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 vehicle, the motor driving system comprises a first motor driving unit, a first switch unit, a first motor, the vehicle-mounted charger and a controller; the output end of the first motor driving unit is connected with the first motor; the alternating current output end of the vehicle-mounted charger is connected with the first motor through the first switch unit; and the controller is connected with the control end of the first switch unit and is used for controlling the on / off state of each switch in the first switch unit when a motor driving instruction is received and the vehicle-mounted charger is in a non-charging working condition, so that the bridge arm of the vehicle-mounted charger and the bridge arm of the first motor driving unit are used for jointly driving the first motor. According to the invention, the functionality of motor control is 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 steering motor through its own motor drive unit. This motor control circuit has a major defect and can only be driven and controlled by its own motor drive unit. That is, this motor control circuit can only be driven and controlled by its own motor drive unit, resulting in low motor control functionality.

[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 an electric vehicle integrated with an on-board charger, aiming to solve the technical problem of low functionality of motor control.

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

[0007] A first motor drive unit, a first switch unit, a first motor, an on-board charger, and a controller;

[0008] The output end of the first motor driving unit is connected to the first motor;

[0009] The AC output end of the on-board charger is connected to the first 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 a 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 first switch unit is controlled to utilize the bridge arm of the on-board charger and the bridge arm of the first motor drive unit to jointly drive the first motor.

[0012] In one embodiment, the first 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 first 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;

[0013] 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.

[0014] In one embodiment, the first switch unit includes three first single-pole single-throw switches, the first ends of the three first single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three first single-pole single-throw switches are respectively connected to the three-phase AC output ends in a one-to-one correspondence.

[0015] In one embodiment, the motor drive system integrated with the on-board charger further includes a second switch unit, the second switch unit including three second single-pole single-throw switches, the first ends of the three second single-pole single-throw switches respectively connected to the output end of a phase drive bridge arm, and the second ends of the three second single-pole single-throw switches respectively connected to the first ends of the corresponding motor windings.

[0016] In one embodiment, the motor drive system integrated with the on-board charger includes:

[0017] a second motor drive unit, a second motor, and a power supply unit;

[0018] The output end of the second motor driving unit is connected to the second motor;

[0019] The power supply unit is connected to the positive and negative poles of the first motor drive unit and the positive and negative poles of the second motor drive unit.

[0020] In one embodiment, the second motor is a six-phase motor including six motor windings, wherein the second ends of the three motor windings are connected together to form two three-phase windings, the second 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 motor drive system integrated with the on-board charger includes a third motor drive unit and a third switch unit, wherein the third motor drive unit includes a three-phase drive bridge arm corresponding one-to-one to the three motor windings in another three-phase winding;

[0021] The output end of each phase driving bridge arm in the second motor driving unit is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected one-to-one to the output end of each phase driving bridge arm in the third motor driving unit through the third switching unit.

[0022] In one embodiment, the third 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 one-to-one to the output ends of each phase drive bridge arm in the third motor drive unit.

[0023] In one embodiment, the motor drive system integrated with the on-board charger further includes a fourth switch unit, wherein the fourth switch unit includes three fourth single-pole single-throw switches, wherein the first ends of the three fourth single-pole single-throw switches are respectively connected to the output end of a phase drive bridge arm in the second motor drive unit, and the second ends of the three fourth single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings.

[0024] In one embodiment, the power supply unit includes:

[0025] a first power supply, a second power supply, a fourth switch, and a fifth switch;

[0026] The positive and negative electrodes of the first power supply are connected to the positive and negative electrodes of the first motor drive unit, the positive and negative electrodes of the second motor drive unit, and the positive and negative electrodes of the third motor drive unit;

[0027] The positive pole of the second power supply is connected to the positive pole of the first motor drive unit, the positive pole of the second motor drive unit and the positive pole of the third motor drive unit through the fourth switch, and the negative pole of the second power supply is connected to the negative pole of the first motor drive unit, the negative pole of the second motor drive unit and the negative pole of the third motor drive unit through the fifth switch.

[0028] In one embodiment, the first motor includes an air-conditioning motor or a steering motor, and the second motor includes a drive motor.

[0029] In addition, to achieve the above-mentioned purpose, an electric vehicle is also provided, which includes the above-mentioned motor drive system integrated with the on-board charger.

[0030] The present application provides a motor drive system integrated with an on-board charger, the system comprising a first motor drive unit, a first switch unit, a first motor, an on-board charger, and a controller; the output end of the first motor drive unit is connected to the first motor; the AC output end of the on-board charger is connected to the first motor via the first switch unit; the controller is connected to the control end of the first switch unit and is used to: when a motor drive instruction is received and the on-board charger is in a non-charging condition, control the on / off state of each switch in the first switch unit to utilize the bridge arm of the on-board charger and the bridge arm of the first motor drive unit to jointly drive the first motor. The first motor is connected to the vehicle through the output end of the first motor drive unit; the AC output end of the vehicle charger is connected to the first motor via the first switch unit. When a motor drive instruction is received and the vehicle charger is in a non-charging condition, the on / off state of each switch in the first switch unit can be controlled to utilize the bridge arm of the vehicle charger and the bridge arm of the first motor drive unit to jointly drive the first motor, thereby avoiding the problem that the steering motor can only be driven and controlled by its own motor drive unit. This motor drive system integrated with the vehicle charger can use the bridge arm in the vehicle charger to perform redundant control of the first motor, thereby improving the functionality of the motor control. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the motor drive system integrated with the on-board charger of the present invention;

[0032] Figure 2 This is a schematic diagram of the module connection of the motor drive system integrated with the on-board charger of the present invention;

[0033] Figure 3 This is a connection diagram of a first embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0034] Figure 4 This is a control schematic diagram of a first embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0035] Figure 5 This is a control connection diagram of a second embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0036] Figure 6 A connection diagram of a third embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0037] Figure 7 This is a control connection diagram of a third embodiment of the motor drive system integrated with an on-board charger of the present invention;

[0038] Figure 8 This is a control schematic diagram of a fourth embodiment of a motor drive system integrated with an on-board charger according to the present invention;

[0039] Figure 9 FIG. 1 is a connection diagram of a fifth embodiment of a motor drive system integrated with an on-board charger according to the present invention.

[0040] 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.

[0041] Description of Figure Numbers:

[0042] 50. On-board charger; 51. Power factor correction circuit; 10. First motor; 20. First motor drive unit; 40. First switch unit; 30. Controller; 60. Power supply unit; VL, AC output terminal; Udc1, first DC power supply; C1, first capacitor; Udc2, second DC power supply; C2, second 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; L5, fifth motor winding; L6, third motor winding group; 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;

[0043] D5, fifth switch; K1-K3, first single-pole single-throw switch; K4-K6, second single-pole single-throw switch; 52, resonant converter; VG1, first AC input terminal; VG2, second AC input terminal; VG3, third AC input terminal; 80, second motor; Q7, seventh MOS transistor; Q8, eighth MOS transistor; Q9, ninth MOS transistor; Q10, tenth MOS transistor; Q11, eleventh MOS transistor; Q12, twelfth MOS transistor; Q13, thirteenth MOS transistor; Q14, fourteenth MOS transistor; Q15, fifteenth MOS transistor OS tube; Q16, the sixteenth MOS tube; Q17, the seventeenth MOS tube; Q18, the eighteenth MOS tube; L7, the seventh motor winding; L8, the eighth motor winding; L9, the ninth motor winding; L10, the tenth motor winding; L11, the eleventh motor winding; L12, the twelfth motor winding; 70, the second switch unit; C0, the second motor drive unit; 90, the third motor drive unit; A0, the third switch unit; B0, the fourth switch unit; Y1-Y3, the third single-pole single-throw switch; Y4-Y6, the fourth single-pole single-throw switch. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The motor control circuit controls the motor through its own motor drive unit, which results in the motor being driven and controlled solely by its own motor drive unit. If a motor is equipped with a corresponding motor drive unit, the motor's corresponding functions will be unavailable if that motor drive unit fails. Therefore, to address these issues, the present invention proposes a motor drive system integrated with an onboard charger.

[0050] The present invention provides a first embodiment of a motor drive system integrated with a vehicle charger, referring to Figure 1The schematic diagram of the structure of the motor drive system integrated with the on-board charger includes:

[0051] A first motor drive unit 20, a first switch unit 40, a first motor 10, an onboard charger 50, and a controller 30;

[0052] The output end of the first motor drive unit 20 is connected to the first motor 10;

[0053] The AC output terminal VL of the on-board charger 50 is connected to the first motor 10 via the first switch unit 40;

[0054] The controller 30 is connected to the control terminal of the first switch unit 40 and is used to:

[0055] When a motor drive instruction is received and the on-board charger 50 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 on-board charger 50 and the bridge arm of the first motor drive unit 20 to jointly drive the first motor 10.

[0056] In this embodiment, the output terminal of the first motor drive unit 20 is connected to the first motor 10; the AC output terminal VL of the on-board charger 50 is connected to the first motor 10 via the first switch unit 40. When a motor drive command is received (a motor drive command is a command to drive the motor, which can be a command to increase the motor output power or a direct definition of the need to use the on-board charger 50 for driving), and the on-board charger is in a non-charging state, the first motor 10 can be driven based on the charging bridge arm of the power factor correction circuit 51 in the on-board charger 50, thereby eliminating the need for the first motor 10 to use its own motor drive unit, thereby expanding the functionality of the motor control. It is worth noting that the first motor 10 can be a steering motor. In this case, the first motor drive unit 20 can be used to drive the steering motor. That is, when the first motor 10 is a steering motor, the corresponding drive unit of the first motor 10 can be omitted. Moreover, the principle of directly using the charging bridge arm in the power factor correction circuit 51 to drive the first motor 10 is that: 1. The driving requirements of the steering motor itself (such as the output power required) are roughly the same as the charging bridge arm in the power factor correction circuit 51, and thus can be effectively replaced; 2. The charging bridge arm in the power factor correction circuit 51 will not steer when charging, and will not charge when steering, thus perfectly avoiding charging conflicts, and the charging bridge arm in the power factor correction circuit 51 can be completely used to replace its own motor drive unit, and then at least its own motor drive unit and the charging bridge arm in the power factor correction circuit 51 can be used to drive the steering motor to expand the functionality of the motor control. At the same time, other motors can be jointly controlled by reusing the bridge arm of the on-board charger 50 and its own bridge arm, thereby increasing the output power of the motor to adapt to different high-power usage scenarios.

[0057] It is worth noting that the controller 30 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. In addition, the controller 30 can also control different switches in the motor control module 110, such as by outputting high and low levels to the switch in the conductive switch unit to control the conduction and disconnection of the switch. It can also control other different switches to achieve line connection and disconnection (such as the first switch D1 and the second switch D2 in the subsequent power supply unit 40). That is, all devices that need to be controlled by the entire motor drive system integrated with the on-board charger can be integrated into the drive controller 30 for control, thereby reducing the cost of the entire motor drive system integrated with the on-board charger and improving the integration of the motor drive system integrated with the on-board charger.

[0058] Furthermore, in another embodiment of the motor drive system integrated with the vehicle charger of the present application, referring to Figure 2 , Figure 2 This is a schematic diagram of the module connection of the motor drive system integrated with an on-board charger of the present invention. The first motor 10 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 first motor drive unit 20 includes three-phase drive bridge arms (first drive bridge arm 21, first drive bridge arm 22, and first drive bridge arm 23) corresponding one-to-one to the three motor windings in one three-phase winding. The on-board charger 50 includes three-phase AC output terminals corresponding one-to-one to the three motor windings in another three-phase winding.

[0059] 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 40 .

[0060] Further, refer to Figure 3 , Figure 3 This is a connection diagram of the first embodiment of the motor drive system integrated with an on-board charger of the present invention. The first switch unit 40 includes three first single-pole single-throw switches (switches K1-K3). The first ends of the three first single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three first single-pole single-throw switches are respectively connected to the three-phase AC output ends in a one-to-one correspondence.

[0061] In this embodiment, the first motor 10 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. At this time, the output end of each phase driving bridge arm is connected to the first end of the corresponding motor winding. The first ends of the three motor windings are connected to the three-phase AC output end through the first switch unit 40. When the on-board charger 50 is in a non-charging state, the bridge arm of the on-board charger 50 can be used to drive the first motor 10. Because the first switch unit 40 includes three first single-pole single-throw switches, you can refer to Figure 4 , Figure 4 This is a control schematic diagram of the first embodiment of the motor drive system integrated with an on-board charger of the present invention. By outputting a high level to the three first single-pole single-throw switches to turn on the three first single-pole single-throw switches, the bridge arm of the on-board charger 50 is connected to the three motor windings in another three-phase winding. This will achieve driving the three motor windings in another three-phase winding based on the bridge arm of the on-board charger 50, thereby expanding the functionality of the motor control.

[0062] In one embodiment, the motor drive unit is composed of three bridge arms. Take the first motor drive unit as an example. The first motor drive unit 20 includes a first drive bridge arm 21, a second drive bridge arm 22 and a third drive bridge arm 52. Each drive bridge arm is composed of two switch tubes. The connection method of each drive bridge arm can be Figure 2 The connection of the three-phase drive bridge arm (i.e. forming a three-phase bridge arm circuit) is carried out. The switch tube can be a MOS (Metal-Oxide-Semiconductor) tube, an IGBT (Insulated Gate Bipolar Transistor) tube, a triode, etc. The driving principle of the entire three-phase drive 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. At this time, by designing three single-pole single-throw switches (i.e. Figure 3 The first single-pole single-throw switch K1, the second single-pole single-throw switch K2 and the third single-pole single-throw switch K3 in the six-phase motor are connected to three of the motor windings (i.e. Figure 3 Between the first end of each motor winding (the fourth motor winding L4, the fifth motor winding L5 and the third motor winding L6) and an AC output terminal VL, the charging bridge arm drives the first motor 10 based on the first single-pole single-throw switch K1, the second single-pole single-throw switch K2 and the third single-pole single-throw switch K3, so as to improve the output power of the first motor 10 (directly affecting the driving effect), so as to increase the output power of the first motor 10 without increasing the number of turns of the winding (increasing the volume and cost of the first motor 10).

[0063] Furthermore, in another embodiment of the motor drive system integrated with the vehicle charger of the present application, referring to Figure 5 , Figure 5 This is a control connection diagram of the second embodiment of the motor drive system integrated with the on-board charger of the present invention. The motor drive system integrated with the on-board charger also includes a second switch unit 70. The second switch unit 70 includes three second single-pole single-throw switches (i.e., K4-K6). The first ends of the three second single-pole single-throw switches are respectively connected to the output end of a phase drive bridge arm, and the second ends of the three second single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings.

[0064] In this embodiment, the motor drive system integrated with the on-board charger also includes a second switch unit 70, which includes three second single-pole single-throw switches. The second switch unit 70 can be used to control whether to connect to the first motor drive unit 20 based on the three second single-pole single-throw switches. When a fault occurs in the first motor drive unit 20, the second single-pole single-throw switch can be directly disconnected and the first single-pole single-throw switch can be connected. This can prevent the faulty first motor drive unit 20 from affecting the drive of the first motor 10. At the same time, the use scenario of the bridge arm in the on-board charger 50 is expanded, thereby ensuring the safety of vehicle driving.

[0065] Furthermore, in another embodiment of the motor drive system integrated with the on-board charger of the present application, when the steering motor is a three-phase motor, the motor drive system integrated with the on-board charger includes:

[0066] A second motor drive unit C0, a second motor 80 and a power supply unit 60;

[0067] The output end of the second motor drive unit C0 is connected to the second motor 60;

[0068] The power supply unit 60 is connected to the positive and negative electrodes of the first motor drive unit 20 and the positive and negative electrodes of the second motor drive unit C0 .

[0069] In this embodiment, the motor drive system integrated with the on-board charger also includes a second motor drive unit C0, a second motor 80 and a power supply unit 60. At this time, the positive and negative poles of the first motor drive unit 20 and the positive and negative poles of the second motor drive unit C0 can share a power supply unit. The power supply unit can be a first power supply and / or a second power supply. By sharing the power supply, the cost of power supply can be reduced. At the same time, the first motor 10 can be redundantly driven based on the bridge arm in the on-board charger 50, thereby achieving motor drive functionality.

[0070] Furthermore, in another embodiment of the motor drive system integrated with the vehicle charger of the present application, referring to Figure 6 , Figure 6 This is a connection diagram of a third embodiment of a motor drive system integrated with an on-board charger according to the present invention. The second motor 80 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 second motor drive unit C0 includes three-phase drive bridge arms corresponding one-to-one to the three motor windings in one three-phase winding. The motor drive system integrated with the on-board charger includes a third motor drive unit 90 and a third switch unit A0. The third motor drive unit 90 includes three-phase drive bridge arms corresponding one-to-one to the three motor windings in another three-phase winding.

[0071] The output end of each phase driving bridge arm in the second motor driving unit C0 is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected one-to-one with the output end of each phase driving bridge arm in the third motor driving unit 90 through the third switching unit A0.

[0072] Furthermore, the third switch unit A0 includes three third single-pole single-throw switches (i.e., J1-J3), 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 one-to-one to the output ends of each phase drive bridge arm in the third motor drive unit 90.

[0073] In this embodiment, the second motor 80 is a six-phase motor, including six motor windings, and the second ends of the three motor windings are connected together to form two three-phase windings. At this time, 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 one-to-one with the output end of each phase driving bridge arm in the third motor drive unit 90 through the third switch unit A0. When high power output is required or the six motor windings of the six-phase motor work at the same time, each phase driving bridge arm in the third motor drive unit 90 and each phase driving bridge arm in the second motor drive unit C0 can be selected to drive the second motor 80, so as to achieve this through the common drive of the driving bridge arms on both sides, thereby increasing the output power. Because the motor winding can only be divided into two phases when driven on one side, the output power can be increased by the common drive of the driving bridge arms on both sides. The output power of the steering motor is positively correlated with the voltage received by each winding, thereby increasing the output power of the second motor. It is worth noting that the components of each phase drive bridge arm in the third motor drive unit 90 and each phase drive bridge arm in the second motor drive unit C0 are identical to those of the first motor drive unit 20 in the above-described embodiment and will not be repeated here.

[0074] In one embodiment, the power supply unit 40 in the motor drive system integrated with the onboard charger is connected to the positive and negative terminals of each motor drive unit and the positive and negative terminals of the power factor correction circuit 51. The controller 30 in the motor drive system integrated with the onboard charger can also be connected to the control terminals of each motor drive unit to reduce the use of the controller 30. The power factor correction circuit 51 in the onboard charger 50 is configured as a three-phase charging bridge arm. The driving principle of the entire three-phase charging bridge arm is similar to that of the bridge arm of an existing inverter (which can be a half-bridge or full-bridge circuit) and the same three-phase drive bridge arm described above, and no further description is required here. In this case, the midpoints of the three bridge arms of the three-phase charging bridge arm serve as three AC output terminals VL, one of which is connected to a switch in the first motor drive unit 20. Of course, the on-board charger 50 can also be provided with a single-phase charging bridge arm (i.e., the common point of the two switches in the charging bridge arm forms the bridge arm midpoint and serves as an AC output terminal VL. Of course, only the first AC output terminal VL1 of the three-phase charging bridge arm can also be used), which is then connected to the three switches in the first motor drive unit 20. The AC output terminal VL is connected to the windings of the first motor 10 to drive the first motor 10. It is worth noting that the on-board charger 50 can include PFC (Power Factor Correction), a core module for improving power conversion efficiency and optimizing charging performance. It can also include an LLC (two-inductor-one-capacitor combination) resonant converter 52 or a DAB (Dual Active Bridge). It can also 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 a connection to an external AC port through corresponding switch control. The control and operating principles of the on-board charger 50 and the power factor correction circuit 51 are not described in detail here. The entire motor drive system integrated with the on-board charger increases output power and control redundancy by reusing the power factor correction circuit 51 already on the electric vehicle itself, thereby reducing the implementation cost of the entire motor drive system integrated with the on-board charger and improving the reuse rate of the power factor correction circuit 51.

[0075] 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 30, thereby reducing the use of the controller 30. At the same time, the power supply unit 40 can be shared with the motor drive system integrated with the on-board charger to reduce the cost of the power supply unit 40 of the entire electric vehicle.

[0076] 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 also includes a fourth switch unit B0, and the fourth switch unit B0 includes three fourth single-pole single-throw switches (i.e., switches J4-J6), and the first ends of the three fourth single-pole single-throw switches are respectively connected to the output end of a phase drive bridge arm in the second motor drive unit C0, and the second ends of the three fourth single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings.

[0077] In this embodiment, the motor drive system integrated with the on-board charger also includes a fourth switch unit B0, which includes three fourth single-pole single-throw switches. The fourth switch unit B0 can be used to control whether to connect to the second motor drive unit C0 based on the three fourth single-pole single-throw switches. When a fault occurs in the second motor drive unit C0, the fourth single-pole single-throw switch can be directly disconnected and the third single-pole single-throw switch can be connected. This can avoid the faulty second motor drive unit C0 from affecting the drive of the second motor 80, thereby ensuring the safety of vehicle driving.

[0078] In one embodiment, the switches described in the above embodiments can be other switching devices, such as switching transistors, transistors, selectors, etc. Furthermore, the bridge arms in the onboard charger 50 can be directly connected between the output terminals of each motor drive unit and the motor windings (via a switch per phase), with the output terminals of each motor drive unit connected to a switch. This can then be controlled to disconnect the switches at the output terminals of each motor drive unit, controlling the switch connections between the bridge arms in the onboard charger 50 and the motor windings to replace the faulty bridge arms in each motor drive unit, thereby ensuring accurate motor control. It is worth noting that the first motor 10 can be a three-phase motor. In this case, either one end of the three motor windings of the three-phase motor is connected in common, while the other ends are connected to the bridge arms in the onboard charger 50 and the bridge arms in the motor drive units via different switches to achieve the above replacement control; or, alternatively, the bridge arms in the onboard charger 50 and the bridge arms in the motor drive units are connected to the ends of the motor windings via different switches to achieve full replacement or shared drive operation, or to enable the operation of a single bridge arm, thereby ensuring motor drive functionality.

[0079] In one embodiment, the power supply unit includes:

[0080] a first power supply, a second power supply, a fourth switch, and a fifth switch;

[0081] The positive and negative electrodes of the first power supply are connected to the positive and negative electrodes of the first motor drive unit, the positive and negative electrodes of the second motor drive unit, and the positive and negative electrodes of the third motor drive unit;

[0082] The positive pole of the second power supply is connected to the positive pole of the first motor drive unit, the positive pole of the second motor drive unit and the positive pole of the third motor drive unit through the fourth switch, and the negative pole of the second power supply is connected to the negative pole of the first motor drive unit, the negative pole of the second motor drive unit and the negative pole of the third motor drive unit through the fifth switch.

[0083] In one embodiment, the first motor includes an air-conditioning motor or a steering motor, and the second motor includes a drive motor.

[0084] In this embodiment, the first motor comprises an air conditioning motor or a steering motor, and the second motor comprises a drive motor. This allows the two motors to be integrated into a power supply unit 60, thereby reducing the cost of the power supply unit 60. It is worth noting that the first motor can also serve as the drive motor, but in this case the onboard charger 50 can only temporarily drive the drive motor because the output power of the onboard charger 50 cannot meet the normal power output of the drive motor. Therefore, the onboard charger 50 is generally not used to completely replace the bridge arm of the drive motor. Furthermore, the first motor 10 and the second motor 80 can share a single power supply (i.e., the drive motor and the steering motor are simultaneously provided on the front and rear axles of the vehicle to achieve a shared power supply). The power supply 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 terminals of the motor drive unit 30 to power each motor drive unit. The first DC power supply Udc1 can be a high-voltage DC power supply. Of course, the same power supply can also be used to power the positive and negative terminals of the power factor correction circuit 51, thereby reducing the cost of the power supply. The controller 30 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 30 can control the various switches in the first switch unit 20, such as by outputting high and low voltage levels to the switches in the switch unit, thereby controlling the on and off states of the switches. Alternatively, a combination of a second DC power supply Udc2 and a second capacitor C2 can be used to provide a redundant power supply backup, i.e., controlling the fourth switch D4 and the fifth switch D5 of the power supply to provide a redundant power supply backup. It is worth noting that all components required to be controlled by the entire motor drive system integrated with the onboard charger can be integrated into the controller 30 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.

[0085] The present application also provides an electric vehicle, which includes the above-mentioned motor drive system integrated with an on-board charger.

[0086] 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 first motor drive unit 20 is connected to the first motor 10; the AC output end VL of the on-board charger 60 is connected to the first motor 10 via the first switch unit 40; the controller 50 is connected to the control end of the first switch unit 20, and is used to: when a motor drive instruction is received and the on-board charger is in a non-charging condition, control the on / off state of each switch in the first switch unit 20, so as to utilize the bridge arm of the on-board charger 60 and the bridge arm of the first motor drive unit 20 to jointly drive the first motor 10. By controlling the on / off state of each switch in the first switch unit 20 when the system is in a non-charging state, the bridge arm of the on-board charger 60 and the bridge arm of the first motor drive unit 20 can jointly drive the first motor 10, thereby avoiding the problem that the steering motor can only be driven and controlled by its own motor drive unit. This motor drive system integrated with the on-board charger can use the bridge arm of the on-board charger 50 to redundantly control the first motor 10, thereby improving the motor control effect.

[0087] 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 electric vehicle or on other products (such as other vehicles or smart devices with chargers and steering functions), which are not limited here.

[0088] The electric vehicle provided by this application can solve the technical problem of low functionality of motor control. Compared with the prior art, the beneficial effects of the electric vehicle provided by 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.

[0089] 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: The motor drive system integrated with the on-board charger includes: A first motor drive unit, a first switch unit, a first motor, an on-board charger, and a controller; The output end of the first motor driving unit is connected to the first motor; The AC output terminal of the on-board charger is connected to the first 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 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 first switch unit is controlled to utilize the bridge arm of the on-board charger and the bridge arm of the first motor drive unit to jointly drive the first motor.

2. The motor drive system integrated with the on-board charger according to claim 1, characterized in that: The first 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 first 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 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.

3. The motor drive system integrated with the on-board charger according to claim 2, characterized in that: The first switch unit includes three first single-pole single-throw switches, the first ends of the three first single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings, and the second ends of the three first single-pole single-throw switches are respectively connected to the three-phase AC output ends in a one-to-one correspondence.

4. 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 also includes a second switch unit, which includes three second single-pole single-throw switches, wherein the first ends of the three second single-pole single-throw switches are respectively connected to the output end of a phase drive bridge arm, and the second ends of the three second single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings.

5. The motor drive system integrated with the on-board charger according to claim 1, characterized in that: The motor drive system integrated with the on-board charger includes: a second motor drive unit, a second motor, and a power supply unit; The output end of the second motor driving unit is connected to the second motor; The power supply unit is connected to the positive and negative poles of the first motor drive unit and the positive and negative poles of the second motor drive unit.

6. The motor drive system integrated with the on-board charger according to claim 5, characterized in that: The second motor is a six-phase motor including six motor windings, wherein the second ends of the three motor windings are connected together to form two three-phase windings, the second 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 motor drive system integrated with the on-board charger includes a third motor drive unit and a third switch unit, wherein the third motor drive unit includes a three-phase drive bridge arm corresponding one-to-one to the three motor windings in another three-phase winding; The output end of each phase driving bridge arm in the second motor driving unit is connected to the first end of the corresponding motor winding, and the first ends of the three motor windings are connected one-to-one to the output end of each phase driving bridge arm in the third motor driving unit through the third switching unit.

7. The motor drive system integrated with the on-board charger according to claim 6, characterized in that: The third switching 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 one-to-one to the output ends of each phase drive bridge arm in the third motor drive unit.

8. The motor drive system integrated with the on-board charger according to claim 6, characterized in that: The motor drive system integrated with the on-board charger also includes a fourth switch unit, which includes three fourth single-pole single-throw switches, wherein the first ends of the three fourth single-pole single-throw switches are respectively connected to the output end of a phase drive bridge arm in the second motor drive unit, and the second ends of the three fourth single-pole single-throw switches are respectively connected to the first ends of the corresponding motor windings.

9. The motor drive system integrated with the on-board charger according to claim 6, characterized in that: The power supply unit includes: a first power supply, a second power supply, a fourth switch, and a fifth switch; The positive and negative electrodes of the first power supply are connected to the positive and negative electrodes of the first motor drive unit, the positive and negative electrodes of the second motor drive unit, and the positive and negative electrodes of the third motor drive unit; The positive pole of the second power supply is connected to the positive pole of the first motor drive unit, the positive pole of the second motor drive unit and the positive pole of the third motor drive unit through the fourth switch, and the negative pole of the second power supply is connected to the negative pole of the first motor drive unit, the negative pole of the second motor drive unit and the negative pole of the third motor drive unit through the fifth switch.

10. The motor drive system integrated with an on-board charger according to any one of claims 5 to 9, characterized in that: The first motor includes an air-conditioning motor or a steering motor, and the second motor includes a drive motor.

11. An electric vehicle, characterized in that: The invention comprises a motor drive system integrated with an on-board charger as claimed in any one of claims 1 to 10.

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