Electric power system and vehicle

Abstract

Disclosed are a power system and a vehicle, the power system configured to receive power from an external power supply module, the power system including: an energy storage unit; the motor driving circuit comprises a motor and an inverter electrically connected with the motor; the motor driving circuit is electrically connected to the energy storage unit through the switch module, and the motor driving circuit is operably and electrically connected to the external power supply module through the switch module; wherein, based on the configuration of the switch module, the power system is selectively in one of a motor driving mode, a direct current boost charging mode and an alternating current charging mode; and wherein, in the DC boost charging mode and the AC charging mode, the motor drive circuit is used as a part of a charging circuit.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and more specifically to an electric power system 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, power systems usually include motor drive circuits and energy storage units, and current power systems can, for example, selectively be in motor drive mode and DC charging mode. In the motor drive mode, it supplies power to the motor via the energy storage unit to realize the motor drive process; in the DC charging mode, it charges the energy storage unit, for example, via an external DC power supply module.

[0003] However, on the one hand, the current power system has a relatively simple function and can only be in one or two working modes, which cannot meet different actual use needs and charging needs. For example, it cannot realize the function of using AC power to charge the energy storage unit. On the other hand, the current power system has a low degree of reuse of motor drive circuits. In the DC charging mode, when the voltage of the external power supply module is lower than the voltage of the energy storage unit, it is usually necessary to set up an additional DC boost charging circuit to realize the charging process, which significantly increases the structural complexity and volume of the circuit.

[0004] Therefore, there is a need for an electric power system that can selectively be in multiple working modes while achieving good power supply, and can meet various usage requirements such as motor drive, DC charging, AC charging, etc., and the electric power system has a high degree of integration, a simple circuit structure, and high flexibility and reliability. Summary of the invention

[0005] In view of the above problems, the present invention provides a power system and a vehicle. The power system provided by the present invention can be selectively in multiple working modes under the premise of achieving good power supply, meeting multiple usage requirements such as motor drive, DC charging, AC charging, etc., and the power system has high integration, simple circuit structure, high flexibility and reliability.

[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 the power system includes: an energy storage unit; a motor drive circuit, the motor drive circuit includes a motor and an inverter electrically connected to the motor; a switch module, the motor drive circuit is electrically connected to the energy storage unit via the switch module, and the motor drive circuit is operably electrically connected to the external power supply module via the switch module; wherein, based on the configuration of the switch module, the power system is selectively in one of a motor drive mode, a DC boost charging mode and an AC charging mode; and wherein, in the DC boost charging mode and the AC charging mode, the motor drive circuit is used as a part of a charging circuit.

[0007] In some embodiments, in the motor driving mode, the switch module electrically connects the first end and the second end of the inverter circuit of the inverter to the first end and the second end of the energy storage unit, respectively, and the switch module is configured to enable the inverter to receive direct current from the energy storage unit and output alternating current for driving the motor.

[0008] In some embodiments, in the DC boost charging mode, the external power supply module is a DC power supply module, and the maximum output voltage of the DC power supply module is less than the voltage of the energy storage unit; wherein the switch module is configured to enable the motor and inverter to be used as a boost charging circuit.

[0009] In some embodiments, in the DC boost charging mode, the switch module is configured to use the winding of the motor as an inductor to charge the energy storage unit; wherein the switch module is configured to electrically connect one end of at least one phase winding of the motor to the DC power supply module, and electrically connect a first end of the inverter circuit of the inverter to a first end of the energy storage unit, and electrically connect a second end of the inverter circuit to the DC power supply module and a second end of the energy storage unit.

[0010] In some embodiments, in the AC charging mode, the external power supply module is an AC power supply module; wherein the switch module is configured to enable the motor and the inverter to function as an AC charging circuit.

[0011] In some embodiments, the AC charging mode includes a single-phase AC charging mode and a three-phase AC charging mode.

[0012] In some embodiments, in the single-phase AC charging mode, the external power supply module is a single-phase AC power supply module, and wherein the switch module is configured to electrically connect one end of at least one phase of the winding of the motor to the single-phase AC power supply module, and to electrically connect a first end of the inverter circuit of the inverter to a first end of an energy storage unit, and to electrically connect a second end of the inverter circuit to a second end of the energy storage unit.

[0013] In some embodiments, in the three-phase AC charging mode, the external power supply module is a three-phase AC power supply module, and wherein the switch module is configured to electrically connect one end of the three-phase winding of the motor to the three-phase AC power supply module respectively, and to electrically connect the first end of the inverter circuit of the inverter to the first end of the energy storage unit, and to electrically connect the second end of the inverter circuit to the second end of the energy storage unit and the three-phase AC power supply module.

[0014] In some embodiments, the power system further includes a DC / DC converter disposed between the inverter and the energy storage unit.

[0015] In some embodiments, the power system is also configured to be in a DC bypass charging mode, in which the external power supply module is a DC power supply module whose maximum output voltage is greater than or equal to the voltage of the energy storage unit; and wherein the switch module is configured to electrically connect the DC power supply module to the energy storage unit via a bypass circuit, so that the motor drive circuit does not serve as the charging circuit.

[0016] In some embodiments, the switch module includes a switch device.

[0017] In some embodiments, the switching device comprises a relay.

[0018] According to another aspect of the present invention, a vehicle is provided, comprising the power system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 1 shows a schematic block diagram of a power system 100 according to an embodiment of the present disclosure;

[0021] Figure 2 : A circuit diagram of an example of a power system 100 according to an embodiment of the present disclosure is shown;

[0022] Figure 3 A schematic diagram of a power system 100 in a motor driving mode according to an embodiment of the present disclosure is shown;

[0023] Figure 4 It is shown in Figure 2 A circuit diagram of an example power system 100 in a motor drive mode;

[0024] Figure 5 A schematic diagram of a power system 100 in a DC boost charging mode according to an embodiment of the present disclosure is shown;

[0025] Fig. 6A It is shown in Figure 2 A circuit diagram of an example power system 100 in the first stage of a DC boost charging mode;

[0026] Figure 6B It is shown in Figure 2 A circuit diagram of an example power system 100 in the second stage of the DC boost charging mode;

[0027] Figure 7 A schematic diagram showing a power system 100 in an AC charging mode according to an embodiment of the present disclosure is shown;

[0028] Figure 8 It is shown in Figure 2 A circuit diagram of an example charging system 100 in a single-phase AC charging mode;

[0029] Fig. 9 It is shown in Figure 2 A circuit diagram of an example charging system 100 in a three-phase AC charging mode;

[0030] Fig.10 Shows Figure 2 1 is a circuit diagram of an example power system 100 in a DC bypass charging mode. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Reference Figure 1 The power system 100 , for example, includes: an energy storage unit 110 , a motor drive circuit 120 , and a switch module 130 .

[0035] 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 an electric energy storage unit in other forms.

[0036] The motor drive circuit 120 refers to a circuit structure for realizing motor drive. Specifically, the motor drive circuit 120 includes, for example, a motor 121 and an inverter 122 electrically connected to the motor 121 .

[0037] The inverter refers to an electrical structure for realizing the inversion of direct current to alternating current. Specifically, the inverter may be, for example, an integrated three-phase inverter, or may be a comprehensive circuit structure including a logic control circuit and an inverter circuit. The embodiments of the present disclosure are not limited by the specific composition of the inverter and its implementation method.

[0038] The switch module 130 refers to a circuit formed by a switch device (such as a relay switch device, or other switch submodule), which is used to implement the switching and selection of different working modes of the power system. For example, the switch module may 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.

[0039] The motor driving circuit 120 is electrically connected to the energy storage unit 110 via the switch module 130 , and the motor driving circuit 120 is operably electrically connected to the external power supply module 200 via the switch module 130 .

[0040] Wherein, based on the configuration of the switch module 130, the power system 100 is selectively in one of a motor driving mode, a DC boost charging mode and an AC charging mode.

[0041] The motor driving mode refers to a mode for driving the motor in the motor driving circuit according to the electric energy stored in the energy storage unit.

[0042] The DC boost charging mode refers to a mode in which the energy storage unit of the power system is charged via a DC boost process when the maximum output voltage of the external DC power supply module is lower than the voltage of the energy storage unit.

[0043] 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.

[0044] Based on the configuration of the switch module 130, the power system 100 is selectively in one of the motor drive mode, the DC boost charging 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 from different branches by controlling the conduction and closing states of the multiple switch devices, so that the power system is selectively in different working modes (for example, in the motor drive mode, the DC boost charging mode or the AC charging mode).

[0045] And wherein, in the DC boost charging mode and the AC charging mode, the motor driving circuit 120 is used as a part of the charging circuit.

[0046] The charging circuit refers to a circuit used to charge an energy storage unit in a power system using an external power supply module.

[0047] For example, in the DC boost charging mode, the configuration of the switch module 130 can be set so that the motor 121 and the inverter 122 in the motor drive circuit 120 are used as a boost charging circuit to implement the DC boost charging process.

[0048] For example, in the AC charging mode, the configuration of the switch module 130 can be set so that the motor 121 and the inverter 122 in the motor drive circuit 120 are used as an AC charging circuit to realize a direct-to-alternating current charging process.

[0049] However, it should be understood that the above only provides an example of a motor driving circuit being used as a part of a charging circuit in the DC boost charging mode and the AC charging mode.

[0050] 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.

[0051] Reference Figure 2, which shows the energy storage unit 110, the motor drive circuit 120, and the switch module 130 included in the power system 100; and the external power supply module 200, for example, can selectively include a DC power supply module 201 and / or an AC power supply module 202 ( Figure 2 The reference numerals 120 and 200 are not shown in FIG.

[0052] 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.

[0053] The motor drive circuit 120 , for example, includes a motor 121 (here a three-phase AC motor including three-phase windings La, Lb, and Lc) and an inverter 122 .

[0054] The inverter 122 is, for example, a three-phase inverter, and the midpoints a, b, and c of the three-phase bridge arms of the three-phase inverter 112 are respectively connected to corresponding ends of the three-phase windings of the three-phase AC motor. The three-phase inverter includes, for example, six switch control units, wherein the switch control unit 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 switch control units constitute a phase bridge arm, forming a three-phase bridge arm in total.

[0055] Specifically, the switch control unit G1 and the switch control unit G2 form a first phase bridge arm, the switch control unit G3 and the switch control unit G4 form a second phase bridge arm, and the switch control unit G5 and the switch control unit G6 form a third phase bridge arm.

[0056] The switch module 130, for example, includes a plurality of electrical control devices, such as single-pole multi-throw switch devices (the switch devices are formed by relays, for example), and the motor drive circuit is electrically connected to the energy storage unit 110 via the switch module 130, and the motor drive circuit is operably electrically connected to the external power supply module via the switch module 130.

[0057] The different working modes of the power system and the circuit structures under different working modes will be explained below in conjunction with the specific working modes and will not be described in detail here.

[0058] Based on the above, in the present application, by setting the power system to include an energy storage unit, a motor drive circuit, and a switch module, and by configuring the switch module, the power system is selectively in one of the motor drive mode, the DC boost charging mode, and the AC charging mode, thereby expanding the working mode of the power system under the premise of achieving good power supply, so that the power system can be selectively in multiple working modes to meet various usage requirements such as motor drive, DC charging, and AC charging. In addition, by setting the motor drive circuit as a part of the charging circuit in the DC boost charging mode and the AC charging mode, the motor drive circuit in the power system can be well reused to realize a variety of different functions, especially in DC boost charging and AC charging, by reusing the motor drive circuit as a part of the charging circuit, it is avoided to set up an additional charging circuit with a complicated structure, thereby improving the integration of the power system, simplifying the circuit structure, and making the use flexibility and reliability of the power system higher.

[0059] Figure 3 A schematic diagram of the electric power system 100 in the motor driving mode according to an embodiment of the present disclosure is shown.

[0060] Reference Figure 3 In some embodiments, in the motor driving mode, the switch module 130 electrically connects the first end 122-1 and the second end 122-2 of the inverter circuit of the inverter 122 to the first end 110-1 and the second end 110-2 of the energy storage unit 110, respectively.

[0061] The switch module 130 is configured to enable the inverter 122 to receive direct current from the energy storage unit 110 and output alternating current for driving the motor 121 , thereby driving the motor.

[0062] It should be understood that Figure 3 1 shows a schematic diagram of a connection between the three-phase inverter and the three-phase input of the motor when the motor 121 is, for example, a three-phase motor and the inverter 122 is a three-phase inverter. However, the embodiments of the present disclosure are not limited by the motor type and the inverter type.

[0063] At this time, the external power supply module 200 and the corresponding switch module 130 are not electrically connected to the charging system ( Figure 3 Indicated by dotted lines).

[0064] Next, the motor driving mode will be described in more detail. Figure 4 It is shown in Figure 2 2 is a circuit diagram of an example power system 100 in a motor driving mode.

[0065] Reference Figure 4In the motor driving mode, the switches in the switch module are configured as follows: switches K1 and K2 are disconnected, single-pole multi-throw switches S1 and S2 are in the first configuration, and single-pole multi-throw switches S3 and S4 are in the first configuration.

[0066] Specifically, switches K1 and K2 are disconnected so that the external power supply module is not connected to the power system. SPMT switches S1 and S2 are in a first configuration (in which one end of the phase windings La and Lc is electrically connected to one end of the phase winding Lb) so that one end of the three-phase windings of the motor is connected. SPMT switches S3 and S4 are in a first configuration (in which the first end 122-1 of the inverter circuit of the inverter 122 is electrically connected to the first end 110-1 of the energy storage unit 110, and the second end 122-2 of the inverter circuit is electrically connected to the second end 110-2 of the energy storage unit 110).

[0067] At this time, the direct current from the power battery 111 in the energy storage unit 110 is converted into alternating current via the inverter 122, for example, and transmitted to the corresponding windings La, Lb, and Lc of the motor 121, thereby driving the motor. Figure 2 The arrows in FIG. 1 show the direction of current flow in the motor driving mode.

[0068] Based on the above, in the present application, by being set in the motor driving mode, the switch module electrically connects the first end and the second end of the inverter circuit of the inverter to the first end and the second end of the energy storage unit respectively, and the switch module is configured so that the inverter receives direct current from the energy storage unit and outputs alternating current for driving the motor, so that based on the configuration of the switch module, the motor can be well driven through the energy storage unit in a simple and convenient manner.

[0069] Figure 5 A schematic diagram of a power system 100 in a DC boost charging mode according to an embodiment of the present disclosure is shown.

[0070] Reference Figure 5 In some embodiments, in the DC boost charging mode, the external power supply module 200 is a DC power supply module 201, and the maximum output voltage of the DC power supply module 201 is less than the voltage of the energy storage unit.

[0071] The maximum output voltage of the DC power supply module 201 is lower than the voltage of the energy storage unit 200, for example, which can be described more specifically. For example, if the voltage of the energy storage unit is 500V DC, when charging the energy storage unit, if the maximum output voltage of the connected DC power supply module is 400V DC, which is lower than the voltage of the energy storage unit, the power supply module cannot fully charge the power battery. At this time, the voltage of the DC power supply module needs to be boosted before charging the energy storage unit.

[0072] It should be understood that the above only provides an example of the maximum output voltage of the DC power supply module 201 and the voltage of the energy storage unit.

[0073] The switch module is configured to enable the motor 121 and the inverter 122 to function as a boost charging circuit.

[0074] Based on the above, in the present application, by setting in the DC boost charging mode, when the maximum output voltage of the DC power supply module is less than the voltage of the energy storage unit, the switch module is configured so that the motor and the inverter are used as a boost charging circuit, so that a good and reliable boost charging process for the energy storage unit can be achieved by reusing the motor drive circuit as a boost charging circuit, and this multiplexing can effectively improve the integration of the circuit, avoid the introduction of additional boost charging circuits, improve the integration of the circuit, and simplify the circuit structure.

[0075] Reference Figure 5 In some embodiments, in the DC boost charging mode, the switch module 130 is configured to use the winding of the motor 121 as an inductor to charge the energy storage unit 110 .

[0076] In which, the switch module 130 is configured to electrically connect one end of at least one phase winding of the motor 121 to the first end 201-1 of the DC power supply module 201, and to electrically connect the first end 122-1 of the inverter circuit of the inverter 122 to the first end 110-1 of the energy storage unit 110, and to electrically connect the second end 122-2 of the inverter circuit to the second end 201-2 of the DC power supply module 201 and the second end 110-2 of the energy storage unit 110.

[0077] It should be understood that, according to actual needs, the switch module may, for example, electrically connect only one end of a single-phase winding of the motor 121 to the DC power supply module 110, or may electrically connect all multi-phase windings of the motor 121 to the DC power supply module 110. The embodiments of the present disclosure are not limited by the specific number of connections of the motor winding.

[0078] Fig. 6A It is shown in Figure 2 2 is a circuit diagram of an example power system 100 in the first stage of a DC boost charging mode. Figure 6B It is shown in Figure 2 A circuit diagram of an example power system 100 in the second stage of the DC boost charging mode.

[0079] Reference Fig. 6A and Figure 6B In the DC boost charging mode, the switches in the switch module are configured as follows: switch K1 is disconnected, switch K2 is closed, the single-pole multi-throw switches S1 and S2 are in the first configuration, and the single-pole multi-throw switches S3 and S4 are in the first configuration.

[0080] Specifically, the switch K1 is disconnected so that the AC power supply module is not connected to the power system. The switch K2 is closed so that the first end 201-1 of the DC power supply module is electrically connected to at least one phase winding of the motor 121, and the output of the DC power supply module in FIG6 is electrically connected to the three-phase windings La, Lb, and Lc of the motor 121 at the same time. The single-pole multi-throw switches S1 and S2 are in a first configuration (in which one end of the phase windings La and Lc is electrically connected to one end of the phase winding Lb) so that the three-phase windings of the motor form an inductor together to participate in the DC boost charging process. The single-pole multi-throw switches S3 and S4 are in a first configuration (in which the first end 122-1 of the inverter circuit of the inverter 122 is electrically connected to the first end 110-1 of the energy storage unit 110, and the second end of the inverter circuit is electrically connected to the second end 201-2 of the DC power supply module 201 and the second end 110-2 of the energy storage unit 110).

[0081] In addition, 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 inverter circuit and receive power from the DC power supply module.

[0082] Specifically, the boost charging process includes, for example, a first stage and a second stage. In the first stage, the external DC power supply module 201 charges the three-phase winding of the three-phase AC motor. The three-phase winding of the three-phase AC motor is used as an inductive energy storage element of the DC boost charging circuit, and the inductive energy storage element and the three-phase inverter 121 together form a DC boost charging circuit. At this time, for example, the switch control units G2, G4, and G6 in the three-phase inverter can be controlled to be in an on state, and the switch control units G1, G3, and G5 in the three-phase inverter can be controlled to be in an off state, so that the lower bridge arms of the three-phase bridge arms in the three-phase inverter are all in an on state, and the upper bridge arms of the three-phase bridge arms are all in an off state. At this time, the external DC power supply module, the three-phase windings Lc, Lb, and La of the three-phase AC motor and the three-phase lower bridge arms in the three-phase inverter form a first charging circuit, and the external DC power supply module, for example, charges the three-phase windings of the three-phase AC motor via the first charging circuit, wherein the current flows in the first charging circuit as shown in the attached Fig. 6A As shown in .

[0083] After charging the three-phase winding of the three-phase AC motor, for example, further, in the second stage, the switch control units G2, G4, and G6 in the three-phase inverter are all controlled to be in a disconnected state. At this time, the lower bridge arms of the three-phase bridge arms are all in a disconnected state, and the three-phase winding of the three-phase AC motor can be connected to the energy storage unit 110 via the diode in the upper bridge arm of the three-phase inverter, for example. At this time, the external DC power supply module, the three-phase winding Lc, Lb, and La of the three-phase AC motor and the three-phase upper bridge arm in the three-phase inverter form a second charging circuit, and the output voltage of the external DC power supply module is superimposed with the output voltage of the three-phase winding and used together to charge the power battery 111 in the energy storage unit 110, thereby achieving a voltage boost of the external DC power supply module, thereby achieving a stable and reliable boost charging process. The flow direction of the current in the second charging circuit is as shown in the attached figure. Figure 6B As shown in .

[0084] Based on the above, in the present application, in the DC boost charging mode, by setting the specific configuration of the switch module, the three-phase winding of the three-phase AC motor can be used as an inductive energy storage element in the DC boost charging circuit, so that the volume of the DC boost charging circuit can be greatly reduced while the boost charging function is well realized, and the structural complexity of the circuit is reduced.

[0085] Figure 7 A schematic diagram showing a power system 100 in an AC charging mode according to an embodiment of the present disclosure is shown.

[0086] Reference Figure 7 In some embodiments, in the AC charging mode, the external power supply module 200 is an AC power supply module 202 .

[0087] The AC power supply module may be, for example, a single-phase AC power supply module, or may also be a three-phase AC power supply module. The embodiments of the present disclosure are not limited by the specific type of the AC power supply module.

[0088] The switch module 130 is configured to enable the motor 121 and the inverter 122 to function as an AC charging circuit.

[0089] The AC charging circuit refers to a circuit structure used to supply electric energy to the energy storage unit based on the AC power supply module to realize charging of the energy storage unit.

[0090] For example, in the case where the external power supply module is a single-phase AC power supply module, the switch module is configured to electrically connect one end of at least one phase of the windings of the motor to the single-phase AC power supply module, and to electrically connect a first end of the inverter circuit of the inverter to a first end of the energy storage unit, and to electrically connect a second end of the inverter circuit to a second end of the energy storage unit, and at this time, the second end of the energy storage unit is, for example, electrically connected to the AC power supply module to form a single-phase AC charging circuit.

[0091] Alternatively, for example, when the external power supply module is a three-phase AC power supply module, the switch module is configured to electrically connect one end of the three-phase winding of the motor to the three-phase AC power supply module respectively, and to electrically connect the first end of the inverter circuit of the inverter to the first end of the energy storage unit, and to electrically connect the second end of the inverter circuit to the second end of the energy storage unit and the three-phase AC power supply module to form a three-phase AC charging circuit.

[0092] However, it should be understood that the above only provides an example of the configuration of the switch module, and the embodiments of the present disclosure are not limited thereto.

[0093] Based on the above, in the present application, when the external power supply module is an AC power supply module, by setting the configuration of the switch module, the motor and the inverter are used as an AC charging circuit, so that the motor drive circuit can be further reused in the AC charging mode, thereby minimizing the additional charging circuit, streamlining the circuit structure, and improving the circuit integration. At the same time, the power system can well meet the use requirements of AC charging and expand the functions of the power system.

[0094] In some embodiments, the AC charging mode includes a single-phase AC charging mode and a three-phase AC charging mode.

[0095] The single-phase AC charging mode refers to a process in which the external power supply module is a single-phase AC power supply module and the energy storage unit is charged based on single-phase AC power.

[0096] The three-phase AC charging mode refers to a process in which the external power supply module is a three-phase AC power supply module and the energy storage unit is charged based on three-phase AC power.

[0097] Based on the above, by further setting the AC charging mode to include a single-phase AC charging mode and a three-phase AC charging mode, the function of the power system can be further expanded, so that the power system can meet the application scenarios of various different types of AC charging such as single-phase and multi-phase.

[0098] In some embodiments, in the single-phase AC charging mode, the external power supply module 202 is a single-phase AC power supply module 2021 .

[0099] The switch module 130 is configured to electrically connect one end of at least one phase of the winding of the motor 121 to the AC power supply module 202 (here, the single-phase AC power supply module 2021), and to electrically connect the first end of the inverter circuit of the inverter 122 to the energy storage unit.

[0100] The first end 110-1 of the inverter circuit 110 electrically connects the second end of the inverter circuit to the second end 110-2 of the energy storage unit 110. And wherein, the second end 110-2 of the energy storage unit 110 is also configured to be electrically connected to the AC power supply module 202 (here, the single-phase AC power supply module 2021).

[0101] It should be understood that, according to actual needs, the switch module can, for example, electrically connect only one end of a single-phase winding of the motor 121 to the single-phase AC power supply module, or can also electrically connect all multi-phase windings of the motor 121 to the single-phase AC power supply module. The embodiments of the present disclosure are not limited by the specific number of connections of the motor winding.

[0102] Figure 8 It is shown in Figure 2 The circuit diagram of the exemplary charging system 100 in the single-phase AC charging mode is shown below. Figure 8 The single-phase AC charging mode will be described in more detail.

[0103] Reference Figure 8 In the single-phase AC charging mode, the switches in the switch module are configured as follows: switches K1 and K2 are disconnected, single-pole multi-throw switches S1 and S2 are in the first configuration, and single-pole multi-throw switches S3 and S4 are in the second configuration.

[0104] Specifically, switches K1 and K2 are disconnected so that the DC power supply module is not connected to the power system. SPMT switches S1 and S2 are in a first configuration (in which one end of the phase windings La and Lc are electrically connected to one end of the phase winding Lb) so that one end of the three-phase winding of the motor is electrically connected to the single-phase AC power supply module to participate in the single-phase AC charging process. SPMT switches S3 and S4 are in a second configuration (in which the first end 122-1 of the inverter circuit of the inverter 122 is electrically connected to the first end 110-1 of the energy storage unit 110 via a branch different from the first configuration, and the second end 122-2 of the inverter circuit is electrically connected to the second end of the DC power supply module 201 via a branch different from the first configuration).

[0105] In addition, 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 inverter circuit and receive power from the single-phase AC power supply module.

[0106] Specifically, the single-phase AC power from the single-phase AC supply module enters the three-phase winding of the motor 121 via the configuration of the switch module 130 (it should be understood that Figure 8 The three-phase windings shown in the figure are all electrically connected to the single-phase AC power supply module. However, according to actual needs, only one or two phases of the three-phase windings can be electrically connected to the single-phase AC power supply module). Afterwards, the inverter 122 connected to the motor winding rectifies the AC power and obtains the corresponding DC power. The DC power output by the inverter is supplied to the energy storage unit via the configuration of the switch module 130. The flow direction of the current in the single-phase AC charging mode is as shown in the attached figure. Figure 8 As shown in .

[0107] The power system further includes a DC / DC converter 140 disposed between the inverter and the energy storage unit, a protection capacitor connected in parallel with the DC / DC converter 140, and a related conversion connection circuit (the conversion connection circuit includes, for example, Figure 8 , and a diode connected in reverse parallel to the two transistors). The DC / DC converter 140 is configured to adjust the voltage of the DC power obtained from the output end of the inverter. 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, it is necessary to adjust the voltage of the DC power supplied to the energy storage unit accordingly. Therefore, the DC / DC converter 140 is set to boost the DC power output by the inverter.

[0108] Based on the above, in the present application, in the single-phase AC charging mode, the switch module is set to electrically connect one end of at least one phase winding in the motor winding to the single-phase AC power supply module, and the first end of the inverter circuit of the inverter is electrically connected to the first end of the energy storage unit, and the second end of the inverter circuit is electrically connected to the second end of the energy storage unit, so that a good single-phase AC charging process is achieved by well-reusing the motor drive circuit, the circuit structure is simplified, and the flexibility of the power system is improved.

[0109] In some embodiments, in the three-phase AC charging mode, the external power supply module is a three-phase AC power supply module 2022 .

[0110] And wherein, the switch module 130 is configured to electrically connect one end of the three-phase winding of the motor 121 to the three-phase AC power supply module respectively, and to electrically connect the first end of the inverter circuit of the inverter 122 to the first end 110-1 of the energy storage unit 110, and to electrically connect the second end of the inverter circuit to the second end 110-2 of the energy storage unit 110 and the three-phase AC power supply module.

[0111] Fig. 9 It is shown in Figure 2 The circuit diagram of the exemplary charging system 100 in the three-phase AC charging mode is shown below. Fig. 9 This three-phase AC charging mode will be described in more detail.

[0112] Reference Fig. 9 , in the three-phase AC charging mode, the switch configuration in the switch module is: switches K1 and K2 are disconnected, the single-pole multi-throw switches S1 and S2 are in the second configuration, and the single-pole multi-throw switches S3 and S4 are in the second configuration.

[0113] Specifically, switches K1 and K2 are disconnected so that the DC power supply module is not connected to the power system. SPMT switches S1 and S2 are in the second configuration (in which one end of the phase windings La and Lc are electrically connected to the corresponding end of the three-phase AC power supply module 2022), so that one end of the three-phase winding of the motor is electrically connected to the three-phase AC power supply module to participate in the three-phase AC charging process. SPMT switches S3 and S4 are in the second configuration (in which the first end 122-1 of the inverter circuit of the inverter 122 is electrically connected to the first end 110-1 of the energy storage unit 110 via a branch different from the first configuration, and the second end 122-2 of the inverter circuit is electrically connected to the three-phase AC power supply module 2022 and the second end 110-2 of the energy storage unit 110 via a branch different from the first configuration).

[0114] In addition, 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 inverter circuit and receive power from the three-phase AC power supply module.

[0115] Specifically, the three-phase AC power from the three-phase AC supply module enters the winding of the motor 121 through the configuration of the switch module 130, and then the inverter 122 connected to the motor winding rectifies the AC power and obtains the corresponding DC power. The DC power output by the inverter supplies power to the energy storage unit through the configuration of the switch module 130. The flow direction of the current in the three-phase AC charging mode is as shown in the attached figure. Fig. 9 As shown in .

[0116] The power system further includes a DC / DC converter 140 disposed between the inverter and the energy storage unit, a protection capacitor connected in parallel with the DC / DC converter 140, and a related conversion connection circuit (the conversion connection circuit includes, for example, Fig. 9 The two transistors shown in the figure, and the diodes connected in reverse parallel with the two transistors, to realize the transmission of direct current between the inverter and the DC / DC converter 140). The DC / DC converter 140 is configured to realize the voltage adjustment of the direct current obtained from the output end of the inverter. 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, it is necessary to adjust the voltage of the direct current supplied to the energy storage unit accordingly. Therefore, the DC / DC converter 140 is set to boost the direct current output by the inverter.

[0117] Based on the above, in the present application, in the three-phase AC charging mode, the switch module is set to electrically connect one end of the three-phase winding of the motor to the three-phase AC power supply module, and the first end of the inverter circuit of the inverter is electrically connected to the first end of the energy storage unit, and the second end of the inverter circuit is electrically connected to the second end of the energy storage unit and the three-phase AC power supply module, so that through a simple configuration of the switch module, the motor drive circuit can be reused to achieve a reliable three-phase AC charging process, simplify the circuit structure, and expand the power system function.

[0118] In some embodiments, as described above in conjunction with Figure 8 and Fig. 9 As described in detail, the power system 100 further includes a DC / DC converter 140 disposed between the inverter 122 and the energy storage unit 110 .

[0119] The DC / DC converter 140 is configured to adjust the voltage of the DC power obtained from the output end of the inverter. 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 DC / DC converter 140 is provided to boost the DC power output by the inverter.

[0120] Based on the above, by setting a DC / DC converter between the inverter and the energy storage unit, in the AC charging mode (for example, single-phase AC charging mode, three-phase AC charging mode), the voltage of the DC power supplied to the energy storage unit can be timely and reliably adjusted according to the real-time charging situation and based on the continuous increase in the voltage of the power battery in the energy storage unit, thereby achieving a stable and reliable AC charging process.

[0121] In some embodiments, the power system 100 is further configured to be in a DC bypass charging mode.

[0122] It should be understood that the DC bypass charging mode refers to a mode in which the energy storage unit is directly charged without performing a voltage boost process when the maximum output voltage of the external DC power supply module is greater than or equal to the voltage of the energy storage unit.

[0123] Specifically, in the DC bypass charging mode, the external power supply module is a DC power supply module whose maximum output voltage is greater than or equal to the voltage of the energy storage unit. For example, if the voltage of the energy storage unit is 500V DC, when charging the energy storage unit, if the maximum output voltage of the connected DC power supply module is 800V DC, which is greater than the voltage of the energy storage unit, the power supply module can directly fully charge the power battery.

[0124] And wherein, the switch module 130 is configured to electrically connect the DC power supply module 201 to the energy storage unit 110 via a bypass circuit, so that the motor drive circuit 120 does not serve as the charging circuit.

[0125] Fig.10 Shows Figure 2 An example circuit diagram of an electric power system 100 in a DC bypass charging mode. Fig.10 In the DC bypass charging mode, the switches in the switch module are configured as follows: switch K1 is closed, switch K2 is open, the single-pole multi-throw switches S1 and S2 are in the third configuration, and the single-pole multi-throw switches S3 and S4 are in the first configuration.

[0126] Specifically, the switch K2 is disconnected (so that the winding Lb of the motor is not electrically connected to the DC power supply module 201), and the single-pole multi-throw switches S1 and S2 are in the third configuration (in this configuration, the windings La and Lc of the three-phase winding of the motor are not electrically connected to the DC power supply module 201), so that the DC power supply module is not electrically connected to the motor drive circuit, so that the motor drive circuit does not serve as a charging circuit. The switch K1 is closed, and the single-pole multi-throw switches S3 and S4 are in the first configuration, so as to electrically connect the DC power supply module 201 to the energy storage unit 110 via the bypass circuit.

[0127] In the energy storage unit 110, switches K4 and K6 are closed, and switch K5 is opened, so as to be well electrically connected to the inverter circuit and receive power from the DC power supply module. The flow direction of the current in the DC bypass charging mode is as shown in the attached figure. Fig.10 As shown in .

[0128] Based on the above, in the present application, by setting in a DC bypass charging mode, by configuring the switch module, the DC power supply module is electrically connected to the energy storage unit via a bypass circuit, and the motor drive circuit does not serve as the charging circuit, so that when the external power supply module is a DC power supply module with a maximum output voltage greater than or equal to the voltage of the energy storage unit, the charging process of the energy storage unit can be realized in a simple and convenient manner via the bypass circuit.

[0129] In some embodiments, the switch module includes a switch device.

[0130] The switch device refers to an electronic device used as a switch, such as a single-pole single-throw switch, a single-pole multi-throw switch, etc. It should be understood that the embodiments of the present disclosure are not limited by the type of the switch device.

[0131] The switch device may be formed by a relay, for example, or may be composed of other elements. The embodiments of the present disclosure are not limited by the specific composition of the switch device.

[0132] The switch module may include, for example, one switch device, or may include multiple switch devices. The embodiments of the present disclosure are not limited by the specific number of the switch devices.

[0133] Based on the above, by setting the switch module to include a switch device, for example, the switch module can be flexibly controlled to be in different configurations in a simple and convenient manner by controlling the conduction state of the switch device, thereby realizing the selection of different working modes of the power system.

[0134] In some embodiments, the switching device comprises a relay.

[0135] The relay refers to an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement.

[0136] Based on the above, in the present application, by setting the switch device to include a relay, on the one hand, the switch device can be formed in a simple and convenient manner; on the other hand, flexible and reliable switch control can be achieved through the relay, thereby achieving flexible configuration of the switch module.

[0137] According to another aspect of the present disclosure, a vehicle is proposed, the vehicle comprising the power system as described above and having the functions as described above. 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), an extended range electric vehicle (Range extendedEV), or a fuel cell vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle.

[0138] 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.

[0139] 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.

[0140] 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, the power system comprising: Energy storage unit; A motor drive circuit, the motor drive circuit comprising a motor and an inverter electrically connected to the motor; a switch module, wherein the motor drive circuit is electrically connected to the energy storage unit via the switch module, and the motor drive circuit is operably electrically connected to the external power supply module via the switch module; Wherein, based on the configuration of the switch module, the power system is selectively in one of a motor drive mode, a DC boost charging mode and an AC charging mode; And wherein, in the DC boost charging mode and the AC charging mode, the motor drive circuit is used as a part of the charging circuit.

2. The power system according to claim 1, wherein: In the motor driving mode, the switch module electrically connects the first end and the second end of the inverter circuit of the inverter to the first end and the second end of the energy storage unit respectively, and the switch module is configured to enable the inverter to receive direct current from the energy storage unit and output alternating current for driving the motor.

3. The power system according to claim 1, wherein: In the DC boost charging mode, the external power supply module is a DC power supply module, and the maximum output voltage of the DC power supply module is less than the voltage of the energy storage unit; The switch module is configured to enable the motor and the inverter to function as a boost charging circuit.

4. The power system according to claim 3, wherein: In the DC boost charging mode, the switch module is configured to use the winding of the motor as an inductor to charge the energy storage unit; The switch module is configured to electrically connect one end of at least one phase winding of the motor to the DC power supply module, and to electrically connect a first end of the inverter circuit of the inverter to a first end of the energy storage unit, and to electrically connect a second end of the inverter circuit to the DC power supply module and a second end of the energy storage unit.

5. The power system according to claim 1, wherein: In the AC charging mode, the external power supply module is an AC power supply module; The switch module is configured to enable the motor and the inverter to be used as an AC charging circuit.

6. The power system according to claim 1 or 5, wherein: The AC charging mode includes a single-phase AC charging mode and a three-phase AC charging mode.

7. The power system according to claim 6, wherein: In the single-phase AC charging mode, the external power supply module is a single-phase AC power supply module. And wherein, the switch module is configured to electrically connect one end of at least one phase winding of the motor to the single-phase AC power supply module, and to electrically connect a first end of the inverter circuit of the inverter to a first end of the energy storage unit, and to electrically connect a second end of the inverter circuit to a second end of the energy storage unit.

8. The power system according to claim 6, wherein: In the three-phase AC charging mode, the external power supply module is a three-phase AC power supply module. And wherein, the switch module is configured to electrically connect one end of the three-phase winding of the motor to the three-phase AC power supply module respectively, and to electrically connect the first end of the inverter circuit of the inverter to the first end of the energy storage unit, and to electrically connect the second end of the inverter circuit to the second end of the energy storage unit and the three-phase AC power supply module.

9. The power system according to claim 7 or 8, wherein: The power system further includes a DC / DC converter disposed between the inverter and the energy storage unit.

10. The power system according to claim 1, wherein: The power system is further configured to be in a DC bypass charging mode, in which the external power supply module is a DC power supply module having a maximum output voltage greater than or equal to a voltage of the energy storage unit; And wherein, the switch module is configured to electrically connect the DC power supply module to the energy storage unit via a bypass circuit, so that the motor drive circuit does not serve as the charging circuit.

11. The power system according to claim 1, wherein: The switch module includes a switch device.

12. The power system according to claim 11, wherein: The switching device includes a relay.

13. A vehicle comprising an electric power system according to one of claims 1 to 12.

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