Charging and discharging circuit and vehicle-mounted charger

Abstract

The embodiment of the utility model provides a charging and discharging circuit and a vehicle-mounted charger. The charging and discharging circuit comprises a filtering module, a pre-charging module, a rectifying module, a voltage-sharing module and a direct-current conversion module, the charging and discharging circuit is used for being compatible with national standard single-phase charging, national standard single-phase discharging, national standard three-phase charging, national standard three-phase discharging, American standard single-phase charging, American standard two-phase charging, American standard three-phase charging, American standard single-phase discharging, American standard two-phase discharging, American standard split two-phase discharging and American standard three-phase discharging. The power grid compatibility of the charging and discharging circuit can be improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic circuits, and particularly relates to a charge and discharge circuit and an on-vehicle charger. Background Art

[0002] With the rapid development of electric vehicles, the on-vehicle charger, as the carrier for charging the battery of an electric vehicle and also as the interface for the battery to discharge externally, plays a crucial role. Currently, the on-vehicle charger can only be compatible with the national standard, and its grid compatibility is relatively low. Utility Model Content

[0003] An embodiment of this application provides a charge and discharge circuit and an on-vehicle charger, which can improve the grid compatibility of the on-vehicle charger.

[0004] A first aspect of an embodiment of this application provides a charge and discharge circuit, including a filtering module, a pre-charging module, a rectifying module, a voltage equalizing module, and a DC conversion module;

[0005] The first end of the filtering module is used to connect to the first-phase live wire, the second end of the filtering module is used to connect to the second-phase live wire, the third end of the filtering module is used to connect to the third-phase live wire, and the fourth end of the filtering module is used to connect to the neutral wire; the fifth end of the filtering module is connected to the first end of the pre-charging module, the sixth end of the filtering module is connected to the second end of the pre-charging module, the seventh end of the filtering module is connected to the third end of the pre-charging module, the eighth end of the filtering module is connected to the fourth end of the rectifying module, the ninth end of the filtering module is connected to the second end of the voltage equalizing module, the fourth end of the pre-charging module is connected to the first end of the rectifying module, the fifth end of the pre-charging module is connected to the second end of the rectifying module, and the sixth end of the pre-charging module is connected to the third end of the rectifying module; the fifth end of the rectifying module is connected to the first end of the voltage equalizing module and the first end of the DC conversion module, the sixth end of the rectifying module is connected to the third end of the voltage equalizing module and the second end of the DC conversion module, the third end of the DC conversion module is connected to the positive pole of the DC port, and the fourth end of the DC conversion module is connected to the negative pole of the DC port;

[0006] The charge and discharge circuit is used to be compatible with single-phase charging of the national standard, single-phase discharging of the national standard, three-phase charging of the national standard, three-phase discharging of the national standard, single-phase charging of the US standard, two-phase charging of the US standard, three-phase charging of the US standard, single-phase discharging of the US standard, two-phase discharging of the US standard, split two-phase discharging of the US standard, and three-phase discharging of the US standard.

[0007] Optionally, the filtering module includes a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a first switch, a second switch, a third switch, and a fourth switch; a first end of the first capacitor is connected to a first end of the filtering module and a first end of the first inductor, a first end of the second capacitor is connected to a second end of the filtering module and a first end of the second inductor, a first end of the third capacitor is connected to a third end of the filtering module and a first end of the third inductor, a second end of the first capacitor is connected to a second end of the second capacitor, a second end of the third capacitor, and a first end of the fourth switch, a second end of the fourth switch is connected to a second end of the voltage equalizing module, a third end of the fourth switch is connected to a first end of the fourth inductor, a second end of the fourth inductor is connected to a third end of the third switch, a second end of the third switch is connected to a second end of the second inductor and a third end of the first switch, a first end of the third switch is connected to a fourth end of the rectifying module, a second end of the first inductor is connected to a second end of the first switch, a second end of the second switch, and a first end of the charge and discharge circuit, a first end of the first switch is connected to a second end of the charge and discharge circuit, a second end of the third inductor is connected to a third end of the second switch, and a first end of the second switch is connected to a third end of the charge and discharge circuit.

[0008] Optionally, the pre-charging module includes a first resistor, a second resistor, a third resistor, a fifth switch, a sixth switch, and a seventh switch; a first end of the first resistor is connected to a first end of the fifth switch and a first end of the pre-charging module, a second end of the first resistor is connected to a second end of the fifth switch and a fourth end of the pre-charging module; a first end of the second resistor is connected to a first end of the sixth switch and a second end of the pre-charging module, a second end of the second resistor is connected to a second end of the sixth switch and a fifth end of the pre-charging module; a first end of the third resistor is connected to a first end of the sixth switch and a third end of the pre-charging module, a second end of the third resistor is connected to a second end of the sixth switch and a sixth end of the pre-charging module.

[0009] Optionally, the rectification module includes a fifth inductor, a sixth inductor, a seventh inductor, an eighth inductor, a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor; a first end of the fifth inductor is connected to a fourth end of the pre-charging module, and a second end of the fifth inductor is connected to a second end of the first switching transistor and a first end of the second switching transistor; a first end of the sixth inductor is connected to a fifth end of the pre-charging module, and a second end of the sixth inductor is connected to a second end of the third switching transistor and a first end of the fourth switching transistor; a first end of the seventh inductor is connected to a sixth end of the pre-charging module, and a second end of the seventh inductor is connected to a second end of the fifth switching transistor and a first end of the sixth switching transistor; a first end of the eighth inductor is connected to an eighth end of the filtering module, and a second end of the eighth inductor is connected to a second end of the seventh switching transistor and a first end of the eighth switching transistor; a first end of the first switching transistor is connected to a first end of the third switching transistor, a first end of the fifth switching transistor, a first end of the seventh switching transistor, and a first end of the voltage equalizing module, and a second end of the second switching transistor is connected to a second end of the fourth switching transistor, a second end of the sixth switching transistor, a second end of the eighth switching transistor, and a third end of the voltage equalizing module.

[0010] Optionally, the voltage equalizing module includes a fourth capacitor, a fifth capacitor, a ninth inductor, a ninth switching transistor, and a tenth switching transistor; a first end of the fourth capacitor is connected to a first end of the ninth switching transistor and a first end of the voltage equalizing module, a second end of the fifth capacitor is connected to a second end of the tenth switching transistor and a third end of the voltage equalizing module, a second end of the fourth capacitor is connected to a first end of the fifth capacitor, a first end of the ninth inductor, and a second end of the voltage equalizing module, and a second end of the ninth inductor is connected to a second end of the ninth switching transistor and a first end of the tenth switching transistor.

[0011] Optionally, when the charge and discharge circuit is in the national standard single-phase charging or the national standard single-phase discharging state, a first end of the filtering module is connected to a first-phase live wire, a fourth end of the filtering module is connected to a neutral wire, a first end of the first switch is connected to a second end of the first switch, a first end of the second switch is connected to a third end of the second switch, a first end of the third switch is connected to a third end of the third switch, and a first end of the fourth switch is connected to a third end of the fourth switch;

[0012] When the charge and discharge circuit is in the national standard three-phase charging or the national standard three-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the third end of the filtering module is connected to the third-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch.

[0013] Optionally, when the charge and discharge circuit is in the US standard single-phase charging state and at the first charging power, the first end of the filtering module is connected to the first-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch;

[0014] When the charge and discharge circuit is in the US standard single-phase charging state and at the second charging power, or when the charge and discharge circuit is in the US standard single-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the second end of the first switch, the first end of the second switch is connected to the second end of the second switch, the first end of the third switch is connected to the third end of the third switch, the first end of the fourth switch is connected to the third end of the fourth switch, and the first charging power is not equal to the second charging power;

[0015] When the charge and discharge circuit is in the US standard two-phase charging or the US standard two-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the second end of the second switch, the first end of the third switch is connected to the second end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch;

[0016] When the charging and discharging circuit is in the case of US standard three-phase charging or US standard three-phase discharging, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the third end of the filtering module is connected to the third-phase live wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the second end of the second switch, the first end of the third switch is connected to the second end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch.

[0017] Optionally, when the charging and discharging circuit is in the case of US standard split-phase discharging, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the second end of the fourth switch.

[0018] Optionally, when the charging and discharging circuit is in the case of US standard split-phase discharging, the voltage equalizing module is used to control the voltages across the two ends of the fourth capacitor and the fifth capacitor to be equal.

[0019] A second aspect of the embodiments of the present application provides an on-vehicle charger, including the charging and discharging circuit according to any one of the first aspects of the embodiments of the present application.

[0020] The charging and discharging circuit of the embodiments of the present application includes a filtering module, a pre-charging module, a rectifying module, a voltage equalizing module and a DC conversion module; the charging and discharging circuit can be compatible with national standard single-phase charging, national standard single-phase discharging, national standard three-phase charging, national standard three-phase discharging, US standard single-phase charging, US standard two-phase charging, US standard three-phase charging, US standard single-phase discharging, US standard two-phase discharging, US standard split-phase discharging and US standard three-phase discharging, which can improve the grid compatibility of the charging and discharging circuit, and further improve the grid compatibility of the on-vehicle charger. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0022] Figure 1 It is a schematic structural diagram of a charging and discharging circuit provided by an embodiment of the present application;

[0023] Figure 2 It is a schematic structural diagram of a charge and discharge circuit provided by an embodiment of the present application;

[0024] Figure 3 It is a simulation schematic diagram of the voltages at both ends of a fourth capacitor and the voltages at both ends of a fifth capacitor provided by an embodiment of the present application;

[0025] Figure 4 It is a simulation schematic diagram of a split two-phase voltage provided by an embodiment of the present application;

[0026] Figure 5 It is a schematic structural diagram of an on-vehicle charger provided by an embodiment of the present application. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0028] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, products or devices.

[0029] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0030] Please refer to Figure 1 , Figure 1 It is a schematic structural diagram of a charge and discharge circuit provided by an embodiment of the present application. As Figure 1 shown, the charge and discharge circuit 100 includes a filtering module 10, a pre-charging module 20, a rectifying module 30, a voltage equalizing module 40, and a DC conversion module 50;

[0031] The first end of the filtering module 10 is used to connect to the first-phase live wire L1, the second end of the filtering module 10 is used to connect to the second-phase live wire L2, the third end of the filtering module 10 is used to connect to the third-phase live wire L3, and the fourth end of the filtering module 10 is used to connect to the neutral wire N; the fifth end of the filtering module 10 is connected to the first end of the pre-charging module 20, the sixth end of the filtering module 10 is connected to the second end of the pre-charging module 20, the seventh end of the filtering module 10 is connected to the third end of the pre-charging module 20, the eighth end of the filtering module 10 is connected to the fourth end of the rectifying module 30, the ninth end of the filtering module 10 is connected to the second end of the voltage equalizing module 40, the fourth end of the pre-charging module 20 is connected to the first end of the rectifying module 30, the fifth end of the pre-charging module 20 is connected to the second end of the rectifying module 30, and the sixth end of the pre-charging module 20 is connected to the third end of the rectifying module 30; the fifth end of the rectifying module 30 is connected to the first end of the voltage equalizing module 40 and the first end of the DC conversion module 50, the sixth end of the rectifying module 30 is connected to the third end of the voltage equalizing module 40 and the second end of the DC conversion module 50, the third end of the DC conversion module 50 is connected to the positive pole V+ of the DC port, and the fourth end of the DC conversion module 50 is connected to the negative pole V- of the DC port;

[0032] The charging and discharging circuit 100 is used to be compatible with national standard single-phase charging, national standard single-phase discharging, national standard three-phase charging, national standard three-phase discharging, US standard single-phase charging, US standard two-phase charging, US standard three-phase charging, US standard single-phase discharging, US standard two-phase discharging, US standard split two-phase discharging, and US standard three-phase discharging.

[0033] The national standard refers to the Chinese standard. The US standard refers to the American standard.

[0034] The charging and discharging circuit 100 of the embodiment of the present application includes a filtering module 10, a pre-charging module 20, a rectifying module 30, a voltage equalizing module 40, and a DC conversion module 50; the filtering module 10 can be used for electromagnetic interference (EMI) filtering. The pre-charging module 20 is used to pre-charge the capacitors in the voltage equalizing module 40. The rectifying module 30 is used to rectify the AC voltage into a DC voltage. The DC conversion module 50 can be used to convert one DC voltage into another DC voltage. Exemplarily, the DC conversion module 50 can be a direct current / direct current converter (DC / DC) module.

[0035] It should be noted that since the charge and discharge circuit 100 can be compatible with the charge and discharge of different power grids. When the power grid is single-phase power (for example, a household power grid), one of the first end, the second end, and the third end of the filtering module 10 is connected to the live wire, and the fourth end of the filtering module 10 is connected to the neutral wire N. Exemplarily, if the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end and the third end of the filtering module 10 are not connected, and the fourth end of the filtering module 10 is connected to the neutral wire N, the charge and discharge circuit 100 can operate in single-phase charging (charging the battery through the first-phase live wire L1) or single-phase discharging (the battery discharging to the first-phase live wire L1).

[0036] When the power grid is three-phase power (for example, an industrial power grid or a commercial power grid), the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the third end of the filtering module 10 is connected to the third-phase live wire L3, and the fourth end of the filtering module 10 can be connected to the neutral wire N or not connected to the neutral wire N. Exemplarily, if the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the third end of the filtering module 10 is connected to the third-phase live wire L3, and the fourth end of the filtering module 10 is connected to the neutral wire N, the charge and discharge circuit 100 can operate in three-phase charging (charging the battery through the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3) or three-phase discharging (the battery discharging to the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3).

[0037] In the embodiments of the present application, the charge and discharge circuit 100 can be compatible with national standard single-phase charging, national standard single-phase discharging, national standard three-phase charging, national standard three-phase discharging, US standard single-phase charging, US standard two-phase charging, US standard three-phase charging, US standard single-phase discharging, US standard two-phase discharging, US standard split two-phase discharging, and US standard three-phase discharging, which can improve the grid compatibility of the charge and discharge circuit 100, and further improve the grid compatibility of the on-vehicle charger.

[0038] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a charge and discharge circuit provided by the embodiments of the present application. As Figure 2As shown, the filtering module 10 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L11, a second inductor L12, a third inductor L13, a fourth inductor L14, a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4; a first end of the first capacitor C1 is connected to a first end of the filtering module 10 and a first end of the first inductor L11, a first end of the second capacitor C2 is connected to a second end of the filtering module 10 and a first end of the second inductor L12, a first end of the third capacitor C3 is connected to a third end of the filtering module 10 and a first end of the third inductor L13, a second end of the first capacitor C1 is connected to a second end of the second capacitor C2, a second end of the third capacitor C3, and a first end of the fourth switch K4 (such as port 1 of K4 shown in Figure 2 ), a second end of the fourth switch K4 (such as port 2 of K4 shown in Figure 2 ) is connected to a second end of the voltage equalizing module 40, a third end of the fourth switch K4 (such as port 3 of K4 shown in Figure 2 ) is connected to a first end of the fourth inductor L14, a second end of the fourth inductor L14 is connected to a third end of the third switch K3 (such as port 3 of K3 shown in Figure 2 ), a second end of the third switch K3 (such as port 2 of K3 shown in Figure 2 ) is connected to a second end of the second inductor L12 and a third end of the first switch K1 (such as port 3 of K1 shown in Figure 2 ), a first end of the third switch K3 (such as port 1 of K3 shown in Figure 2 ) is connected to a fourth end of the rectifying module 30, a second end of the first inductor L11 is connected to a second end of the first switch K1 (such as port 2 of K1 shown in Figure 2 ), a second end of the second switch K2 (such as port 2 of K2 shown in Figure 2 ), and a first end of the pre-charging module 20, a first end of the first switch K1 (such as port 1 of K1 shown in Figure 2 ) is connected to a second end of the pre-charging module 20, a second end of the third inductor L13 is connected to a third end of the second switch K2 (such as port 3 of K2 shown in Figure 2 ), and a first end of the second switch K2 (such as port 1 of K2 shown in Figure 2 ) is connected to a third end of the pre-charging module 20.

[0039] In the embodiment of the present application, the first capacitor C1, the second capacitor C2, and the third capacitor C3 can play an EMI filtering role to prevent high-frequency interference from leaking from the first-phase live wire L1, the second-phase live wire L2, and the third-phase live wire L3 to interfere with other devices. The first inductor L11, the second inductor L12, the third inductor L13, and the fourth inductor L14 can be common-mode inductors and can play an EMI filtering role.

[0040] The first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are all single-pole double-throw switches (SinglePole Double Throw, SPDT). By controlling the connection states of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4, charging and discharging are compatible with different power grids.

[0041] Optionally, as Figure 2 shown, the pre-charge module 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a fifth switch S1, a sixth switch S2, and a seventh switch S3; the first end of the first resistor R1 is connected to the first end of the fifth switch S1 and the first end of the pre-charge module 20, and the second end of the first resistor R1 is connected to the second end of the fifth switch S1 and the fourth end of the pre-charge module 20; the first end of the second resistor R2 is connected to the first end of the sixth switch S2 and the second end of the pre-charge module 20, and the second end of the second resistor R2 is connected to the second end of the sixth switch S2 and the fifth end of the pre-charge module 20; the first end of the third resistor R3 is connected to the first end of the seventh switch S3 and the third end of the pre-charge module 20, and the second end of the third resistor R3 is connected to the second end of the seventh switch S3 and the sixth end of the pre-charge module 20.

[0042] In the embodiment of the present application, the pre-charge module 20 is used to pre-charge the capacitors in the voltage equalization module 40. Before the charging and discharging circuit 100 starts to work (charging or discharging), the fifth switch S1, the sixth switch S2, and the seventh switch S3 can be disconnected, and the capacitors in the voltage equalization module 40 are pre-charged through the first resistor R1, the second resistor R2, and the third resistor R3. The first resistor R1, the second resistor R2, and the third resistor R3 can limit the pre-charge current. The fifth switch S1, the sixth switch S2, and the seventh switch S3 can be relays.

[0043] Optionally, as Figure 2As shown, the rectification module 30 includes a fifth inductor L15, a sixth inductor L16, a seventh inductor L17, an eighth inductor L18, a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, a fourth switching transistor Q4, a fifth switching transistor Q5, a sixth switching transistor Q6, a seventh switching transistor Q7, and an eighth switching transistor Q8. The first end of the fifth inductor L15 is connected to the fourth end of the pre-charging module 20, and the second end of the fifth inductor L15 is connected to the second end of the first switching transistor Q1 and the first end of the second switching transistor Q2. The first end of the sixth inductor L16 is connected to the fifth end of the pre-charging module 20, and the second end of the sixth inductor L16 is connected to the second end of the third switching transistor Q3 and the first end of the fourth switching transistor Q4. The first end of the seventh inductor L17 is connected to the sixth end of the pre-charging module 20, and the second end of the seventh inductor L17 is connected to the second end of the fifth switching transistor Q5 and the first end of the sixth switching transistor Q6. The first end of the eighth inductor L18 is connected to the eighth end of the filtering module 10, and the second end of the eighth inductor L18 is connected to the second end of the seventh switching transistor Q7 and the first end of the eighth switching transistor Q8. The first end of the first switching transistor Q1 is connected to the first ends of the third switching transistor Q3, the fifth switching transistor Q5, the seventh switching transistor Q7, and the first end of the voltage equalizing module 40. The second end of the second switching transistor Q2 is connected to the second ends of the fourth switching transistor Q4, the sixth switching transistor Q6, the eighth switching transistor Q8, and the third end of the voltage equalizing module 40.

[0044] In the embodiment of the present application, the rectification module 30 may be a Power Factor Corrector (PFC) circuit. The fifth inductor L15, the sixth inductor L16, the seventh inductor L17, and the eighth inductor L18 may be PFC inductors, which can play a role in boosting voltage. The first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the fifth switching transistor Q5, the sixth switching transistor Q6, the seventh switching transistor Q7, and the eighth switching transistor Q8 may be rectification switching transistors, which can play a role in PFC rectification. The first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the fifth switching transistor Q5, the sixth switching transistor Q6, the seventh switching transistor Q7, and the eighth switching transistor Q8 may be Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) or Insulate-Gate Bipolar Transistors (IGBTs).

[0045] Optionally, as Figure 2As shown, the voltage equalizing module 40 includes a fourth capacitor C4, a fifth capacitor C5, a ninth inductor L19, a ninth switching transistor Q9, and a tenth switching transistor Q10; a first end of the fourth capacitor C4 is connected to a first end of the ninth switching transistor Q9 and a first end of the voltage equalizing module 40, a second end of the fifth capacitor C5 is connected to a second end of the tenth switching transistor Q10 and a third end of the voltage equalizing module 40, a second end of the fourth capacitor C4 is connected to a first end of the fifth capacitor C5, a first end of the ninth inductor L19, and a second end of the voltage equalizing module 40, and a second end of the ninth inductor L19 is connected to a second end of the ninth switching transistor Q9 and a first end of the tenth switching transistor Q10.

[0046] In the embodiment of the present application, the voltage equalizing module 40 can balance the voltages of the fourth capacitor C4 and the fifth capacitor C5, make the voltages of the fourth capacitor C4 and the fifth capacitor C5 equal, so that the charge and discharge circuit 100 can be used for split-phase discharging in accordance with the US standard.

[0047] Optionally, as Figure 2 shown, when the charge and discharge circuit 100 is in the state of single-phase charging or single-phase discharging in accordance with the national standard, a first end of the filtering module 10 is connected to a first-phase live wire L1, a fourth end of the filtering module 10 is connected to a neutral wire N, and at this time, a second end and a third end of the filtering module 10 are disconnected from the live wire. A first end of the first switch K1 is connected to a second end of the first switch K1, a first end of the second switch K2 is connected to a third end of the second switch K2, a first end of the third switch K3 is connected to a third end of the third switch K3, and a first end of the fourth switch K4 is connected to a third end of the fourth switch K4;

[0048] When the charge and discharge circuit 100 is in the state of three-phase charging or three-phase discharging in accordance with the national standard, a first end of the filtering module 10 is connected to a first-phase live wire L1, a second end of the filtering module 10 is connected to a second-phase live wire L2, a third end of the filtering module 10 is connected to a third-phase live wire L3, a fourth end of the filtering module 10 is connected to a neutral wire N, a first end of the first switch K1 is connected to a third end of the first switch K1, a first end of the second switch K2 is connected to a third end of the second switch K2, a first end of the third switch K3 is connected to a third end of the third switch K3, and a first end of the fourth switch K4 is connected to a third end of the fourth switch K4.

[0049] In the embodiment of the present application, when the charging and discharging circuit 100 is in national standard single-phase charging or national standard single-phase discharging, the first end of the filtering module 10 is connected to the first-phase live wire L1, the fourth end of the filtering module 10 is connected to the neutral wire N, the first end of the first switch K1 is connected to the second end of the first switch K1 (i.e., the first switch K1 is closed), the first end of the second switch K2 is connected to the third end of the second switch K2 (i.e., the second switch K2 does not actuate), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not actuate), and the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not actuate). Exemplarily, the rated power or the maximum power of the charging and discharging circuit 100 when it is in national standard single-phase charging or national standard single-phase discharging is 7.2 kilowatts (KW), and the rated voltage of the charging and discharging circuit 100 when it is in national standard single-phase charging or national standard single-phase discharging is 220 volts (V).

[0050] When the charging and discharging circuit 100 is in national standard three-phase charging or national standard three-phase discharging, the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the third end of the filtering module 10 is connected to the third-phase live wire L3, the fourth end of the filtering module 10 is connected to the neutral wire N, the first end of the first switch K1 is connected to the third end of the first switch K1 (i.e., the first switch K1 does not actuate), the first end of the second switch K2 is connected to the third end of the second switch K2 (i.e., the second switch K2 does not actuate), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not actuate), and the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not actuate). Exemplarily, the rated power or the maximum power of the charging and discharging circuit 100 when it is in national standard three-phase charging or national standard three-phase discharging is 11 KW, and the rated voltage of the charging and discharging circuit 100 when it is in national standard three-phase charging or national standard three-phase discharging is 220 V.

[0051] Optionally, as Figure 2 shown, when the charging and discharging circuit 100 is in US standard single-phase charging and at the first charging power, the first end of the filtering module 10 is connected to the first-phase live wire L1, the fourth end of the filtering module 10 is connected to the neutral wire N, the first end of the first switch K1 is connected to the third end of the first switch K1 (i.e., the first switch K1 does not actuate), the first end of the second switch K2 is connected to the third end of the second switch K2 (i.e., the second switch K2 does not actuate), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not actuate), and the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not actuate);

[0052] When the charging and discharging circuit 100 is in the US standard single-phase charging state and at the second charging power, or when the charging and discharging circuit 100 is in the US standard single-phase discharging state, the first end of the filtering module 10 is connected to the first-phase live wire L1, the fourth end of the filtering module 10 is connected to the neutral wire N, the first end of the first switch K1 is connected to the second end of the first switch K1 (i.e., the first switch K1 is closed), the first end of the second switch K2 is connected to the second end of the second switch K2 (i.e., the second switch K2 is closed), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not act), the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not act), and the first charging power is not equal to the second charging power;

[0053] When the charging and discharging circuit 100 is in the US standard two-phase charging or the US standard two-phase discharging state, the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the first end of the first switch K1 is connected to the third end of the first switch K1 (i.e., the first switch K1 does not act), the first end of the second switch K2 is connected to the second end of the second switch K2 (i.e., the second switch K2 is closed), the first end of the third switch K3 is connected to the second end of the third switch K3 (i.e., the third switch K3 is closed), the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not act);

[0054] When the charging and discharging circuit 100 is in the US standard three-phase charging or the US standard three-phase discharging state, the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the third end of the filtering module 10 is connected to the third-phase live wire L3, the first end of the first switch K1 is connected to the third end of the first switch K1 (i.e., the first switch K1 does not act), the first end of the second switch K2 is connected to the third end of the second switch K2 (i.e., the second switch K2 does not act), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not act), the first end of the fourth switch K4 is connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 does not act).

[0055] In the embodiment of the present application, when the charge and discharge circuit 100 is in single-phase charging according to the US standard, it can be at the first charging power or the second charging power. Exemplarily, the first charging power can be 1.92 KW, and the second charging power can be 11 KW. When the charge and discharge circuit 100 is in single-phase charging according to the US standard and at the first charging power of 1.92 KW, the rated voltage of the charge and discharge circuit 100 is 120V. When the charge and discharge circuit 100 is in single-phase charging according to the US standard and at the second charging power of 11 KW, the rated voltage of the charge and discharge circuit 100 is 240V.

[0056] The first charging power and the second charging power can be the rated power or the maximum power during charging.

[0057] Exemplarily, the rated power or the maximum power of the charge and discharge circuit 100 during single-phase discharging according to the US standard is 11 KW, and the rated voltage of the charge and discharge circuit 100 during single-phase discharging according to the US standard is 240V.

[0058] Exemplarily, the rated power or the maximum power of the charge and discharge circuit 100 during two-phase charging or two-phase discharging according to the US standard is 11 KW, and the rated voltage of the charge and discharge circuit 100 during two-phase charging or two-phase discharging according to the US standard is 240V.

[0059] Exemplarily, the rated power or the maximum power of the charge and discharge circuit 100 during three-phase charging or three-phase discharging according to the US standard is 11 KW, and the rated voltage of the charge and discharge circuit 100 during three-phase charging or three-phase discharging according to the US standard is 230V.

[0060] Optionally, as Figure 2 shown, in the case where the charge and discharge circuit 100 is in split-phase two-phase discharging according to the US standard, the first end of the filtering module 10 is connected to the first-phase live wire L1, the second end of the filtering module 10 is connected to the second-phase live wire L2, the fourth end of the filtering module 10 is connected to the neutral wire N, the first end of the first switch K1 is connected to the third end of the first switch K1 (i.e., the first switch K1 does not operate), the first end of the second switch K2 is connected to the third end of the second switch K2 (i.e., the second switch K2 does not operate), the first end of the third switch K3 is connected to the third end of the third switch K3 (i.e., the third switch K3 does not operate), and the first end of the fourth switch K4 is connected to the second end of the fourth switch K4 (i.e., the fourth switch K4 is closed).

[0061] Exemplarily, the rated power or the maximum power of the charge and discharge circuit 100 during split-phase two-phase discharging according to the US standard is 1.92 KW, and the rated voltage of the charge and discharge circuit 100 during split-phase two-phase discharging according to the US standard is 120V.

[0062] Optionally, as Figure 2As shown, when the charging and discharging circuit 100 is in the US standard split-phase two-phase discharge, the voltage equalizing module 40 is used to control the voltages across the fourth capacitor C4 and the fifth capacitor C5 to be equal.

[0063] Among them, the voltage equalizing module 40 is mainly used for the US standard split-phase two-phase discharge. The voltage equalizing module 40 can be used to balance the voltages across the fourth capacitor C4 and the fifth capacitor C5. Please refer to Figure 3 , Figure 3 which is a simulation schematic diagram of the voltages across the fourth capacitor and the fifth capacitor provided by an embodiment of the present application. As Figure 3 shown, VC4 represents the voltage across the fourth capacitor C4, and VC5 represents the voltage across the fifth capacitor C5. In the initial state, there is a voltage difference between VC4 and VC5. After passing through the voltage equalizing module 40, VC4 and VC tend to balance. Please refer to Figure 4 , Figure 4 which is a simulation schematic diagram of split-phase two-phase voltage provided by an embodiment of the present application. As Figure 4 shown, L1-N (the thick black line as shown in Figure 4 ) and L2-N (the thin black line as shown in Figure 4 ) are respectively split-phase two-phase voltages, with a phase difference of 180°. L1-L2 is the voltage difference between the two phases. L1-N is the voltage between the first phase live wire L1 and the neutral wire N, and L2-N is the voltage between the first phase live wire L2 and the neutral wire N. The charging and discharging circuit 100 of the embodiment of the present application can be compatible with the charging and discharging requirements of the national standard and the US standard, greatly expanding the charging and discharging range of the on-vehicle charger, and thus expanding the charging and discharging range of electric vehicles.

[0064] Please refer to Figure 5 , Figure 5 which is a structural schematic diagram of an on-vehicle charger provided by an embodiment of the present application. As Figure 5 shown, the on-vehicle charger 200 may include Figure 1 or Figure 2 the charging and discharging circuit 100 as shown.

[0065] An embodiment of the present application also provides an electric vehicle, which may include Figure 5 the on-vehicle charger as shown.

[0066] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0067] In several embodiments provided by the present application, it should be understood that the disclosed charge and discharge circuit can be implemented in other ways. For example, the charge and discharge circuit embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A charge and discharge circuit, characterized in that, It includes a filtering module, a pre-charging module, a rectifying module, a voltage equalizing module, and a DC conversion module; The first end of the filtering module is used to connect to the first-phase live wire, the second end of the filtering module is used to connect to the second-phase live wire, the third end of the filtering module is used to connect to the third-phase live wire, and the fourth end of the filtering module is used to connect to the neutral wire; the fifth end of the filtering module is connected to the first end of the pre-charging module, the sixth end of the filtering module is connected to the second end of the pre-charging module, the seventh end of the filtering module is connected to the third end of the pre-charging module, the eighth end of the filtering module is connected to the fourth end of the rectifying module, the ninth end of the filtering module is connected to the second end of the voltage equalizing module, the fourth end of the pre-charging module is connected to the first end of the rectifying module, the fifth end of the pre-charging module is connected to the second end of the rectifying module, and the sixth end of the pre-charging module is connected to the third end of the rectifying module; the fifth end of the rectifying module is connected to the first end of the voltage equalizing module and the first end of the DC conversion module, the sixth end of the rectifying module is connected to the third end of the voltage equalizing module and the second end of the DC conversion module, the third end of the DC conversion module is connected to the positive pole of the DC port, and the fourth end of the DC conversion module is connected to the negative pole of the DC port; The charge and discharge circuit is used to be compatible with national standard single-phase charging, national standard single-phase discharging, national standard three-phase charging, national standard three-phase discharging, US standard single-phase charging, US standard two-phase charging, US standard three-phase charging, US standard single-phase discharging, US standard two-phase discharging, US standard split two-phase discharging, and US standard three-phase discharging.

2. The charge and discharge circuit according to claim 1, characterized in that, The filtering module includes a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a first switch, a second switch, a third switch, and a fourth switch; the first end of the first capacitor is connected to the first end of the filtering module and the first end of the first inductor, the first end of the second capacitor is connected to the second end of the filtering module and the first end of the second inductor, the first end of the third capacitor is connected to the third end of the filtering module and the first end of the third inductor, the second end of the first capacitor is connected to the second end of the second capacitor, the second end of the third capacitor, and the first end of the fourth switch, the second end of the fourth switch is connected to the second end of the voltage equalizing module, the third end of the fourth switch is connected to the first end of the fourth inductor, the second end of the fourth inductor is connected to the third end of the third switch, the second end of the third switch is connected to the second end of the second inductor and the third end of the first switch, the first end of the third switch is connected to the fourth end of the rectifying module, the second end of the first inductor is connected to the second end of the first switch, the second end of the second switch, and the first end of the pre-charging module, the first end of the first switch is connected to the second end of the pre-charging module, the second end of the third inductor is connected to the third end of the second switch, and the first end of the second switch is connected to the third end of the pre-charging module.

3. The charge and discharge circuit according to claim 1, wherein The pre-charging module includes a first resistor, a second resistor, a third resistor, a fifth switch, a sixth switch, and a seventh switch; a first end of the first resistor is connected to a first end of the fifth switch and a first end of the pre-charging module, and a second end of the first resistor is connected to a second end of the fifth switch and a fourth end of the pre-charging module; a first end of the second resistor is connected to a first end of the sixth switch and a second end of the pre-charging module, and a second end of the second resistor is connected to a second end of the sixth switch and a fifth end of the pre-charging module; a first end of the third resistor is connected to a first end of the seventh switch and a third end of the pre-charging module, and a second end of the third resistor is connected to a second end of the seventh switch and a sixth end of the pre-charging module.

4. The charge and discharge circuit according to claim 1, wherein The rectifying module includes a fifth inductor, a sixth inductor, a seventh inductor, an eighth inductor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, and an eighth switching tube; a first end of the fifth inductor is connected to a fourth end of the pre-charging module, and a second end of the fifth inductor is connected to a second end of the first switching tube and a first end of the second switching tube; a first end of the sixth inductor is connected to a fifth end of the pre-charging module, and a second end of the sixth inductor is connected to a second end of the third switching tube and a first end of the fourth switching tube; a first end of the seventh inductor is connected to a sixth end of the pre-charging module, and a second end of the seventh inductor is connected to a second end of the fifth switching tube and a first end of the sixth switching tube; a first end of the eighth inductor is connected to an eighth end of the filtering module, and a second end of the eighth inductor is connected to a second end of the seventh switching tube and a first end of the eighth switching tube; a first end of the first switching tube is connected to a first end of the third switching tube, a first end of the fifth switching tube, a first end of the seventh switching tube, and a first end of the voltage equalizing module, and a second end of the second switching tube is connected to a second end of the fourth switching tube, a second end of the sixth switching tube, a second end of the eighth switching tube, and a third end of the voltage equalizing module.

5. The charge and discharge circuit according to claim 2, wherein The voltage equalizing module includes a fourth capacitor, a fifth capacitor, a ninth inductor, a ninth switching tube, and a tenth switching tube; a first end of the fourth capacitor is connected to a first end of the ninth switching tube and a first end of the voltage equalizing module, a second end of the fifth capacitor is connected to a second end of the tenth switching tube and a third end of the voltage equalizing module, a second end of the fourth capacitor is connected to a first end of the fifth capacitor, a first end of the ninth inductor, and a second end of the voltage equalizing module, and a second end of the ninth inductor is connected to a second end of the ninth switching tube and a first end of the tenth switching tube.

6. The charging and discharging circuit according to claim 2, wherein When the charge and discharge circuit is in the national standard single-phase charging or the national standard single-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the second end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch; When the charge and discharge circuit is in the national standard three-phase charging or the national standard three-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the third end of the filtering module is connected to the third-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch.

7. The charge and discharge circuit according to claim 2 or 5, wherein When the charge and discharge circuit is in the US standard single-phase charging state and at the first charging power, the first end of the filtering module is connected to the first-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch; When the charge and discharge circuit is in the US standard single-phase charging state and at the second charging power, or when the charge and discharge circuit is in the US standard single-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the second end of the first switch, the first end of the second switch is connected to the second end of the second switch, the first end of the third switch is connected to the third end of the third switch, the first end of the fourth switch is connected to the third end of the fourth switch, and the first charging power is not equal to the second charging power; When the charge and discharge circuit is in the US standard two-phase charging or the US standard two-phase discharging state, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the second end of the second switch, the first end of the third switch is connected to the second end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch; When the charge and discharge circuit is in the case of US standard three-phase charging or US standard three-phase discharging, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the third end of the filtering module is connected to the third-phase live wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the third end of the fourth switch.

8. The charge and discharge circuit according to claim 5, wherein When the charge and discharge circuit is in the case of US standard split-phase discharging, the first end of the filtering module is connected to the first-phase live wire, the second end of the filtering module is connected to the second-phase live wire, the fourth end of the filtering module is connected to the neutral wire, the first end of the first switch is connected to the third end of the first switch, the first end of the second switch is connected to the third end of the second switch, the first end of the third switch is connected to the third end of the third switch, and the first end of the fourth switch is connected to the second end of the fourth switch.

9. The charge and discharge circuit according to claim 8, wherein When the charge and discharge circuit is in the case of US standard split-phase discharging, the voltage equalizing module is used to control the voltages across the two ends of the fourth capacitor and the fifth capacitor to be equal.

10. A vehicle-mounted charger, characterized in that, It includes the charge and discharge circuit according to any one of claims 1 to 9.

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