A bidirectional ac-dc converter arrangement

Abstract

The application relates to the field of AC-DC converters, in particular to a bidirectional AC-DC converter device which comprises a converter body, the converter body is composed of power tube bridge arms, relay switching switches, inductors and capacitors and a controller, one end of the converter body is an AC-DC shared interface (AC_L / DC+, AC_N / DC-), the other end of the converter body is a DC bus interface (BUS+, BUS-). The bidirectional AC-DC converter device has the advantages that in AC-DC conversion, when the power is small, the converter only needs two bridge arms to work, when the power is large, three bridge arms of the converter work; in DC-DC conversion, when the power is small, the converter only needs one bridge arm to work, when the power is large, two bridge arms of the converter work; in the whole operation process, the bridge arms are realized to be staggered and connected in parallel through the logical control of the controller, the power and the charging and discharging speed are improved, the capacitor ripple current is reduced, the power device heat dissipation is improved, the efficiency and the power density are improved, and the volume and the cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of AC / DC converters, specifically a bidirectional AC / DC converter device. Background Technology

[0002] With the increasing popularity of new energy sources and the promotion and use of new energy vehicles, multiple energy sources are often used to form a common DC bus after being converted by power electronics. Similarly, high-voltage DC buses also require DC-DC conversion to low voltage for use or DC-AC inversion to AC to power AC equipment. Therefore, there is a certain market demand for power electronic devices that are compatible with both AC and DC applications and have bidirectional functions.

[0003] In addition, the application of new energy sources is not limited to electric vehicles and power grids, but also includes home energy storage and outdoor power supplies. Therefore, high efficiency, high power density, and low cost will be the focus of the power electronics field.

[0004] Traditional DC and AC applications consist of separate DC-DC converters and AC-DC converters, which are relatively large in size and costly. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a bidirectional AC / DC converter device.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a bidirectional AC / DC converter device, including a converter body, the converter body is composed of a power transistor bridge arm, a relay switching switch, an inductor, a capacitor and a controller, one end of the converter body is an AC / DC common interface (AC_L / DC+, AC_N / DC-), the other end of the converter body is a DC bus interface (BUS+, BUS-), the converter body includes S1, S2, S3, S4, S5 and S6 relay switches (or equivalent contactor switches), wherein S2 and S3 are a set of changeover relay switches, and the NC contact of S2 is connected to the NO contact of S3;

[0007] The converter body includes bridge arm A composed of Q1, D1, Q2, and D2; bridge arm B composed of Q3, D3, Q4, and D4; and bridge arm C composed of Q5, D5, Q6, and D6. The upper ends of bridge arms A, B, and C are all connected to the BUS+ interface, and the lower ends of bridge arms A, B, and C are all connected to the BUS- interface. The lower ends of bridge arm A and bridge arm B are connected through a set of switching relays S2. The COM contact of S2 is connected to the AC_N / DC- port, the NO contact of S2 is connected to the midpoint of bridge arm A, the NC contact of S2 is connected to the NO contact of a set of switching relays S3, the NC contact of S3 is connected to the lower end of bridge arm A, and the COM contact of S3 is connected to the lower end of bridge arm B (i.e., the BUS- network).

[0008] The switch S1 is connected to the AC_L / DC+ port and the common point of inductor L1 and capacitor C1; the switch S4 is connected to the AC_L / DC+ port and the common point of inductor L2 and capacitor C3; the switch S5 is connected to the AC_N / DC- port and the common point of bridge arm C and capacitor C3 (i.e., bus BUS-network); one end of the switch S6 is connected to capacitor C3, and the other end is connected to the common connection point of S4 and L2.

[0009] The controller consists of a data acquisition module, a relay switch driver module, a power transistor driver module, an auxiliary power supply, and a communication line.

[0010] The midpoint of bridge arm A is connected to the common point formed by one end of C1 and the NO contact of S2. The midpoint of bridge arm B is connected to one end of inductor L1, and the other end of inductor L1 is connected to the common point formed by the S1 contact and the other end of capacitor C1. The midpoint of bridge arm C is connected to one end of inductor L2, and the other end of inductor L2 is connected to the common point of S4 and S6. Capacitors C2 and C4 are connected to the BUS+ and BUS- networks, respectively. One end of capacitor C3 is connected to one end of S6, and the other end of C3 is connected to one end of S5 (i.e., the BUS- network). The inductance of inductors L1 and L2 is designed to be the same.

[0011] The capacitor C3, switch S6, inductor L2, bridge arm C, and capacitors C2 and C4 constitute a set of buckboost bidirectional DC-DC converters. The Q5 and Q6 drives are complementary, that is, they are 180 degrees out of phase.

[0012] The capacitor C3, switches S6, S4, S1, S2 (COM-NC), S3 (COM-NO), inductor L1, bridge arm B, and capacitors C2 and C4 constitute a set of buckboost bidirectional DC-DC converters. The Q3 and Q4 are driven by complementary forces, that is, they are 180 degrees out of phase.

[0013] The switches S1 and S2 (COM-NO), capacitor C1, inductor L1, switch S3 (COM-NC), bridge arm A, bridge arm B, capacitor C2, and capacitor C4 constitute a bidirectional AC-DC converter. Q1 and Q2 are driven complementaryly, i.e., their phases differ by 180 degrees; Q3 and Q4 are driven complementaryly, i.e., their phases differ by 180 degrees.

[0014] The switches S1, S2 (COM-NO), C1, S4, L2, S3 (COM-NC), bridge arm A, bridge arm C, C2, and C4 constitute a bidirectional AC-DC converter. Q1 and Q2 are driven complementaryly, i.e., their phases differ by 180 degrees; Q5 and Q6 are driven complementaryly, i.e., their phases differ by 180 degrees.

[0015] The capacitor C3, switch S6, inductor L2, bridge arm C, capacitor C2, C4, switch S4, switch S1, switch S2 (COM-NC), switch S3 (COM-NO), inductor L1, and bridge arm B constitute a set of interleaved parallel bidirectional buckboost converters. The driving phases of Q5 and Q6 are 180 degrees apart, the driving phases of Q3 and Q4 are 180 degrees apart, and the carrier phases of Q3 and Q5 are 180 degrees apart.

[0016] The switches S1, S2 (COM-NO), C1, L1, S3 (COM-NC), bridge arm A, bridge arm B, S4, L2, C, C2, and C4 form an interleaved parallel bidirectional AC-DC converter. The driving phases of Q1 and Q2 are 180 degrees apart, the driving phases of Q5 and Q6 are 180 degrees apart, the driving phases of Q3 and Q4 are 180 degrees apart, and the carrier phases of Q3 and Q5 are 180 degrees apart.

[0017] The controller controls the operating status of the bidirectional AC / DC converter by collecting AC / DC port voltage, DC bus voltage, capacitor voltage, inductor current, and receiving commands from the host computer.

[0018] The beneficial effects of this invention are:

[0019] The present invention discloses a bidirectional AC / DC converter device. For AC-DC conversion, only two bridge arms of the converter operate when the power is low, while all three bridge arms operate when the power is high. For DC-DC conversion, only one bridge arm of the converter operates when the power is low, while both bridge arms operate when the power is high. Throughout the operation, the controller's logic control enables the bridge arms to be interleaved and connected in parallel, thereby increasing power and charging / discharging speed, reducing capacitor ripple current, and improving heat dissipation of power devices, thus improving efficiency and power density while reducing size and cost. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This invention provides a schematic diagram of the main power circuit structure of a bidirectional AC / DC converter device.

[0022] Figure 2 A schematic diagram of the controller structure of a bidirectional AC / DC converter device provided by the present invention;

[0023] Figure 3 A schematic diagram of a set of Buckboost bidirectional converter structures is provided by the present invention for a bidirectional AC / DC converter device;

[0024] Figure 4 A schematic diagram of a set of Buckboost bidirectional converter structures is provided by the present invention for a bidirectional AC / DC converter device;

[0025] Figure 5 A schematic diagram of two sets of Buckboost bidirectional converters interleaved in parallel for a bidirectional AC / DC converter device provided by the present invention;

[0026] Figure 6 A schematic diagram of a bidirectional AC-DC converter structure is provided for this invention.

[0027] Figure 7 This invention provides a schematic diagram of the bidirectional AC / DC converter with an interleaved parallel structure. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0029] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0030] like Figure 1 The present invention provides a bidirectional AC / DC converter device, comprising relay switches S1, S2, S3, S4, S5, and S6; switching transistors Q1, Q2, Q3, Q4, Q5, and Q6; switching transistors D1, D2, D3, D4, D5, and D6; capacitors C1, C2, C3, and C4; inductors L1 and L2; bridge arm A composed of Q1, D1, Q2, and D2; bridge arm B composed of Q3, D3, Q4, and D4; and bridge arm C composed of Q5, D5, Q6, and D6; AC_L / DC+ and AC_N / DC- are common AC / DC ports; and BUS+ and BUS- are high-voltage DC bus ports of the converter; the inductance of inductors L1 and L2 is designed to be the same.

[0031] The lower ends of bridge arm A and bridge arm B are connected by a set of changeover relays S2. The COM contact of S2 is connected to the AC_N / DC- port, the NO contact of S2 is connected to the midpoint of bridge arm A, the NC contact of S2 is connected to the NO contact of a set of changeover relays S3, the NC contact of S3 is connected to the lower end of bridge arm A, and the COM contact of S3 is connected to the lower end of bridge arm B (i.e., BUS-network).

[0032] Switch S1 is connected to the AC_L / DC+ port and the common point of inductor L1 and capacitor C1. Switch S4 is connected to the AC_L / DC+ port and the common point of inductor L2 and capacitor C3. Switch S5 is connected to the AC_N / DC- port and the common point of bridge arm C and capacitor C3 (i.e., bus BUS-network). One end of switch S6 is connected to capacitor C3, and the other end is connected to the common connection point of S4 and L2.

[0033] The controller consists of a data acquisition module, a relay switch driver module, a power transistor driver module, an auxiliary power supply, and communication lines.

[0034] Initial state of the relays: S1, S4, S5, and S6 are normally open; S2 and S3 are a set of changeover relays. The normally closed contact (NC) of S2 is connected to the normally open contact (NO) of S3. The normally open contact (NO) of S2 is connected to C1 and the midpoint of bridge arm A. The normally closed contact (NC) of S3 connects the lower end of bridge arm A to the lower end of bridge arm B (i.e., busbar BUS-).

[0035] The controller controls the operating status of the AC / DC converter by acquiring AC / DC port voltages, DC bus voltages, capacitor voltages, inductor currents, and receiving commands from the host computer. Vac / dc is the AC / DC port voltage; Vc1 and Vc3 are the voltages of capacitors C1 and C3, respectively; Vbus is the bus voltage; iL1 and iL2 are the currents of inductors L1 and L2, respectively; Vgs1, Vgs2, Vgs3, Vgs4, Vgs5, and Vgs6 are the drivers for Q1, Q2, Q3, Q4, Q5, and Q6, respectively; and Vdrv_s1, Vdrv_s2, Vdrv_s3, Vdrv_s4, Vdrv_s5, and Vdrv_s6 are the drivers for relays S1, S2, S3, S4, S5, and S6, respectively.

[0036] Example 1, as Figure 3 and Figure 4 Show:

[0037] DC+ and DC- are used as inputs, and BUS+ and BUS- are used as outputs, meaning that the DC side performs boost conversion to the BUS side.

[0038] Switches S4, S5, and S6 are closed, S1 is open, and S2 and S3 remain in their initial states, as follows: Figure 3 As shown, L2, C2, C3, C4, and bridge arm C constitute a BuckBoost bidirectional converter. Alternatively, close S1, S4, and S6, close the NO contact of S3, open S5, and keep S2 in its initial state, as shown. Figure 4 As shown, L1, C2, C3, C4, and bridge arm B also constitute a BuckBoost bidirectional converter. During boost conversion, only [the following components] can be selected. Figure 3 or Figure 4 The circuit unit performs power conversion. Figure 3 To explain, when Q6 is turned on, L2 stores energy. After Q6 is turned off, the energy from L2 charges capacitors C2 and C4 through D5 or Q5 (Q5 can operate in synchronous rectification mode), thus boosting the voltage of the bus. When Q5 operates in synchronous rectification mode, the driving phases of Q5 and Q6 are 180 degrees out of phase.

[0039] Example 2, as Figure 5 Show:

[0040] DC+ and DC- are used as inputs, and BUS+ and BUS- are used as outputs, meaning that the DC side performs boost conversion to the BUS side.

[0041] With S1 closed, S2 remains in its initial state, the normally open contact (NO) of S3 closed, and S4, S5, and S6 closed. This means that bridge arms B and C form two sets of BuckBoost bidirectional converters connected in alternating parallel configurations, which reduces the ripple current of capacitors C3, C2, and C4. The carrier signals of Q6 and Q4 are 180 degrees out of phase. When Q5 operates in synchronous rectification mode, the driving phases of Q5 and Q6 are 180 degrees out of phase. When Q3 operates in synchronous rectification mode, the driving phases of Q3 and Q4 are 180 degrees out of phase.

[0042] Example 3, as Figure 3 and Figure 4 Show:

[0043] Using BUS+ and BUS- as inputs, and DC+ and DC- as outputs, this circuit performs a step-down conversion from the BUS side to the DC side. The working circuit is as follows: Figure 4 As shown,

[0044] by Figure 3 To explain, when Q5 is turned on, the BUS simultaneously charges the DC-side capacitor C3 and L2. After Q5 is turned off, the energy from L2 continues to charge C3 through D6 or Q6 (Q6 can operate in synchronous rectification mode), thus stepping down the BUS voltage. When Q6 operates in synchronous rectification mode, the driving phases of Q6 and Q5 are 180 degrees out of phase.

[0045] Example 4, as Figure 5 Show:

[0046] Using BUS+ and BUS- as inputs, and DC+ and DC- as outputs, this circuit performs a step-down conversion from the BUS side to the DC side. The working circuit is as follows: Figure 5 As shown,

[0047] When transistor Q5 is turned on, the BUS simultaneously charges DC-side capacitor C3 and L2. After Q5 is turned off, the energy from L2 continues to charge C3 through freewheeling current from D6 or Q6 (Q6 can operate in synchronous rectification mode). When transistor Q3 is turned on, the BUS simultaneously charges DC-side capacitor C3 and L1. After Q3 is turned off, the energy from L1 continues to charge C3 through freewheeling current from D4 or Q4 (Q4 can operate in synchronous rectification mode). The carrier signals of Q5 and Q3 are 180 degrees out of phase. When Q6 operates in synchronous rectification mode, the driving phases of Q5 and Q6 are 180 degrees out of phase. When Q4 operates in synchronous rectification mode, the driving phases of Q3 and Q4 are 180 degrees out of phase.

[0048] Example 5, as Figure 6 Show:

[0049] AC_L and AC_N are used as AC inputs, and BUS+ and BUS- are used as DC outputs.

[0050] When switch S1 is closed, the normally open contact (NO) of S2 is closed, and switches S4, S5, and S6 are open. Figure 6 As shown, C1, L1, bridge arm A, bridge arm B, C2, and C4 constitute a bidirectional AC-DC converter. Power transistors Q1 and Q2 in bridge arm A are switched at power frequency, while power transistors Q3 and Q4 in bridge arm B are switched at high frequency.

[0051] During the positive half-cycle of the input AC, Q2 is normally on, Q1 is normally off, and Q4 is on. The current AC charges the inductor L1 through the path of L1, Q4, and Q2. When Q4 is off, the current in the inductor L1 charges the bus capacitors C2 and C4 through D3 and Q3.

[0052] During the negative half-cycle of the input AC, Q1 is normally on, Q2 is normally off, and when Q3 is on, the AC charges L1 through the circuit of Q1, Q3, and L1. When Q3 is off, the inductor L1 charges the bus capacitors C2 and C4 through Q4 and D4.

[0053] Q1 and Q2 are driven by a phase difference of 180 degrees, and Q3 and Q4 are driven by a phase difference of 180 degrees.

[0054] Example 6, as Figure 7 Show:

[0055] AC_L and AC_N are used as AC inputs, and BUS+ and BUS- are used as DC outputs.

[0056] When switch S1 is closed, the normally open contact (NO) of S2 is closed, S3 remains in its initial state, switch S4 is closed, and S5 and S6 are open. Figure 7 As shown, bridge arms A, B, and C work together to achieve AC-DC conversion, with bridge arms B and C operating in an alternating parallel configuration. The overall operation is similar to that in Example 5.

[0057] Q1 and Q2 are driven by a phase difference of 180 degrees, Q3 and Q4 are driven by a phase difference of 180 degrees, Q5 and Q6 are driven by a phase difference of 180 degrees, and the carriers of Q4 and Q6 are also driven by a phase difference of 180 degrees.

[0058] Example 7, as Figure 6 Show:

[0059] BUS+ and BUS- serve as DC inputs, while AC_L and AC_N serve as AC outputs. The operating circuit is as follows: Figure 6 As shown, during the positive half-cycle of AC, Q2 is normally on, Q1 is normally off, and Q3 is on. The DC bus charges inductor L1 through the path of Q3, L1, C1, and Q2. When Q3 is off, the current in inductor L1 freewheels through D4 (or Q4), L1, C1, and Q2.

[0060] During the negative half-cycle of AC, Q1 is normally on, Q2 is normally off, and Q4 is on. The DC bus charges inductor L1 through the path Q1, C1, L1, and Q4. When Q4 is off, the current in inductor L1 freewheels through the path D3 (or Q3), Q1, C1, and L1.

[0061] Q1 and Q2 are driven by a phase difference of 180 degrees, and Q3 and Q4 are driven by a phase difference of 180 degrees.

[0062] Example 8, as Figure 7 Show:

[0063] BUS+ and BUS- serve as DC inputs, while AC_L and AC_N serve as AC outputs. The operating circuit is as follows: Figure 7 As shown, the overall operation is similar to that of Example 7. Q1 and Q2 are driven by a phase difference of 180 degrees, Q3 and Q4 are driven by a phase difference of 180 degrees, Q5 and Q6 are driven by a phase difference of 180 degrees, and the carriers of Q3 and Q5 are also driven by a phase difference of 180 degrees.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A bidirectional AC / DC converter device, characterized in that: The converter body comprises a power transistor bridge arm, relay switching components, inductors, capacitors, and a controller. One end of the converter body is a shared AC / DC interface, namely the AC_L / DC+ port and the AC_N / DC- port; the other end of the converter body is a DC bus interface, namely the BUS+ port and the BUS- port. The converter body contains six relay switches: S1, S2, S3, S4, S5, and S6. Among them, S2 and S3 are a set of changeover relay switches, and the NC contact of S2 is connected to the NO contact of S3. The converter body includes inductors L1 and L2, and capacitors C1, C2, C3, and C4. The converter body includes bridge arm A composed of Q1, D1, Q2, and D2; bridge arm B composed of Q3, D3, Q4, and D4; and bridge arm C composed of Q5, D5, Q6, and D6. The upper ends of bridge arms A, B, and C are all connected to the BUS+ interface, and the lower ends of bridge arms A, B, and C are all connected to the BUS- interface. The lower ends of bridge arm A and bridge arm B are connected through a set of switching relays S2. The COM contact of S2 is connected to the AC_N / DC- port, the NO contact of S2 is connected to the midpoint of bridge arm A, the NC contact of S2 is connected to the NO contact of a set of switching relays S3, the NC contact of S3 is connected to the lower end of bridge arm A, and the COM contact of S3 is connected to the lower end of bridge arm B, i.e., connected to the BUS- network. The first terminal of switch S1 is connected to the AC_L / DC+ port, and the second terminal of switch S1 is connected to both the first terminal of inductor L1 and the first terminal of capacitor C1; the second terminal of inductor L1 is connected to the midpoint of bridge arm B; and the second terminal of capacitor C1 is connected to the midpoint of bridge arm A. The first terminal of switch S4 is connected to the AC_L / DC+ port, and the second terminal of switch S4 is connected to both the first terminal of inductor L2 and the second terminal of switch S6; the second terminal of inductor L2 is connected to the midpoint of bridge arm C. The first end of the switch S5 is connected to the AC_N / DC port, and the second end of the switch S5 is connected to both the first end of the capacitor C3 and the lower end of the bridge arm C. The lower end of the bridge arm C is connected to the BUS network. The first end of the switch S6 is connected to the second end of the capacitor C3, and the second end of the switch S6 is connected to the common point between the second end of the switch S4 and the first end of the inductor L2. The first end of capacitor C2 and the first end of capacitor C4 are connected to the BUS+ interface / network, and the second end of capacitor C2 and the second end of capacitor C4 are connected to the BUS- interface / network. The controller consists of a data acquisition module, a relay switch driver module, a power transistor driver module, an auxiliary power supply, and a communication line.

2. The bidirectional AC / DC converter device according to claim 1, characterized in that: The midpoint of bridge arm A is connected to the common point formed by the second terminal of capacitor C1 and the NO contact of S2. The midpoint of bridge arm B is connected to the second terminal of inductor L1. The first terminal of inductor L1 is connected to the common point formed by the second terminal of S1 and the first terminal of capacitor C1. The midpoint of bridge arm C is connected to the second terminal of inductor L2. The first terminal of inductor L2 is connected to the common point of the second terminals of S4 and S6. Capacitors C2 and C4 are connected between the BUS+ network and the BUS- network. The second terminal of capacitor C3 is connected to the first terminal of S6. The first terminal of capacitor C3 is connected to the second terminal of S5, i.e., the BUS- network. The inductance of inductors L1 and L2 is designed to be the same.

3. The bidirectional AC / DC converter device according to claim 2, characterized in that: The capacitor C3, switch S6, inductor L2, bridge arm C, and capacitors C2 and C4 constitute a set of buckboost bidirectional DC-DC converters. The Q5 and Q6 drives are complementary, that is, they are 180 degrees out of phase.

4. A bidirectional AC / DC converter device according to claim 2, characterized in that: The capacitor C3, switches S6, S4, S1, the NC contact of switch S2, the NO contact of switch S3, inductor L1, bridge arm B, and capacitors C2 and C4 constitute a set of buckboost bidirectional DC-DC converters. The Q3 and Q4 drives are complementary, that is, they are 180 degrees out of phase.

5. A bidirectional AC / DC converter device according to claim 2, characterized in that: The NO contacts of switches S1 and S2, capacitor C1, inductor L1, NC contacts of switch S3, bridge arm A, bridge arm B, capacitor C2, and capacitor C4 constitute a bidirectional AC-DC converter. Q1 and Q2 are complementary drivers, that is, they are 180 degrees out of phase. Q3 and Q4 drive each other complementaryly, meaning they are 180 degrees out of phase.

6. A bidirectional AC / DC converter device according to claim 2, characterized in that: The NO contacts of switches S1 and S2, capacitor C1, switch S4, inductor L2, NC contacts of switch S3, bridge arm A, bridge arm C, capacitor C2, and capacitor C4 constitute a bidirectional AC-DC converter. Q1 and Q2 are complementary drivers, that is, they are 180 degrees out of phase. Q5 and Q6 drive each other complementaryly, meaning they are 180 degrees out of phase.

7. A bidirectional AC / DC converter device according to any one of claims 1 to 4, characterized in that: The capacitor C3, switch S6, inductor L2, bridge arm C, capacitors C2 and C4, switches S4, S1, the NC contact of switch S2, the NO contact of switch S3, inductor L1, and bridge arm B constitute a set of interleaved parallel bidirectional buckboost converters. The driving phases of Q5 and Q6 are 180 degrees apart, the driving phases of Q3 and Q4 are 180 degrees apart, and the carrier phases of Q3 and Q5 are 180 degrees apart.

8. A bidirectional AC / DC converter device according to claim 5 or 6, characterized in that: The switch S1, the NO contact of switch S2, capacitor C1, inductor L1, the NC contact of switch S3, bridge arm A, bridge arm B, switch S4, inductor L2, bridge arm C, capacitor C2, and capacitor C4 constitute a set of interleaved parallel bidirectional AC-DC converters. The driving phases of Q1 and Q2 are 180 degrees apart, the driving phases of Q5 and Q6 are 180 degrees apart, the driving phases of Q3 and Q4 are 180 degrees apart, and the carrier phases of Q3 and Q5 are 180 degrees apart.

9. A bidirectional AC / DC converter device according to claim 1, characterized in that: The controller controls the operating status of the bidirectional AC / DC converter by collecting AC / DC port voltage, DC bus voltage, capacitor voltage, inductor current, and receiving commands from the host computer.

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