Power system, power conversion device, and vehicle

Abstract

Disclosed are an electric power system, an electric power conversion device, and a vehicle, the electric power system configured to receive electric power from an external power supply module, the electric power system comprising: an energy storage unit, a motor, a power conversion unit, and a switch module; wherein the electric power system is selectively in one of a motor driving mode and an alternating current charging mode based on the configuration of the switch module, and when the electric power system is in the alternating current charging mode, the electric power system is charged. The switch module is configured to charge the energy storage unit from an external power supply module via a plurality of power converters in the power conversion unit, and when the power system is in a motor driving mode, the switch module is configured to charge the energy storage unit via the plurality of power converters in the power conversion unit. The switching module is configured to power the electric machine from the energy storage unit via the plurality of power converters.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and more specifically to an electric power system, an electric power conversion device and a vehicle. Background Art

[0002] With the widespread application of power technology in civil and commercial fields, power systems are also facing higher requirements. At present, in power systems, various modules are usually simply physically stacked together, and the electrical components in each module are still isolated from each other.

[0003] Such a power system setting means that the electrical components in a module of the power system can only be used by the module and cannot be reused in other modules. This leads to a complex circuit structure and a large circuit size of the power system, low integration and reuse between modules, and high manufacturing costs.

[0004] Therefore, there is a need for a method that can further realize the cross-module integration and reuse of electrical components in the power system under the premise of achieving good power supply, so that according to the actual use requirements and working modes of the electrical system, multiple electrical components in the power system can be flexibly called and reused to realize corresponding functions, thereby achieving high system integration, streamlining circuit structure, and reducing manufacturing costs. Summary of the invention

[0005] In view of the above problems, the present invention provides a power system, a power conversion device and a vehicle. The power system provided by the present invention can further realize the integration and reuse of electrical components across modules in the power system under the premise of achieving good power supply. According to the actual use requirements and working mode of the electrical system, multiple electrical components in the power system can be flexibly called and reused to realize corresponding functions, and the power system has a high degree of integration, a simple circuit structure and a low manufacturing cost.

[0006] According to one aspect of the present invention, a power system is proposed, which is configured to receive power from an external power supply module, and includes: an energy storage unit, a motor, a power conversion unit and a switch module; wherein, based on the configuration of the switch module, the power system is selectively in one of a motor drive mode and an AC charging mode, and when the power system is in the AC charging mode, the switch module is configured to charge the energy storage unit from the external power supply module via multiple power converters in the power conversion unit, and when the power system is in the motor drive mode, the switch module is configured to supply power to the motor from the energy storage unit via the multiple power converters.

[0007] In some embodiments, each of the power converters includes a control switch for controlling the operation of the power converter, and the control switches in each power converter can be controlled independently of each other.

[0008] In some embodiments, the power conversion unit includes three power converters, namely a first power converter, a second power converter, and a third power converter.

[0009] In some embodiments, in the motor driving mode, the switching module is configured to electrically connect the three power converters of the power conversion unit to the energy storage unit respectively to receive direct current from the energy storage unit and respectively output alternating current for corresponding phases of the motor.

[0010] In some embodiments, the switching module electrically connects the first end and the second end of each of the three power converters to the first end and the second end of the energy storage unit, respectively, and the switching module electrically connects the midpoint of at least one bridge arm of each of the three power converters to the corresponding phases of the motor, respectively.

[0011] In some embodiments, in the AC charging mode, the switch module is configured to connect the power conversion unit to a transformer to form an AC charging circuit, so that an external power supply module charges the energy storage unit through the AC charging circuit.

[0012] In some embodiments, the switch module is configured to electrically connect the midpoint of at least one bridge arm of the first power converter to the output end of an external power supply module via at least one corresponding inductor; to electrically connect the midpoint of at least one bridge arm of the second power converter to the corresponding input end of the transformer of the power system, and to electrically connect the output end of the transformer to the midpoint of at least one bridge arm of the third power converter; and wherein the switch module is configured to connect the first end of the first power converter to the first end of the second power converter; to connect the second end of the first power converter to the second end of the second power converter; and to connect the first end of the third power converter to the first end of the energy storage unit, and to connect the second end of the third power converter to the second end of the energy storage unit.

[0013] In some embodiments, the power converter is a three-phase power converter, and each three-phase power converter includes: a first upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end is electrically connected to the first upper arm control end; a first lower arm control switch, a first end of which is electrically connected to the second end of the first upper arm control switch, a second end of which is electrically connected to the second end of the three-phase power converter, and a control end is electrically connected to the first lower arm control end; a second upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end is electrically connected to the second upper arm control end; a second lower arm control switch, a first end of which is electrically connected to the second end of the second upper arm control switch, a second end of which is electrically connected to the second end of the three-phase power converter, and a control end is electrically connected to the second lower arm control end; a third upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end is electrically connected to the third upper arm control end; a third lower arm control switch, a first end of which is electrically connected to the second end of the third upper arm control switch, a second end of which is electrically connected to the second end of the three-phase power converter, and a control end is electrically connected to the third lower arm control end.

[0014] In some embodiments, the control switch is an insulated gate bipolar transistor or a silicon carbide transistor.

[0015] According to another aspect of the present invention, a power conversion device is provided, comprising the power system as described above.

[0016] According to another aspect of the present invention, a vehicle is provided, comprising the power conversion device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The following drawings are not deliberately scaled according to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0018] Figure 1 1 shows a schematic block diagram of a power system 100 according to an embodiment of the present disclosure;

[0019] Figure 2 : A circuit diagram of an example of a power system 100 according to an embodiment of the present disclosure is shown;

[0020] Figure 3 It is shown in Figure 2 A circuit diagram of an example power system 100 in a motor drive mode;

[0021] Figure 4 It is shown in Figure 2 0 is a circuit diagram of an example power system 100 in an AC charging mode. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present invention.

[0023] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0024] According to one aspect of the present disclosure, a power system 100 is provided, which is configured to receive power from an external power supply module 200 . Figure 1 A schematic block diagram of a power system 100 according to an embodiment of the present disclosure is shown.

[0025] Reference Figure 1 The power system 100 includes: an energy storage unit 110, a motor 120, a power conversion unit 130 and a switch module 140.

[0026] The energy storage unit 110 refers to a unit for storing electric energy, which may be, for example, a direct current power supply, or may also be other forms of electric energy storage units, such as a power battery.

[0027] According to the actual use scenario, the motor 120 can be, for example, a DC motor or an AC motor. It should be understood that the embodiments of the present disclosure are not limited by the specific type of the motor.

[0028] The power conversion unit 130 refers to a unit for realizing power and / or electric power conversion in the power supply process of the power system. The power conversion module may include, for example, a plurality of power converters to realize power and / or electric power conversion.

[0029] For example, the power converter may be a three-phase inverter, or other components may be selected according to actual needs. It should be understood that the embodiments of the present disclosure are not limited by the specific composition of the power conversion unit.

[0030] Specifically, the power conversion unit can be used to realize the inversion process of DC to AC and / or the rectification process of AC to DC, and the power conversion unit can also realize the adjustment of electric power in the power supply process, such as adjusting the output power voltage value (in this case, it has the function of a DC / DC converter, for example).

[0031] The switch module 140 refers to a circuit formed by electrical control devices (such as relays, contactors), which is used to implement the switching and selection of different working modes of the power system. For example, the switch module can be a relay matrix or a contactor matrix, which can include multiple switch devices to achieve flexible and reliable access to different branches of the power system. However, it should be understood that the embodiments of the present disclosure are not limited by the specific composition of the switch module.

[0032] Wherein, based on the configuration of the switch module 140 , the power system 100 is selectively in one of a motor driving mode and an AC charging mode.

[0033] The motor driving mode refers to a mode for driving a motor in an electric power system according to the electric energy stored in the energy storage unit.

[0034] The AC charging mode refers to a mode in which an external AC power supply module is used to charge the energy storage unit of the power system.

[0035] Based on the configuration of the switch module 140, the power system 100 is selectively in one of the motor drive mode and the AC charging mode. For example, it can be described more specifically. For example, when the switch module includes multiple switch devices, the switch module can be connected or disconnected to connect different branches by controlling the conduction (i.e., closing) and disconnection states of the multiple switch devices, so that the power system is selectively in different working modes (for example, in the motor drive mode or the AC charging mode).

[0036] When the power system 100 is in the AC charging mode, the switch module 140 is configured to charge the energy storage unit 110 from the external power supply module 200 via the multiple power converters in the power conversion unit 130 .

[0037] Reference Figure 1 When the power system is in the AC charging mode, the external power supply module 200 is electrically connected to the power conversion unit 130 via the switch module 140, for example, via the circuit indicated by the dashed line on the left, and the power conversion unit 130 is further electrically connected to the energy storage unit 110 via the switch module 140 on the right and the circuit indicated by the solid line, so that the power conversion unit 130 is electrically connected to the energy storage unit 110 through the multiple power converters (in Figure 1Three power converters are schematically shown in the figure) to charge the energy storage unit 110.

[0038] It should be understood that the power conversion unit 130 may include, for example, two power converters, or may also include three power converters, and the embodiments of the present disclosure are not limited by the specific number of power converters included in the power conversion unit 130.

[0039] It should be understood that the multiple power converters may be, for example, power converters of the same type, for example, they are all three-phase inverters; or the multiple power converters may be, for example, power converters of different types, for example, when the power conversion unit 130 may include, for example, three power converters, one of which may be, for example, a single-phase inverter, and the other two power converters may be, for example, three-phase inverters. The embodiments of the present disclosure are not limited by the specific type and composition of the inverter.

[0040] And wherein, when the power system 100 is in the motor driving mode, the switch module 140 is configured to supply power from the energy storage unit 110 to the motor 120 via the plurality of power converters.

[0041] Reference Figure 1 , when the power system is in motor drive mode, Figure 1 The circuit portion shown by the dotted line is not connected to the circuit at this time, so that the external power supply module 200 and the corresponding switch module 140 are not connected to the power system. At this time, the energy storage unit 110 is electrically connected to the power conversion unit 130, for example, via the corresponding switch module 140, and the power conversion unit 130 is further electrically connected to the motor 120, for example, via the corresponding switch module 140, thereby realizing the driving process of the motor 120 through multiple power converters in the power conversion unit 130.

[0042] Next, the above-mentioned power system 100 will be described in more detail in conjunction with a specific circuit. Figure 2 2 is a circuit diagram of an example of a power system 100 according to an embodiment of the present disclosure.

[0043] Reference Figure 2 , which shows the energy storage unit 110, the motor 120, the power conversion unit 130 and part of the switch module 140 included in the power system 100. And the external power supply module 200 is, for example, an AC power supply module.

[0044] The energy storage unit 110 includes, for example, a power battery 111 , switches K6 and K4 connected in series with the power battery, and a protection resistor R1 and a switch K5 connected in parallel with the switch K4 , for realizing power supply protection.

[0045] The motor 120 is, for example, a three-phase AC motor M, and Figure 2 The three-phase windings U, V, and W are indicated in the middle.

[0046] The power conversion unit 130 includes, for example, three power converters (eg Figure 2 As shown in the figure, the three power converters are, for example, all three-phase inverters), and are described below as a first power converter 131, a second power converter 132, and a third power converter 133.

[0047] Specifically, the first power converter 131 includes, for example, a three-phase bridge arm and is provided with six control switches. The control switch may include, for example, a switch control device (such as a transistor or an IGBT tube) and a diode connected in reverse parallel thereto, and the upper and lower control switches constitute a phase bridge arm, forming a three-phase bridge arm. Specifically, the control switch Q1 and the control switch Q4 form a first phase bridge arm, the control switch Q2 and the control switch Q5 form a second phase bridge arm, and the control switch Q3 and the control switch Q6 form a third phase bridge arm.

[0048] The second power converter 132 includes, for example, a three-phase bridge arm and is provided with six control switches. The control switch may include, for example, a switch control device (such as a transistor or an IGBT tube) and a diode connected in reverse parallel thereto, and the upper and lower control switches constitute a phase bridge arm, forming a three-phase bridge arm. Specifically, the control switch Q9 and the control switch Q12 form a first phase bridge arm, the control switch Q10 and the control switch Q13 form a second phase bridge arm, and the control switch Q11 and the control switch Q14 form a third phase bridge arm.

[0049] The third power converter 133 includes, for example, a three-phase bridge arm and is provided with six control switches. The control switch may include, for example, a switch control device (such as a transistor or an IGBT tube) and a diode connected in reverse parallel thereto, and the upper and lower control switches constitute a phase bridge arm, forming a three-phase bridge arm. Specifically, the control switch Q15 and the control switch Q18 form a first phase bridge arm, the control switch Q16 and the control switch Q19 form a second phase bridge arm, and the control switch Q17 and the control switch Q20 form a third phase bridge arm.

[0050] And among them, refer to Figure 2, the specific connection mode of the three power converters is, for example, that the first end 131-1 of the first power converter 131 is, for example, electrically connected to the first end 132-1 of the second power converter 132, and the second end 131-2 of the first power converter 131 is, for example, electrically connected to the second end 132-2 of the second power converter 132. And wherein, the first end 132-1 of the second power converter 132 is, for example, selectively electrically connected to the first end 133-1 of the third power converter 133 via the switch K1 in the switch module 140, and the second end 132-2 of the second power converter 132 is, for example, selectively electrically connected to the second end 133-2 of the third power converter 133 via the switch K2 in the switch module 140.

[0051] The switch module 140, for example, includes a plurality of electrical control devices S1, S2, S3, S4, S5, S6, S7, S8, S9, K1, and K2, and the electrical control devices are, for example, single-pole multi-throw switch devices (the switch devices are, for example, formed by relays).

[0052] The external power supply module 200 is, for example, a three-phase AC power supply module, and the three-phase output terminals of the three-phase AC power supply module are, for example, electrically connected to corresponding inductance elements L1, L2, and L3.

[0053] Continue to refer to Figure 2 The power system is also provided with a transformer 150, which can work together with multiple power converters in the power conversion unit 130 in the AC charging mode to realize the function of charging the energy storage unit. The specific working method will be described in more detail below and will not be repeated here.

[0054] The different working modes of the power system and the circuit structures under different working modes will be explained in conjunction with the specific working modes below and will not be described in detail here.

[0055] Based on the above, in the present application, by setting the power system to include an energy storage unit, a motor, a power conversion unit and a switch module, and further setting the power system to be selectively in one of the motor drive mode and the AC charging mode based on the configuration of the switch module, it is possible to achieve different functions of the power system based on the simple and flexible configuration of the switch module. In addition, by setting that when the power system is in the AC charging mode, the energy storage unit is charged from the external power supply module via the multiple power converters in the power conversion unit, and when the power system is in the motor drive mode, the motor is powered from the energy storage unit via the multiple power converters, so that the power converter in the power conversion unit can be flexibly reused in different working modes according to actual needs to achieve different functions. Compared with the current situation in which the modules of the power system are simply physically stacked together, and the electrical components in each module are still isolated from each other and cannot be reused, in the present application, by setting a power conversion unit, each module of the power system can call the electrical components in the power conversion unit according to actual needs, so that on the premise of achieving good power supply, the cross-module integration and reuse of electrical components in the power system can be further realized, so that according to the actual use requirements and working modes of the electrical system, multiple electrical components in the power system can be flexibly called and reused to realize corresponding functions, thereby achieving high system integration, streamlining circuit structure, and reducing manufacturing costs.

[0056] In some embodiments, each of the power converters includes a control switch for controlling the operation of the power converter, and the control switches in each power converter can be controlled independently of each other.

[0057] It should be understood that the power converter may include, for example, 2 control switches, or 6 control switches. The embodiments of the present disclosure are not limited by the number of the control switches.

[0058] The control switch can be configured to be in an on or off state, for example, to disconnect or connect different branches, thereby realizing control over the operation of the power converter. However, it should be understood that the embodiments of the present disclosure are not limited by the specific control method of the control switch over the operation of the power converter.

[0059] The control switches in the power converter can be controlled independently of each other, which means that the control switches in the power converter can be controlled independently of each other to be in an on or off state, and the on and off states of the various control switches will not interfere with each other.

[0060] For example, refer to Figure 2For example, taking the first power converter 131 as an example, each of the six control switches Q1, Q2, Q3, Q4, Q5, and Q6 included therein can be independently configured to be in an on or off state to connect or disconnect different bridge arms, thereby enabling different functions of the power converter.

[0061] Based on the above, compared to the current situation in which the control ends of two or more control switches in a power converter are connected to the same control signal, so that the two or more control switches can only be configured to be in the same on-off state because they are all controlled by the same control signal, in the present application, by setting each of the power converters to include a control switch for controlling the operation of the power converter, and the control switches in each power converter can be controlled independently relative to each other, the on-off state of each control switch can be independently controlled in a reliable manner, so that the state control of the control switch can be flexibly realized according to actual needs and actual usage scenarios, effectively improving the flexibility of use of the power converter and expanding its usage scenarios.

[0062] In some embodiments, reference Figure 2 The power conversion unit 130 includes three power converters, namely a first power converter 131 , a second power converter 132 , and a third power converter 133 .

[0063] It should be understood that the first power converter 131, the second power converter 132, and the third power converter 133 may be, for example, power converters of the same type and composition (for example, Figure 2 However, the first power converter 131, the second power converter 132, and the third power converter 133 may also be different types of power converters. The embodiments of the present disclosure are not limited by the types and compositions of the three power converters.

[0064] It should be understood that Figure 2 Only an exemplary connection method of three power converters is given in the figure. The embodiments of the present disclosure are not limited by the specific connection method of the three power converters in the power conversion unit.

[0065] Based on the above, in the present application, by setting the power conversion unit to include three power converters, namely a first power converter, a second power converter, and a third power converter, the connection mode and the working mode of the three power converters can be flexibly set according to actual needs, thereby realizing a variety of different working modes and meeting different application scenarios.

[0066] In some embodiments, the motor 120 is, for example, a three-phase AC motor, and in the motor drive mode, the switch module 140 is configured to electrically connect the three power converters of the power conversion unit 130 to the energy storage unit 110 respectively, so as to receive direct current from the energy storage unit 110 and output alternating current for corresponding phases of the motor 120 respectively.

[0067] For example, the three power converters respectively output three-phase AC power for driving a three-phase AC motor based on the power obtained from the energy storage unit 110 .

[0068] Based on the above, in the present application, the switch module is configured to electrically connect the three power converters of the power conversion unit to the energy storage unit respectively, so as to receive direct current from the energy storage unit and output alternating current for the corresponding phases of the motor respectively, so that reliable and good driving of the motor can be achieved by using the power converter in the power conversion unit.

[0069] In some embodiments, the motor drive mode can be described in more detail, for example, wherein the switch module 140 is configured to electrically connect the first end and the second end of each of the three power converters to the first end and the second end of the energy storage unit 110, respectively, and the switch module 140 electrically connects the midpoint of at least one bridge arm of each of the three power converters to the corresponding phase of the motor 120, respectively.

[0070] For example, the three power converters may all be three-phase inverters, that is, each power converter has three bridge arms. For example, for each power converter, the midpoints of the three bridge arms of the power converter may be electrically connected to the corresponding phases of the motor.

[0071] Alternatively, the three power converters may be single-phase inverters, that is, each power converter has a bridge arm. For each power converter, the midpoint of the bridge arm of the power converter may be electrically connected to the corresponding phase of the motor.

[0072] It should be understood that the above only provides an example of connection between the bridge arm of the power converter and the corresponding phase of the motor, and the embodiments of the present disclosure are not limited thereto.

[0073] Figure 3 It is shown in Figure 2 The circuit diagram of the example power system 100 in the motor drive mode is shown in FIG. Figure 3 This motor driving mode is described in more detail.

[0074] Reference Figure 3, wherein, in the motor drive mode, the switch module 140 is configured as follows: switches K1 and K2 are closed, single-pole multi-throw switches S1, S2, and S3 are in a first configuration, single-pole multi-throw switches S4, S5, and S6 are in a second configuration, and single-pole multi-throw switches S7, S8, and S9 are in a first configuration.

[0075] Specifically, switches K1 and K2 are closed so that the first end 131-1 of the first power converter 131, the first end 132-1 of the second power converter 132, and the first end 133-1 of the third power converter 133 are all electrically connected to the first end 110-1 of the energy storage unit 110; and the second end 131-2 of the first power converter 131, the second end 132-2 of the second power converter 132, and the second end 133-2 of the third power converter 133 are all electrically connected to the second end 110-2 of the energy storage unit 110.

[0076] The single-pole multi-throw switches S1, S2, and S3 are in a first configuration so that the midpoints 131a, 131b, and 131c of the three-phase bridge arms of the first power converter 131 are all electrically connected to the U-phase winding of the motor 120 (here, the three-phase AC motor M). The single-pole multi-throw switches S4, S5, and S6 are in a second configuration so that the midpoints 132a, 132b, and 132c of the three-phase bridge arms of the second power converter 132 are all electrically connected to the V-phase winding of the motor 120. The single-pole multi-throw switches S7, S8, and S9 are in a first configuration so that the midpoints 133a, 133b, and 133c of the three-phase bridge arms of the third power converter 133 are all electrically connected to the W-phase winding of the motor 120. Thus, the midpoints of the bridge arms of each of the three power converters are electrically connected to the corresponding phases of the motor 120.

[0077] Reference Figure 3 , and wherein the switches K4 and K6 in the energy storage unit 110 are closed, and the switch K5 is opened, so as to be well electrically connected to the power conversion unit and realize the driving of the motor.

[0078] At this time, the direct current from the power battery 111 in the energy storage unit 110 is converted into single-phase alternating current, for example, via one of the bridge arms of the first power converter 131, and the single-phase alternating current is output to the U phase of the motor 120 via the bridge arm midpoint 131b and the switch module; the direct current from the power battery 111 in the energy storage unit 110 is converted into single-phase alternating current, for example, via one of the bridge arms of the second power converter 132, and the single-phase alternating current is output to the V phase of the motor 120 via the bridge arm midpoint 132b and the switch module; the direct current from the power battery 111 in the energy storage unit 110 is converted into single-phase alternating current, for example, via one of the bridge arms of the third power converter 133, and the single-phase alternating current is output to the W phase of the motor 120 via the bridge arm midpoint 133b and the switch module, thereby realizing the driving of the motor. Figure 3 The arrows in FIG. 1 show the direction of current flow in the motor driving mode.

[0079] However, it should be understood that Figure 3 Only one driving circuit example is shown in the figure. According to actual needs, other bridge arms of the first, second and third power converters can be flexibly selected to realize the conversion process from direct current to single-phase alternating current.

[0080] Based on the above, in the present application, by setting in the motor driving mode, the switch module electrically connects the first end and the second end of each of the three power converters to the first end and the second end of the energy storage unit, and the switch module electrically connects the midpoint of at least one bridge arm of each of the three power converters to the corresponding phases of the drive motor, so that based on the configuration of the switch module, the multiple power converters in the power conversion unit can be utilized to achieve good driving of the motor in a simple and convenient manner.

[0081] In some embodiments, in the AC charging mode, the switch module 140 is configured to connect the power conversion unit 130 to the transformer 150 to form an AC charging circuit, so that the external power supply module 200 charges the energy storage unit 110 through the AC charging circuit.

[0082] The transformer refers to a device that uses the principle of electromagnetic induction to change the AC voltage, which includes, for example, a primary coil, a secondary coil, and a corresponding iron core. It should be understood that the embodiments of the present disclosure are not limited by the specific type and composition of the transformer.

[0083] The AC charging circuit refers to a circuit for charging the energy storage unit 110 based on AC power. For example, in the AC charging mode, the external power supply module may be, for example, a three-phase AC power. At this time, for example, the three-phase AC power may be rectified into DC power via the first part of the multiple power converters in the power conversion unit; the DC power may be inverted into an intermediate AC power (the voltage value of the intermediate AC power is different from the voltage value of the three-phase AC power of the external power supply module) via the second part of the multiple power converters; thereafter, the voltage value of the three-phase AC power is further adjusted via a transformer, and the adjusted AC power is output to the third part of the multiple power converters to achieve rectification of the AC power, thereby charging the energy storage unit 110.

[0084] Based on the above, in the present application, in the AC charging mode, the switch module is set to connect the power conversion unit to the transformer to form an AC charging circuit, so that the external power supply module charges the energy storage unit through the AC charging circuit, so that in the AC charging mode, the power converter in the power conversion unit can be reused to form an AC charging circuit. Compared with the additional AC charging circuit, the present application can further realize the integration and reuse of electrical components in the power system across modules, so that according to the actual use requirements and working modes of the electrical system, multiple power converters in the power conversion unit in the power system can be flexibly called and reused to realize corresponding functions, thereby realizing high system integration, streamlining circuit structure, and reducing manufacturing costs.

[0085] In some embodiments, the switch module 140 is configured to electrically connect the midpoint of at least one bridge arm of the first power converter 131 to the output end of the external power supply module 200 via at least one corresponding inductor, and to electrically connect the midpoint of at least one bridge arm of the second power converter 132 to the corresponding input end of the transformer 150 of the power system 100, and to electrically connect the output end of the transformer 150 to the midpoint of at least one bridge arm of the third power converter 133.

[0086] And wherein, the switch module 140 is configured to connect the first end 131-1 of the first power converter 131 with the first end 132-1 of the second power converter 132; connect the second end 131-2 of the first power converter 131 with the second end 132-2 of the second power converter 132; and connect the first end 133-1 of the third power converter 133 to the first end 110-1 of the energy storage unit 110, and connect the second end 133-2 of the third power converter 133 to the second end 110-2 of the energy storage unit 110.

[0087] It should be understood that based on the above connection, a good charging process can be achieved through the external AC power supply module in the AC charging mode. Specifically, the external power supply module can be, for example, a single-phase AC power supply module. At this time, the first power converter, for example, only uses the midpoint of one bridge arm to be electrically connected to the output end of the single-phase AC power supply module to achieve rectification of the single-phase AC power, and outputs the rectified DC power to the second power converter. The second power converter inverts the rectified DC power to obtain intermediate AC power with different voltage values, and transmits the intermediate AC power to the input end of the transformer via the midpoint of one bridge arm of the second power converter. At this time, the voltage-adjusted single-phase AC power is obtained at the output end of the transformer, and the adjusted single-phase AC power is transmitted to the midpoint of one bridge arm of the third power converter 133 to achieve rectification of the adjusted single-phase AC power, and finally to the energy storage unit.

[0088] For example, the external power supply module may also be a three-phase alternating current. Figure 4 It is shown in Figure 2 The circuit diagram of the example power system 100 in the AC charging mode is shown in FIG. Figure 4 The AC charging mode is described in more detail.

[0089] Reference Figure 4 , wherein, in the AC charging mode, the switch module 140 is configured as follows: switches K1 and K2 are disconnected, the single-pole multi-throw switches S1, S2, and S3 are in the second configuration, the single-pole multi-throw switches S4, S5, and S6 are in the first configuration, and the single-pole multi-throw switches S7, S8, and S9 are in the second configuration.

[0090] Specifically, switches K1 and K2 are disconnected so that the first end 131-1 of the first power converter 131 is connected to the first end 132-1 of the second power converter 132, and the second end 131-2 of the first power converter 131 is connected to the second end 132-2 of the second power converter 132; and the first end 133-1 of the third power converter 133 is electrically connected to the first end 110-1 of the energy storage unit 110, and the second end 133-2 of the third power converter 133 is electrically connected to the second end 110-2 of the energy storage unit 110.

[0091] The single-pole multi-throw switches S1, S2, and S3 are in the second configuration so that the midpoint 131a of the first bridge arm of the first power converter 131 is electrically connected to the first output end (i.e., the first phase) of the external AC power supply module 200 (here, a three-phase AC power supply module) via the first inductor L1, the midpoint 131b of the second bridge arm of the first power converter 131 is electrically connected to the second output end (i.e., the second phase) of the external AC power supply module 200 (here, a three-phase AC power supply module) via the second inductor L2, and the midpoint 131c of the third bridge arm of the first power converter 131 is electrically connected to the third output end (i.e., the third phase) of the external AC power supply module 200 (here, a three-phase AC power supply module) via the third inductor L3.

[0092] The single-pole multi-throw switches S4, S5, and S6 are in a first configuration so that the midpoint 132a of the first bridge arm of the second power converter 132 is electrically connected to the first input terminal of the transformer 150, the midpoint 132b of the second bridge arm of the second power converter 132 is electrically connected to the second input terminal of the transformer 150, and the midpoint 132c of the third bridge arm of the second power converter 132 is electrically connected to the third input terminal of the transformer 150.

[0093] The single-pole multi-throw switches S7, S8, and S9 are in a second configuration so that the midpoint 133a of the first bridge arm of the third power converter 133 is electrically connected to the first output terminal of the transformer 150, the midpoint 133b of the second bridge arm of the third power converter 133 is electrically connected to the second output terminal of the transformer 150, and the midpoint 133c of the third bridge arm of the third power converter 133 is electrically connected to the third output terminal of the transformer 150.

[0094] Reference Figure 3 , and wherein the switches K4 and K6 in the energy storage unit 110 are closed, and the switch K5 is opened, so as to be well electrically connected to the power conversion unit and realize the driving of the motor.

[0095] At this time, the three-phase AC power from the external power supply module 200 (here, for example, a three-phase AC power supply module) is first input to the midpoints 131a, 131b, and 131c of the three-phase bridge arms of the first power converter 131, and then rectified by the three-phase bridge arms of the first power converter 131. The rectified DC power is output at the first end 131-1 and the second end 131-2 of the first power converter 131, and the DC power is input to the second power converter 132, and is inverted by the second power converter 132 to generate intermediate AC power. The intermediate AC power has a different AC voltage value from the AC power in the external power supply module, and the intermediate AC power is output to the second power converter 132 through the inverter processing. The midpoints 132a, 132b, 132c of the three-phase bridge arms of the converter 132 are output to the corresponding input ends of the transformer 150, and then the corresponding adjusted three-phase alternating current (hereinafter referred to as three-phase adjusted alternating current) is output at the output end of the transformer 150 through the processing of the primary coil and the secondary coil inside the transformer. The three-phase adjusted alternating current is, for example, input to the third power converter 133 through the midpoints 133a, 133b, 133c of the three-phase bridge arms of the third power converter 133, and is rectified by the third power converter, and finally the direct current for charging the energy storage unit 110 is output at the first end 133-1 and the second end 133-2 of the third power converter 133. Figure 4 The arrows in the figure show the direction of current flow in the AC charging mode.

[0096] It should be understood that in Figure 4 In the example shown, the second power converter 132, the transformer 150 and the third power converter 133 work together to realize the function of the DC / DC converter. Specifically, as the charging process proceeds, the voltage of the power battery in the energy storage unit will continue to increase. In order to achieve reliable and stable charging, the voltage of the DC power supplied to the energy storage unit needs to be adjusted accordingly. Therefore, the second power converter 132, the transformer 150 and the third power converter 133 work together to form a DC / DC converter 140 to boost the DC power output by the inverter.

[0097] However, it should be understood that Figure 4 Only one example of a driving circuit is shown in the figure. According to actual needs, other combinations of one or more bridge arms in the first, second, and third power converters can be flexibly selected to implement the AC charging process. The embodiments of the present disclosure are not limited by the number of bridge arms of the power converters involved in forming the charging circuit and their combinations.

[0098] Based on the above, in the present application, by setting in the AC charging mode, the midpoint of at least one bridge arm of the first power converter is electrically connected to the output end of the external power supply module via at least one corresponding inductor; the midpoint of at least one bridge arm of the second power converter is electrically connected to the corresponding input end of the transformer of the power system, and the output end of the transformer is electrically connected to the midpoint of the bridge arm of the third power converter, and the first, second, and third power converters are set to have the above connection method, so that in the AC charging mode, by reusing multiple power converters in the power conversion unit, the charging process of the energy storage unit can be realized in a simple and convenient manner, thereby improving the integration of the circuit and simplifying the circuit structure.

[0099] In some embodiments, reference Figure 2 , the power converter is, for example, a three-phase power converter.

[0100] The three-phase power converter refers to a power converter having three bridge arms and capable of selectively accessing corresponding phases of three-phase alternating current as required, such as a three-phase inverter.

[0101] Figure 2 For example, three three-phase power converters 131, 132, and 133 are shown. Next, the internal structure of the three-phase power converter 131 will be described in more detail by taking the three-phase power converter 131 as an example.

[0102] For example, as mentioned above, the three-phase power converter 131 includes six control switches Q1-Q6, and the six control switches will be divided more specifically below. Specifically, the three-phase power converter 131 includes: a first upper arm control switch Q1, a first lower arm control switch Q4, a second upper arm control switch Q2, a second lower arm control switch Q5, a third upper arm control switch Q3 and a third lower arm control switch Q6.

[0103] The first end of the first upper arm control switch Q1 is, for example, electrically connected to the first end 131 - 1 of the three-phase power converter 131 , and the control end of the first upper arm control switch Q1 is electrically connected to the first upper arm control end to receive a corresponding control signal, such as a first control signal.

[0104] The first end of the first lower arm control switch Q4 is, for example, electrically connected to the second end of the first upper arm control switch Q2, and the second end of the first lower arm control switch Q4 is electrically connected to the second end 131-2 of the three-phase power converter 131, and the control end of the first lower arm control switch Q4 is electrically connected to the first lower arm control end to receive a corresponding control signal, such as a second control signal.

[0105] The first end of the second upper arm control switch Q2 is, for example, electrically connected to the first end 131 - 1 of the three-phase power converter 131 , and the control end of the second upper arm control switch Q2 is electrically connected to the second upper arm control end to receive a corresponding control signal, such as a third control signal.

[0106] The first end of the second lower arm control switch Q5 is, for example, electrically connected to the second end of the second upper arm control switch Q2, and the second end of the second lower arm control switch Q5 is electrically connected to the second end 131-2 of the three-phase power converter 131, and the control end of the second lower arm control switch Q5 is electrically connected to the second lower arm control end to receive a corresponding control signal, such as a fourth control signal.

[0107] The first end of the third upper arm control switch Q3 is, for example, electrically connected to the first end 131 - 1 of the three-phase power converter 131 , and the control end of the third upper arm control switch Q3 is electrically connected to the third upper arm control end to receive a corresponding control signal, such as the fifth control signal.

[0108] The first end of the third lower arm control switch Q6 is, for example, electrically connected to the second end of the third upper arm control switch Q3, and the second end of the third lower arm control switch Q6 is electrically connected to the second end 131-2 of the three-phase power converter 131, and the control end of the third lower arm control switch Q6 is electrically connected to the third lower arm control end to receive a corresponding control signal, such as the sixth control signal.

[0109] It should be understood that the control signal can be, for example, an electrical signal, and the first, second, third, fourth, fifth, and sixth signals can be, for example, the same or different electrical signals according to actual needs, so that each control switch can, for example, receive the corresponding control signal independently of each other and be controlled independently of each other.

[0110] It should be understood that the above only uses the first power converter 131 as an example to illustrate the internal structure and connection relationship of the three-phase power converter. Other three-phase power converters (such as the second power converter 132 and the third power converter 133) also have the same structural layout as this structure, which will not be repeated here.

[0111] Based on the above, in the present application, by setting the power converter as a three-phase power converter, and setting each three-phase power converter to include a first upper arm control switch, a first lower arm control switch, a second upper arm control switch, a second lower arm control switch, a third upper arm control switch, and a third lower arm control switch, and further setting the connection method of each control switch, the three-phase power converter in the present application can realize independent control of each internal control switch relative to each other in a simple and convenient manner, so that the corresponding control switches can be set to different on-off states according to actual needs, thereby realizing different functional modes.

[0112] In some embodiments, the control switch is an insulated gate bipolar transistor or a silicon carbide transistor.

[0113] For example, refer to Figure 2 The control switch may also include, for example, a diode connected in reverse parallel to the insulated gate bipolar transistor or the silicon carbide transistor.

[0114] Based on the above, by setting the control switch to an insulated gate bipolar transistor or a silicon carbide transistor, reliable and flexible control of the control switch can be achieved.

[0115] According to another aspect of the present invention, a power conversion device is provided. The power conversion device includes the power system as described above.

[0116] The power conversion device may, for example, have the structure of the power system described above and implement the various functions of the power system described above, which will not be described in detail here.

[0117] It should be understood that, according to actual needs, the power conversion device may also be provided with other circuits or electrical components, and the embodiments of the present disclosure are not limited by the specific composition of the power conversion device.

[0118] According to another aspect of the present disclosure, a vehicle is provided, the vehicle comprising the power conversion device as described above and capable of realizing the functions as described above.

[0119] The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a range extended EV, or a fuel cell electric vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle.

[0120] The present application uses specific words to describe the embodiments of the present application. For example, "first / second embodiment", "one embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0121] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0122] The above is an explanation of the present invention and should not be considered as a limitation thereof. Although several exemplary embodiments of the present invention have been described, it will be readily appreciated by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention as defined in the claims. It should be understood that the above is an explanation of the present invention and should not be considered as being limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present invention is defined by the claims and their equivalents.

Claims

1. A power system, configured to receive power from an external power supply module, comprising: Energy storage unit, motor, power conversion unit and switch module; Wherein, based on the configuration of the switch module, the power system is selectively in one of a motor drive mode and an AC charging mode, When the power system is in an AC charging mode, the switch module is configured to charge the energy storage unit from an external power supply module via a plurality of power converters in the power conversion unit, and When the electric power system is in a motor driving mode, the switch module is configured to supply power from the energy storage unit to the motor via the plurality of power converters.

2. The power system according to claim 1, wherein: Each of the power converters includes a control switch for controlling the operation of the power converter, and the control switches in each power converter can be controlled independently of each other.

3. The power system according to claim 1, wherein: The power conversion unit includes three power converters, namely a first power converter, a second power converter, and a third power converter.

4. The power system according to claim 3, wherein: In the motor driving mode, the switch module is configured to electrically connect the three power converters of the power conversion unit to the energy storage unit respectively to receive direct current from the energy storage unit and output alternating current for corresponding phases of the motor respectively.

5. An electric power system according to claim 4, wherein the switch module electrically connects the first end and the second end of each of the three power converters to the first end and the second end of the energy storage unit, respectively, and the switch module electrically connects the midpoint of at least one bridge arm of each of the three power converters to the corresponding phase of the motor, respectively.

6. The power system according to claim 3, wherein: In the AC charging mode, the switch module is configured to connect the power conversion unit to a transformer to form an AC charging circuit, so that the external power supply module charges the energy storage unit through the AC charging circuit.

7. The power system according to claim 6, wherein the switch module is configured as: Electrically connecting a midpoint of at least one bridge arm of the first power converter to an output end of an external power supply module via at least one corresponding inductor; Electrically connecting the midpoint of at least one bridge arm of the second power converter to the corresponding input end of the transformer of the power system, and electrically connecting the output end of the transformer to the midpoint of at least one bridge arm of the third power converter; And among them, The switching module is configured to connect the first end of the first power converter to the first end of the second power converter; connect the second end of the first power converter to the second end of the second power converter; and connect the first end of the third power converter to the first end of the energy storage unit, and connect the second end of the third power converter to the second end of the energy storage unit.

8. The power system according to claim 1, wherein: The power converter is a three-phase power converter, and each three-phase power converter comprises: A first upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end of which is electrically connected to the first upper arm control end; A first lower arm control switch, a first end of which is electrically connected to the second end of the first upper arm control switch, a second end of which is electrically connected to the second end of the three-phase power converter, and a control end of which is electrically connected to the first lower arm control end; A second upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end of which is electrically connected to a second upper arm control end; A second lower arm control switch, a first end of which is electrically connected to the second end of the second upper arm control switch, a second end of which is electrically connected to the second end of the three-phase power converter, and a control end of which is electrically connected to the second lower arm control end; A third upper arm control switch, a first end of which is electrically connected to the first end of the three-phase power converter, and a control end of which is electrically connected to a third upper arm control end; The third lower arm control switch has a first end electrically connected to the second end of the third upper arm control switch, a second end electrically connected to the second end of the three-phase power converter, and a control end electrically connected to the third lower arm control end.

9. The power system according to claim 8, wherein: The control switch is an insulated gate bipolar transistor or a silicon carbide transistor.

10. A power conversion device, comprising the power system according to any one of claims 1-9.

11. A vehicle comprising the power conversion device according to claim 10.

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