Motor driving system integrated with vehicle-mounted charger and electric vehicle

Abstract

The invention relates to the technical field of motor control, and discloses a motor driving system integrated with a vehicle-mounted charger and an electric automobile, the system comprises the vehicle-mounted charger, a first switch unit and a motor which are electrically connected in sequence, and a controller connected with the first switch unit, a bridge arm in the vehicle-mounted charger can be reused as a motor driving bridge arm, so that the product cost can be reduced; or, when the vehicle-mounted charger is in a non-charging working condition, the on / off state of each switch in the first switch unit can be controlled according to the working state of the motor driving unit, so that the on / off state of each switch in the first switch unit can be controlled when the bridge arm in the motor driving unit is abnormal. The abnormal bridge arm is replaced by the bridge arm of the vehicle-mounted charger or the motor driving unit is replaced to drive the motor, so that the reliability of the motor driving system is further improved.

Description

Technical Field

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

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

[0003] The traditional motor control circuit drives and controls the motor through its own motor drive unit. This motor control circuit has a major defect. When the motor drive unit fails (generally due to failure of the internal power semiconductor), the motor cannot be driven and controlled. That is, this motor control circuit can only use the motor drive unit to drive the motor, which results in low reliability of motor control.

[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 provide a motor drive system and a vehicle integrated with an on-board charger, aiming to solve the technical problem of low reliability of motor control.

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

[0007] Motor, first switch unit, on-board charger, and controller;

[0008] The AC output end of the on-board charger is connected to the motor via the first switch unit;

[0009] The controller is connected to the control terminal of the first switch unit and is used to:

[0010] When a first motor driving instruction is received and the on-board charger is in a non-charging state, the on / off state of each switch in the first switch unit is controlled to drive the motor using the bridge arm of the on-board charger.

[0011] In another aspect, the present application provides a motor drive system integrated with an on-board charger, comprising a motor, a first switch unit, an on-board charger, and a controller; an AC output terminal of the on-board charger is connected to the motor via the first switch unit; the motor drive system integrated with the on-board charger further comprises:

[0012] a motor drive unit and a second switch unit;

[0013] The output end of the motor drive unit is connected to the motor via the second switch unit;

[0014] The controller is further connected to the control terminal of the second switch unit, and is used to:

[0015] When a second motor drive instruction is received and the on-board charger is in a non-charging condition, the on / off state of each switch in the second switch unit and the first switch unit is controlled according to the working state of the motor drive unit, so that when an abnormality occurs in the bridge arm of the motor drive unit, the bridge arm of the on-board charger is used to drive the motor instead.

[0016] In one embodiment, the motor is a three-phase motor including three motor windings, and the motor drive unit includes three-phase drive bridge arms corresponding one to one to the three motor windings;

[0017] The second switch unit includes three first single-pole single-throw switches, the output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via a first single-pole single-throw switch, and the second ends of the three motor windings are connected in common;

[0018] The first switch unit includes three second single-pole single-throw switches, the first ends of the three second single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three second single-pole single-throw switches are all connected to the AC output end of the on-board charger.

[0019] In one embodiment, the on-board charger is a single-phase on-board charger, the AC output terminal is a single-phase AC output terminal, and the second terminals of the three second single-pole single-throw switches are connected to the single-phase AC output terminal after being connected in common;

[0020] The controller is specifically used to: when it is detected that a fault occurs in any phase bridge arm in the motor drive unit, disconnect the first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect the second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the single-phase AC output end.

[0021] In one embodiment, the on-board charger is a three-phase on-board charger, the AC output end includes a three-phase AC output end, and the three-phase AC output end is connected to the second ends of the three second single-pole single-throw switches in a one-to-one correspondence;

[0022] The controller is specifically configured to: when a fault is detected in a bridge arm of a certain phase in the motor drive unit, disconnect a first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect a second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the AC output end; or,

[0023] When it is detected that a phase bridge arm in the motor drive unit fails, all the first single-pole single-throw switches are disconnected and all the second single-pole single-throw switches are turned on.

[0024] In one embodiment, the motor drive unit includes a three-phase drive bridge arm, the motor includes three motor windings, and the on-board charger includes a three-phase AC output terminal;

[0025] The first ends of the three motor windings are connected to the three-phase drive bridge arm via the second switch unit, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switch unit;

[0026] The controller is specifically used for:

[0027] When a fault is detected in a certain phase bridge arm in the motor drive unit, the second switch unit is controlled to disconnect the connection between the three-phase drive bridge arm and the three motor windings, and the first switch unit is controlled to connect the connection between the three-phase AC output end and the three motor windings.

[0028] In one embodiment, the second switch unit includes a first single-pole double-throw switch, a second single-pole double-throw switch, and a third single-pole single-throw switch;

[0029] The movable contact of the first 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 first 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 first 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 first single-pole double-throw switch is connected to the controller;

[0030] The movable contact of the second 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 second 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 second single-pole double-throw switch is connected to the first end of the second motor winding, and the control end of the second single-pole double-throw switch is connected to the controller;

[0031] The first end of the third single-pole single-throw switch is connected to the first end of the second motor winding, the second end of the third single-pole single-throw switch is connected to the midpoint of the bridge arm of the second drive bridge arm in the three-phase drive bridge arm, and the control end of the third single-pole single-throw switch is connected to the controller.

[0032] In one embodiment, the first switch unit includes a third single-pole double-throw switch, a fourth single-pole double-throw switch, and a fourth single-pole single-throw switch;

[0033] The movable contact of the third 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 third 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 third 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 third single-pole double-throw switch is connected to the controller;

[0034] The movable contact of the fourth 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 fourth 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 fourth single-pole double-throw switch is connected to the second end of the second motor winding, and the control terminal of the fourth single-pole double-throw switch is connected to the controller;

[0035] The first end of the fourth single-pole single-throw switch is connected to the second end of the second motor winding, the second end of the fourth single-pole single-throw switch is connected to the second phase AC output end of the AC output end, and the control end of the fourth single-pole single-throw switch is connected to the controller.

[0036] In one embodiment, the motor drive system integrated with the on-board charger further includes a first power supply, a second power supply, a first switch, a second switch, a third switch, and a fourth switch;

[0037] The first end of the first power supply is connected to the first end of the motor drive unit via the third switch, and the second end of the first power supply is connected to the second end of the motor drive unit via the fourth switch;

[0038] The first end of the second power supply is connected to the first end of the motor drive unit via the first switch, and the second end of the second power supply is connected to the second end of the motor drive unit via the second switch. The first end of the second power supply is also connected to the first end of the vehicle charger, and the second end of the second power supply is also connected to the second end of the vehicle charger.

[0039] In addition, to achieve the above-mentioned purpose, an electric vehicle is also provided, which includes the motor drive system integrated with the on-board charger as described above.

[0040] In one embodiment, the motor in the motor drive system integrated with the on-board charger is any one of a drive motor, a steering motor, or an air-conditioning motor in an electric vehicle.

[0041] In one embodiment, the input ends of the driving motor and the steering motor are connected in parallel to the same power supply.

[0042] The present application provides a motor drive system integrated with an on-board charger. The system includes a motor, a first switch unit, an on-board charger, and a controller. The on-board charger's AC output terminal is connected to the motor via the first switch unit. The controller is connected to the control terminal of the first switch unit and is configured to, upon receiving a first motor drive command and the on-board charger being in a non-charging state, control the on / off state of each switch in the first switch unit to utilize the bridge arm of the on-board charger to drive the motor. This solution improves system integration and reduces product costs by reusing the bridge arm within the on-board charger as the motor drive bridge arm. Furthermore, when the system includes a motor drive unit independent of the on-board charger, the controller can further control the on / off state of each switch in the first switch unit based on the operating state of the motor drive unit upon receiving a second motor drive command and the on-board charger being in a non-charging state. Consequently, when a bridge arm in the motor drive unit experiences an abnormality, the bridge arm of the on-board charger can replace the abnormal bridge arm or replace the motor drive unit to drive the motor, further improving the reliability of the motor drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic structural diagram of a motor drive system integrated with an on-board charger according to the present invention;

[0044] Figure 2 This is another structural schematic diagram of the motor drive system integrated with the on-board charger of the present invention;

[0045] Figure 3 This is a circuit connection diagram of a first embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0046] Figure 4 A schematic diagram of a frame of an on-board charger in an electric vehicle of the present invention;

[0047] Figure 5 This is a first control schematic diagram of a first embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0048] Figure 6 This is a second control schematic diagram of the first embodiment of the motor drive system integrated with the on-board charger of the present invention;

[0049] Figure 7 This is a third control schematic diagram of the first embodiment of the motor drive system integrated with the on-board charger of the present invention;

[0050] Figure 8 This is a circuit connection diagram of a second embodiment of the motor drive system integrated with an on-board charger of the present invention;

[0051] Figure 9This is another schematic diagram of the framework of the on-board charger in the electric vehicle of the present invention;

[0052] Figure 10 This is a first control schematic diagram of a second embodiment of the motor drive system integrated with an on-board charger of the present invention;

[0053] Figure 11 This is a circuit connection diagram of a third embodiment of the motor drive system integrated with an on-board charger of the present invention;

[0054] Figure 12 This is a control schematic diagram of a third embodiment of the motor drive system integrated with an on-board charger of the present invention;

[0055] Figure 13 The figure is a circuit connection diagram of a motor drive unit in a motor drive system integrated with an on-board charger according to the present invention.

[0056] 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.

[0057] Description of Figure Numbers:

[0058] 60. On-board charger; 61. Power factor correction circuit; 10. Motor; 20. Second switch unit; 30. Motor drive unit; 40. First switch unit; 50. Controller; 70. (First and second) power supplies; VL, AC output terminal; Udc1, first DC power supply; C1, first capacitor; Udc2, second DC power supply; C2, second capacitor; 31, first drive bridge arm; 32, second drive bridge arm; 33, third drive bridge arm; Q1, first MOS transistor; Q2, second MOS transistor; Q3, third MOS transistor;

[0059] Q4, fourth MOS transistor; Q5, fifth MOS transistor; Q6, sixth MOS transistor; L1, first motor winding; L2, second motor winding; L3, third motor winding; VL1, first AC output terminal; VL2, second AC output terminal; VL3, third AC output terminal; D1, first switch; D2, second switch; D3, third switch; D4, fourth switch; K1-K3, first single-pole single-throw switch; K4-K6, second single-pole single-throw switch; S1, first single-pole double-throw switch; S2, second single-pole double-throw switch; K7, third single-pole single-throw switch; S3, third single-pole double-throw switch; S4, fourth single-pole double-throw switch; K8, fourth single-pole single-throw switch; 62, resonant converter; VG1, first AC input terminal; VG2, second AC input terminal; VG3, third AC input terminal; D5, fifth switch; D6, sixth switch; D7, seventh switch. DETAILED DESCRIPTION

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 specific circumstances.

[0064] 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.

[0065] The commonly used motor drive method is to control the drive motor through its own motor drive unit. However, for the drive motor, if the motor drive unit fails (usually the internal power semiconductor fails), the drive motor cannot be driven and controlled, which will be a very serious problem. The existing control method for when the drive cannot be driven or the drive is abnormal (i.e., the drive is abnormal) is generally to stop the drive directly, which will seriously affect the experience of the user. That is, when the motor drive unit cannot be driven or the drive is abnormal, the control effect of using emergency braking is not good. Therefore, based on the above problems, the motor drive system integrated with the on-board charger of the present invention is proposed.

[0066] The present invention provides a first embodiment of a motor drive system integrated with a vehicle charger, referring to Figure 1 A schematic structural diagram of a motor drive system integrated with an on-board charger, the motor drive system integrated with the on-board charger comprising:

[0067] Motor 10, first switch unit 40, on-board charger 60, controller 50;

[0068] The AC output terminal v1 of the on-board charger 60 is connected to the motor 10 via the first switch unit 40;

[0069] The controller 50 is connected to the control terminal of the first switch unit 40 and is used to:

[0070] When the first motor driving instruction is received and the vehicle-mounted charger is in a non-charging state, the on / off state of each switch in the first switch unit 40 is controlled to utilize the bridge arm of the vehicle-mounted charger 60 to drive the motor 10 .

[0071] In this embodiment, by controlling the on / off state of each switch in the first switch unit 40, the bridge arm of the onboard charger 60 can be used to drive the motor 10, thereby expanding the functionality of the motor drive control. It is worth noting that in this case, the motor drive unit of the steering motor can generally be directly replaced. Because the output power of the onboard charger 60 can meet the power requirements of the steering, but cannot normally meet the power requirements of the drive and air conditioning, the motor drive unit of the steering motor is generally directly replaced to reduce the cost of motor control and improve the functionality and reliability of motor control. The first motor drive instruction is an instruction to determine the motor and can be issued by the user.

[0072] Reference Figure 2 In another embodiment of the motor drive system integrated with the on-board charger of the present application, the motor drive system includes a motor 10, a first switch unit 40, an on-board charger 60, and a controller 50; an AC output terminal VL of the on-board charger 60 is connected to the motor 10 via the first switch unit 40, and the motor drive system integrated with the on-board charger further includes:

[0073] A motor drive unit 30 and a second switch unit 20;

[0074] The output end of the motor drive unit 30 is connected to the motor 10 via the second switch unit 20;

[0075] The controller 50 is also connected to the control terminal of the second switch unit 20 and is used to:

[0076] When the second motor drive instruction is received and the on-board charger is in a non-charging state, the on / off state of each switch in the second switch unit 20 and the first switch unit 40 is controlled according to the working state of the motor drive unit 30, so that when an abnormality occurs in the bridge arm of the motor drive unit 30, the bridge arm of the on-board charger 60 is used to replace its drive motor 10.

[0077] In this embodiment, the output terminal of the motor drive unit 30 is connected to the motor 10 via the second switch unit 20. When the second switch unit 20 is turned on, the motor drive unit 30 can be used to drive the motor 10. Simultaneously, the motor 10 is connected to the AC output terminal VL of the onboard charger 60 via the first switch unit 40. The first switch unit 40 can be controlled to connect or disconnect the motor 10 from the AC output terminal VL. This allows the motor 10 to be selectively driven by either the motor drive unit 30 or the AC output terminal VL of the onboard charger 60, thereby expanding the control functionality of the motor 10. Specifically, the motor drive unit 30 and / or the AC output terminal VL of the onboard charger 60 can be used for redundant control to ensure effective control of the motor 10 (i.e., to prevent the motor 10 from being unable to drive due to a failure of the motor drive unit 30, the AC output terminals VL of some motor drive units 30 and the onboard charger 60 can be used to jointly drive the motor 10). Furthermore, when using the motor drive unit 30 and / or the AC output terminal VL of the onboard charger 60 for drive control, the control flow may be as follows: In the first case, if the motor drive unit 30 is in a faulty state, the second switch unit 20 is controlled to disconnect the motor 10 from the output terminal of the motor drive unit 30, and the first switch unit 40 is controlled to connect the motor 10 to the AC output terminal VL, thereby driving the motor 10 via the bridge arm of the onboard charger 60. Specifically, if the motor drive unit 30 is faulty due to an internal short circuit or damage, the second switch unit 20 is controlled to disconnect the motor 10 from the output terminal of the motor drive unit 30 to prevent the faulty motor drive unit 30 from affecting the motor 10, while simultaneously connecting the motor 10 to the AC output terminal VL, thereby driving the motor 10 via the bridge arm of the onboard charger 60, thereby improving the motor control effect. It is worth noting that in this case, only the faulty bridge arm of the motor drive unit 30 can be replaced, or all of it can be directly replaced. In the second case, under normal driving conditions (the motor drive unit 30 is fault-free and can provide the required driving output power), the motor drive unit 30 can be connected to the motor 10 through the second switch unit 20, and the first switch unit 40 controls the bridge arm of the on-board charger 60 to be disconnected from the motor 10, thereby allowing the motor drive unit 30 to be used for normal driving. In the third case, when a larger drive is required (in this case, the AC output terminals VL of the motor drive unit 30 and the on-board charger 60 are respectively connected to the two ends of the motor winding), the motor drive unit 30 can be connected to the motor 10 through the second switch unit 20, and the first switch unit 40 controls the bridge arm of the on-board charger 60 to be connected to the motor 10, thereby providing the motor 10 with a larger voltage (the bridge arm of the on-board charger 60 and the motor drive unit 30 driving each winding at the same time is the voltage of the complete power supply 70) to increase the output power.Furthermore, based on the above control method, the effect of motor control can be improved and the functionality of motor control can be expanded.

[0078] Furthermore, in another embodiment of the motor drive system integrated with the on-board charger of the present application, the motor 10 is a three-phase motor, including three motor windings (i.e., a first motor winding L1, a second motor winding L2, and a third motor winding L3), and the motor drive unit 30 includes three-phase drive bridge arms (i.e., a first drive bridge arm 31, a second drive bridge arm 32, and a third drive bridge arm 33) corresponding one to one to the three motor windings;

[0079] The second switch unit 20 includes three first single-pole single-throw switches, the output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via a first single-pole single-throw switch, and the second ends of the three motor windings are connected in common;

[0080] The first switch unit 40 includes three second single-pole single-throw switches, the first ends of the three second single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three second single-pole single-throw switches are all connected to the AC output terminal VL of the vehicle charger 60.

[0081] In this embodiment, because the motor drive unit 20 includes a three-phase drive bridge arm to drive a three-phase motor, three first single-pole single-throw switches are designed in the second switch unit 20. Each first single-pole single-throw switch is connected between the bridge arm midpoint of the drive bridge arm and the corresponding motor winding, so that the bridge arm midpoint of the drive bridge arm can be used as the output terminal to drive the motor 10. Here, corresponding refers to a first single-pole single-throw switch connected between the bridge arm midpoint of a drive bridge arm and a motor winding. Because there are three bridge arm midpoints of the drive bridge arm and three motor windings, three first single-pole single-throw switches are required. In this case, each first single-pole single-throw switch is connected to the controller 50 via a control terminal. When the controller 50 outputs a low level, the two ends of the first single-pole single-throw switch are connected, and when the controller 50 outputs a high level, the two ends of the first single-pole single-throw switch are disconnected, thereby controlling the winding to be disconnected or connected with the corresponding bridge arm midpoint based on the first single-pole single-throw switch. On the other hand, three second single-pole, single-throw (SPST) switches are designed in the first switch unit 40. Each second SPST switch is connected between the AC output terminal VL of the on-board charger 60 and the corresponding motor winding. The AC output terminal VL of the on-board charger 60 can then be used as the output terminal to drive the motor 10. The term "corresponding" refers to a second SPST switch connected between the AC output terminal of the on-board charger and a motor winding. Because there are three motor windings, three second SPST switches are required. Each second SPST switch is connected to the controller 50 via a control terminal. When the controller 50 outputs a low level, the two ends of the second SPST switch are connected. When the controller 50 outputs a high level, the two ends of the second SPST switch are disconnected. This allows the second SPST switches to control the connection or disconnection of the winding from the corresponding AC output terminal. It is worth noting that the first single-pole single-throw switch and the second single-pole single-throw switch (as well as the first switch D1 and the second switch D2 mentioned above and other single-pole single-throw switches mentioned later) can be relays, digital selection switches, and switch tubes, etc., which are not limited here.

[0082] Exemplarily, the motor 10 includes a first motor winding L1, a second motor winding L2, and a third motor winding L3. In actual connection, the second end of the first motor winding L1, the second end of the second motor winding L2, and the second end of the third motor winding L3 are connected in common. At the same time, the first end of the first motor winding L1, the first end of the second motor winding L2, and the first end of the third motor winding L3 are connected to the first single-pole single-throw switch in the second switch unit 20 and the second single-pole single-throw switch in the first switch unit 40. Then, through the second switch unit 20 and the first switch unit 40, the motor windings are connected to the bridge arms of the motor drive unit 30 and / or the on-board charger 60. In this way, it can be determined in different situations to use the bridge arms of the motor drive unit 30 and / or the on-board charger 60 to drive the motor 10. Of course, in order to avoid mutual influence between the bridge arms of the motor drive unit 30 and / or the on-board charger 60, the bridge arms of the motor drive unit 30 and / or the on-board charger 60 are generally not used simultaneously for driving to ensure that the drive is not affected by the drive bridge arm and the charging bridge arm. The entire system can use the bridge arm of the on-board charger 60 to perform redundant backup for the bridge arm in the motor drive unit 30, thereby avoiding the phenomenon of stopping driving when a failure occurs in the motor drive unit 30, thereby improving the motor control effect.

[0083] Furthermore, in another embodiment of the motor drive system integrated with the vehicle charger of the present application, referring to Figure 3 , Figure 3 This is a circuit connection diagram of the first embodiment of the motor drive system integrated with an on-board charger of the present invention. The on-board charger 60 is a single-phase on-board charger, the AC output terminal VL is a single-phase AC output terminal, and the second terminals of the three second single-pole single-throw switches are connected to the single-phase AC output terminal.

[0084] The controller 50 is specifically used to: when it is detected that a fault occurs in any phase bridge arm in the motor drive unit 30, disconnect the first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect the second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the single-phase AC output end.

[0085] In this embodiment, the AC output terminal VL may be a single-phase AC output terminal, that is, the AC output terminal VL may include a first AC output terminal VL1 (only one exists or only one is used), and then the entire motor drive system integrated with the on-board charger is controlled for fault replacement based on the first AC output terminal VL1. Figure 4 , Figure 4This is a schematic diagram of a framework of an on-board charger in an electric vehicle of the present invention. When the AC output terminal VL can be a single-phase AC output terminal (that is, when the power factor correction circuit 61 is a single-phase bridge arm circuit), the power factor correction circuit 61 only includes a single-phase charging bridge arm, and the charging bridge arm is composed of two switching tubes connected in series; the first end of the charging bridge arm is connected in common to form the positive electrode of the power factor correction circuit 61, and the second end of the charging bridge arm is connected in common to form the negative electrode of the power factor correction circuit 61. The common connection point of the two switching tubes in the charging bridge arm constitutes the midpoint of the charging bridge arm, and serves as the first AC output terminal VL1, and is connected to the second ends of the three second single-pole single-throw switches. It is worth noting that the on-board charger 60 may include PFC (Power Factor Correction), which is a core module for improving power conversion efficiency and optimizing charging performance. It may also include an LLC (a combination of two inductors and one capacitor) resonant converter 62, or a DAB (Dual Active Bridge), etc. It also includes a first AC input terminal VG1 and a second AC input terminal VG2 connected to the AC power, and a connection to an external AC port through corresponding switch control. The control and operating principles of the on-board charger 60 and the power factor correction circuit 61 are not described in detail here. The entire motor drive system integrated with the on-board charger reuses the bridge arms of the power factor correction circuit 61 already on the vehicle to replace the bridge arms in the motor drive unit 30 when they fail, thereby reducing the implementation cost of the entire motor drive system integrated with the on-board charger and increasing the reuse rate of the power factor correction circuit 61.

[0086] For example, when the AC output terminal VL is a single-phase AC output terminal, three second single-pole single-throw switches are used to connect the first motor winding L1, the second motor winding L2, and the third motor winding L3 through the first AC output terminal VL1. By controlling the three second single-pole single-throw switches, the drive bridge arm originally connected to the motor winding can be replaced, allowing the bridge arm of the on-board charger 60 to continue control directly, avoiding the risk of downtime and improving the driving effect. A fault in the motor drive unit 30 can be a short circuit in one phase (only one current output terminal VL exists). Of course, for other faults, such as a burnout of a switch tube in a phase of the motor drive unit 30, a fault in the motor drive unit 30 can also be determined. A flag bit can be directly used to determine the presence of a fault in the motor drive unit 30. If the flag bit is 1, the motor drive unit 30 is determined to be faulty, otherwise it is determined that there is no fault. This can improve the redundancy and effectiveness of the air conditioning control. It is worth noting that in order to avoid the impact on the motor 10 during charging, when the power factor correction circuit 210 is charging or the motor drive unit 30 is not faulty, each second single-pole single-throw switch remains disconnected and the first single-pole single-throw switch remains closed, so that the three-phase drive bridge arm can be used normally to drive the motor 10.

[0087] In one embodiment, reference may be made to Figure 5 , Figure 5 This is the first control diagram of the first embodiment of the motor drive system integrated with the on-board charger of the present invention. When the first drive bridge arm 31 fails, the first single-pole single-throw switch K1 is used to disconnect the first motor winding L1 from the bridge arm midpoint of the first drive bridge arm 31, and the second single-pole single-throw switch K4 is used to connect the first motor winding L1 to the first AC output terminal VL1, thereby achieving the replacement of the first drive bridge arm 31. Figure 6 , Figure 6 This is the second control diagram of the first embodiment of the motor drive system integrated with the on-board charger of the present invention. When the second drive bridge arm 32 fails, the first single-pole single-throw switch K2 is used to disconnect the second motor winding L2 from the bridge arm midpoint of the second drive bridge arm 32, and the second single-pole single-throw switch K5 is used to connect the second motor winding L2 to the first AC output terminal VL1, thereby achieving the replacement of the second drive bridge arm 32. Figure 7 , Figure 7This is the third control schematic diagram of the first embodiment of the motor drive system integrated with an on-board charger according to the present invention. When a fault occurs in the third drive bridge arm 33, the first single-pole single-throw switch K3 is used to disconnect the third motor winding L3 from the bridge arm midpoint of the third drive bridge arm 33. Simultaneously, the second single-pole single-throw switch K6 is used to connect the third motor winding L3 to the first AC output terminal VL1, thereby replacing the third drive bridge arm 33. It is worth noting that during bridge arm replacement, the unfaulty drive bridge arm is connected to the corresponding coil via the first single-pole single-throw switch in the second switch unit 20, and the coil is disconnected from the first AC output terminal VL1. This allows the faulty drive bridge arm to be replaced, thereby improving the drive control effect.

[0088] In one embodiment, referring to Figure 8 , Figure 8 This is a circuit connection diagram of a second embodiment of the motor drive system integrated with an on-board charger according to the present invention. The on-board charger 60 is a three-phase on-board charger, and the AC output terminal includes a three-phase AC output terminal, which is connected to the second terminals of the three second single-pole single-throw switches in a one-to-one correspondence.

[0089] The controller 50 is specifically configured to: when a fault is detected in a bridge arm of a certain phase in the motor drive unit 30, disconnect the first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect the second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the AC output terminal; or,

[0090] When it is detected that a phase bridge arm in the motor drive unit 30 fails, all first single-pole single-throw switches are disconnected and all second single-pole single-throw switches are turned on.

[0091] In this embodiment, the AC output terminal VL may be a three-phase AC output terminal, that is, the AC output terminal VL may include a first AC output terminal VL1, a second AC output terminal VL2, and a third AC output terminal VL3, and then the faulty bridge arm of the entire motor drive system integrated with the on-board charger is replaced based on the three AC output terminals VL. Figure 9 , Figure 9This is another schematic diagram of the onboard charger in a vehicle of the present invention. When the onboard charger 60 includes a three-phase AC output terminal (when the power factor correction circuit 61 is a three-phase bridge circuit), each charging bridge arm of the power factor correction circuit 61 is composed of two series-connected switching transistors. The first end of each charging bridge arm is connected together to form the positive electrode of the power factor correction circuit 61, and the second end of each charging bridge arm is connected together to form the negative electrode of the power factor correction circuit 61. The common connection point of the two switching transistors in each charging bridge arm forms the midpoint of the charging bridge arm of that phase and serves as an AC output terminal VL, which is connected to the second end of a second single-pole single-throw switch. It is worth noting that the onboard charger 60 in this case can include a first AC input terminal VG1, a second AC input terminal VG2, and a third AC input terminal VG3 connected to AC power, as well as a connection to an external AC port through corresponding switch control. The control and operating principles of the onboard charger 60 and the power factor correction circuit 61 are not described in detail here.

[0092] For example, the first AC output terminal VL1, the second AC output terminal VL2, and the third AC output terminal VL3 are each connected to the corresponding motor winding using a second single-pole single-throw switch. For example, the first AC output terminal VL1 is connected to the first motor winding L1 using a second single-pole single-throw switch, the second AC output terminal VL2 is connected to the second motor winding L2 using a second single-pole single-throw switch, and the third AC output terminal VL3 is connected to the third motor winding L3 using a second single-pole single-throw switch. At this point, the three second single-pole single-throw switches can be controlled to replace the drive bridge arm originally connected to the motor winding (referring to the faulty bridge arm in the motor drive unit 30), allowing the bridge arm of the onboard charger 60 to be directly used or the bridge arms of the motor drive unit 30 and the onboard charger 60 to be used separately for continued control, thereby avoiding the risk of downtime and improving the driving effect. In one feasible embodiment, when a fault is detected in a bridge arm of a certain phase in the motor drive unit 30, the first single-pole single-throw switch between the faulty bridge arm and the motor winding is disconnected, and the second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the AC output terminal is turned on. That is, at this time, only one or more faulty bridge arms are replaced as in the embodiment of the single-phase on-board charger above, and the bridge arm without fault is used. In another feasible embodiment, reference can be made to Figure 10 , Figure 10 This is a first control schematic diagram of the second embodiment of the motor drive system integrated with the on-board charger of the present invention. When all three drive bridge arms are faulty, one drive bridge arm is faulty, or both drive bridge arms are faulty, three first single-pole single-throw switches are used to disconnect the three motor windings from the midpoints of the three drive bridge arms. At the same time, three second single-pole single-throw switches are used to connect the three motor windings to the three AC output terminals, thereby realizing the replacement of the three drive bridge arms and ensuring the motor drive effect.

[0093] In one embodiment, the motor drive unit 30 includes a three-phase drive bridge arm, the motor 10 includes three motor windings, and the on-board charger 60 includes a three-phase AC output terminal;

[0094] The first ends of the three motor windings are connected to the three-phase drive bridge arm via the second switch unit 20, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switch unit 40;

[0095] The controller is specifically used to:

[0096] When a fault is detected in a phase bridge arm in the motor drive unit 30, the second switch unit 20 is controlled to disconnect the connection between the three-phase drive bridge arm and the three motor windings, and the first switch unit 40 is controlled to connect the three-phase AC output end and the three motor windings.

[0097] In this embodiment, the motor drive unit 30 includes a three-phase drive bridge arm, the motor 10 includes three motor windings, and the onboard charger 60 includes a three-phase AC output terminal. Therefore, the second switch unit 20 can be connected to the three-phase drive bridge arm, and the first switch unit 40 can be connected to the three-phase AC output terminal to drive the motor 10. It is worth noting that the first switch unit 40 and the second switch unit 20 are connected to different ends of the motor windings, allowing the onboard charger 60 to replace a faulty bridge arm in the motor drive unit 30. If a bridge arm phase in the motor drive unit 30 is determined to have failed, the second switch unit 20 is directly controlled to disconnect the three-phase drive bridge arm from the three motor windings, and the first switch unit 40 is controlled to connect the three-phase AC output terminal to the three motor windings. This allows the onboard charger 60 to control the motor 10, thereby ensuring effective control of the motor 10 in the event of a motor drive unit 30 failure.

[0098] Furthermore, in another embodiment of the motor drive system integrated with the vehicle charger of the present application, referring to Figure 11 , Figure 11 This is a circuit connection diagram of a third embodiment of the motor drive system integrated with an on-board charger of the present invention. The second switch unit 20 includes a first single-pole double-throw switch S1, a second single-pole double-throw switch S2, and a third single-pole single-throw switch K7.

[0099] A movable contact of a first single-pole double-throw switch S1 is connected to a first end of a first motor winding L1 in the motor windings, a first fixed contact of the first single-pole double-throw switch S1 is connected to a midpoint of a first drive bridge arm 31 in the three-phase drive bridge arm, a second fixed contact of the first single-pole double-throw switch S1 is connected to a first end of a second motor winding L2 in the motor windings, and a control end of the first single-pole double-throw switch S1 is connected to a controller 50;

[0100] A movable contact of a second single-pole double-throw switch S2 is connected to a first end of a third motor winding L3 in the motor windings, a first fixed contact of the second single-pole double-throw switch S2 is connected to a midpoint of a third drive bridge arm 33 in the three-phase drive bridge arm, a second fixed contact of the second single-pole double-throw switch S2 is connected to a first end of the second motor winding L2, and a control end of the second single-pole double-throw switch S2 is connected to the controller 50;

[0101] The first end of the third single-pole single-throw switch K7 is connected to the first end of the second motor winding L2, the second end of the third single-pole single-throw switch K7 is connected to the midpoint of the bridge arm of the second drive bridge arm 32 in the three-phase drive bridge arm, and the control end of the third single-pole single-throw switch K7 is connected to the controller 50.

[0102] In one embodiment, the first switch unit 40 includes a third single-pole double-throw switch S3, a fourth single-pole double-throw switch S4, and a fourth single-pole single-throw switch K8;

[0103] A movable contact of a third single-pole double-throw switch S3 is connected to a second 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 first-phase AC output terminal VL1 among the three-phase AC output terminals, a second fixed contact of the third single-pole double-throw switch S3 is connected to a second end of a second motor winding L2 among the motor windings, and a control terminal of the third single-pole double-throw switch S3 is connected to the controller 50;

[0104] A movable contact of a fourth single-pole double-throw switch S4 is connected to a second end of a third motor winding L3 among the motor windings, a first fixed contact of the fourth single-pole double-throw switch S4 is connected to a third-phase AC output terminal VL3 among the three-phase AC output terminals, a second fixed contact of the fourth single-pole double-throw switch S4 is connected to a second end of the second motor winding L2, and a control terminal of the fourth single-pole double-throw switch S4 is connected to the controller 50;

[0105] A first end of the fourth SPST switch K8 is connected to the second end of the second motor winding L2, a second end of the fourth SPST switch K8 is connected to the second phase AC output terminal VL2 of the AC output terminal, and a control end of the fourth SPST switch K8 is connected to the controller.

[0106] In this embodiment, the second switch unit 20 and the first switch unit 40 are both composed of two single-pole double-throw switches and one single-pole single-throw switch, wherein the single-pole double-throw switch can also be a relay, a digital selection switch, a switch tube, etc., but the difference between the single-pole double-throw switch and the single-pole single-throw switch is that there is a selected endpoint, such as the two-choice selector commonly used in digital circuits. With regard to the design of the second switch unit 20 and the first switch unit 40, under normal operating conditions (non-charging conditions) and with the motor drive unit 30 free of faults, the third single-pole double-throw switch S3, the fourth single-pole double-throw switch S4 and the fourth single-pole single-throw switch K8 control the three motor windings to be connected to one endpoint (i.e., the third single-pole double-throw switch S3 and the fourth single-pole double-throw switch S4 are connected to one point, which is the second end of the second motor winding L2 in this embodiment, and the fourth single-pole single-throw switch K8 is disconnected) to ensure that the drive motor operates normally under the control of the three-phase drive bridge arm. At this time, the first single-pole double-throw switch S1 and the second single-pole double-throw switch S2 are normally connected to conduct each motor winding with a corresponding drive bridge arm, i.e., the motor drive unit 30 is used to drive the motor at this time. Please refer to Figure 12 , Figure 12 This is a control diagram of a third embodiment of the motor drive system integrated with an on-board charger according to the present invention. When a fault occurs in the motor drive unit 30, particularly a short circuit in one of the drive bridge arms, the motor windings are connected together via the first single-pole double-throw switch S1, the second single-pole double-throw switch S2, and the third single-pole single-throw switch K7 (i.e., the first and second single-pole double-throw switches S1 and S2 are connected to a single point, in this embodiment, the first end of the second motor winding L2, and the third single-pole single-throw switch K7 is disconnected). The motor is then controlled via the charging bridge arm of the power factor correction circuit 61 (the third single-pole double-throw switch S3, the fourth single-pole double-throw switch S4, and the fourth single-pole single-throw switch K8 are controlled to connect each motor winding to its corresponding charging bridge arm), thereby improving the reliability and safety of the motor drive. It is worth noting that the phrase "corresponding" in the above description of each motor winding and its corresponding charging bridge arm refers to a one-to-one connection between each motor winding and only one charging bridge arm. This applies to other locations as well, and the description of these locations is not repeated here. It is worth noting that when the required output power of the motor 10 (such as the power required for the theoretical driving force generated when the vehicle is driven) is greater than the value that the motor drive unit 30 can provide (a fixed maximum limit), the charging bridge arm in the power factor correction circuit 61 can be connected to the motor winding of the motor 10 at the same time, and the output power can be increased by jointly driving the charging bridge arm and the driving bridge arm on both sides. Because the single-sided drive (charging bridge arm or driving bridge arm) can only divide the motor winding into The output power of the drive motor is positively correlated with the voltage distributed to each coil, thereby increasing the output power of the drive motor. Of course, the bridge arm in the motor drive unit 30 can also be used to perform the function of the bridge arm in the onboard charger 60, thereby replacing the bridge arm in the onboard charger 60 for voltage conversion, thereby improving the functionality of the entire system.

[0107] For example, refer to Figure 13 , Figure 13 This is a circuit connection diagram of the motor drive unit in the motor drive system integrated with the on-board charger of the present invention. The motor drive unit 30 is respectively a first drive bridge arm 31, a second drive bridge arm 32 and a third drive bridge arm 33. Each drive bridge arm is composed of two switch tubes. The connection mode of each drive bridge arm can be Figure 13 The connection (i.e., forming a three-phase bridge arm circuit) is performed by the switching tube, which 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 drive bridge arm is the same as that of the bridge arm (which can be a half-bridge or full-bridge) circuit of the existing inverter, and is not repeated here. Because the motor 10 includes a first motor winding L1, a second motor winding L1, and a third motor winding L3, one side of each motor winding is connected to the midpoint of a bridge arm of a three-phase drive bridge arm to achieve the driving operation of the motor winding, and the other side or the current side of each motor winding is connected to the DC output terminal VL through the second conductive switch unit 40, that is, connected to the charging bridge arm in the power factor correction circuit 210. Under the control of the second conductive switch unit 40 (the second conductive switch unit 40 and the first conductive switch unit 20 are not simultaneously conductive, i.e., the single-way switch in the first conductive switch unit 20 is disconnected at this time), each motor winding can be disconnected from the midpoint of the three-phase drive bridge arm, but connected to the charging bridge arm of the power factor correction circuit 210, so that the charging bridge arm can simultaneously drive and control the motor winding. This improves the control effect of the motor 10 by using the charging bridge arm of the power factor correction circuit 210 when the motor drive unit 30 fails, thereby ensuring the control effect of the motor 10. It is worth noting that the control terminals of the three-phase charging bridge arm and other control components in the on-board charger 60 can all be connected to the controller 50, thereby reducing the use of the controller 50. At the same time, the power supply 70 can be shared with the motor drive system integrated with the on-board charger, thereby reducing the cost of the power supply 70 for the entire vehicle.

[0108] Furthermore, in another embodiment of the motor drive system integrated with the on-board charger of the present application, the motor drive system integrated with the on-board charger further includes a first power supply 70, a second power supply 70, a first switch D1, a second switch D2, a third switch D3 and a fourth switch D4;

[0109] A first end of the first power supply 70 is connected to a first end of the motor drive unit 30 via a third switch D3, and a second end of the first power supply 70 is connected to a second end of the motor drive unit 30 via a fourth switch D4;

[0110] The first end of the second power supply 70 is connected to the first end of the motor drive unit 30 via the first switch D1, and the second end of the power supply 70 is connected to the second end of the motor drive unit 30 via the second switch D2. The first end of the second power supply 70 is also connected to the first end of the vehicle charger 60, and the second end of the second power supply 70 is also connected to the second end of the vehicle charger 60.

[0111] In this embodiment, to achieve backup of the power supply 70, two sets of power supplies 70 can also be used (e.g., one set using a combination of a first DC power supply Udc1 and a first capacitor C1 and connected to the positive and negative terminals of the motor drive unit 30, and another set using a second DC power supply Udc2 and a second capacitor C2 to provide power on the other side) to power the power factor correction circuit 61 and the motor drive unit 30. A first switch D1, a second switch D2, a third switch D3, a fourth switch D4, and more switches can be used to power the power factor correction circuit 61 and the motor drive unit 30, thereby ensuring redundancy of the power supply 70. It is worth noting that the first end of the motor drive unit 30 is the positive terminal of the bridge arm of the motor drive unit 30, and the second end of the motor drive unit 30 is the negative terminal of the bridge arm of the motor drive unit 30. The first end of the onboard charger 60 is the positive terminal of the bridge arm of the power factor correction circuit 61 in the onboard charger 60, and the second end of the onboard charger 60 is the negative terminal of the bridge arm of the power factor correction circuit 61 in the onboard charger 60.

[0112] The present application also provides an electric vehicle, which includes the above-mentioned motor drive system integrated with an on-board charger.

[0113] It is worth noting that the electric vehicle includes the above-mentioned motor drive system integrated with the on-board charger, and the output end of the motor drive unit 30 is connected to the motor 10 via the second switch unit 20; the AC output end VL of the on-board charger 60 is connected to the motor via the first switch unit 40; the controller 50 is respectively connected to the control end of the second switch unit 20 and the control end of the first switch unit 40, and is used to: when the system is in a non-charging condition, control the on / off state of each switch in the second switch unit 20 and the first switch unit 40 according to the working state of the motor drive unit 30, so that when an abnormality occurs in the bridge arm of the motor drive unit 30, the bridge arm of the on-board charger 60 is used to replace its drive motor 10. By controlling the on / off state of each switch in the second switch unit 20 and the first switch unit 40 according to the working state of the motor drive unit 30 when the system is in a non-charging condition, it is possible to use the bridge arm of the on-board charger 60 to replace the bridge arm in the motor drive unit 30 to drive the motor 10 when an abnormality occurs, thereby avoiding the problem of being unable to continue to drive and control the motor 10 when the motor drive unit 30 fails (generally due to failure of the internal power semiconductor). This motor drive system integrated with the on-board charger can use the bridge arm of the on-board charger 60 to perform redundant control of the motor 10, thereby improving the motor control effect.

[0114] In one embodiment, the motor in the motor drive system integrated with the on-board charger is any one of a drive motor, a steering motor, or an air-conditioning motor in an electric vehicle.

[0115] In one embodiment, the input terminals of the driving motor and the steering motor are connected in parallel to the same power supply.

[0116] In this embodiment, the motor is any one of the drive motor, steering motor, or air conditioning motor in the electric vehicle. This means that any motor can be replaced in the event of a failure, ensuring motor control effectiveness and improving the reusability of the on-board charger. Furthermore, when the motor is both a drive motor and a steering motor, a common power supply can be used (i.e., the drive motor and steering motor are simultaneously provided on the front and rear axles of the vehicle to achieve a shared power supply). The power supply (power supply 70) can be a combination of a first DC power supply Udc1 and a first capacitor C1. The first DC power supply Udc1 and the first capacitor C1 are provided at the positive and negative electrodes of the motor drive unit 30 to power the motor drive unit 30. The first DC power supply Udc1 can be a high-voltage DC power supply. Of course, the power supply 70 can also be used to simultaneously power the positive and negative electrodes of the power factor correction circuit 61 to reduce the cost of the power supply 70. The controller 50 can be a standard controller, such as a PWM (Pulse Width Modulation) controller that controls the switches in the inverter circuit, or a simple single-chip microcomputer. Furthermore, the controller 50 can control the various switches in the second switch unit 20 and the first switch unit 40, for example, by outputting high and low levels to the switches in the switch units to control the on and off states of the switches. It can also control the first switch D1 and the second switch D2 that conduct the power supply 70 to ensure the supply of the power supply 70. It is worth noting that all components that require control of the entire motor drive system integrated with the onboard charger can be integrated into the controller 50 for control, thereby reducing the cost of the entire motor drive system integrated with the onboard charger and improving the integration level of the motor drive system integrated with the onboard charger.

[0117] It is worth noting that electric vehicles can also include other hardware, which are not described one by one here. The entire motor drive system integrated with the on-board charger can be set on the vehicle or on other products (such as other transportation vehicles or smart devices with chargers and drive functions), which is not limited here.

[0118] The electric vehicle provided in this application can solve the technical problem of poor motor control. Compared with the prior art, the beneficial effects of the vehicle provided in this application are the same as those of the motor drive system integrated with the on-board charger provided in the above embodiment, and will not be elaborated here.

[0119] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made 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. A motor drive system integrated with an on-board charger, characterized in that: include: Motor, first switch unit, on-board charger, and controller; The AC output end of the on-board charger is connected to the motor via the first switch unit; The controller is connected to the control terminal of the first switch unit and is used to: When a first motor driving instruction is received and the on-board charger is in a non-charging state, the on / off state of each switch in the first switch unit is controlled to drive the motor using the bridge arm of the on-board charger.

2. A motor drive system integrated with an on-board charger, characterized in that: It includes a motor, a first switch unit, an on-board charger, and a controller; the AC output end of the on-board charger is connected to the motor via the first switch unit; The motor drive system integrated with the on-board charger further includes: a motor drive unit and a second switch unit; The output end of the motor drive unit is connected to the motor via the second switch unit; The controller is further connected to the control terminal of the second switch unit, and is used to: When a second motor drive instruction is received and the on-board charger is in a non-charging condition, the on / off state of each switch in the second switch unit and the first switch unit is controlled according to the working state of the motor drive unit, so that when an abnormality occurs in the bridge arm of the motor drive unit, the bridge arm of the on-board charger is used to drive the motor instead.

3. The motor drive system integrated with the on-board charger according to claim 2, characterized in that: The motor is a three-phase motor including three motor windings, and the motor drive unit includes three-phase drive bridge arms corresponding one to one to the three motor windings; The second switch unit includes three first single-pole single-throw switches, the output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding via a first single-pole single-throw switch, and the second ends of the three motor windings are connected in common; The first switch unit includes three second single-pole single-throw switches, the first ends of the three second single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three second single-pole single-throw switches are all connected to the AC output end of the on-board charger.

4. The motor drive system integrated with the on-board charger according to claim 3, characterized in that: The on-board charger is a single-phase on-board charger, the AC output terminal is a single-phase AC output terminal, and the second terminals of the three second single-pole single-throw switches are connected to the single-phase AC output terminal after being connected in common; The controller is specifically used to: when it is detected that a fault occurs in any phase bridge arm in the motor drive unit, disconnect the first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect the second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the single-phase AC output end.

5. The motor drive system integrated with the on-board charger according to claim 3, characterized in that: The on-board charger is a three-phase on-board charger, the AC output end includes a three-phase AC output end, and the three-phase AC output end is connected to the second ends of the three second single-pole single-throw switches in a one-to-one correspondence; The controller is specifically configured to: when detecting a fault in a bridge arm of a certain phase in the motor drive unit, disconnect a first single-pole single-throw switch between the faulty bridge arm and the motor winding, and connect a second single-pole single-throw switch between the motor winding corresponding to the faulty bridge arm and the AC output end; or, When it is detected that a phase bridge arm in the motor drive unit fails, all the first single-pole single-throw switches are disconnected and all the second single-pole single-throw switches are turned on.

6. The motor drive system integrated with the on-board charger according to claim 2, characterized in that: The motor drive unit includes a three-phase drive bridge arm, the motor includes three motor windings, and the on-board charger includes a three-phase AC output terminal; The first ends of the three motor windings are connected to the three-phase drive bridge arm via the second switch unit, and the second ends of the three motor windings are connected to the three-phase AC output end via the first switch unit; The controller is specifically used for: When a fault is detected in a certain phase bridge arm in the motor drive unit, the second switch unit is controlled to disconnect the connection between the three-phase drive bridge arm and the three motor windings, and the first switch unit is controlled to connect the connection between the three-phase AC output end and the three motor windings.

7. The motor drive system integrated with the on-board charger according to claim 6, characterized in that: The second switch unit includes a first single-pole double-throw switch, a second single-pole double-throw switch and a third single-pole single-throw switch; The movable contact of the first 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 first 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 first 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 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 first 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 midpoint of the bridge arm of the third drive bridge arm among the three-phase drive bridge arms, the second fixed contact of the second single-pole double-throw switch is connected to the first end of the second motor winding, and the control end of the second single-pole double-throw switch is connected to the controller; The first end of the third single-pole single-throw switch is connected to the first end of the second motor winding, the second end of the third single-pole single-throw switch is connected to the midpoint of the bridge arm of the second drive bridge arm in the three-phase drive bridge arm, and the control end of the third single-pole single-throw switch is connected to the controller.

8. The motor drive system integrated with the on-board charger according to claim 6, characterized in that: The first switch unit includes a third single-pole double-throw switch, a fourth single-pole double-throw switch and a fourth single-pole single-throw switch; The movable contact of the third 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 third 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 third 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 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 second 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 third phase AC output terminal among the three-phase AC output terminals, the second fixed contact of the fourth single-pole double-throw switch is connected to the second end of the second motor winding, and the control terminal of the fourth single-pole double-throw switch is connected to the controller; The first end of the fourth single-pole single-throw switch is connected to the second end of the second motor winding, the second end of the fourth single-pole single-throw switch is connected to the second phase AC output end of the AC output end, and the control end of the fourth single-pole single-throw switch is connected to the controller.

9. The motor drive system integrated with the on-board charger according to claim 2, characterized in that: The motor drive system integrated with the on-board charger further includes a first power supply, a second power supply, a first switch, a second switch, a third switch, and a fourth switch; The first end of the first power supply is connected to the first end of the motor drive unit via the third switch, and the second end of the first power supply is connected to the second end of the motor drive unit via the fourth switch; The first end of the second power supply is connected to the first end of the motor drive unit via the first switch, the second end of the second power supply is connected to the second end of the motor drive unit via the second switch, the first end of the second power supply is also connected to the first end of the on-board charger, and the second end of the second power supply is also connected to the second end of the on-board charger.

10. An electric vehicle, characterized in that: The invention comprises the motor drive system integrated with the on-board charger as claimed in claim 1; or the motor drive system integrated with the on-board charger as claimed in any one of claims 2 to 9.

11. The electric vehicle according to claim 10, wherein: The motor in the motor drive system integrated with the on-board charger is any one of a drive motor, a steering motor or an air-conditioning motor in an electric vehicle.

12. The electric vehicle according to claim 11, wherein: The input ends of the driving motor and the steering motor are connected in parallel to the same power supply.

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