Inverting and charging all-in-one machine circuit

Abstract

The utility model discloses an inversion and charging all-in-one machine circuit which comprises an alternating current input unit, an alternating current output unit, an input switching unit, an inversion unit and a direct current connection unit. The AC input unit is connected with the AC output unit and the inversion unit through the input switching unit, and the inversion unit is connected with the DC connection unit. The inverting and charging all-in-one machine circuit can be suitable for single-phase alternating current and double-phase alternating current, and is more flexible to use.

Description

Technical Field

[0001] The utility model relates to the field of inverter charging, in particular to an integrated inverter charging circuit. Background Art

[0002] An integrated inverter charger is a device that integrates the functions of charging and inverting. The integrated inverter charger can convert direct current into alternating current and store alternating current as direct current. The integrated inverter charger plays an important role in fields such as RVs and photovoltaic energy storage, which can improve the utilization efficiency of electric energy, reduce energy waste, and provide a convenient user experience.

[0003] Currently, there are two types of AC networks with different specifications in some regions (such as North America). One AC network uses single-phase alternating current (voltage is 120VAC), and the other AC network uses two-phase alternating current (voltage is 240VAC). However, the existing integrated inverter chargers can only be applied to one type of alternating current, which has great limitations in use.

[0004] In view of the above problems, it is necessary to study an integrated inverter charging circuit that can be applied to single-phase alternating current and two-phase alternating current. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an integrated inverter charging circuit that can be applied to single-phase alternating current and two-phase alternating current.

[0006] To achieve the above purpose, the solution of the utility model is:

[0007] An integrated inverter and charger circuit, which includes an AC input unit, an AC output unit, an input switching unit, an inverter unit, and a DC connection unit; the AC input unit includes a first live wire input port L1_IN, a second live wire input port L2_IN, and a neutral wire input port N_IN; the AC output unit includes a first live wire output port L1_OUT, a second live wire output port L1_OUT, and a neutral wire output port N_OUT; the input switching unit includes a first input switching switch S1, a second input switching switch S1, and a third input switching switch S3; the first switching end of the first input switching switch S1 is connected to the first live wire input port L1_IN, the first switching end of the second input switching switch S1 is connected to the second live wire input port L2_IN, and the first switching end of the third input switching switch S3 is connected to the neutral wire input port N_IN; the inverter unit includes a first bidirectional inverter module and a second bidirectional inverter module; the first AC end of the first bidirectional inverter module is connected to the second switching end of the first input switching switch S1 and the first live wire output port L1_OUT, and the second AC end of the first bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; the first AC end of the second bidirectional inverter module is connected to the second switching end of the second input switching switch S1 and the second live wire output port L1_OUT, and the second AC end of the second bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; the DC connection unit includes a positive connection port BAT+ and a negative connection port BAT-, the positive connection port BAT+ is connected to the DC positive extreme of the first bidirectional inverter module and the DC positive extreme of the second bidirectional inverter module, and the negative connection port BAT- is connected to the DC negative extreme of the first bidirectional inverter module and the DC negative extreme of the second bidirectional inverter module.

[0008] The first bidirectional inverter module includes a transformer T1, an inductor L1, MOS transistors Q1, Q2, Q3, and Q4. MOS transistors Q1, Q2, Q3, and Q4 are all NMOS transistors with body diodes; the two ends of the primary coil of the transformer T1 are respectively connected to the first AC end and the second AC end of the first bidirectional inverter module. The first end of the secondary coil of the transformer T1 is connected to the first end of the inductor L1. The second end of the inductor L1 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q2. The first end of the secondary coil of the transformer T2 is connected to the source of the MOS transistor Q3 and the drain of the MOS transistor Q4. The drain of the MOS transistor Q1 and the drain of the MOS transistor Q1 are connected to the DC positive extreme of the first bidirectional inverter module. The source of the MOS transistor Q3 and the source of the MOS transistor Q4 are connected to the DC negative extreme of the first bidirectional inverter module.

[0009] The first bidirectional inverter module further includes a capacitor C1; two ends of the capacitor C1 are respectively connected to the first AC terminal and the second AC terminal of the first bidirectional inverter module.

[0010] The first bidirectional inverter module further includes a capacitor Cb1; the positive electrode and the negative electrode of the capacitor Cb1 are respectively connected to the DC positive terminal and the DC negative terminal of the first bidirectional inverter module.

[0011] The second bidirectional inverter module includes a transformer T2, an inductor L2, MOS transistors Q5, Q6, Q7, and Q8, and the MOS transistors Q5, Q6, Q7, and Q8 are all NMOS transistors with body diodes; two ends of the primary coil of the transformer T2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module, a first end of the secondary coil of the transformer T2 is connected to a first end of the inductor L2, a second end of the inductor L2 is connected to the source electrode of the MOS transistor Q5 and the drain electrode of the MOS transistor Q6, a first end of the secondary coil of the transformer T2 is connected to the source electrode of the MOS transistor Q7 and the drain electrode of the MOS transistor Q8, the drain electrode of the MOS transistor Q5 and the drain electrode of the MOS transistor Q5 are connected to the DC positive terminal of the second bidirectional inverter module, and the source electrodes of the MOS transistor Q7 and the MOS transistor Q8 are connected to the DC negative terminal of the second bidirectional inverter module.

[0012] The second bidirectional inverter module further includes a capacitor C2; two ends of the capacitor C2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module.

[0013] The second bidirectional inverter module further includes a capacitor Cb2; the positive electrode and the negative electrode of the capacitor Cb2 are respectively connected to the DC positive terminal and the DC negative terminal of the second bidirectional inverter module.

[0014] The inverter and charger integrated circuit further includes an output switching unit; the output switching unit includes a first output switching switch K1, and a first switching end and a second switching end of the first output switching switch K1 are respectively connected to a first live wire output port L1_OUT and a second live wire output port L1_OUT.

[0015] The output switching unit further includes a second output switching switch K2, a first switching end of the second output switching switch K2 is connected to a neutral wire output port N_OUT, and a second switching end of the second output switching switch K2 is grounded.

[0016] The first input switching switch S1, the second input switching switch S1, the third input switching switch S3, the first output switching switch K1, and the second output switching switch K2 adopt electromagnetic relays, solid-state relays, switching tubes, or thyristors.

[0017] After adopting the above solution, the working principle of the present utility model is as follows:

[0018] When there is AC input at the first live wire input port L1_IN of the AC input unit of the present utility model and no AC input at the second live wire input port L2_IN (at this time, the present utility model is in the first working mode, and the AC input unit is connected to the first single-phase alternating current), control the first input changeover switch S1 and the third input changeover switch S3 to close; at this time, if the input current at the first live wire input port L1_IN is less than or equal to the maximum allowable input current, the first bidirectional inverter module works in the forward direction, so that the first single-phase alternating current connected by the AC input unit charges the battery pack connected to the DC connection unit through the first bidirectional inverter module. At the same time, the first single-phase alternating current connected by the AC input unit can supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit; and if the input current at the first live wire input port L1_IN is greater than the maximum allowable input current, the first bidirectional inverter module works in the reverse direction, and the battery pack connected to the DC connection unit is inverted through the first bidirectional inverter module to supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit, and at the same time, the first single-phase alternating current connected by the AC input unit also supplies power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit, thereby effectively improving the output load-carrying capacity;

[0019] When there is AC power input at the second live wire input port L2_IN of the AC input unit of the present utility model and no AC power input at the first live wire input port L1_IN (at this time, the present utility model is in the second working mode and the AC input unit is connected to the second single-phase alternating current), control the second input changeover switch S2 and the third input changeover switch S3 to close; at this time, if the input current at the second live wire input port L2_IN is less than or equal to the maximum allowable input current, the second bidirectional inverter module operates in the forward direction, so that the second single-phase alternating current connected by the AC input unit passes through the second bidirectional inverter module to charge the battery pack connected to the DC connection unit. At the same time, the second single-phase alternating current connected by the AC input unit can supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit; and if the input current at the second live wire input port L2_IN is greater than the maximum allowable input current, the second bidirectional inverter module operates in the reverse direction, and the battery pack connected to the DC connection unit is inverted through the second bidirectional inverter module to supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit. At the same time, the second single-phase alternating current connected by the AC input unit also supplies power to the first AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit, thereby effectively improving the output load-carrying capacity;

[0020] When there is AC input at both the first live wire input port L1_IN and the second live wire input port L2_IN of the AC input unit of the present utility model (at this time, the present utility model is in the third working mode, and the AC input unit is connected to a two-phase AC power supply), control the first input switching switch S1, the second input switching switch S2, and the third input switching switch S3 to close; at this time, if the input current of the first live wire input port L1_IN and the input current of the second live wire input port L2_IN are both less than or equal to the maximum allowable input current, both the first bidirectional inverter module and the second bidirectional inverter module work in the forward direction, so that the two-phase AC power supply connected to the AC input unit charges the battery pack connected to the DC connection unit through the first bidirectional inverter module and the second bidirectional inverter module. At the same time, the two-phase AC power supply connected to the AC input unit can supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit and the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT; if the input current of the first live wire input port L1_IN is greater than the maximum allowable input current, the first bidirectional inverter module works in the reverse direction, and the battery pack connected to the DC connection unit is inverted through the first bidirectional inverter module to supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit. At the same time, the two-phase AC power supply connected to the AC input unit also supplies power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit and the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT, thereby effectively improving the output load-carrying capacity; if the input current of the second live wire input port L2_IN is greater than the maximum allowable input current, the second bidirectional inverter module works in the reverse direction, and the battery pack connected to the DC connection unit is inverted through the second bidirectional inverter module to supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit. At the same time, the two-phase AC power supply connected to the AC input unit also supplies power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit and the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT, thereby effectively improving the output load-carrying capacity;

[0021] When there is no AC input at both the first live wire input port L1_IN and the second live wire input port L2_IN of the AC input unit of the present utility model (at this time, the present utility model is in the fourth working mode and the AC input unit is not connected to the AC power supply), control the first input switching switch S1, the second input switching switch S2, and the third input switching switch S3 to be disconnected; at this time, if both the first bidirectional inverter module and the second bidirectional inverter module are operating in the reverse direction, the battery pack connected by the DC connection unit is inverted through the first bidirectional inverter module and the second bidirectional inverter module to form a two-phase alternating current to supply power to the AC load connected to the AC output unit; and if only the first bidirectional inverter module is operating in the reverse direction, the battery pack connected by the DC connection unit is inverted through the first bidirectional inverter module to supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit; if only the second bidirectional inverter module is operating in the reverse direction, the battery pack connected by the DC connection unit is inverted through the second bidirectional inverter module to supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit.

[0022] As can be seen from the above, the inverter and charger integrated circuit of the present utility model can be applicable to single-phase alternating current and two-phase alternating current, and is more flexible in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the circuit schematic diagram of the present utility model. <{ DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail through specific embodiments below.

[0025] Such as Figure 1As shown in the figure, the present utility model discloses a circuit for an integrated inverter and charger, which includes an AC input unit, an AC output unit, an input switching unit, an inverter unit, and a DC connection unit; the AC input unit includes a first live wire input port L1_IN, a second live wire input port L2_IN, and a neutral wire input port N_IN, and the AC input unit is used for accessing alternating current; the AC output unit includes a first live wire output port L1_OUT, a second live wire output port L1_OUT, and a neutral wire output port N_OUT, and the AC output unit is used for outputting alternating current; the input switching unit includes a first input switching switch S1, a second input switching switch S1, and a third input switching switch S3; the first switching end of the first input switching switch S1 is connected to the first live wire input port L1_IN, the first switching end of the second input switching switch S1 is connected to the second live wire input port L2_IN, and the first switching end of the third input switching switch S3 is connected to the neutral wire input port N_IN; the inverter unit includes a first bidirectional inverter module and a second bidirectional inverter module; the first AC end of the first bidirectional inverter module is connected to the second switching end of the first input switching switch S1 and the first live wire output port L1_OUT, and the second AC end of the first bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; the first AC end of the second bidirectional inverter module is connected to the second switching end of the second input switching switch S1 and the second live wire output port L1_OUT, and the second AC end of the second bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; the DC connection unit includes a positive connection port BAT+ and a negative connection port BAT-, and the DC connection unit can be used to connect a battery pack. The positive connection port BAT+ is connected to the DC positive extreme of the first bidirectional inverter module and the DC positive extreme of the second bidirectional inverter module, and the negative connection port BAT- is connected to the DC negative extreme of the first bidirectional inverter module and the DC negative extreme of the second bidirectional inverter module.

[0026] The working principle of the present utility model is as follows:

[0027] When there is AC power input at the first live wire input port L1_IN of the AC input unit only and no AC power input at the second live wire input port L2_IN of the present utility model (at this time, the present utility model is in the first working mode, and the AC input unit is connected to the first single-phase AC power), control the first input changeover switch S1 and the third input changeover switch S3 to close; at this time, if the input current at the first live wire input port L1_IN is less than or equal to the maximum allowable input current, the first bidirectional inverter module works in the forward direction, so that the first single-phase AC power connected by the AC input unit passes through the first bidirectional inverter module to charge the battery pack connected by the DC connection unit. At the same time, the first single-phase AC power connected by the AC input unit can supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit; and if the input current at the first live wire input port L1_IN is greater than the maximum allowable input current, the first bidirectional inverter module works in the reverse direction, and the battery pack connected by the DC connection unit is inverted through the first bidirectional inverter module to supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit. At the same time, the first single-phase AC power connected by the AC input unit also supplies power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit, thereby effectively improving the output load-carrying capacity;

[0028] When there is AC power input at the second live wire input port L2_IN of the AC input unit only and no AC power input at the first live wire input port L1_IN of the present utility model (at this time, the present utility model is in the second working mode, and the AC input unit is connected to the second single-phase AC power), control the second input changeover switch S2 and the third input changeover switch S3 to close; at this time, if the input current at the second live wire input port L2_IN is less than or equal to the maximum allowable input current, the second bidirectional inverter module works in the forward direction, so that the second single-phase AC power connected by the AC input unit passes through the second bidirectional inverter module to charge the battery pack connected by the DC connection unit. At the same time, the second single-phase AC power connected by the AC input unit can supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit; and if the input current at the second live wire input port L2_IN is greater than the maximum allowable input current, the second bidirectional inverter module works in the reverse direction, and the battery pack connected by the DC connection unit is inverted through the second bidirectional inverter module to supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit. At the same time, the second single-phase AC power connected by the AC input unit also supplies power to the first AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit, thereby effectively improving the output load-carrying capacity;

[0029] When there is alternating current input at both the first live wire input port L1_IN and the second live wire input port L2_IN of the alternating current input unit of the present utility model (at this time, the present utility model is in the third working mode, and the alternating current input unit is connected to a two-phase alternating current), control the first input switching switch S1, the second input switching switch S2, and the third input switching switch S3 to close; at this time, if the input current of the first live wire input port L1_IN and the input current of the second live wire input port L2_IN are both less than or equal to the maximum allowable input current, both the first bidirectional inverter module and the second bidirectional inverter module work in the forward direction, so that the two-phase alternating current connected to the alternating current input unit charges the battery pack connected to the direct current connection unit through the first bidirectional inverter module and the second bidirectional inverter module. At the same time, the two-phase alternating current connected to the alternating current input unit can supply power to the first alternating current load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the alternating current output unit and the second alternating current load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT; if the input current of the first live wire input port L1_IN is greater than the maximum allowable input current, the first bidirectional inverter module works in the reverse direction, and the battery pack connected to the direct current connection unit is inverted through the first bidirectional inverter module to supply power to the first alternating current load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the alternating current output unit. At the same time, the two-phase alternating current connected to the alternating current input unit also supplies power to the first alternating current load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the alternating current output unit and the second alternating current load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT, thereby effectively improving the output load-carrying capacity; if the input current of the second live wire input port L2_IN is greater than the maximum allowable input current, the second bidirectional inverter module works in the reverse direction, and the battery pack connected to the direct current connection unit is inverted through the second bidirectional inverter module to supply power to the second alternating current load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the alternating current output unit. At the same time, the two-phase alternating current connected to the alternating current input unit also supplies power to the first alternating current load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the alternating current output unit and the second alternating current load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT, thereby effectively improving the output load-carrying capacity;

[0030] When there is no AC input at both the first live wire input port L1_IN and the second live wire input port L2_IN of the AC input unit of the present utility model (at this time, the present utility model is in the fourth working mode and the AC input unit is not connected to AC power), control the first input switching switch S1, the second input switching switch S2, and the third input switching switch S3 to be disconnected; at this time, if both the first bidirectional inverter module and the second bidirectional inverter module are operating in the reverse direction, the battery pack connected by the DC connection unit is inverted through the first bidirectional inverter module and the second bidirectional inverter module to form a two-phase alternating current to supply power to the AC load connected to the AC output unit; and if the first bidirectional inverter module operates alone in the reverse direction, the battery pack connected by the DC connection unit is inverted through the first bidirectional inverter module to supply power to the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit; if the second bidirectional inverter module operates alone in the reverse direction, the battery pack connected by the DC connection unit is inverted through the second bidirectional inverter module to supply power to the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT of the AC output unit.

[0031] In an embodiment of the present utility model, the first bidirectional inverter module may include a transformer T1, an inductor L1, MOS transistors Q1, Q2, Q3, and Q4, and MOS transistors Q1, Q2, Q3, and Q4 are all NMOS transistors with body diodes; wherein, both ends of the primary coil of the transformer T1 are respectively connected to the first AC terminal and the second AC terminal of the first bidirectional inverter module, the first end of the secondary coil of the transformer T1 is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q2, the first end of the secondary coil of the transformer T2 is connected to the source of the MOS transistor Q3 and the drain of the MOS transistor Q4, the drain of the MOS transistor Q1 and the drain of the MOS transistor Q1 are connected to the DC positive terminal of the first bidirectional inverter module, and the source of the MOS transistor Q3 and the source of the MOS transistor Q4 are connected to the DC negative terminal of the first bidirectional inverter module. The gates of the MOS transistors Q1, Q2, Q3, and Q4 are used to connect to a controller (such as a single-chip microcomputer). When the first bidirectional inverter module operates in the reverse direction, the controller controls the frequency and phase of the alternating current formed by the inversion of the first bidirectional inverter module through the on-off of the MOS transistors Q1, Q2, Q3, and Q4; when the first bidirectional inverter module operates in the forward direction, the body diodes of the MOS transistors Q1, Q2, Q3, and Q4 play a rectifying role.

[0032] In an embodiment of the present utility model, the first bidirectional inverter module further includes a capacitor C1; two ends of the capacitor C1 are respectively connected to the first AC terminal and the second AC terminal of the first bidirectional inverter module, and the capacitor C1 can play a filtering role.

[0033] In an embodiment of the present utility model, the first bidirectional inverter module further includes a capacitor Cb1; the positive electrode and the negative electrode of the capacitor Cb1 are respectively connected to the DC positive terminal and the DC negative terminal of the first bidirectional inverter module, and the capacitor Cb1 can also play a filtering role.

[0034] In an embodiment of the present utility model, the second bidirectional inverter module includes a transformer T2, an inductor L2, MOS transistors Q5, Q6, Q7, and Q8, and the MOS transistors Q5, Q6, Q7, and Q8 are all NMOS transistors with body diodes; wherein, two ends of the primary coil of the transformer T2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module, the first end of the secondary coil of the transformer T2 is connected to the first end of the inductor L2, the second end of the inductor L2 is connected to the source electrode of the MOS transistor Q5 and the drain electrode of the MOS transistor Q6, the first end of the secondary coil of the transformer T2 is connected to the source electrode of the MOS transistor Q7 and the drain electrode of the MOS transistor Q8, the drain electrode of the MOS transistor Q5 and the drain electrode of the MOS transistor Q5 are connected to the DC positive terminal of the second bidirectional inverter module, and the source electrodes of the MOS transistor Q7 and the MOS transistor Q8 are connected to the DC negative terminal of the second bidirectional inverter module. The gates of the MOS transistors Q5, Q6, Q7, and Q8 are used to be connected to a controller (such as a single-chip microcomputer). When the second bidirectional inverter module operates in the reverse direction, the controller controls the frequency and phase of the alternating current formed by the inversion of the second bidirectional inverter module through the on-off of the MOS transistors Q5, Q6, Q7, and Q8; when the second bidirectional inverter module operates in the forward direction, the body diodes of the MOS transistors Q5, Q6, Q7, and Q8 play a rectifying role.

[0035] In an embodiment of the present utility model, the second bidirectional inverter module further includes a capacitor C2; two ends of the capacitor C2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module, and the capacitor C2 plays a filtering role.

[0036] In an embodiment of the present utility model, the second bidirectional inverter module further includes a capacitor Cb2; the positive electrode and the negative electrode of the capacitor Cb2 are respectively connected to the DC positive terminal and the DC negative terminal of the second bidirectional inverter module, and the capacitor Cb2 plays a filtering role.

[0037] In an embodiment of the present utility model, the present utility model further includes an output switching unit; the output switching unit includes a first output switching switch K1 and a second output switching switch K2; a first switching end and a second switching end of the first output switching switch K1 are respectively connected to a first live wire output port L1_OUT and a second live wire output port L1_OUT, a first switching end of the second output switching switch K2 is connected to a neutral wire output port N_OUT, and a second switching end of the second output switching switch K2 is grounded. Among them, in the first working mode, the first output switching switch K1 can be controlled to close, so that the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit and the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT can be powered simultaneously. Similarly, in the second working mode, the first output switching switch K1 can also be controlled to close, so that the first AC load connected to the first live wire output port L1_OUT and the neutral wire output port N_OUT of the AC output unit and the second AC load connected to the second live wire output port L2_OUT and the neutral wire output port N_OUT can be powered simultaneously. In the third working mode and the fourth working mode, the first output switching switch K1 needs to be disconnected. In the fourth working mode, the second output switching switch K2 can be controlled to close to provide a loop for the rear-end leakage protection switch connected to the AC output unit.

[0038] In an embodiment of the present utility model, the first input switching switch S1, the second input switching switch S1, the third input switching switch S3, the first output switching switch K1 and the second output switching switch K2 can be controlled to be turned on and off by a controller. The first input switching switch S1, the second input switching switch S1, the third input switching switch S3, the first output switching switch K& and the second output switching switch K2 adopt electromagnetic relays, solid-state relays, switching tubes or thyristors.

[0039] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the technical field to which it belongs shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. An inverter charging integrated machine circuit, characterized in that: It includes an AC input unit, an AC output unit, an input switching unit, an inverter unit, and a DC connection unit; The AC input unit includes a first live wire input port L1_IN, a second live wire input port L2_IN, and a neutral wire input port N_IN; The AC output unit includes a first live wire output port L1_OUT, a second live wire output port L1_OUT, and a neutral wire output port N_OUT; The input switching unit includes a first input switching switch S1, a second input switching switch S1, and a third input switching switch S3; the first switching end of the first input switching switch S1 is connected to the first live wire input port L1_IN, the first switching end of the second input switching switch S1 is connected to the second live wire input port L2_IN, and the first switching end of the third input switching switch S3 is connected to the neutral wire input port N_IN; The inverter unit includes a first bidirectional inverter module and a second bidirectional inverter module; the first AC end of the first bidirectional inverter module is connected to the second switching end of the first input switching switch S1 and the first live wire output port L1_OUT, and the second AC end of the first bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; the first AC end of the second bidirectional inverter module is connected to the second switching end of the second input switching switch S1 and the second live wire output port L1_OUT, and the second AC end of the second bidirectional inverter module is connected to the second switching end of the third input switching switch S3 and the neutral wire output port N_OUT; The DC connection unit includes a positive connection port BAT+ and a negative connection port BAT-, the positive connection port BAT+ is connected to the DC positive ends of the first bidirectional inverter module and the second bidirectional inverter module, and the negative connection port BAT- is connected to the DC negative ends of the first bidirectional inverter module and the second bidirectional inverter module.

2. The integrated inverter and charger circuit according to claim 1, wherein: The first bidirectional inverter module includes a transformer T1, an inductor L1, MOS transistors Q1, Q2, Q3, and Q4, and MOS transistors Q1, Q2, Q3, and Q4 are all NMOS transistors with body diodes; The two ends of the primary coil of the transformer T1 are respectively connected to the first AC end and the second AC end of the first bidirectional inverter module. The first end of the secondary coil of the transformer T1 is connected to the first end of the inductor L1. The second end of the inductor L1 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q2. The first end of the secondary coil of the transformer T2 is connected to the source of the MOS transistor Q3 and the drain of the MOS transistor Q4. The drains of the MOS transistor Q1 and the MOS transistor Q1 are connected to the DC positive end of the first bidirectional inverter module. The sources of the MOS transistor Q3 and the MOS transistor Q4 are connected to the DC negative end of the first bidirectional inverter module.

3. The integrated inverter and charger circuit according to claim 2, wherein: The first bidirectional inverter module further includes a capacitor C1; the two ends of the capacitor C1 are respectively connected to the first AC end and the second AC end of the first bidirectional inverter module.

4. The integrated inverter and charger circuit according to claim 2, wherein: The first bidirectional inverter module further includes a capacitor Cb1; the positive and negative electrodes of the capacitor Cb1 are respectively connected to the DC positive terminal and the DC negative terminal of the first bidirectional inverter module.

5. The circuit of an inverter and charger integrated machine according to claim 1, characterized in that: The second bidirectional inverter module includes a transformer T2, an inductor L2, MOS transistors Q5, Q6, Q7, and Q8, and the MOS transistors Q5, Q6, Q7, and Q8 are all NMOS transistors with body diodes; The two ends of the primary coil of the transformer T2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module. The first end of the secondary coil of the transformer T2 is connected to the first end of the inductor L2. The second end of the inductor L2 is connected to the source of the MOS transistor Q5 and the drain of the MOS transistor Q6. The first end of the secondary coil of the transformer T2 is connected to the source of the MOS transistor Q7 and the drain of the MOS transistor Q8. The drain of the MOS transistor Q5 and the drain of the MOS transistor Q5 are connected to the DC positive terminal of the second bidirectional inverter module. The source of the MOS transistor Q7 and the source of the MOS transistor Q8 are connected to the DC negative terminal of the second bidirectional inverter module.

6. The inverter charging integrated machine circuit according to claim 5, wherein: The second bidirectional inverter module further includes a capacitor C2; the two ends of the capacitor C2 are respectively connected to the first AC terminal and the second AC terminal of the second bidirectional inverter module.

7. The circuit of an inverter and charger integrated machine according to claim 5, wherein: The second bidirectional inverter module further includes a capacitor Cb2; the positive and negative electrodes of the capacitor Cb2 are respectively connected to the DC positive terminal and the DC negative terminal of the second bidirectional inverter module.

8. The integrated inverter and charger circuit according to claim 1, wherein: It further includes an output switching unit; the output switching unit includes a first output switching switch K1, and the first switching end and the second switching end of the first output switching switch K1 are respectively connected to the first live wire output port L1_OUT and the second live wire output port L1_OUT.

9. The inverter charging integrated machine circuit according to claim 8, characterized in that: The output switching unit further includes a second output switching switch K2, the first switching end of the second output switching switch K2 is connected to the neutral wire output port N_OUT, and the second switching end of the second output switching switch K2 is grounded.

10. The integrated inverter and charger circuit according to claim 9, characterized in that: The first input switching switch S1, the second input switching switch S1, the third input switching switch S3, the first output switching switch K1, and the second output switching switch K2 are electromagnetic relays, solid-state relays, switching tubes, or thyristors.

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