Motor controller, electric drive system and vehicle
By designing voltage divider components and power components, and combining resonant circuits and soft-switching modes, the problems of complex structure and high cost of existing motor controllers are solved, achieving high efficiency, low cost and high efficiency of the motor controller.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOMI EV TECH CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-05
AI Technical Summary
Existing motor controllers are complex in structure and expensive, making it difficult to effectively reduce motor losses and improve efficiency.
The design employs voltage divider components and power components. The voltage divider components divide the battery level into multiple levels, and the level is loaded to the output terminal by selectively turning on the switching unit to realize the driving of multi-phase AC power. The design combines resonant circuit and soft switching mode to reduce switching losses.
The resulting motor controller is simple in structure, easy to manufacture, and low in cost, improving motor efficiency and reducing losses, especially under the 800V platform.
Smart Images
Figure CN224205006U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of vehicle technology, and more specifically, to a motor controller, an electric drive system, and a vehicle. Background Technology
[0002] In electric vehicles, the motor operates under the control of a motor controller to achieve functions such as starting, stopping, steering, and speed regulation.
[0003] The structure of existing motor controllers needs improvement.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0005] This disclosure provides a motor controller, an electric drive system, and a vehicle, which have a simple structure and low cost.
[0006] According to a first aspect of this disclosure, a motor controller is provided, comprising:
[0007] The voltage divider assembly includes multiple voltage divider capacitors connected in series;
[0008] A power assembly includes multiple power modules, each of which is connected to a voltage divider assembly via a connection portion. Each power module has a power circuit with a first input terminal, a second input terminal, a third input terminal, and an output terminal. The power circuit includes a first switching unit, a second switching unit, a third switching unit, and a fourth switching unit. The first terminal of the first switching unit is electrically connected to the first input terminal, and the second terminal of the first switching unit is electrically connected to the output terminal. The first switching unit is turned on in response to a first control signal. The first terminal of the second switching unit is electrically connected to the second input terminal, and the second terminal of the second switching unit is electrically connected to the second terminal of the third switching unit. The second switching unit is turned on in response to a second control signal. The first terminal of the third switching unit is electrically connected to the output terminal, and the third switching unit is turned on in response to a third control signal. The first terminal of the fourth switching unit is electrically connected to the third input terminal, and the second terminal of the fourth switching unit is electrically connected to the output terminal. The fourth switching unit is turned on in response to a fourth control signal. The output terminal is connected to a motor via a conductive portion.
[0009] In one embodiment of this disclosure, the motor has three different terminals, the number of power modules is three, the first input terminals of the power circuits of the three power modules are electrically connected to each other, the second input terminals of the power circuits of the three power modules are electrically connected to each other, the third input terminals of the power circuits of the three power modules are electrically connected to each other, the output terminal of the power circuit of one power module is electrically connected to one of the terminals, and the output terminals of the power circuits of the three power modules are respectively electrically connected to different terminals.
[0010] In one embodiment of this disclosure, the voltage divider assembly includes a first voltage divider capacitor and a second voltage divider capacitor. The first input terminal is electrically connected to the first terminal of the first voltage divider capacitor, and the second terminal of the first voltage divider capacitor, the first terminal of the second voltage divider capacitor, and the second input terminal are electrically connected to each other. The second terminal of the second voltage divider capacitor is electrically connected to the third input terminal.
[0011] In one embodiment of this disclosure, the power circuit further includes a first power capacitor, a second power capacitor, and an inductor.
[0012] Wherein, one end of the first power capacitor is electrically connected to the first input terminal, and the other end is electrically connected to the output terminal;
[0013] One end of the second power capacitor is electrically connected to the third input terminal, and the other end is electrically connected to the output terminal;
[0014] One end of the inductor is electrically connected to the second input terminal, and the other end is electrically connected to the first pole of the second switching unit.
[0015] The first switching unit, the second switching unit, the third switching unit, the fourth switching unit, the first power capacitor, and the second power capacitor are packaged in the same power module.
[0016] In one embodiment of this disclosure, the inductor includes a magnetic ring, which is sleeved on the connection portion connected to the second input terminal.
[0017] In one embodiment of this disclosure, the first power capacitor and the second power capacitor are silicon wafer capacitors.
[0018] In one embodiment of this disclosure, the connecting portion includes a first connecting segment and a second connecting segment, the first connecting segment being connected to the voltage divider assembly, the second connecting segment being connected to the power module, and the first connecting segment being connected to the second connecting segment.
[0019] In one embodiment of this disclosure, the first connecting segment has a first connecting hole, the second connecting segment has a second connecting hole, and the first connecting hole and the second connecting hole have an overlapping area.
[0020] In one embodiment of this disclosure, the motor controller further includes a base plate with a heat exchange channel, and the power component is disposed on the base plate.
[0021] According to a second aspect of this disclosure, an electric drive system is also provided, including a battery, a motor, a drive board, and a motor controller as described in any of the above embodiments;
[0022] The battery is connected to the motor controller and is used to provide DC power to the motor controller.
[0023] The drive board is connected to the motor controller and is used to provide the motor controller with a first control signal, a second control signal, a third control signal, and a fourth control signal;
[0024] The motor is connected to the motor controller and is used to operate under the control of the motor controller.
[0025] According to a third aspect of this disclosure, a vehicle is also provided, including the electric drive system described above.
[0026] A battery is connected to a voltage divider assembly to provide power to the motor controller. The voltage divider assembly divides the battery voltage into multiple levels (e.g., high, zero, and low). These divided levels (e.g., high, zero, and low) can be applied to multiple power modules of a power unit via a connection. Within the power circuit of the same power module, and at the same time, the first to fourth switching units are selectively activated, allowing the multiple divided levels to be applied to the output terminal. This provides the motor with multiple AC currents of different phases (e.g., two-phase AC, three-phase AC, etc.) to drive the motor. The motor controller provided in this disclosure has a simple structure, is easy to manufacture, and has low cost.
[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0029] Figure 1 This is a structural diagram of a motor controller in one embodiment of the present disclosure, intended to illustrate a soft-switching mode.
[0030] Figure 2 The present invention provides an equivalent circuit diagram of a motor controller in one embodiment of the present disclosure, intended to illustrate a soft-switching mode.
[0031] Figure 3 for Figure 2 The partial equivalent circuit diagram is intended to illustrate the equivalent circuit of a power module.
[0032] Figure 4 This is another structural diagram of a motor controller in one embodiment of the present disclosure, intended to illustrate a hard-switching mode.
[0033] Figure 5 The following is another equivalent circuit diagram of the motor controller in one embodiment of this disclosure, intended to illustrate a hard-switching mode.
[0034] Figure 6 for Figure 5 The partial equivalent circuit diagram in the figure is intended to represent the equivalent circuit of a power module.
[0035] Explanation of reference numerals in the attached figures:
[0036] 1. Voltage divider assembly; 11. First voltage divider capacitor; 12. Second voltage divider capacitor; 13. First metal part; 14. Second metal part; 2. Power assembly; 21. Power module; 211. Connecting part; 212. Conductive part; IN1. First input terminal; IN2. Second input terminal; IN3. Third input terminal; OUT. Output terminal; SW1. First switching unit; SW2. Second switching unit; SW3. Third switching unit; SW4. Fourth switching unit; C1. First power capacitor; C2. Second power capacitor; Lr. Inductor; 3. Base plate. Detailed Implementation
[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0038] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.
[0039] This disclosure provides a motor controller for converting direct current (DC) to alternating current (AC) to control the operation of a motor. See also... Figure 1 , Figure 2 , Figure 4 , Figure 5 The motor controller includes a voltage divider assembly 1 and a power assembly 2. The voltage divider assembly 1 includes multiple voltage divider capacitors connected in series. The power assembly 2 includes multiple power modules 21, which are connected to the voltage divider assembly 1 via connection parts 211. Each power module 21 has a power circuit with a first input terminal IN1, a second input terminal IN2, a third input terminal IN3, and an output terminal OUT. The power circuit includes a first switching unit SW1, a second switching unit SW2, a third switching unit SW3, and a fourth switching unit SW4. Specifically, the first pole of the first switching unit SW1 is electrically connected to the first input terminal IN1, and the second pole of the first switching unit SW1 is electrically connected to the output terminal OUT. The first switching unit SW1 is turned on in response to a first control signal. The first pole of the second switching unit SW2 is electrically connected to the second input terminal IN2, and the second pole of the second switching unit SW2 is electrically connected to the second pole of the third switching unit SW3. The second switching unit SW2 is turned on in response to a second control signal. The first pole of the third switching unit SW3 is electrically connected to the output terminal OUT. The third switching unit SW3 is turned on in response to a third control signal. The first pole of the fourth switching unit SW4 is electrically connected to the third input terminal IN3, and the second pole of the fourth switching unit SW4 is electrically connected to the output terminal OUT. The fourth switching unit SW4 is turned on in response to a fourth control signal. The output terminal OUT is connected to the motor through the conductive part 212.
[0040] In embodiments of this disclosure, a battery can be connected to a voltage divider assembly 1 to provide power to the motor controller. The voltage divider assembly 1 can divide the battery voltage level into multiple levels (e.g., high level, zero level, and low level). The voltage levels after voltage division by the voltage divider assembly 1 (e.g., high level, zero level, and low level) can be applied to multiple power modules 21 of the power assembly 2 through the connection part 211. In the power circuit of the same power module 21, and at the same time, the first switching unit SW1 to the fourth switching unit SW4 will be selectively turned on, so that the multiple voltage levels after voltage division can be applied to the output terminal OUT, so as to provide the motor with multiple AC currents of different phases (e.g., two-phase AC current, three-phase AC current, etc.), thereby driving the motor to work. The motor controller provided by this disclosure has a simple structure, is easy to manufacture, and has low cost.
[0041] In one embodiment of this disclosure, at least one of the first switching unit SW1, the second switching unit SW2, the third switching unit SW3, and the fourth switching unit SW4 may be one of an insulated gate bipolar transistor (IGBT), a metal oxide semiconductor field-effect transistor (MOSFET), or a high electron mobility transistor (HEMT).
[0042] In one embodiment of this disclosure, when applied to an 800V platform, the first switching unit SW1 and the fourth switching unit SW4 can be selected as 1200V metal-oxide-semiconductor field-effect transistors, and the second switching unit SW2 and the third switching unit SW3 can be selected as 650V insulated-gate bipolar transistors, metal-oxide-semiconductor field-effect transistors, high electron mobility transistors, etc.
[0043] In one embodiment of this disclosure, the motor has three different terminals (e.g., the U, V, and W terminals of the motor). See also Figure 1 , Figure 2 , Figure 4 , Figure 5There are three power modules 21. The first input terminals IN1 of the power circuits of the three power modules 21 are electrically connected to each other. The second input terminals IN2 of the power circuits of the three power modules 21 are electrically connected to each other. The third input terminals IN3 of the power circuits of the three power modules 21 are electrically connected to each other. The output terminal OUT of the power circuit of one power module 21 is electrically connected to a terminal, and the output terminals OUT of the power circuits of the three power modules 21 are respectively electrically connected to different terminals. In this way, three-phase AC power can be provided to the motor to drive the motor, reduce the iron loss of the motor, and improve the efficiency of the motor.
[0044] In one embodiment of this disclosure, see Figure 2 , Figure 4 The voltage divider assembly 1 includes a first voltage divider capacitor 11 and a second voltage divider capacitor 12. The first input terminal IN1 is electrically connected to the first terminal of the first voltage divider capacitor 11. The second terminal of the first voltage divider capacitor 11, the first terminal of the second voltage divider capacitor 12, and the second input terminal IN2 are electrically connected to each other. The second terminal of the second voltage divider capacitor 12 is electrically connected to the third input terminal IN3. Thus, by connecting the first voltage divider capacitor 11 and the second voltage divider capacitor 12 in series, the battery voltage can be divided into three levels: high, zero, and low, to facilitate the conversion of DC power to AC power for the motor. For example, the high level value is a positive number and is half the battery voltage. The zero level value is 0. The low level value is a negative number and is half the battery voltage.
[0045] In one embodiment of this disclosure, see Figure 1 , Figure 2 , Figure 3 The power circuit also includes a first power capacitor C1, a second power capacitor C2, and an inductor Lr. One end of the first power capacitor C1 is electrically connected to the first input terminal IN1, and the other end is electrically connected to the output terminal OUT. One end of the second power capacitor C2 is electrically connected to the third input terminal IN3, and the other end is electrically connected to the output terminal OUT. One end of the inductor Lr is electrically connected to the second input terminal IN2, and the other end is electrically connected to the first pole of the second switching unit SW2. Thus, in the power circuit of the same power module 21, a resonant circuit is formed by the first power capacitor C1, the second power capacitor C2, and the inductor Lr. This enables the first switching unit SW1 and the fourth switching unit SW4 to achieve zero-voltage turn-on, and also enables the second switching unit SW2 and the third switching unit SW3 to achieve zero-current turn-off (i.e., soft-switching mode). This reduces the switching losses of the first switching unit SW1 to the fourth switching unit SW4, thereby reducing the switching losses of the motor controller and improving the efficiency of the motor controller.
[0046] In one embodiment of this disclosure, the first switching unit SW1, the second switching unit SW2, the third switching unit SW3, the fourth switching unit SW4, the first power capacitor C1, and the second power capacitor C2 can be packaged in the same power module 21. For example, the power module 21 has a package housing, and the first switching unit SW1, the second switching unit SW2, the third switching unit SW3, the fourth switching unit SW4, the first power capacitor C1, and the second power capacitor C2 are all located inside the package housing, which is beneficial for the modularization and unitization of the power module 21.
[0047] In one embodiment of this disclosure, see Figure 1 , Figure 3 The inductor element Lr includes a magnetic ring, which is sleeved on the connection portion 211 connected to the second input terminal IN2. In this way, the inductor element Lr is formed by the magnetic ring sleeved on the connection portion 211 connected to the second input terminal IN2, so that the magnetic ring can form a resonant circuit with the first power capacitor C1 and the second power capacitor C2.
[0048] In one embodiment of this disclosure, the first power capacitor C1 and the second power capacitor C2 are silicon chip capacitors. This is beneficial for improving the stability of the first power capacitor C1 and the second power capacitor C2, reducing the probability of distortion and leakage current of the first power capacitor C1 and the second power capacitor C2, and reducing the cost of the motor controller.
[0049] In one embodiment of this disclosure, the connection portion 211 includes a first connection segment and a second connection segment. The first connection segment is connected to the voltage divider assembly 1, and the second connection segment is connected to the power module 21. For example, a power module 21 is connected to the voltage divider assembly 1 via three connection portions 211, each of which has a connected first connection segment and a second connection segment. Specifically, the first end of the first voltage divider capacitor 11 is electrically connected to the first connection segment of the first connection portion 211, the second end of the first voltage divider capacitor 11 is electrically connected to the first connection segment of the second connection portion 211, and the second end of the second voltage divider capacitor 12 is electrically connected to the first connection segment of the third connection portion 211. The first input terminal IN1 is electrically connected to the second connection segment of the first connection portion 211, the second input terminal IN2 is electrically connected to the second connection segment of the second connection portion 211, and the third input terminal IN3 is electrically connected to the second connection segment of the third connection portion 211. A magnetic ring is fitted onto the second connection segment of the second connection portion 211. This facilitates the connection between the voltage divider assembly 1 and the power module 2.
[0050] In one embodiment of this disclosure, the first connecting segment has a first connecting hole, the second connecting segment has a second connecting hole, and the first connecting hole and the second connecting hole have an overlapping area. The first connecting hole and the second connecting hole can be connected by welding, snap-fitting, or bolting.
[0051] In one embodiment of this disclosure, see Figure 1 , Figure 4 The motor controller also includes a base plate 3, on which a heat exchange channel is provided. The heat exchange channel contains a heat exchange medium, which can be a fluid such as coolant or cooling gas. The power module 2 is mounted on the base plate 3. In this way, multiple power modules 21 are integrated onto a single base plate 3, improving the modularity of the motor controller. Furthermore, the heat exchange medium in the heat exchange channel of the base plate 3 allows for heat exchange of the components in the power module 2, extending the service life of the motor controller.
[0052] In one embodiment of this disclosure, the conductive part 212 is provided with a third connection hole, and correspondingly, the wiring terminal of the motor is provided with a wiring part, and the wiring part is provided with a fourth connection hole. The third connection hole and the fourth connection hole overlap so as to facilitate the electrical connection of the power module 21 to the motor through the conductive part 212 and the wiring part.
[0053] In one embodiment of this disclosure, see Figure 1 , Figure 4 The voltage divider assembly 1 has a first metal part 13 and a second metal part 14 on the side away from the power assembly 2. The first metal part 13 is connected to the first end of the first voltage divider capacitor 11 and is used to connect to the positive terminal of the battery. The second metal part 14 is connected to the second end of the second voltage divider capacitor 12 and is used to connect to the negative terminal of the battery. The first metal part 13 and the second metal part 14 are spaced apart along a first direction and extend along a second direction.
[0054] In one embodiment of this disclosure, see Figure 1 , Figure 4 The power module 21 consists of three units, which are spaced apart along a first direction on the base plate 3. Nine connecting parts 211 are also spaced apart along the first direction and extend along a second direction. The base plate 3 extends along the first direction. Three conductive parts 212 are also spaced apart along the first direction and extend along the second direction.
[0055] In one embodiment of this disclosure, the connecting part 211, the conductive part 212, the wiring part, the first metal part 13, and the second metal part 14 can all be copper busbars to improve conductivity.
[0056] In one embodiment of this disclosure, in a first example, see [link to first example]. Figures 1-3When it is necessary to improve the efficiency of the motor controller, a first power capacitor C1 and a second power capacitor C2 can be mounted on the power module 21, and a magnetic ring can be fitted on the second connecting section of the connecting part 211 connected to the second input terminal IN2. The first power capacitor C1, the second power capacitor C2, and the magnetic ring form a resonant circuit, which realizes the zero-voltage turn-on function of the first switching unit SW1 and the fourth switching unit SW4, and also realizes the zero-current turn-off function of the second switching unit SW2 and the third switching unit SW3, that is, the soft switching mode, which is beneficial to reduce switching losses and improve the efficiency of the motor controller.
[0057] In the second example, see Figures 4-6 When it is necessary to increase the loss of the motor, the first power capacitor C1 and the second power capacitor C2 can be omitted from the power module 21, and a magnetic ring can be omitted from the second connection section of the connection part 211 connected to the second input terminal IN2. This allows the motor controller to have three levels (high level, zero level, and low level) to reduce the high-frequency ripple current flowing into the motor, thereby reducing the iron loss of the motor and improving the efficiency of the motor.
[0058] In the embodiments of this disclosure, since the difference between the motor controller of the first example and the motor controller of the second example lies only in the first power capacitor C1, the second power capacitor C2 and the inductor Lr, the two types of motor controllers can be switched on the same basis according to the requirements, which has high flexibility and economy.
[0059] In one embodiment of this disclosure, the voltage level at the first terminal of the first voltage divider capacitor 11 is high, the voltage levels at the second terminals of the first voltage divider capacitor 11 and the first terminal of the second voltage divider capacitor 12 are zero, and the voltage level at the second terminal of the second voltage divider capacitor 12 is low. That is, the voltage level at the first input terminal IN1 is high, the voltage level at the second input terminal IN2 is zero, and the voltage level at the third input terminal IN3 is low. Only the first switching unit SW1 can be turned on to apply a high voltage level to the output terminal OUT. Only the second switching units SW2 and the third switching unit SW3 can be turned on to apply a zero voltage level to the output terminal OUT. Only the fourth switching unit SW4 can be turned on to apply a low voltage level to the output terminal OUT.
[0060] This disclosure also provides an electric drive system, including a battery, a motor, a drive board, and a motor controller as described in any of the above embodiments. The specific structure and beneficial effects of the motor controller can be found in the above-described display device embodiments, and will not be detailed here. The battery is electrically connected to the motor controller and provides DC power to the motor controller. The battery can be a prismatic battery or a blade battery. The battery has a positive terminal and a negative terminal. The positive terminal can be electrically connected to the first terminal of the first voltage-dividing capacitor 11 of the motor controller, and the negative terminal can be electrically connected to the second terminal of the second voltage-dividing capacitor 12 of the motor controller. This allows for a high level to be provided to the first input terminal IN1 of the motor controller's power circuit, a zero level to the second input terminal IN2 of the motor controller's power circuit, and a low level to the third input terminal IN3 of the motor controller's power circuit.
[0061] The drive board is connected to the motor controller and is used to provide the motor controller with a first control signal, a second control signal, a third control signal, and a fourth control signal. The drive board may contain a drive circuit.
[0062] The motor is connected to a motor controller and is used to operate under the control of the motor controller; the motor has multiple terminals, and the output terminal OUT of the power circuit of the motor controller is electrically connected to one of the terminals.
[0063] This disclosure also provides a vehicle including the electric drive system described in any of the above embodiments. The specific structure and beneficial effects of the electric drive system can be referred to the embodiments of the display device described above, and will not be detailed here. The vehicle can be a pure electric vehicle, a hybrid electric vehicle, or the like.
[0064] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.
Claims
1. A motor controller, characterized in that, include: Voltage divider assembly (1), comprising multiple voltage divider capacitors connected in series; The power component (2) includes multiple power modules (21), which are respectively connected to the voltage divider component (1) via a connection part (211). Each power module (21) is provided with a power circuit, which has a first input terminal (IN1), a second input terminal (IN2), a third input terminal (IN3), and an output terminal (OUT). The power circuit includes a first switching unit (SW1), a second switching unit (SW2), a third switching unit (SW3), and a fourth switching unit (SW4). The first pole of the first switching unit (SW1) is electrically connected to the first input terminal (IN1), and the second pole of the first switching unit (SW1) is electrically connected to the output terminal (OUT). The first switching unit (SW1) is turned on in response to a first control signal. The first pole of the second switching unit (SW2) is electrically connected to the second input terminal (IN2), and the second pole of the second switching unit (SW2) is electrically connected to the second pole of the third switching unit (SW3). The second switching unit (SW2) is turned on in response to a second control signal. The first pole of the third switching unit (SW3) is electrically connected to the output terminal (OUT), and the third switching unit (SW3) is turned on in response to a third control signal. The first pole of the fourth switching unit (SW4) is electrically connected to the third input terminal (IN3), and the second pole of the fourth switching unit (SW4) is electrically connected to the output terminal (OUT). The fourth switching unit (SW4) is turned on in response to a fourth control signal, and the output terminal (OUT) is connected to the motor through a conductive part (212).
2. The motor controller according to claim 1, characterized in that, The motor has three different terminals. There are three power modules (21). The first input terminals (IN1) of the power circuits of the three power modules (21) are electrically connected to each other. The second input terminals (IN2) of the power circuits of the three power modules (21) are electrically connected to each other. The third input terminals (IN3) of the power circuits of the three power modules (21) are electrically connected to each other. The output terminal (OUT) of the power circuit of one power module (21) is electrically connected to one of the terminals. The output terminals (OUT) of the power circuits of the three power modules (21) are electrically connected to different terminals respectively.
3. The motor controller according to claim 2, characterized in that, The voltage divider assembly (1) includes a first voltage divider capacitor (11) and a second voltage divider capacitor (12). The first input terminal (IN1) is electrically connected to the first terminal of the first voltage divider capacitor (11). The second terminal of the first voltage divider capacitor (11), the first terminal of the second voltage divider capacitor (12), and the second input terminal (IN2) are electrically connected to each other. The second terminal of the second voltage divider capacitor (12) is electrically connected to the third input terminal (IN3).
4. The motor controller according to claim 1, characterized in that, The power circuit also includes a first power capacitor (C1), a second power capacitor (C2), and an inductor (Lr); Wherein, one end of the first power capacitor (C1) is electrically connected to the first input terminal (IN1), and the other end is electrically connected to the output terminal (OUT); One end of the second power capacitor (C2) is electrically connected to the third input terminal (IN3), and the other end is electrically connected to the output terminal (OUT); One end of the inductor (Lr) is electrically connected to the second input terminal (IN2), and the other end is electrically connected to the first pole of the second switching unit (SW2); The first switching unit (SW1), the second switching unit (SW2), the third switching unit (SW3), the fourth switching unit (SW4), the first power capacitor (C1), and the second power capacitor (C2) are packaged in the same power module (21).
5. The motor controller according to claim 4, characterized in that, The inductor (Lr) includes a magnetic ring, which is sleeved on the connection portion (211) connected to the second input terminal (IN2).
6. The motor controller according to claim 4, characterized in that, The first power capacitor (C1) and the second power capacitor (C2) are silicon wafer capacitors.
7. The motor controller according to claim 1, characterized in that, The connecting part (211) includes a first connecting segment and a second connecting segment. The first connecting segment is connected to the voltage divider assembly (1), and the second connecting segment is connected to the power module (21). The first connecting segment is connected to the second connecting segment.
8. The motor controller according to claim 7, characterized in that, The first connecting segment has a first connecting hole, the second connecting segment has a second connecting hole, and the first connecting hole and the second connecting hole have an overlapping area.
9. The motor controller according to any one of claims 1 to 8, characterized in that, The motor controller also includes a base plate (3), on which a heat exchange channel is provided, and the power component (2) is located on the base plate (3).
10. An electric drive system, characterized in that, Includes a battery, a motor, a drive board, and a motor controller as described in any one of claims 1 to 9; The battery is connected to the motor controller and is used to provide DC power to the motor controller. The drive board is connected to the motor controller and is used to provide the motor controller with a first control signal, a second control signal, a third control signal, and a fourth control signal; The motor is connected to the motor controller and is used to operate under the control of the motor controller.
11. A vehicle, characterized in that, Includes the electric drive system as described in claim 10.