An energy conversion device, a motor, a power system and a vehicle

Abstract

The present application provides an energy conversion device, a motor, a power system and a vehicle. The energy conversion device can integrate the motor drive function through a three-phase bridge arm converter and a motor coil, and integrate the AC charging function through a two-phase two-bridge arm converter and a transformer, so that the energy conversion device can integrate the charging function and the motor drive function. When installed on an electric vehicle, it can improve the vehicle integration, simplify the structural layout of the electric vehicle, and reduce the cost and volume of the electric vehicle.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy technology, and in particular to an energy conversion device, a motor, a power system and a vehicle. Background Art

[0002] In the field of energy technology, the charging technology of electric vehicles has always been an important research and development direction for researchers. Electric vehicles not only have charging-related chargers and batteries, but also carry a variety of motors, such as the motor that drives the car and the motor in the air-conditioning compressor. These functional components on electric vehicles are arranged separately, resulting in complex structural layout, low integration, large size and high cost.

[0003] In order to improve the integration of automobiles, simplify the structural layout of electric vehicles, and reduce the cost and size of electric vehicles, it is necessary to integrate the charging function and motor drive function of electric vehicles. Summary of the invention

[0004] The embodiments of the present application provide an energy conversion device, a motor, a power system and a vehicle. The device integrates charging function and motor driving function. When installed on an electric vehicle, it can improve the vehicle integration, simplify the structural layout of the electric vehicle, and reduce the cost and volume of the electric vehicle.

[0005] In the first aspect, an embodiment of the present application provides an energy conversion device, including: a three-phase bridge arm converter, a motor coil, a two-phase two-bridge arm converter and a transformer; the DC end of the three-phase bridge arm converter is connected to a battery; the AC end of the three-phase bridge arm converter is connected to the motor coil; the DC end of the two-phase two-bridge arm converter is connected to the battery; the AC end of the two-phase two-bridge arm converter is connected to the secondary winding of the transformer; and the primary winding of the transformer is connected to the AC charging port.

[0006] The energy conversion device provided in the first aspect of the present application can integrate the motor driving function through a three-phase bridge arm converter and a motor coil, and integrate the AC charging function through a two-phase two-bridge arm converter and a transformer, so that the energy conversion device can integrate the charging function and the motor driving function. When installed on an electric vehicle, it can improve the vehicle's integration, simplify the electric vehicle's structural layout, and reduce the cost and size of the electric vehicle.

[0007] In the second aspect, an embodiment of the present application provides an energy conversion device, including: a three-phase bridge arm converter, a motor coil and a transformer; the DC end of the three-phase bridge arm converter is connected to a battery; the AC end of the three-phase bridge arm converter is connected to the motor coil; two of the bridge arms of the three-phase bridge arm converter are connected to the secondary winding of the transformer through a first switch group, and the first switch group is used to control the connection and disconnection between two of the bridge arms of the three-phase bridge arm converter and the transformer; a second switch group is also provided between two of the bridge arms of the three-phase bridge arm converter and the motor coil, and the second switch group is used to control the connection and disconnection between two of the bridge arms of the three-phase bridge arm converter and the motor coil; the primary winding of the transformer is connected to the AC charging port.

[0008] The energy conversion device provided in the second aspect of the present application can integrate the motor driving function through the three-phase bridge arm converter and the motor coil, realize the AC charging function by reusing two of the bridge arms of the three-phase bridge arm converter, and realize the conversion between the motor driving mode and the AC charging mode through the first switch group and the second switch group. Therefore, the energy conversion device can not only integrate the charging function and the motor driving function, but also reuse part of the circuit, further improve the integration and reduce the volume.

[0009] In combination with the second aspect, in an implementation provided in an embodiment of the present application, the first switch group and the second switch group are composed of a trigger K1 and a trigger K2; one end of the trigger K1 is connected to the AC end of the first bridge arm of the two-phase two-bridge arm converter, and the other end of the trigger K1 includes two contacts, which are respectively connected to the secondary winding of the transformer and the motor coil; one end of the trigger K2 is connected to the AC end of the second bridge arm of the two-phase two-bridge arm converter, and the other end of the trigger K2 includes two contacts, which are respectively connected to the secondary winding of the transformer and the motor coil. This implementation realizes the functions of the first switch group and the second switch group through two triggers, further improves the integration and reduces the volume.

[0010] In the third aspect, an embodiment of the present application provides an energy conversion device, including: a three-phase bridge arm converter, a motor coil, a bridge arm circuit and a transformer; the DC end of the three-phase bridge arm converter is connected to a battery; the AC end of the three-phase bridge arm converter is connected to the motor coil; the AC end of one of the bridge arms of the three-phase bridge arm converter is also connected to the secondary winding of the transformer; the DC end of the bridge arm circuit is connected to the battery; the AC end of the bridge arm circuit is connected to the secondary winding of the transformer; and the primary winding of the transformer is connected to the AC charging port.

[0011] The energy conversion device provided in the third aspect of the present application can integrate the motor driving function through the three-phase bridge arm converter and the motor coil, and realize the AC charging function through the bridge arm circuit and the reuse of one of the bridge arms of the three-phase bridge arm converter. Therefore, the energy conversion device can not only integrate the charging function and the motor driving function, but also reuse part of the circuit, further improve the integration and reduce the volume.

[0012] In conjunction with the third aspect, in an implementation of the embodiment of the present application, the bridge arm circuit is two capacitors connected in series or two diodes connected in series or two switch tubes connected in series. This implementation provides multiple implementation schemes, making the scheme provided by the embodiment of the present application more comprehensive.

[0013] In the fourth aspect, an embodiment of the present application provides an energy conversion device, including a three-phase bridge arm converter, a motor coil and a transformer; the DC end of the three-phase bridge arm converter is connected to a battery; the AC end of the three-phase bridge arm converter is connected to the motor coil; the AC end of one of the bridge arms of the three-phase bridge arm converter is specifically connected to the motor coil through a first switch, and connected to one end of the secondary winding of the transformer through a second switch; the other end of the secondary winding of the transformer is connected to the bus end of the motor coil through a third switch; and the primary winding of the transformer is connected to the AC charging port.

[0014] The energy conversion device provided in the fourth aspect of the present application can integrate the motor driving function through the three-phase bridge arm converter and the motor coil, and realize the AC charging function by reusing the three bridge arms of the three-phase bridge arm converter as a converter. Therefore, the energy conversion device can not only integrate the charging function and the motor driving function, but also reuse part of the circuit, further improve the integration and reduce the volume.

[0015] In conjunction with the fourth aspect, in an implementation of the embodiment of the present application, the first switch and the second switch are specifically a trigger K3; one end of the trigger K3 is connected to the AC end of one of the bridge arms of the three-phase bridge arm converter, and the other end of the trigger K3 includes two contacts, which are respectively connected to one of the windings of the motor coil and one end of the secondary winding of the transformer. This implementation realizes the functions of the first switch and the second switch through one trigger, further improving the integration and reducing the volume.

[0016] In the fifth aspect, an embodiment of the present application provides an energy conversion device, including a three-phase bridge arm converter, a motor coil, a bridge arm circuit and a transformer; the DC end of the three-phase bridge arm converter is connected to a battery; the AC end of the three-phase bridge arm converter is connected to the motor coil; the DC end of the bridge arm circuit is connected to the battery, and the AC end of the bridge arm circuit is connected to one end of the secondary winding of the transformer; the other end of the secondary winding of the transformer is connected to the bus end of the motor coil through a third switch; the primary winding of the transformer is connected to the AC charging port.

[0017] The energy conversion device provided in the fifth aspect of the present application can integrate the motor driving function through the three-phase bridge arm converter and the motor coil, and realize the AC charging function through the bridge arm circuit and the reuse of the three-phase bridge arm converter and the motor coil. Therefore, the energy conversion device can not only integrate the charging function and the motor driving function, but also reuse part of the circuit, further improve the integration and reduce the volume.

[0018] In combination with the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect, in an implementation of the embodiment of the present application, a fourth switch is provided between the primary winding of the transformer and the AC charging port, for controlling the connection and disconnection between the primary winding of the transformer and the AC charging port. This implementation uses the fourth switch to control the connection and disconnection between the primary winding of the transformer and the AC charging port, making the solution provided in the embodiment of the present application more comprehensive.

[0019] In combination with the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect, in an implementation of the embodiment of the present application, an AC filter is provided between the primary winding of the transformer and the AC charging port. This implementation filters the AC power input to the AC charging port through the AC filter, making the solution provided in the embodiment of the present application more comprehensive.

[0020] In combination with the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect, in an implementation of the embodiment of the present application, the transformer is specifically an industrial frequency transformer. In this implementation, the transformer uses an industrial frequency transformer, making the solution provided by the embodiment of the present application more comprehensive.

[0021] In a sixth aspect, an embodiment of the present application provides a motor, the motor comprising a housing, wherein the housing contains an energy conversion device as described in the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect.

[0022] In a seventh aspect, an embodiment of the present application provides a power system, comprising a motor and an energy conversion device such as the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect; the motor coil of the energy conversion device is used to drive the motor.

[0023] In an eighth aspect, an embodiment of the present application provides a vehicle, comprising an energy conversion device as in the first aspect, the second aspect, the third aspect, the fourth aspect or the fifth aspect, or comprising an electric motor as in the sixth aspect, or comprising a power system as in the seventh aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of an energy conversion device provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of an integration method provided in an embodiment of the present application;

[0026] Figure 3a A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0027] Figure 3b A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0028] Figure 4a A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0029] Figure 4b A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0030] Figure 4c A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of another energy conversion device provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of another energy conversion device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The embodiments of the present application provide an energy conversion device, a motor, a power system and a vehicle. The device integrates charging function and motor driving function. When installed on an electric vehicle, it can improve the vehicle integration, simplify the structural layout of the electric vehicle, and reduce the cost and volume of the electric vehicle.

[0034] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "corresponding to" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0036] In order to make the description of the following embodiments clear and concise, a brief introduction to the related technology is first given:

[0037] There are generally two types of solutions for the integration of the charging function and the motor drive function of electric vehicles. One type of solution is a non-isolated integrated charging solution. Non-isolated charging means that there is no transformer to isolate the charging port from the high-voltage battery. In this charging solution, the high-voltage battery and the charging port are directly electrically connected, which poses certain safety risks. Currently, this type of non-isolated charging solution is basically not used in electric vehicles.

[0038] Another type of solution is an isolated integrated charging solution, that is, the voltage conversion circuit between the charging port and the high-voltage battery is isolated by at least one transformer. After the AC input is rectified and then boosted, the latter stage is isolated and transformed to charge the high-voltage battery. This type of isolated charging solution, whether it is a separate charging solution or an integrated charging solution, is the main form of electric vehicle charging at present.

[0039] However, the current solution has low integration, high cost and volume. The present application provides an energy conversion device that integrates charging function and motor drive function. When installed on an electric vehicle, it can improve the integration of the vehicle, simplify the structural layout of the electric vehicle, and reduce the cost and volume of the electric vehicle.

[0040] Figure 1 A schematic diagram of an energy conversion device provided in an embodiment of the present application, the energy conversion device integrates a charging function and a motor driving function. The energy conversion device includes a three-phase bridge arm converter 102, a motor coil 104, a two-phase two-bridge arm converter 103 and a transformer 105. The DC end of the three-phase bridge arm converter 102 is connected to the battery 101, the AC end of the three-phase bridge arm converter 102 is connected to the motor coil 104, the primary winding of the transformer 105 is connected to the AC charging port 106, the secondary winding of the transformer 105 is connected to the AC end of the two-phase two-bridge arm converter 103, and the DC end of the two-phase two-bridge arm converter 103 is connected to the DC end of the three-phase bridge arm converter 102. The following is a detailed introduction to the various components of the energy conversion device:

[0041] 1. Battery 101;

[0042] In the embodiment of the present application, both ends of the battery 101 can be used as output ports or input ports.

[0043] In the embodiment of the present application, the battery 101 can specifically be a high-voltage battery. With the development of electric vehicle technology, the requirements for long-range driving are getting higher and higher, so higher requirements are placed on the capacity of the battery, and the battery voltage is also getting higher and higher. Therefore, more and more electric vehicles use high-voltage batteries to provide energy for vehicle driving. The battery 101 in the embodiment of the present application can be a high-voltage battery, which can be suitable for electric vehicles with higher requirements.

[0044] 2. Three-phase bridge arm converter 102;

[0045] In the embodiment of the present application, the three-phase bridge arm converter 102 can be specifically a three-phase three-bridge arm converter, or a three-phase four-bridge arm converter, etc., which is not limited in the embodiment of the present application. Exemplarily, when the three-phase bridge arm converter 102 is a three-phase three-bridge arm converter, the three-phase bridge arm converter 102 is composed of three bridge arms, and each bridge arm can be two switch tubes connected in series. The port where the three bridge arms are connected in parallel is the DC end of the three-phase bridge arm converter 102, which is used to connect a DC device. In the embodiment of the present application, the DC end of the three-phase bridge arm converter 102 is connected to the battery 101. The intermediate endpoints of each of the three bridge arms are the three AC ends of the three-phase bridge arm converter 102, which are used to connect the motor coil 104. When AC power passes through the motor coil 104, the corresponding motor is driven.

[0046] In some embodiments, the switching tube used by the three-phase bridge arm converter 102 can be a triode with a parallel diode, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), etc., which is not limited to the embodiments of the present application.

[0047] 3. Two-phase two-bridge-arm converter 103;

[0048] In the embodiment of the present application, the two-phase two-bridge-arm converter 103 can be composed of two bridge arms, and each bridge arm can be composed of two switch tubes connected in series. The parallel end of the two bridge arms is the DC end of the two-phase two-bridge-arm converter 103. The DC end of the two-phase two-bridge-arm converter 103 can be connected to the battery 101. The middle endpoints of the two bridge arms are the two AC ends of the two-phase two-bridge-arm converter 103. The two AC ends of the two-phase two-bridge-arm converter 103 are connected to the two ends of the secondary winding of the transformer 105.

[0049] In some embodiments, a power factor correction (PFC) inductor is connected in series between an AC end of the two-phase two-bridge-arm converter 103 and the secondary winding of the transformer 105 to cooperate with the two-phase two-bridge-arm converter 103 to achieve a boost function.

[0050] In the embodiment of the present application, the switch tube used by the two-phase two-bridge arm converter 103 can be a triode, a MOS tube, an IGBT, etc. connected in parallel with a freewheeling diode, and the embodiment of the present application does not limit this. The type of the switch tube used by the two-phase two-bridge arm converter 103 can be the same as the type of the switch tube used by the three-phase bridge arm converter 102, or it can be different, and the embodiment of the present application does not limit this.

[0051] 4. Motor coil 104;

[0052] In the embodiment of the present application, the motor coil 104 is a coil of a motor on an electric vehicle. Specifically, the motor coil 104 may be a stator coil.

[0053] The motor in the embodiment of the present application can be a motor that drives the electric car, or it can be a motor in the compressor of the air conditioner on the electric car. Of course, if there are other similar motors, they are also included in the motors mentioned in the embodiment of the present application. The embodiment of the present application does not limit the type of motor. In fact, since the power of the air conditioner compressor is equivalent to the power of the electric vehicle AC charger, integrating the charger and the compressor can achieve better utilization.

[0054] 5. Transformer 105;

[0055] In the embodiment of the present application, the transformer 105 may be an industrial frequency transformer, which is used to isolate the AC charging port 106 from the battery 101 , so that the AC charging port 106 and the battery 101 are not directly electrically connected, which is safer.

[0056] In the embodiment of the present application, the two ends of the secondary winding of the transformer 105 are connected to the two AC ends of the two-phase two-bridge-arm converter 103, and the primary winding of the transformer 105 is connected to the AC charging port 106, which is used to isolate the AC power input from the AC charging port 106 and transmit it to the two-phase two-bridge-arm converter 103. Then the two-phase two-bridge-arm converter 103 can convert the AC power into DC power and transmit it to the battery 101, thereby charging the battery 101.

[0057] In the embodiment of the present application, the windings of the transformer 105 and the windings of the motor coil 104 should avoid mutual influence as much as possible. In some embodiments, the transformer 105 and the motor coil 104 are integrated together in a motor, and the two are close to each other. Therefore, the embodiment of the present application provides an integration method, such as Figure 2 As shown, mutual influence between the winding of the transformer 105 and the winding of the motor coil 104 is avoided. Figure 2 A schematic diagram of an integrated method provided in an embodiment of the present application. The motor stator corresponding to the motor coil 104 is coaxially aligned with the transformer core corresponding to the transformer 105, the motor coil is wound on the motor stator, and the primary winding and secondary winding of the transformer 105 are wound on the transformer core, so the influence between the winding of the transformer 105 and the winding of the motor coil 104 is small.

[0058] In some embodiments, an AC filter 107 is provided between the primary winding of the transformer 105 and the AC charging port 106 to filter the AC power input from the AC charging port 106. The AC filter 107 is similar to a conventional AC filter device and will not be described in detail herein.

[0059] In some embodiments, a switch 108 is provided between the primary winding of the transformer 105 and the AC charging port 106 to connect or disconnect the energy conversion device and the AC charging port 106. Figure 1 As shown, the switch 108 can be arranged between one end of the primary winding of the transformer 105 and one port of the AC charging port 106. It is understandable that the AC filter 107 and the switch 108 can be arranged between the primary winding of the transformer 105 and the AC charging port 106 at the same time.

[0060] 6. AC charging port 106;

[0061] In the embodiment of the present application, the AC charging port 106 is used to connect to the power grid or the AC charging pile. Exemplarily, after the AC charging port 106 is connected to the AC charging pile, the electric energy in the AC charging pile can be input to the energy conversion device through the AC charging port 106 to charge the battery 101.

[0062] It is understandable that the AC charging port 106 can be in the shape of a standard charging port or in the form of a fast charging port. And the protocol supported by the AC charging port 106 can be a standard charging protocol or a fast charging protocol for electric vehicles. The embodiment of the present application does not limit the shape, size, supported protocols, etc. of the AC charging port 106.

[0063] In the embodiment of the present application, an AC filter 107 may be provided between the AC charging port 106 and the transformer 105. The AC filter 107 is similar to other AC filtering devices and will not be described in detail here.

[0064] In the embodiment of the present application, a switch 108 may be provided between the AC charging port 106 and the transformer 105 to control the conduction and disconnection between the AC charging port 106 and the transformer 105 .

[0065] In the embodiment of the present application, the AC filter 107 and the switch 108 can be provided at the same time, and the embodiment of the present application does not limit this.

[0066] Figure 3aA schematic diagram of another energy conversion device provided in an embodiment of the present application. The energy conversion device includes a battery 301, a three-phase bridge arm converter 302, a motor coil 303, a transformer 304, and an AC charging port 305; the DC end of the three-phase bridge arm converter 302 is connected to the battery 301, the AC end of the three-phase bridge arm converter 302 is connected to the motor coil 303, the primary winding of the transformer 304 is connected to the AC charging port 305, and the secondary winding of the transformer 304 is connected to two of the bridge arms of the three-phase bridge arm converter 302. The following is a detailed introduction to the various components of the energy conversion device:

[0067] In the embodiment of the present application, the battery 301 is Figure 1 The battery 101 in each corresponding embodiment is similar and will not be described again here.

[0068] In the embodiment of the present application, the three-phase bridge arm converter 302 can be specifically a three-phase three-bridge arm converter, or a three-phase four-bridge arm converter, etc., which is not limited in the embodiment of the present application. Exemplarily, when the three-phase bridge arm converter 302 is a three-phase three-bridge arm converter, the three-phase bridge arm converter 302 is composed of three bridge arms, and each bridge arm can be two switch tubes connected in series. The port where the three bridge arms are connected in parallel is the DC end of the three-phase bridge arm converter 302, which is used to connect a DC device. In the embodiment of the present application, the DC end of the three-phase bridge arm converter 302 is connected to the battery 301. The intermediate endpoints of each of the three bridge arms are the three AC ends of the three-phase bridge arm converter 302, which are used to connect the motor coil 303. When AC power passes through the motor coil 303, the corresponding motor is driven.

[0069] In some embodiments, the switch tube used by the three-phase bridge arm converter 302 can be a triode with a parallel diode, a metal-oxide-semiconductor field-effect transistor (MOSFET), an IGBT, etc., which is not limited in the embodiments of the present application.

[0070] In addition, in the embodiment of the present application, two of the bridge arms of the three-phase bridge arm converter 302 can also be used as two bridge arms of the inverter, that is, two of the bridge arms of the three-phase bridge arm converter 302 can be connected to the secondary winding of the transformer 304 to invert the DC power at the DC end into AC power and transmit it to the transformer 304. Therefore, the three-phase bridge arm converter 302 in the embodiment of the present application has two functions. One is that it can provide electrical energy to the motor coil 303 as a three-phase inverter through three bridge arms, and the other is that it can transmit electrical energy to the transformer 304 as a two-phase inverter. In actual applications, the three-phase bridge arm converter 302 can provide selection for the above two functions through two switch groups (the first switch group 307 and the second switch group 308), such as Figure 3aAs shown, two of the bridge arms of the three-phase bridge arm converter 302 can be connected to the secondary winding of the transformer 304 through the first switch group 307, and connected to the motor coil 303 (specifically, the two windings of the motor coil 303) through the second switch group 308.

[0071] exist Figure 3a In the embodiment, when the energy conversion device is in the AC charging mode, the first switch group 307 can be turned on and the second switch group 308 can be turned off. Then, the AC power inputted by the AC charging port 305 is transformed by the transformer 304, and then converted into DC power by the first switch group 307 and two of the bridge arms of the three-phase bridge arm converter 302 to charge the battery 301. At the same time, since the second switch group 308 is disconnected, the current on the three-phase bridge arm converter 302 will not affect the motor coil 303. When the AC charging port 305 is not connected to the charging pile, but to the electrical equipment, the electric energy in the battery 301 can be converted into AC power by two of the bridge arms of the three-phase bridge arm converter 302 to charge / power the equipment connected to the AC charging port 305. When the energy conversion device is in the motor drive mode, the first switch group 307 can be disconnected and the second switch group 308 can be turned on, so that the electric energy in the battery 301 can be transmitted to the motor coil 303 through the three-phase bridge arm converter 302 and the second switch group 308. However, since the first switch group 307 is disconnected, the electric energy input from the AC charging port cannot enter the three-phase bridge arm converter 302.

[0072] In other embodiments, the energy conversion device may use a trigger K1 and a trigger K2 to replace the first switch group 307 and the second switch group 308, such as Figure 3b As shown. The AC end of the leftmost bridge arm of the three-phase bridge arm converter 302 is connected to one end of the trigger K1, and the other end of the trigger K1 has two contacts, which are respectively connected to the leftmost winding of the motor coil 303 and the secondary winding of the transformer 304. The AC end of the rightmost bridge arm of the three-phase bridge arm converter 302 is connected to a section of the trigger K2, and the other end of the trigger K2 has two contacts, which are respectively connected to the rightmost winding of the motor coil 303 and the secondary winding of the transformer 304. Figure 3bIn the embodiment, when the energy conversion device is in the AC charging mode, when the trigger K1 and the trigger K2 both contact the upper contact, the AC ends of the left and right bridge arms of the three-phase bridge arm converter 302 are connected to the secondary winding of the transformer 304, and the AC power input by the AC charging port 305 is transformed by the transformer 304, and then converted into DC power by the trigger K1, the trigger K2 and the three-phase bridge arm converter 302 to charge the battery 301. When the AC charging port 305 is not connected to the charging pile, but to the power-consuming device, the power in the battery 301 can be converted into AC power by two of the bridge arms of the three-phase bridge arm converter 302 to charge / power the device connected to the AC charging port 305. In another case, when the energy conversion device is in the motor driving mode and the trigger K1 and the trigger K2 both contact the lower contacts, the AC ends of the left and right bridge arms of the three-phase bridge arm converter 302 are connected to the motor coil 303, and the AC end of the middle bridge arm of the three-phase bridge arm converter 302 is also connected to the motor coil 303, so that the electric energy output by the battery 301 can be transmitted to the motor coil 303 through the three-phase bridge arm converter 302 to drive the motor.

[0073] exist Figure 3a or Figure 3b In the corresponding embodiment, the AC charging port 305 can also be connected to the primary winding of the transformer 304 through the AC filter 306 and the trigger K3. The AC filter 306 and the trigger K3 are connected to the primary winding of the transformer 304 through the AC filter 306 and the trigger K3. Figure 1 The AC filter 107 and the switch 108 in the corresponding embodiments are similar and will not be described in detail here.

[0074] In the embodiment of the present application, the trigger K1 and the trigger K2 can be replaced by a single-pole double-throw switch, and the trigger K3 can also be replaced by other switches, which is not limited in the embodiment of the present application.

[0075] Figure 4a Schematic diagram of another energy conversion device provided in an embodiment of the present application. The energy conversion device includes a battery 401, a three-phase bridge arm converter 402, a bridge arm circuit 403, a motor coil 404, a transformer 405, and an AC charging port 406; wherein the battery 401 and the aforementioned Figure 1 The battery 101 in each corresponding embodiment is similar and will not be described again here. The connection between the three-phase bridge arm converter 402 and the motor coil 404 is the same as that described above. Figure 1 The connection between the three-phase bridge arm converter 102 and the motor coil 104 in the corresponding embodiments is similar and will not be repeated here.

[0076] In the embodiment of the present application, one of the bridge arms of the three-phase bridge arm converter 402 (in Figure 4aIn the example shown in FIG. 1 , it is the leftmost bridge arm, and in actual application, it may be other bridge arms, which is not limited in the embodiment of the present application) and is also connected to the secondary winding of the transformer 405.

[0077] In the embodiment of the present application, the DC end of the bridge arm circuit 403 is connected in parallel with the DC end of the three-phase bridge arm converter 402, and the AC end of the bridge arm circuit 403 is connected to the secondary winding of the transformer 405. In some embodiments, the bridge arm circuit 403 is composed of two switch tubes connected in series, such as Figure 4a The bridge arm circuit 403 is composed of triodes. In practical applications, the bridge arm circuit 403 can also be composed of diodes connected in series, such as Figure 4b Alternatively, the bridge arm circuit 403 may be composed of capacitors connected in series, such as Figure 4c shown.

[0078] The energy conversion device provided in the embodiment of the present application can realize an AC charging mode, that is, the AC power input by the AC charging port 406 can be rectified by one of the bridge arms of the three-phase bridge arm converter 402 and the bridge arm circuit 403, and output DC power to the battery 401, thereby charging the battery 401.

[0079] The energy conversion device provided in the embodiment of the present application can realize the motor driving mode, that is, the battery 401 outputs DC power to the three-phase bridge arm converter 402, which is inverted into three-phase AC power and then transmitted to the motor coil 404 to drive the motor.

[0080] Figure 4a and Figure 4c The energy conversion device provided in the corresponding embodiment can realize the inverter mode, that is, the DC power output by the battery 401 can be inverted through one of the bridge arms of the three-phase bridge arm converter 402 and the bridge arm circuit 403, and output to the AC charging port 406 to charge / power the device connected to the AC charging port 305.

[0081] In practical applications, such as Figure 4a , Figure 4b and Figure 4c Corresponding embodiments may set appropriate switches (such as triggers, relays, etc.) at relevant connections to control the switching of the above modes, and the embodiments of the present application are not limited to this.

[0082] exist Figure 4a , Figure 4b and Figure 4c In the corresponding embodiment, the AC charging port 406 can also be connected to the transformer 405 through the AC filter 407 and the trigger 408, and the AC filter 407 and the trigger 408 are connected to the above Figure 1 The AC filter 107 and the switch 108 in the corresponding embodiments are similar and will not be described in detail here.

[0083] Figure 5 Schematic diagram of another energy conversion device provided in an embodiment of the present application. The energy conversion device includes a battery 501, a three-phase bridge arm converter 502, a motor coil 503, a transformer 504, and an AC charging port 505; wherein the battery 501 and the aforementioned Figure 1 The battery 101 in each corresponding embodiment is similar and will not be described again here. The connection between the three-phase bridge arm converter 502 and the motor coil 503 is the same as that described above. Figure 1 The relevant descriptions in the corresponding embodiments are similar and will not be repeated here.

[0084] In the embodiment of the present application, the bus terminal of the motor coil 503 is also connected to the secondary winding of the transformer 504 through the switch K2. In practical applications, the switch K2 can be a trigger, a relay, etc., which is not limited in the embodiment of the present application. In addition, the AC end of the rightmost bridge arm of the three-phase bridge arm converter 502 is respectively connected to the motor coil 503 and the secondary winding of the transformer 504 through the switch K1. Specifically, one end of the switch K1 is connected to the AC end of the rightmost bridge arm of the three-phase bridge arm converter 502, and the other end has two contacts, which are respectively connected to the motor coil 503 and the secondary winding of the transformer 504. The switch K1 can be a trigger or a single-pole double-throw switch, etc., which is not limited in the embodiment of the present application.

[0085] The AC charging port 505 can also be connected to the primary winding of the transformer 504 through an AC filter 506 and a trigger K3. The AC filter 506 and the trigger K3 are connected to the primary winding of the transformer 504. Figure 1 The AC filter 107 and the switch 108 in the corresponding embodiments are similar and will not be described in detail here.

[0086] Figure 5 When the energy conversion device shown is operated in the AC charging mode, the switch K1 is connected to the upper contact, the switch K2 is closed, and the switch K3 is closed, then the AC power inputted by the AC charging port 505 can be transformed by the transformer 504, and then rectified into DC power by the left bridge arm, the middle bridge arm, and the right bridge arm of the three-phase bridge arm converter 502, and then transmitted to the battery 501 to charge the battery 501. At this time, if the AC charging port 505 is not connected to the charging pile, but to the power-consuming device, the power in the battery 501 can be converted into AC power by the three-phase bridge arm converter 502 to charge / power the device connected to the AC charging port 505.

[0087] Figure 5 When the energy conversion device shown operates in the motor drive mode, the switch K1 connects the lower contact, the switch K2 is disconnected, and the switch K3 is disconnected, then the electric energy output by the battery 501 is output to the motor coil 503 through the three-phase bridge arm converter 502 to drive the motor.

[0088] In the embodiment of the present application, the left winding and the middle winding of the motor coil 503 can act as an energy storage inductor (also called a power factor correction (PFC) inductor) in the AC charging mode. In the motor driving mode, the winding of the motor coil 503 is used as the coil of the drive motor according to the traditional scheme. Therefore, the embodiment of the present application not only reuses the bridge arm of the three-phase bridge arm converter 502, but also reuses the winding of the motor coil 503, further improving the integration and reducing the volume of the energy conversion device.

[0089] Figure 6 Schematic diagram of another energy conversion device provided in an embodiment of the present application. The energy conversion device includes a battery 601, a three-phase bridge arm converter 602, a bridge arm circuit 603, a motor coil 604, a transformer 605 and an AC charging port 606; wherein the battery 601 and the aforementioned Figure 1 The battery 101 in each corresponding embodiment is similar and will not be described again here. The connection between the three-phase bridge arm converter 602 and the motor coil 604 is the same as that described above. Figure 1 The connection between the three-phase bridge arm converter 102 and the motor coil 104 in the corresponding embodiments is similar and will not be repeated here.

[0090] In the embodiment of the present application, the DC end of the bridge arm circuit 603 is connected to the battery 601, and the AC end of the bridge arm circuit 603 is connected to the secondary winding of the transformer 605. Specifically, one end of the secondary winding of the transformer 605 is connected to the bus terminal of the motor coil 604 through the switch K2, and the other end of the secondary winding of the transformer 605 is connected to the AC end of the bridge arm circuit 603.

[0091] It is understandable that the bridge arm circuit 603 can be composed of a series-connected switch tube, a diode or a capacitor, and the embodiment of the present application is not limited to this.

[0092] In the embodiment of the present application, the AC charging port 606 can also be connected to the primary winding of the transformer 504 through the AC filter 506 and the trigger K3. The AC filter 506 and the switch K3 are connected to the primary winding of the transformer 504 through the AC filter 506 and the trigger K3. Figure 1 The AC filter 107 and the switch 108 in the corresponding embodiments are similar and will not be described in detail here.

[0093] In the embodiment of the present application, the switch K2 and the switch K3 may be triggers, relays, etc., which is not limited in the embodiment of the present application.

[0094] Figure 6When the energy conversion device shown is operated in the AC charging mode, the switch K2 and the switch K3 are closed, and the AC power inputted by the AC charging port 606 is transformed (stepped up or down) by the transformer 605, and then rectified into DC power by the three bridge arms of the three-phase bridge arm converter 602 and the bridge arm circuit 603, and then transmitted to the battery 601 to charge the battery 601. At this time, if the AC charging port 606 is not connected to the charging pile, but to the power-consuming device, the power in the battery 601 can be converted into AC power by the three-phase bridge arm converter 602 and the bridge arm circuit 603, and the device connected to the AC charging port 606 can be charged / powered.

[0095] Figure 6 When the energy conversion device shown is operated in the motor driving mode, the switch K2 and the switch K3 are disconnected, and the DC power output by the battery 601 is transmitted to the motor coil 604 through the three-phase bridge arm converter 602 to realize the motor driving.

[0096] It is understandable that when the energy conversion device performs AC charging mode, the energy conversion device reuses the bridge arm of the three-phase bridge arm converter 602 and the winding of the motor coil 604, thereby improving the integration and reducing the size of the energy conversion device.

[0097] The present application also provides a motor including a housing, wherein the housing has a Figure 1 , Figure 3a , Figure 3b , Figure 4a , Figure 4b , Figure 4c , Figure 5 or Figure 6 The energy conversion device shown.

[0098] The present application also provides a power system, including a motor and Figure 1 , Figure 3a , Figure 3b , Figure 4a , Figure 4b , Figure 4c , Figure 5 or Figure 6 The energy conversion device shown, the motor coil of the energy conversion device is used to drive the motor.

[0099] The present application also provides a vehicle, including: Figure 1 , Figure 3a , Figure 3b , Figure 4a , Figure 4b , Figure 4c , Figure 5 or Figure 6 The energy conversion device shown may include the power system mentioned above.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0101] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy conversion device, characterized in that, it comprises: a three-phase bridge arm converter, a motor coil and a transformer; the DC terminal of the three-phase bridge arm converter is connected to a battery; the AC terminal of the three-phase bridge arm converter is connected to the motor coil; two of the bridge arms of the three-phase bridge arm converter are connected to the secondary winding of the transformer through a first switch group, and the first switch group is used to control the connection and disconnection between two of the bridge arms of the three-phase bridge arm converter and the transformer; a second switch group is further arranged between two of the bridge arms of the three-phase bridge arm converter and the motor coil, and the second switch group is used to control the connection and disconnection between two of the bridge arms of the three-phase bridge arm converter and the motor coil; the primary winding of the transformer is connected to an AC charging port.

2. The energy conversion device according to claim 1, characterized in that, the first switch group and the second switch group are composed of a trigger K1 and a trigger K2; one end of the trigger K1 is connected to the AC terminal of the first bridge arm of the three-phase bridge arm converter, and the other end of the trigger K1 includes two contacts, which are respectively connected to the secondary winding of the transformer and the motor coil; one end of the trigger K2 is connected to the AC terminal of the second bridge arm of the three-phase bridge arm converter, and the other end of the trigger K2 includes two contacts, which are respectively connected to the secondary winding of the transformer and the motor coil.

3. An energy conversion device, characterized in that, it comprises: a three-phase bridge arm converter, a motor coil, a bridge arm circuit and a transformer; the DC terminal of the three-phase bridge arm converter is connected to a battery; the AC terminal of the three-phase bridge arm converter is connected to the motor coil; the AC terminal of one of the bridge arms of the three-phase bridge arm converter is further connected to the secondary winding of the transformer; the DC terminal of the bridge arm circuit is connected to the battery; the AC terminal of the bridge arm circuit is connected to the secondary winding of the transformer; the primary winding of the transformer is connected to an AC charging port.

4. The energy conversion device according to claim 3, characterized in that, the bridge arm circuit is two series-connected capacitors or two series-connected diodes or two series-connected switching tubes.

5. An energy conversion device, characterized in that, it comprises a three-phase bridge arm converter, a motor coil and a transformer; the DC terminal of the three-phase bridge arm converter is connected to a battery; the AC terminal of the three-phase bridge arm converter is connected to the motor coil; the AC terminal of one of the bridge arms of the three-phase bridge arm converter is specifically connected to the motor coil through a first switch and connected to one end of the secondary winding of the transformer through a second switch; the other end of the secondary winding of the transformer is connected to the busbar end of the motor coil through a third switch; the primary winding of the transformer is connected to an AC charging port.

6. The energy conversion device according to claim 5, characterized in that, the first switch and the second switch are specifically a trigger K3; one end of the trigger K3 is connected to the AC terminal of one of the bridge arms of the three-phase bridge arm converter, and the other end of the trigger K3 includes two contacts, which are respectively connected to one of the windings of the motor coil and one end of the secondary winding of the transformer.

7. The energy conversion device according to any one of claims 1 to 6, characterized in that, a fourth switch is provided between the primary winding of the transformer and the AC charging port for controlling the connection and disconnection between the primary winding of the transformer and the AC charging port.

8. The energy conversion device according to any one of claims 1 to 6, characterized in that, an AC filter is provided between the primary winding of the transformer and the AC charging port.

9. The energy conversion device according to any one of claims 1 to 6, characterized in that, the transformer is specifically a power frequency transformer.

10. A motor, characterized in that, the motor includes a housing, and the housing accommodates the energy conversion device according to any one of claims 1 to 9.

11. A power system, characterized in that, it includes a motor and the energy conversion device according to any one of claims 1 to 9; the motor coil of the energy conversion device is used to drive the motor.

12. A vehicle, characterized in that, it includes the energy conversion device according to any one of claims 1 to 9 or includes the motor according to claim 10 or includes the power system according to claim 11.

Images