An electric motor drive system, a control system, and a vehicle

Abstract

This invention discloses a motor drive system, a control system, and a vehicle, relating to the field of electric vehicle technology, aiming to improve the efficiency of the motor drive system and reduce losses. The motor drive system includes: a first battery, a second battery, a switching circuit, a generator, and a drive motor; both the first and second batteries are connected to the switching circuit, which is also connected to the generator, which is connected to the drive motor; the switching circuit is used to connect at least one of the first and second batteries to the switching circuit; at least one of the first and second batteries charges the coil of the generator, and the first and second batteries, together with the generator, provide boost voltage drive to the drive motor.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to an electric motor drive system, a control system, and a vehicle. Background Technology

[0002] With the development of new energy vehicle technology, hybrid energy storage systems are widely used in them. Traditionally, the control of hybrid energy storage systems uses a large number of high-power power electronic DC-DC converters, which results in a large system size, heavy weight, complex control, and high production cost. Moreover, the system efficiency is also limited by the loss of magnetic components.

[0003] Meanwhile, new energy vehicles have developed multi-motor drive systems such as dual-motor and tri-motor systems. Under different operating conditions, each motor has a different working state, and some motors are in standby mode, resulting in a low overall system utilization rate. Summary of the Invention

[0004] The purpose of this invention is to provide a motor drive system, a control system, and a vehicle, with the aim of improving the efficiency of the motor drive system and reducing losses.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a motor drive system, comprising: a first battery, a second battery, a switching circuit, a generator, and a drive motor; both the first battery and the second battery are connected to the switching circuit, the switching circuit is also connected to the generator, and the generator is connected to the drive motor; the switching circuit is used to connect at least one of the first battery and the second battery to the switching circuit; at least one of the first battery and the second battery charges the coil of the generator, and the at least one of the first battery and the second battery, together with the generator, boosts the voltage of the drive motor.

[0007] Based on the above solutions, some embodiments of this application provide a motor drive system. This motor drive system provides different voltages by adjusting the connection between the first battery or the second battery and the switching circuit, thereby adapting to different working conditions, further improving the working efficiency of the motor drive system, and eliminating the DC-DC converter in the prior art, completely eliminating the energy loss, electromagnetic interference and other problems caused by the DC-DC converter, reducing the system size and improving the overall efficiency.

[0008] In some embodiments, the switching circuit includes: a switching sub-circuit and a first control sub-circuit; the switching sub-circuit is connected to a first battery and a second battery, and is also connected to the first control sub-circuit, which is connected to a generator; the switching sub-circuit is used to connect the first battery to the first control sub-circuit; or, connect the second battery to the first control sub-circuit; or, connect the first battery and the second battery and connect them to the first control sub-circuit; the first control sub-circuit is used to control the flow of electrical energy output from the first battery and / or the second battery to the coil of the generator to charge the coil of the generator.

[0009] In some embodiments, the switching sub-circuit includes: a first branch and a second branch; a first end of the first branch is connected to the positive terminal of the first battery, a second end of the first branch is connected to the first end of the first control sub-circuit, and a first switch is connected to the first branch; a first end of the second branch is connected to the negative terminal of the first battery, a second end of the second branch is connected to the generator, and a second switch is connected to the second branch; wherein, in a first driving mode, the first switch and the second switch are configured to be turned on, so that the first battery is connected to the first control sub-circuit; the first driving mode is a mode in which the first battery and the generator jointly boost the driving motor.

[0010] In some embodiments, the switching sub-circuit further includes: a third branch and a fourth branch; the first end of the third branch is connected to the positive terminal of the second battery, the second end of the third branch is connected to the first end of the fourth branch, and a third switch is connected to the third branch; the second end of the fourth branch is connected to the first end of the first control sub-circuit, and a fourth switch is connected to the fourth branch; the negative terminal of the second battery is connected to the generator; wherein, in the second drive mode, the third switch and the fourth switch are configured to be turned on to connect the second battery to the first control sub-circuit; the second drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0011] In some embodiments, the switching sub-circuit further includes: a fifth branch; a first end of the fifth branch is connected to the positive terminal of the second battery, a second end of the fifth branch is connected to the positive terminal of the first battery, and a fifth switch is connected to the fifth branch; wherein, in the third driving mode, the fifth switch and the fourth switch are configured to be turned on, so that the positive terminal of the first battery is connected to the positive terminal of the second battery, and the negative terminal of the first battery is connected to the first control sub-circuit; the third driving mode is a mode in which the voltage difference between the first battery and the second battery, and the generator jointly drive the drive motor.

[0012] In some embodiments, a diode is also connected to the fifth branch, with the positive terminal of the diode connected to the fifth switch and the negative terminal of the diode connected to the positive terminal of the first battery.

[0013] In some embodiments, the second end of the third branch is also connected to the negative terminal of the first battery; wherein, in the fourth driving mode, the third switch and the first switch are configured to be turned on so that the negative terminal of the first battery is connected to the positive terminal of the second battery, and the positive terminal of the first battery is connected to the first control sub-circuit; the third driving mode is a mode in which the voltage of the first battery and the second battery, together with the generator, jointly boost the drive motor.

[0014] In some embodiments, the switching sub-circuit further includes: a sixth branch and a seventh branch; the first end of the sixth branch is connected to a generator, the second end of the sixth branch is connected to a drive motor, and a sixth switch is connected to the sixth branch; the first end of the seventh branch is connected to the generator, the second end of the seventh branch is connected to the second end of the second branch and the negative terminal of the second battery, and a seventh switch is connected to the seventh branch; wherein, the sixth switch is configured to be turned on when the coil of the generator is being charged, so that the generator is connected to the negative terminal of the first battery or to the negative terminal of the second battery; the seventh switch is configured to be turned on when the drive motor is being driven, so that the generator is connected to the drive motor.

[0015] In some embodiments, the switching sub-circuit includes: an eighth branch, a ninth branch, and a tenth branch; the first end of the eighth branch is connected to the positive terminal of the first battery, the second end of the eighth branch is connected to the first terminal of the first control sub-circuit, and an eighth switch is connected to the eighth branch; the first end of the ninth branch is connected to the negative terminal of the first battery, the second end of the ninth branch is connected to the first terminal of the tenth branch, and a ninth switch is connected to the ninth branch; the second end of the tenth branch is connected to the generator, and a tenth switch is connected to the tenth branch; wherein, in the fifth drive mode, the eighth switch, the ninth switch, and the tenth switch are configured to be turned on, so that the first battery is connected to the first control sub-circuit; the fifth drive mode is a mode in which the first battery and the generator jointly boost the drive motor.

[0016] In some embodiments, the switching sub-circuit further includes: an eleventh branch and a twelfth branch; the first end of the eleventh branch is connected to the positive terminal of the second battery, the second end of the eleventh branch is connected to the second end of the ninth branch, and an eleventh switch is connected to the eleventh branch; the first end of the twelfth branch is connected to the first end of the ninth branch, the second end of the twelfth branch is connected to the first end of the first control sub-circuit, and a twelfth switch is connected to the twelfth branch; the negative terminal of the second battery is connected to the generator; wherein, in the sixth drive mode, the ninth switch, the eleventh switch, and the twelfth switch are configured to be turned on, so that the second battery is connected to the first control sub-circuit; the sixth drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0017] In some embodiments, the switching sub-circuit further includes: a thirteenth branch; the first end of the thirteenth branch is connected to the second end of the eleventh branch, the second end of the thirteenth branch is connected to the positive terminal of the first battery, and a thirteenth switch is connected to the thirteenth branch; wherein, in the seventh driving mode, the eleventh switch, the twelfth switch, and the thirteenth switch are configured to be turned on, so that the positive terminal of the first battery is connected to the positive terminal of the second battery, and the negative terminal of the first battery is connected to the first control sub-circuit; the seventh driving mode is a mode in which the voltage difference between the first battery and the second battery, and the generator jointly drive the drive motor.

[0018] In some embodiments, in the eighth driving mode, the eighth switch, the ninth switch, and the eleventh switch are configured to be turned on so that the negative terminal of the first battery is connected to the positive terminal of the second battery, and the positive terminal of the first battery is connected to the first control sub-circuit; the eighth driving mode is a mode in which the voltage of the first battery and the second battery, together with the generator, jointly boost the drive motor.

[0019] In some embodiments, the switching sub-circuit includes: a fourteenth branch and a fifteenth branch; the first end of the fourteenth branch is connected to the positive terminal of the first battery, the second end of the fourteenth branch is connected to the first terminal of the first control sub-circuit, and a fourteenth switch is connected to the fourteenth branch; the first end of the fifteenth branch is connected to the negative terminal of the first battery, the second end of the fifteenth branch is connected to the second terminal of the first control sub-circuit, and a fifteenth switch is connected to the fifteenth branch; wherein, in the ninth driving mode, the fourteenth switch and the fifteenth switch are configured to be turned on, so that the first battery is connected to the first control sub-circuit; the ninth driving mode is a mode in which the first battery and the generator jointly boost the drive motor.

[0020] In some embodiments, the switching sub-circuit further includes: a sixteenth branch; a first end of the sixteenth branch is connected to the positive terminal of the second battery, a second end of the sixteenth branch is connected to the second end of the fourteenth branch, and a sixteenth switch is connected to the sixteenth branch; wherein, in the tenth drive mode, the fourteenth switch and the sixteenth switch are configured to be turned on so that the second battery is connected to the first control sub-circuit; the tenth drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0021] In some embodiments, the switching sub-circuit further includes: a seventeenth branch; a first end of the seventeenth branch is connected to the negative terminal of the first battery, a second end of the seventeenth branch is connected to the second end of the fourteenth branch, and a seventeenth switch is connected to the seventeenth branch; wherein, in the eleventh drive mode, the sixteenth switch and the seventeenth switch are configured to be turned on, so that the positive terminal of the first battery is connected to the positive terminal of the second battery, and the negative terminal of the first battery is connected to the first control sub-circuit; the eleventh drive mode is a mode in which the voltage difference between the first battery and the second battery, and the generator jointly drive the drive motor.

[0022] In some embodiments, the first control sub-circuit includes: a first bridge arm; a first end of the first bridge arm is the first end of the first control sub-circuit, and a second end of the first bridge arm is the second end of the first control sub-circuit; a third end of the first bridge arm is correspondingly connected to the coil of the generator; wherein, the common connection end of the upper bridge arm and the lower bridge arm of the first bridge arm is the third end of the first bridge arm.

[0023] In some embodiments, the first bridge arm includes: a first switch sub-circuit and a second switch sub-circuit; the upper bridge arm of the first bridge arm is provided with the first switch sub-circuit, and the lower bridge arm of the first bridge arm is provided with the second switch sub-circuit; when at least one of the first battery and the second battery, and the generator jointly boost the drive motor, the first switch sub-circuit is turned on, and the second switch sub-circuit is turned off.

[0024] In some embodiments, the switching circuit further includes: a second control sub-circuit; a first terminal of the second control sub-circuit is connected to a first terminal of the first control sub-circuit, and a second terminal of the second control sub-circuit is connected to a second terminal of the first control sub-circuit; a third terminal of the second control sub-circuit is connected to the output terminal of the generator, and a fourth terminal of the second control sub-circuit is connected to the drive motor.

[0025] In some embodiments, the second control sub-circuit includes: a second bridge arm; a first end of the second bridge arm is a first end of the second control sub-circuit, and a second end of the second bridge arm is a second end of the second control sub-circuit; a third end of the second bridge arm is correspondingly connected to the coil of the drive motor; wherein, the common connection end of the upper bridge arm and the lower bridge arm of the second bridge arm is the third end of the second bridge arm.

[0026] In some embodiments, the second bridge arm includes a third switch sub-circuit and a fourth switch sub-circuit; the upper bridge arm of the second bridge arm is provided with the third switch sub-circuit, and the lower bridge arm of the second bridge arm is provided with the fourth switch sub-circuit; when the third switch sub-circuit is turned on, the fourth switch sub-circuit is turned off; or, when the third switch sub-circuit is turned off, the fourth switch sub-circuit is turned on.

[0027] In some embodiments, the switching circuit includes: a third control sub-circuit and a fourth control sub-circuit; a first terminal of the third control sub-circuit is connected to the positive terminal of the first battery and also to the negative terminal of the second battery; a second terminal of the third control sub-circuit is connected to the negative terminal of the first battery and a third terminal of the third control sub-circuit is connected to a generator; a first terminal of the fourth control sub-circuit is connected to the positive terminal of the second battery, a second terminal of the fourth control sub-circuit is connected to the negative terminal of the second battery, and a third terminal of the fourth control sub-circuit is connected to the generator.

[0028] In some embodiments, the third control sub-circuit includes: a third bridge arm; a first end of the third bridge arm is a first end of the third control sub-circuit, a second end of the third bridge arm is a second end of the third control sub-circuit; a third end of the third bridge arm is a third end of the third control sub-circuit; wherein, the common connection of the upper bridge arm and the lower bridge arm of the third bridge arm is the third end of the third bridge arm.

[0029] In some embodiments, the third bridge arm includes a fifth switch sub-circuit and a sixth switch sub-circuit; the upper bridge arm of the third bridge arm is provided with the fifth switch sub-circuit, and the lower bridge arm of the third bridge arm is provided with the sixth switch sub-circuit.

[0030] In some embodiments, the fourth control sub-circuit includes: a fourth bridge arm; a first end of the fourth bridge arm is a first end of the fourth control sub-circuit, a second end of the fourth bridge arm is a second end of the fourth control sub-circuit; a third end of the fourth bridge arm is a third end of the fourth control sub-circuit; wherein, the common connection of the upper bridge arm and the lower bridge arm of the fourth bridge arm is the third end of the fourth bridge arm.

[0031] In some embodiments, the fourth bridge arm includes a seventh switch sub-circuit and an eighth switch sub-circuit; the upper bridge arm of the fourth bridge arm is provided with the seventh switch sub-circuit, and the lower bridge arm of the fourth bridge arm is provided with the eighth switch sub-circuit.

[0032] In some embodiments, in the twelfth drive mode, the fifth and sixth switch sub-circuits are configured to be alternately turned on to connect the first battery to the generator; the twelfth drive mode is a mode in which the first battery and the generator jointly boost the drive motor.

[0033] In some embodiments, in the thirteenth drive mode, the seventh and eighth switch sub-circuits are configured to be alternately turned on to connect the second battery to the generator; the thirteenth drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0034] In some embodiments, in the fourteenth driving mode, the sixth and seventh switch sub-circuits are configured to be alternately turned on so that the positive terminal of the first battery is connected to the negative terminal of the second battery, and the first battery, the second battery and the generator are connected; the fourteenth driving mode is a mode in which the voltage of the first battery and the second battery, and the generator jointly boost drive the drive motor.

[0035] In some embodiments, the switching circuit includes: a first switch group, a second switch group, and a third switch group; a first terminal of the first switch group is connected to the positive terminal of the first battery, and a second terminal of the first switch group is connected to a generator; a first terminal of the second switch group is connected to the positive terminal of the second battery, and a second terminal of the second switch group is connected to the generator, and is also connected to the second terminals of the first switch group and the third switch group; a first terminal of the third switch group is connected to the negative terminal of the first battery, and is also connected to the negative terminal of the second battery.

[0036] In some embodiments, in the fifteenth drive mode, the first switch group and the third switch group are configured to be alternately turned on so that the first battery is connected to the generator; the fifteenth drive mode is a mode in which the first battery and the generator jointly boost the drive motor.

[0037] In some embodiments, in the sixteenth drive mode, the second switch group and the third switch group are configured to be alternately turned on so that the second battery is connected to the generator; the sixteenth drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0038] In some embodiments, in the seventeenth driving mode, the first switch group and the second switch group are configured to be alternately turned on so that the positive terminal of the first battery is connected to the negative terminal of the second battery, and the first battery, the second battery and the generator are connected; the seventeenth driving mode is a mode in which the voltage of the first battery and the second battery, and the generator jointly boost drive the drive motor.

[0039] In some embodiments, the rated voltage of the first battery is less than the rated voltage of the second battery.

[0040] Secondly, this application provides a motor drive system, which includes: a first battery, a second battery, a switching circuit, and a drive motor; both the first battery and the second battery are connected to the switching circuit, and the switching circuit is also connected to the drive motor; the switching circuit is used to connect at least one of the first battery and the second battery to the switching circuit; at least one of the first battery and the second battery supplies power to the drive motor.

[0041] Thirdly, this application provides a control system, including a motor drive system and a controller as provided in any of the above embodiments, wherein the controller is used to control the operation of the switching circuit in the motor drive system.

[0042] The beneficial effects of the second aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0043] Fourthly, this application provides a vehicle including the motor drive system provided in any of the above embodiments; and / or, the control system provided in any of the embodiments.

[0044] The beneficial effects of the third aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the topology of a multi-source inverter.

[0047] Figure 2 A schematic diagram of a motor drive system provided in an embodiment of this application;

[0048] Figure 3 A schematic diagram of a single-source lightweight application provided for an embodiment of this application;

[0049] Figure 4 A schematic diagram illustrating a single-source overload provided in an embodiment of this application;

[0050] Figure 5 A schematic diagram of a dual-source lightweight configuration provided in an embodiment of this application;

[0051] Figure 6 A schematic diagram of a dual-source overload provided in an embodiment of this application;

[0052] Figure 7 A schematic diagram illustrating a single-source overload provided in an embodiment of this application;

[0053] Figure 8 A schematic diagram of another motor drive system provided in an embodiment of this application;

[0054] Figure 9 A schematic diagram illustrating another single-source lightweight configuration provided in this application embodiment;

[0055] Figure 10 A schematic diagram illustrating another single-source overload provided in an embodiment of this application;

[0056] Figure 11 A schematic diagram of another dual-source light load provided for an embodiment of this application;

[0057] Figure 12 A schematic diagram illustrating another single-source overload provided in an embodiment of this application;

[0058] Figure 13 A schematic diagram of a drive motor discharging, provided as an embodiment of this application;

[0059] Figure 14 A schematic diagram of another drive motor discharge provided in an embodiment of this application;

[0060] Figure 15 A schematic diagram of yet another motor drive system provided in the embodiments of this application;

[0061] Figure 16 A schematic diagram illustrating yet another single-source lightweight configuration provided in an embodiment of this application;

[0062] Figure 17 A schematic diagram illustrating yet another single-source overload provided in an embodiment of this application;

[0063] Figure 18 A schematic diagram of yet another dual-source lightweight configuration provided in this application embodiment;

[0064] Figure 19 A schematic diagram of another type of drive motor discharge provided in an embodiment of this application;

[0065] Figure 20 A schematic diagram illustrating another type of drive motor discharge provided in an embodiment of this application;

[0066] Figure 21 A schematic diagram of yet another motor drive system provided in the embodiments of this application;

[0067] Figure 22 A schematic diagram illustrating yet another single-source lightweight configuration provided in an embodiment of this application;

[0068] Figure 23 A schematic diagram illustrating yet another single-source overload provided in an embodiment of this application;

[0069] Figure 24 A schematic diagram of yet another dual-source lightweight configuration provided in this application embodiment;

[0070] Figure 25 A schematic diagram of another type of drive motor discharge provided in an embodiment of this application;

[0071] Figure 26 A schematic diagram illustrating another type of drive motor discharge provided in an embodiment of this application;

[0072] Figure 27 A schematic diagram of yet another motor drive system provided in the embodiments of this application;

[0073] Figure 28 A schematic diagram illustrating yet another single-source lightweight configuration provided in an embodiment of this application;

[0074] Figure 29 A schematic diagram illustrating yet another single-source overload provided in an embodiment of this application;

[0075] Figure 30 A schematic diagram of yet another dual-source lightweight configuration provided in this application embodiment;

[0076] Figure 31 A schematic diagram of another type of drive motor discharge provided in an embodiment of this application;

[0077] Figure 32 A schematic diagram illustrating another type of drive motor discharge provided in an embodiment of this application;

[0078] Figure 33 A schematic diagram of another motor drive system provided in the embodiments of this application;

[0079] Figure 34 A schematic diagram of a control system provided in an embodiment of this application;

[0080] Figure 35 This is a schematic diagram of a vehicle provided in an embodiment of this application.

[0081] Reference numerals: 1. First battery; 2. Second battery; 3. Switching circuit; 30. Switching sub-circuit; 31. First control sub-circuit; 32. Second control sub-circuit; 33. Third control sub-circuit; 34. Fourth control sub-circuit; 4. Generator; 5. Drive motor; 61. First branch; 62. Second branch; 63. Third branch; 64. Fourth branch; 65. Fifth branch; 66. Sixth branch; 67. Seventh branch; 68. [Missing information - likely a reference to a specific branch or circuit] Branch 8; 69, Branch 9; 70, Branch 10; 71, Branch 11; 72, Branch 12; 73, Branch 13; 74, Branch 14; 75, Branch 15; 76, Branch 16; 77, Branch 17; 81, First Bridge Arm; 811, First Switch Sub-circuit; 812, Second Switch Sub-circuit; 82, Second Bridge Arm; 821, Third Switch Sub-circuit; 822, Fourth Switch Sub-circuit; 83, Third Bridge arm; 831, Fifth switch sub-circuit; 832, Sixth switch sub-circuit; 84, Fourth bridge arm; 841, Seventh switch sub-circuit; 842, Eighth switch sub-circuit; 91, First switch group; 92, Second switch group; 93, Third switch group; K1, First switch; K2, Second switch; K3, Third switch; K4, Fourth switch; K5, Fifth switch; K6, Sixth switch; K7, Seventh switch; K8, Eighth switch; K9, Ninth switch; K10, Tenth switch; K11, Eleventh switch; K12, Twelfth switch; K13, Thirteenth switch; K14, Fourteenth switch; K15, Fifteenth switch; K16, Sixteenth switch; K17, Seventeenth switch; K18, Eighteenth switch; C1, First capacitor; C2, Second capacitor; D1, Diode; 100, Motor drive system; 200, Control system; 210, Controller; 300, Vehicle. Detailed Implementation

[0082] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0083] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0084] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0085] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0087] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0088] With the development of new energy vehicle technology, hybrid energy storage systems are widely used in them. Traditionally, the control of hybrid energy storage systems uses a large number of high-power power electronic DC-DC converters, which results in a large system size, heavy weight, complex control, and high production cost. Moreover, the system efficiency is also limited by the loss of magnetic components.

[0089] Meanwhile, new energy vehicles have developed multi-motor drive systems such as dual-motor and tri-motor systems. Under different operating conditions, each motor has a different working state, and some motors are in standby mode, resulting in a low overall system utilization rate.

[0090] For example, refer to Figure 1 , Figure 1 It is a multi-source inverter topology that can effectively reduce production costs and improve the working efficiency of the electric drive platform. However, with the increasing demand for more complex operating conditions and the application of multi-motor drive systems such as dual-motor and tri-motor systems, it still cannot solve the problem of low motor efficiency under different operating conditions.

[0091] Based on this, embodiments of this application provide a motor drive system. For example... Figure 2 As shown, the motor drive system 100 includes: a first battery 1, a second battery 2, a switching circuit 3, a generator 4, and a drive motor 5.

[0092] The first battery 1 and the second battery 2 are both connected to the switch circuit 3. The switch circuit 3 is also connected to the generator 4, and the generator 4 is connected to the drive motor 5.

[0093] The switching circuit 3 is used to connect at least one of the first battery 1 and the second battery 2 to the switching circuit 3; at least one of the first battery 1 and the second battery 2 charges the coil of the generator 4, and at least one of the first battery 1 and the second battery 2, together with the generator 4, boosts the voltage of the drive motor 5.

[0094] In other words, the above connection methods fall into several categories.

[0095] In the first case: only the first battery 1 is connected to the switching circuit 3 to charge the coil of the generator 4, and then the first battery 1 and the generator 4 together boost the drive motor 5.

[0096] In the second case: only the second battery 2 is connected to the switching circuit 3 to charge the coil of the generator 4, and then the second battery 2 and the generator 4 together boost the voltage of the drive motor 5.

[0097] In the third case: the first battery 1 and the second battery 2 are connected, and both the first battery 1 and the second battery 2 are connected to the switch circuit 3 to charge the coil of the generator 4. Then the first battery 1, the second battery 2 and the generator 4 work together to boost the voltage of the drive motor 5.

[0098] In some embodiments, the rated voltage of the first battery 1 is less than the rated voltage of the second battery 2.

[0099] In this way, there are two possible scenarios when the first battery 1 and the second battery 2 are connected: one is that the voltage of the first battery 1 and the voltage of the second battery 2 are superimposed, and the other is that the voltage of the first battery 1 and the voltage of the second battery 2 are different.

[0100] In some embodiments, twice the rated voltage of the first battery 1 is not equal to the rated voltage of the second battery 2.

[0101] For example, the rated voltage of the first battery 1 is Vdc1, the rated voltage of the second battery 2 is Vdc2, Vdc1 < Vdc2 and 2Vdc1 ≠ Vdc2.

[0102] For the various scenarios described above: the voltage V0 of the generator 4 coil after charging, and the voltage of the drive motor 5 are respectively:

[0103] In the first scenario, only the first battery 1 is connected to the switching circuit 3 to charge the coil of the generator 4. Then, the first battery 1 and the generator 4 work together to boost the voltage of the drive motor 5. At this time, the voltage of the drive motor 5 is V0 + Vdc1.

[0104] In the second scenario, only the second battery 2 is connected to the switching circuit 3 to charge the coil of the generator 4. Then, the second battery 2 and the generator 4 work together to boost the voltage of the drive motor 5. At this time, the voltage of the drive motor 5 is V0 + Vdc2.

[0105] The third scenario: The first battery 1 and the second battery 2 are connected. Both the first battery 1 and the second battery 2 are connected to the switch circuit 3 to charge the coil of the generator 4. Then, the first battery 1, the second battery 2 and the generator 4 work together to boost the voltage of the drive motor 5. The voltage of the first battery 1 and the voltage of the second battery 2 are superimposed. At this time, the voltage of the drive motor 5 is V0 + Vdc1 + Vdc2.

[0106] The fourth scenario: The first battery 1 and the second battery 2 are connected. Both the first battery 1 and the second battery 2 are connected to the switch circuit 3 to charge the coil of the generator 4. Then, the first battery 1, the second battery 2 and the generator 4 work together to boost the voltage of the drive motor 5. The voltage of the first battery 1 is the difference between the voltage of the second battery 2. At this time, the voltage of the drive motor 5 is V0 + Vdc2 - Vdc1.

[0107] Based on the above solutions, some embodiments of this application provide a motor drive system 100. The motor drive system 100 provides different voltages by adjusting the connection between the first battery 1 or the second battery 2 and the switching circuit 3, thereby adapting to different working conditions, further improving the working efficiency of the motor drive system 100, and eliminating the DC-DC converter in the prior art, completely eliminating the energy loss, electromagnetic interference and other problems caused by the DC-DC converter, reducing the system size and improving the overall efficiency.

[0108] like Figure 2 As shown, in some embodiments, the switching circuit 3 includes a switching sub-circuit 30 and a first control sub-circuit 31.

[0109] The switching sub-circuit 30 is connected to the first battery 1 and the second battery 2. The switching sub-circuit 30 is also connected to the first control sub-circuit 31, which is connected to the generator 4.

[0110] The switching sub-circuit 30 is used to connect the first battery 1 to the first control sub-circuit 31; or, connect the second battery 2 to the first control sub-circuit 31; or, connect the first battery 1 and the second battery 2, and connect them to the first control sub-circuit 31.

[0111] The first control sub-circuit 31 is used to control the flow of electrical energy output from the first battery 1 and / or the second battery 2 to the coil of the generator 4, so as to charge the coil of the generator 4.

[0112] The main function of the switching sub-circuit 30 is to realize the above four situations, so that the voltage of the drive motor 5 corresponds to different voltages under different operating conditions: V0+Vdc1, V0+Vdc2, V0+Vdc1+Vdc2, V0+Vdc2-Vdc1.

[0113] Reference Figure 2 In some embodiments, the first control sub-circuit 31 includes a first bridge arm 81.

[0114] The first end of the first bridge arm 81 is the first end of the first control sub-circuit 31, and the second end of the first bridge arm 81 is the second end of the first control sub-circuit 31; the third end of the first bridge arm 81 is connected to the coil of the generator 4.

[0115] Among them, the common connection end of the upper and lower bridge arms of the first bridge arm 81 is the third end of the first bridge arm 81.

[0116] Reference Figure 2 In some embodiments, the first bridge arm 81 includes: a first switch sub-circuit 811 and a second switch sub-circuit 812.

[0117] The upper arm of the first bridge arm 81 is provided with a first switch sub-circuit 811, and the lower arm of the first bridge arm 81 is provided with a second switch sub-circuit 812; when at least one of the first battery 1 and the second battery 2, and the generator 4 jointly boost the drive motor 5, the first switch sub-circuit 811 is turned on and the second switch sub-circuit 812 is turned off.

[0118] Reference Figure 2 In some embodiments, the switching circuit 3 further includes a second control sub-circuit 32.

[0119] The first terminal of the second control sub-circuit 32 is connected to the first terminal of the first control sub-circuit 31, and the first terminal of the second control sub-circuit 32 is connected to the second terminal of the first control sub-circuit 31; the third terminal of the second control sub-circuit 32 is connected to the output terminal of the generator 4, and the fourth terminal of the second control sub-circuit 32 is connected to the drive motor 5.

[0120] Reference Figure 2 In some embodiments, the second control sub-circuit 32 includes a second bridge arm 82.

[0121] The first end of the second bridge arm 82 is the first end of the second control sub-circuit 32, and the second end of the second bridge arm 82 is the second end of the second control sub-circuit 32; the third end of the second bridge arm 82 is connected to the coil of the drive motor 5.

[0122] The common connection point of the upper and lower bridge arms of the second bridge arm 82 is the third end of the second bridge arm 82.

[0123] Reference Figure 2 In some embodiments, the second bridge arm 82 includes a third switch sub-circuit 821 and a fourth switch sub-circuit 822.

[0124] The upper arm of the second bridge arm 82 is provided with a third switch sub-circuit 821, and the lower arm of the second bridge arm 82 is provided with a fourth switch sub-circuit 822; when the third switch sub-circuit 821 is turned on, the fourth switch sub-circuit 822 is turned off; or, when the third switch sub-circuit 821 is turned off, the fourth switch sub-circuit 822 is turned on.

[0125] In other words, the third switch sub-circuit 821 and the fourth switch sub-circuit 822 will not be turned on or off at the same time.

[0126] In some embodiments, the first switch sub-circuit 811, the second switch sub-circuit 812, the third switch sub-circuit 821 and the fourth switch sub-circuit 822 all include high-frequency switching devices to improve the response speed and stability of bridge arm switching.

[0127] For example, it can be any one or any combination of high-frequency switches such as thyristors, IGBTs, and MOSFETs.

[0128] Among them, the appendix Figure 2 In the first switch sub-circuit 811, a1, b1, and c1 refer to the designations of the high-frequency switching devices. a1 refers to any one of the thyristors, IGBTs, and MOSFETs in the first first switch sub-circuit 811; b1 refers to any one of the thyristors, IGBTs, and MOSFETs in the second first switch sub-circuit 811; and c1 refers to any one of the thyristors, IGBTs, and MOSFETs in the third first switch sub-circuit 811.

[0129] Appendix Figure 2 In the second switch sub-circuit 812, a2, b2, and c2 refer to the designations of the high-frequency switching devices. a2 refers to any one of the thyristors, IGBTs, and MOSFETs in the first second switch sub-circuit 812; b2 refers to any one of the thyristors, IGBTs, and MOSFETs in the second second switch sub-circuit 812; and c2 refers to any one of the thyristors, IGBTs, and MOSFETs in the third second switch sub-circuit 812.

[0130] Appendix Figure 2 In the third switch sub-circuit 821, d1, e1, and f1 refer to the designations of the high-frequency switching devices. d1 refers to any one of the thyristors, IGBTs, and MOSFETs in the first third switch sub-circuit 821; e1 refers to any one of the thyristors, IGBTs, and MOSFETs in the second third switch sub-circuit 821; and f1 refers to any one of the thyristors, IGBTs, and MOSFETs in the third third switch sub-circuit 821.

[0131] Appendix Figure 2 In the circuit diagram, d2, e2, and f2 refer to the designations of the high-frequency switching devices in the fourth switching sub-circuit 822. d2 refers to any one of the thyristors, IGBTs, and MOSFETs in the first fourth switching sub-circuit 822; e2 refers to any one of the thyristors, IGBTs, and MOSFETs in the second fourth switching sub-circuit 822; and f2 refers to any one of the thyristors, IGBTs, and MOSFETs in the third fourth switching sub-circuit 822.

[0132] In some embodiments, the switching sub-circuit 30 includes: an eighteenth switch K18, a first capacitor C1, and a second capacitor C2.

[0133] The first capacitor C1 is connected in parallel with the first battery 1, and the second capacitor C2 is connected in parallel with the second battery 2. The first capacitor C1 and the second capacitor C2 serve as filters and also suppress transient interference, making the circuit more stable.

[0134] The first end of the eighteenth switch K18 is connected to the first end of the first control sub-circuit 31, and the second end of the eighteenth switch K18 is connected to the first end of the second control sub-circuit 32.

[0135] like Figure 3 As shown, in some embodiments, the switching sub-circuit 30 includes: a first branch 61 and a second branch 62.

[0136] The first end of the first branch 61 is connected to the positive terminal of the first battery 1, the second end of the first branch 61 is connected to the first end of the first control sub-circuit 31, and the first switch K1 is connected to the first branch 61; the first end of the second branch 62 is connected to the negative terminal of the first battery 1, the second end of the second branch 62 is connected to the generator 4, and the second switch K2 is connected to the second branch 62.

[0137] In the first drive mode (single-source light load), the first switch K1 and the second switch K2 are configured to be turned on so that the first battery 1 is connected to the first control sub-circuit 31; the first drive mode is a mode in which the first battery 1 and the generator 4 jointly boost the drive motor 5.

[0138] The single-source light-load system is based on the first battery. In the first drive mode, the generator's three-phase windings (coils) act as boost inductors. The specific switch states are shown in Table 1 below. Switches not involved in operation are normally open switches (open circuit, non-conducting); switches involved in operation and maintaining their operating state are normally closed switches (closed circuit, conducting); switches involved in operation whose operating state changes with each step are control switches. Since the upper and lower sets of switches a1, b1, c1, d1, e1, f1 and a2, b2, c2, d2, e2, f2 have opposite states during operation, 0 represents upper open and lower closed, and 1 represents upper closed and lower open. Specifically, when 0, a1 is open and a2 is closed. Switch 1 represents closed, and 0 represents open. The switching action is divided into two stages:

[0139] First stage: voltage boosting stage, the generator's inductors (coils) are charged, and the three-phase inductor voltage of the generator is V0 at this time.

[0140] Second stage: driving stage, the drive motor is driven, and the voltage platform of the drive motor is V0+Vdc1.

[0141]

[0142] Table 1

[0143] U in Table 1 AB It means Figure 3 The voltage across coils A and B of the drive motor is shown in Table 1. BC It means Figure 3 The voltage across coils B and C of the drive motor is shown in Table 1. CA It means Figure 3 The voltage across coils C and A of the drive motor.

[0144] For example, as shown in Table S6 above: when the sixth switch is on and the seventh switch is off, a1, b1, c1, d1, e2, and f2 are on, while a2, b2, c2, d2, e1, and f1 are off. Since d1 and e2 are on, a circuit is formed, U... AB For V0 + Vdc1; since e1 and f1 are disconnected, no loop is formed, U BC The value is 0; since d1 and f2 are conducting, a loop is formed, and the direction is from C to A, therefore U CA =-(V0+Vdc1), i.e., U CA It is -V0-Vdc1.

[0145] The other states are all controlled by turning the switch on and off to make the drive motor output different voltages. These will not be analyzed in detail here. Please refer to Table 1 for details.

[0146] It should be noted that the lighter-colored parts in the circuit diagram indicate that the device is not in use or is in an open state. Subsequent diagrams will use this method to show the specific working state.

[0147] like Figure 4 As shown, in some embodiments, the switching sub-circuit further includes a third branch and a fourth branch.

[0148] The first end of the third branch is connected to the positive terminal of the second battery, the second end of the third branch is connected to the first end of the fourth branch, and a third switch is connected to the third branch; the second end of the fourth branch is connected to the first end of the first control sub-circuit, and a fourth switch is connected to the fourth branch; the negative terminal of the second battery is connected to the generator.

[0149] In the second drive mode (single-source heavy load), the third and fourth switches are configured to be turned on so that the second battery is connected to the first control sub-circuit; the second drive mode is a mode in which the second battery and the generator jointly boost the drive motor.

[0150] Single-source heavy load is based on a second battery. In the second drive mode, the generator's three-phase windings (coils) act as boost inductors. Specific switch states are shown in Table 2 below. Switches not involved in operation are normally open switches (open circuit, non-conducting); switches involved in operation and maintaining their operating state are normally closed switches (closed circuit, conducting); switches involved in operation whose operating state changes with each step are control switches. Since the upper and lower sets of switches a1, b1, c1, d1, e1, f1 and a2, b2, c2, d2, e2, f2 have opposite states during operation, 0 represents upper open, lower closed, and 1 represents upper closed, lower open. Specifically, when 0, a1 is open, and a2 is closed. Switch 1 represents closed, and 0 represents open. Switch operation is divided into two stages:

[0151] First stage: voltage boosting stage, the generator's inductors (coils) are charged, and the three-phase inductor voltage of the generator is V0 at this time.

[0152] Second stage: driving stage, the drive motor is driven, and the voltage platform of the drive motor is V0+Vdc2.

[0153]

[0154] Table 2

[0155] U in Table 2 AB It means Figure 4 The voltage across coils A and B of the drive motor is shown in Table 2. BC It means Figure 4 The voltage across coils B and C of the drive motor is shown in Table 2. CA It means Figure 4 The voltage across coils C and A of the drive motor.

[0156] For example, as shown in Table S6 above: when the sixth switch is on and the seventh switch is off, a1, b1, c1, d1, e2, and f2 are on, while a2, b2, c2, d2, e1, and f1 are off. Since d1 and e2 are on, a circuit is formed, U... AB The value is V0 + Vdc2; since e1 and f1 are disconnected, no loop is formed, U BC The value is 0; since d1 and f2 are conducting, a loop is formed, and the direction is from C to A, therefore U CA =-(V0+Vdc2), i.e., U CA It is -V0-Vdc2.

[0157] like Figure 5 As shown, in some embodiments, the switching sub-circuit 30 further includes a fifth branch 65.

[0158] The first end of the fifth branch 65 is connected to the positive terminal of the second battery, the second end of the fifth branch 65 is connected to the positive terminal of the first battery, and the fifth switch K5 is connected to the fifth branch.

[0159] In the third drive mode (dual-source light load), the fifth switch K5 and the fourth switch K4 are configured to be turned on so that the positive terminal of the first battery is connected to the positive terminal of the second battery, and the negative terminal of the first battery is connected to the first control sub-circuit. The third drive mode is a mode in which the voltage difference between the first battery and the second battery, as well as the generator, jointly drive the drive motor.

[0160] The dual-source light-load system is based on the first and second batteries. In the third drive mode, the generator's three-phase windings (coils) act as boost inductors. The specific switching states are shown in Table 3 below. Switches not involved in operation are normally open switches (open circuit, non-conducting); switches involved in operation and maintaining their operating state are normally closed switches (closed circuit, conducting); switches involved in operation whose operating state changes with each step are control switches. Since the upper and lower sets of switches a1, b1, c1, d1, e1, f1 and a2, b2, c2, d2, e2, f2 have opposite states during operation, 0 represents upper open and lower closed, and 1 represents upper closed and lower open. Specifically, when 0, a1 is open and a2 is closed. Switch 1 represents closed, and 0 represents open. The switching action is divided into two stages:

[0161] First stage: voltage boosting stage, the generator's inductors (coils) are charged, and the three-phase inductor voltage of the generator is V0 at this time.

[0162] Second stage: driving stage, the drive motor is driven, and the voltage platform of the drive motor is V0+Vdc2-Vdc1.

[0163]

[0164] Table 3

[0165] U in Table 3 AB It means Figure 5 The voltage across coils A and B of the drive motor is shown in Table 3. BC It means Figure 5 The voltage across coils B and C of the drive motor is shown in Table 3. CA It means Figure 5 The voltage across coils C and A of the drive motor.

[0166] For example, as shown in Table S6 above: when the sixth switch is on and the seventh switch is off, a1, b1, c1, d1, e2, and f2 are on, while a2, b2, c2, d2, e1, and f1 are off. Since d1 and e2 are on, a circuit is formed, U... ABThe value is V0 + Vdc2 - Vdc1; since e1 and f1 are disconnected, no loop is formed, U BC The value is 0; since d1 and f2 are conducting, a loop is formed, and the direction is from C to A, therefore U CA =-(V0+Vdc2-Vdc1), i.e., U CA It is -V0-Vdc2+Vdc1.

[0167] Reference Figures 3-6 In some embodiments, a diode is also connected to the fifth branch 65, with the positive terminal of the diode connected to the fifth switch K5 and the negative terminal of the diode connected to the positive terminal of the first battery.

[0168] like Figure 6 As shown, in some embodiments, the second end of the third branch is also connected to the negative terminal of the first battery.

[0169] In the fourth drive mode (dual-source heavy load), the third switch and the first switch are configured to be turned on so that the negative terminal of the first battery is connected to the positive terminal of the second battery, and the positive terminal of the first battery is connected to the first control sub-circuit; the third drive mode is a mode in which the voltage of the first battery and the second battery, together with the generator, jointly boost the drive motor.

[0170] Dual-source heavy-duty operation is based on the first and second batteries. In the fourth drive mode, the generator's three-phase windings (coils) act as boost inductors. Specific switch states are shown in Table 4 below. Switches not involved in operation are normally open switches (open circuit, non-conducting); switches involved in operation and maintaining their operating state are normally closed switches (closed circuit, conducting); switches involved in operation whose operating state changes with each step are control switches. Since the upper and lower sets of switches a1, b1, c1, d1, e1, f1 and a2, b2, c2, d2, e2, f2 have opposite states during operation, 0 represents upper open, lower closed, and 1 represents upper closed, lower open. Specifically, when 0, a1 is open, and a2 is closed. For group T switches, 1 represents closed, and 0 represents open. Switching operations are divided into two stages:

[0171] The first stage is the voltage boosting stage, during which the generator's inductors (coils) are charged, and the three-phase inductor voltage of the generator is V0.

[0172] Second stage: driving stage, the drive motor is driven, and the voltage platform of the drive motor is V0+Vdc2+Vdc1.

[0173]

[0174] Table 4

[0175] U in Table 4 AB It means Figure 6The voltage across coils A and B of the drive motor is shown in Table 4, U. BC It means Figure 6 The voltage across coils B and C of the drive motor is shown in Table 4. CA It means Figure 6 The voltage across coils C and A of the drive motor.

[0176] For example, as shown in Table S6 above: when the sixth switch is on and the seventh switch is off, a1, b1, c1, d1, e2, and f2 are on, while a2, b2, c2, d2, e1, and f1 are off. Since d1 and e2 are on, a circuit is formed, U... AB The value is V0 + Vdc2 + Vdc1; since e1 and f1 are disconnected, no loop is formed, U BC The value is 0; since d1 and f2 are conducting, a loop is formed, and the direction is from C to A, therefore U CA It is -(V0+Vdc2+Vdc1), that is, U CA It is -V0-Vdc2-Vdc1.

[0177] Reference Figure 7 In the above mode, the first battery 1 and / or the second battery 2 achieve voltage platform enhancement through the inductor of the generator 4 connected in series, and the enhancement effect is as follows: Figure 7 As shown, after the voltage is boosted by the inductor, the voltage plateau is increased, the peak inflection point of the external characteristic shifts towards high speed, and the high-efficiency region shifts towards high speed and high torque.

[0178] in, Figure 7 The horizontal axis represents rotational speed, measured in rpm (revolutions per minute). Revolutions per minute (rpm) indicates the number of times an object revolves around its center in one minute. It is a unit for measuring rotational speed. The vertical axis represents torque, measured in Nm (newton-meters), which is the product of force and lever arm.

[0179] Figure 7 In the diagram, the gray area represents the multiplexed motor inductor boost platform, while the light gray area represents the voltage platform. We can clearly see that, at the same speed, the multiplexed motor inductor boost platform can provide higher torque than the voltage platform. This intuitively demonstrates that by boosting the voltage through series motor inductors, the voltage platform is significantly improved.

[0180] An increase in voltage platform means that the motor can obtain a higher input voltage. According to the principles of motor theory, under the same current, the higher the voltage, the greater the output power and torque of the motor. Therefore, an increase in voltage platform directly enhances the driving capability of the motor, enabling it to output greater torque and meet the demands of higher loads.

[0181] Meanwhile, the area of ​​the multi-functional motor inductor boost platform expands significantly to the upper right. This means that compared to the voltage platform, the motor can still maintain higher torque output at higher speeds. The inflection point of the external characteristic peak shifts towards higher speeds, indicating that the motor can still maintain good performance at high speeds. This is crucial for applications requiring the motor to operate within a high-speed range, such as high-speed cruising in electric vehicles, ensuring that the motor can still provide sufficient torque at high speeds to guarantee the normal operation of the equipment.

[0182] Furthermore, the shift of the high-efficiency zone towards high-speed, high-torque refers to:

[0183] At the same speed, the motor can maintain efficient operation in a higher torque range, which can significantly improve the overall efficiency of the system and reduce energy consumption.

[0184] At the same torque, the motor can maintain efficient operation at higher speeds, which can extend the motor's efficient operating range and improve the system's adaptability.

[0185] like Figure 8 and Figure 9 As shown, in some embodiments, the switching sub-circuit 30 includes: an eighth branch 68, a ninth branch 69, and a tenth branch 70.

[0186] The first end of the eighth branch 68 is connected to the positive terminal of the first battery 1, and the second end of the eighth branch 68 is connected to the first end of the first control sub-circuit 31. The eighth switch K8 is connected to the eighth branch 68. The first end of the ninth branch 69 is connected to the negative terminal of the first battery 1, and the second end of the ninth branch 69 is connected to the first end of the tenth branch 70. The ninth switch K9 is connected to the ninth branch 69. The second end of the tenth branch 70 is connected to the generator 4, and the tenth switch K10 is connected to the tenth branch 70.

[0187] In the fifth drive mode (single source light load), the eighth switch K8, the ninth switch K9 and the tenth switch K10 are configured to be turned on so that the first battery 1 is connected to the first control sub-circuit 31; the fifth drive mode is a mode in which the first battery 1 and the generator 4 jointly boost the drive motor 5.

[0188] In other words, in the fifth drive mode, only the first battery 1 supplies power to the generator 4.

[0189] like Figure 8 and Figure 10 As shown, in some embodiments, the switching sub-circuit 30 further includes an eleventh branch 71 and a twelfth branch 72.

[0190] The first end of the eleventh branch 71 is connected to the positive terminal of the second battery 2, the second end of the eleventh branch 71 is connected to the second end of the ninth branch 69, and the eleventh switch K11 is connected to the eleventh branch 71; the first end of the twelfth branch 72 is connected to the first end of the ninth branch 69, the second end of the twelfth branch 72 is connected to the first end of the first control sub-circuit 31, and the twelfth switch K12 is connected to the twelfth branch 72; the negative terminal of the second battery 2 is connected to the generator 4.

[0191] In the sixth drive mode (single-source heavy load), the ninth switch K9, the eleventh switch K11 and the twelfth switch K12 are configured to be turned on so that the second battery 2 is connected to the first control sub-circuit 31; the sixth drive mode is a mode in which the second battery 2 and the generator 4 jointly boost the drive motor 5.

[0192] like Figure 8 and Figure 11 As shown, in some embodiments, the switching sub-circuit 30 further includes a thirteenth branch 73.

[0193] The first end of the thirteenth branch 73 is connected to the second end of the eleventh branch 71, the second end of the thirteenth branch 73 is connected to the positive terminal of the first battery 1, and the thirteenth switch K13 is connected to the thirteenth branch 73.

[0194] In the seventh drive mode (dual-source light load), the eleventh switch K11, the twelfth switch K12 and the thirteenth switch K13 are configured to be turned on so that the positive terminal of the first battery 1 is connected to the positive terminal of the second battery 2, and the negative terminal of the first battery 1 is connected to the first control sub-circuit 31. The seventh drive mode is a mode in which the voltage difference between the first battery 1 and the second battery 2, and the generator 4 jointly drive the drive motor 5.

[0195] like Figure 8 and Figure 12 As shown, in some embodiments, in the eighth drive mode (dual-source heavy load), the eighth switch K8, the ninth switch K9 and the eleventh switch K11 are configured to be turned on so that the negative terminal of the first battery 1 is connected to the positive terminal of the second battery 2, and the positive terminal of the first battery 1 is connected to the first control sub-circuit 31; the eighth drive mode is a mode in which the voltage of the first battery 1 and the second battery 2, together with the generator 4, jointly boost the drive motor 5.

[0196] like Figure 13 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the first battery 1 through the eighth switch K8 to charge the first battery 1.

[0197] like Figure 14As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the second battery 2 through the twelfth switch K12, the ninth switch K9 and the eleventh switch K11 to charge the second battery 2.

[0198] like Figure 15 and Figure 16 As shown, in some embodiments, the switching sub-circuit 30 includes a fourteenth branch 74 and a fifteenth branch 75.

[0199] The first end of the fourteenth branch 74 is connected to the positive terminal of the first battery 1, the second end of the fourteenth branch 74 is connected to the first end of the first control sub-circuit 31, and the fourteenth switch K14 is connected to the fourteenth branch 74; the first end of the fifteenth branch 75 is connected to the negative terminal of the first battery 1, the second end of the fifteenth branch 75 is connected to the second end of the first control sub-circuit 31, and the fifteenth switch K15 is connected to the fifteenth branch 75.

[0200] In the ninth drive mode (single-source light load), the fourteenth switch K14 and the fifteenth switch K15 are configured to be turned on so that the first battery 1 is connected to the first control sub-circuit 31; the ninth drive mode is a mode in which the first battery 1 and the generator 4 jointly boost the drive motor 5.

[0201] like Figure 15 and Figure 17 As shown, in some embodiments, the switching sub-circuit 30 further includes: a sixteenth branch 76; the first end of the sixteenth branch 76 is connected to the positive terminal of the second battery 2, the second end of the sixteenth branch 76 is connected to the second end of the fourteenth branch 74, and a sixteenth switch K16 is connected to the sixteenth branch 76; wherein, in the tenth drive mode (single source heavy load), the fourteenth switch K14 and the sixteenth switch K16 are configured to be turned on so that the second battery 2 is connected to the first control sub-circuit 31; the tenth drive mode is a mode in which the second battery 2 and the generator 4 jointly boost the drive motor 5.

[0202] like Figure 15 and Figure 18 As shown, in some embodiments, the switching sub-circuit 30 further includes a seventeenth branch 77.

[0203] The first end of the seventeenth branch 77 is connected to the negative terminal of the first battery 1, the second end of the thirteenth branch 73 is connected to the second end of the fourteenth branch 74, and the seventeenth switch K17 is connected to the seventeenth branch 77.

[0204] In the eleventh drive mode (dual-source light load), the sixteenth switch K16 and the seventeenth switch K17 are configured to be turned on so that the positive terminal of the first battery 1 is connected to the positive terminal of the second battery 2, and the negative terminal of the first battery 1 is connected to the first control sub-circuit 31. The eleventh drive mode is a mode in which the voltage difference between the first battery 1 and the second battery 2, and the generator 4 jointly drive the drive motor 5.

[0205] like Figure 19 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the first battery 1 through the fourteenth switch K14 to charge the first battery 1.

[0206] like Figure 20 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the second battery 2 through the fourteenth switch K14 and the sixteenth switch K16 to charge the second battery 2.

[0207] like Figure 21 As shown, in some embodiments, the switching circuit 3 includes: a third control sub-circuit 33 (corresponding to Q1~Q6) and a fourth control sub-circuit 34 (corresponding to Q7~Q12).

[0208] The first terminal of the third control sub-circuit 33 is connected to the positive terminal of the first battery 1 and the negative terminal of the second battery 2; the second terminal of the third control sub-circuit 33 is connected to the negative terminal of the first battery 1 and the third terminal of the third control sub-circuit 33 is connected to the generator 4; the first terminal of the fourth control sub-circuit 34 is connected to the positive terminal of the second battery 2, the second terminal of the fourth control sub-circuit 34 is connected to the negative terminal of the second battery 2 and the third terminal of the fourth control sub-circuit 34 is connected to the generator 4.

[0209] Reference Figure 21 In some embodiments, the third control sub-circuit 33 includes: a third bridge arm 83; the first end of the third bridge arm 83 is the first end of the third control sub-circuit 33, the second end of the third bridge arm 83 is the second end of the third control sub-circuit 33, and the third end of the third bridge arm 83 is the third end of the third control sub-circuit 33.

[0210] Among them, the common connection end of the upper and lower bridge arms of the third bridge arm 83 is the third end of the third bridge arm 83.

[0211] Reference Figure 21 In some embodiments, the third bridge arm 83 includes a fifth switch sub-circuit 831 and a sixth switch sub-circuit 832; the upper bridge arm of the third bridge arm 83 is provided with the fifth switch sub-circuit 831, and the lower bridge arm of the third bridge arm 83 is provided with the sixth switch sub-circuit 832.

[0212] Reference Figure 21 In some embodiments, the fourth control sub-circuit 34 includes: a fourth bridge arm 84; a first end of the fourth bridge arm 84 is the first end of the fourth control sub-circuit 34, a second end of the fourth bridge arm 84 is the second end of the fourth control sub-circuit 34; a third end of the fourth bridge arm 84 is the third end of the fourth control sub-circuit 34; wherein, the common connection of the upper bridge arm and the lower bridge arm of the fourth bridge arm 84 is the third end of the fourth bridge arm 84.

[0213] Reference Figure 21 In some embodiments, the fourth bridge arm 84 includes a seventh switch sub-circuit 841 and an eighth switch sub-circuit 842; the upper bridge arm of the fourth bridge arm 84 is provided with the seventh switch sub-circuit 841, and the lower bridge arm of the fourth bridge arm 84 is provided with the eighth switch sub-circuit 842.

[0214] like Figure 22 As shown, in some embodiments, in the twelfth drive mode (single-source light load), the fifth switch sub-circuit 831 and the sixth switch sub-circuit 832 are configured to be alternately turned on so that the first battery 1 is connected to the generator 4; the twelfth drive mode is a mode in which the first battery 1 and the generator 4 jointly boost the drive motor 5.

[0215] like Figure 23 As shown, in some embodiments, in the thirteenth drive mode (single-source heavy load), the seventh switch sub-circuit 841 and the eighth switch sub-circuit 842 are configured to be alternately turned on so that the second battery 2 is connected to the generator 4; the thirteenth drive mode is a mode in which the second battery 2 and the generator 4 jointly boost the drive motor 5.

[0216] like Figure 24 As shown, in some embodiments, in the fourteenth drive mode (dual-source light load), the sixth switch sub-circuit 832 and the seventh switch sub-circuit 841 are configured to be alternately turned on so that the positive terminal of the first battery 1 is connected to the negative terminal of the second battery 2, and the first battery 1, the second battery 2 are connected to the generator 4; the fourteenth drive mode is a mode in which the voltage of the first battery 1 and the second battery 2, together with the generator 4, jointly boost the drive motor 5.

[0217] like Figure 25 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the first battery 1 through the fifth switch sub-circuit 831 to charge the first battery 1.

[0218] like Figure 26 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the second battery 2 through the seventh switch sub-circuit 841 to charge the second battery 2.

[0219] like Figure 27 As shown, in some embodiments, the switching circuit 3 includes: a first switch group 91 (h1~h3), a second switch group 92 (k1~k3) and a third switch group 93 (g1~g3).

[0220] The first end of the first switch group 91 is connected to the positive terminal of the first battery 1, and the second end of the first switch group 91 is connected to the generator 4; the first end of the second switch group 92 is connected to the positive terminal of the second battery 2, and the second end of the second switch group 92 is connected to the generator 4, as well as the second end of the first switch group 91 and the second end of the third switch group 93; the first end of the third switch group 93 is connected to the negative terminal of the first battery 1, and also to the negative terminal of the second battery 2.

[0221] like Figure 28 As shown, in some embodiments, in the fifteenth drive mode (single-source light load), the first switch group 91 and the third switch group 93 are configured to be alternately turned on so that the first battery 1 is connected to the generator 4; the fifteenth drive mode is a mode in which the first battery 1 and the generator 4 jointly boost the drive motor 5.

[0222] like Figure 29 As shown, in some embodiments, in the sixteenth drive mode (single-source heavy load), the second switch group 92 and the third switch group 93 are configured to be alternately turned on so that the second battery 2 is connected to the generator 4; the sixteenth drive mode is a mode in which the second battery 2 and the generator 4 jointly boost the drive motor 5.

[0223] like Figure 30 As shown, in some embodiments, in the seventeenth drive mode (dual-source light load), the first switch group 91 and the second switch group 92 are configured to be alternately turned on so that the positive terminal of the first battery 1 is connected to the negative terminal of the second battery 2, and the first battery 1, the second battery 2 are connected to the generator 4; the seventeenth drive mode is a mode in which the voltage of the first battery 1 and the second battery 2, together with the generator 4, boost the drive motor 5.

[0224] like Figure 31 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the first battery 1 through the first switch group 91 to charge the first battery 1.

[0225] like Figure 32 As shown, in some embodiments, the generator 4 can also discharge to the battery, that is, the generator 4 generates current and returns it to the positive terminal of the second battery 2 through the second switch group 92 to charge the second battery 2.

[0226] It should be noted that, Figures 8-32The generator 4 is also connected to the drive motor 5 (not shown in the figure). For details of the connection, please refer to [reference needed]. Figure 2 .

[0227] like Figure 33 As shown, this application provides a motor drive system. The motor drive system 100 includes: a first battery 1, a second battery 2, a switching circuit 3, and a drive motor 5.

[0228] The first battery 1 and the second battery 2 are both connected to the switch circuit 3, which is also connected to the drive motor 5. The switch circuit 3 is used to connect at least one of the first battery 1 and the second battery 2 to the switch circuit 3. At least one of the first battery 1 and the second battery 2 supplies power to the drive motor 5.

[0229] In other words, a generator can be used to boost the voltage of the drive motor. Specific implementation examples can be found above. Figures 8-32 , Figures 8-32 The generator can be replaced with a drive motor. Figure 33 This is only one embodiment; other embodiments are as described above. Figures 8-32 That's all; I won't go into details here.

[0230] like Figure 34 As shown, this application also provides a control system 200, including a motor drive system 100 and a controller 210 as provided in any of the above embodiments.

[0231] The controller 210 is used to control the operation of the switching circuit 3 in the motor drive system 100.

[0232] like Figure 35 As shown, this application provides a vehicle 300, including the motor drive system 100 provided in any of the above embodiments; and / or the control system 200 provided in any of the embodiments.

[0233] For example, if vehicle 300 is a new energy vehicle, during normal operation, different voltages are supplied to drive motor 5 by controlling the on and off states of switch circuit 3, thereby improving its efficiency under different operating conditions. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0234] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A motor drive system (100), characterized in that, include: The components include a first battery (1), a second battery (2), a switching circuit (3), a generator (4), and a drive motor (5). The first battery (1) and the second battery (2) are both connected to the switching circuit (3), the switching circuit (3) is also connected to the generator (4), and the generator (4) is connected to the drive motor (5); The switching circuit (3) is used to connect at least one of the first battery (1) and the second battery (2) to the switching circuit (3); at least one of the first battery (1) and the second battery (2) charges the coil of the generator (4); at least one of the first battery (1) and the second battery (2), together with the generator (4), boosts the voltage of the drive motor (5); When at least one of the first battery (1) and the second battery (2), and the generator (4) jointly boost the drive motor (5), the drive modes include: a first drive mode, a second drive mode, a third drive mode and a fourth drive mode; Alternatively, when at least one of the first battery (1) and the second battery (2), and the generator (4) jointly boost the drive motor (5), the drive modes include: the first drive mode, the second drive mode and the third drive mode; Alternatively, when at least one of the first battery (1) and the second battery (2), and the generator (4) jointly boost the drive motor (5), the drive modes include: the first drive mode, the second drive mode and the fourth drive mode; The first driving mode is a mode in which the first battery (1) and the generator (4) jointly boost the driving motor (5); The second driving mode is a mode in which the second battery (2) and the generator (4) jointly boost the driving motor (5); The third driving mode is a mode in which the voltage difference between the first battery (1) and the second battery (2) and the generator (4) jointly drive the drive motor (5); The fourth driving mode is a mode in which the voltage of the first battery (1) and the second battery (2) and the generator (4) jointly boost the driving motor (5); The rated voltage of the first battery (1) is less than the rated voltage of the second battery (2); the driving voltage provided to the drive motor (5) in the first driving mode, the second driving mode, the third driving mode and the fourth driving mode are different.

2. The motor drive system (100) according to claim 1, characterized in that, The switching circuit (3) includes: a switching sub-circuit (30) and a first control sub-circuit (31); The switching sub-circuit (30) is connected to the first battery (1) and the second battery (2), and the switching sub-circuit (30) is also connected to the first control sub-circuit (31), which is connected to the generator (4). The switching sub-circuit (30) is used to connect the first battery (1) to the first control sub-circuit (31); or to connect the second battery (2) to the first control sub-circuit (31); or to connect the first battery (1) and the second battery (2) and connect them to the first control sub-circuit (31). The first control sub-circuit (31) is used to control the electrical energy output by the first battery (1) and / or the second battery (2) to flow to the coil of the generator (4) to charge the coil of the generator (4).

3. The motor drive system (100) according to claim 2, characterized in that, The switching sub-circuit (30) includes: a first branch (61) and a second branch (62); The first end of the first branch (61) is connected to the positive terminal of the first battery (1), the second end of the first branch (61) is connected to the first end of the first control sub-circuit (31), and a first switch (K1) is connected to the first branch (61). The first end of the second branch (62) is connected to the negative terminal of the first battery (1), the second end of the second branch (62) is connected to the generator (4), and a second switch (K2) is connected to the second branch (62). In the first driving mode, the first switch (K1) and the second switch (K2) are configured to be turned on so that the first battery (1) is connected to the first control sub-circuit (31).

4. The motor drive system (100) according to claim 3, characterized in that, The switching sub-circuit (30) further includes: a third branch (63) and a fourth branch (64); The first end of the third branch (63) is connected to the positive terminal of the second battery (2), the second end of the third branch (63) is connected to the first end of the fourth branch (64), and a third switch (K3) is connected to the third branch (63). The second end of the fourth branch (64) is connected to the first end of the first control sub-circuit (31), and a fourth switch (K4) is connected to the fourth branch (64); the negative terminal of the second battery (2) is connected to the generator (4); In the second driving mode, the third switch (K3) and the fourth switch (K4) are configured to be turned on so that the second battery (2) is connected to the first control sub-circuit (31).

5. The motor drive system (100) according to claim 4, characterized in that, The switching sub-circuit (30) further includes: a fifth branch (65); The first end of the fifth branch (65) is connected to the positive terminal of the second battery (2), the second end of the fifth branch (65) is connected to the positive terminal of the first battery (1), and a fifth switch (K5) is connected to the fifth branch (65). In the third driving mode, the fifth switch (K5) and the fourth switch (K4) are configured to be turned on so that the positive terminal of the first battery (1) is connected to the positive terminal of the second battery (2), and the negative terminal of the first battery (1) is connected to the first control sub-circuit (31).

6. The motor drive system (100) according to claim 5, characterized in that, A diode (D1) is also connected to the fifth branch (65). The positive terminal of the diode (D1) is connected to the fifth switch (K5), and the negative terminal of the diode (D1) is connected to the positive terminal of the first battery (1).

7. The motor drive system (100) according to claim 5, characterized in that, The second end of the third branch (63) is also connected to the negative terminal of the first battery (1); In the fourth driving mode, the third switch (K3) and the first switch (K1) are configured to be turned on so that the negative terminal of the first battery (1) is connected to the positive terminal of the second battery (2), and the positive terminal of the first battery (1) is connected to the first control sub-circuit (31).

8. The motor drive system (100) according to claim 3, characterized in that, The switching sub-circuit (30) further includes: a sixth branch (66) and a seventh branch (67); The first end of the sixth branch (66) is connected to the generator (4), the second end of the sixth branch (66) is connected to the drive motor (5), and a sixth switch (K6) is connected to the sixth branch (66). The first end of the seventh branch (67) is connected to the generator (4), the second end of the seventh branch (67) is connected to the second end of the second branch (62) and the negative terminal of the second battery (2), and a seventh switch (K7) is connected to the seventh branch (67). The sixth switch (K6) is configured to be turned on when the coil of the generator (4) is being charged, so that the generator (4) is connected to the negative terminal of the first battery (1) or to the negative terminal of the second battery (2). The seventh switch (K7) is configured to be turned on when the drive motor (5) is driven, so that the generator (4) is connected to the drive motor (5).

9. The motor drive system (100) according to claim 2, characterized in that, The switching sub-circuit (30) includes: the eighth branch (68), the ninth branch (69) and the tenth branch (70); The first end of the eighth branch (68) is connected to the positive terminal of the first battery (1), the second end of the eighth branch (68) is connected to the first end of the first control sub-circuit (31), and the eighth switch (K8) is connected to the eighth branch (68). The first end of the ninth branch (69) is connected to the negative terminal of the first battery (1), the second end of the ninth branch (69) is connected to the first end of the tenth branch (70), and a ninth switch (K9) is connected to the ninth branch (69). The second end of the tenth branch (70) is connected to the generator (4), and the tenth switch (K10) is connected to the tenth branch (70). In the first driving mode, the eighth switch (K8), the ninth switch (K9) and the tenth switch (K10) are configured to be turned on so that the first battery (1) is connected to the first control sub-circuit (31).

10. The motor drive system (100) according to claim 9, characterized in that, The switching sub-circuit (30) further includes: an eleventh branch (71) and a twelfth branch (72); The first end of the eleventh branch (71) is connected to the positive terminal of the second battery (2), the second end of the eleventh branch (71) is connected to the second end of the ninth branch (69), and the eleventh branch (71) is connected to the eleventh switch (K11). The first end of the twelfth branch (72) is connected to the first end of the ninth branch (69), the second end of the twelfth branch (72) is connected to the first end of the first control sub-circuit (31), and the twelfth switch (K12) is connected to the twelfth branch (72); the negative terminal of the second battery (2) is connected to the generator (4); In the second driving mode, the ninth switch (K9), the eleventh switch (K11), and the twelfth switch (K12) are configured to be turned on so that the second battery (2) is connected to the first control sub-circuit (31).

11. The motor drive system (100) according to claim 10, characterized in that, The switching sub-circuit (30) also includes: the thirteenth branch (73); The first end of the thirteenth branch (73) is connected to the second end of the eleventh branch (71), the second end of the thirteenth branch (73) is connected to the positive terminal of the first battery (1), and the thirteenth switch (K13) is connected to the thirteenth branch (73). In the third driving mode, the eleventh switch (K11), the twelfth switch (K12) and the thirteenth switch (K13) are configured to be turned on so that the positive terminal of the first battery (1) is connected to the positive terminal of the second battery (2) and the negative terminal of the first battery (1) is connected to the first control sub-circuit (31).

12. The motor drive system (100) according to claim 11, characterized in that, In the fourth driving mode, the eighth switch (K8), the ninth switch (K9) and the eleventh switch (K11) are configured to be turned on so that the negative terminal of the first battery (1) is connected to the positive terminal of the second battery (2) and the positive terminal of the first battery (1) is connected to the first control sub-circuit (31).

13. The motor drive system (100) according to claim 2, characterized in that, The switching sub-circuit (30) includes: the fourteenth branch (74) and the fifteenth branch (75); The first end of the fourteenth branch (74) is connected to the positive terminal of the first battery (1), the second end of the fourteenth branch (74) is connected to the first end of the first control sub-circuit (31), and the fourteenth switch (K14) is connected to the fourteenth branch (74). The first end of the fifteenth branch (75) is connected to the negative terminal of the first battery (1), the second end of the fifteenth branch (75) is connected to the second end of the first control sub-circuit (31), and the fifteenth switch (K15) is connected to the fifteenth branch (75). In the first driving mode, the fourteenth switch (K14) and the fifteenth switch (K15) are configured to be turned on so that the first battery (1) is connected to the first control sub-circuit (31).

14. The motor drive system (100) according to claim 13, characterized in that, The switching sub-circuit (30) also includes: the sixteenth branch (76); The first end of the sixteenth branch (76) is connected to the positive terminal of the second battery (2), the second end of the sixteenth branch (76) is connected to the second end of the fourteenth branch (74), and the sixteenth switch (K16) is connected to the sixteenth branch (76). In the second driving mode, the fourteenth switch (K14) and the sixteenth switch (K16) are configured to be turned on so that the second battery (2) is connected to the first control sub-circuit (31).

15. The motor drive system (100) according to claim 14, characterized in that, The switching sub-circuit (30) also includes: the seventeenth branch (77); The first end of the seventeenth branch (77) is connected to the negative terminal of the first battery (1), the second end of the seventeenth branch (77) is connected to the second end of the fourteenth branch (74), and the seventeenth switch (K17) is connected to the seventeenth branch (77). In the third driving mode, the sixteenth switch (K16) and the seventeenth switch (K17) are configured to be turned on so that the positive terminal of the first battery (1) is connected to the positive terminal of the second battery (2) and the negative terminal of the first battery (1) is connected to the first control sub-circuit (31).

16. The motor drive system (100) according to claim 2, characterized in that, The first control sub-circuit (31) includes: a first bridge arm (81); The first end of the first bridge arm (81) is the first end of the first control sub-circuit (31), and the second end of the first bridge arm (81) is the second end of the first control sub-circuit (31); the third end of the first bridge arm (81) is connected to the coil of the generator (4). The common end of the upper and lower arms of the first bridge arm (81) is the third end of the first bridge arm (81).

17. The motor drive system (100) according to claim 16, characterized in that, The first bridge arm (81) includes: a first switch sub-circuit (811) and a second switch sub-circuit (812); The upper arm of the first bridge arm (81) is provided with a first switch sub-circuit (811), and the lower arm of the first bridge arm (81) is provided with a second switch sub-circuit (812). When at least one of the first battery (1) and the second battery (2), and the generator (4) jointly boost the drive motor (5), the first switch sub-circuit (811) is turned on and the second switch sub-circuit (812) is turned off.

18. The motor drive system (100) according to any one of claims 2 to 17, characterized in that, The switching circuit (3) further includes: a second control sub-circuit (32); The first end of the second control sub-circuit (32) is connected to the first end of the first control sub-circuit (31), the first end of the second control sub-circuit (32) is connected to the second end of the first control sub-circuit (31), and the third end of the second control sub-circuit (32) is connected to the drive motor (5).

19. The motor drive system (100) according to claim 18, characterized in that, The second control sub-circuit (32) includes: a second bridge arm (82); The first end of the second bridge arm (82) is the first end of the second control sub-circuit (32), and the second end of the second bridge arm (82) is the second end of the second control sub-circuit (32); the third end of the second bridge arm (82) is connected to the coil of the drive motor (5); The common end of the upper and lower bridge arms of the second bridge arm (82) is the third end of the second bridge arm (82).

20. The motor drive system (100) according to claim 19, characterized in that, The second bridge arm (82) includes: a third switch sub-circuit (821) and a fourth switch sub-circuit (822); The upper arm of the second bridge arm (82) is provided with a third switch sub-circuit (821), and the lower arm of the second bridge arm (82) is provided with a fourth switch sub-circuit (822). When the third switch sub-circuit (821) is turned on, the fourth switch sub-circuit (822) is turned off; or, when the third switch sub-circuit (821) is turned off, the fourth switch sub-circuit (822) is turned on.

21. The motor drive system (100) according to claim 1, characterized in that, The switching circuit (3) includes: a third control sub-circuit (33) and a fourth control sub-circuit (34); The first end of the third control sub-circuit (33) is connected to the positive terminal of the first battery (1) and also to the negative terminal of the second battery (2); the second end of the third control sub-circuit (33) is connected to the negative terminal of the first battery (1), and the third end of the third control sub-circuit (33) is connected to the generator (4). The first end of the fourth control sub-circuit (34) is connected to the positive terminal of the second battery (2), the second end of the fourth control sub-circuit (34) is connected to the negative terminal of the second battery (2), and the third end of the fourth control sub-circuit (34) is connected to the generator (4). The third control sub-circuit (33) includes: a third bridge arm (83); the fourth control sub-circuit (34) includes: a fourth bridge arm (84); The first end of the third bridge arm (83) is the first end of the third control sub-circuit (33), the second end of the third bridge arm (83) is the second end of the third control sub-circuit (33), and the third end of the third bridge arm (83) is the third end of the third control sub-circuit (33). Wherein, the common connection end of the upper bridge arm and the lower bridge arm of the third bridge arm (83) is the third end of the third bridge arm (83); The first end of the fourth bridge arm (84) is the first end of the fourth control sub-circuit (34), the second end of the fourth bridge arm (84) is the second end of the fourth control sub-circuit (34), and the third end of the fourth bridge arm (84) is the third end of the fourth control sub-circuit (34). The common connection end of the upper and lower bridge arms of the fourth bridge arm (84) is the third end of the fourth bridge arm (84).

22. The motor drive system (100) according to claim 21, characterized in that, The third bridge arm (83) includes: a fifth switch sub-circuit (831) and a sixth switch sub-circuit (832); The upper arm of the third bridge arm (83) is provided with a fifth switch sub-circuit (831), and the lower arm of the third bridge arm (83) is provided with a sixth switch sub-circuit (832).

23. The motor drive system (100) according to claim 22, characterized in that, The fourth bridge arm (84) includes: a seventh switch sub-circuit (841) and an eighth switch sub-circuit (842); The upper arm of the fourth bridge arm (84) is provided with a seventh switch sub-circuit (841), and the lower arm of the fourth bridge arm (84) is provided with an eighth switch sub-circuit (842).

24. The motor drive system (100) according to claim 23, characterized in that, In the first driving mode, the fifth switch sub-circuit (831) and the sixth switch sub-circuit (832) are configured to be alternately turned on so that the first battery (1) is connected to the generator (4).

25. The motor drive system (100) according to claim 23, characterized in that, In the second driving mode, the seventh switch sub-circuit (841) and the eighth switch sub-circuit (842) are configured to be alternately turned on so that the second battery (2) is connected to the generator (4).

26. The motor drive system (100) according to claim 23, characterized in that, In the fourth driving mode, the sixth switch sub-circuit (832) and the seventh switch sub-circuit (841) are configured to be alternately turned on so that the positive terminal of the first battery (1) is connected to the negative terminal of the second battery (2), and the first battery (1), the second battery (2) are connected to the generator (4).

27. The motor drive system (100) according to claim 1, characterized in that, The switching circuit (3) includes: a first switch group (91), a second switch group (92) and a third switch group (93); The first end of the first switch group (91) is connected to the positive terminal of the first battery (1), and the second end of the first switch group (91) is connected to the generator (4); The first end of the second switch group (92) is connected to the positive terminal of the second battery (2), the second end of the second switch group (92) is connected to the generator (4), and is also connected to the second end of the first switch group (91) and the second end of the third switch group (93); The first end of the third switch group (93) is connected to the negative terminal of the first battery (1) and also to the negative terminal of the second battery (2).

28. The motor drive system (100) according to claim 27, characterized in that, In the first drive mode, the first switch group (91) and the third switch group (93) are configured to be alternately turned on so that the first battery (1) is connected to the generator (4).

29. The motor drive system (100) according to claim 27, characterized in that, In the second drive mode, the second switch group (92) and the third switch group (93) are configured to be alternately turned on so that the second battery (2) is connected to the generator (4).

30. The motor drive system (100) according to claim 27, characterized in that, In the fourth drive mode, the first switch group (91) and the second switch group (92) are configured to be alternately turned on so that the positive terminal of the first battery (1) is connected to the negative terminal of the second battery (2), and the first battery (1), the second battery (2) are connected to the generator (4).

31. A motor drive system (100), characterized in that, include: The first battery (1), the second battery (2), the switching circuit (3), and the drive motor (5); The first battery (1) and the second battery (2) are both connected to the switching circuit (3), and the switching circuit (3) is also connected to the drive motor (5); The switching circuit (3) is used to connect at least one of the first battery (1) and the second battery (2) to the switching circuit (3); at least one of the first battery (1) and the second battery (2) supplies power to the drive motor (5); When at least one of the first battery (1) and the second battery (2) provides boost drive for the drive motor (5), the drive mode includes: The fifth driving mode is a mode in which the first battery (1) boosts the driving motor (5); The sixth driving mode is a mode in which the second battery (2) boosts the driving motor (5); The seventh driving mode is a mode in which the voltage difference between the first battery (1) and the second battery (2) drives the drive motor (5); The eighth driving mode is a mode in which the voltage of the first battery (1) and the second battery (2) is boosted to drive the drive motor (5); The rated voltage of the first battery (1) is less than the rated voltage of the second battery (2); the driving voltage provided to the drive motor (5) in the fifth driving mode, the sixth driving mode, the seventh driving mode and the eighth driving mode are different.

32. A control system (200), characterized in that, include: The motor drive system (100) as described in any one of claims 1 to 30; Alternatively, the motor drive system (100) as described in claim 31. The controller (210) is used to control the operation of the switching circuit (3) in the motor drive system (100).

33. A vehicle (300), characterized in that, include: The motor drive system (100) as described in any one of claims 1 to 30 or the motor drive system (100) as described in claim 31, and / or the control system (200) as described in claim 32.

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