Electric drive system controller, control method and electric vehicle

Abstract

The invention provides an electric driving system controller, a control method and an electric vehicle, and relates to the technical field of electric driving. The electric drive system controller comprises an inversion assembly, a motor winding assembly and a bus mechanism. The motor winding assembly comprises a plurality of motor sub-winding mechanisms, the inversion assembly comprises a plurality of inversion units, each inversion unit is connected with the corresponding motor sub-winding mechanism, the input end of each inversion unit is connected with the bus mechanism, and the output end of each inversion unit is connected with the corresponding motor sub-winding mechanism. The output ends of the inversion units are connected with the corresponding motor sub-winding mechanisms, and motor inversion control and preset current output to the motor sub-winding mechanisms are executed through the inversion units. The electric drive system controller can realize the technical effects of compact structural layout, high efficiency and high reliability.

Description

Technical Field

[0001] The present application relates to the field of electric drive technology, and more specifically, to an electric drive system controller, a control method and an electric vehicle. Background Art

[0002] With the continuous rapid growth of electric vehicle ownership and the accelerated pace of green and low-carbon transformation and upgrading of the power grid, electric vehicles with energy and power systems as the core will evolve towards the technical trend of high voltage, large capacity, high power, integrated and efficient. At present, the electric drive system of new energy vehicles generally uses power semiconductors based on silicon-based IGBT and silicon carbide MOSFET, which are relatively mature in application, but have more ideal switching characteristics, with higher breakdown voltage, lower on-resistance, higher switching frequency and other characteristics, which can achieve higher energy conversion efficiency and system power density, and have broad application prospects in consumer electronics, industrial electronics and automotive electronics. However, the existing electric drive system controller on electric vehicles has a non-compact structural layout, making it difficult to achieve high efficiency and high reliability. Summary of the invention

[0003] The purpose of the present application is to provide an electric drive system controller, a control method and an electric vehicle, which can achieve a compact structural layout and achieve the technical effects of high efficiency and high reliability.

[0004] In a first aspect, the present application provides an electric drive system controller, including an inverter assembly, a motor winding assembly, and a busbar mechanism;

[0005] The motor winding assembly includes a plurality of motor sub-winding mechanisms, and the inverter assembly includes a plurality of inverter units, each of the inverter units being connected to the corresponding motor sub-winding mechanism, wherein the input end of the inverter unit is connected to the bus mechanism, and the output end of the inverter unit is connected to the corresponding motor sub-winding mechanism, and the motor inverter control is performed and a preset current is output to the motor sub-winding mechanism through the inverter unit.

[0006] In the above implementation process, the parallel combination of sub-windings and multiple inverter units makes the drive controller compact in structure and flexible in layout, which is convenient for modular and miniaturized design of power inverter units. In addition, the electric drive system controller can also achieve efficiency optimization under different load conditions through sector drive control, and the system control has high robustness, which improves the operation reliability. Moreover, the AC and DC charging functions are reused through multiple groups of inverter units, which enriches the system functions and reduces the system cost. Therefore, the electric drive system controller can achieve a compact structural layout and achieve the technical effect of high efficiency and high reliability.

[0007] Further, the motor sub-winding mechanism is configured to be annularly arranged, and a plurality of the motor sub-winding mechanisms are configured as a plurality of annular sectors, where each annular sector includes one of the motor sub-winding mechanisms and one or more corresponding inverter units.

[0008] In the above implementation process, by configuring the motor sub-winding mechanism to be annularly arranged, a plurality of motor sub-winding mechanisms can be configured as a plurality of annular sectors, and one or more inverter units are correspondingly connected to each annular sector; thus, the electric drive system controller realizes the optimization of efficiency under different load conditions through the sector-driven control method, has high system control robustness, and improves the operation reliability.

[0009] Further, the inverter unit includes multiple groups of wide-bandgap semiconductor power tubes and a plurality of input capacitors, and the input capacitors are respectively connected to the multiple groups of wide-bandgap semiconductor power tubes, where the multiple groups of wide-bandgap semiconductor power tubes are connected into a three-phase inverter circuit.

[0010] In the above implementation process, wide-bandgap semiconductor power tubes are used as power devices in the inverter unit. For example, gallium nitride power tubes can be used, so that the characteristics and advantages of gallium nitride in high frequency, high efficiency, miniaturization, and low power can be utilized; furthermore, through the parallel combination of sub-windings and multiple inverter units, the drive controller has a compact structure, flexible layout, and is convenient for the modular and miniaturized design of the power inverter unit.

[0011] Further, the inverter unit includes six groups of gallium nitride power tubes, where the six groups of gallium nitride power tubes are star-connected by sub-windings and connected into a three-phase full-bridge inverter circuit.

[0012] In the above implementation process, gallium nitride power tubes are used as power devices in the inverter unit, and the characteristics and advantages of gallium nitride in high frequency, high efficiency, miniaturization, and low power can be utilized.

[0013] Further, the number of the multiple motor sub-winding mechanisms is the same as the number of the multiple inverter units, and the motor sub-winding mechanisms and the inverter units are connected in one-to-one correspondence.

[0014] In the above implementation process, the parallel connection method is flexible, and multiple parallel structures can be formed flexibly according to the structural space, power size, etc. of the driver.

[0015] Further, the number of the multiple motor sub-winding mechanisms is different from the number of the multiple inverter units, and the motor sub-winding mechanisms are connected to one or more of the inverter units in correspondence.

[0016] In the above implementation process, the inverter unit can be flexibly re-paralleled, for example, to form 1+4 parallel, 2+4 parallel, 2+6 parallel, 3+6 parallel, etc., which is convenient for implementing a more compact structure and thermal design for the gallium nitride power transistor and can improve the convenience of the performance design of the driver.

[0017] In a second aspect, the present application provides a control method for a controller, which is applied to the electric drive system controller described in any item of the first aspect, and includes:

[0018] Obtain the operating power data;

[0019] Determine the operating condition data according to the operating power data;

[0020] Generate control data according to the operating condition data, and perform sector-based control adjustment on the electric drive system controller based on the control data.

[0021] In the above implementation process, this control method is a sector-based control method, which can perform sector-based control adjustment according to the vehicle operating load condition to achieve efficiency optimization under different load conditions.

[0022] Further, the operating condition data includes heavy load operating conditions, medium load operating conditions, and idle conditions. The step of generating control data according to the operating condition data includes:

[0023] If the operating condition data is a heavy load operating condition, generate control data for the full load operation of the inverter unit;

[0024] If the operating condition data is a medium load operating condition, generate control data for the alternating operation of the inverter unit;

[0025] If the operating condition data is a medium idle condition, generate control data for the partial operation of the inverter unit.

[0026] Further, the control method further includes:

[0027] Reuse multiple inverter units in the electric drive system controller to output an AC / DC charging current.

[0028] In the above implementation process, the driver can achieve AC and DC charging functions through the reuse of multiple inverter units.

[0029] In a third aspect, the present application provides an electric vehicle, including the electric drive system controller described in any item of the first aspect.

[0030] Other features and advantages disclosed in this application will be described in the subsequent specification, or some features and advantages can be inferred from the specification or determined without doubt, or can be learned by implementing the above technologies disclosed in this application.

[0031] To make the above objects, features, and advantages of this application more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings required for use in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of an electric drive system controller provided by an embodiment of this application;

[0034] Figure 2 It is a circuit structure diagram of an inverter unit provided by an embodiment of this application;

[0035] Figure 3 It is a circuit structure diagram of a 4+4 parallel-connected inverter unit provided by an embodiment of this application;

[0036] Figure 4 It is a circuit structure diagram of a 6+6 parallel-connected inverter unit provided by an embodiment of this application;

[0037] Figure 5 It is a circuit structure diagram of an 8+8 parallel-connected inverter unit provided by an embodiment of this application;

[0038] Figure 6 It is a circuit structure diagram of a 9+9 parallel-connected inverter unit provided by an embodiment of this application;

[0039] Figure 7 It is a circuit structure diagram of a 2+6 parallel-connected inverter unit provided by an embodiment of this application;

[0040] Figure 8 It is a circuit structure diagram of a 3+6 parallel-connected inverter unit provided by an embodiment of this application;

[0041] Figure 9 It is a circuit structure diagram of a 2+8 parallel-connected inverter unit provided by an embodiment of this application;

[0042] Figure 10 It is a circuit structure diagram of a 4+8 parallel-connected inverter unit provided by an embodiment of this application;

[0043] Figure 11 Schematic flowchart of the control method of the controller provided by the embodiment of the present application;

[0044] Figure 12 Circuit structure diagram of 4 groups of parallel-connected structure inverter units provided by the embodiment of the present application;

[0045] Figure 13 Circuit structure diagram of the control logic of gallium nitride power tubes in the upper half of the sine wave of the AC voltage provided by the embodiment of the present application;

[0046] Figure 14 Circuit structure diagram of the control logic of gallium nitride power tubes in the lower half of the sine wave of the AC voltage provided by the embodiment of the present application;

[0047] Figure 15 Circuit structure diagram of boost boost charging control provided by the embodiment of the present application. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but only represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0049] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0050] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances.

[0051] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0053] With the continuous and rapid growth of electric vehicle ownership and the acceleration of the green and low-carbon transformation and upgrading of the power grid, electric vehicles with energy and power systems as the core will evolve towards the technical trend of high voltage, large capacity, high power, integrated and efficient. At present, the electric drive system of new energy vehicles generally uses power semiconductors based on silicon-based IGBT and silicon carbide MOSFET, which are relatively mature in application, but the switching characteristics are more ideal, with higher breakdown voltage, lower on-resistance, higher switching frequency and other characteristics, which can achieve higher energy conversion efficiency and system power density, and have broad application prospects in consumer electronics, industrial electronics and automotive electronics. There are already conventional technical applications around wide bandgap semiconductors (SiC, GaN) in new energy vehicle drive controllers. However, the structural layout of the electric drive system controller on existing electric vehicles is not compact, and it is difficult to achieve high efficiency and high reliability.

[0054] This application makes full use of the advantages of gallium nitride in high frequency, high efficiency, miniaturization and low power, and proposes a new type of motor drive controller, which is applied to the field of power drive systems of tens to hundreds of kilowatts. It adopts gallium nitride power devices, and realizes the compact structure, high efficiency and high reliability of the motor drive controller through the combination of sub-windings and multiple inverter units and sub-sector control.

[0055] See also Figure 1 , Figure 1 A schematic diagram of the structure of an electric drive system controller provided in an embodiment of the present application, the electric drive system controller includes an inverter assembly 100, a motor winding assembly 200 and a busbar mechanism 300;

[0056] The motor winding assembly 200 includes a plurality of motor sub-winding mechanisms ( Figure 1Shown are 8: motor sub-winding mechanisms 210, motor sub-winding mechanism 220, motor sub-winding mechanism 230, motor sub-winding mechanism 240, motor sub-winding mechanism 250, motor sub-winding mechanism 260, motor sub-winding mechanism 270, motor sub-winding mechanism 280), and the inverter assembly 100 includes a plurality of inverter units ( Figure 1 Shown are 8: inverter units 110, inverter unit 120, inverter unit 130, inverter unit 140, inverter unit 150, inverter unit 160, inverter unit 170, inverter unit 180), each inverter unit is connected to a corresponding motor sub-winding mechanism, wherein the input end of the inverter unit is connected to the bus mechanism 300, and the output end of the inverter unit is connected to the corresponding motor sub-winding mechanism, and the inverter unit performs motor inversion control and outputs a preset current to the motor sub-winding mechanism.

[0057] Exemplarily, the electric drive system controller described in the embodiments of the present application, which can also be referred to as a motor controller, is the core control unit of a new energy electric vehicle, responsible for converting the direct current of the power battery into the alternating current required by the drive motor, and realizing functions such as energy recovery and safety protection.

[0058] Exemplarily, the inverter unit in the inverter assembly 100 includes semiconductor power devices; optionally, the semiconductor power devices in the inverter unit use wide bandgap semiconductors, which can be silicon carbide (SiC), gallium nitride (GaN), zinc oxide (ZnO), aluminum nitride (AlN), etc.; wherein, the specific type of the semiconductor power device here is only an example rather than a limitation, and the semiconductor power device in the inverter unit can use other types of wide bandgap semiconductors as needed.

[0059] Exemplarily, the structure of the electric drive system controller can be circularly arranged according to the position of the motor sub-windings. Each motor sub-winding and inverter unit form a separate sector. The inverter units can be flexibly arranged at the end of the motor or arranged in sectors around the stator housing, which is very suitable for applications in compact distributed drive systems such as in-wheel motors. Moreover, the power rating of each inverter unit is a fraction of the total power (determined according to the number of inverter units), and the selection and design of the power devices are simpler.

[0060] Exemplarily, the electric drive system controller provided by the embodiments of the present application, through the parallel combination of split windings and multiple inverter units, makes the drive controller structure compact, the layout flexible, and facilitates the modular and miniaturized design of the power inverter unit; in addition, the electric drive system controller can also achieve the optimization of efficiency under different load conditions through the sector drive control method, with high system control robustness, improving the operation reliability, and realizing the multiplexing of AC and DC charging functions through multiple groups of inverter units, enriching the system functions and reducing the system cost; thus, the electric drive system controller can achieve the technical effects of a compact structure layout, high efficiency, and high reliability performance.

[0061] In some embodiments, the motor split winding mechanism 210 is configured to be annularly arranged, and multiple motor split winding mechanisms are configured as multiple annular sectors, where each annular sector includes a motor split winding mechanism and one or more corresponding inverter units.

[0062] Exemplarily, by configuring the motor split winding mechanism 210 to be annularly arranged, multiple motor split winding mechanisms 210 can be configured as multiple annular sectors, and one or more inverter units are correspondingly connected to each annular sector; thus, through the sector drive control method, the electric drive system controller realizes the optimization of efficiency under different load conditions, with high system control robustness, improving the operation reliability.

[0063] In some embodiments, the inverter unit includes multiple groups of wide bandgap semiconductor power tubes and multiple input capacitors, and the input capacitors are respectively connected to the multiple groups of wide bandgap semiconductor power tubes, where the multiple groups of wide bandgap semiconductor power tubes are connected as a three-phase inverter circuit.

[0064] Exemplarily, the power devices in the inverter unit use wide bandgap semiconductor power tubes. For example, they can be gallium nitride power tubes, so that the characteristics and advantages of gallium nitride in high frequency, high efficiency, miniaturization, and low power can be utilized; furthermore, through the parallel combination of split windings and multiple inverter units, the drive controller structure is made compact, the layout is flexible, and it is convenient for the modular and miniaturized design of the power inverter unit.

[0065] Please refer to Figure 2 , Figure 2 which is a circuit structure diagram of an inverter unit provided by the embodiments of the present application.

[0066] In some embodiments, the inverter unit includes six groups of gallium nitride power tubes, where the six groups of gallium nitride power tubes are star-connected by split windings and connected as a three-phase full-bridge inverter circuit.

[0067] Exemplarily, FIG. 2 shows the composition of the electric drive system controller, which is divided into an inverter unit 110, a motor divided winding mechanism 210, and a common bus 300. The inverter unit specifically includes six groups of gallium nitride power tubes (101 - 106) and an input capacitor 107. The sources of the gallium nitride power tubes 101 / 103 / 105 are respectively connected to the drains of 102 / 104 / 106, and are respectively connected to the three-phase divided windings 20a / 20b / 20c; the drains of the gallium nitride power tubes 101 / 103 / 105 are commonly connected and connected to the positive pole of the input capacitor 107; the sources of the gallium nitride power tubes 102 / 104 / 106 are commonly connected and connected to the negative pole of the input capacitor 107; the six groups of gallium nitride power tubes form a three-phase full-bridge inverter, and the three-phase divided windings are star-connected; the positive bus 30a, the negative bus 30b; since the power level of each inverter unit is 1 / 8 of the total power, a single gallium nitride power tube can be used. Utilizing the technical characteristics of gallium nitride power tubes in low power (~10kW level) and planar packaging, a compact device structure, modular design, and centralized heat dissipation treatment can be achieved.

[0068] Please refer to Figures 3 to 6 , Figure 3 is the circuit structure diagram of the 4 + 4 parallel inverter unit provided by the embodiment of the present application, Figure 4 is the circuit structure diagram of the 6 + 6 parallel inverter unit provided by the embodiment of the present application, Figure 5 is the circuit structure diagram of the 8 + 8 parallel inverter unit provided by the embodiment of the present application, Figure 6 is the circuit structure diagram of the 9 + 9 parallel inverter unit provided by the embodiment of the present application;

[0069] Please refer to Figures 7 to 10 , Figure 7 is the circuit structure diagram of the 2 + 6 parallel inverter unit provided by the embodiment of the present application, Figure 8 is the circuit structure diagram of the 3 + 6 parallel inverter unit provided by the embodiment of the present application, Figure 9 is the circuit structure diagram of the 2 + 8 parallel inverter unit provided by the embodiment of the present application, Figure 10 is the circuit structure diagram of the 4 + 8 parallel inverter unit provided by the embodiment of the present application;

[0070] In some embodiments, the number of multiple motor divided winding mechanisms is the same as the number of multiple inverter units, and the motor divided winding mechanisms are connected to the inverter units in a one-to-one correspondence.

[0071] In some embodiments, the number of multiple motor divided winding mechanisms is different from the number of multiple inverter units, and the motor divided winding mechanisms are connected to one or more inverter units in a corresponding manner.

[0072] Exemplarily, the parallel connection method of the drive controller mentioned in the embodiments of the present application is flexible. First, multiple parallel structures can be formed according to the structural space, power size, etc. of the driver, such as 4+4 parallel connection, 6+6 parallel connection, 8+8 parallel connection, 9+9 parallel connection...; furthermore, the inverter units can be flexibly re-paralleled to form 1+4 parallel connection, 2+4 parallel connection, 2+6 parallel connection, 3+6 parallel connection..., realizing a more compact structure and thermal design for the gallium nitride power tubes, which greatly facilitates the performance design of the driver.

[0073] Please refer to Figure 11 , Figure 11 which is a schematic flowchart of the control method of the controller provided by the embodiments of the present application. The control method includes the following steps:

[0074] In a second aspect, the present application provides a control method for a controller, which is applied to the electric drive system controller of any one of the first aspects, and includes:

[0075] S100: Obtain operation power data;

[0076] S200: Determine operation condition data according to the operation power data;

[0077] S300: Generate control data according to the operation condition data, and perform sector-based control adjustment on the electric drive system controller based on the control data.

[0078] Exemplarily, the control method of the controller provided by the embodiments of the present application is a sector-based control method, which can perform sector-based control adjustment according to the vehicle running load condition to achieve efficiency optimization under different load conditions. Specifically, it includes three operation conditions:

[0079] S1: When the vehicle is running at high speed or accelerating rapidly and other heavy load operation conditions (operation power ≥ 80%), the driver controls each inverter unit to operate at full load;

[0080] S2: When the vehicle is running at a medium speed uniformly or accelerating and decelerating slowly and other medium load operation conditions (20% ≤ operation power ≤ 80%), the driver controls each inverter unit to work alternately;

[0081] S3: When the vehicle is running at low speed or idling (operation power ≤ 20%), the driver controls half of the inverter units to work and stops the other half of the inverter units from working;

[0082] In some embodiments, the operation condition data includes heavy load operation conditions, medium load operation conditions, and idling conditions. The step of generating control data according to the operation condition data includes:

[0083] If the operation condition data is a heavy load operation condition, then generate control data for the inverter unit to operate at full load;

[0084] If the operating condition data is for medium load operation, control data for the alternate operation of the inverter units is generated;

[0085] If the operating condition data is for medium idle speed, control data for partial operation of the inverter units is generated.

[0086] Exemplarily, the electric drive system controller provided by the embodiments of the present application can achieve redundant safety control. An abnormal fault in a certain group of inverter units will not affect the normal operation of the remaining inverter units, and redundant control of N+1 can be achieved. The system has high robustness and the reliability of the driver is greatly improved.

[0087] In some embodiments, the control method further includes:

[0088] Reusing multiple inverter units in the electric drive system controller to output an AC / DC charging current.

[0089] Exemplarily, through the reuse of multiple groups of inverter units, the driver can achieve AC and DC charging functions. Taking Figure 12 the shown 4-group parallel structure as an example, the neutral line of each sub-winding is led out and combined in pairs as the charging input interfaces for AC and DC, and the specific description is as follows:

[0090] S1: The neutral point N1 of the first sub-winding is the AC charging port and is connected to the first relay port L of the AC charger. The neutral point N3 of the third sub-winding is the AC charging port and is connected to the second relay port N of the AC charger. In this way, the charging AC network is connected in series with the first inverter unit and the third inverter unit through the first sub-winding and the third sub-winding respectively, and a boost boost charging topology can be formed to charge the high-voltage bus and the high-voltage battery energy unit of the electric vehicle.

[0091] S2: As Figure 13 , when the AC voltage is in the upper half of the sine wave, control the closing state of the lower bridge arms 132 / 134 / 136 of the third inverter unit so that the AC voltage N is connected to the negative pole of the high-voltage bus, and realize boost boost control by alternately controlling the switching states of the upper and lower bridge arms (111~116) of the first inverter unit;

[0092] S3: As Figure 14 , when the AC power is in the lower half of the sine wave, control the closing state of the lower bridge arms 112 / 114 / 116 of the first inverter unit so that the AC voltage N is connected to the positive pole of the high-voltage bus, and realize boost boost charging control by alternately controlling the switching states of the upper and lower bridge arms (131~136) of the third inverter unit;

[0093] The neutral point N2 of the second component winding is the DC charging port, which is connected to the first relay port VP of the DC charging network. The neutral point N4 of the fourth component winding is the DC charging port, which is connected to the second relay port VN of the DC charging network. In this way, the DC charging network is connected in series with the second inverter unit and the fourth inverter unit through the second sub-winding and the fourth sub-winding respectively, and a boost boost charging topology can be formed to charge the high-voltage bus and the high-voltage battery energy unit of the electric vehicle.

[0094] Such as Figure 15 , control the closing state of the lower bridge arms 142 / 144 / 146 of the fourth inverter unit, so that the negative pole of the DC high voltage is connected to the negative pole of the high-voltage bus, and by alternately controlling the switching states of the upper and lower bridge arms (121-126) of the second inverter unit, boost boost charging control is realized.

[0095] In some embodiments, the present application provides an electric vehicle, including Figures 1 to 10 the electric drive system controller.

[0096] In summary, the gallium nitride drive controller provided by the embodiments of the present application has the following technical characteristics:

[0097] 1. The sub-winding layout is flexible, facilitating ring design, arranged at the end of the motor or around the stator housing, with a compact structure, which is conducive to miniaturization design;

[0098] 2. The power level of the inverter unit becomes smaller, the device selection is simple, which is convenient for modularization and miniaturization; the gallium nitride power device can improve the control frequency and efficiency;

[0099] 3. The sub-windings are driven in sectors, enabling system redundancy control, with high robustness and improving system reliability;

[0100] 4. The system control is flexible, and it can achieve efficiency optimization under different load conditions according to the operating conditions of the whole vehicle, achieving high efficiency under all operating conditions;

[0101] 5. The charging functions of AC and DC are realized through the reuse of multiple inverter units, enriching the system functions and saving the device cost of the whole vehicle.

[0102] The electric drive system controller in the embodiments of the present application makes full use of the characteristic advantages of gallium nitride in high frequency, high efficiency, miniaturization, and low power, and proposes a new type of motor drive controller, which is applied to the field of power drive systems in the range of dozens to one hundred kilowatts. Compared with the application substitution using gallium nitride power devices, the present application adopts a new topology structure, reduces the power application level of the gallium nitride power module, facilitates modular and miniaturized design, has stronger practicability and more prominent innovation; compared with the combination of main inverter and auxiliary inverter and module hybrid packaging, the present application adopts a flexible winding division design and sector division control, with higher control redundancy, stronger robustness and reliability, and the sector division control can achieve the maximum efficiency under different load conditions, which is of great significance for improving the operation efficiency of the whole vehicle under all working conditions.

[0103] A gallium nitride drive controller for new energy vehicles proposed in the present application is applicable to power drive systems in the range of dozens to one hundred kilowatts, and has a wide application prospect in the field of small pure electric vehicle applications. It is also applicable to new distributed drive systems such as in-wheel motors and hub motors, and fields of new drive methods such as aircraft or flying cars, and particularly focuses on application scenarios of miniaturization and high power density.

[0104] It should be understood that the "in the present embodiment", "in the embodiments of the present application", or "as an optional implementation manner" mentioned throughout the specification means that specific features, structures, or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in the present embodiment", "in the embodiments of the present application", or "as an optional implementation manner" that appear throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0105] In various embodiments of the present application, it should be understood that the magnitudes of the serial numbers of the above processes do not necessarily mean the inevitable sequence of execution. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0106] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electric drive system controller, characterized in that: It includes an inverter assembly, a motor winding assembly and a busbar mechanism; The motor winding assembly includes a plurality of motor sub-winding mechanisms, and the inverter assembly includes a plurality of inverter units, each of the inverter units being connected to the corresponding motor sub-winding mechanism, wherein the input end of the inverter unit is connected to the bus mechanism, and the output end of the inverter unit is connected to the corresponding motor sub-winding mechanism, and the motor inverter control is performed and a preset current is output to the motor sub-winding mechanism through the inverter unit.

2. The electric drive system controller according to claim 1, characterized in that: The motor sub-winding mechanism is configured as a ring-shaped arrangement, and a plurality of the motor sub-winding mechanisms are configured as a plurality of ring sectors, wherein each ring sector includes one motor sub-winding mechanism and corresponding one or more inverter units.

3. The electric drive system controller according to claim 1 or 2, characterized in that: The inverter unit includes multiple groups of wide bandgap semiconductor power tubes and multiple input capacitors, and the input capacitors are respectively connected to the multiple groups of wide bandgap semiconductor power tubes, wherein the multiple groups of wide bandgap semiconductor power tubes are connected to form a three-phase inverter circuit.

4. The electric drive system controller according to claim 3, characterized in that: The inverter unit includes six groups of gallium nitride power tubes, wherein the six groups of gallium nitride power tubes are connected in a star shape by windings and are connected to form a three-phase full-bridge inverter circuit.

5. The electric drive system controller according to claim 1, characterized in that: The number of the plurality of motor sub-winding mechanisms is the same as the number of the plurality of inverter units, and the motor sub-winding mechanisms are connected to the inverter units in a one-to-one correspondence.

6. The electric drive system controller according to claim 1, characterized in that: The number of the plurality of motor sub-winding mechanisms is different from the number of the plurality of inverter units, and the motor sub-winding mechanisms are correspondingly connected to one or more of the inverter units.

7. A control method of a controller, characterized in that: The electric drive system controller according to any one of claims 1 to 6 comprises: Get operating power data; Determining operating condition data according to the operating power data; Control data is generated according to the operating condition data, and sector-by-sector control and adjustment is performed on the electric drive system controller based on the control data.

8. The control method of the controller according to claim 7, characterized in that: The operating condition data includes a heavy load operating condition, a medium load operating condition and an idling condition. The step of generating control data according to the operating condition data includes: If the operating condition data is a heavy load operating condition, generating control data for full load operation of the inverter unit; If the operating condition data is a medium load operating condition, generating control data for alternating operation of the inverter unit; If the operating condition data is a medium idle condition, control data for partial operation of the inverter unit is generated.

9. The control method of the controller according to claim 7, characterized in that: The control method further comprises: Multiple inverter units in the electric drive system controller are reused to output AC / DC charging current.

10. An electric vehicle, characterized in that: Comprising an electric drive system controller as described in any one of claims 1 to 6.

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