Energy conversion circuits and vehicles

Abstract

This application discloses an energy conversion circuit and a vehicle, belonging to the field of charging and discharging circuit technology. The energy conversion circuit includes: a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface provides an input voltage to the energy conversion circuit. The voltage input terminals of both the first and second motor units are connected to the voltage output terminal of the boost DC module via transformers. The energy conversion circuit has a first state for charging the battery module and a second state for driving external devices through the boost DC module, the first motor unit, and the second motor unit. In the first state, one or more bridge arms of the first and second motor units are configured as PFC modules; in the second state, both bridge arms of the first and second motor units are configured as drive modules.

Description

Technical Field

[0001] This application belongs to the field of charging and discharging circuit technology, specifically relating to an energy conversion circuit and a vehicle. Background Technology

[0002] The energy conversion methods of electric vehicles include charging modes for charging electric vehicles and starting electric vehicles through the battery pack inside the electric vehicle. The circuit design includes charging circuits and drive circuits. In existing circuits, the charging circuit and the drive circuit are two independent circuits.

[0003] In terms of working hours, the charging working hours and the driving working hours do not overlap. This results in at least one part of the charging and driving circuits not working, leading to wasted components and increasing the overall cost of the vehicle. Summary of the Invention

[0004] The purpose of this application is to provide an energy conversion circuit and vehicle that can solve the problem of low utilization rate of energy conversion circuit devices in existing electric vehicles.

[0005] In a first aspect, this application provides an energy conversion circuit, comprising: a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface is connected to the first motor unit and the second motor unit, and is used to provide an input voltage to the energy conversion circuit. The first motor unit, the second motor unit, the boost DC module, and the battery module are connected sequentially, and the voltage input terminals of the first motor unit and the second motor unit are both connected to the voltage output terminal of the boost DC module through a transformer. The energy conversion circuit has a first state of charging the battery module and a second state of driving external devices through the boost DC module, the first motor unit, and the second motor unit. The first motor unit and the second motor unit each include multiple bridge arms. In the first state, one or more bridge arms of the first motor unit and the second motor unit are configured as PFC modules. In the second state, all bridge arms of the first motor unit and the second motor unit are configured as drive modules.

[0006] Optionally, the energy conversion circuit further includes a filter, the charging interface is connected to the first input terminal and the second input terminal of the filter, the first output terminal of the filter is connected to the first motor unit, and the second output terminal of the filter is connected to the second motor unit;

[0007] The first motor unit includes a first controller and a first motor, and the second motor unit includes a second controller and a second motor. Both the first controller and the second controller are provided with a three-phase bridge arm, and both the first motor and the second motor are provided with a three-phase winding.

[0008] One end of each winding of the first motor is connected to each arm of the first controller in a corresponding manner, and the other end of each winding of the first motor is connected to each other as the first connection point;

[0009] One end of each winding of the second motor is connected to each bridge arm of the second controller in a corresponding manner, and the other end of each winding of the second motor is connected to each other as a second connection point;

[0010] Any arm of the first controller is connected to the voltage input terminal of the first motor unit, and any arm of the second controller is connected to the voltage input terminal of the second motor unit.

[0011] Optionally, the three-phase bridge arms of the first controller include a first bridge arm, a second bridge arm, and a third bridge arm, the third bridge arm being connected to the voltage input terminal of the first motor unit; the three-phase bridge arms of the second controller include a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm, the fourth bridge arm being connected to the voltage input terminal of the second motor unit; and a first switch is provided between the third bridge arm and the three-phase winding connected to the third bridge arm, and a second switch is provided between the fourth bridge arm and the three-phase winding connected to the fourth bridge arm; when the energy conversion circuit is in a first state, the first switch and the second switch are in an open state; when the energy conversion circuit is in a second state, the first switch and the second switch are in a closed state.

[0012] Optionally, the first output terminal of the filter is connected to the first connection point, and the second output terminal of the filter is connected to the second connection point; when the energy conversion circuit is in the first state, the first and second bridge arms of the first controller, and the fifth and sixth bridge arms of the second controller are configured as PFC modules.

[0013] Optionally, the first output terminal of the filter is connected to the first bridge arm, and the second output terminal of the filter is connected to the fifth bridge arm; when the energy conversion circuit is in the first state, the first bridge arm of the first controller and the sixth bridge arm of the second controller are configured as PFC modules.

[0014] Optionally, a first inductor is further provided between the second output terminal of the filter and the second connection point.

[0015] Optionally, a second inductor is further provided between the second output terminal of the filter and the fifth bridge arm.

[0016] Optionally, a third switch and a fourth switch are further provided between the charging interface and the filter. One end of the third switch is connected to the first output terminal of the charging interface, and the other end of the first switch is connected to the first input terminal of the filter. One end of the fourth switch is connected to the second output terminal of the charging interface, and the other end of the fourth switch is connected to the second input terminal of the filter. When the energy conversion circuit is in the first state, the third switch and the fourth switch are in the on state. When the energy conversion circuit is in the second state, the third switch and the fourth switch are in the off state.

[0017] Optionally, the first end of the transformer is connected to the first motor unit via a fifth switch, and the second end of the transformer is connected to the boost DC module via a sixth switch. When the energy conversion circuit is in the first state, the fifth and sixth switches are in the on state; when the energy conversion circuit is in the second state, the fifth and sixth switches are in the off state.

[0018] Secondly, this application provides a vehicle including the energy conversion circuit described in any of the first aspects.

[0019] In this application, the energy conversion circuit includes a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface connects the first motor unit and the second motor unit. The first motor unit, the second motor unit, the boost DC module, and the battery module are connected sequentially. The voltage input terminals of both the first and second motor units are connected to the voltage output terminal of the boost DC module via transformers. The charging interface provides input voltage to the energy conversion circuit. By reusing the power devices in the first and second motor units, in the first state where the energy conversion circuit is charging the battery module, one or more bridge arms of the first and second motor units are configured as PFC modules. In the second state, both bridge arms of the first and second motor units are configured as drive modules. This simplifies the circuit structure and improves the utilization rate of the power devices in the energy conversion circuit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an energy conversion circuit provided in this embodiment;

[0021] Figure 2 This is a schematic diagram of the first circuit connection of the energy conversion circuit in this embodiment;

[0022] Figure 3 This is a schematic diagram of the second circuit connection of the energy conversion circuit in this embodiment;

[0023] Figure 4 This is a schematic diagram of the third type of circuit connection for the energy conversion circuit in this embodiment;

[0024] Figure 5 This is a schematic diagram of the fourth circuit connection of the energy conversion circuit in this embodiment;

[0025] Figure 6 This is a schematic diagram of the boost DC module in this embodiment;

[0026] Figure 7 This is a structural block diagram of the vehicle in this embodiment. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0028] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] The energy conversion circuit and vehicle provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0030] Figure 1 This is a schematic diagram of an energy conversion circuit provided in this embodiment, for reference. Figure 1 The energy conversion circuit includes: a charging interface 101, a first motor unit 102, a second motor unit 103, a boost DC module 104, and a battery module 105. The charging interface 101 is connected to the first motor unit 102 and the second motor unit 103. The first motor unit 102, the second motor unit 103, the boost DC module 104, and the battery module 105 are connected in sequence. The voltage input terminal In1 of the first motor unit and the voltage input terminal In2 of the second motor unit are both connected to the voltage output terminal of the boost DC module through a transformer T1.

[0031] In this embodiment, the motor unit may include multiple units. Thus, in a system with two or more motor units connected in parallel, a PFC circuit can be constructed by reusing the components of the motor unit, reusing the controller switch of the motor, and the motor winding of the motor unit, thereby achieving efficient utilization of the circuit components.

[0032] In this embodiment, the charging interface is used to provide input voltage to the energy conversion circuit. The charging interface can be connected to the power grid to input the voltage provided by the AC power grid to the energy conversion circuit.

[0033] In this embodiment, the energy conversion circuit has a first state of charging the battery module and a second state of driving external devices through the boost DC module, the first motor unit and the second motor unit. That is, when the energy conversion circuit is in the first state, the battery module is charged through the grid voltage connected to the charging interface. When the energy conversion circuit is in the second state, the electrical energy stored in the battery module is output through the boost DC module, the first motor unit and the second motor unit to drive the vehicle.

[0034] In this embodiment, the first motor unit is an electric motor unit, and the second motor unit is a generator unit. When the energy conversion circuit is in the second state, the second motor unit is used to transmit the electrical energy stored in the battery module to the first motor unit, thereby driving the vehicle.

[0035] The first and second motor units each include multiple bridge arms. In the first state of the energy conversion circuit, one or more bridge arms of the first and second motor units are configured as PFC modules, capable of rectifying the AC grid input voltage into high-voltage DC, ensuring that the current and voltage at the AC input terminal are in phase. In the second state of the energy conversion circuit, the bridge arms of both the first and second motor units are configured as drive modules, converting the electrical energy stored in the battery module into the vehicle's kinetic energy through the first and second motor units.

[0036] In this embodiment, the energy conversion circuit further includes a filter 106. The charging interface is connected to the first input terminal and the second input terminal of the filter. The first output terminal of the filter is connected to the first motor unit, and the second output terminal of the filter is connected to the second motor unit. The filter is used to filter the input grid voltage.

[0037] In this embodiment, the first motor unit includes a first controller and a first motor, and the second motor unit includes a second controller and a second motor. Both the first controller and the second controller are provided with three-phase bridge arms, and both the first motor and the second motor are provided with three-phase windings.

[0038] Figure 2This is a schematic diagram of the first circuit connection of the energy conversion circuit in this embodiment. One end of each winding of the first motor is connected to each bridge arm of the first controller, and the other ends of each winding of the first motor are connected to each other as a first connection point. One end of each winding of the second motor is connected to each bridge arm of the second controller, and the other ends of each winding of the second motor are connected to each other as a second connection point. Any bridge arm of the first controller is connected to the voltage input terminal of the first motor unit, and any bridge arm of the second controller is connected to the voltage input terminal of the second motor unit.

[0039] In this embodiment, the three-phase bridge arm of the first controller includes a first bridge arm, a second bridge arm, and a third bridge arm, wherein each bridge arm includes two switches connected in series. The first bridge arm includes switches Q25 and Q26, the second bridge arm includes switches Q24 and Q23, and the third bridge arm includes switches Q22 and Q21. The three-phase windings of the first motor include L23, L22, and L21.

[0040] In this embodiment, one end of each winding of the first motor is connected to each bridge arm of the first controller in a one-to-one correspondence. For example, one end of L23 is connected between the two switching transistors Q25 and Q26 of the first bridge arm, one end of L22 is connected between the two switching transistors Q24 and Q23 of the second bridge arm, and one end of L21 is connected between the two switching transistors Q22 and Q21 of the third bridge arm. The other ends of L23, L22, and L21 are connected to the same point, which serves as the first connection point.

[0041] In this embodiment, the three-phase bridge arms of the second controller include a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm, wherein each bridge arm includes two switches connected in series. The fourth bridge arm includes switches Q35 and Q36, the fifth bridge arm includes switches Q34 and Q33, and the sixth bridge arm includes switches Q32 and Q31. The three-phase windings of the second motor include L33, L32, and L31.

[0042] In this embodiment, one end of each winding of the second motor is connected to each bridge arm of the second controller in a one-to-one correspondence. For example, one end of L33 is connected between the two switching transistors Q35 and Q36 of the fourth bridge arm, one end of L32 is connected between the two switching transistors Q34 and Q33 of the fifth bridge arm, and one end of L31 is connected between the two switching transistors Q32 and Q31 of the sixth bridge arm. The other ends of L33, L32, and L31 are connected to the same point as the second connection point.

[0043] In this embodiment, any arm of the first controller is connected to the voltage input terminal of the first motor unit, and any arm of the second controller is connected to the voltage input terminal of the second motor unit. One arm of the first controller and one arm of the second controller can be reused, so that one arm of the first controller, one arm of the second controller, the boost DC module, and the transformer form a full-bridge DC-DC converter topology during charging.

[0044] In this embodiment, the third bridge arm is connected to the voltage input terminal In1 of the first motor unit, and the fourth bridge arm is connected to the voltage input terminal In2 of the second motor unit. At this time, the third bridge arm, the fourth bridge arm, the boost DC module and the transformer T1 form a full-bridge DC-DC converter topology during the charging process to realize high-voltage DC voltage control and charge the power battery.

[0045] In this embodiment, when the third bridge arm is connected to the voltage input terminal In1 of the first motor unit and the fourth bridge arm is connected to the voltage input terminal In2 of the second motor unit, a first switch K10 is provided between the third bridge arm and the three-phase winding connected to the third bridge arm, and a second switch K11 is provided between the fourth bridge arm and the three-phase winding connected to the fourth bridge arm. The first switch K10 and the second switch K11 can be relay switches. It should be noted that when other bridge arms of the first controller are connected to the voltage input terminal of the first motor unit, and other bridge arms of the second controller are connected to the voltage input terminal of the second motor unit, the first switch K10 is located between the bridge arm connected to the voltage input terminal of the first motor unit and the three-phase winding connected to that bridge arm. Similarly, the second switch K11 is located between the bridge arm connected to the voltage input terminal of the second motor unit and the three-phase winding connected to that bridge arm.

[0046] In this embodiment, when the energy conversion circuit is in the first state, the first switch K10 and the second switch K11 are in the off state, and when the energy conversion circuit is in the second state, the first switch K10 and the second switch K11 are in the on state.

[0047] Based on the above embodiments, the first output terminal of the filter in this embodiment is connected to the first connection point, and the second output terminal of the filter is connected to the second connection point; when the energy conversion circuit is in the first state, the first and second bridge arms of the first controller, and the fifth and sixth bridge arms of the second controller are configured as PFC modules.

[0048] refer to Figure 2 The N-phase and L-phase of the AC mains power are connected to the connection points of the three-phase windings L23, L22, and L21 of the first motor and the connection points of the three-phase windings L33, L32, and L31 of the second motor through a filter. The first switch K10 is connected in series with the winding L21, and the second switch K11 is connected in series with the winding L33.

[0049] During charging, K10 and K11 remain disconnected, K12 and K13 remain engaged, and Q23, Q24, Q25, Q26, Q31, Q32, Q33, and Q34 operate according to PFC logic. Q35 and Q21, and Q22 and Q36, have opposite operating states: during charging, Q35 and Q21 remain on while Q22 and Q36 remain off, or Q35 and Q21 remain off while Q22 and Q36 remain on.

[0050] In this embodiment, the switching transistor of the second controller can be used as a fast transistor, and Q33 and Q34 of the fifth bridge arm and Q31 and Q32 of the sixth bridge arm are connected in an alternating parallel manner. Q25 and Q26 of the first bridge arm and Q23 and Q24 of the second bridge arm act as slow transistor bridge arms to form a closed loop, which can reduce the input and output current ripple. The windings L22 and L23 of the first motor can provide sufficient inductance to prevent current discontinuity.

[0051] In one example, the switching transistor of the first controller can be used as a fast transistor, and the switching transistor of the second controller can be used as a slow transistor bridge arm to form a closed loop.

[0052] In this embodiment, the third bridge arm, the fourth bridge arm, the boost DC module, and the transformer T1 form a full-bridge DC-DC converter topology during the charging process to achieve high-voltage DC voltage control and charge the battery module.

[0053] The PFC module in this embodiment can improve the output voltage after AC current rectification, and then adjust the voltage through the full-bridge DC-DC converter topology to output a wider voltage range.

[0054] Figure 2 The operating states of each switch and the switching transistor of the bridge arm in the energy conversion circuit under the first and second states are shown in Table 1.

[0055] Table 1

[0056]

[0057] During operation, K10 and K11 remain on, K12 and K13 remain off, and Q21, Q22, Q23, Q24, Q25, Q26, Q31, Q32, Q33, Q34, Q35, and Q36 are switched on / off according to the motor's logic.

[0058] In this embodiment, the motor logic operation mode includes controlling the on / off state of Q21, Q22, Q23, Q24, Q25, and Q26 via PWM signals to achieve the motor output function, and controlling the on / off state of Q31, Q32, Q33, Q34, Q35, and Q36 via PWM signals to achieve the generator output function, and inverting the DC power from the battery module into AC power output to drive the motor and achieve the vehicle driving function.

[0059] Figure 3 This is a schematic diagram of a second circuit connection for the energy conversion circuit in this embodiment. In this embodiment, the first output terminal of the filter is connected to the first bridge arm, and the second output terminal of the filter is connected to the fifth bridge arm, as shown below. Figure 3 As shown, one phase of the AC mains power is connected between the switching transistors Q25 and Q26 of the first bridge arm through the first output terminal of the filter, and the other phase of the AC mains power is connected between the switching transistors Q33 and Q34 of the fifth bridge arm through the second output terminal of the filter.

[0060] In this embodiment, when the energy conversion circuit is in the first state, the first bridge arm of the first controller and the sixth bridge arm of the second controller are configured as PFC modules. That is, in the charging state, Q31, Q32 and Q25, Q26 are configured as PFC modules.

[0061] like Figure 3 As shown, in the charging state of this embodiment, the L phase and N phase of the AC mains power are connected between the switching transistors Q25 and Q26 of the first bridge arm and between the switching transistors Q33 and Q34 of the fifth bridge arm, respectively. The winding L21 of the first motor is connected in series with the first switch K10, and the winding L33 of the second motor is connected in series with the second switch K11.

[0062] In this embodiment, during charging, K10 and K11 remain disconnected, while K12 and K13 remain on. Q33 and Q34 remain disconnected; Q35 and Q36 alternately have one open and one closed; Q23 and Q24 remain disconnected; and Q25, Q26, Q31, and Q32 operate according to PFC logic. When the switching transistors of the second controller act as fast transistors, Q33 and Q34 remain off, K11 remains off, and Q35 and Q36 alternately have one on and one off. This allows the bridge arms Q31 and Q32 to form the fast transistor bridge arms of PFC. Simultaneously, the bridge arms Q23 and Q24 remain disconnected, K10 remains off, and Q21 and Q22 alternately have one open and one closed. This allows the bridge arms Q25 and Q26 to act as slow transistor bridge arms, forming a closed loop. Sufficient inductance can be provided by the two windings L31 and L32 of the second motor to prevent current discontinuity. The third and fourth bridge arms, the boost DC module, and the transformer T1 form a full-bridge DC-DC converter topology during charging, enabling high-voltage DC control to charge the battery module. In this embodiment, the switching transistor of the first controller can also act as the fast bridge arm, and the second controller can be configured as the slow bridge arm.

[0063] When in motion, K10 and K11 remain engaged, while K12 and K13 remain disengaged. Q21, Q22, Q23, Q24, Q25, Q26, Q31, Q32, Q33, Q34, Q35, and Q36 are switched on / off according to the motor's logic.

[0064] Figure 3 The operating states of each switch and the switching transistor of the bridge arm in the energy conversion circuit under the first and second states are shown in Table 2.

[0065] Table 2

[0066]

[0067] Figure 4 This is a schematic diagram of the third circuit connection of the energy conversion circuit in this embodiment. In this embodiment, Figure 4 The energy conversion circuit shown is in Figure 2 The energy conversion circuit shown is modified by adding a first inductor L24, which can further reduce current ripple. The first inductor L24 is positioned between the second output terminal and the second connection point of the filter.

[0068] refer to Figure 4The N-phase and L-phase AC mains power are connected via a filter to the connection points of the three-phase windings L23, L22, L21 of the first motor and the connection points of the three-phase windings L33, L32, L31 of the second motor, respectively. A first switch K10 is connected in series with winding L21, and a second switch K11 is connected in series with winding L33. During charging, K10 and K11 remain open, K12 and K13 remain closed, and Q23, Q24, Q25, Q26, Q31, Q32, Q33, and Q34 operate according to PFC logic. Q35 and Q21, and Q22 and Q36, have opposite operating states: during charging, Q35 and Q21 remain on, and Q22 and Q36 remain off, or Q35 and Q21 remain off, and Q22 and Q36 remain on.

[0069] In this embodiment, the switching transistor of the second controller can be used as a fast transistor, and Q33 and Q34 of the fifth bridge arm and Q31 and Q32 of the sixth bridge arm are connected in an alternating parallel manner. Q25 and Q26 of the first bridge arm and Q23 and Q24 of the second bridge arm act as slow transistor bridge arms to form a closed loop, which can reduce the input and output current ripple. The windings L22 and L23 of the first motor can provide sufficient inductance to prevent current discontinuity.

[0070] In one example, the switching transistor of the first controller can be used as a fast transistor, and the switching transistor of the second controller can be used as a slow transistor bridge arm to form a closed loop.

[0071] In this embodiment, the third bridge arm, the fourth bridge arm, the boost DC module, and the transformer T1 form a full-bridge DC-DC converter topology during the charging process to achieve high-voltage DC voltage control and charge the battery module.

[0072] During operation, K10 and K11 remain on, while K12 and K13 remain off. Q21, Q22, Q23, Q24, Q25, Q26, Q31, Q32, Q33, Q34, Q35, and Q36 are switched on / off according to the motor's logic.

[0073] Figure 4 The operating states of each switch and the switching transistor of the bridge arm in the energy conversion circuit under the first and second states are shown in Table 3.

[0074] Table 3

[0075]

[0076] Figure 5 This is a schematic diagram of the fourth circuit connection of the energy conversion circuit in this embodiment. In this embodiment, Figure 5 The energy conversion circuit shown is in Figure 3The energy conversion circuit shown is modified by adding a second inductor L25, which can further reduce current ripple. The first inductor L25 is positioned between the second output terminal of the filter and the fifth bridge arm.

[0077] In the charging state of this embodiment, the L phase and N phase of the AC mains power are connected between the switching transistors Q25 and Q26 of the first bridge arm and between the switching transistors Q33 and Q34 of the fifth bridge arm, respectively. The winding L21 of the first motor is connected in series with the first switch K10, and the winding L33 of the second motor is connected in series with the second switch K11.

[0078] In this embodiment, during charging, K10 and K11 remain disconnected, while K12 and K13 remain on. Q33 and Q34 remain disconnected; Q35 and Q36 alternately have one open and one closed; Q23 and Q24 remain disconnected; and Q25, Q26, Q31, and Q32 operate according to PFC logic. When the switching transistors of the second controller act as fast transistors, Q33 and Q34 remain off, K11 remains off, and Q35 and Q36 alternately have one on and one off. This allows the bridge arms Q31 and Q32 to form the fast transistor bridge arms of PFC. Simultaneously, the bridge arms Q23 and Q24 remain disconnected, K10 remains off, and Q21 and Q22 alternately have one open and one closed. This allows the bridge arms Q25 and Q26 to act as slow transistor bridge arms, forming a closed loop. Sufficient inductance can be provided by the two windings L31 and L32 of the second motor to prevent current discontinuity. The third and fourth bridge arms, the boost DC module, and the transformer T1 form a full-bridge DC-DC converter topology during charging, enabling high-voltage DC control to charge the battery module. In this embodiment, the switching transistor of the first controller can also act as the fast bridge arm, and the second controller can be configured as the slow bridge arm.

[0079] When in motion, K10 and K11 remain engaged, while K12 and K13 remain disengaged. Q21, Q22, Q23, Q24, Q25, Q26, Q31, Q32, Q33, Q34, Q35, and Q36 are switched on / off according to the motor's logic.

[0080] Figure 5 The operating states of each switch and the switching transistor of the bridge arm in the energy conversion circuit under the first and second states are shown in Table 4.

[0081] Table 4

[0082]

[0083] The above embodiments Figures 2 to 4The diagram shows four ways to connect the filter of the energy conversion circuit to the first motor unit and the second motor unit, which can realize the reuse of some power devices in the first motor unit and the second motor unit to improve the utilization rate of power devices.

[0084] In this embodiment, a third switch K12 and a fourth switch K13 are also provided between the charging interface and the filter of the energy conversion circuit. One end of the third switch K12 is connected to the first output terminal of the charging interface, and the other end of the first switch K12 is connected to the first input terminal of the filter. One end of the fourth switch K13 is connected to the second output terminal of the charging interface, and the other end of the fourth switch K13 is connected to the second input terminal of the filter. When the energy conversion circuit is in the first state, the third switch and the fourth switch are in the on state. When the energy conversion circuit is in the second state, the third switch and the fourth switch are in the off state.

[0085] In this embodiment, the third and fourth switches are respectively set on the two output lines of the charging interface, which can realize the circuit on / off control between the charging voltage and the battery module, thereby controlling the charging circuit to be connected or disconnected according to the state of the energy conversion circuit.

[0086] In this embodiment, the first end of the transformer is connected to the first motor unit through the fifth switch K3, and the second end of the transformer is connected to the boost DC module through the sixth switch K4. When the energy conversion circuit is in the first state, the fifth switch K3 and the sixth switch K4 are in the conducting state; when the energy conversion circuit is in the second state, the fifth switch K3 and the sixth switch K4 are in the disconnected state.

[0087] In this embodiment, the transformer also includes a third terminal and a fourth terminal. The fourth terminal of the transformer is connected to the second motor unit, and the fourth terminal and the second terminal of the transformer are respectively connected to the first output terminal and the second output terminal of the boost DC module.

[0088] In this embodiment, when the energy conversion circuit is in the first state, the fifth switch K3 and the sixth switch K4 are in the conducting state, and the high voltage received by the charging interface can be converted into the charging voltage of the battery module by the transformer.

[0089] When the energy conversion circuit is in its second state, the fifth switch K3 and the sixth switch K4 are in the open state. During vehicle operation, the circuit between the first and second controllers and the vehicle's high-voltage lines can be disconnected, at which point electrical energy is output externally through the battery module.

[0090] In this embodiment, the boost DC module is used to make the output voltage higher than the input voltage when the vehicle performs a specific function, thereby providing the vehicle with a higher voltage value.

[0091] In one example, the boost DC module is connected to the battery module through the second input terminal of the first input terminal. The first input terminal of the boost DC module is connected to the positive terminal of the battery module, and the second input terminal is connected to the negative terminal of the battery module.

[0092] In this embodiment, the first output boost DC module may include two or more boost circuits, see reference. Figure 6 The boost DC module includes two boost circuits. One boost circuit includes inductor L2, MOSFETs Q13 and Q14, and the other includes inductor L1, MOSFETs Q11 and Q12. The drain (d) of Q13 is connected to the drain (d) of Q11, and the source (s) of Q13 is connected to the drain (d) of Q14. The source (s) of Q14 is connected to the second input terminal of the boost DC module. The source (s) of MOSFET Q13 and the drain (d) of MOSFET Q14 are also connected to one end of inductor L2, and the other end of inductor L2 is connected to the first input terminal of the boost DC module. The source (s) of Q11 is connected to the drain (d) of Q14, and the source (s) of Q12 is connected to the second input terminal of the boost DC module. The source (s) of Q11 and the drain (d) of Q14 are also connected to one end of inductor L1, and the other end of inductor L1 is connected to the first input terminal of the boost DC module. A capacitor C1 is also connected in parallel between the first and second input terminals of the boost DC module.

[0093] refer to Figure 6 The drain (d) terminals of Q13 and Q11 are also connected to the first voltage output terminal Out1 of the boost DC module. The source (s) terminal of Q11 and the drain (d) terminal of Q14 are also connected to the second voltage output terminal Out2 of the boost DC module. The second voltage output terminal Out2 of the boost DC module is connected to the second terminal of the transformer T1 through the sixth switch K4. The first voltage output terminal Out1 of the boost DC module is connected to the fourth terminal of the transformer.

[0094] The energy conversion circuit provided in this embodiment includes a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface connects the first motor unit and the second motor unit. The first motor unit, the second motor unit, the boost DC module, and the battery module are connected sequentially. The voltage input terminals of both the first and second motor units are connected to the voltage output terminal of the boost DC module via transformers. The charging interface provides input voltage to the energy conversion circuit. By reusing the power devices in the first and second motor units, in the first state where the energy conversion circuit is charging the battery module, one or more bridge arms of the first and second motor units are configured as PFC modules. In the second state, both bridge arms of the first and second motor units are configured as drive modules. This simplifies the circuit structure and improves the utilization rate of the power devices in the energy conversion circuit.

[0095] Figure 7 This embodiment provides a structural block diagram of a vehicle 700, which includes the energy conversion circuit 701 provided in the above embodiment.

[0096] like Figure 1 As shown, the energy conversion circuit includes a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface connects the first motor unit and the second motor unit, and provides input voltage to the energy conversion circuit. The first motor unit, the second motor unit, the boost DC module, and the battery module are connected sequentially, and the voltage input terminals of both the first and second motor units are connected to the voltage output terminal of the boost DC module via transformers. The energy conversion circuit has a first state for charging the battery module and a second state for driving external devices through the boost DC module, the first motor unit, and the second motor unit. Both the first and second motor units include multiple bridge arms. In the first state, one or more bridge arms of the first and second motor units are configured as PFC modules. In the second state, all bridge arms of the first and second motor units are configured as drive modules. By reusing the power devices in the first and second motor units, the circuit structure can be simplified, and the utilization rate of the power devices in the energy conversion circuit can be improved.

[0097] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0098] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0099] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An energy conversion circuit, characterized in that, The energy conversion circuit includes: a charging interface, a first motor unit, a second motor unit, a boost DC module, and a battery module. The charging interface connects the first motor unit and the second motor unit, and the charging interface is used to provide input voltage to the energy conversion circuit. The first motor unit, the second motor unit, the boost DC module, and the battery module are connected in sequence, and the voltage input terminals of the first motor unit and the second motor unit are both connected to the voltage output terminal of the boost DC module through transformers. The energy conversion circuit has a first state of charging the battery module and a second state of driving external devices through the boost DC module, the first motor unit and the second motor unit. The first motor unit and the second motor unit each include multiple bridge arms. In the first state, one or more bridge arms of the first motor unit and the second motor unit are configured as PFC modules. In the second state, the bridge arms of the first motor unit and the second motor unit are configured as drive modules.

2. The energy conversion circuit according to claim 1, characterized in that, The energy conversion circuit also includes a filter, the charging interface is connected to the first input terminal and the second input terminal of the filter, the first output terminal of the filter is connected to the first motor unit, and the second output terminal of the filter is connected to the second motor unit; The first motor unit includes a first controller and a first motor, and the second motor unit includes a second controller and a second motor. Both the first controller and the second controller are provided with a three-phase bridge arm, and both the first motor and the second motor are provided with a three-phase winding. One end of each winding of the first motor is connected to each arm of the first controller in a corresponding manner, and the other end of each winding of the first motor is connected to each other as the first connection point; One end of each winding of the second motor is connected to each bridge arm of the second controller in a corresponding manner, and the other end of each winding of the second motor is connected to each other as a second connection point; Any arm of the first controller is connected to the voltage input terminal of the first motor unit, and any arm of the second controller is connected to the voltage input terminal of the second motor unit.

3. The energy conversion circuit according to claim 2, characterized in that, The first controller's three-phase bridge arms include a first bridge arm, a second bridge arm, and a third bridge arm. The third bridge arm is connected to the voltage input terminal of the first motor unit. The second controller's three-phase bridge arms include a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm. The fourth bridge arm is connected to the voltage input terminal of the second motor unit. Furthermore, a first switch is provided between the third bridge arm and the three-phase winding connected to the third bridge arm, and a second switch is provided between the fourth bridge arm and the three-phase winding connected to the fourth bridge arm. When the energy conversion circuit is in the first state, the first switch and the second switch are in the open state. When the energy conversion circuit is in the second state, the first switch and the second switch are in the on state.

4. The energy conversion circuit according to claim 3, characterized in that, The first output terminal of the filter is connected to the first connection point, and the second output terminal of the filter is connected to the second connection point; When the energy conversion circuit is in the first state, the first and second bridge arms of the first controller, and the fifth and sixth bridge arms of the second controller are configured as PFC modules.

5. The energy conversion circuit according to claim 3, characterized in that, The first output terminal of the filter is connected to the first bridge arm, and the second output terminal of the filter is connected to the fifth bridge arm; When the energy conversion circuit is in the first state, the first bridge arm of the first controller and the sixth bridge arm of the second controller are configured as PFC modules.

6. The energy conversion circuit according to claim 4, characterized in that, A first inductor is also provided between the second output terminal of the filter and the second connection point.

7. The energy conversion circuit according to claim 5, characterized in that, A second inductor is also provided between the second output terminal of the filter and the fifth bridge arm.

8. The energy conversion circuit according to claim 3, 4, 5, 6, or 7, characterized in that, A third switch and a fourth switch are also provided between the charging interface and the filter. One end of the third switch is connected to the first output terminal of the charging interface, and the other end of the first switch is connected to the first input terminal of the filter. One end of the fourth switch is connected to the second output terminal of the charging interface, and the other end of the fourth switch is connected to the second input terminal of the filter; When the energy conversion circuit is in the first state, the third switch and the fourth switch are in the on state; When the energy conversion circuit is in the second state, the third switch and the fourth switch are in the off state.

9. The energy conversion circuit according to claim 1, characterized in that, The first terminal of the transformer is connected to the first motor unit via a fifth switch, and the second terminal of the transformer is connected to the boost DC module via a sixth switch. When the energy conversion circuit is in the first state, the fifth switch and the sixth switch are in the on state; When the energy conversion circuit is in the second state, the fifth switch and the sixth switch are in the off state.

10. A vehicle, characterized in that, Includes the energy conversion circuit according to any one of claims 1-9.

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