery module is insufficient. Therefore, the air conditioner power supply is connected to the target load to supply power to the target load; when the remaining power of the power state of the kinetic energy recovery module is greater than or equal to the preset power threshold, it is considered that the power of the kinetic energy recovery module is sufficient. Therefore, the kinetic energy recovery module is connected to the target load to supply power to the target load.

[0133] In this embodiment, a current detection module is set to detect the power state of the kinetic energy recovery module, and the kinetic energy recovery module and the air conditioner power supply can be switched to supply power to the target load based on the power state, so as to reduce power consumption while ensuring the power supply requirement of the target load and avoiding power failure of the target load due to insufficient power of the kinetic energy recovery module.

[0134] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0135] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of this application.

[0136] Refer to Figure 8 , in terms of the hardware structure, the main control module may include components such as a communication module 10, a memory 20, and a processor 30. In the main control module, the processor 30 is respectively connected to the memory 20 and the communication module 10. A computer program is stored on the memory 20, and the computer program is simultaneously executed by the processor 30. When the computer program is executed, the steps of the above method embodiments are implemented.

[0137] The communication module 10 can be connected to an external communication device through a network. The communication module 10 can receive requests sent by the external communication device, and can also send requests, instructions, and information to the external communication device. The external communication device can be other main control modules, servers, or Internet of Things devices, such as televisions, etc.

[0138] The memory 20 can be used to store software programs and various data. The memory 20 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as determining the operating state of the target motor), etc.; the data storage area can include a database, and the data storage area can store data or information created according to the use of the system, etc. In addition, the memory 20 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0139] The processor 30 is the control center of the main control module, and connects various parts of the entire main control module using various interfaces and circuits. By running or executing the software programs and / or modules stored in the memory 20, and by calling the data stored in the memory 20, it executes various functions of the main control module and processes data, thereby monitoring the main control module as a whole. The processor 30 can include one or more processing units; optionally, the processor 30 can integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes the operating system, user interface, and application programs, etc., and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 30.

[0140] Although Figure 8 not shown, the above main control module may further include a circuit control module, and the circuit control module is used to connect to a power supply to ensure the normal operation of other components. Those skilled in the art can understand that Figure 8 the structure of the main control module shown in

[0141] does not constitute a limitation on the main control module, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements. Figure 8The memory 20 in the main control module may also be at least one of ROM (Read-Only Memory), RAM (Random Access Memory), magnetic disk, and optical disk. The computer-readable storage medium includes several instructions for causing a terminal device with a processor (which may be a TV, a car, a mobile phone, a computer, a server, a terminal, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

[0142] In the present invention, the terms "first", "second", "third", "fourth", and "fifth" are used only for the purpose of description and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0143] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0144] Although the embodiments of the present invention have been shown and described above, the scope of protection of the present invention is not limited thereto. It can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, and substitutions to the above embodiments within the scope of the present invention, and these changes, modifications, and substitutions should all be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be subject to the scope of protection of the claims.

Claims

1. A motor drive circuit, characterized in that, The motor drive circuit is respectively connected to the target motor and the target load; the motor drive circuit includes a drive module, a first switch module, and a kinetic energy recovery module; the drive module is connected to the power supply terminal of the target motor through the first switch module, the input terminal of the kinetic energy recovery module is connected to the power supply terminal of the target motor through the first switch module, and the output terminal of the kinetic energy recovery module is connected to the target load; wherein: The first switch module is used to respectively control the connections between the drive module, the kinetic energy recovery module and the power supply terminal of the target motor. Among them, the drive module and the kinetic energy recovery module are not connected to the target motor through the first switch module at the same time; The drive module is used to output an electrical signal to the target motor to drive the target motor to operate; The kinetic energy recovery module is used to charge through the electrical signal output by the target motor and supply power to the target load.

2. The motor drive circuit according to claim 1, characterized in that, The first switch module includes a first switch unit and a second switch unit; wherein: The first switch unit is connected between the drive module and the target motor, and the second switch unit is connected between the kinetic energy recovery module and the target motor.

3. The motor drive circuit according to claim 2, wherein The target motor includes a three-phase power supply terminal; the kinetic energy recovery module includes a recovery unit; wherein: The recovery unit is connected to any two-phase power supply terminals of the target motor through the second switch unit.

4. The motor drive circuit according to claim 2, wherein The target motor includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module includes a recovery unit; wherein: The recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor through the first recovery switch; The recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor through the second recovery switch; The recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor through the third recovery switch.

5. The motor drive circuit according to claim 2, wherein The target motor includes a first-phase power supply terminal, a second-phase power supply terminal, and a third-phase power supply terminal; the second switch unit includes a first recovery switch, a second recovery switch, and a third recovery switch, and the kinetic energy recovery module includes three recovery units, namely a first recovery unit, a second recovery unit, and a third recovery unit; wherein: The first recovery unit is connected to the first-phase power supply terminal and the second-phase power supply terminal of the target motor through the first recovery switch; The second recovery unit is connected to the first-phase power supply terminal and the third-phase power supply terminal of the target motor through the second recovery switch; The third recovery unit is connected to the second-phase power supply terminal and the third-phase power supply terminal of the target motor through the third recovery switch.

6. The motor drive circuit according to any one of claims 3 to 5, characterized in that, The recovery unit includes a switch tube, an inductor, a diode, and a capacitor; wherein: The input end of the switching tube is connected to a power supply end of one phase of the target motor. The output end of the switching tube is connected to a power supply end of another phase of the target motor through the inductor. The output end of the switching tube is also connected to the negative electrode of the diode. The positive electrode of the diode is connected to the power supply end of another phase of the target motor through the capacitor. The capacitor is connected in parallel with the target load.

7. The motor drive circuit according to claim 2, characterized in that, The first switching module further includes a current detection unit, a main control unit, and a third switching unit. The detection ends of the current detection unit are respectively connected to the power supply ends of the three phases of the target motor. The output end of the current detection unit is connected to the input end of the main control unit. The output end of the main control unit is connected to the control end of the third switching unit. The third switching unit is respectively connected to the power supply ends of the three phases of the target motor. Wherein: The current detection unit is configured to detect the current of each phase of the power supply ends of the three phases of the target motor, and send the detection result to the main control unit. The main control unit is configured to determine the target two-phase power supply ends of the target motor corresponding to the phase current with the minimum current according to the detection result, and send a closing signal to the third switching unit to enable the third switching unit to connect the target two-phase power supply ends.

8. An air conditioner, characterized in that, The air conditioner includes a target motor, a target load, and a motor drive circuit according to any one of claims 1 to 7.

9. The air conditioner according to claim 8, characterized in that, The air conditioner further includes a main control module and a signal receiving module. The first input end of the main control module is connected to the signal receiving module. The first output end of the main control module is connected to the control end of the first switching module in the motor drive circuit. Wherein: The main control module is configured to determine the operating state of the target motor according to the signal received by the signal receiving module. And send a first control signal to the first switching module according to the operating state. The first switching module is configured to connect the drive module or the kinetic energy recovery module to the power supply end of the target motor according to the first control signal.

10. The air conditioner according to claim 9, wherein, The air conditioner further includes a current detection module, a second switching module, and an air conditioner power supply. The detection end of the current detection module is connected to the output end of the kinetic energy recovery module. The output end of the current detection module is connected to the second input end of the main control module. The second output end of the main control module is connected to the control end of the second switching module. The second switching module is respectively connected to the kinetic energy recovery module, the target load, and the air conditioner power supply. The main control module is configured to judge the power state of the kinetic energy recovery module according to the output current of the kinetic energy recovery module detected by the current detection module, and send a second control signal to the second switching module according to the power state. The second switching module is configured to connect the kinetic energy recovery module or the air conditioner power supply to the target load according to the second control signal.

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