Air conditioner motor driving system integrated with vehicle-mounted charger, method and electric vehicle

Abstract

The invention relates to the technical field of air conditioner control, and discloses an air conditioner motor driving system integrated with a vehicle-mounted charger, a method and an electric vehicle, the air conditioner motor driving system comprises a motor driving unit, a first switch unit, an air conditioner motor, the vehicle-mounted charger and a controller; the output end of the motor driving unit is connected with an air conditioner motor; the alternating current output end of the vehicle-mounted charger is connected with the air conditioner motor through the first switch unit. The controller is connected with the control end of the first switch unit and used for controlling the air conditioner motor driving system integrated with the vehicle-mounted charger to be in the non-charging working condition according to the power requirement of the air conditioner motor when the air conditioner motor driving system integrated with the vehicle-mounted charger is in the non-charging working condition. When the power requirement is larger than the maximum output power of the motor driving unit, the bridge arm of the vehicle-mounted charger and the bridge arm of the motor driving unit are used for jointly driving the air conditioner motor. On the premise of not changing the winding in the air conditioner motor, the output power of the air conditioner motor is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning control, and in particular to an air-conditioning motor drive system and method integrated with an on-board charger, and an electric vehicle. Background Art

[0002] As air conditioners are used more and more widely in different fields, users have also put forward higher requirements for air conditioner motor drive circuits.

[0003] The traditional air-conditioning motor drive circuit drives and controls the air-conditioning motor through its own motor drive unit. This air-conditioning motor drive circuit has a major defect. Because the maximum output power of the air-conditioning motor controlled by the motor drive unit is fixed, the output power of the air-conditioning motor can only be increased by increasing the number of turns of the winding in the air-conditioning motor (this design method will increase the volume of the air-conditioning motor). Therefore, there is an urgent need for a new air-conditioning motor drive circuit to increase the output power of the air-conditioning motor without changing the winding in the air-conditioning motor.

[0004] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to propose an air-conditioning motor drive system, method and electric vehicle integrated with an on-board charger, aiming to solve the technical problem of how to increase the output power of the air-conditioning motor without changing the windings in the air-conditioning motor.

[0006] To achieve the above objectives, the present invention provides an air-conditioning motor drive system integrated with an on-board charger, the air-conditioning motor drive system integrated with the on-board charger comprising:

[0007] Motor drive unit, first switch unit, air-conditioning motor and on-board charger, controller;

[0008] The output end of the motor drive unit is connected to the air-conditioning motor;

[0009] The AC output end of the on-board charger is connected to the air-conditioning motor via the first switch unit;

[0010] The controller is connected to the control terminal of the first switch unit and is used to:

[0011] When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging condition, the on / off state of each switch in the first switch unit is controlled according to the power demand of the air-conditioning motor, so that when the power demand is greater than the maximum output power of the motor drive unit, the bridge arm of the on-board charger and the bridge arm of the motor drive unit are used to jointly drive the air-conditioning motor.

[0012] In one embodiment, the air-conditioning motor is a three-phase motor including three motor windings, the motor drive unit includes three-phase drive bridge arms corresponding one to one to the three motor windings, and the on-board charger includes a three-phase AC output terminal;

[0013] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switching unit;

[0014] The controller is specifically used to: when it is monitored that the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit to be turned on, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the three-phase motor.

[0015] In one embodiment, the first switch unit includes a first single-pole double-throw switch, a second single-pole double-throw switch, and a first single-pole single-throw switch;

[0016] The movable contact of the first single-pole double-throw switch is connected to the second end of the first motor winding among the motor windings, the first fixed contact of the first single-pole double-throw switch is connected to the first phase AC output end among the three-phase AC output ends, the second fixed contact of the first single-pole double-throw switch is connected to the second end of the second motor winding among the motor windings, and the control end of the first single-pole double-throw switch is connected to the controller;

[0017] The movable contact of the second single-pole double-throw switch is connected to the second end of the third motor winding among the motor windings, the first fixed contact of the second single-pole double-throw switch is connected to the third phase AC output terminal among the three-phase AC output terminals, the second fixed contact of the second single-pole double-throw switch is connected to the second end of the second motor winding, and the control terminal of the second single-pole double-throw switch is connected to the controller;

[0018] The first end of the first single-pole single-throw switch is connected to the second end of the second motor winding, the second end of the first single-pole single-throw switch is connected to the second phase AC output end of the three-phase AC output end, and the control end of the first single-pole single-throw switch is connected to the controller.

[0019] In one embodiment, the air conditioner motor drive system integrated with the on-board charger further includes a second switch unit;

[0020] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via the second switch unit, and the second ends of the three motor windings are connected to the three-phase AC output end of the on-board charger via the first switch unit;

[0021] The controller is also used to: when a fault is detected in the motor drive unit, by controlling the on / off state of each switch in the first switch unit and the second switch unit, use the bridge arm of the on-board charger to replace the faulty bridge arm in the motor drive unit to drive the air-conditioning motor.

[0022] In one embodiment, the second switch unit includes a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a second single-pole single-throw switch;

[0023] The movable contact of the third single-pole double-throw switch is connected to the first end of the first motor winding among the motor windings, the first fixed contact of the third single-pole double-throw switch is connected to the midpoint of the bridge arm of the first drive bridge arm among the three-phase drive bridge arms, the second fixed contact of the third single-pole double-throw switch is connected to the first end of the second motor winding among the motor windings, and the control end of the third single-pole double-throw switch is connected to the controller;

[0024] The movable contact of the fourth single-pole double-throw switch is connected to the first end of the third motor winding among the motor windings, the first fixed contact of the fourth single-pole double-throw switch is connected to the midpoint of the bridge arm of the third drive bridge arm among the three-phase drive bridge arms, the second fixed contact of the fourth single-pole double-throw switch is connected to the first end of the second motor winding, and the control end of the fourth single-pole double-throw switch is connected to the controller;

[0025] The first end of the second single-pole single-throw switch is connected to the first end of the second motor winding, the second end of the second single-pole single-throw switch is connected to the midpoint of the second drive bridge arm in the three-phase drive bridge arm, and the control end of the second single-pole single-throw switch is connected to the controller.

[0026] In one embodiment, the air conditioner motor is a six-phase motor including six motor windings, the second ends of the three motor windings being connected together to form two three-phase windings, the motor drive unit including a three-phase drive bridge arm corresponding one-to-one to the three motor windings in one three-phase winding, and the on-board charger including a three-phase AC output end corresponding one-to-one to the three motor windings in another three-phase winding;

[0027] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected to the three-phase AC output end via the first switching unit;

[0028] The controller is specifically used to: when it is monitored that the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit to be turned on, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the six-phase motor.

[0029] In one embodiment, the first switch unit includes three third single-pole single-throw switches, the first ends of the three third single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three third single-pole single-throw switches are respectively connected to the three-phase AC output ends in a one-to-one correspondence.

[0030] In addition, to achieve the above-mentioned purpose, a method for driving an air conditioner motor integrated with an on-board charger is also provided. The method for driving an air conditioner motor integrated with an on-board charger is applied to the above-mentioned air conditioner motor drive system integrated with an on-board charger. The method for driving an air conditioner motor integrated with an on-board charger includes:

[0031] When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state, the on / off state of each switch in the first switch unit is controlled according to the power demand of the air-conditioning motor, specifically including:

[0032] When the power demand is greater than the maximum output power of the motor drive unit, each switch in the first switch unit is controlled to be in an on state, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the air conditioner motor;

[0033] When the power demand is less than or equal to the maximum output power of the motor drive unit, each switch in the first switch unit is controlled to be in an off state.

[0034] In one embodiment, the air conditioner motor driving method integrated with the on-board charger further includes:

[0035] When the air-conditioning motor drive system integrated with the on-board charger is in a charging state, each switch in the first switch unit is controlled to be in an off state.

[0036] In addition, to achieve the above-mentioned purpose, an electric vehicle is also provided, which includes the air-conditioning motor drive system integrated with the on-board charger as described above.

[0037] The present application provides an air-conditioning motor drive system integrated with an on-board charger, the system comprising a motor drive unit, a first switch unit, an air-conditioning motor and an on-board charger, and a controller; the output end of the motor drive unit is connected to the air-conditioning motor; the AC output end of the on-board charger is connected to the air-conditioning motor via the first switch unit; the controller is connected to the control end of the first switch unit, and is used to: when the air-conditioning motor drive system integrated with the on-board charger is in a non-charging condition, control the on / off state of each switch in the first switch unit according to the power demand of the air-conditioning motor, so that when the power demand is greater than the maximum output power of the motor drive unit, the bridge arm of the on-board charger and the bridge arm of the motor drive unit are used to jointly drive the air-conditioning motor. The output end of the motor drive unit is connected to the air-conditioning motor; the AC output end of the on-board charger is connected to the air-conditioning motor via the first switch unit, so that when the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state, the controller controls the on / off state of each switch in the first switch unit to use the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the air-conditioning motor to achieve maximum power output (the principle is that when the motor drive unit is driven, each winding in the air-conditioning motor is divided into times the supply voltage, and when the motor drive unit and the bridge arm in the on-board charger are driven simultaneously, each winding in the air-conditioning motor receives 1 times the supply voltage. Because the output power of the air-conditioning motor is positively correlated with the voltage received by each winding, the purpose of increasing the output power of the air-conditioning motor is achieved). This avoids the problem of only being able to increase the number of turns of the winding in the air-conditioning motor to increase the output power of the air-conditioning motor, and increases the output power of the air-conditioning motor without changing the winding in the air-conditioning motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of the air-conditioning motor drive system integrated with the on-board charger of the present invention;

[0039] Figure 2 A circuit connection diagram of a motor drive unit in the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0040] Figure 3 A schematic diagram of a frame of an on-board charger in an electric vehicle of the present invention;

[0041] Figure 4 This is a circuit connection diagram of a first embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0042] Figure 5 This is a first control schematic diagram of a first embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0043] Figure 6This is a second control schematic diagram of the first embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present invention;

[0044] Figure 7 This is a circuit connection diagram of a second embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0045] Figure 8 This is a first control schematic diagram of a second embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0046] Figure 9 This is a second control schematic diagram of a second embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0047] Figure 10 This is a circuit connection diagram of a third embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0048] Figure 11 This is a circuit control diagram of a third embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention;

[0049] Figure 12 The figure is a flow chart of the air conditioner motor driving method integrated with the on-board charger of the present invention.

[0050] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0051] Description of Figure Numbers:

[0052] 50. On-board charger; 51. Power factor correction circuit; 10. (Three-phase, six-phase) air-conditioning motor; 20. Motor drive unit; 30. First switch unit; 40. Controller; 60. Power supply; 70. Second switch unit; VL, AC output terminal; Udc, DC power supply; C, capacitor; 21. First drive bridge arm; 22. Second drive bridge arm; 23. Third drive bridge arm; Q1, first MOS transistor; Q2, second MOS transistor; Q3, third MOS transistor; Q4, fourth MOS transistor; Q5, fifth MOS transistor; Q6, sixth MOS transistor; L1, first motor winding; L2, second motor winding; L3, third motor winding; L4, fourth motor winding Winding; L5, fifth motor winding; L6, sixth motor winding; VL1, first AC output terminal; VL2, second AC output terminal; VL3, third AC output terminal; D1, first switch; D2, second switch; K1, first single-pole single-throw switch; K2, second single-pole single-throw switch; K3-K5, third single-pole single-throw switch; S1, first single-pole double-throw switch; S2, second single-pole double-throw switch; S3, third single-pole double-throw switch; S4, fourth single-pole double-throw switch; S2, resonant converter; VG1, first AC input terminal; VG2, second AC input terminal; VG3, third AC input terminal; D3, third switch; D4, fourth switch; D5, fifth switch. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0054] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0057] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0058] The existing air-conditioning motor drive circuit drives and controls the air-conditioning motor through its own motor drive unit. However, since the maximum output power of the air-conditioning motor controlled by the motor drive unit is fixed, there is a problem that the output power of the air-conditioning motor can only be increased by increasing the number of turns of the winding in the air-conditioning motor (this design method will increase the volume of the air-conditioning motor). Because this design method not only increases the volume of the air-conditioning motor, but also increases the cost of the air-conditioning motor by adding windings, based on the above problems, the air-conditioning motor drive system integrated with the on-board charger of the present invention is proposed.

[0059] The present invention provides a first embodiment of an air-conditioning motor drive system integrated with a vehicle charger, referring to Figure 1 The schematic diagram of the structure of the air-conditioning motor drive system integrated with the on-board charger includes:

[0060] Motor drive unit 20, first switch unit 30, air conditioning motor 10 and vehicle charger 50, controller 40;

[0061] The output end of the motor drive unit 20 is connected to the air conditioner motor;

[0062] The AC output terminal VL of the on-board charger 50 is connected to the air conditioning motor 10 via the first switch unit 30;

[0063] The controller 40 is connected to the control terminal of the first switch unit 30 and is used to:

[0064] When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state, the on / off state of each switch in the first switch unit 30 is controlled according to the power demand of the air-conditioning motor 10, so that when the power demand is greater than the maximum output power of the motor drive unit, the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 are used to jointly drive the air-conditioning motor 10.

[0065] In this embodiment, the output end of the motor drive unit 20 is connected to the air conditioning motor 10 so that the air conditioning motor 10 is normally driven by the motor drive unit 20. At the same time, the air conditioning motor 10 is also connected to the AC output end VL of the power factor correction circuit 51 in the on-board charger 50 through the first switch unit 30. The first switch unit 30 can be controlled to be on or off to establish or disconnect the air conditioning motor 10 from the power factor correction circuit 51. This allows the motor drive unit 20 and / or the on-board charger 50 to be normally selected to drive the air conditioning motor 10, thereby expanding the control functionality of the air conditioning motor 10. That is, the motor drive unit 20 and / or the on-board charger 50 can be used for redundant control to ensure the control effect of the air conditioning motor 10 (that is, the air conditioning motor 10 will not be unable to be driven due to a failure of the motor drive unit 20). Furthermore, the entire air conditioning motor drive system integrated with the onboard charger can also achieve maximum power output when the air conditioning motor 10 is in a state of maximum power output. The controller 40 controls the first switch unit 30 to connect the air conditioning motor 10 to the AC output terminal VL, thereby jointly driving the air conditioning motor 10 based on the bridge arm of the motor drive unit 20 and the onboard charger 50 to achieve maximum power output. The maximum power output refers to the maximum power that the entire air conditioning motor 10 can output, which is expressed as the cooling or heating efficiency of the air conditioner. When achieving maximum power output, the onboard charger 50 is in a charging stop state (i.e., the onboard charger 50 is not used to charge the electric vehicle because the charging bridge arm of the power factor correction circuit 51 is in use during charging and cannot control the air conditioning motor 10). At this time, the power demand of the air conditioning motor 10 (the actual output power required by the air conditioning motor 10) is greater than the maximum output power provided by the motor drive unit 20 (i.e., the power demand is the maximum power output because the maximum power that the air conditioning motor 10 can provide under the control of the motor drive unit 20 is a fixed value. If the output power is to be further increased, the number of turns of the winding in the air conditioning motor 10 needs to be increased). At this time, the driving bridge arms in the two driving units can drive the air-conditioning motor 10 at the same time to achieve the purpose of maximizing the output power of the air-conditioning motor 10. That is, at this time, there is no need to increase the number of turns of the winding in the air-conditioning motor 10 to achieve a higher power output, thereby reducing the use cost of the air-conditioning motor 10 and ensuring the redundancy of the control of the air-conditioning motor 10. Among them, the principle of increasing the output power is that the motor driving unit 20 of the air-conditioning motor 10 provides voltage to the power supply 60. times (i.e. each phase winding of the air-conditioning motor 10 is allocated to the power supply 60) times), and the output power of the air-conditioning motor 10 is positively correlated with the voltage distributed to each phase. Therefore, the bridge arm in the on-board charger 50 is used to control the air-conditioning motor 10 at the same time, so that each phase winding of the air-conditioning motor 10 can be distributed to the power supply 60, thereby increasing the output power of the air-conditioning motor 10 without increasing the number of turns of the winding.

[0066] It is worth noting that the power supply 60 can be a combination of a DC power supply Udc and a capacitor C. The DC power supply Udc and the capacitor C are provided at the positive and negative terminals of the motor drive unit 20 to power the motor drive unit 20. The DC power supply Udc can be a high-voltage DC power supply. Of course, the power supply 60 can also be used to simultaneously power the positive and negative terminals of the power factor correction circuit 51 in the on-board charger 50, thereby reducing the cost of using the power supply 60. In addition, to achieve backup of the power supply 60, two sets of power supplies 60 can be used to power the power factor correction circuit 51 and the motor drive unit 20. A first switch D1, a second switch D2, and further switches can be used to enable and disable power to the power factor correction circuit 51 and the motor drive unit 20, thereby ensuring redundancy of the power supply 60. The controller 40 can be a normal controller, such as a PWM (Pulse Width Modulation) controller that controls the switch tube in the inverter circuit. Of course, it can also be a simple single-chip microcomputer. The controller 40 can also control different switches in the first switch unit 30, such as by outputting high and low levels to the switches in the first switch unit 30, thereby controlling the conduction and disconnection of the switches. It can also control the first switch D1 and the second switch D2 that conduct the power supply 60 to achieve the supply of the power supply 60. That is, all devices that need to be controlled in the entire air-conditioning motor drive system integrated with the on-board charger can be integrated into the controller 40 for control, so as to reduce the cost of the entire air-conditioning motor drive system integrated with the on-board charger and improve the integration of the air-conditioning motor drive system integrated with the on-board charger.

[0067] Furthermore, in another embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present application, the air-conditioning motor 10 is a three-phase motor 10, including three motor windings (i.e., a first motor winding L1, a second motor winding L2, and a third motor winding L3), the motor drive unit 20 includes three-phase drive bridge arms corresponding to the three motor windings (i.e., a first drive bridge arm 21, a second drive bridge arm 22, and a third drive bridge arm 23), and the on-board charger 50 includes three-phase AC output terminals (i.e., a first AC output terminal VL1, a second AC output terminal VL2, and a third AC output terminal VL3);

[0068] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switch unit 30;

[0069] The controller is specifically used to: when it is monitored that the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit 30 to be turned on, so as to utilize the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 to jointly drive the three-phase motor 10.

[0070] In this embodiment, the three motor windings in the three-phase motor 10 are connected to the three-phase AC output end through the first switch unit 30. When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state and the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, by turning on each switch in the first switch unit 30 to connect the three-phase AC output end to the corresponding motor winding, the bridge arms of the on-board charger 50 and the motor drive unit 20 can be used simultaneously to jointly drive the three-phase motor 10 to increase the voltage of each motor winding, thereby increasing the output power of the three-phase motor 10.

[0071] In one embodiment, referring to Figure 2 , Figure 2This is a circuit connection diagram of a motor drive unit in an air-conditioning motor drive system integrated with an on-board charger of the present invention. The air-conditioning motor 10 includes a first motor winding L1, a second motor winding L2, and a third motor winding L3. The three-phase air-conditioning bridge arm includes a first drive bridge arm 21, a second drive bridge arm 22, and a third drive bridge arm 23. The first drive bridge arm 21 includes a first MOS transistor Q1 and a second MOS transistor Q2. The drain of the first MOS transistor Q1 is the first end of the first drive bridge arm 21. The gate of the first MOS transistor Q1 is connected to the controller 40. The source of the first MOS transistor Q1 and the drain of the second MOS transistor Q2 are connected together to form the midpoint of the first drive bridge arm 21 and are connected to the first end of the first motor winding L1. The source of the second MOS transistor Q2 is the second end of the first drive bridge arm 21. The gate of the second MOS transistor Q2 is connected to the controller 40. The second drive bridge arm 22 includes a third MOS transistor Q3 and a fourth MOS transistor Q4. The third MOS transistor Q4 is connected to the controller 40. The drain of Q3 is the first end of the second drive bridge arm 22. The gate of the third MOS transistor Q3 is connected to the controller 40. The source of the third MOS transistor Q3 and the drain of the fourth MOS transistor Q4 are connected together to form the midpoint of the second drive bridge arm 22 and are connected to the first end of the second motor winding L2. The source of the fourth MOS transistor Q4 is the second end of the second drive bridge arm 22, and the gate of the fourth MOS transistor Q4 is connected to the controller 40. The third drive bridge arm 23 includes a fifth MOS transistor Q5 and a sixth MOS transistor Q6. The drain of the fifth MOS transistor Q5 is the first end of the third drive bridge arm 23, and the gate of the fifth MOS transistor Q5 is connected to the controller 40. The source of the fifth MOS transistor Q5 and the drain of the sixth MOS transistor Q6 are connected together to form the midpoint of the third drive bridge arm 23 and are connected to the first end of the third motor winding L3. The source of the sixth MOS transistor Q6 is the second end of the third drive bridge arm 23, and the gate of the sixth MOS transistor Q6 is connected to the controller 40. It is worth noting that the switching tube in the three-phase drive bridge arm can be a MOS (Metal-Oxide-Semiconductor) tube, an IGBT (Insulated Gate Bipolar Transistor) tube, and a triode, etc. The driving principle of the entire three-phase air-conditioning bridge arm is the same as that of the bridge arm of the existing inverter (which can be a half-bridge or full-bridge) circuit, and is not repeated here.

[0072] In one embodiment, referring to Figure 3 , Figure 3This is a schematic diagram of a framework of an on-board charger for an electric vehicle according to the present invention. The power factor correction circuit 51 in the on-board charger 50 is provided with a three-phase charging bridge arm. The driving principle of the entire three-phase charging bridge arm is the same as that of the bridge arm (which can be a half-bridge or full-bridge) circuit of an existing inverter and the three-phase air conditioning bridge arm described above, and no further explanation is given here. In this case, the three bridge arm midpoints of the three-phase charging bridge arm serve as three AC output terminals VL, and one AC output terminal VL is connected to a switch in the first switch unit 30. Of course, a single-phase charging bridge arm can also be provided in the on-board charger 50, and further connected to a switch in the first switch unit 30, so as to replace a certain bridge arm in the motor drive unit 20 (i.e., a certain bridge arm is disconnected from the motor winding through a control switch, and the single-phase charging bridge arm is connected to the motor winding through the first switch unit 30) to ensure the driving effect of the air conditioning motor 10. It is worth noting that the onboard charger 50 may include PFC (Power Factor Correction), a core module for improving power conversion efficiency and optimizing charging performance. It may also include an LLC (two-inductor, one-capacitor combination) resonant converter 52 or a DAB (Dual Active Bridge), and may include a first AC input terminal VG1, a second AC input terminal VG2, and a third AC input terminal VG3 connected to the AC power supply, as well as connections to external AC ports controlled by corresponding switches. The control and operating principles of the onboard charger 50 and the power factor correction circuit 51 are not described in detail here. The entire air conditioning motor drive system integrated with the onboard charger achieves increased output power and control redundancy by reusing the existing power factor correction circuit 51 in the electric vehicle. This can reduce the implementation cost of the entire air conditioning motor drive system integrated with the onboard charger and increase the reuse rate of the power factor correction circuit 51.

[0073] It is worth noting that the control ends of the three-phase charging bridge arm and other control components in the on-board charger 50 can be connected to the controller 40, thereby reducing the use of the controller 40. At the same time, the power supply 60 can be shared with the air-conditioning motor drive system integrated with the on-board charger to reduce the cost of the power supply 60 of the entire electric vehicle.

[0074] Furthermore, in another embodiment of the air-conditioning motor drive system integrated with the vehicle charger of the present application, referring to Figure 4 , Figure 4 This is a circuit connection diagram of the first embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present invention. The first switch unit 30 includes a first single-pole double-throw switch S1, a second single-pole double-throw switch S2, and a first single-pole single-throw switch K1;

[0075] A movable contact of the first single-pole double-throw switch S1 is connected to a second end of a first motor winding L1 among the motor windings, a first fixed contact of the first single-pole double-throw switch S1 is connected to a first-phase AC output terminal VL1 among the three-phase AC output terminals, a second fixed contact of the first single-pole double-throw switch S1 is connected to a second end of a second motor winding L2 among the motor windings, and a control terminal of the first single-pole double-throw switch S1 is connected to a controller 40;

[0076] A movable contact of a second single-pole double-throw switch S2 is connected to a second end of a third motor winding L3 among the motor windings, a first fixed contact of the second single-pole double-throw switch S2 is connected to a third-phase AC output terminal VL3 among the three-phase AC output terminals, a second fixed contact of the second single-pole double-throw switch S2 is connected to a second end of the second motor winding L2, and a control terminal of the second single-pole double-throw switch S2 is connected to the controller 40;

[0077] The first end of the first SPST switch K1 is connected to the second end of the second motor winding L2, the second end of the first SPST switch K1 is connected to the second phase AC output terminal VL2 of the three-phase AC output terminal, and the control end of the first SPST switch K1 is connected to the controller 40.

[0078] In this embodiment, the first switch unit 30 includes a first single-pole double-throw switch S1, a second single-pole double-throw switch S2 and a first single-pole single-throw switch K1, wherein the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 can be selectively connected to two positions. Taking the connection relationship of the first single-pole double-throw switch S1 as an example, the first single-pole double-throw switch S1 can connect the second end of the first motor winding L1 and the first AC output end VL1, and can also connect the second end of the first motor winding L1 and the second end of the second motor winding L2, thereby being able to control and realize different connection modes. The single-pole double-throw switch can be a relay, a digital selection switch, a switch tube, etc. The difference between a single-pole double-throw switch and a single-pole single-throw switch is that there is a selectable endpoint. For example, the single-pole double-throw switch can be equivalent to a two-choice selector commonly used in digital circuits, and the single-pole single-throw switch is equivalent to a push button switch.

[0079] In one embodiment, based on the design of the first switch unit 30, reference may be made to Figure 5 , Figure 5This is a first control diagram of the first embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present invention, that is, when the power factor correction circuit 51 in the on-board charger 50 is charging or does not need maximum power output, the connection with the winding in the air-conditioning motor 10 is disconnected to avoid the influence of the bridge arm charging in the power factor correction circuit 51 on the air-conditioning motor 10. That is, when the bridge arm in the on-board charger 50 is not needed, the controller 40 controls the movable contact of the first single-pole double-throw switch S1 to establish a connection with the second fixed contact of the first single-pole double-throw switch S1, the movable contact of the second single-pole double-throw switch S2 to establish a connection with the second fixed contact of the second single-pole double-throw switch S2, and the first end of the first single-pole single-throw switch K1 is disconnected from the second end of the first single-pole single-throw switch K1. For further information, please refer to Figure 6 , Figure 6 This is a second control diagram of the first embodiment of the air-conditioning motor drive system integrated with an on-board charger according to the present invention. When a higher output power is required (i.e., the power demand is maximum output), a connection is established with the windings of the air-conditioning motor 10 to increase the output power of the air-conditioning motor 10. Specifically, when the bridge arm of the on-board charger 50 is required, the controller 40 controls the movable contact of the first single-pole double-throw switch S1 to connect with the first fixed contact of the first single-pole double-throw switch S1, the movable contact of the second single-pole double-throw switch S2 to connect with the first fixed contact of the second single-pole double-throw switch S2, and the first end of the first single-pole single-throw switch K1 to connect with the second end of the first single-pole single-throw switch K1. In other words, by jointly driving both bridge arms, the voltage distributed to the motor windings is increased, thereby improving the output power of the air-conditioning motor 10. This control method allows the air-conditioning motor to be miniaturized (without increasing the number of winding turns) while maintaining the same output power requirement, thereby reducing the implementation cost of the entire air-conditioning motor drive system integrated with the on-board charger (particularly the air-conditioning motor 10).

[0080] Furthermore, in another embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present application, the air-conditioning motor 10 includes three motor windings, and the motor drive unit 20 includes a three-phase drive bridge arm corresponding one-to-one to the three motor windings (one-to-one correspondence means that one motor winding corresponds to one drive bridge arm, and the same corresponding relationship will be applied later). The air-conditioning motor drive system integrated with the on-board charger also includes a second switch unit 70;

[0081] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via the second switch unit 70, and the second ends of the three motor windings are connected to the three-phase AC output end of the on-board charger 50 via the first switch unit 30;

[0082] The controller 40 is also used to: when a fault is detected in the motor drive unit, by controlling the on / off state of each switch in the first switch unit and the second switch unit, use the bridge arm of the on-board charger to replace the faulty bridge arm in the motor drive unit to drive the air-conditioning motor.

[0083] In this embodiment, the air conditioning motor drive system integrated with the onboard charger also includes a second switch unit 70. This second switch unit 70 is designed between the first end of the motor winding and the output end of each phase drive bridge arm to control the disconnection of the output end of each phase drive bridge arm from the air conditioning motor. If the motor drive unit fails, the switches in the first switch unit 30 can be turned on, while the switches in the second switch unit 70 can be turned off, allowing the bridge arm of the onboard charger 50 to drive the air conditioning motor 10 alone. If the motor drive unit is functioning normally and its power meets the air conditioning motor's power requirements, the switches in the second switch unit 70 can be turned on, while the switches in the first switch unit 30 can be turned off, allowing the motor drive unit 20 to drive the air conditioning motor 10 alone. This solution expands the selectivity of the air conditioning motor 10. In this case, either the bridge arm of the onboard charger 50 or the bridge arm of the motor drive unit 20 can be selected for driving based on power requirements, or the faulty bridge arm can be completely replaced if a bridge arm fails. It is worth noting that at this time, the switches in the first switch unit 30 and the second switch unit 70 can still be controlled to be turned on at the same time, so as to utilize the bridge arm of the vehicle charger 50 and the bridge arm of the motor drive unit 20 to jointly drive the air-conditioning motor 10, thereby increasing the output power of the air-conditioning motor 10 without increasing the number of winding turns of the air-conditioning motor 10.

[0084] Furthermore, in another embodiment of the air-conditioning motor drive system integrated with the vehicle charger of the present application, referring to Figure 7 , Figure 7 This is a circuit connection diagram of a second embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention. The second switch unit 70 includes a third single-pole double-throw switch S3, a fourth single-pole double-throw switch S4, and a second single-pole single-throw switch K2;

[0085] A movable contact of a third single-pole double-throw switch S3 is connected to a first end of a first motor winding L1 among the motor windings, a first fixed contact of the third single-pole double-throw switch S3 is connected to a midpoint of a first drive bridge arm 21 among the three-phase drive bridge arms, a second fixed contact of the third single-pole double-throw switch S3 is connected to a first end of a second motor winding L2 among the motor windings, and a control end of the third single-pole double-throw switch S3 is connected to a controller 40;

[0086] A movable contact of a fourth single-pole double-throw switch S4 is connected to a first end of a third motor winding L3 in the motor windings, a first fixed contact of the fourth single-pole double-throw switch S4 is connected to a midpoint of the third drive bridge arm 23 in the three-phase drive bridge arm, a second fixed contact of the fourth single-pole double-throw switch S4 is connected to a first end of the second motor winding L2, and a control end of the fourth single-pole double-throw switch S4 is connected to the controller 40;

[0087] The first end of the second single-pole single-throw switch K2 is connected to the first end of the second motor winding L2, the second end of the second single-pole single-throw switch K2 is connected to the midpoint of the second drive bridge arm 22 in the three-phase drive bridge arm, and the control end of the second single-pole single-throw switch K2 is connected to the controller 40.

[0088] In this embodiment, the second switch unit 70 includes a third single-pole double-throw switch S3, a fourth single-pole double-throw switch S4 and a second single-pole single-throw switch K2, which can select the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 for driving. Figure 8 , Figure 8 This is a first control schematic diagram of a second embodiment of the air-conditioning motor drive system integrated with an on-board charger according to the present invention. Assuming that maximum power output is not required and the bridge arm of the motor drive unit 20 is faulty, the bridge arm of the on-board charger 50 is used alone to drive the air-conditioning motor 10. At this time, the controller controls the first fixed contact of the third single-pole double-throw switch S3 to establish a connection with the second fixed contact of the third single-pole double-throw switch S3, the first fixed contact of the fourth single-pole double-throw switch S4 to establish a connection with the second fixed contact of the fourth single-pole double-throw switch S4, and the first end of the second single-pole single-throw switch K2 to disconnect from the second end of the second single-pole single-throw switch K2. Simultaneously, the movable contact of the first single-pole double-throw switch S1 in the first switch unit 30 is connected to the first fixed contact of the first single-pole double-throw switch S1, the movable contact of the second single-pole double-throw switch S2 is connected to the first fixed contact of the second single-pole double-throw switch S2, and the first end of the first single-pole single-throw switch K1 is connected to the second end of the first single-pole single-throw switch K1, thereby achieving the goal of using the bridge arm of the on-board charger 50 alone to drive the air-conditioning motor 10. In another embodiment, referring to Figure 9 , Figure 9This is a second control schematic diagram of the second embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present invention. When maximum power output is required, the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 are used simultaneously for driving. At this time, the controller controls the first fixed contact of the third single-pole double-throw switch S3 to establish a connection with the first fixed contact of the third single-pole double-throw switch S3, the first fixed contact of the fourth single-pole double-throw switch S4 to establish a connection with the first fixed contact of the fourth single-pole double-throw switch S4, and the first end of the second single-pole single-throw switch K2 to establish a connection with the first fixed contact of the fourth single-pole double-throw switch S4. The second ends of the two single-pole single-throw switches K2 are connected, and at the same time, the movable contact of the first single-pole double-throw switch S1 in the first switch unit 30 is connected to the first fixed contact of the first single-pole double-throw switch S1, the movable contact of the second single-pole double-throw switch S2 is connected to the first fixed contact of the second single-pole double-throw switch S2, and the first end of the first single-pole single-throw switch K1 is connected to the second end of the first single-pole single-throw switch K1, so as to realize the simultaneous use of the bridge arm of the vehicle charger 50 and the bridge arm of the motor drive unit 20 for driving, thereby increasing the output power of the air-conditioning motor 10.

[0089] Furthermore, in another embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present application, the air-conditioning motor 10 is a six-phase motor 10, including six motor windings, the second ends of the three motor windings are connected together to form two three-phase windings, the motor drive unit 20 includes a three-phase drive bridge arm corresponding one-to-one to the three motor windings in one three-phase winding, and the on-board charger 50 includes a three-phase AC output terminal corresponding one-to-one to the three motor windings in another three-phase winding;

[0090] The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected to the three-phase AC output end via the first switch unit 30;

[0091] The controller 40 is specifically used to: when it is monitored that the power demand of the air-conditioning motor 10 is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit 30 to be turned on, so as to utilize the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 to jointly drive the six-phase motor 10.

[0092] In this embodiment, when the air-conditioning motor 10 is a six-phase motor 10, the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 can be selected to drive the three motor windings. At this time, the bridge arm of the on-board charger 50 can be selected to drive the corresponding motor winding alone, or the bridge arm of the motor drive unit 20 can be selected to drive the corresponding motor winding alone, or the bridge arm of the on-board charger 50 can be used to drive the corresponding motor winding and the bridge arm of the motor drive unit 20 can be used to drive the corresponding motor winding. At this time, the selectivity of the air-conditioning motor 10 drive can be guaranteed. At the same time, the six-phase motor 10 can be jointly driven based on the use of the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 to ensure that the six-phase motor 10 has a larger power output while using fewer motor drive units 20, thereby reducing the cost of driving the air-conditioning motor 10.

[0093] In one embodiment, referring to Figure 10 , Figure 10 This is a circuit connection diagram of the third embodiment of the air-conditioning motor drive system integrated with an on-board charger of the present invention. The first switch unit 30 includes three third single-pole single-throw switches (i.e., third single-pole single-throw switches K3-K5). The first ends of the three third single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three third single-pole single-throw switches are respectively connected to the three-phase AC output ends in a one-to-one correspondence.

[0094] In this embodiment, compared with the three-phase motor 10 (the three-phase motor 10 only includes a three-phase winding formed by the first motor winding L1, the second motor winding L2, and the third motor winding L3), the six-phase motor 10 also includes another three-phase winding formed by the fourth motor winding L4, the fifth motor winding L5, and the sixth motor winding L6. Among them, the three-phase winding formed by the first motor winding L1, the second motor winding L2, and the third motor winding L3 is directly driven and controlled by the first drive bridge arm 21, the second drive bridge arm 22, and the third drive bridge arm 23 in the motor drive unit 20, while the other three-phase winding formed by the fourth motor winding L4, the fifth motor winding L5, and the sixth motor winding L6 is connected to the three-phase AC output terminal through the first switch unit 30. Please refer to Figure 11 , Figure 11This is a circuit control diagram of the third embodiment of the air-conditioning motor drive system integrated with the on-board charger of the present invention. When maximum power output is required, the first switch unit 30 can be controlled to connect the first end of the fourth motor winding L4, the first end of the fifth motor winding L5, and the first end of the sixth motor winding L6 to the three-phase AC output end of the power factor correction circuit 51 (that is, the third single-pole single-throw switch is controlled to be turned on), and then the fourth motor winding L4, the fifth motor winding L5, and the sixth motor winding L6 are driven based on the charging bridge arm on the power factor correction circuit 51. At the same time, the first drive bridge arm 21, the second drive bridge arm 22, and the third drive bridge arm 23 in the motor drive unit 20 drive and control the first motor winding L1, the second motor winding L2, and the third motor winding L3, so as to achieve the purpose of increasing the output power of the air-conditioning motor 10. It is worth noting here that if six-phase control is required, two three-phase air-conditioning bridge arms need to be used for control, while the present application only uses one three-phase air-conditioning bridge arm, and then shares the charging bridge arm in the power factor correction circuit 51 to achieve it, thereby reducing the cost of the entire air-conditioning motor drive system integrated with the on-board charger.

[0095] Based on the above embodiment of the air-conditioning motor driving system integrated with the on-board charger, the first embodiment of the air-conditioning motor driving method integrated with the on-board charger of the present application is proposed. Figure 12 , Figure 12 This is a flow chart of a method for driving an air conditioner motor integrated with an on-board charger according to the present invention. The steps of the method for driving an air conditioner motor integrated with an on-board charger include:

[0096] Step S10, when the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state, controls the on / off state of each switch in the first switch unit according to the power demand of the air-conditioning motor, specifically including:

[0097] When the power demand is greater than the maximum output power of the motor drive unit, all switches in the first switch unit are controlled to be in an on state, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the air conditioner motor;

[0098] When the power demand is less than or equal to the maximum output power of the motor drive unit, all switches in the first switch unit are controlled to be in an off state.

[0099] In this embodiment, based on the design of the air conditioner motor drive system integrated with an onboard charger in the above-described embodiment, when the air conditioner motor drive system is in a non-charging state (i.e., when the bridge arm of the onboard charger is idle), the bridge arm of the onboard charger is activated. The on / off state of each switch in the first switch unit is controlled based on the power demand of the air conditioner motor. When the power demand exceeds the maximum output power of the motor drive unit, the bridge arm of the onboard charger and the bridge arm of the motor drive unit are used to jointly drive the air conditioner motor. The power demand of the air conditioner motor refers to the power demand generated by the user or the air conditioner itself, and the maximum power output is a user-defined maximum output power value. When the power demand exceeds the maximum output power of the motor drive unit, the bridge arm of the onboard charger and the bridge arm of the motor drive unit are used to jointly drive the air conditioner motor to achieve maximum power output. This avoids the problem of increasing the output power of the air conditioner motor by simply increasing the number of turns in the motor winding. This increases the output power of the air conditioner motor without changing the windings in the motor.

[0100] In one embodiment, when controlling the switches in the first switch unit, when the power demand is greater than the maximum output power of the motor drive unit, all switches in the first switch unit are directly controlled to be in the on-state. This allows the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the air conditioner motor, achieving maximum power output. Conversely, when the power demand is equal to or greater than the maximum output power of the motor drive unit, all switches in the first switch unit are controlled to be in the off-state (this state disconnects the motor windings from the bridge arm of the on-board charger). It is worth noting that in this case, the normal power output can be defined as A and the maximum power output as B (B>A). As long as the power demand is A+1, the power demand is determined to be the maximum power output, and all switches in the first switch unit are controlled to be in the on-state. This increases the output power of the air conditioner motor by increasing the voltage across the windings without changing the windings within the air conditioner motor.

[0101] In one embodiment, the air conditioner motor driving method integrated with the on-board charger further includes:

[0102] Step S20 , when the air-conditioning motor drive system integrated with the on-board charger is in a charging state, control all switches in the first switch unit to be in an off state.

[0103] In this embodiment, the entire control process also includes: when the air-conditioning motor drive system integrated with the on-board charger is in a charging condition, that is, the bridge arm of the on-board charger is in a charging control working state, the bridge arm of the on-board charger cannot be called at this time, and in order to avoid the influence of the bridge arm of the on-board charger on the air-conditioning motor, each switch in the first switch unit will be controlled to be in an off state to disconnect the connection between the air-conditioning motor and the bridge arm of the on-board charger.

[0104] The present application also provides an electric vehicle, the electric vehicle comprising the above-mentioned air-conditioning motor drive system integrated with an on-board charger;

[0105] The controller in the air-conditioning motor driving system integrated with the on-board charger is used to execute the air-conditioning motor driving method integrated with the on-board charger as described above.

[0106] It is worth noting that, because the electric vehicle includes the above-mentioned air-conditioning motor drive system integrated with the on-board charger, and the controller in the air-conditioning motor drive system integrated with the on-board charger is used to execute the air-conditioning motor drive method integrated with the on-board charger as described above, it can be connected to the air-conditioning motor 10 through the output end of the motor drive unit 20; the AC output end VL of the on-board charger 50 is connected to the air-conditioning motor 10 via the first switch unit 30, so that when the air-conditioning motor drive system integrated with the on-board charger is in a non-charging condition, the controller controls the on / off state of each switch in the first switch unit 30, so as to utilize the bridge arm of the on-board charger 50 and the bridge arm of the motor drive unit 20 to jointly drive the air-conditioning motor 10 to achieve maximum power output (the principle is that when the motor drive unit 20 is driven, each winding in the air-conditioning motor 10 is divided into times the supply voltage, and when the bridge arms in the motor drive unit 20 and the on-board charger 50 are driven simultaneously, each winding in the air-conditioning motor 10 receives 1 times the supply voltage. Because the output power of the air-conditioning motor 10 is positively correlated with the voltage received by each winding, the purpose of increasing the output power of the air-conditioning motor 10 is achieved). This avoids the problem of only being able to increase the number of turns of the winding in the air-conditioning motor 10 to increase the output power of the air-conditioning motor 10. The output power of the air-conditioning motor 10 is increased without changing the winding in the air-conditioning motor 10.

[0107] It is worth noting that electric vehicles can also include other hardware, which are not described one by one here. The entire air-conditioning motor drive system integrated with the on-board charger can be set on the electric vehicle or on other products (such as other vehicles or smart devices with chargers and air-conditioning functions), which is not limited here.

[0108] The electric vehicle provided in this application solves the technical problem of increasing the output power of an air conditioner motor without changing the windings within the motor. Compared to the prior art, the electric vehicle provided in this application offers the same beneficial effects as the air conditioner motor drive system integrated with an onboard charger provided in the aforementioned embodiment, and will not be further elaborated here.

[0109] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An air-conditioning motor drive system integrated with an on-board charger, characterized in that: The air conditioning motor drive system integrated with the on-board charger includes: Motor drive unit, first switch unit, air-conditioning motor and on-board charger, controller; The output end of the motor drive unit is connected to the air-conditioning motor; The AC output end of the on-board charger is connected to the air-conditioning motor via the first switch unit; The controller is connected to the control terminal of the first switch unit and is used to: When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging condition, the on / off state of each switch in the first switch unit is controlled according to the power demand of the air-conditioning motor, so that when the power demand is greater than the maximum output power of the motor drive unit, the bridge arm of the on-board charger and the bridge arm of the motor drive unit are used to jointly drive the air-conditioning motor.

2. The air conditioner motor drive system integrated with the on-board charger as claimed in claim 1, characterized in that: The air-conditioning motor is a three-phase motor including three motor windings, the motor drive unit includes three-phase drive bridge arms corresponding one to one to the three motor windings, and the on-board charger includes a three-phase AC output terminal; The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switching unit; The controller is specifically used to: when it is monitored that the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit to be turned on, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the three-phase motor.

3. The air conditioner motor drive system integrated with the on-board charger according to claim 2, characterized in that: The first switch unit includes a first single-pole double-throw switch, a second single-pole double-throw switch and a first single-pole single-throw switch; The movable contact of the first single-pole double-throw switch is connected to the second end of the first motor winding among the motor windings, the first fixed contact of the first single-pole double-throw switch is connected to the first phase AC output end among the three-phase AC output ends, the second fixed contact of the first single-pole double-throw switch is connected to the second end of the second motor winding among the motor windings, and the control end of the first single-pole double-throw switch is connected to the controller; The movable contact of the second single-pole double-throw switch is connected to the second end of the third motor winding among the motor windings, the first fixed contact of the second single-pole double-throw switch is connected to the third phase AC output terminal among the three-phase AC output terminals, the second fixed contact of the second single-pole double-throw switch is connected to the second end of the second motor winding, and the control terminal of the second single-pole double-throw switch is connected to the controller; The first end of the first single-pole single-throw switch is connected to the second end of the second motor winding, the second end of the first single-pole single-throw switch is connected to the second phase AC output end of the three-phase AC output end, and the control end of the first single-pole single-throw switch is connected to the controller.

4. The air conditioner motor drive system integrated with the on-board charger as claimed in claim 3, characterized in that: The air conditioning motor drive system integrated with the on-board charger further includes a second switch unit; The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via the second switch unit, and the second ends of the three motor windings are connected to the three-phase AC output end of the on-board charger via the first switch unit; The controller is also used to: when a fault is detected in the motor drive unit, by controlling the on / off state of each switch in the first switch unit and the second switch unit, use the bridge arm of the on-board charger to replace the faulty bridge arm in the motor drive unit to drive the air-conditioning motor.

5. The air conditioner motor drive system integrated with the on-board charger according to claim 4, characterized in that: The second switch unit includes a third single-pole double-throw switch, a fourth single-pole double-throw switch and a second single-pole single-throw switch; The movable contact of the third single-pole double-throw switch is connected to the first end of the first motor winding among the motor windings, the first fixed contact of the third single-pole double-throw switch is connected to the midpoint of the bridge arm of the first drive bridge arm among the three-phase drive bridge arms, the second fixed contact of the third single-pole double-throw switch is connected to the first end of the second motor winding among the motor windings, and the control end of the third single-pole double-throw switch is connected to the controller; The movable contact of the fourth single-pole double-throw switch is connected to the first end of the third motor winding among the motor windings, the first fixed contact of the fourth single-pole double-throw switch is connected to the midpoint of the bridge arm of the third drive bridge arm among the three-phase drive bridge arms, the second fixed contact of the fourth single-pole double-throw switch is connected to the first end of the second motor winding, and the control end of the fourth single-pole double-throw switch is connected to the controller; The first end of the second single-pole single-throw switch is connected to the first end of the second motor winding, the second end of the second single-pole single-throw switch is connected to the midpoint of the second drive bridge arm in the three-phase drive bridge arm, and the control end of the second single-pole single-throw switch is connected to the controller.

6. The air conditioner motor drive system integrated with the on-board charger according to claim 1, characterized in that: The air conditioner motor is a six-phase motor, including six motor windings, the second ends of the three motor windings are connected together to form two three-phase windings, the motor drive unit includes a three-phase drive bridge arm corresponding one-to-one to the three motor windings in one three-phase winding, and the on-board charger includes a three-phase AC output terminal corresponding one-to-one to the three motor windings in another three-phase winding; The output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected to the three-phase AC output end via the first switching unit; The controller is specifically used to: when it is monitored that the power demand of the air-conditioning motor is greater than the maximum output power of the motor drive unit, control each switch in the first switch unit to be turned on, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the six-phase motor.

7. The air conditioner motor drive system integrated with the on-board charger according to claim 6, characterized in that: The first switch unit includes three third single-pole single-throw switches, the first ends of the three third single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three third single-pole single-throw switches are respectively connected to the three-phase AC output ends one by one.

8. A method for driving an air conditioner motor integrated with an on-board charger, characterized in that: The air-conditioning motor driving method integrated with the on-board charger is applied to the air-conditioning motor driving system integrated with the on-board charger according to any one of claims 1 to 7, and the air-conditioning motor driving method integrated with the on-board charger includes: When the air-conditioning motor drive system integrated with the on-board charger is in a non-charging state, the on / off state of each switch in the first switch unit is controlled according to the power demand of the air-conditioning motor, specifically including: When the power demand is greater than the maximum output power of the motor drive unit, each switch in the first switch unit is controlled to be in an on state, so as to utilize the bridge arm of the on-board charger and the bridge arm of the motor drive unit to jointly drive the air conditioner motor; When the power demand is less than or equal to the maximum output power of the motor drive unit, each switch in the first switch unit is controlled to be in an off state.

9. The air conditioner motor driving method integrated with a vehicle charger according to claim 8, characterized in that: The air conditioner motor driving method integrated with the on-board charger further includes: When the air-conditioning motor drive system integrated with the on-board charger is in a charging state, each switch in the first switch unit is controlled to be in an off state.

10. An electric vehicle, characterized in that: The electric vehicle includes the air-conditioning motor drive system integrated with an on-board charger as described in any one of claims 1 to 7.

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