Drive system and vehicle

Abstract

The utility model discloses a kind of driving system and vehicle. Driving system includes battery connection port, first inverter, motor, at least one relay, second inverter and controller, first inverter is connected with battery connection port, including N-phase first bridge arm;Motor includes N-phase winding, the first end of N-phase winding is respectively connected with the neutral point of N-phase first bridge arm corresponding;Second inverter includes N-phase second bridge arm, wherein neutral point is respectively connected with the second end of N-phase winding corresponding;Relay is connected between the same end of N-phase first bridge arm and the same end of N-phase second bridge arm;Controller is connected with relay, N-phase first bridge arm and N-phase second bridge arm, for controlling relay, first inverter and second inverter, make driving system run corresponding working mode, and working mode includes at least one in common bus type mode, hybrid power type mode and Y type connection mode. The utility model solves the technical problem of low control efficiency of driving system.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, and more specifically, to a drive system and a vehicle. Background Technology

[0002] Currently, open-winding motor drive systems (including open-winding motor drive systems) are an emerging technology that exhibits significant advantages over traditional Y-connected motor drive systems. Open-winding motor drive systems not only offer more precise control flexibility but also achieve significant improvements in drive power and overall energy efficiency, thanks to their unique winding structure and drive circuit design.

[0003] However, the diversity of open-wound motor drive systems also presents challenges. Different types of open-wound motor drive systems each have specific high-efficiency operating ranges and power output limits. This characteristic means that the efficiency advantage of a single type of open-wound motor drive system can only be realized under limited conditions when facing a wide range of application scenarios. It also limits the uniformity of system power, making it impossible to flexibly adjust to changing demands. This results in lower control efficiency of the drive system under complex operating conditions, thus hindering good energy utilization and performance.

[0004] There is currently no effective solution to the low control efficiency of the aforementioned drive system. Utility Model Content

[0005] This utility model provides a drive system and a vehicle to at least solve the technical problem of low control efficiency of the drive system.

[0006] According to one aspect of the present invention, a drive system is provided. The drive system may include: a battery connection port, a first inverter, a motor, a second inverter, at least one relay, and a controller. The first inverter is connected to the battery connection port and includes an N-phase first bridge arm. The motor includes an N-phase winding, with the first ends of the N-phase windings respectively connected to the neutral points of the N-phase first bridge arms. The second inverter includes an N-phase second bridge arm, with the neutral points of the N-phase second bridge arms respectively connected to the second ends of the N-phase windings. The relay is connected between the same end of the N-phase first bridge arm and the same end of the N-phase second bridge arm. The controller is connected to the relay, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the relay, the first inverter, and the second inverter to enable the drive system to operate in a corresponding operating mode. The operating mode includes at least one of a common bus mode, a hybrid power supply mode, and a Y-connection mode.

[0007] Optionally, the relay includes: a first relay connected between a first end of the first arm of the N-phase bridge and a first end of the second arm of the N-phase bridge, wherein the first end of the first arm of the N-phase bridge is connected to the positive terminal of the DC bus of the first inverter, and the first end of the second arm of the N-phase bridge is connected to the positive terminal of the DC bus of the second inverter; and / or, a second relay connected between a second end of the first arm of the N-phase bridge and a second end of the second arm of the N-phase bridge, wherein the second end of the first arm of the N-phase bridge is connected to the negative terminal of the DC bus of the first inverter, and the second end of the second arm of the N-phase bridge is connected to the negative terminal of the DC bus of the second inverter.

[0008] Optionally, the controller is used to control the relay, the first inverter, and the second inverter in response to the control signal corresponding to the common bus mode, so that the drive system operates in the corresponding common bus mode, wherein in the N-phase first bridge arm, the state of one phase upper bridge arm is the same as the state of the remaining phase lower bridge arms; in the N-phase second bridge arm, the state of two phase upper bridge arms is the same as the state of the remaining phase lower bridge arms; or, in the N-phase first bridge arm, the state of two phase upper bridge arms is the same as the state of the remaining phase lower bridge arms; in the N-phase second bridge arm, the state of one phase upper bridge arm is the same as the state of the remaining phase lower bridge arms; both the first relay and the second relay are in the closed state.

[0009] Optionally, in the first N-phase bridge arm, one upper phase bridge arm is in a closed state, the other two lower phase bridge arms are in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, two upper phase bridge arms are in a closed state, the other lower phase bridge arm is in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; wherein, the neutral points corresponding to the two upper phase bridge arms in the closed state in the second N-phase bridge arm, and the neutral points corresponding to the other two lower phase bridge arms in the closed state in the first N-phase bridge arm, are connected to the corresponding two phase windings in the N-phase winding; the neutral points corresponding to the other lower phase bridge arm in the closed state in the second N-phase bridge arm, and the neutral points corresponding to the one upper phase bridge arm in the closed state in the first N-phase bridge arm, are connected to the corresponding one phase winding in the N-phase winding.

[0010] Optionally, in the first N-phase bridge arm, two upper phase bridge arms are in a closed state, the remaining lower phase bridge arm is in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, one upper phase bridge arm is in a closed state, the remaining two lower phase bridge arms are in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; wherein, the neutral point corresponding to the closed upper phase bridge arm in the second N-phase bridge arm, and the neutral point corresponding to the remaining lower phase bridge arm in the first N-phase bridge arm, are connected to the corresponding phase winding in the N-phase winding; the neutral points corresponding to the remaining two lower phase bridge arms in the second N-phase bridge arm, and the neutral points corresponding to the two closed upper phase bridge arms in the first N-phase bridge arm, are connected to the corresponding two phase windings in the N-phase winding.

[0011] Optionally, the drive system further includes: a first capacitor connected in parallel with the second inverter; a battery connection port for connecting a battery; and a controller for controlling the relay, the first inverter, and the second inverter in response to a control signal corresponding to the hybrid power mode, so that the drive system operates in the corresponding hybrid power mode. In the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms; in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms, to charge the first capacitor; in the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms; in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms, to discharge the first capacitor and the battery; the relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes a first relay, which is in an open state; or, the relay includes a second relay, which is in an open or closed state.

[0012] Optionally, for charging the first capacitor, in the N-phase first bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state; in the N-phase second bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state; wherein, the neutral point corresponding to the closed upper bridge arm in the N-phase second bridge arm, and the neutral point corresponding to the closed upper bridge arm in the N-phase first bridge arm, are connected to the corresponding phase winding in the N-phase winding; the neutral points corresponding to the remaining lower bridge arms in the N-phase second bridge arm, and the neutral points corresponding to the remaining lower bridge arms in the N-phase first bridge arm, are connected to the corresponding phase winding in the N-phase winding.

[0013] Optionally, for the discharge of the first capacitor and battery, the second relay is in the open state, wherein in the N-phase first bridge arm, one phase upper bridge arm is in the closed state, the other two phase lower bridge arms are in the closed state, and the other bridge arms in the N-phase first bridge arm are all in the open state; in the N-phase second bridge arm, one phase upper bridge arm is in the closed state, the other two phase lower bridge arms are in the closed state, and the other bridge arms in the N-phase second bridge arm are all in the open state; wherein, the neutral point corresponding to the closed phase upper bridge arm in the N-phase second bridge arm, and the neutral point corresponding to the closed phase upper bridge arm in the N-phase first bridge arm... The neutral point corresponding to the other lower bridge arm in the closed state is connected to the corresponding phase winding in the N-phase winding; the neutral point corresponding to the other lower bridge arm in the closed state of the second bridge arm of the N-phase, and the neutral point corresponding to the upper bridge arm in the closed state of the first bridge arm of the N-phase, are connected to the corresponding phase winding in the N-phase winding; the neutral point corresponding to the other lower bridge arm in the closed state of the second bridge arm of the N-phase, and the neutral point corresponding to the other lower bridge arm in the closed state of the first bridge arm of the N-phase, are connected to the corresponding phase winding in the N-phase winding.

[0014] Optionally, when the first capacitor and battery are discharging, the second relay is in a closed state. Specifically, in the N-phase first bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the N-phase first bridge arm are open. Similarly, in the N-phase second bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the N-phase second bridge arm are open. The neutral point corresponding to the closed upper bridge arm in the N-phase second bridge arm, and the neutral point corresponding to the closed lower bridge arm in the N-phase first bridge arm, are connected to the corresponding phase winding in the N-phase winding. The neutral points corresponding to the closed lower bridge arm in the N-phase second bridge arm, and the neutral point corresponding to the closed upper bridge arm in the N-phase first bridge arm, are connected to the corresponding phase winding in the N-phase winding.

[0015] Optionally, the controller is used to control the relay, the first inverter, and the second inverter in response to the control signal corresponding to the Y-type connection mode, so that the drive system operates in the corresponding Y-type connection mode, wherein in the N-phase first bridge arm, one phase upper bridge arm is in a closed state, and the remaining phase lower bridge arm is in a closed state, wherein the other bridge arms in the N-phase first bridge arm are all in an open state; in the N-phase second bridge arm, two phase upper bridge arms are in a closed state, wherein the bridge arms in the N-phase second bridge arm except for the two phase upper bridge arms are all in an open state; the relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes a first relay, which is in an open state; or, the relay includes a second relay, which is in an open state.

[0016] Optionally, the drive system also includes a second capacitor connected in parallel with the first inverter.

[0017] According to another aspect of the present invention, a vehicle is also provided. The vehicle includes the drive system of the present invention.

[0018] In this embodiment of the invention, a drive system integrating multiple drive modes is provided. The drive system includes a battery connection port, a first inverter, a motor, a second inverter, at least one relay, and a controller. The first inverter is connected to the battery and can be used to convert the current supplied by the battery. The motor includes an N-phase winding, the first ends of which are respectively connected to the neutral points of the first arm of the N-phase bridge. The second inverter includes an N-phase second arm, the neutral points of which are respectively connected to the second ends of the N-phase winding. Through the above-described connection between the first inverter, the motor, and the second inverter, an open winding connection can be achieved between the N-phase winding of the motor and the first and second inverters. The drive system also includes a relay connected between the same end of the first arm of the N-phase bridge and the same end of the second arm of the N-phase bridge, which can be used to change the connection between the first inverter and the second inverter. The controller in the drive system can be used to control the switching action of the relay, the bridge arm of the first inverter, and the bridge arm of the second inverter, thereby enabling the drive system to switch between different operating modes. This achieves the goal of comprehensively optimizing the control of the drive system, avoiding the situation where the efficiency advantage of the drive system can only be exerted under limited conditions and the system power is singular. This achieves the technical effect of improving the control efficiency of the drive system and solves the technical problem of low control efficiency of the drive system. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of the embodiments of the present invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a drive system according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of another driving system according to an embodiment of the present utility model; Figure 3(A) is a schematic diagram of a drive system in a common bus mode according to an embodiment of the present utility model; Figure 3(B) is a schematic diagram of a drive system in another common bus configuration according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a capacitor charging drive system in a hybrid power supply mode according to an embodiment of the present invention. Figure 5(A) is a schematic diagram of a capacitor and battery discharge drive system in a hybrid power supply mode according to an embodiment of the present invention. Figure 5(B) is a schematic diagram of a capacitor and battery discharge drive system in another hybrid power supply mode according to an embodiment of the present invention. Figure 6 This is a schematic diagram of a drive system in a Y-type connection mode according to an embodiment of the present utility model; Figure 7 A schematic diagram of an open-winding motor drive system with a common busbar structure according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of a hybrid power supply capacitor type open winding motor drive system according to an embodiment of the present utility model; Figure 9 This is a schematic diagram of a Y-connected motor drive system according to an embodiment of the present utility model; Figure 10 This is a schematic diagram of the high-efficiency range and output capability of an electric system according to an embodiment of the present utility model; Figure 11 This is a schematic diagram of another driving system according to an embodiment of the present utility model; Figure 12 This is a schematic diagram of another driving system according to an embodiment of the present utility model. Specific Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that includes a series of steps or units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0022] According to an embodiment of the present invention, an embodiment of a drive system is provided.

[0023] In this embodiment, the drive system, also known as the motor drive system, can be referred to as the drive device, and can be deployed in a mobile device, wherein the mobile device can be a vehicle.

[0024] Figure 1 This is a schematic diagram of a drive system according to an embodiment of the present utility model. Figure 1 As shown, the drive system 10 may include: a battery connection port 11, a first inverter 12, a motor 13, a second inverter 14, at least one relay 15, and a controller 16.

[0025] The first inverter 12 is connected to the battery connection port 11 and includes an N-phase first bridge arm.

[0026] In this embodiment, the first inverter 12, which can be referred to as the first converter, is an AC-DC converter used to convert DC power into AC power to provide electrical energy for driving the motor 13. The first inverter 12 can be connected to a battery connection port 11, which can be connected to a battery (e.g., a high-voltage battery). Based on this, the first inverter 12 can convert electrical energy from the battery into a form suitable for the drive system 10. The battery connection port 11 can be an interface for connecting the battery to the drive system, and the battery can be used to provide stable electrical energy to the motor 13.

[0027] The first inverter 12 in this embodiment may include an N-phase first bridge arm, which may contain multiple switching components for controlling the current flowing through the motor 13. The switching components, i.e., the bridge arm switches of the first inverter 12, may be semiconductor switches, such as insulated gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), or other power switching devices.

[0028] The motor 13 includes an N-phase winding, the first end of which is connected to the neutral point of the first bridge arm of the N-phase winding.

[0029] In this embodiment, the motor 13 may include N-phase windings and may employ an open winding configuration; therefore, the motor can be called an open-winding motor. Optionally, the motor 13 is an open-winding permanent magnet synchronous motor (PMSM-OEW). The windings in the motor 13 are classified according to the number of phases (i.e., the aforementioned N phases), where N is an integer greater than 1. For example, if N is 3, the motor 13 is a three-phase motor; if N is 5, the motor 13 is a five-phase motor, and so on. The aforementioned N-phase windings can be N independent windings, each corresponding to one phase, to generate a multi-phase alternating magnetic field, thereby driving the motor 13 to operate.

[0030] The motor 13 is connected to the first inverter 12, which can be achieved by connecting the first end of the N-phase winding of the motor 13 to the neutral point of the first N-phase bridge arm of the first inverter 12. That is, the first end of each phase winding of the motor 13 can be directly connected to the neutral point of the corresponding phase bridge arm in the first inverter 12. For example, the N-phase winding of the motor 13 may be a three-phase winding, including a first phase winding, a second phase winding, and a third phase winding. The first end of the first phase winding is connected to the neutral point of the first phase bridge arm of the first inverter 12, the first end of the second phase winding is connected to the neutral point of the second phase bridge arm of the first inverter 12, and the first end of the third phase winding is connected to the neutral point of the third phase bridge arm of the first inverter 12. This allows the first inverter 12 to directly control the current flowing through the windings of the motor 13 by controlling the state of the bridge arm switches (e.g., closed or open), thereby controlling the speed and direction of the motor 13.

[0031] The second inverter 14 includes an N-phase second bridge arm, the neutral point of which is connected to the second end of the N-phase winding respectively.

[0032] In this embodiment, the second inverter 14 can be referred to as the second converter, which can be an AC-DC converter, including an N-phase second bridge arm, the neutral point of which is connected to the second end of the N-phase winding respectively. By controlling the closing or opening of the power switch in the second converter, it can work in coordination with the first inverter 12 in the working mode, thereby realizing the efficient operation and dynamic control of the motor 13 in the working mode.

[0033] Relay 15 is connected between the same end of the first bridge arm of N phases and the same end of the second bridge arm of N phases.

[0034] In this embodiment, the relay 15 is an electromechanical switching device for the drive system 10. There can be one or more relays, for example, two. The relay 15 is connected between the same end of the N-phase first bridge arm in the first inverter 12 and the same end of the N-phase second bridge arm in the second inverter 14. It can control the connection status of the circuits in the drive system 10, such as controlling whether the first inverter 12 and the second inverter 14 are connected, thereby enabling rapid switching of the drive system 10 between different operating modes.

[0035] It should be noted that the same end of the first N-phase bridge arm mentioned above refers to the end that is far away from the neutral point of the first N-phase bridge arm in the first inverter 12, and the same end of the second N-phase bridge arm in the second inverter 14 refers to the end that is far away from the neutral point of the second N-phase bridge arm in the second inverter 14.

[0036] Optionally, the relay 15 described above in this embodiment can also provide a protection mechanism for the drive system 10. When an overload, short circuit, or other abnormal condition is detected in the drive system 10, the relay 15 can quickly disconnect the circuit of the drive system 10 to prevent the abnormal condition from escalating further, thereby protecting the components in the drive system 10, such as the first inverter 12, the second inverter 14, and the motor 13, from damage.

[0037] This embodiment allows for more flexible and varied operating modes of the drive system 10 by controlling the relay 15. Optionally, the switching state of the relay 15 can be dynamically adjusted by the controller 16 based on sensor feedback, thereby optimizing the drive efficiency and response speed of the drive system 10.

[0038] The controller 16 is connected to the relay 15, the N-phase first bridge arm and the N-phase second bridge arm, and is used to control the relay 15, the first inverter 12 and the second inverter 14 so that the drive system operates in the corresponding working mode. The working mode is a drive mode for driving the drive system 10, which may include at least one of the common bus mode, the hybrid power supply mode and the Y-type connection mode.

[0039] In this embodiment, the controller 16 can be used to control the switching state of the relay 15 to realize the connection or disconnection of the DC bus between the first inverter 12 and the second inverter 14; the controller 16 can be used to control the conduction or cutoff of the bridge arm switch of the first inverter 12 and the bridge arm switch of the second inverter 14 to generate the AC power required by the motor 13, thereby driving the motor 13 to operate in the desired working mode.

[0040] In the aforementioned common bus configuration, controller 16 can control relay 15 to close, connecting the DC buses of the first inverter 12 and the second inverter 14 together to form a common bus structure. The first inverter 12 and the second inverter 14 can simultaneously draw energy from the same power source to provide drive current to the N-phase winding of the motor 13. When the drive system 10 is in this common bus configuration, since the first inverter 12 and the second inverter 14 share the same DC bus, system efficiency and power output under high loads can be optimized.

[0041] For the aforementioned hybrid power supply mode, the controller 16 can be used to control the relay 15 to disconnect, thereby electrically isolating the DC buses of the first inverter 12 and the second inverter 14. If the capacitor connected in parallel with the second inverter 12 is in a charging state, the first inverter 12 and the second inverter 14 can independently obtain power from different power sources. When the drive system 10 is in hybrid power supply mode, because the relay 15 is disconnected, the drive system 10 can utilize the floating capacitor as an auxiliary power source to participate in energy conversion, which can improve the system efficiency under medium and low load conditions.

[0042] For the Y-type connection mode described above, the controller 16 can selectively disconnect some of the bridge arm switches of the second inverter 14, allowing only the other half of the bridge arm to participate in the operation. At this time, the drive system degenerates into a motor drive system with Y-type winding connection.

[0043] In this embodiment of the invention, a drive system integrating multiple drive modes is provided. The drive system includes a battery connection port 11, a first inverter 12, a motor 13, a second inverter 14, at least one relay 15, and a controller 16. The first inverter 12 is connected to the battery and can be used to convert the current supplied by the battery. The motor 13 includes an N-phase winding, the first end of which is connected to the neutral point of the first arm of the N-phase bridge. The second inverter 14 includes an N-phase second arm, the neutral point of which is connected to the second end of the N-phase winding. Through the above connection configuration between the first inverter 12, the motor 13, and the second inverter 14, an open winding connection can be achieved between the N-phase winding of the motor 13 and the first and second inverters 12 and 14. The drive system also includes a relay 15, which is connected between the same end of the first arm of the N-phase bridge and the same end of the second arm of the N-phase bridge, and can be used to change the connection configuration between the first inverter 12 and the second inverter 14. The controller 16 in the drive system can be used to control the switching action of the relay 15, the bridge arm of the first inverter 12 and the bridge arm of the second inverter 14, thereby enabling the drive system to switch between different working modes. This achieves the goal of comprehensively optimizing the control of the drive system, avoiding the fact that the efficiency advantage of the drive system can only be exerted under limited conditions and the system power is singular. This achieves the technical effect of improving the control efficiency of the drive system and solves the technical problem of low control efficiency of the drive system.

[0044] The driving system of this utility model embodiment will be further described below.

[0045] As an optional embodiment, the relay includes: a first relay connected between a first end of an N-phase first bridge arm and a first end of an N-phase second bridge arm, wherein the first end of the N-phase first bridge arm is connected to the positive terminal of the DC bus of the first inverter, and the first end of the N-phase second bridge arm is connected to the positive terminal of the DC bus of the second inverter; and / or, a second relay connected between a second end of an N-phase first bridge arm and a second end of an N-phase second bridge arm, wherein the second end of the N-phase first bridge arm is connected to the negative terminal of the DC bus of the first inverter, and the second end of the N-phase second bridge arm is connected to the negative terminal of the DC bus of the second inverter.

[0046] In this embodiment, the number of relays can be one or two. Therefore, the relays can include a first relay and / or a second relay. The first relay can be represented by S1, and the second relay by S2; no specific limitation is made here.

[0047] The first relay is connected between the first end of the first bridge arm of the N-phase in the first inverter and the first end of the second bridge arm of the N-phase in the second inverter. The first end of the first bridge arm of the N-phase refers to the common connection terminal of the upper bridge arm in the first inverter's N-phase first bridge arm, which can be the positive terminal of the DC power supply. The first end of the second bridge arm of the N-phase refers to the common connection terminal of the upper bridge arm in the second inverter's N-phase second bridge arm.

[0048] The first end of the first arm of the N-phase inverter is connected to the positive terminal of the DC bus of the first inverter, and the first end of the second arm of the N-phase inverter is connected to the positive terminal of the DC bus of the second inverter. That is, in this embodiment, the first relay is connected to the positive terminals of the DC sides of both the first and second inverters. Therefore, when the first relay is closed, the positive terminals of the DC sides of the first and second inverters can be connected to form a common bus structure, allowing the first and second inverters to share the same power supply.

[0049] The second relay is connected between the second end of the first bridge arm of the N-phase in the first inverter and the second end of the second bridge arm of the N-phase in the second inverter. The second end of the first bridge arm refers to the common connection terminal of the lower bridge arm in the first N-phase bridge arm of the first inverter, which can be the negative terminal of the DC power supply. The second end of the second bridge arm refers to the common connection terminal of the lower bridge arm in the second N-phase bridge arm of the second inverter.

[0050] The second end of the first arm of the N-phase inverter is connected to the negative terminal of the DC bus of the first inverter, and the second end of the second arm of the N-phase inverter is connected to the negative terminal of the DC bus of the second inverter. That is, in this embodiment, the second relay is connected to the negative terminal of the DC side of both the first and second inverters. Therefore, when the second relay is closed, the negative terminals of the DC sides of the first and second inverters can be connected to form a common bus structure, allowing the first and second inverters to share the same power supply.

[0051] This embodiment can control the first relay, the second relay, the N-phase first bridge arm, and the N-phase second bridge arm via a controller to dynamically switch the operating mode of the drive system, such as a common bus mode, a hybrid power supply mode, or a Y-connection mode. This dynamic configuration not only improves the energy efficiency of the drive system but also increases the flexibility and reliability of the motor drive, thereby allowing the drive system to switch between different power requirements and efficiency optimization goals.

[0052] The first end, the second end, and the neutral point of the N-phase first bridge arm of the above embodiment, as well as the first end, the second end, and the neutral point of the N-phase second bridge arm, will be further described below.

[0053] As an optional embodiment, the first end of the N-phase first bridge arm includes one end of each of the three phases: the first phase upper bridge arm, the second phase upper bridge arm, and the third phase upper bridge arm; the second end of the N-phase first bridge arm includes one end of each of the three phases: the first phase lower bridge arm, the second phase lower bridge arm, and the third phase lower bridge arm; the neutral point of the N-phase first bridge arm includes the other end of each of the three phases: the first phase upper bridge arm, the second phase upper bridge arm, and the third phase upper bridge arm, as well as the three phases: the first phase lower bridge arm, the second phase lower bridge arm, and the third phase lower bridge arm. The other end of the N-phase second bridge arm; the first end of the N-phase second bridge arm includes: one end of the first phase upper bridge arm, the second phase upper bridge arm and the third phase upper bridge arm of the N-phase second bridge arm; the second end of the N-phase second bridge arm includes: one end of the first phase lower bridge arm, the second phase lower bridge arm and the third phase lower bridge arm of the N-phase second bridge arm; the neutral point of the N-phase second bridge arm includes: the other end of the first phase upper bridge arm, the second phase upper bridge arm and the third phase upper bridge arm of the N-phase second bridge arm, and the other end of the first phase lower bridge arm, the second phase lower bridge arm and the third phase lower bridge arm of the N-phase second bridge arm.

[0054] In this embodiment, the N-phase first bridge arm in the first inverter can be a three-phase first bridge arm (i.e., N=3). A three-phase first bridge arm can include a first phase bridge arm, a second phase bridge arm, and a third phase bridge arm. Specifically, the first phase bridge arm includes a first phase upper bridge arm and a first phase lower bridge arm; the second phase bridge arm includes a second phase upper bridge arm and a second phase lower bridge arm; and the third phase bridge arm includes a third phase upper bridge arm and a third phase lower bridge arm.

[0055] In this embodiment, the first upper bridge arm of the N-phase first bridge arm can be a specific part of the N-phase first bridge arm, connected to the first phase winding of the motor, and used to provide a positive voltage to the first phase winding; the second upper bridge arm of the N-phase first bridge arm is another part of the N-phase first bridge arm, connected to the second phase winding of the motor, and also used to provide a positive voltage to the second phase winding; the third upper bridge arm of the N-phase first bridge arm is yet another part of the N-phase first bridge arm, connected to the third phase winding of the motor, and can be used to provide a positive voltage to the third phase winding. The first end of the aforementioned N-phase first bridge arm in this embodiment can include one end of the first, second, and third upper bridge arms of the N-phase first bridge arm, which can be the end of the first, second, or third upper bridge arms of the N-phase first bridge arm connected to the positive terminal of the DC power supply.

[0056] In this embodiment, the lower arm of the first phase of the N-phase first bridge arm corresponds to the upper arm of the first phase of the N-phase first bridge arm and is located on the other side of the first inverter, used to provide reverse or ground voltage to the first phase winding of the motor; the lower arm of the second phase of the N-phase first bridge arm corresponds to the upper arm of the second phase of the N-phase first bridge arm and is located on the other side of the first inverter, used to provide reverse or ground voltage to the second phase winding of the motor; the lower arm of the third phase of the N-phase first bridge arm corresponds to the upper arm of the third phase of the N-phase first bridge arm and is located on the other side of the first inverter, used to provide reverse or ground voltage to the third phase winding of the motor. The second end of the aforementioned N-phase first bridge arm in this embodiment may include one end of the lower arm of the first phase, the lower arm of the second phase, and the lower arm of the third phase of the N-phase first bridge arm, which may be the end of the upper arm of the first phase, the upper arm of the second phase, or the upper arm of the third phase of the N-phase first bridge arm connected to the negative terminal of the DC power supply.

[0057] Based on the above, the neutral point of the N-phase first bridge arm may include: the other ends of the first phase upper bridge arm, the second phase upper bridge arm, and the third phase upper bridge arm of the N-phase first bridge arm, as well as the other ends of the first phase lower bridge arm, the second phase lower bridge arm, and the third phase lower bridge arm of the N-phase first bridge arm. That is, the neutral point of the N-phase first bridge arm in this embodiment covers the other ends of all the upper bridge arms in the N-phase first bridge arm (the ends connected to the first end of the N-phase winding of the motor), and the other ends of all the lower bridge arms in the N-phase first bridge arm (the ends connected to the first end of the N-phase winding of the motor).

[0058] In this embodiment, the N-phase second bridge arm in the second inverter can be a three-phase second bridge arm (i.e., N=3). A three-phase second bridge arm can include a first phase bridge arm, a second phase bridge arm, and a third phase bridge arm. Specifically, the first phase bridge arm includes a first phase upper bridge arm and a first phase lower bridge arm; the second phase bridge arm includes a second phase upper bridge arm and a second phase lower bridge arm; and the third phase bridge arm includes a third phase upper bridge arm and a third phase lower bridge arm.

[0059] In this embodiment, the first phase upper bridge arm of the N-phase second bridge arm can be a specific part of the N-phase second bridge arm, connected to the first phase winding of the motor, and used to control the voltage of the first phase winding of the motor; the second phase upper bridge arm of the N-phase second bridge arm is another part of the N-phase second bridge arm, connected to the second phase winding of the motor, and also used to control the voltage of the second phase winding of the motor; the third phase upper bridge arm of the N-phase second bridge arm is yet another part of the N-phase second bridge arm, connected to the third phase winding of the motor, and used to control the voltage of the third phase winding of the motor. The first end of the aforementioned N-phase second bridge arm in this embodiment can include one end of the first, second, and third phase upper bridge arms of the N-phase second bridge arm, which can be the end of the first, second, or third phase upper bridge arm of the N-phase second bridge arm connected to the positive terminal of the DC power supply.

[0060] In this embodiment, the lower arm of the first phase of the N-phase second bridge arm corresponds to the upper arm of the first phase of the N-phase second bridge arm and is located on the other side of the second inverter, used to control the voltage of the first phase winding of the motor; the lower arm of the second phase of the N-phase second bridge arm corresponds to the upper arm of the second phase of the N-phase second bridge arm and is located on the other side of the second inverter, used to control the voltage of the second phase winding of the motor; the lower arm of the third phase of the N-phase second bridge arm corresponds to the upper arm of the third phase of the N-phase second bridge arm and is located on the other side of the second inverter, used to control the voltage of the third phase winding of the motor. The second end of the aforementioned N-phase second bridge arm in this embodiment may include one end of the lower arm of the first phase, the lower arm of the second phase, and the lower arm of the third phase of the N-phase second bridge arm, which may be the end of the upper arm of the first phase, the upper arm of the second phase, or the upper arm of the third phase of the N-phase second bridge arm connected to the negative terminal of the DC power supply.

[0061] Based on the above, the neutral point of the N-phase second bridge arm includes: the other ends of the first phase upper bridge arm, the second phase upper bridge arm, and the third phase upper bridge arm in the N-phase second bridge arm, as well as the other ends of the first phase lower bridge arm, the second phase lower bridge arm, and the third phase lower bridge arm in the N-phase second bridge arm. That is, the neutral point of the N-phase second bridge arm in this embodiment covers the other ends of all the upper bridge arms in the N-phase second bridge arm (the ends connected to the second end of the N-phase winding of the motor), and the other ends of all the lower bridge arms in the N-phase second bridge arm (the ends connected to the second end of the N-phase winding of the motor).

[0062] In this embodiment, the structure of the N-phase first bridge arm in the first inverter and the N-phase second bridge arm in the second inverter forms the basis for enabling the drive system to operate in different working modes. By controlling the bridge arm switches of the first and second inverters, as well as the first and / or second relays, the drive system can flexibly switch between multiple working modes, such as between common bus mode, hybrid power supply mode, and Y-connection mode, thereby allowing the drive system to adapt to different operating conditions and efficiency optimization requirements.

[0063] The relationship between the N-phase winding of this embodiment and the first N-phase bridge arm in the first inverter and the second N-phase bridge arm in the second inverter will be further described below.

[0064] As an optional embodiment, the first end of the first phase winding in the N-phase winding is connected to the neutral point of the first phase upper bridge arm and the first phase lower bridge arm in the N-phase first bridge arm, and the second end of the first phase winding is connected to the neutral point of the first phase upper bridge arm and the first phase lower bridge arm in the N-phase second bridge arm; the first end of the second phase winding in the N-phase winding is connected to the neutral point of the second phase upper bridge arm and the second phase lower bridge arm in the N-phase first bridge arm, and the second end of the second phase winding is connected to the neutral point of the second phase upper bridge arm and the second phase lower bridge arm in the N-phase second bridge arm; the first end of the third phase winding in the N-phase winding is connected to the neutral point of the third phase upper bridge arm and the third phase lower bridge arm in the N-phase first bridge arm, and the second end of the third phase winding is connected to the neutral point of the third phase upper bridge arm and the third phase lower bridge arm in the N-phase second bridge arm.

[0065] In this embodiment, the N-phase winding of the motor can be a three-phase winding (i.e., N=3), including a first-phase winding, a second-phase winding, and a third-phase winding. The first-phase winding can be the winding of the first phase of the motor, the second-phase winding can be the winding of the second phase of the motor, and the third-phase winding can be the winding of the third phase of the motor, independent of the first and second-phase windings, thus forming a complete three-phase drive system for the motor.

[0066] The first end of the first phase winding in the N-phase winding is connected to the neutral point of the upper and lower bridge arms of the first phase in the N-phase first bridge arm. The neutral point here refers to the end of the bridge arm switch of the upper and lower bridge arms of the first phase in the N-phase first bridge arm that is not directly connected to the positive and negative terminals of the DC power supply.

[0067] The second end of the first phase winding is connected to the neutral point of the upper and lower bridge arms of the first phase in the second bridge arm of the N-phase system. Here, the neutral point refers to the end of the bridge arm switch of the upper and lower bridge arms of the first phase in the second bridge arm of the N-phase system that is not directly connected to the positive and negative terminals of the DC power supply.

[0068] The first end of the second phase winding in the N-phase winding is connected to the neutral point of the upper and lower bridge arms of the second phase in the first bridge arm of the N-phase. Here, the neutral point refers to the end of the bridge arm switch of the upper bridge arm of the second phase and the bridge arm switch of the lower bridge arm of the second phase in the first bridge arm of the N-phase that is not directly connected to the positive and negative terminals of the DC power supply.

[0069] The second end of the second phase winding is connected to the neutral point of both the upper and lower bridge arms of the second phase in the N-phase second bridge arm. Here, the neutral point refers to the end of the bridge arm switch of the upper and lower bridge arms of the second phase in the N-phase second bridge arm that is not directly connected to the positive and negative terminals of the DC power supply.

[0070] The first end of the third phase winding in the N-phase winding is connected to the neutral point of the upper and lower bridge arms of the third phase in the first bridge arm of the N-phase. Here, the neutral point refers to the end of the bridge arm switch of the upper bridge arm of the third phase and the bridge arm switch of the lower bridge arm of the third phase in the first bridge arm of the N-phase that is not directly connected to the positive and negative terminals of the DC power supply.

[0071] The second end of the third phase winding is connected to the neutral point of both the upper and lower bridge arms of the third phase in the second bridge arm of the N-phase system. Here, the neutral point refers to the end of the bridge arm switch of the upper and lower bridge arms of the third phase in the second bridge arm of the N-phase system that is not directly connected to the positive and negative terminals of the DC power supply.

[0072] In this embodiment, the connection between the N-phase windings of the motor and the first N-phase bridge arm of the first inverter and the second N-phase bridge arm of the second inverter is specified. The first ends of the first to third phase windings of the motor are connected to the neutral points of the upper and lower bridge arms of the corresponding phases in the first N-phase bridge arm, respectively, and similarly, the second ends of each phase winding are connected to the neutral points of the upper and lower bridge arms of the corresponding phases in the second N-phase bridge arm. This allows the open-winding motor to effectively switch between different operating modes without additional modifications to the drive system hardware, thereby utilizing the motor's unique structure to maximize its operating efficiency and power output range.

[0073] Figure 2 This is a schematic diagram of another driving system according to an embodiment of the present utility model. Figure 2 As shown, the drive system includes: a first inverter 1, a second inverter 2, a first relay 3 (S1) between the positive DC bus of the first inverter 1 and the second inverter 2, an open-winding motor 4, a second relay 5 (S2) between the negative DC bus of the first inverter 1 and the second inverter 2, and an external high-voltage power supply 6 to supply power to the drive system.

[0074] The first inverter 1 includes three-phase first bridge arms (N=3). Specifically, the upper bridge arm of the first phase of the first inverter 1 includes power switching device Q11, the upper bridge arm of the second phase includes power switching device Q13, and the upper bridge arm of the third phase includes power switching device Q15; the lower bridge arm of the first phase of the first inverter 1 includes power switching device Q12, the lower bridge arm of the second phase includes power switching device Q14, and the lower bridge arm of the third phase includes power switching device Q16.

[0075] The open-winding motor 4 (corresponding to the motor described above) includes a three-phase winding. The first end of the three-phase winding is connected to the neutral point of the first bridge arm of each of the three phases.

[0076] The second inverter 2 includes three-phase second bridge arms, with the neutral points of each bridge arm connected to the second terminals of the three-phase windings. Specifically, the upper bridge arm of the first phase of the second inverter 2 includes power switching device Q21, the upper bridge arm of the second phase includes power switching device Q23, and the upper bridge arm of the third phase includes power switching device Q25; the lower bridge arm of the first phase of the second inverter 2 includes power switching device Q22, the lower bridge arm of the second phase includes power switching device Q24, and the lower bridge arm of the third phase includes power switching device Q26.

[0077] The first relay 3 is connected between the first end of the three-phase first bridge arm of the first inverter 1 and the first end of the three-phase second bridge arm of the second inverter 2; the second relay 5 is connected between the second end of the three-phase first bridge arm of the first inverter 1 and the second end of the three-phase second bridge arm of the second inverter 2.

[0078] In this embodiment, the drive system may include a capacitor C1 (which may be a filter capacitor), which may be connected in parallel with the first inverter 1. Optionally, capacitor C1 may be located inside or outside the first inverter 1. The second inverter 2 may include a capacitor C2 (which may be a filter capacitor) for discharging. It may be connected in parallel with the second inverter 2. Optionally, capacitor C2 may be located inside or outside the second inverter 2.

[0079] Based on the above-mentioned basic circuit structure, this embodiment controls the first relay 3 and the second relay 5 to close or open, and controls the bridge arm switching assembly of the bridge arms of the first inverter 1 and the second inverter 2 to form different connection situations, so that the drive system enters the corresponding working mode.

[0080] The following describes the common bus mode of the drive system in this embodiment.

[0081] As an optional embodiment, the controller is used to control the relays, the first inverter, and the second inverter in response to the control signal corresponding to the common bus mode, so that the drive system operates in the corresponding common bus mode, wherein, in the N-phase first bridge arm, the state of one phase upper bridge arm is the same as the state of the remaining phase lower bridge arms; in the N-phase second bridge arm, the state of two phase upper bridge arms is the same as the state of the remaining phase lower bridge arms; or, in the N-phase first bridge arm, the state of two phase upper bridge arms is the same as the state of the remaining phase lower bridge arms; in the N-phase second bridge arm, the state of one phase upper bridge arm is the same as the state of the remaining phase lower bridge arms; both the first relay and the second relay are in the closed state.

[0082] In this embodiment, the controller responds to the control signal corresponding to the common bus mode and can control the relay, the first inverter and the second inverter to make the drive system operate in the corresponding common bus mode.

[0083] For relays, the controller can put both the first and second relays into the closed state. This means that the positive and negative terminals of the DC buses of the first and second inverters are electrically connected, sharing the same power supply and forming a structure with a shared DC bus.

[0084] In this embodiment, for the first inverter, the controller can control the state of one upper bridge arm in the N-phase first bridge arm to be the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase first bridge arm to be closed, and the state of the remaining lower bridge arms to also be closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase first bridge arm to be closed, and the bridge arm switches of the remaining lower bridge arms to also be closed.

[0085] In this embodiment, for the second inverter, the controller can control the state of two upper-phase bridge arms in the N-phase second bridge arm to be the same as the state of the remaining lower-phase bridge arms. Optionally, the controller can control the state of two upper-phase bridge arms in the N-phase second bridge arm to be closed, and the state of the remaining lower-phase bridge arms to be closed as well. For example, the controller can control the bridge arm switches of two upper-phase bridge arms in the N-phase second bridge arm to be closed, and the bridge arm switches of the remaining lower-phase bridge arms to be closed as well.

[0086] In another embodiment, for the first inverter, the controller can control the state of two upper bridge arms in the N-phase first bridge arm to be the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of two upper bridge arms in the N-phase first bridge arm to be closed, and the state of the remaining lower bridge arms to also be closed. For example, the controller can control the bridge arm switches of two upper bridge arms in the N-phase first bridge arm to be closed, and the bridge arm switches of the remaining lower bridge arms to also be closed.

[0087] In another embodiment, for the second inverter, the controller can control the state of one upper bridge arm in the N-phase second bridge arm to be the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase second bridge arm to be closed, and the state of the remaining lower bridge arms to also be closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase second bridge arm to be closed, and the bridge arm switches of the remaining lower bridge arms to also be closed.

[0088] The states of the first and second N-phase bridge arms in the first and second inverters mentioned above allow the motor windings to receive AC power generated by the half-bridge circuit in each phase, thereby driving the motor to operate in a common bus mode.

[0089] The following description further elaborates on the state of the upper bridge arm of one phase in the first bridge arm of the N phases of this embodiment, which is the same as the state of the lower bridge arms of the other phases.

[0090] As an optional embodiment, in the first N-phase bridge arm, one upper phase bridge arm is in a closed state, the other two lower phase bridge arms are in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, two upper phase bridge arms are in a closed state, the other lower phase bridge arm is in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; wherein, the neutral points corresponding to the two upper phase bridge arms in the closed state in the second N-phase bridge arm, and the neutral points corresponding to the other two lower phase bridge arms in the closed state in the first N-phase bridge arm, are connected to the corresponding two phase windings in the N-phase winding; the neutral points corresponding to the other lower phase bridge arm in the closed state in the second N-phase bridge arm, and the neutral points corresponding to the one upper phase bridge arm in the closed state in the first N-phase bridge arm, are connected to the corresponding one phase winding in the N-phase winding.

[0091] In this embodiment, for the first inverter, in the N-phase first bridge arm, for example, in the three-phase first bridge arm, one upper bridge arm is in a closed state, the other two lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. This can be achieved by the controller controlling the bridge arm switch of one upper bridge arm in the three-phase first bridge arm to close, the bridge arm switches of the other two lower bridge arms to close, and the bridge arm switches of the other bridge arms to open.

[0092] For the second inverter, in the N-phase second bridge arm, two upper bridge arms are in the closed state, the remaining lower bridge arm is in the closed state, and the other bridge arms in the N-phase second bridge arm are all in the open state. This can be achieved by the controller controlling the bridge arm switches of the two upper bridge arms in the N-phase second bridge arm to close, the bridge arm switch of the remaining lower bridge arm to close, and the bridge arm switches of the other bridge arms to open.

[0093] As one possible example, in the first bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state.

[0094] In this embodiment, for the first inverter, the controller can control the upper arm of the first phase of the N-phase first bridge arm to be closed and the lower arm of the first phase to be open; the upper arm of the second phase of the N-phase first bridge arm to be open and the lower arm of the second phase to be closed; and the upper arm of the third phase of the N-phase first bridge arm to be open and the lower arm of the third phase to be closed. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase first bridge arm to be closed and the bridge arm switch of the lower arm of the first phase to be open; the bridge arm switch of the upper arm of the second phase of the N-phase first bridge arm to be open and the bridge arm switch of the lower arm of the second phase to be closed; and the bridge arm switch of the upper arm of the third phase of the N-phase first bridge arm to be open and the bridge arm switch of the lower arm of the third phase to be closed.

[0095] For the second inverter, the controller can control the upper arm of the first phase of the N-phase second bridge arm to be in the open state and the lower arm of the first phase to be in the closed state; the upper arm of the second phase of the N-phase second bridge arm to be in the closed state and the lower arm of the second phase to be in the open state; and the upper arm of the third phase of the N-phase second bridge arm to be in the closed state and the lower arm of the third phase to be in the open state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be open and the bridge arm switch of the lower arm of the first phase to be closed; the bridge arm switch of the upper arm of the second phase of the N-phase second bridge arm to be closed and the bridge arm switch of the lower arm of the second phase to be open; and the bridge arm switch of the upper arm of the third phase of the N-phase second bridge arm to be closed and the bridge arm switch of the lower arm of the third phase to be open.

[0096] Based on the above, the neutral points corresponding to the two upper phase arms in the closed state of the second bridge arm of the N-phase, and the neutral points corresponding to the remaining two lower phase arms in the closed state of the first bridge arm of the N-phase, are connected to the corresponding two phase windings in the N-phase winding. Alternatively, the neutral points corresponding to the two upper phase arms in the closed state of the second bridge arm of the N-phase can be connected to the second ends of the corresponding two phase windings in the N-phase winding, and the neutral points corresponding to the remaining two lower phase arms in the closed state of the first bridge arm of the N-phase can be connected to the first ends of the corresponding two phase windings in the N-phase winding.

[0097] The neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding. Alternatively, the neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding in the N-phase winding, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding in the N-phase winding.

[0098] Based on the above, the bridge arm switching states of the first and second inverters are complementary. That is, in any phase, when the upper bridge arm of one inverter is closed and the lower bridge arm is open, the upper bridge arm of the other inverter is open and the lower bridge arm is closed. This state allows the motor windings to receive AC power generated by the half-bridge circuit in each phase, thereby driving the motor to operate in common bus mode.

[0099] For example, Figure 3(A) is a schematic diagram of a drive system in a common bus configuration according to an embodiment of the present invention. As shown in Figure 3(A), in Figure 2 Based on the drive system shown, both the first relay 3 and the second relay 5 are in the closed state. The aforementioned bridge arm switches can be power switching devices. In the first inverter 1, the power switching device Q11 of the first phase upper bridge arm is in the closed state, the power switching device Q12 of the first phase lower bridge arm is in the open state, the power switching device Q13 of the second phase upper bridge arm is in the open state, the power switching device Q14 of the second phase lower bridge arm is in the closed state, the power switching device Q15 of the third phase upper bridge arm is in the open state, and the power switching device Q16 of the third phase lower bridge arm is in the closed state.

[0100] In the second inverter 2, the power switch Q21 of the first phase upper arm is in the open state, the power switch Q22 of the first phase lower arm is in the closed state, the power switch Q23 of the second phase upper arm is in the closed state, the power switch Q24 of the second phase lower arm is in the open state, the power switch Q25 of the third phase upper arm is in the closed state, and the power switch Q26 of the third phase lower arm is in the open state.

[0101] It should be noted that in the above-described common bus mode, the second inverter of the drive system in this embodiment may also exclude capacitor C2, thereby simplifying the structure of the drive system.

[0102] As an optional embodiment, in the first N-phase bridge arm, two upper phase bridge arms are in a closed state, the remaining lower phase bridge arm is in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, one upper phase bridge arm is in a closed state, the remaining two lower phase bridge arms are in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; wherein, the neutral point corresponding to the closed upper phase bridge arm in the second N-phase bridge arm, and the neutral point corresponding to the remaining lower phase bridge arm in the first N-phase bridge arm, are connected to the corresponding phase winding in the N-phase winding; the neutral points corresponding to the remaining two lower phase bridge arms in the second N-phase bridge arm, and the neutral points corresponding to the two closed upper phase bridge arms in the first N-phase bridge arm, are connected to the corresponding two phase windings in the N-phase winding.

[0103] In this embodiment, for the first inverter, in the N-phase first bridge arm, for example, in the three-phase first bridge arm, two upper bridge arms are in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. This can be achieved by the controller controlling the bridge arm switches of the two upper bridge arms in the N-phase first bridge arm to close, the bridge arm switch of the remaining lower bridge arm to close, and the bridge arm switches of the other bridge arms to open.

[0104] For the second inverter, in the N-phase second bridge arm, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state. This can be achieved by the controller controlling the bridge arm switch of one phase upper bridge arm in the N-phase second bridge arm to close, the bridge arm switches of the other two phase lower bridge arms to close, and the bridge arm switches of the other bridge arms to open.

[0105] As one possible example, in the first bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state.

[0106] In this embodiment, for the first inverter, the controller can control the upper arm of the first phase of the N-phase first bridge arm to be in a closed state, the lower arm of the first phase to be in an open state, the upper arm of the second phase to be in a closed state, the lower arm of the second phase to be in an open state, the upper arm of the third phase to be in an open state, and the lower arm of the third phase to be in a closed state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase first bridge arm to be closed, the bridge arm switch of the lower arm of the first phase to be open, the bridge arm switch of the upper arm of the second phase to be closed, the bridge arm switch of the lower arm of the second phase to be open, the bridge arm switch of the upper arm of the third phase to be open, and the bridge arm switch of the lower arm of the third phase to be closed.

[0107] For the second inverter, the controller can control the upper arm of the first phase of the N-phase second bridge arm to be in the open state, the lower arm of the first phase to be in the closed state, the upper arm of the second phase to be in the open state, the lower arm of the second phase to be in the closed state, the upper arm of the third phase to be in the closed state, and the lower arm of the third phase to be in the open state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be open, the bridge arm switch of the lower arm of the first phase to be closed, the bridge arm switch of the upper arm of the second phase to be open, the bridge arm switch of the lower arm of the second phase to be closed, the bridge arm switch of the upper arm of the third phase to be closed, and the bridge arm switch of the lower arm of the third phase to be open.

[0108] For example, Figure 3(B) is a schematic diagram of a drive system in another common bus configuration according to an embodiment of the present invention. As shown in Figure 3(B), in Figure 2 Based on the drive system shown, both the first relay 3 and the second relay 5 are in the closed state. The aforementioned bridge arm switches can be power switching devices. In the first inverter 1, the power switching device Q11 of the first phase upper bridge arm is in the closed state, the power switching device Q12 of the first phase lower bridge arm is in the open state, the power switching device Q13 of the second phase upper bridge arm is in the closed state, the power switching device Q14 of the second phase lower bridge arm is in the open state, the power switching device Q15 of the third phase upper bridge arm is in the open state, and the power switching device Q16 of the third phase lower bridge arm is in the closed state.

[0109] In the second inverter 2, the power switch Q21 of the first phase upper arm is in the open state, the power switch Q22 of the first phase lower arm is in the closed state, the power switch Q23 of the second phase upper arm is in the open state, the power switch Q24 of the second phase lower arm is in the closed state, the power switch Q25 of the third phase upper arm is in the closed state, and the power switch Q26 of the third phase lower arm is in the open state.

[0110] It should be noted that in the above-described common bus mode, the second inverter in this embodiment may not include capacitor C2, thereby simplifying the structure of the drive system.

[0111] It should be further clarified that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm described above are merely illustrative examples of this utility model and do not represent that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm of this utility model are limited to the states described above. Any state of each phase arm in the N-phase first bridge arm and the state of each phase arm in the N-phase second bridge arm that can realize a drive system in a common busbar mode is within the scope of this utility model, and will not be described in detail here.

[0112] This embodiment, through the controller's control of the first and second relays, as well as the control of the bridge arm switches of the first and second inverters, enables the motor windings to simultaneously draw current from both inverters, improving the flexibility and efficiency of the motor drive. By sharing a DC bus, the first and second inverters can work collaboratively, fully utilizing power supply energy, reducing losses during energy conversion, and thus improving the overall energy efficiency of the drive system.

[0113] The hybrid power supply mode corresponding to the operation of the drive system in this embodiment will be described below.

[0114] As an optional embodiment, the drive system further includes: a first capacitor connected in parallel with the second inverter; a battery connection port for connecting a battery; and a controller for controlling the relay, the first inverter, and the second inverter in response to a control signal corresponding to the hybrid power mode, so that the drive system operates in the corresponding hybrid power mode. In the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms; in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms, to charge the first capacitor; in the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms; in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms, to discharge the first capacitor and the battery; the relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes a first relay, which is in an open state; or, the relay includes a second relay, which is in an open or closed state.

[0115] In this embodiment, in response to the control signal corresponding to the first hybrid power mode, the controller can perform the following control on the relay, the first inverter, and the second inverter to make the drive system operate in the corresponding hybrid power mode.

[0116] Regarding the relays, when the first relay includes both the first relay and the second relay described above, the controller can control both the first and second relays to be in an open state. When the relay includes only the first relay, the first relay can be in an open state. When the relay includes only the second relay, the second relay can be in an open or closed state. That is, in this embodiment, even if one of the relays (the first relay or the second relay) and its associated wiring harness between the first and second inverters is removed, the drive system can still achieve a hybrid power supply mode.

[0117] In this embodiment, capacitor charging can be achieved when the drive system operates in hybrid power mode. Optionally, for the first inverter, in the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase first bridge arm to be closed, and the state of the remaining lower bridge arms to also be closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase first bridge arm to be closed, and the bridge arm switch of the remaining lower bridge arms to also be closed. For the second inverter, in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase second bridge arm to be closed, and the state of the remaining lower bridge arms to also be closed. Based on this, the first capacitor charging (corresponding to...) is achieved. Figure 2 The first capacitor (C2) is connected in parallel with the second inverter. When the first capacitor is charging, the DC sides of the first and second inverters are not directly electrically connected and can be powered independently from different power sources.

[0118] In this embodiment, when the drive system operates in hybrid power mode, the capacitor and the battery connected to the battery connection port can also be discharged. Optionally, when the second relay is open, for the first inverter, in the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the other two lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase first bridge arm to be closed, and the state of the other two lower bridge arms to also be closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase first bridge arm to be closed, and the bridge arm switches of the other two lower bridge arms to also be closed. For the second inverter, in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the other two lower bridge arms. Optionally, the controller can control one phase upper bridge arm in the N-phase second bridge arm to be in a closed state, and the other two phase lower bridge arms to be in a closed state as well. For example, the controller can control one phase upper bridge arm in the N-phase second bridge arm to be closed, and the other two phase lower bridge arms to be closed as well, thereby realizing the discharge of the first capacitor and the battery.

[0119] In this embodiment, to achieve discharge of the capacitor and the battery connected to the battery connection port when the drive system is operating in hybrid power mode, when the second relay is closed, for the first inverter, in the N-phase first bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase first bridge arm to be closed, and the state of the remaining lower bridge arms is also closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase first bridge arm to be closed, and the bridge arm switch of the remaining lower bridge arms is also closed. For the second inverter, in the N-phase second bridge arm, the state of one upper bridge arm is the same as the state of the remaining lower bridge arms. Optionally, the controller can control the state of one upper bridge arm in the N-phase second bridge arm to be closed, and the state of the remaining lower bridge arms is also closed. For example, the controller can control the bridge arm switch of one upper bridge arm in the N-phase second bridge arm to be closed, and the bridge arm switch of the remaining lower bridge arms is also closed, thereby achieving discharge of the first capacitor and the battery.

[0120] The charging of the first capacitor in the hybrid power supply mode of this embodiment will be further described below.

[0121] For the charging of the first capacitor, in the first N-phase bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; the neutral point corresponding to the closed upper bridge arm in the second N-phase bridge arm, and the neutral point corresponding to the closed upper bridge arm in the first N-phase bridge arm, are connected to the corresponding phase winding in the N-phase winding; the neutral points corresponding to the remaining lower bridge arms in the second N-phase bridge arm, and the neutral points corresponding to the remaining lower bridge arms in the first N-phase bridge arm, are connected to the corresponding phase winding in the N-phase winding.

[0122] In this embodiment, for charging the first capacitor, the first inverter can be controlled as follows: In the N-phase first bridge arm of the first inverter, for example, in the three-phase first bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. The controller can control the bridge arm switch of one upper bridge arm in the three-phase first bridge arm to close, the bridge arm switch of the remaining lower bridge arm to close, and the bridge arm switches of the other bridge arms to open.

[0123] The second inverter can be controlled as follows: In the N-phase second bridge arm, one upper bridge arm is in the closed state, the remaining lower bridge arm is in the closed state, and the other bridge arms in the N-phase second bridge arm are all in the open state. Alternatively, the controller can control the bridge arm switch of one upper bridge arm in the N-phase second bridge arm to close, the bridge arm switch of the remaining lower bridge arm to close, and the bridge arm switches of the other bridge arms in the N-phase second bridge arm to open.

[0124] As one possible example, in the first bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state.

[0125] In this embodiment, for the first inverter, the controller can control the upper arm of the first phase of the N-phase first bridge arm to be in a closed state and the lower arm of the first phase to be in an open state; the upper arm of the second phase of the N-phase first bridge arm to be in an open state and the lower arm of the second phase of the N-phase first bridge arm to be in a closed state; the upper arm of the third phase of the N-phase first bridge arm to be in an open state and the lower arm of the third phase of the N-phase first bridge arm to be in an open state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase first bridge arm to be closed and the bridge arm switch of the lower arm of the first phase to be open; the bridge arm switch of the upper arm of the second phase of the N-phase first bridge arm to be open and the bridge arm switch of the lower arm of the second phase of the N-phase first bridge arm to be closed; the bridge arm switch of the upper arm of the third phase of the N-phase first bridge arm to be open and the bridge arm switch of the lower arm of the third phase of the N-phase first bridge arm to be open.

[0126] For the second inverter, the controller can control the upper arm of the first phase of the N-phase second bridge arm to be closed, the lower arm of the first phase of the N-phase second bridge arm to be open, the upper arm of the second phase of the N-phase second bridge arm to be open, the lower arm of the second phase of the N-phase second bridge arm to be closed, and the upper arm of the third phase of the N-phase second bridge arm to be open, and the lower arm of the third phase of the N-phase second bridge arm to be open. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be closed, the bridge arm switch of the lower arm of the first phase of the N-phase second bridge arm to be open, the bridge arm switch of the upper arm of the second phase of the N-phase second bridge arm to be open, the bridge arm switch of the lower arm of the second phase of the N-phase second bridge arm to be closed, and the bridge arm switch of the upper arm of the third phase of the N-phase second bridge arm to be open, and the bridge arm switch of the lower arm of the third phase of the N-phase second bridge arm to be open.

[0127] Based on the above, the neutral point corresponding to the closed upper bridge arm of the N-phase second bridge arm, and the neutral point corresponding to the closed upper bridge arm of the N-phase first bridge arm, are connected to the corresponding phase winding of the N-phase winding. Alternatively, the neutral point corresponding to the closed upper bridge arm of the N-phase second bridge arm can be connected to the second end of the corresponding phase winding of the N-phase winding, and the neutral point corresponding to the closed upper bridge arm of the N-phase first bridge arm can be connected to the first end of the corresponding phase winding of the N-phase winding.

[0128] The neutral points corresponding to the remaining lower phase arm of the N-phase second bridge arm that is in a closed state, and the neutral points corresponding to the remaining lower phase arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding of the N-phase winding. Alternatively, the neutral point corresponding to the remaining lower phase arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding of the N-phase winding, and the neutral point corresponding to the remaining lower phase arm of the N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding of the N-phase winding.

[0129] Based on the above, it is ensured that two phase windings of the motor can obtain current through the closing or opening of the bridge arms of the first inverter and the second inverter, respectively, while the other phase windings of the motor can not participate in the current driving process.

[0130] Furthermore, the drive system in this embodiment includes a first capacitor. This first capacitor can be connected in parallel with the second inverter to achieve charging in a hybrid power supply mode. In the hybrid power supply mode, the first capacitor can act as a floating power source, obtaining or storing energy from the power source connected to the second inverter, enabling the drive system to flexibly utilize the power characteristics of the second inverter and improve overall drive efficiency and power output.

[0131] For example, Figure 4 This is a schematic diagram of a capacitor charging drive system in a hybrid power supply mode according to an embodiment of the present invention. Figure 4 As shown, in Figure 2 Based on the drive system shown, both the first relay 1 and the second relay 5 are in the open state. In the first inverter 1, the power switch Q11 of the first phase upper arm is in the closed state, the power switch Q12 of the first phase lower arm is in the open state, the power switch Q13 of the second phase upper arm is in the open state, the power switch Q14 of the second phase lower arm is in the closed state, the power switch Q15 of the third phase upper arm is in the open state, and the power switch Q16 of the third phase lower arm is in the open state.

[0132] In the second inverter 2, the power switch Q21 of the first phase upper arm is in the closed state, the power switch Q22 of the first phase lower arm is in the open state, the power switch Q23 of the second phase upper arm is in the open state, the power switch Q24 of the second phase lower arm is in the closed state, the power switch Q25 of the third phase upper arm is in the open state, and the power switch Q26 of the third phase lower arm is in the open state, so as to charge the capacitor C2.

[0133] In this embodiment, the hybrid power supply mode controls the states of the bridge arm switches and relays, as well as manages the charging of the first capacitor, thereby achieving efficient and flexible driving of the open-winding motor drive system under complex operating conditions. In the hybrid power supply mode, the motor can obtain current from both the first and second inverters, while the charging state of the first capacitor also provides additional energy reserves.

[0134] The following is a further description of the drive system in the hybrid power supply mode of this embodiment, in which the first capacitor and battery are discharged and the second relay is in the open state.

[0135] As an optional embodiment, when the first capacitor and battery are discharging, the second relay is in an open state. Specifically, in the N-phase first bridge arm, one upper bridge arm is in a closed state, the other two lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. Similarly, in the N-phase second bridge arm, one upper bridge arm is in a closed state, the other two lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state. The neutral point corresponding to the closed upper bridge arm in the N-phase second bridge arm, and the N-phase first bridge arm... The neutral point corresponding to the other lower bridge arm in the N-phase that is in a closed state is connected to the corresponding phase winding in the N-phase winding; the neutral point corresponding to the other lower bridge arm in the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the one upper bridge arm in the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding; the neutral point corresponding to the other lower bridge arm in the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other lower bridge arm in the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding.

[0136] In this embodiment, when the first capacitor and battery are discharging, if the second relay is in the open state, then in the N-phase first bridge arm (for example, in the three-phase first bridge arm), one upper bridge arm is in the closed state, the other two lower bridge arms are in the closed state, and the other bridge arms in the N-phase first bridge arm are all in the open state. Alternatively, the controller can control the bridge arm switch of one upper bridge arm in the three-phase first bridge arm to close, the bridge arm switches of the other two lower bridge arms to close, and the bridge arm switches of the other bridge arms in the N-phase first bridge arm to open.

[0137] For the second inverter, in the N-phase second bridge arm, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state. Alternatively, the controller can control the bridge arm switch of one phase upper bridge arm to be closed, the bridge arm switches of the other two phase lower bridge arms to be closed, and the bridge arm switches of the other bridge arms in the N-phase second bridge arm to be open.

[0138] As one possible example, in the first bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the first bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N-phase is in a closed state; in the second bridge arm of N-phase, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N-phase is in a closed state.

[0139] For the first inverter, the controller can control the upper arm of the first phase of the N-phase first bridge arm to be closed, the lower arm of the first phase of the N-phase first bridge arm to be open, the upper arm of the second phase of the N-phase first bridge arm to be open, the lower arm of the second phase of the N-phase first bridge arm to be closed, the upper arm of the third phase of the N-phase first bridge arm to be open, and the lower arm of the third phase of the N-phase first bridge arm to be closed. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase first bridge arm to be closed, the bridge arm switch of the lower arm of the first phase of the N-phase first bridge arm to be open, the bridge arm switch of the upper arm of the second phase of the N-phase first bridge arm to be open, the bridge arm switch of the lower arm of the second phase of the N-phase first bridge arm to be closed, the bridge arm switch of the upper arm of the third phase of the N-phase first bridge arm to be open, and the bridge arm switch of the lower arm of the third phase of the N-phase first bridge arm to be closed.

[0140] For the second inverter, the controller can control the upper arm of the first phase of the N-phase second bridge arm to be in the open state, the lower arm of the first phase of the N-phase second bridge arm to be in the closed state, the upper arm of the second phase of the N-phase second bridge arm to be in the closed state, the lower arm of the second phase of the N-phase second bridge arm to be in the open state, the upper arm of the third phase of the N-phase second bridge arm to be in the open state, and the lower arm of the third phase of the N-phase second bridge arm to be in the closed state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be open, the bridge arm switch of the lower arm of the first phase of the N-phase second bridge arm to be closed, the bridge arm switch of the upper arm of the second phase of the N-phase second bridge arm to be closed, the bridge arm switch of the lower arm of the second phase of the N-phase second bridge arm to be open, the bridge arm switch of the upper arm of the third phase of the N-phase second bridge arm to be open, and the bridge arm switch of the lower arm of the third phase of the N-phase second bridge arm to be closed.

[0141] Based on the above, the neutral point corresponding to the upper phase arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the lower phase arm of the remaining N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding. Alternatively, the neutral point corresponding to the upper phase arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding in the N-phase winding, and the neutral point corresponding to the lower phase arm of the remaining N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding in the N-phase winding.

[0142] The neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding. Alternatively, the neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding in the N-phase winding, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding in the N-phase winding.

[0143] The neutral point corresponding to the other lower phase arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other lower phase arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding of the N-phase winding. Alternatively, the neutral point corresponding to the other lower phase arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding of the N-phase winding, and the neutral point corresponding to the other lower phase arm of the N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding of the N-phase winding.

[0144] In addition, the drive system of this embodiment also includes a first capacitor. This first capacitor is connected in parallel with the second inverter and is used for discharging in the second hybrid power supply mode. The first capacitor serves as an energy buffer and temporary storage unit, capable of quickly releasing stored energy when needed to supplement the power output of the main power source (such as a battery), especially during instantaneous high power demands, such as during motor acceleration, where it can rapidly provide additional current, enhancing the system's responsiveness and performance.

[0145] For example, Figure 5(A) is a schematic diagram of a capacitor and battery discharge drive system in a hybrid power supply mode according to an embodiment of the present invention. As shown in Figure 5(A), in Figure 2 Based on the drive system shown, both the first relay 1 and the second relay 5 are in the open state. In the first inverter 1, the power switch Q11 of the first phase upper arm is in the closed state, the power switch Q12 of the first phase lower arm is in the open state, the power switch Q13 of the second phase upper arm is in the open state, the power switch Q14 of the second phase lower arm is in the closed state, the power switch Q15 of the third phase upper arm is in the open state, and the power switch Q16 of the third phase lower arm is in the closed state.

[0146] In the second inverter 2, the power switch Q21 of the first phase upper arm is open, the power switch Q22 of the first phase lower arm is closed, the power switch Q23 of the second phase upper arm is closed, the power switch Q24 of the second phase lower arm is open, the power switch Q25 of the third phase upper arm is open, and the power switch Q26 of the third phase lower arm is closed. The high-voltage battery 6 and capacitor C2 are discharging simultaneously.

[0147] Based on the above, each phase winding of the N-phase winding of the motor can generate AC current through an inverter arm. Since the lower arm of the third phase of the first inverter and the lower arm of the third phase of the second inverter are both in a closed state, the third phase winding of the motor can be regarded as shared between the first inverter and the second inverter, which helps to improve system efficiency and power output.

[0148] In this embodiment, the controller ensures that each phase winding of the motor's N-phase winding can draw current from one inverter by controlling the bridge arm switches of the first inverter, the bridge arm switches of the second inverter, and the relays. Simultaneously, the first capacitor, acting as a parallel component of the second inverter, discharges when needed, providing additional peak power, thereby enhancing the dynamic performance and efficiency of the drive system.

[0149] The following is a further description of the drive system in the hybrid power supply mode of this embodiment, in which the first capacitor and battery are discharged and the second relay is in the closed state.

[0150] As another optional embodiment, when the first capacitor and battery are discharging, the second relay is in a closed state. Specifically, in the N-phase first bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase first bridge arm are in an open state. Similarly, in the N-phase second bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase second bridge arm are in an open state. The neutral point corresponding to the closed upper bridge arm in the N-phase second bridge arm, and the neutral point corresponding to the closed lower bridge arm in the N-phase first bridge arm, are connected to the corresponding phase winding in the N-phase winding.

[0151] In this embodiment, when the first capacitor and battery are discharging, if the second relay is in a closed state, then in the N-phase first bridge arm (for example, in a three-phase first bridge arm), one upper bridge arm is in a closed state, the remaining lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. Alternatively, the controller can control the bridge arm switch of one upper bridge arm in the three-phase first bridge arm to be closed, the bridge arm switch of the remaining lower bridge arm to be closed, and the bridge arm switches of the other bridge arms in the N-phase first bridge arm to be open.

[0152] For the second inverter, in the N-phase second bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state. This can be achieved by the controller controlling the bridge arm switch of one upper bridge arm in the N-phase second bridge arm to be closed, the bridge arm switch of the remaining lower bridge arm to be closed, and the bridge arm switches of the other bridge arms in the N-phase second bridge arm to be open.

[0153] As one possible example, in the first bridge arm of N phases, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N phases is in a closed state; in the first bridge arm of N phases, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the first bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N phases is in a closed state.

[0154] For the first inverter, in the first bridge arm of the N-phase system, the upper bridge arm of the first phase is closed, the lower bridge arm of the first phase is open, the upper bridge arm of the second phase is open, the lower bridge arm of the second phase is closed, the upper bridge arm of the third phase is open, and the lower bridge arm of the third phase is open. For example, the controller can control the bridge arm switch of the upper bridge arm of the first phase of the N-phase system to close, the bridge arm switch of the lower bridge arm of the first phase of the N-phase system to open, the bridge arm switch of the upper bridge arm of the second phase of the first phase of the N-phase system to open, the bridge arm switch of the lower bridge arm of the second phase of the first phase of the N-phase system to close, and the bridge arm switch of the upper bridge arm of the third phase of the first phase of the N-phase system to open, and the bridge arm switch of the lower bridge arm of the third phase of the first phase of the N-phase system to open.

[0155] For the second inverter, the controller can control the upper arm of the first phase of the N-phase second bridge arm to be in the open state, the lower arm of the first phase to be in the closed state, the upper arm of the second phase to be in the closed state, the lower arm of the second phase to be in the open state, and the upper arm of the third phase to be in the open state, and the lower arm of the third phase to be in the open state. For example, the controller can control the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be open, control the bridge arm switch of the lower arm of the first phase to be closed, control the bridge arm switch of the upper arm of the second phase to be closed, control the bridge arm switch of the lower arm of the second phase to be open, and control the bridge arm switch of the upper arm of the third phase to be open, and control the bridge arm switch of the lower arm of the third phase to be open.

[0156] Based on the above, the neutral point corresponding to the upper phase arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the lower phase arm of the remaining N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding. Alternatively, the neutral point corresponding to the upper phase arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding in the N-phase winding, and the neutral point corresponding to the lower phase arm of the remaining N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding in the N-phase winding.

[0157] The neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding in the N-phase winding. Alternatively, the neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state can be connected to the second end of the corresponding phase winding in the N-phase winding, and the neutral point corresponding to the other upper bridge arm of the N-phase first bridge arm that is in a closed state can be connected to the first end of the corresponding phase winding in the N-phase winding.

[0158] For example, Figure 5(B) is a schematic diagram of a capacitor and battery discharge drive system in another hybrid power supply mode according to an embodiment of the present invention. As shown in Figure 5(B), in Figure 2Based on the drive system shown, the second relay 5 is in the closed state. In the first inverter 1, the power switch Q11 of the first phase upper arm is in the closed state, the power switch Q12 of the first phase lower arm is in the open state, the power switch Q13 of the second phase upper arm is in the open state, the power switch Q14 of the second phase lower arm is in the closed state, the power switch Q15 of the third phase upper arm is in the open state, and the power switch Q16 of the third phase lower arm is in the open state.

[0159] In the second inverter 2, the power switch Q21 of the first phase upper arm is open, the power switch Q22 of the first phase lower arm is closed, the power switch Q23 of the second phase upper arm is closed, the power switch Q24 of the second phase lower arm is open, the power switch Q25 of the third phase upper arm is open, and the power switch Q26 of the third phase lower arm is open. The high-voltage battery 6 and capacitor C2 are discharging simultaneously.

[0160] In this embodiment, the controller controls the bridge arm switch of the first inverter, the bridge arm switch of the second inverter, and the closing of the second relay. At the same time, the first capacitor, as a parallel component of the second inverter, discharges when needed, thereby achieving the purpose of discharging the first capacitor and the battery, and enhancing the dynamic performance and efficiency of the drive system.

[0161] It should be further clarified that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm described above are merely illustrative examples of this utility model and do not represent that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm of this utility model are limited to the states described above. Any state of each phase arm in the N-phase first bridge arm and the state of each phase arm in the N-phase second bridge arm that can realize a drive system in a hybrid power supply mode is within the scope of this utility model, and will not be described in detail here.

[0162] The following describes the Y-type connection mode corresponding to the operation of the drive system in this embodiment.

[0163] As an optional embodiment, the controller is used to control the relay, the first inverter, and the second inverter in response to the control signal corresponding to the Y-type connection mode, so that the drive system operates in the corresponding Y-type connection mode, wherein in the N-phase first bridge arm, one phase upper bridge arm is in a closed state, and the remaining one phase lower bridge arm is in a closed state, wherein all bridge arms in the N-phase first bridge arm except for one phase upper bridge arm and the remaining one phase lower bridge arm are in an open state; in the N-phase second bridge arm, two phase upper bridge arms are in a closed state, wherein all other bridge arms in the N-phase first bridge arm are in an open state; the relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes a first relay, which is in an open state; or, the relay includes a second relay, which is in an open state.

[0164] In this embodiment, the controller responds to the control signal corresponding to the Y-type connection mode and can control the relay, the first inverter, and the second inverter to make the drive system operate in the corresponding Y-type connection mode.

[0165] Regarding the relays, when the first relay includes both the first relay and the second relay mentioned above, the controller can control both the first and second relays to be in an open state. When the relay includes only the first relay, the first relay can be in an open state. When the relay includes only the second relay, the second relay is in an open state. That is, by removing one of the relays (the first relay or the second relay) and its associated wiring harness between the first inverter and the second inverter, the drive system can still achieve a Y-type connection mode.

[0166] In this embodiment, for the first inverter, in the N-phase first bridge arm, for example, in the three-phase first bridge arm, one upper bridge arm is in a closed state, the remaining lower bridge arm is in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state. This can be achieved by the controller controlling the bridge arm switch of one upper bridge arm in the three-phase first bridge arm to close, the bridge arm switch of the remaining lower bridge arm to close, and the bridge arm switches of the other bridge arms in the N-phase first bridge arm to open.

[0167] For the second inverter, in the N-phase second bridge arm, the two upper bridge arms are in a closed state, while the other bridge arms in the N-phase first bridge arm are all in a closed state. This can be achieved by the controller closing the bridge arm switches of the two upper bridge arms in the N-phase second bridge arm, while opening the other bridge arms.

[0168] As one possible example, in the first bridge arm of N phases, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N phases is in a closed state; in the first bridge arm of N phases, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the first bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the first phase is in a closed state, and the lower bridge arm of the first phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the second phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the second phase of N phases is in a closed state; in the second bridge arm of N phases, the upper bridge arm of the third phase is in a closed state, and the lower bridge arm of the third phase of N phases is in a closed state.

[0169] For the first inverter, the controller controls the upper arm of the first phase of the N-phase first bridge arm to be closed, the lower arm of the first phase of the N-phase first bridge arm to be open, the upper arm of the second phase of the N-phase first bridge arm to be open, the lower arm of the second phase of the N-phase first bridge arm to be closed, and both the upper and lower arms of the third phase of the N-phase first bridge arm to be open. For example, the controller controls the bridge arm switch of the upper arm of the first phase of the N-phase first bridge arm to be closed, the bridge arm switch of the lower arm of the first phase of the N-phase first bridge arm to be open, the bridge arm switch of the upper arm of the second phase of the N-phase first bridge arm to be open, the bridge arm switch of the lower arm of the second phase of the N-phase first bridge arm to be closed, and both the bridge arm switches of the upper and lower arms of the third phase of the N-phase first bridge arm to be open.

[0170] For the second inverter, the controller controls the upper arm of the first phase of the N-phase second bridge arm to be closed, the lower arm of the first phase of the N-phase second bridge arm to be open, the upper arm of the second phase of the N-phase second bridge arm to be closed, the lower arm of the second phase of the N-phase second bridge arm to be open, and both the upper and lower arms of the third phase of the N-phase second bridge arm to be open. For example, the controller controls the bridge arm switch of the upper arm of the first phase of the N-phase second bridge arm to be closed, the bridge arm switch of the lower arm of the first phase of the N-phase second bridge arm to be open, the bridge arm switch of the upper arm of the second phase of the N-phase second bridge arm to be closed, the bridge arm switch of the lower arm of the second phase of the N-phase second bridge arm to be open, and both the upper and lower arms of the third phase of the N-phase second bridge arm to be open.

[0171] Based on the above, the neutral point corresponding to the closed upper bridge arm of the N-phase second bridge arm, and the neutral point corresponding to the closed upper bridge arm of the N-phase first bridge arm, are connected to the corresponding phase winding of the N-phase winding. Alternatively, the neutral point corresponding to the closed upper bridge arm of the N-phase second bridge arm can be connected to the second end of the corresponding phase winding of the N-phase winding, and the neutral point corresponding to the closed upper bridge arm of the N-phase first bridge arm can be connected to the first end of the corresponding phase winding of the N-phase winding.

[0172] The neutral point corresponding to the other upper bridge arm in the closed state of the second bridge arm of the N-phase, and the neutral point of the other lower bridge arm in the closed state of the first bridge arm of the N-phase, are connected to the corresponding phase winding of the N-phase winding. Alternatively, the neutral point corresponding to the other upper bridge arm in the closed state of the second bridge arm of the N-phase can be connected to the second end of the corresponding phase winding of the N-phase winding, and the neutral point of the other lower bridge arm in the closed state of the first bridge arm of the N-phase can be connected to the first end of the corresponding phase winding of the N-phase winding.

[0173] In this embodiment, both the first and second relays are in the off state, or only one of the relays is in the off state. This state of the relays ensures that the DC sides of the two inverters are independent of each other and have no electrical connection. This is a requirement of the Y-connection mode, because in this mode each inverter independently draws energy from its own power source.

[0174] For example, Figure 6 This is a schematic diagram of a drive system in a Y-type connection mode according to an embodiment of the present invention. Figure 6 As shown, in Figure 2 Based on the drive system shown, both the first relay 1 and the second relay 5 are in the open state. In the first inverter 1, the power switch Q11 of the first phase upper arm is in the closed state, the power switch Q12 of the first phase lower arm is in the open state, the power switch Q13 of the second phase upper arm is in the open state, the power switch Q14 of the second phase lower arm is in the closed state, the power switch Q15 of the third phase upper arm is in the open state, and the power switch Q16 of the third phase lower arm is in the open state.

[0175] In the second inverter 2, the power switch Q21 of the first phase upper arm is in the closed state, the power switch Q22 of the first phase lower arm is in the open state, the power switch Q23 of the second phase upper arm is in the closed state, the power switch Q24 of the second phase lower arm is in the open state, the power switch Q25 of the third phase upper arm is in the open state, and the power switch Q26 of the third phase lower arm is in the open state.

[0176] Based on the above, in this embodiment, the two-phase windings of the motor can be supplied with current by the bridge arms of the first inverter and the second inverter, respectively, while the remaining one-phase winding of the motor is connected to the two-phase windings through a neutral point (or common point).

[0177] It should be noted that in the Y-connection mode described above, the second inverter in this embodiment may not include capacitor C2, thereby simplifying the structure of the drive system.

[0178] In this embodiment, the controller ensures that the DC sides of the first inverter and the second inverter are independent of each other by controlling the bridge arm switch of the first inverter, the bridge arm switch of the second inverter, and the relay. This simplifies the system structure and reduces the control complexity while ensuring the basic drive function of the motor, making it suitable for conventional operating conditions that require stable and reliable drive.

[0179] It should be further clarified that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm described above are merely illustrative examples of this utility model and do not represent that the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm of this utility model are limited to the states described above. Any drive system capable of implementing a Y-type connection mode, including the states of each phase arm in the N-phase first bridge arm and the states of each phase arm in the N-phase second bridge arm, falls within the scope of this utility model and will not be described in detail here.

[0180] As an optional embodiment, the drive system further includes a second capacitor connected in parallel with the first inverter.

[0181] In this embodiment, the drive system also includes a second capacitor, which acts as an energy buffer element and is connected in parallel with the first inverter. This means that the second capacitor is directly connected to the DC side of the first inverter and shares the same positive and negative terminals. Because the second capacitor has the ability to store charge, it can absorb and release energy, thereby helping to stabilize the voltage of the first inverter on the DC side.

[0182] Optionally, when the drive system is operating in common bus mode, since the first inverter and the second inverter share a DC power supply, the second capacitor can help balance and stabilize the voltage of the shared power supply, ensuring the stable operation of the first inverter and the motor.

[0183] When the drive system is operating in hybrid power mode, the second capacitor can discharge when needed to provide additional current to the first inverter, or charge when the first inverter outputs current to recover energy.

[0184] When the drive system is running in Y-connection mode, the second capacitor can be used to stabilize the voltage.

[0185] In this embodiment, the second capacitor is connected in parallel with the first inverter, providing the drive system with multiple benefits including voltage stabilization, energy recovery, instantaneous power boost, and power protection.

[0186] This embodiment provides a drive system integrating multiple drive modes. The drive system includes a battery connection port, a first inverter, a motor, a second inverter, at least one relay, and a controller. The first inverter is connected to the battery and can be used to convert the current supplied by the battery. The motor includes an N-phase winding, with the first ends of each N-phase winding connected to the neutral point of a first arm of the N-phase bridge. The second inverter includes an N-phase second arm, with the neutral point of each N-phase second arm connected to the second end of the N-phase winding. Through the above connection configuration between the first inverter, the motor, and the second inverter, an open winding connection can be achieved between the N-phase winding of the motor and the first and second inverters. The drive system also includes a relay connected between the same end of the first N-phase bridge arm and the same end of the second N-phase bridge arm, which can be used to change the connection configuration between the first and second inverters. The controller in the drive system can be used to control the switching action of the relay, the bridge arm of the first inverter, and the bridge arm of the second inverter, thereby enabling the drive system to switch between different operating modes. This achieves the goal of comprehensively optimizing the control of the drive system, avoiding the situation where the efficiency advantage of the drive system can only be exerted under limited conditions and the system power is singular. This achieves the technical effect of improving the control efficiency of the drive system and solves the technical problem of low control efficiency of the drive system.

[0187] The following provides further examples of embodiments of this utility model, specifically using an open-winding motor drive system as an example.

[0188] An open-winding motor drive system mainly consists of three parts: an open-winding motor, two AC / DC converters, and a reducer. Furthermore, depending on the DC power supply method, it can be divided into three categories: common bus type, hybrid power supply type, and Y-connection type.

[0189] Compared to drive systems for Y-connected motors, open-winding motor drive systems offer greater control flexibility and can provide higher drive power and overall efficiency.

[0190] However, the aforementioned different types of open-winding motor drive systems and traditional Y-connected motor drive systems have their own different distributions of high-efficiency operating conditions and power output limits. A single drive system can only leverage its advantages in certain application scenarios and only has a single power level.

[0191] To address the aforementioned technical shortcomings, this invention proposes a drive circuit based on an open-winding motor, achieving compatibility with multiple drive modes, including: single-power common-bus open-winding motor drive (corresponding to the aforementioned common-bus mode), hybrid power supply and floating capacitor open-winding motor drive (corresponding to the aforementioned hybrid power supply mode), and Y-type winding connection motor drive (corresponding to the aforementioned Y-type connection mode). This embodiment can match a suitable drive mode based on the efficiency map differences, power, and different operating points of different drive modes, thereby achieving efficiency optimization and multi-power output.

[0192] The following section introduces the different operating modes of the drive system and their corresponding connection configurations.

[0193] Figure 7 A schematic diagram of an open-winding motor drive system with a common busbar structure according to an embodiment of the present invention is shown. Figure 7 As shown, in Figure 2 Based on the basic circuit structure, closing the first relay 3 (S1) and the second relay 5 (S2) forms an open-winding motor drive system with a common busbar structure, entering the common busbar mode.

[0194] Figure 8 This is a schematic diagram of a hybrid power supply capacitor-type open-winding motor drive system according to an embodiment of the present invention. Figure 8 As shown, the first relay 3 (S1) and the second relay 5 (S2) are disconnected. At this time, the open-winding motor drive system, which is a hybrid power supply capacitor type, enters the hybrid power supply mode.

[0195] Figure 9 This is a schematic diagram of a Y-connected motor drive system according to an embodiment of the present invention. Figure 9 As shown, in Figure 2 In the basic circuit structure, disconnect the first relay 3 (S1) and the second relay 5 (S2), disconnect the power switching device of the upper half bridge arm or the power switching device of the lower half bridge arm of the second inverter 2, and at the same time turn on the power switching device of the other half bridge arm. At this time, a traditional Y-connected motor drive system is formed and enters the Y-connection mode.

[0196] Figure 10 This is a schematic diagram illustrating the high-efficiency range and output capability of an electric system according to an embodiment of the present invention. Figure 10The diagram illustrates the relationship between torque and speed of the drive system under different operating modes. These different operating modes include: operating mode 1′ of the open-winding motor drive system with a common bus structure (corresponding to the common bus mode in the above embodiments); operating mode 2′ of the open-winding motor drive system with a hybrid power supply capacitor (corresponding to the first and second hybrid power supply modes in the above embodiments); and operating mode 3′ of the Y-connected motor drive system (corresponding to the Y-connection mode in the above embodiments). Operating modes 1′, 2′, and 3′ each have their own high-efficiency ranges (corresponding to high-efficiency ranges 11′, 12′, and 13′, respectively) and output capabilities. The drive system can switch between appropriate operating modes at different operating points, thereby improving overall drive efficiency and switching power levels.

[0197] Optionally, this embodiment offers a simplified version of the circuit structure of the aforementioned drive system. As an example, capacitor C2 can be removed. Figure 11 This is a schematic diagram of another driving system according to an embodiment of the present utility model. Figure 11 As shown, it is possible to Figure 2 Based on the drive system shown, removing capacitor C2 can achieve drive operation mode 1' and operation mode 3'.

[0198] As another alternative instance, Figure 12 This is a schematic diagram of another driving system according to an embodiment of the present utility model. Figure 12 As shown, it is possible to Figure 2 Based on the drive system shown, by removing either the first relay 3 (S1) or the second relay 5 (S2) and related wiring harness between the first inverter 1 and the second inverter 2, the above-mentioned working modes 2′ and 3′ can still be achieved.

[0199] This embodiment adds two relays to the open-winding motor drive system, based on... Figure 2 The drive system shown provides a combination of multiple operating modes, thereby achieving optimal overall efficiency of the drive system under various complex working conditions and switching schemes for different power levels. It realizes comprehensive optimized control of the drive system under different operating modes, ensuring that the drive system can achieve the best performance in multiple operating modes. This avoids the drive system's efficiency advantage being only exerted under limited conditions and the system power being singular, thus achieving the technical effect of improving the control efficiency of the drive system and solving the technical problem of low control efficiency of the drive system.

[0200] This utility model embodiment also provides a vehicle, including the drive system of this utility model embodiment.

[0201] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0202] In the several embodiments provided by this utility model, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division forms. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces; the indirect coupling or communication connection of units or modules can be electrical or other forms.

[0203] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0204] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0205] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A drive system, characterized in that, include: The system includes a battery connection port, a first inverter, a motor, a second inverter, at least one relay, and a controller. The first inverter is connected to the battery connection port and includes an N-phase first bridge arm; The motor includes an N-phase winding, and the first end of the N-phase winding is connected to the neutral point of the first bridge arm of the N-phase winding respectively. The second inverter includes an N-phase second bridge arm, the neutral point of which is connected to the second end of the N-phase winding respectively; The relay is connected between the same end of the first bridge arm of the N-phase system and the same end of the second bridge arm of the N-phase system. The controller is connected to the relay, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the relay, the first inverter, and the second inverter to make the drive system operate in a corresponding working mode. The working mode includes at least one of the following: common bus mode, hybrid power supply mode, and Y-type connection mode.

2. The drive system according to claim 1, characterized in that, The relay includes: A first relay is connected between the first end of the first bridge arm of the N-phase and the first end of the second bridge arm of the N-phase, wherein the first end of the first bridge arm of the N-phase is connected to the positive terminal of the DC bus of the first inverter, and the first end of the second bridge arm of the N-phase is connected to the positive terminal of the DC bus of the second inverter. And / or, The second relay is connected between the second end of the first bridge arm of the N-phase and the second end of the second bridge arm of the N-phase, wherein the second end of the first bridge arm of the N-phase is connected to the negative terminal of the DC bus of the first inverter, and the second end of the second bridge arm of the N-phase is connected to the negative terminal of the DC bus of the second inverter.

3. The drive system according to claim 2, characterized in that, The controller is used to control the relay, the first inverter, and the second inverter in response to the control signal corresponding to the common bus mode, so that the drive system operates in the corresponding common bus mode, wherein... In the first bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases; In the second bridge arm of phase N, the states of the upper bridge arms of the two phases are the same as the states of the lower bridge arms of the other phases; or, In the first bridge arm of N phases, the states of the upper bridge arms of the two phases are the same as the states of the lower bridge arms of the other phases; In the second bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases; Both the first relay and the second relay are in the closed state.

4. The drive system according to claim 3, characterized in that, In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the first bridge arm of N phases are in an open state. In the second bridge arm of N phases, the upper bridge arms of two phases are in the closed state, the lower bridge arm of the remaining phase is in the closed state, and the other bridge arms in the second bridge arm of N phases are in the open state. The neutral points corresponding to the two upper bridge arms in the closed state in the second bridge arm of phase N, and the neutral points corresponding to the other two lower bridge arms in the closed state in the first bridge arm of phase N, are connected to the corresponding two phase windings in the winding of phase N. The neutral point corresponding to the lower bridge arm of the remaining phase in the second bridge arm of phase N that is in a closed state, and the neutral point corresponding to the upper bridge arm of the first bridge arm of phase N that is in a closed state, are connected to the corresponding phase winding in the winding of phase N.

5. The drive system according to claim 3, characterized in that, In the first bridge arm of N phases, the upper bridge arms of two phases are in a closed state, the lower bridge arm of the remaining phase is in a closed state, and the other bridge arms in the first bridge arm of N phases are in a closed state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the second bridge arm of N phases are in an open state. The neutral point corresponding to the upper bridge arm of one phase in the second bridge arm of N phase that is in a closed state, and the neutral point corresponding to the lower bridge arm of the other phase in the first bridge arm of N phase that is in a closed state, are connected to the corresponding phase winding in the winding of N phase. The neutral points corresponding to the two lower bridge arms of the N-phase second bridge arm that are in a closed state, and the neutral points corresponding to the two upper bridge arms of the N-phase first bridge arm that are in a closed state, are connected to the corresponding two phase windings in the N-phase winding.

6. The drive system according to claim 2, characterized in that, The drive system further includes: a first capacitor connected in parallel with the second inverter; a battery connection port for connecting a battery; and a controller for controlling the relay, the first inverter, and the second inverter in response to a control signal corresponding to the hybrid power mode, so that the drive system operates in the corresponding hybrid power mode. In the first bridge arm of N phases, the state of one upper bridge arm is the same as the state of the other lower bridge arm. In the second bridge arm of N phases, the state of one upper bridge arm is the same as the state of the other lower bridge arm, so as to charge the first capacitor. In the first bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases. In the second bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases, so as to discharge the first capacitor and the battery. The relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes the first relay, which is in an open state; or, the relay includes the second relay, which is in an open or closed state.

7. The drive system according to claim 6, characterized in that, Regarding the charging of the first capacitor, wherein, In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the second bridge arm of N phases are all in an open state. The neutral point corresponding to the upper bridge arm of one phase in the second bridge arm of N phase that is in a closed state, and the neutral point corresponding to the upper bridge arm of one phase in the first bridge arm of N phase that is in a closed state, are connected to the corresponding winding of one phase in the winding of N phase. The neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other lower bridge arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding of the N-phase winding.

8. The drive system according to claim 6, characterized in that, When the first capacitor and the battery discharge, the second relay is in the off state, wherein, In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other two phase lower bridge arms are in a closed state, and the other bridge arms in the second bridge arm of N phases are all in an open state. The neutral point corresponding to the upper bridge arm of one phase in the second bridge arm of N phase that is in a closed state, and the neutral point corresponding to the lower bridge arm of the other phase in the first bridge arm of N phase that is in a closed state, are connected to the corresponding phase winding in the winding of N phase. The neutral point corresponding to the lower bridge arm of the other phase in the second bridge arm of N phase that is in a closed state, and the neutral point corresponding to the upper bridge arm of the first bridge arm of N phase that is in a closed state, are connected to the corresponding phase winding in the winding of N phase. The neutral point corresponding to the other lower bridge arm of the N-phase second bridge arm that is in a closed state, and the neutral point corresponding to the other lower bridge arm of the N-phase first bridge arm that is in a closed state, are connected to the corresponding phase winding of the N-phase winding.

9. The drive system according to claim 6, characterized in that, When the first capacitor and the battery discharge, the second relay is in a closed state, wherein, In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the second bridge arm of N phases are all in an open state. The neutral point corresponding to the upper bridge arm of one phase in the second bridge arm of N phase that is in a closed state, and the neutral point corresponding to the lower bridge arm of the other phase in the first bridge arm of N phase that is in a closed state, are connected to the corresponding phase winding in the winding of N phase. The neutral point corresponding to the lower bridge arm of the remaining phase in the second bridge arm of phase N that is in a closed state, and the neutral point corresponding to the upper bridge arm of the first bridge arm of phase N that is in a closed state, are connected to the corresponding phase winding in the winding of phase N.

10. The drive system according to claim 2, characterized in that, The controller is used to control the relay, the first inverter, and the second inverter in response to the control signal corresponding to the Y-type connection mode, so that the drive system operates in the corresponding Y-type connection mode, wherein... In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of the N phase, the two upper bridge arms are in a closed state, while the bridge arms in the second bridge arm of the N phase, except for the two upper bridge arms, are all in an open state. The relay includes a first relay and a second relay, both of which are in an open state; or, the relay includes the first relay, which is in an open state; or, the relay includes the second relay, which is in an open state.

11. The drive system according to any one of claims 1 to 10, characterized in that, The drive system also includes: The second capacitor is connected in parallel with the first inverter.

12. A vehicle, characterized in that, Includes the drive system described in any one of claims 1 to 11.

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