Charging and discharging circuit

Abstract

The invention relates to a charging and discharging circuit, which selectively enables first alternating current electric energy and / or first direct current electric energy to simultaneously perform bidirectional energy transmission through an EMI (Electro-Magnetic Interference) module and an electric energy conversion module by controlling the operation of switching tubes in a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm and a fifth bridge arm of the electric energy conversion module. The charging and discharging circuit can meet the charging and discharging requirements only by using a single circuit, uninterrupted power supply can be carried out in different scenes to meet the multi-purpose requirement, the electric energy conversion module can achieve alternating current / direct current conversion and direct current / alternating current conversion at the same time, namely, a direct current bus is shared, the direct current / direct current conversion link can be omitted, and the cost is reduced. The charging and discharging circuit has the advantages of being small in size, low in building cost, low in energy conversion loss, high in efficiency and good in energy-saving capacity.

Description

Technical Field

[0001] This case involves the field of charging and discharging, and in particular, refers to a charging and discharging circuit used in a vehicle charger. Background Art

[0002] As new energy vehicles become more and more popular, more and more functional requirements are placed on new energy vehicles. The charging and discharging circuits of on-board chargers currently used in new energy vehicles can only work in a single mode, that is, they can only work in charging mode or discharging mode, and cannot meet the functional requirements of simultaneous charging and discharging. For large new energy vehicles with in-vehicle charging and discharging requirements, on-board chargers and on-board inverters need to be configured at the same time, resulting in a large size and high construction cost. In addition, when energy is converted between the input and output ends of new energy vehicles, it needs to pass through the AC / DC conversion module and DC / DC conversion module of the on-board charger and the AC / DC conversion module and DC / DC conversion module of the on-board inverter at the same time, which easily increases energy conversion losses, reduces efficiency, and is not conducive to energy saving.

[0003] Therefore, how to develop a charging and discharging circuit that overcomes the above-mentioned shortcomings is an urgent need at present. Summary of the invention

[0004] The purpose of this case is to provide a charging and discharging circuit, which selectively enables the first AC power and / or the first DC power to simultaneously transmit bidirectional energy through the EMI module and the power conversion module by controlling the operation of the switch tubes in the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm and the fifth bridge arm of the power conversion module. The charging and discharging circuit of this case can meet the charging and discharging requirements with only a single circuit, and can provide uninterrupted power supply in different scenarios to meet multi-purpose requirements. In addition, the power conversion module can simultaneously achieve AC / DC conversion and DC / AC conversion, that is, share a DC bus, and save the DC / DC conversion link to improve the conversion efficiency. Therefore, the charging and discharging circuit of this case has the effects of small size, low construction cost, low energy conversion loss, high efficiency and better energy saving ability.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention is to provide a charging and discharging circuit, including a first AC port (for example, a charging / discharging port), a second AC port (for example, a discharging port), a DC charging port, an EMI module, an electric energy conversion module and a controller. The charging and discharging circuit selectively receives or provides the first AC power through the first AC port, and selectively provides the second AC power through the second AC port, and receives or provides the first DC power through the DC charging port. The EMI module includes a first end, a second end and a third end, the first end is connected to the first AC port, the second end is connected to the second AC port, and the third end has a first interface, a second interface, a third interface and a fourth interface. The electric energy conversion module is connected between the third end of the EMI module and the DC charging port, and includes a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm and a fifth bridge arm. The first bridge arm includes two first switch tubes connected in series, and the connection of the two first switch tubes constitutes a first connection point, and the first connection point is connected to the first interface. The second bridge arm includes two second switch tubes connected in series, and the connection of the two second switch tubes constitutes a second connection point, and the second connection point is connected to the first interface. The third bridge arm includes two third switch tubes connected in series, and the connection between the two third switch tubes constitutes a third connection point, and the third connection point is connected to the first interface or the second interface according to the working mode. The fourth bridge arm includes two fourth switch tubes connected in series, and the connection between the two fourth switch tubes constitutes a fourth connection point, and the fourth connection point is connected to the fourth interface. The fifth bridge arm includes two fifth switch tubes connected in series, and the connection between the two fifth switch tubes constitutes a fifth connection point, and the fifth connection point is connected to the third interface. The controller controls the operation of the switch tubes in the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm and the fifth bridge arm of the power conversion module to selectively enable the first AC power and / or the first DC power to simultaneously perform bidirectional energy transmission through the EMI module and the power conversion module.

[0006] To achieve the above-mentioned purpose, another embodiment of the present invention is to provide a charging and discharging circuit, including a first AC port (for example, a charging / discharging port), a second AC port (for example, a discharging port), a DC charging port, an EMI module, an electric energy conversion module and a controller. The charging and discharging circuit selectively receives or provides a first AC power via the first AC port, and selectively provides a second AC power via the second AC port, and receives or provides a first DC power via the DC charging port. The EMI module includes a first common-mode inductor, wherein the first common-mode inductor includes a first winding, a second winding, a third winding, a fourth winding and a first magnetic core, wherein the first winding, the second winding, the third winding and the fourth winding are wound together on the first magnetic core, and the first winding and the fourth winding are coupled to each other, and the second winding and the third winding are coupled to each other, wherein the first end of the first winding and the first end of the fourth winding are connected to the first AC port, and the first end of the second winding and the first end of the third winding are connected to the second AC port. The electric energy conversion module is connected between the EMI module and the DC charging port. The controller controls the switch tube in the power conversion module to selectively enable the first AC power and / or the first DC power to perform bidirectional energy transmission simultaneously through the EMI module and the power conversion module. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The circuit topology diagram of the charging and discharging circuit of this case;

[0008] Figure 2A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit shown in the first mode;

[0009] Figure 2B for Figure 1 The switch tube timing diagram of the charging and discharging circuit shown in the first mode;

[0010] Figure 3A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit shown in the second mode;

[0011] Figure 3B for Figure 1 The switch tube timing diagram of the charging and discharging circuit shown in the second mode;

[0012] Figure 4A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit shown in the third mode;

[0013] Figure 4B for Figure 1 The switch tube timing diagram of the charging and discharging circuit shown in the third mode;

[0014] Figure 5A for Figure 1The circuit operation topology diagram of the charging and discharging circuit shown in the fourth mode;

[0015] Figure 5B for Figure 1 The switch tube timing diagram of the charging and discharging circuit shown in the fourth mode;

[0016] Fig. 6A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit shown in the fifth mode;

[0017] Figure 6B for Figure 1 The switch tube timing diagram of the charging and discharging circuit shown in the fifth mode;

[0018] Fig. 7A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit shown in the sixth mode;

[0019] Figure 7B for Figure 1 The switch tube timing diagram of the charging and discharging circuit in the sixth mode shown; and

[0020] Figure 8 To constitute Figure 1 A schematic structural diagram of a first common-mode inductor of an EMI module of a charging and discharging circuit is shown.

[0021] The reference numerals are described as follows:

[0022] 1: Charging and discharging circuit

[0023] 21: First AC port

[0024] 22: Second AC port

[0025] 23: DC charging port

[0026] 3: EMI module

[0027] 31: First End

[0028] 32: Second end

[0029] 33: The Third End

[0030] 331: First interface

[0031] 332: Second interface

[0032] 333: The third interface

[0033] 334: Fourth interface

[0034] 34: First common mode inductor

[0035] 341: First winding

[0036] 342: Second winding

[0037] 343: Third winding

[0038] 344: Fourth winding

[0039] 345: First core

[0040] 35: Second common mode inductor

[0041] 351: Fifth winding

[0042] 352: Sixth winding

[0043] 353: Seventh winding

[0044] 354: Eighth winding

[0045] 4: Power conversion module

[0046] 41: First bridge arm

[0047] Q1: First upper tube

[0048] Q2: First down tube

[0049] 42: Second bridge arm

[0050] Q3: Second top tube

[0051] Q4: Second down tube

[0052] 43: The third bridge arm

[0053] Q5: Third top tube

[0054] Q6: Third down tube

[0055] 44: Fourth bridge arm

[0056] Q7: The fourth upper tube

[0057] Q8: Fourth down tube

[0058] 45: Fifth bridge arm

[0059] Q9: Fifth upper tube

[0060] Q10: Fifth down tube

[0061] 46: DC bus capacitor bridge arm

[0062] Cr1, Cr2: conversion capacitor

[0063] L1: First inductor

[0064] L2: Second inductor

[0065] L3: The third inductor

[0066] A: First connection point

[0067] B: Second connection point

[0068] C: Third connection point

[0069] D: Fourth connection point

[0070] E: Fifth connection point

[0071] F: Sixth connection point

[0072] RL1: First mechanical switch

[0073] RL2: Second mechanical switch

[0074] RL3: Third mechanical switch

[0075] 5: DC / DC conversion module

[0076] 6: Controller

[0077] C1: First capacitor

[0078] C2: Second capacitor

[0079] C3: The third capacitor

[0080] C4: The fourth capacitor

[0081] C5: Fifth capacitor

[0082] C6: Sixth capacitor DETAILED DESCRIPTION

[0083] Some typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different aspects, which do not deviate from the scope of the present invention, and the description and drawings therein are essentially used for illustrative purposes rather than for limiting the present invention. For example, if the following content of the present invention describes that a first feature is set on or above a second feature, it means that it includes an embodiment in which the first feature and the second feature are directly in contact, and also includes an embodiment in which an additional feature can be set between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, different embodiments of the present invention may use repeated reference symbols and / or marks. These repetitions are for the purpose of simplicity and clarity, and are not used to limit the relationship between the various embodiments and / or the appearance structure. In addition, when a component is referred to as "connected to" or "coupled to" another component, it may be directly connected to or coupled to another component, or there may be an intervening component. Although the numerical ranges and parameters of the broad scope of the present invention are approximate, the numerical values ​​are stated in the specific examples as accurately as possible. In addition, it is understood that although the terms "first", "second", "third", etc. may be used in the claims to describe different components, these components should not be limited by these terms, and these components described accordingly in the embodiments are represented by different component symbols. These terms are intended to distinguish different components. For example: a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component without departing from the scope of the embodiments. The term "and / or" used in this manner includes any or all combinations of one or more of the related listed items.

[0084] See also Figure 1 , which is a circuit topology diagram of the charging and discharging circuit of the present invention. As shown in the figure, the charging and discharging circuit 1 of the present invention is connected to a charging gun (not shown), a receiving port inside a car (not shown) and a high-voltage battery (not shown) to selectively receive the first AC power provided by the charging gun, or provide the first AC power to the charging gun, and the charging and discharging circuit 1 can selectively provide the second AC power to the receiving port inside the car, and the charging and discharging circuit 1 can further selectively receive the third AC power provided by the high-voltage battery, or provide the third AC power to the high-voltage battery. The charging and discharging circuit 1 of the present invention is, for example, an on-board charger (On Board Charge Module, OBCM).

[0085] The charging and discharging circuit 1 includes a first AC port 21, a second AC port 22, a DC charging port 23, an EMI module 3, a power conversion module 4 and a controller 6. The charging and discharging circuit 1 is connected to the charging gun using the first AC port 21, and the charging and discharging circuit 1 selectively receives or provides the first AC power through the first AC port 21. The charging and discharging circuit 1 is connected to the internal receiving port of the car using the second AC port 22, and the charging and discharging circuit 1 selectively provides the second AC power through the second AC port 22. The charging and discharging circuit 1 is connected to the high-voltage battery using the DC charging port 23, and the charging and discharging circuit 1 selectively receives or provides the first DC power. The charging and discharging circuit 1 selects different conversion modes according to different working modes, which will be explained later.

[0086] The EMI module 3 includes a first end 31, a second end 32, and a third end 33. The first end 31 of the EMI module 3 is connected to the first AC port 21 and has two interfaces, the second end 32 of the EMI module 3 is connected to the second AC port 22 and has two interfaces, and the third end 33 of the EMI module 3 has a first interface 331, a second interface 332, a third interface 333, and a fourth interface 334.

[0087] The power conversion module 4 is connected between the third end 33 of the EMI module 3 and the DC charging port 23, and includes a first bridge arm 41, a second bridge arm 42, a third bridge arm 43, a fourth bridge arm 44, and a fifth bridge arm 45. In one embodiment, the charge and discharge circuit 1 further includes a first inductor L1, a second inductor L2, and a third inductor L3. The first bridge arm 41 includes two first switch tubes (i.e., a first upper tube Q1 and a first lower tube Q2), the two first switch tubes (i.e., the first upper tube Q1 and the first lower tube Q2) are connected in series, and the connection between the two first switch tubes (i.e., the first upper tube Q1 and the first lower tube Q2) constitutes a first connection point A, and the first connection point A is connected to the first interface 331 of the third end 33 of the EMI module 3 via the first inductor L1, for example. The second bridge arm 42 includes two second switch tubes (i.e., a second upper tube Q3 and a second lower tube Q4), the two second switch tubes (i.e., the second upper tube Q3 and the second lower tube Q4) are connected in series, and the connection between the two second switch tubes (i.e., the second upper tube Q3 and the second lower tube Q4) constitutes a second connection point B, and the second connection point B is connected to the first interface 331 of the third end 33 of the EMI module 3, for example, via the second inductor L2. The third bridge arm 43 includes two third switch tubes (i.e., a third upper tube Q5 and a third lower tube Q6), the two third switch tubes (i.e., the third upper tube Q5 and the third lower tube Q6) are connected in series, and the connection between the two third switch tubes (i.e., the third upper tube Q5 and the third lower tube Q6) constitutes a third connection point C, and the third connection point C is connected to the first interface 331 or the second interface 332 of the third end 33 of the EMI module 3, for example, via the third inductor L3 according to different working modes. The fourth bridge arm 44 includes two fourth switch tubes (i.e., a fourth upper tube Q7 and a fourth lower tube Q8), the two fourth switch tubes (i.e., a fourth upper tube Q7 and a fourth lower tube Q8) are connected in series, and the connection between the two fourth switch tubes (i.e., the fourth upper tube Q7 and the fourth lower tube Q8) constitutes a fourth connection point D, and the fourth connection point D is connected to the fourth interface 334 of the third end 33 of the EMI module 3. The fifth bridge arm 45 includes two fifth switch tubes (i.e., a fifth upper tube Q9 and a fifth lower tube Q10), the two fifth switch tubes (i.e., the fifth upper tube Q9 and the fifth lower tube Q10) are connected in series, and the connection between the two fifth switch tubes (i.e., the fifth upper tube Q9 and the fifth lower tube Q10) constitutes a fifth connection point E, and the fifth connection point E is connected to the third interface 333 of the third end 33 of the EMI module 3. In one embodiment, the charging and discharging circuit 1 further includes a DC bus capacitor bridge arm 46, the DC bus capacitor bridge arm 46 includes two conversion capacitors Cr1 and Cr2, the two conversion capacitors Cr1 and Cr2 are connected in series, and the connection between the two conversion capacitors Cr1 and Cr2 constitutes a sixth connection point F, and the sixth connection point F is connected to the fourth connection point D of the fourth bridge arm 44.In this embodiment, the first bridge arm 41, the second bridge arm 42, the third bridge arm 43, the fourth bridge arm 44 and the fifth bridge arm 45 of the power conversion module 4 together constitute an AC / DC converter and a DC / AC converter, such as a PFC converter and a DC / AC inverter, wherein one input end of the AC / DC converter and the DC / AC converter is connected to the charging gun, and bidirectional energy transmission can be performed, that is, charging function and discharge function can be realized, and the other input end of the AC / DC converter and the DC / AC converter is connected to the internal receiving port of the car. In this embodiment, the switch tubes in the first bridge arm 41, the second bridge arm 42, the third bridge arm 43, the fourth bridge arm 44 and the fifth bridge arm 45 can be, for example, Si MOSFET, SiC MOSFET, IGBT, GaN and other types of devices. In other embodiments, the AC / DC converter and the AC / DC converter in the DC / AC converter may also be a multi-way totem pole PFC topology staggered in parallel, and the DC / AC converter and the DC / AC converter may also be a multi-way totem pole PFC topology staggered in parallel, but the present case is not limited thereto.

[0088] In one embodiment, the charge and discharge circuit 1 further includes a first mechanical switch RL1, a second mechanical switch RL2, and a third mechanical switch RL3, wherein the first end of the first mechanical switch RL1 is connected to the first interface 331 of the third end 33 of the EMI module 3, the first end of the second mechanical switch RL2 is connected to the second interface 332 of the third end 33 of the EMI module 3, and the second end of the first mechanical switch RL1, the second end of the second mechanical switch RL2 and the third connection point C of the third bridge arm 43 are connected together. In other words, the third connection point C is respectively connected to the first interface 331 and the second interface 332 of the third end 33 of the EMI module 3 via the first mechanical switch RL1 and the second mechanical switch RL2. The first end of the third mechanical switch RL3 is connected to the fourth connection point D of the fourth bridge arm 44 of the power conversion module 4, and the second end of the third mechanical switch RL3 is connected to the sixth connection point F of the DC bus capacitor bridge arm 46 of the power conversion module 4, wherein the third mechanical switch RL3 can realize the switching between the totem pole topology (the first bridge arm 41, the second bridge arm 42 and the fourth bridge arm 44) and the half-bridge topology (the fourth bridge arm 44 and the DC bus capacitor bridge arm 46).

[0089] In one embodiment, the charging and discharging circuit 1 further includes a DC / DC conversion module 5, and the DC / DC conversion module 5 can be, but is not limited to, LLC, CLLC, hard switch, or DAB circuit topology. In addition, the DC / DC conversion module 5 can also be an isolated converter, and its primary circuit can be a full-bridge circuit or a half-bridge circuit, and its secondary circuit can be a full-bridge circuit, a half-bridge circuit, or a circuit with a center tap. The DC / DC conversion module 5 is connected between the power conversion module 4 and the DC charging port 23 to perform DC power conversion. The controller 6 is connected to the first AC port 21, the second AC port 22, the DC charging port 23, and the power conversion module 4, and controls the operation of the switch tubes in the first bridge arm 41, the second bridge arm 42, the third bridge arm 43, the fourth bridge arm 44, and the fifth bridge arm 45 of the power conversion module 4 to selectively enable the first AC power and / or the first DC power to simultaneously perform bidirectional energy transmission through the EMI module 3 and the power conversion module 4.

[0090] The following will further describe how the controller 6 controls the corresponding switch tubes according to different modes. Figure 2A and Figure 2B And cooperate Figure 1 ,in Figure 2A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the first mode is shown. Figure 2B for Figure 1 The timing diagram of the switch tube of the charging and discharging circuit in the first mode is shown in FIG. Figure 2A As shown, when the controller 6 confirms that the charging energy of the first AC power of the first AC port 21 is greater than or equal to the discharging energy of the second AC power of the second AC port 22, the second mechanical switch RL2 is controlled to be turned on, and the first mechanical switch RL1 is controlled to be turned off. The controller 6 controls the first bridge arm 41, the second bridge arm 42 and the fourth bridge arm 44 to form an AC / DC converter. The AC / DC converter is, for example, a two-way staggered totem pole PFC topology, wherein the switch tubes of the first bridge arm 41 and the second bridge arm 42 are used as high-frequency chopping switch tubes, and the switch tube of the fourth bridge arm 44 is used as a high-frequency chopping switch tube. As an industrial frequency switch tube, the power conversion module 4 converts the first AC power of the first AC port 21 into the first DC power, and provides the first DC power to the DC charging port 23, and the controller 6 simultaneously controls the third bridge arm 43 and the fifth bridge arm 45 to form a DC / AC converter, wherein the switch tube of the third bridge arm 43 serves as a high-frequency chopping switch tube, and the switch tube of the fifth bridge arm 45 serves as an industrial frequency switch tube, so that the power conversion module 4 simultaneously converts the first AC power of the first AC port 21 into the second AC power, and provides the second AC power to the second AC port 22. The excess charging energy of the first AC power of the first AC port 21 can be provided to the high-voltage battery for charging through a bidirectional DC / DC conversion method. In this embodiment, Figure 2BAs shown, the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43 are the same; the driving signals of the first lower tube Q2 of the first bridge arm 41, the second lower tube Q4 of the second bridge arm 42 and the third lower tube Q6 of the third bridge arm 43 are the same, and are complementary to the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43; the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45 are the same; the driving signals of the fourth lower tube Q8 of the fourth bridge arm 44 and the fifth lower tube Q10 of the fifth bridge arm 45 are the same, and are complementary to the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45.

[0091] See also Figure 3A and Figure 3B And cooperate Figure 1 ,in Figure 3A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the second mode is shown. Figure 3B for Figure 1 The charging and discharging circuit shown in FIG. 1 is a timing diagram of the switch tube in the second mode. In the second mode, Figure 3A As shown, when the controller 6 confirms that the charging energy of the first AC power of the first AC port 21 is less than the discharging energy of the second AC power of the second AC port 22, the second mechanical switch RL2 is controlled to be turned on, and the first mechanical switch RL1 is controlled to be turned off, and the controller 6 controls the first bridge arm 41, the second bridge arm 42 and the fourth bridge arm 44 to form an AC / DC converter, and the AC / DC converter is, for example, a two-way staggered totem pole PFC topology, wherein the switch tubes of the first bridge arm 41 and the second bridge arm 42 are used as high-frequency chopping switch tubes, and the switch tube of the fourth bridge arm 44 is used as The industrial frequency switch tube enables the power conversion module 4 to convert the first AC power of the first AC port 21 into the second DC power, and the controller 6 simultaneously controls the switch tubes of the third bridge arm 43 and the fifth bridge arm 45 to form a DC / AC converter, wherein the switch tube of the third bridge arm 43 serves as a high-frequency chopping switch tube, and the switch tube of the fifth bridge arm 45 serves as an industrial frequency switch tube, so that the power conversion module 4 simultaneously converts the first DC power of the DC charging port 23 and the second DC power converted by the power conversion module 4 into the second AC power, and provides the second AC power to the second AC port 22. The insufficient charging energy of the first AC power of the first AC port 21 can be supplemented by the first DC power of the DC charging port 23 to provide energy to the second AC port 22. In this embodiment, Figure 3BAs shown, the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43 are the same; the driving signals of the first lower tube Q2 of the first bridge arm 41, the second lower tube Q4 of the second bridge arm 42 and the third lower tube Q6 of the third bridge arm 43 are the same, and are complementary to the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43; the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45 are the same; the driving signals of the fourth lower tube Q8 of the fourth bridge arm 44 and the fifth lower tube Q10 of the fifth bridge arm 45 are the same, and are complementary to the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45.

[0092] See also Figure 4A and Figure 4B And cooperate Figure 1 ,in Figure 4A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the third mode is shown. Figure 4B for Figure 1 The charging and discharging circuit shown in FIG. 1 is a timing diagram of the switch tube in the third mode. In the third mode, Figure 4A As shown, when the controller 6 controls the first AC port 21 and the second AC port 22 to be in the discharge mode, the controller 6 controls the second mechanical switch RL2 to be turned on, and controls the first mechanical switch RL1 to be turned off, and the controller 6 controls the first bridge arm 41, the second bridge arm 42 and the fourth bridge arm 44 to form a DC / AC converter, and the AC / DC converter is, for example, a two-way staggered totem pole PFC topology, wherein the switch tubes of the first bridge arm 41 and the second bridge arm 42 are used as high-frequency chopping switch tubes, and the switch tube of the fourth bridge arm 44 is used as an industrial frequency switch The power conversion module 4 converts the first DC power of the DC charging port 23 into the first AC power, and provides the first AC power to the first AC port 21, and the controller 6 simultaneously controls the third bridge arm 43 and the fifth bridge arm 45 as a DC / AC converter, wherein the switch tube of the third bridge arm 43 is used as a high-frequency chopping switch tube, and the switch tube of the fifth bridge arm 45 is used as an industrial frequency switch tube, so that the power conversion module 4 simultaneously converts the first DC power of the DC charging port 23 into the second AC power, and provides the second AC power to the second AC port 22. The energy of the high-voltage battery is discharged to the first AC port 21 and the second AC port 22 through bidirectional DC / DC. In this embodiment, Figure 4BAs shown, the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43 are the same; the driving signals of the first lower tube Q2 of the first bridge arm 41, the second lower tube Q4 of the second bridge arm 42 and the third lower tube Q6 of the third bridge arm 43 are the same, and are complementary to the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42 and the third upper tube Q5 of the third bridge arm 43; the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45 are the same; the driving signals of the fourth lower tube Q8 of the fourth bridge arm 44 and the fifth lower tube Q10 of the fifth bridge arm 45 are the same, and are complementary to the driving signals of the fourth upper tube Q7 of the fourth bridge arm 44 and the fifth upper tube Q9 of the fifth bridge arm 45.

[0093] See also Figure 5A and Figure 5B And cooperate Figure 1 ,in Figure 5A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the fourth mode is shown. Figure 5B for Figure 1 The switch timing diagram of the charging and discharging circuit in the fourth mode is shown in FIG. Figure 5A As shown, when the external receiving port of the car (i.e., the first AC port 21) is in standby mode, the controller 6 controls the second mechanical switch RL2 to be turned on, and controls the first mechanical switch RL1 to be turned off. The controller 6 controls the third bridge arm 43 and the fifth bridge arm 45 to form a DC / AC converter, wherein the switch tube of the third bridge arm 43 is used as a high-frequency chopper switch tube, and the switch tube of the fifth bridge arm 45 is used as an industrial frequency switch tube, so that the power conversion module 4 converts the first DC power of the DC charging port 23 into the second AC power, and provides the second AC power to the second AC port 22. The energy of the high-voltage battery is discharged to the second AC port 22 through bidirectional DC / DC. In this embodiment, as Figure 5B As shown, the two first switch tubes (i.e., the first upper tube Q1 and the first lower tube Q2), the two second switch tubes (i.e., the second upper tube Q3 and the second lower tube Q4) and the two fourth switch tubes (i.e., the fourth upper tube Q7 and the fourth lower tube Q8) remain in the off state, the driving signals of the third upper tube Q5 and the third lower tube Q6 of the third bridge arm 43 are complementary, and the driving signals of the fifth upper tube Q9 and the fifth lower tube Q10 of the fifth bridge arm 45 are complementary.

[0094] See also Fig. 6A and Figure 6B And cooperate Figure 1 ,in Fig. 6A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the fifth mode is shown. Figure 6B for Figure 1The charging and discharging circuit shown in FIG. 1 is a switching tube timing diagram in the fifth mode. In the fifth mode, Fig. 6A As shown, when only the external receiving port of the automobile is in the discharge mode, the controller 6 controls the first mechanical switch RL1 to be turned on, and controls the second mechanical switch RL2 to be turned off, and the controller 6 controls the first bridge arm 41, the second bridge arm 42, the third bridge arm 43 and the fourth bridge arm 44 to form a DC / AC converter. The AC / DC converter is, for example, a three-way staggered totem pole PFC topology, wherein the switch tubes of the first bridge arm 41, the second bridge arm 42 and the third bridge arm 43 are used as high-frequency chopping switch tubes, and the switch tube of the fourth bridge arm 44 is used as an industrial frequency switch tube, so that the power conversion module 4 converts the first DC power of the DC charging port 23 into the first AC power, and provides the first AC power to the first AC port 21. The energy of the high-voltage battery is discharged to the first AC port 21 through bidirectional DC / DC. In this embodiment, as Figure 6B As shown, the two fifth switch tubes (i.e., the fifth upper tube Q9 and the fifth lower tube Q10) remain in the off state, the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42, and the third upper tube Q5 of the third bridge arm 43 are the same, the driving signals of the first lower tube Q2 of the first bridge arm 41, the second lower tube Q4 of the second bridge arm 42, and the third lower tube Q6 of the third bridge arm 43 are the same, and are complementary to the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42, and the third upper tube Q5 of the third bridge arm 43; the driving signals of the fourth upper tube Q7 and the fourth lower tube Q8 of the fourth bridge arm 44 are complementary.

[0095] See also Fig. 7A and Figure 7B And cooperate Figure 1 ,in Fig. 7A for Figure 1 The circuit operation topology diagram of the charging and discharging circuit in the sixth mode is shown. Figure 7B for Figure 1 The switch tube timing diagram of the charging and discharging circuit in the sixth mode is shown in FIG. Fig. 7A As shown, when only the charging gun is charging, the controller 6 controls the first mechanical switch RL1 to be turned on, and controls the second mechanical switch RL2 to be turned off, and the controller 6 controls the first bridge arm 41, the second bridge arm 42, the third bridge arm 43 and the fourth bridge arm 44 to form an AC / DC converter. The AC / DC converter is, for example, a three-way staggered totem pole PFC topology, wherein the switch tubes of the first bridge arm 41, the second bridge arm 42 and the third bridge arm 43 are used as high-frequency chopping switch tubes, and the switch tube of the fourth bridge arm 44 is used as an industrial frequency switch tube, so that the power conversion module 4 converts the first AC power of the first AC port 21 into the first DC power, and provides the first DC power to the DC charging port 23. The charging gun charges the high-voltage battery through bidirectional DC / DC conversion. In this embodiment, as Figure 7B As shown, the two fifth switch tubes (i.e., the fifth upper tube Q9 and the fifth lower tube Q10) remain in the off state, the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42, and the third upper tube Q5 of the third bridge arm 43 are the same, the driving signals of the first lower tube Q2 of the first bridge arm 41, the second lower tube Q4 of the second bridge arm 42, and the third lower tube Q6 of the third bridge arm 43 are the same, and are complementary to the driving signals of the first upper tube Q1 of the first bridge arm 41, the second upper tube Q3 of the second bridge arm 42, and the third upper tube Q5 of the third bridge arm 43; the driving signals of the fourth upper tube Q7 and the fourth lower tube Q8 of the fourth bridge arm 44 are complementary.

[0096] As can be seen from the above, the charge and discharge circuit 1 of the present case selectively enables the first AC power and / or the first DC power to simultaneously transmit bidirectional energy (e.g., the first working mode, the second working mode, and the third working mode) through the EMI module 3 and the power conversion module 4 by controlling the operation of the switch tubes in the first bridge arm 41, the second bridge arm 42, the third bridge arm 43, the fourth bridge arm 44, and the fifth bridge arm 45 of the power conversion module 4. Compared with the traditional charge and discharge circuit that can only work in a single mode, or requires at least two devices to charge and discharge, the charge and discharge circuit 1 of the present case can achieve the simultaneous charging and discharging requirements using only a single circuit, and can provide uninterrupted power supply in different scenarios to meet multi-purpose requirements. In addition, the power conversion module 4 can simultaneously achieve AC / DC conversion and DC / AC conversion, that is, share the DC bus, and can save the DC / DC conversion link to improve the conversion efficiency. Therefore, the charge and discharge circuit 1 of the present case has the effects of small size, low construction cost, low energy conversion loss, high efficiency, and better energy saving ability.

[0097] See also Figure 8 And cooperate Figure 1 ,in Figure 8 To constitute Figure 1 The schematic diagram of the structure of the first common mode inductor of the EMI module of the charging and discharging circuit shown in FIG. Figure 1 As shown, the EMI module 3 is, for example, a two-stage AC EMI filter, and includes a first common mode inductor 34, a second common mode inductor 35, and six capacitors. Figure 1 and Figure 8As shown, the first common-mode inductor 34 is composed of a first winding 341, a second winding 342, a third winding 343, a fourth winding 344 and a first magnetic core 345, the first end of the first winding 341 constitutes a first interface of two interfaces of the first end 31 of the EMI module 3, the first end of the second winding 342 constitutes a first interface of two interfaces of the second end 32 of the EMI module 3, the first end of the third winding 343 constitutes a second interface of two interfaces of the second end 32 of the EMI module 3, and the first end of the fourth winding 344 constitutes a second interface of two interfaces of the first end 31 of the EMI module 3, wherein the first interface and the second interface of the first end 31 of the EMI module 3 are connected to the first AC port 21, the first interface and the second interface of the second end 32 of the EMI module 3 are connected to the second AC port 22, and as shown Figure 8 As shown, the first winding 341, the second winding 342, the third winding 343 and the fourth winding 344 are wound together on the first magnetic core 345 and two adjacent windings are coupled to each other, that is, the first winding 341 and the fourth winding 344 are coupled to each other, and the second winding 342 and the third winding 343 are coupled to each other. In this embodiment, the first magnetic core 345 can be, but is not limited to, a circular magnetic core, a UU magnetic core, a UI magnetic core and an EQ magnetic core.

[0098] In terms of structure, the second common mode inductor 35 is similar to Figure 8 The second common-mode inductor 35 includes a fifth winding 351, a sixth winding 352, a seventh winding 353, an eighth winding 354 and a second magnetic core, wherein a first end of the fifth winding 351 is connected to a second end of the first winding 341, a second end of the fifth winding 351 constitutes a first interface 331 of the third end 33 of the EMI module 3, a first end of the sixth winding 352 is connected to a second end of the second winding 342, a second end of the sixth winding 352 constitutes a second interface 332 of the third end 33 of the EMI module 3, a first end of the seventh winding 353 is connected to a second end of the third winding 343, a second end of the seventh winding 353 constitutes a third interface 333 of the third end 33 of the EMI module 3, a first end of the eighth winding 354 is connected to a second end of the fourth winding 344, a second end of the eighth winding 354 constitutes a fourth interface 334 of the third end 33 of the EMI module 3, and as Figure 8As shown, the fifth winding 351, the sixth winding 352, the seventh winding 353 and the eighth winding 354 are wound together on the second magnetic core and the adjacent two windings are coupled to each other, that is, the fifth winding 351 and the eighth winding 354 are coupled to each other, and the sixth winding 352 and the seventh winding 353 are coupled to each other. Therefore, the first common-mode inductor 34 and the second common-mode inductor 35 are both composed of four windings wound on the same magnetic core, that is, they adopt an integrated structure. Of course, in some embodiments, the EMI module 3 is not limited to a two-stage AC EMI filter, but can also be a three-stage AC EMI filter or a single-stage AC EMI filter. As can be seen from the above, the first common-mode inductor 34 and the second common-mode inductor 35 of the EMI module 3 are arranged in an integrated manner, so the charging AC common-mode inductor (such as the first winding and the fourth winding) and the discharging AC common-mode inductor (such as the second winding and the third winding) share the same magnetic core, which can improve the power density and reduce the device setting cost.

[0099] In some embodiments, the EMI module 3 includes only a single common mode inductor, namely Figure 1 The first common-mode inductor 34 in this embodiment, the first connection point A is directly connected to the second end of the first winding 341 via the first inductor L1, the second connection point B is directly connected to the second end of the first winding 341 via the second inductor L2, the third connection point C is connected to the second end of the second winding 342 and the second end of the first winding 341 via the third inductor L3, the fourth connection point D is connected to the second end of the fourth winding 344, and the fifth connection point E is connected to the second end of the third winding 343.

[0100] In this embodiment, the six capacitors of the EMI module 3 include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. The first capacitor C1 is connected between the first end of the first winding 341 and the first end of the fourth winding 344, the second capacitor C2 is connected between the first end of the second winding 342 and the first end of the third winding 343, the third capacitor C3 is connected between the second end of the first winding 341 and the second end of the fourth winding 344, the fourth capacitor C4 is connected between the second end of the second winding 342 and the second end of the third winding 343, the fifth capacitor C5 is connected between the second end of the fifth winding 351 and the second end of the eighth winding 354, and the sixth capacitor C6 is connected between the second end of the sixth winding 352 and the second end of the seventh winding 353.

[0101] In summary, the charge and discharge circuit of the present case selectively enables the first AC power and / or the first DC power to simultaneously transmit bidirectional energy through the EMI module and the power conversion module by controlling the operation of the switch tubes in the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm and the fifth bridge arm of the power conversion module. The charge and discharge circuit of the present case can meet the charging and discharging requirements with only a single circuit, and can provide uninterrupted power supply in different scenarios to meet multi-purpose requirements. In addition, the power conversion module can simultaneously achieve AC / DC conversion and DC / AC conversion, that is, share the DC bus, and can save the DC / DC conversion link to improve the conversion efficiency. Therefore, the charge and discharge circuit of the present case has the effects of small size, low construction cost, low energy conversion loss, high efficiency and better energy saving ability. In addition, the first common mode inductor and the second common mode inductor of the EMI module of the charge and discharge circuit of the present case are set in an integrated manner, so the charging AC common mode inductor and the discharging AC common mode inductor share the same magnetic core, which can improve the power density and reduce the device setting cost.

Claims

1. A charging and discharging circuit, comprising: a first AC port, a second AC port and a DC charging port, wherein the charging and discharging circuit selectively receives or provides a first AC power via the first AC port, selectively provides a second AC power via the second AC port, and receives or provides a first DC power via the DC charging port; An EMI module comprises a first end, a second end and a third end, wherein the first end is connected to the first AC port, the second end is connected to the second AC port, and the third end has a first interface, a second interface, a third interface and a fourth interface; an electric energy conversion module connected between the third terminal of the EMI module and the DC charging port, and comprising: A first bridge arm, comprising two first switch tubes connected in series, wherein a connection point of the two first switch tubes constitutes a first connection point, and the first connection point is connected to the first interface; A second bridge arm, comprising two second switch tubes connected in series, wherein a connection point of the two second switch tubes constitutes a second connection point, and the second connection point is connected to the first interface; a third bridge arm, comprising two third switch tubes connected in series, wherein a connection point of the two third switch tubes constitutes a third connection point, and the third connection point is connected to the first interface or the second interface according to a working mode; a fourth bridge arm, comprising two fourth switch tubes connected in series, wherein a connection point of the two fourth switch tubes constitutes a fourth connection point, and the fourth connection point is connected to the fourth interface; and A fifth bridge arm, comprising two fifth switch tubes connected in series, wherein the connection between the two fifth switch tubes constitutes a fifth connection point, and the fifth connection point is connected to the third interface; and a controller, which controls the operation of the switch tubes in the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm and the fifth bridge arm of the power conversion module to selectively enable the first AC power and / or the first DC power to simultaneously perform bidirectional energy transmission via the EMI module and the power conversion module.

2. The charge and discharge circuit as claimed in claim 1, wherein the EMI module comprises a first common-mode inductor, the first common-mode inductor comprises a first winding, a second winding, a third winding, a fourth winding and a first magnetic core, wherein a first end of the first winding constitutes a first interface of the first end of the EMI module, a first end of the second winding constitutes a first interface of the second end of the EMI module, a first end of the third winding constitutes a second interface of the second end of the EMI module, and a first end of the fourth winding constitutes a second interface of the first end of the EMI module, wherein the first interface and the second interface of the first end of the EMI module are connected to the first AC port, and the first interface and the second interface of the second end of the EMI module are connected to the second AC port, and the first winding, the second winding, the third winding and the fourth winding are wound together on the first magnetic core, and the first winding and the fourth winding are coupled to each other, and the second winding and the third winding are coupled to each other.

3. The charge and discharge circuit as described in claim 2, wherein the EMI module further includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the first capacitor is connected between the first end of the first winding and the first end of the fourth winding, the second capacitor is connected between the first end of the second winding and the first end of the third winding, the third capacitor is connected between the second end of the first winding and the second end of the fourth winding, and the fourth capacitor is connected between the second end of the second winding and the second end of the third winding.

4. The charge and discharge circuit as claimed in claim 2, wherein the EMI module further comprises a second common mode inductor, the second common mode inductor comprises a fifth winding, a sixth winding, a seventh winding, an eighth winding and a second magnetic core, wherein a first end of the fifth winding is connected to a second end of the first winding, a second end of the fifth winding constitutes the first interface of the third end of the EMI module, a first end of the sixth winding is connected to a second end of the second winding, a second end of the sixth winding constitutes the first interface of the third end of the EMI module A first end of the seventh winding is connected to a second end of the third winding, and a second end of the seventh winding constitutes the fourth interface of the third end of the EMI module; a first end of the eighth winding is connected to a second end of the fourth winding, and a second end of the eighth winding constitutes the third interface of the third end of the EMI module; and the fifth winding, the sixth winding, the seventh winding and the eighth winding are wound together on the second magnetic core, and the fifth winding and the eighth winding are coupled to each other, and the sixth winding and the seventh winding are coupled to each other.

5. The charge and discharge circuit as described in claim 4, wherein the EMI module further includes a fifth capacitor and a sixth capacitor, the fifth capacitor is connected between the second end of the fifth winding and the second end of the eighth winding, and the sixth capacitor is connected between the second end of the sixth winding and the second end of the seventh winding.

6. The charging and discharging circuit as described in claim 1, wherein the power conversion module further includes a DC bus capacitor bridge arm, including two conversion capacitors connected in series, and the connection between the two conversion capacitors constitutes a sixth connection point, and the sixth connection point is connected to the fourth connection point via a third mechanical switch. 7 . The charging and discharging circuit as claimed in claim 1 , wherein the charging and discharging circuit further comprises a DC / DC conversion module connected between the power conversion module and the DC charging port.

8. The charge and discharge circuit as described in claim 1, wherein the charge and discharge circuit further comprises a first mechanical switch and a second mechanical switch, wherein the first end of the first mechanical switch is connected to the first interface of the third end of the EMI module, the first end of the second mechanical switch is connected to the second interface of the third end of the EMI module, and the second end of the first mechanical switch, the second end of the second mechanical switch and the third connection point of the third bridge arm are connected together.

9. The charging and discharging circuit as described in claim 8, wherein the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off when the controller confirms that the charging energy of the first AC power of the first AC port is greater than or equal to the discharging energy of the second AC power of the second AC port according to the working mode, and controls the first mechanical switch to be turned off, the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the first DC power and provide the first DC power to the DC charging port, and the controller controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the second AC power and provide the second AC power to the second AC port.

10. The charging and discharging circuit as described in claim 8, wherein the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off when it is confirmed according to the working mode that the charging energy of the first AC power of the first AC port is less than the discharging energy of the second AC power of the second AC port, and the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm so that the power conversion module converts the first AC power of the first AC port into a second DC power, and the controller controls the third bridge arm and the fifth bridge arm so that the power conversion module converts the first DC power and the second DC power of the DC charging port into the second AC power, and provides the second AC power to the second AC port.

11. The charge and discharge circuit as described in claim 8, when the controller controls the first AC port and the second AC port to be in the discharge mode, the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off, and the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the first AC power and provide the first AC power to the first AC port, and the controller further controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the second AC power and provide the second AC power to the second AC port.

12. The charge-discharge circuit according to any one of claims 9 to 11, wherein the two first switch tubes include a first upper tube and a first lower tube, the two second switch tubes include a second upper tube and a second lower tube, the two third switch tubes include a third upper tube and a third lower tube, the two fourth switch tubes include a fourth upper tube and a fourth lower tube, and the two fifth switch tubes include a fifth upper tube and a fifth lower tube; wherein, The driving signals of the first upper tube, the second upper tube and the third upper tube are the same, the driving signals of the first lower tube, the second lower tube and the third lower tube are the same and complementary to the driving signals of the first upper tube, the second upper tube and the third upper tube; the driving signals of the fourth upper tube and the fifth upper tube are the same, the driving signals of the fourth lower tube and the fifth lower tube are the same and complementary to the driving signals of the fourth upper tube and the fifth upper tube.

13. The charging and discharging circuit as described in claim 8, wherein the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off according to the working mode, and the controller controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the second AC power and provide the second AC power to the second AC port.

14. The charge-discharge circuit as claimed in claim 13, wherein the two third switch tubes include a third upper tube and a third lower tube, and the two fifth switch tubes include a fifth upper tube and a fifth lower tube, wherein: The two first switch tubes, the two second switch tubes and the two fourth switch tubes are kept in the off state, the driving signals of the third upper tube and the third lower tube are complementary, and the driving signals of the fifth upper tube and the fifth lower tube are complementary.

15. The charging and discharging circuit as described in claim 8, wherein the controller controls the first mechanical switch to be turned on and controls the second mechanical switch to be turned off according to the working mode, and the controller controls the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the first AC power and provide the first AC power to the first AC port.

16. The charging and discharging circuit as described in claim 8, wherein the controller controls the first mechanical switch to be turned on and controls the second mechanical switch to be turned off according to the working mode, and the controller controls the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the first DC power and provide the first DC power to the DC charging port.

17. The charge-discharge circuit as claimed in claim 15 or 16, wherein the two first switch tubes include a first upper tube and a first lower tube, the two second switch tubes include a second upper tube and a second lower tube, the two third switch tubes include a third upper tube and a third lower tube, and the two fourth switch tubes include a fourth upper tube and a fourth lower tube, wherein: The two fifth switch tubes remain in the off state, the driving signals of the first upper tube, the second upper tube and the third upper tube are the same, the driving signals of the first lower tube, the second lower tube and the third lower tube are the same, and are complementary to the driving signals of the first upper tube, the second upper tube and the third upper tube; the driving signals of the fourth upper tube are complementary to those of the fourth lower tube.

18. The charging and discharging circuit as described in claim 8, wherein the power conversion module further includes a first inductor, a second inductor and a third inductor, wherein the first connection point is connected to the first interface via the first inductor, the second connection point is connected to the first interface via the second inductor, and the third connection point is connected to the first interface and the second interface via the first mechanical switch and the second mechanical switch respectively.

19. A charging and discharging circuit, comprising: a first AC port, a second AC port and a DC charging port, wherein the charging and discharging circuit selectively receives or provides a first AC power via the first AC port, selectively provides a second AC power via the second AC port, and receives or provides a first DC power via the DC charging port; An EMI module, comprising a first common mode inductor, wherein the first common mode inductor comprises a first winding, a second winding, a third winding, a fourth winding and a first magnetic core, wherein the first winding, the second winding, the third winding and the fourth winding are wound together on the first magnetic core, and the first winding is coupled to the fourth winding, and the third winding is coupled to the fourth winding, wherein a first end of the first winding and a first end of the fourth winding are connected to the first AC port, and a first end of the second winding and a first end of the third winding are connected to the second AC port; an electric energy conversion module connected between the EMI module and the DC charging port; and A controller controls the switch tube in the power conversion module to selectively transmit the first AC power and / or the first DC power through the EMI module and the power conversion module in a bidirectional manner.

20. The charge and discharge circuit as described in claim 19, wherein the EMI module further includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, the first capacitor is connected between the first end of the first winding and the first end of the fourth winding, the second capacitor is connected between the first end of the second winding and the first end of the third winding, the third capacitor is connected between a second end of the first winding and a second end of the fourth winding, and the fourth capacitor is connected between a second end of the second winding and a second end of the third winding.

21. The charge and discharge circuit as claimed in claim 19, wherein the power conversion module comprises a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm and a fifth bridge arm, the first bridge arm comprises two first switch tubes connected in series, the connection of the two first switch tubes constitutes a first connection point, and the first connection point is connected to a second end of the first winding via a first inductor; the second bridge arm comprises two second switch tubes connected in series, the connection of the two second switch tubes constitutes a second connection point, and the second connection point is connected to the second end of the first winding via a second inductor; the third bridge arm It includes two third switch tubes connected in series, and the connection between the two third switch tubes constitutes a third connection point. The third connection point is connected to a second end of the second winding or the second end of the first winding via a third inductor according to a working mode; the fourth bridge arm includes two fourth switch tubes connected in series, and the connection between the two fourth switch tubes constitutes a fourth connection point, which is connected to a second end of the fourth winding; the fifth bridge arm includes two fifth switch tubes connected in series, and the connection between the two fifth switch tubes constitutes a fifth connection point, which is connected to a second end of the third winding.

22. The charge-discharge circuit as claimed in claim 21, wherein the EMI module further comprises a second common-mode inductor, the second common-mode inductor comprises a fifth winding, a sixth winding, a seventh winding, an eighth winding and a second magnetic core, wherein a first end of the fifth winding is connected to the second end of the first winding, a second end of the fifth winding is connected to the first connection point and the second connection point via the first inductor and the second inductor, a first end of the sixth winding is connected to the second end of the second winding, and a A second end is connected to the third connection point via the third inductor, a first end of the seventh winding is connected to the second end of the third winding, a second end of the seventh winding is connected to the fifth connection point, a first end of the eighth winding is connected to the second end of the fourth winding, a second end of the eighth winding is connected to the fourth connection point, and the fifth winding, the sixth winding, the seventh winding and the eighth winding are wound together on the second magnetic core, and the fifth winding and the eighth winding are coupled to each other, and the sixth winding and the seventh winding are coupled to each other.

23. The charge and discharge circuit as described in claim 22, wherein the EMI module further comprises a fifth capacitor and a sixth capacitor, the fifth capacitor is connected between the second end of the fifth winding and the second end of the eighth winding, and the sixth capacitor is connected between the second end of the sixth winding and the second end of the seventh winding.

24. The charge and discharge circuit as described in claim 22, wherein the charge and discharge circuit further comprises a first mechanical switch and a second mechanical switch, wherein the first end of the first mechanical switch is connected to a second end of the fifth winding, the first end of the second mechanical switch is connected to the second end of the sixth winding, and the second end of the first mechanical switch, the second end of the second mechanical switch and the third connection point of the third bridge arm are connected together.

25. The charging and discharging circuit as described in claim 24, wherein when the controller confirms according to the working mode that the charging energy of the first AC power of the first AC port is greater than or equal to the discharging energy of the second AC power of the second AC port, the second mechanical switch is controlled to be turned on, and the first mechanical switch is controlled to be turned off, the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the first DC power and provide the first DC power to the DC charging port, and the controller controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the second AC power and provide the second AC power to the second AC port.

26. The charging and discharging circuit of claim 24, wherein the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off when the controller confirms that the charging energy of the first AC power of the first AC port is less than the discharging energy of the second AC power of the second AC port according to the working mode, and the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm so that the power conversion module converts the first AC power of the first AC port into a second DC power, and the controller controls the third bridge arm and the fifth bridge arm so that the power conversion module converts the first DC power and the second DC power of the DC charging port into the second AC power, and provides the second AC power to the second AC port.

27. The charging and discharging circuit of claim 24, wherein when the controller controls the first AC port and the second AC port to be in the discharge mode, the controller controls the second mechanical switch to be turned on and controls the first mechanical switch to be turned off, and the controller controls the first bridge arm, the second bridge arm and the fourth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the first AC power and provide the first AC power to the first AC port, and the controller further controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the second AC power and provide the second AC power to the second AC port.

28. The charging and discharging circuit of claim 24, wherein the controller controls the second mechanical switch to be turned on and the first mechanical switch to be turned off according to the working mode, and the controller controls the third bridge arm and the fifth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the second AC power and provide the second AC power to the second AC port.

29. The charging and discharging circuit of claim 24, wherein the controller controls the first mechanical switch to be turned on and the second mechanical switch to be turned off according to the working mode, and the controller controls the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm to enable the power conversion module to convert the first DC power of the DC charging port into the first AC power and provide the first AC power to the first AC port.

30. The charging and discharging circuit of claim 24, wherein the controller controls the first mechanical switch to be turned on and controls the second mechanical switch to be turned off according to the working mode, and the controller controls the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm to enable the power conversion module to convert the first AC power of the first AC port into the first DC power and provide the first DC power to the DC charging port.

31. The charging and discharging circuit as claimed in claim 19, wherein the charging and discharging circuit also comprises a DC / DC conversion module connected between the power conversion module and the DC charging port.

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