Multi-phase inversion output method and device based on multi-source input

Abstract

The invention discloses a multi-phase inverter output method and device based on multi-source input, and is suitable for a dual-active bridge converter. The output port of the dual-active bridge converter is electrically connected with the alternating current input interface; the multi-phase inverter output method comprises the following steps: controlling a dual-active bridge converter to construct a transformation channel from a first power supply to an output port; in response to an output demand of a second power supply, constructing a power supply input channel from the second power supply to the dual-active bridge converter; according to the voltage transformation channel and the power supply input channel, controlling the dual-active bridge converter to carry out voltage transformation on the obtained input power supply so as to output a stable power supply; and constructing an inversion output channel from the output port to the alternating current input interface to control the inversion output channel to perform inversion conversion on a stable power supply, and outputting the converted stable power supply to the alternating current input interface, thereby reducing the circuit complexity of converting multiple paths of direct current input.

Description

Technical Field

[0001] The present invention relates to the technical field of inverters, and specifically, to a multi-phase inverter output method and device based on multi-source input. Background Art

[0002] With the attenuation of traditional energy, electric energy has been gradually emphasized. In order to expand the application fields of electric energy, bidirectional DC-AC converters, which can convert both direct current and alternating current, have been widely used in various fields such as DC microgrids, transportation electrification, and data center power supply systems.

[0003] The DC / AC converters used in the prior art can only achieve single-channel DC input, that is, they can only obtain the DC input of a single power source and perform output. For application scenarios that require multi-source DC input, multiple DC / AC converters need to be used in parallel, that is, a separate converter needs to be equipped for each DC input to achieve multi-source DC inverter output. The above method for multi-channel inverter output requires a multiple increase in the number of circuit components according to the number of DC inputs, greatly increasing the complexity of the circuit. Summary of the Invention

[0004] To solve the above technical problems, the present invention discloses a multi-phase inverter output and device based on multi-source input, which is used to reduce the circuit complexity when performing inverter output on multi-channel DC input.

[0005] To achieve the above object, the present invention discloses a multi-phase inverter output method based on multi-source input, which is applicable to a dual-active bridge converter; the output port of the dual-active bridge converter is electrically connected to an AC input interface; wherein, the multi-phase inverter output method includes:

[0006] Controlling the dual-active bridge converter to construct a voltage transformation channel from a first power source to the output port of the dual-active bridge converter;

[0007] Responding to the output demand of a second power source, constructing a power input channel from the second power source to the dual-active bridge converter;

[0008] According to the voltage transformation channel and the power input channel, controlling the dual-active bridge converter to transform the input power source obtained by the dual-active bridge converter to output a stable power source;

[0009] Constructing an inverter output channel from the output port to the AC input interface, and controlling the inverter output channel to perform inverter conversion on the stable power source according to the voltage required by the AC input interface, and controlling the inverter output channel to output the converted stable power source to the AC input interface.

[0010] The present invention discloses a multi-phase inverter output method based on multi-source input, which replaces the isolation of the transformer based on the interleaved voltage conversion circuit of the dual-active bridge converter, and can reduce the circuit difficulty required for DC inverter output. Furthermore, when performing DC inverter output, the dual-active bridge converter is first controlled to form a voltage conversion channel when the first power source performs inverter output. Then, on the basis of the voltage conversion channel, the second power source and the power input channel of the dual-active bridge converter are constructed, so as to use the power input channel to realize the conversion of multiple DC inputs by a single-channel dual-active bridge converter, and then perform inverter conversion according to the inverter output channel connected to the output port, thereby reducing the number of devices required for inverter conversion of multiple DCs, thereby reducing the circuit difficulty.

[0011] As a preferred example, the step of constructing a voltage conversion channel from the first power source to the output port of the dual-active bridge converter includes:

[0012] Complementary control is performed on the switch tubes in the dual-active bridge converter; wherein the complementary control is to control different switch tubes on the same bridge arm to be turned on at different times;

[0013] A voltage transformation channel from the first power supply to the output port of the dual active bridge converter is constructed based on the complementary control; wherein the output port of the first power supply is electrically connected to the input port of the dual active bridge converter.

[0014] In the above scheme, the power transmission direction is controlled by complementary control of the switch tubes in the dual active bridge converter. The complementary control of the switch tubes is used to achieve the voltage conversion of the first power supply, thereby adapting to power supplies with different powers, without the need to configure converters with different power conversion for different power supplies, thereby reducing the complexity of the circuit.

[0015] As a preferred example, the input power source includes the first power source and the second power source; the controlling the dual-active bridge converter to transform the input power source obtained by the dual-active bridge converter according to the voltage transformation channel and the power input channel to output a stable power source includes:

[0016] Acquire electrical quantities of the output port of the dual active bridge converter; wherein the electrical quantities include voltage and current;

[0017] The duty cycle of the switch tube in the dual-active bridge converter is adjusted according to the electrical quantity to control the dual-active bridge converter to adjust the bandwidth of the input power obtained by the dual-active bridge converter and output the stable power supply.

[0018] In the above solution, by controlling the duty cycle of the switching tubes in the dual-active-bridge converter, the power conversion of the dual-active-bridge converter is changed, so as to realize different power outputs, reduce the number of devices used for power conversion, and further reduce the complexity of the circuit.

[0019] As a preferred example, constructing an inverter output channel from the output port to the AC input interface to convert the stable power supply according to the voltage required by the inverter output channel and the AC input interface, and outputting the converted stable power supply to the AC input interface includes:

[0020] Obtaining the voltage required by the AC input interface, and adjusting the duty cycle of the switching tubes in the inverter output channel according to the voltage;

[0021] Controlling the inverter output channel to adjust the frequency bandwidth of the stable power supply obtained by the inverter output channel according to the adjusted duty cycle, so as to output a converted stable power supply with a frequency bandwidth consistent with the voltage required by the AC input interface.

[0022] In the above solution, by controlling the duty cycle of the switching tubes in the inverter output channel, the DC output by the dual-active-bridge converter is converted into the alternating current required by the AC input interface, so as to realize the inverter output of DC.

[0023] On the other hand, the present invention discloses a multi-phase inverter output device based on multi-source input, which is characterized by including a dual-active-bridge converter, a controller, a power supply switching switch circuit, and an inverter output circuit;

[0024] Wherein, the input end of the power supply switching switch circuit is electrically connected to the first end of the second power supply; the output end of the power supply switching switch circuit and the input end of the first power supply are respectively electrically connected to the input port of the dual-active-bridge converter; the output port of the dual-active-bridge converter is electrically connected to the input end of the inverter output circuit; the output end of the inverter output circuit is electrically connected to the AC input interface;

[0025] Wherein, the dual-active-bridge converter is signal-connected to the controller, so that the controller controls the dual-active-bridge converter to construct a voltage conversion channel between the output port of the dual-active-bridge converter and the first power supply;

[0026] The power supply switching switch circuit is signal-connected to the controller, so that the controller controls the power supply switching switch circuit in response to the output demand of the second power supply to construct a power input channel between the second power supply and the dual-active-bridge converter; wherein, the power supply switching switch circuit corresponds to the second power supply one by one;

[0027] The controller controls the dual-active-bridge converter to step down the input power supply obtained by the dual-active-bridge converter according to the step-down channel and the power input channel, so as to output a stable power supply to the inverter output circuit;

[0028] The inverter output circuit is signal-connected to the controller, so that the controller controls the inverter output circuit to construct an inverter output channel from the output port to the AC input interface, and controls the inverter output circuit to perform an inverter conversion on the stable power supply according to the voltage required by the AC input interface, and controls the inverter output channel to output the converted stable power supply to the AC input interface.

[0029] A multi-phase inverter output device based on multi-source input disclosed by the present invention, when realizing the inverter output of multiple DC inputs, first sets a dual-active-bridge converter to be connected to a power supply and an inverter output circuit respectively, so as to realize the bidirectional flow of energy and the inverter output of DC through the dual-active-bridge converter and the inverter output circuit, thereby reducing the number of devices required for the inverter output during the bidirectional flow of energy. Further, a plurality of power switch circuits having the same number as the second power supply in the power supply are connected in series at the first end of the dual-active-bridge converter, so as to serially connect additional DC inputs to the originally existing dual-active-bridge converter through the power switch circuits, thereby realizing the conversion of multiple DC inputs through one dual-active-bridge converter and the power switch circuits, reducing the number of devices required for DC conversion, and further reducing the complexity of the circuit.

[0030] As a preferred example, the power switch circuit includes a first switch tube and a second switch tube;

[0031] Wherein, the source of the first switch tube is connected to the output end of the second power supply; the drain of the first switch tube is connected to the first input end of the dual-active-bridge converter;

[0032] The drain of the second switch tube is connected to the output end of the second power supply, and the source of the second switch tube is connected to the second input end of the dual-active-bridge converter; wherein, the input end of the dual-active-bridge converter includes a first input end and a second input end.

[0033] In the above solution, in order to respond to the DC input of each of the second power supplies, a first switch tube and a second switch tube for reverse transmission are provided in each of the power switch circuits, wherein the source of the first switch tube is connected to the first end of the second power supply, and the drain of the second switch tube is connected to the first end of the second power supply. When receiving the DC input of the second power supply, the complementary control of the first power supply and the second power supply can be performed to realize the DC input of multiple sources.

[0034] As a preferred example, the power supply switching switch circuit further includes a first inductor and a second inductor;

[0035] Wherein, the first end of the first inductor is connected to the drain of the first switching transistor; the second end of the first inductor is connected to the first input terminal of the dual-active bridge converter;

[0036] The first end of the second inductor is connected to the source of the second switching transistor; the second end of the second inductor is connected to the second input terminal of the dual-active bridge converter.

[0037] In the above solution, an inductor is connected in series between different switching transistors in the power supply switching switch circuit to process the direct current output by the second power supply through the inductor, and charge the first power supply based on the conduction state of the first switching transistor.

[0038] As a preferred example, the inverter output circuit includes a plurality of single-phase inverter circuits; wherein, each single-phase inverter circuit includes a third switching transistor, a fourth switching transistor, a load and a third inductor;

[0039] Wherein, the drain of the third switching transistor, the source of the fourth switching transistor are electrically connected to the output port of the dual-active converter;

[0040] The source of the third switching transistor, the drain of the fourth switching transistor are electrically connected to the first end of the load;

[0041] The second end of the load is electrically connected to the first end of the third inductor; the second end of the third inductor is electrically connected to the AC input interface.

[0042] In the above solution, the drain of the third switching transistor and the source of the fourth switching transistor are electrically connected to the output port of the dual-active converter to perform complementary control on the third switching transistor and the fourth switching transistor, thereby controlling the energy flow direction, and the load and the inductor are provided to perform inverter conversion according to the voltage required by the AC input interface to achieve the inverter output of direct current.

[0043] As a preferred example, the controller controls the dual-active bridge converter to transform the input power obtained by the dual-active bridge converter according to the voltage transformation channel and the power input channel, so as to output a stable power supply to the inverter output circuit, including:

[0044] The controller performs complementary control on the switching transistors in the dual-active bridge converter to construct a voltage transformation channel from the first power supply to the output port of the dual-active bridge converter;

[0045] The controller performs complementary control on the first switch tube and the second switch tube in the power supply switching switch circuit to construct a power input channel for the second power supply and the dual-active bridge converter;

[0046] The controller adjusts the duty cycle of the switch tubes in the dual-active bridge converter to control the dual-active bridge converter to perform frequency bandwidth conversion on the input power supply it obtains, so as to output a stable power supply to the inverter output circuit; wherein, the input power supply includes the first power supply and the second power supply.

[0047] In the above solution, by controlling the duty cycle of the switch tubes in the dual-active bridge converter, the power conversion of the dual-active bridge converter is changed, so as to realize different power outputs, reduce the number of devices used for power conversion, and thus reduce the complexity of the circuit.

[0048] As a preferred example, the controller controls the inverter output circuit to construct an inverter output channel from the output port to the AC input interface, and controls the inverter output circuit to perform inverter conversion on the stable power supply according to the voltage required by the AC input interface, and controls the inverter output channel to output the converted stable power supply to the AC input interface, including:

[0049] The controller performs complementary control on the third switch tube and the fourth switch tube to construct an inverter output channel from the output port to the AC input interface;

[0050] The controller adjusts the duty cycle of the third switch tube and the fourth switch tube according to the voltage required by the AC input interface to control the inverter output circuit to perform frequency bandwidth conversion on the stable power supply it obtains, so as to output the converted stable power supply to the AC input interface.

[0051] In the above solution, by controlling the duty cycle of the switch tubes in the inverter output channel, the direct current output by the dual-active bridge converter is converted into alternating current required by the AC input interface, so as to realize the inverter output of direct current. Brief Description of the Drawings

[0052] Figure 1 : is a schematic structural diagram of a multi-phase inverter output method based on multi-source input disclosed in an embodiment of the present invention;

[0053] Figure 2 : is a schematic structural diagram of a multi-phase inverter output device based on multi-source input disclosed in an embodiment of the present invention;

[0054] Figure 3 : is a schematic structural diagram of a power supply switching switch circuit disclosed in an embodiment of the present invention;

[0055] Figure 4 : Schematic diagram of the structure of a dual-active-bridge converter disclosed in an embodiment of the present invention;

[0056] Figure 5 : Schematic diagram of the structure of a single-phase inverter circuit disclosed in an embodiment of the present invention;

[0057] Figure 6 : Schematic diagram of the structure of a multi-phase inverter output device based on multi-source input disclosed in another embodiment of the present invention;

[0058] Among them, 201 is a controller; 202 is a power supply switching switch circuit; 203 is an inverter output circuit; 204 is a dual-active-bridge converter; 1011 is a first switching tube; 1012 is a second switching tube; 1013 is a first inductor; 1014 is a second inductor; 301 is a third converter switching tube; 302 is a fourth converter switching tube; 303 is a fifth switching tube; 304 is a sixth switching tube; 305 is a seventh switching tube; 306 is an eighth switching tube; 307 is a ninth switching tube; 308 is a tenth switching tube; 309 is a transformer; 310 is a third converter inductor; 311 is a fourth inductor; 401 is a third switching tube; 402 is a fourth switching tube; 403 is a load; 404 is a third inductor. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] Embodiment 1

[0061] The present disclosure embodiment provides a multi-phase inverter output method based on multi-source input, which is applicable to a dual-active-bridge converter to reduce the circuit complexity of multi-source inverter output. Among them, the specific implementation process of the multi-phase inverter output method is referred to Figure 1 , mainly including steps 101 to 104, and the steps are as follows:

[0062] Step 101: Control the dual-active-bridge converter to construct a voltage transformation channel from the first power supply to the output port of the dual-active-bridge converter;

[0063] Step 102: In response to the output demand of the second power supply, construct a power input channel from the second power supply to the dual-active-bridge converter;

[0064] Step 103: According to the voltage transformation channel and the power input channel, controlling the dual active bridge converter to transform the input power obtained by the dual active bridge converter to output a stable power supply;

[0065] Step 104: construct an inverter output channel from the output port to the AC input interface, control the inverter output channel to invert the stable power supply according to the voltage required by the AC input interface, and control the inverter output channel to output the converted stable power supply to the AC input interface.

[0066] In the disclosed embodiment, the above-mentioned multi-phase inverter output method replaces the isolation of the transformer based on the interleaved voltage conversion circuit of the dual-active bridge converter, which can reduce the circuit difficulty required for DC inverter output. Further, when performing DC inverter output, the dual-active bridge converter is first controlled to form a voltage conversion channel when the first power supply performs inverter output. Then, on the basis of the voltage conversion channel, the second power supply and the power input channel of the dual-active bridge converter are constructed to use the power input channel to realize the conversion of multiple DC inputs by a single-channel dual-active bridge converter, and then perform inverter conversion according to the inverter output channel connected to the output port, thereby reducing the number of devices required for inverter conversion of multiple DCs, thereby reducing the circuit difficulty.

[0067] Furthermore, when controlling the dual active bridge converter to form a voltage conversion channel for outputting the first power supply to an external AC input interface, the control process of the dual active bridge converter is specifically as follows:

[0068] Step 1011: Complementarily controlling the switch tubes in the dual-active bridge converter; wherein the complementary control is to control different switch tubes on the same bridge arm to be turned on at different times;

[0069] Step 1012: constructing a voltage transformation channel between the first power source and the output port of the dual active bridge converter based on the complementary control; wherein the output port of the first power source is electrically connected to the input port of the dual active bridge converter.

[0070] In the above scheme, the power transmission direction is controlled by complementary control of the switch tubes in the dual active bridge converter. The complementary control of the switch tubes is used to achieve the voltage conversion of the first power supply, thereby adapting to power supplies with different powers, without the need to configure converters with different power conversion for different power supplies, thereby reducing the complexity of the circuit.

[0071] Further, when constructing the transformer channel to transform the first power supply and then output the transformed power supply to the external AC input interface, in order to achieve multi-source DC input, the second power supply can be connected to the dual-active bridge converter according to the output requirements of the second power supply, so that the dual-active bridge converter transforms the power supplies simultaneously output by the first power supply and the second power supply.

[0072] Specifically, the specific process of the dual-active bridge converter transforming the obtained input power supply is as follows:

[0073] Step 1031: Obtain the electrical quantities at the output port of the dual-active bridge converter; where the electrical quantities include voltage and current;

[0074] Step 1032: Adjust the duty cycle of the switching tubes in the dual-active bridge converter according to the electrical quantities to control the dual-active bridge converter to adjust the frequency bandwidth of the input power supply obtained by the dual-active bridge converter and output the stable power supply.

[0075] In the above solution, by controlling the duty cycle of the switching tubes in the dual-active bridge converter, the power conversion of the dual-active bridge converter is changed, so as to achieve different power outputs, reduce the number of devices used for power conversion, and thus reduce the complexity of the circuit.

[0076] Further, after using the dual-active bridge converter to achieve energy conversion, in order to achieve DC inverter output, an inverter output channel can be set between the output port of the dual-active bridge converter and the external AC input interface to achieve DC inverter output.

[0077] Specifically, the process of controlling the inverter output channel to achieve DC inverter output is as follows:

[0078] Step 1041: Obtain the voltage required by the AC input interface and adjust the duty cycle of the switching tubes in the inverter output channel according to the voltage;

[0079] Step 1042: Control the inverter output channel to adjust the frequency bandwidth of the stable power supply obtained by the inverter output channel according to the adjusted duty cycle, so as to output a converted stable power supply with a frequency bandwidth consistent with the voltage required by the AC input interface.

[0080] In the above solution, by controlling the duty cycle of the switching tubes in the inverter output channel, the DC output by the dual-active bridge converter is converted into the alternating current required by the AC input interface, so as to achieve DC inverter output.

[0081] In the above solution, by controlling the duty cycle of the switching tube in the inverter output channel, the direct current output by the dual active bridge converter is converted into alternating current required by the AC input interface, thereby realizing the inverter output of the direct current.

[0082] On the other hand, an embodiment of the present disclosure provides a multi-phase inverter output device based on multi-source input to reduce the complexity of the circuit required for the inverter output of multiple DC outputs.

[0083] Specifically, the structural composition of the multi-phase inverter output device can refer to Figure 2 , including a controller 201, a plurality of power switching switch circuits 202, an inverter output circuit 203, and a dual active bridge converter 204.

[0084] Among them, the input end of the power switching switch circuit 202 is electrically connected to the first end of the second power supply; the output end of the power switching switch circuit 202 and the input end of the first power supply are respectively electrically connected to the input port of the dual active bridge converter 204; the output port of the dual active bridge converter 204 is electrically connected to the input end of the inverter output circuit 203; the output end of the inverter output circuit 203 is electrically connected to the AC input interface;

[0085] Among them, the dual active bridge converter 204 is signal-connected to the controller 201, so that the controller 201 controls the dual active bridge converter 204 to construct a voltage transformation channel between the output port of the dual active bridge converter 204 and the first power supply;

[0086] The power switching switch circuit 202 is signal-connected to the controller 201, so that the controller 201 controls the power switching switch circuit 202 in response to the output demand of the second power supply to construct a power input channel between the second power supply and the dual active bridge converter 204; among them, the power switching switch circuit 202 corresponds to the second power supply one by one;

[0087] The controller 201 controls the dual active bridge converter 204 to transform the input power obtained by the dual active bridge converter 204 according to the voltage transformation channel and the power input channel, so as to output a stable power supply to the inverter output circuit 203;

[0088] The inverter output circuit 203 is signal-connected to the controller 201, so that the controller 201 controls the inverter output circuit 203 to construct an inverter output channel from the output port to the AC input interface, and controls the inverter output circuit 203 to perform an inverter conversion on the stable power supply according to the voltage required by the AC input interface, and controls the inverter output channel to output the converted stable power supply to the AC input interface.

[0089] In some embodiments of this embodiment, taking the flow direction from the power supply to the AC input interface for inverter output as an example, first, when it is determined that multiple DC inputs are required, the second power supply is connected to the dual-active-bridge converter 204 according to the power switch 202 corresponding to the second power supply to achieve multiple DC inputs.

[0090] In one embodiment, in order to simultaneously supply power to and charge the second power supply, two parallel switch tubes with reverse flow can be arranged in the power switch circuit 202 to realize the power supply and discharge of the second power supply through different flow directions in the switch tubes.

[0091] Specifically, the structural composition of the power switch 202 can refer to Figure 3 . As Figure 3 shown, the power switch 202 includes a first switch tube 1011, a second switch tube 1012, a first inductor 1013, and a second inductor 1014.

[0092] Among them, the source of the first switch tube 1011 is connected to the first end of the second power supply; the drain of the first switch tube 1011 is connected to the first input end of the dual-active-bridge converter 204; the drain of the second switch tube 1012 is connected to the first end of the second power supply, and the source of the second switch tube 1012 is connected to the second input end of the dual-active-bridge converter 204; among them, the first end of the dual-active-bridge converter 204 includes a first input end and a second input end.

[0093] It should be noted that in this embodiment, the switch tubes can be various types of triodes such as NPN triodes and PNP triodes. Among them, when different types of triodes are selected, the connection method between the switch tubes and the second power supply can be changed according to the flow direction of each type of triode.

[0094] Further, when setting the switch tubes to control the energy flow direction of the second power supply, in order to better improve the effect of DC input or output, inductors can be connected in series at the input or output ends of the first switch tube 1011 and the second switch tube 1012 to filter the DC input or DC output of the second power supply.

[0095] Specifically, referring to Figure 3 , the first end of the first inductor 1013 is connected to the drain of the first switch tube 1011; the second end of the first inductor 1013 is connected to the first input end of the dual-active-bridge converter 204;

[0096] The first end of the second inductor 1014 is connected to the source of the second switching transistor 1012; the second end of the second inductor 1014 is connected to the second input terminal of the dual-active-bridge converter 204.

[0097] In the power switching switch circuit 202 disclosed in the above solution, the source of the first switching transistor 1011 is connected to the first end of the second power supply, and the drain of the second switching transistor 1012 is connected to the first end of the second power supply. When receiving the DC input of the second power supply and inputting the external DC input to the second power supply, the bidirectional input or output of multiple power sources can be achieved by driving the first power supply or the second power supply to conduct. Further, an inductor is connected in series between different switching transistors in the power switching switch circuit for energy storage and energy release through the inductor to control the intermittent conduction of the switching transistors and achieve the bidirectional energy flow between the second power supply and the external output interface.

[0098] In an implementation manner of this first embodiment, when using the dual-active-bridge converter 204 to connect the power supply and the external AC input interface to achieve the bidirectional flow of energy and the DC inverter output, in order to enable the dual-active-bridge converter 204 to receive the energy provided by the first power supply and the second power supply at the same time and send it to the external AC input interface, a transformer for voltage conversion and a first-phase bidirectional conversion circuit and a second-phase bidirectional conversion circuit capable of achieving bidirectional energy flow can be provided in the dual-active-bridge converter 204.

[0099] Specifically, the first-phase bidirectional conversion circuit includes a first group of bridge arms and a second group of bridge arms; wherein, the first end of the first power supply and the second end of the second power supply are respectively electrically connected to the first end of the first group of bridge arms; the second end of the first group of bridge arms is electrically connected to the first input terminal of the transformer; the first input terminal of the transformer is the first input terminal of the dual-active-bridge converter 204;

[0100] The first end of the second group of bridge arms is electrically connected to the first end of the first group of bridge arms; the second end of the second group of bridge arms is electrically connected to the second input terminal of the transformer; the second input terminal of the transformer is the second input terminal of the dual-active-bridge converter 204;

[0101] The second-phase bidirectional conversion circuit includes a third group of bridge arms and a fourth group of bridge arms; wherein, the first end of the third group of bridge arms is electrically connected to the first output terminal of the transformer; the first output terminal of the transformer is the first output terminal of the dual-active-bridge converter 204;

[0102] The first end of the fourth bridge arm is electrically connected to the second end of the third bridge arm; the second end of the fourth bridge arm is electrically connected to the second output terminal of the transformer; the second output terminal of the transformer is the second output terminal of the dual active bridge converter 204; wherein, the second end of the dual active bridge converter 204 includes the first output terminal and the second output terminal.

[0103] In the above solution, the dual active bridge converter 204 disclosed is provided with the transformer to achieve voltage conversion, so as to adapt to DC inputs and DC outputs with different voltage values. Further, in order to achieve bidirectional energy exchange through the transformer, bidirectional conversion circuits composed of different bridge arm circuits are respectively arranged at both ends of the transformer, so as to control the energy flow direction of the transformer through the bidirectional conversion circuits, and thus achieve bidirectional energy flow.

[0104] Further, in order to achieve bidirectional energy flow through the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm and the transformer. In some embodiments of this embodiment, switching tubes with reverse flow directions are arranged in each bridge arm, and thus the energy flow is controlled through the switching tubes.

[0105] Specifically, for the specific structural composition of a dual active bridge converter 204 formed by the switching tubes set in this embodiment, please refer to Figure 4 , which mainly includes a third converter switching tube 301, a fourth converter switching tube 302, a fifth switching tube 303, a sixth switching tube 304, a seventh switching tube 305, an eighth switching tube 306, a ninth switching tube 307 and a tenth switching tube 308.

[0106] As Figure 4 shown, the drain of the third converter switching tube 301 and the source of the fourth converter switching tube 302 are the first end of the first bridge arm; the source of the third converter switching tube 301 and the drain of the fourth converter switching tube 302 are the second end of the first bridge arm; the drain of the fifth switching tube 303 and the source of the sixth switching tube 304 are the first end of the second bridge arm; the source of the fifth switching tube 303 and the drain of the sixth switching tube 304 are the second end of the second bridge arm; the source of the seventh switching tube 305 and the drain of the eighth switching tube 306 are the first end of the third bridge arm; the drain of the seventh switching tube 305 and the source of the eighth switching tube 306 are the second end of the third bridge arm; the drain of the ninth switching tube 307 and the source of the tenth switching tube 308 are the first end of the fourth bridge arm; the source of the ninth switching tube 307 and the drain of the tenth switching tube 308 are the second end of the fourth bridge arm.

[0107] As Figure 4As shown, the drain of the third converter switch tube 301 is electrically connected to the discharge terminal of the first power supply; the source of the third converter switch tube 301 is electrically connected to the first input terminal of the transformer 309; the drain of the fourth converter switch tube 302 is electrically connected to the first input terminal of the transformer 309; the source of the fourth converter switch tube 302 is electrically connected to the charging terminal of the first power supply; the source of the fourth converter switch tube 302 is electrically connected to the charging terminal of the second power supply; wherein, the first end of the first power supply includes the discharge terminal and the charging terminal; the charging terminal of the second power supply is the second end of the second power supply;

[0108] The drain of the fifth switch tube 303 is electrically connected to the drain of the third converter switch tube 301; the source of the fifth switch tube 303 is electrically connected to the second input terminal of the transformer 309; the drain of the sixth switch tube 304 is electrically connected to the second input terminal of the transformer 309; the source of the sixth switch tube 304 is electrically connected to the source of the fourth converter switch tube 302.

[0109] The source of the seventh switch tube 305 is electrically connected to the first output terminal of the transformer 309; the drain of the eighth switch tube 306 is electrically connected to the first output terminal of the transformer 309; the drain of the ninth switch tube 307 is electrically connected to the drain of the seventh switch tube 305; the source of the ninth switch tube 307 is electrically connected to the second output terminal of the transformer 309; the drain of the tenth switch tube 308 is electrically connected to the second output terminal of the transformer 309; the source of the tenth switch tube 308 is electrically connected to the source of the eighth switch tube 306.

[0110] In the above solution, switch tubes with unidirectional current flow are arranged on different bridge arms in the second bidirectional conversion circuit of the transformer 309, so that when the third converter switch tube 301 on the first bridge arm and the sixth switch tube 304 on the second bridge arm are simultaneously turned on, or when the fourth converter switch tube 302 on the first bridge arm and the fifth switch tube 303 on the fourth bridge arm are simultaneously turned on, if the seventh switch tube 305 and the tenth switch tube 308 in the second bidirectional conversion circuit are simultaneously turned on, or the eighth switch tube 306 and the ninth switch tube 307 are also in the on state, then the current will flow from the first bidirectional conversion circuit through the transformer to the second bidirectional conversion circuit, realizing the bidirectional flow of energy.

[0111] In a certain implementation manner of this embodiment, in order to improve the efficiency of energy bidirectional flow in the dual-active-bridge converter 204, a third inductor and a fourth inductor can be arranged in the dual-active-bridge converter 204.

[0112] Specifically, the inductor is set to be connected to the switch tube, and thus the formed dual-active-bridge converter 204 can be asFigure 4 As shown. Among them, the first end of the third converter inductor 310 is connected to the first input end of the transformer 309, and the second end of the third converter inductor 310 is connected to the primary side of the transformer 309; the first end of the fourth inductor 311 is connected to the first output end of the transformer 309, and the second end of the fourth inductor 311 is connected to the secondary side of the transformer.

[0113] In the dual-active-bridge converter provided in the above solution, inductors are respectively arranged at both ends of the transformer 309, so that energy can be efficiently transmitted between the active bridges corresponding to both ends of the voltage transformer. At the same time, by adjusting the parameters of the inductors and the on-off states of the switching tubes, precise control of the transmitted power and output voltage can be achieved, thereby improving the conversion effect.

[0114] In a certain implementation manner of this embodiment, when Figure 4 the dual-active-bridge converter 204 shown is used to transform the voltage and send the transformed voltage to an external AC input interface to achieve DC inverter output, in order to achieve DC inverter output, an inverter output circuit can be set in the Figure 2 polyphase inverter output device shown, for Figure 4 inverting and converting the stable power output after voltage transformation by the dual-active-bridge converter 204 shown, and sending the power obtained after inverting and converting to the AC input interface.

[0115] Specifically, in order to achieve polyphase inverter output, several single-phase inverter circuits can be set in the inverter output circuit. Among them, the structural composition of each single-phase inverter circuit can refer to Figure 5 and includes a third switching tube 401, a fourth switching tube 402, a load 403, and a third inductor 404.

[0116] Specifically, in combination with Figure 4 the dual-active-bridge converter 204 shown, the drain of the third switching tube 401 is connected to the drain of the ninth switching tube 307, and the source of the fourth switching tube 402 is electrically connected to the source of the tenth switching tube 308; the source of the third switching tube 401, the drain of the fourth switching tube 402, and the first end of the load 403 are electrically connected; the second end of the load 403 is electrically connected to the first end of the third inductor 404; the second end of the third inductor 404 is electrically connected to the AC input interface.

[0117] In the above solution, the drain of the third switching transistor and the source of the fourth switching transistor are electrically connected to the output port of the dual-active converter to perform complementary control on the third switching transistor and the fourth switching transistor, thereby controlling the energy flow direction. The load and the inductor are provided to perform an inversion conversion according to the voltage required by the AC input interface to achieve the inversion output of DC.

[0118] Further, in order to improve the effect of the inversion output of the DC input, a capacitor can be provided to be connected in parallel with the inversion output circuit 203.

[0119] Referring to Figures 3 to 5 In the polyphase inversion output device shown, the controller 201 performs complementary control on the switching transistors in the dual-active bridge converter 204 to construct a voltage transformation channel from the first power supply to the output port of the dual-active bridge converter 204; the controller 201 performs complementary control on the first switching transistor and the second switching transistor in the power supply switching circuit 202 to construct a power supply input channel between the second power supply and the dual-active bridge converter 204; the controller 201 adjusts the duty cycle of the switching transistors in the dual-active bridge converter 202 to control the dual-active bridge converter 202 to perform a frequency bandwidth transformation on the input power supply it obtains to output a stable power supply to the inversion output circuit 203; wherein, the input power supply includes the first power supply and the second power supply.

[0120] Further, the controller 201 performs complementary control on the third switching transistor 401 and the fourth switching transistor 402 to construct an inversion output channel from the output port to the AC input interface; the controller 201 adjusts the duty cycles of the third switching transistor 401 and the fourth switching transistor 402 according to the voltage required by the AC input interface to control the inversion output circuit 203 to perform a frequency bandwidth transformation on the stable power supply it obtains to output the converted stable power supply to the AC input interface

[0121] In the above solution, the controller 201 performs complementary control on different switching transistors belonging to the same bridge arm, that is, it is used to indicate that the two switching transistors for complementary control cannot be turned on or off simultaneously. For example, the third converter switching transistor 301 and the fourth converter switching transistor 302 cannot be turned on or off simultaneously, and the fifth switching transistor 303 and the sixth switching transistor 304 cannot be turned on or off simultaneously. That is to say, the controller 201 can control different switching transistors to be turned on or off non-simultaneously to achieve bidirectional energy flow.

[0122] A multi-phase inverter output device based on multi-source input disclosed in an embodiment of the present disclosure, when realizing the inverter output of multiple DC inputs, first sets a dual-active bridge converter to be connected to a power supply and an inverter output circuit respectively, so as to realize the bidirectional flow of energy and the inverter output of DC through the dual-active bridge converter and the inverter output circuit, thereby reducing the number of devices required for the inverter output during the bidirectional flow of energy. Further, a plurality of power switch circuits with the same number as the second power supply in the power supply are connected in series at the first end of the dual-active bridge converter, so as to serially connect additional DC inputs to the originally existing dual-active bridge converter through the power switch circuits, and then realize the conversion of multiple DC inputs through one dual-active bridge converter and the power switch circuits, reduce the number of devices required for DC conversion, and thereby reduce the complexity of the circuit.

[0123] Embodiment 2

[0124] In the prior art, a DC-AC converter is often used for the inverter output of DC. However, the existing DC-AC converter can only receive a single DC input. For occasions that require multiple DC inputs and outputs and bidirectional flow, multiple DC-AC converters need to be configured, which not only results in a high circuit complexity but also causes waste of resources. In response to this, an embodiment of the present disclosure takes a dual-power supply system with dual DC inputs as an example, aims to realize three-phase inverter output, and discloses a multi-phase inverter output device based on multi-source input on the basis of a dual-active bridge converter to realize dual DC inputs and three-phase inverter output.

[0125] Specifically, it is set that the dual-power supply system includes a first power supply and a second power supply, that is, the first power supply S1 and the second power supply S2 as shown in Figure 6 Then, the schematic diagram of the circuit structure when a part of the circuit in the multi-phase inverter output device is connected to the dual-power supply system, the dual-active bridge converter, and an external AC input interface for dual DC inputs and three-phase inverter output is as shown in Figure 6 shown.

[0126] Further, in order to realize dual DC inputs and three-phase inverter output through the dual-power supply system, a second power switch circuit for switching the working state of the second power supply, a dual-active bridge converter for receiving the first voltage sent by the dual-power supply system and stepping it down, a three-phase inverter circuit for performing inverter output on the stepped-down voltage, and a controller for controlling the second power switch circuit, the dual-active bridge converter, and the three-phase inverter circuit can be set in the multi-phase inverter output device. Preferably, based on the dual-active bridge converter, bidirectional energy flow can be realized. Therefore, an emergency power supply can be connected in series in each phase inverter circuit of the three-phase inverter circuit, such as power supply ea, power supply ea, and power supply ec.

[0127] As Figure 6 shown, the second power supply switching switch circuit includes a switching transistor Q28, a switching transistor Q27, an inductor L8, and an inductor L9. Among them, the source of the switching transistor Q28 is connected to the first end of the second power supply S2; the drain of the switching transistor Q27 is connected to the first end of the second power supply S2; the drain of the switching transistor Q28 is connected to the first end of the inductor L8; the source of the switching transistor Q27 is connected to the first end of the inductor L9.

[0128] As Figure 6 shown, the dual active bridge converter includes switching transistors Q29 to Q32, switching transistors Q23 to Q26, a transformer U2, an inductor L10, and an inductor L9.

[0129] Among them, the drain of the switching transistor Q32 is connected to the first end of the first power supply S1; the source of the switching transistor Q32 is connected to the first end of the transformer U2; the second end of the inductor L10 is connected to the first end of the transformer U2;

[0130] the drain of the switching transistor Q31 is connected to the first end of the transformer U2, and the source of the switching transistor Q31 is connected to the second end of the second power supply S2 and the second end of the first power supply S1;

[0131] the drain of the switching transistor Q30 is connected to the drain of the switching transistor Q32, and the source of the switching transistor Q30 is connected to the second end of the transformer U2;

[0132] the drain of the switching transistor Q29 is connected to the second end of the transformer U2; the source of the switching transistor Q29 is connected to the source of the switching transistor Q31;

[0133] the first end of the inductor L10 is connected to the first end of the transformer U2, and the second end of the inductor L10 is connected to point 1 in the primary side of the transformer U2;

[0134] the first end of the inductor L9 is connected to the third end of the transformer U2, and the second end of the inductor L9 is connected to the opposite-named end point 3 corresponding to point 1 in the secondary side of the transformer U2.

[0135] the drain of the switching transistor Q23 is connected to the drain of the switching transistor Q25; the source of the switching transistor Q23 is connected to the third end of the transformer U2;

[0136] the drain of the switching transistor Q24 is connected to the third end of the transformer U2, and the source of the switching transistor Q24 is connected to the source of the switching transistor Q26;

[0137] The source electrode of the switching transistor Q25 is connected to the fourth terminal of the transformer U2; the drain electrode of the switching transistor Q26 is connected to the fourth terminal of the transformer U2.

[0138] As Figure 6 shown, the three-phase inverter circuit includes a first inverter circuit, a second inverter circuit, and a third inverter circuit; wherein, the first inverter circuit includes a switching transistor Q22, a switching transistor Q21, a load R6, and an inductor L5.

[0139] Wherein, the source electrode of the switching transistor Q22 and the drain electrode of the switching transistor Q21 are connected to the first end of the load R6; the drain electrode of the switching transistor Q22 is connected to the drain electrode of the switching transistor Q25; the source electrode of the switching transistor Q21 is connected to the source electrode of the switching transistor Q26; the second end of the load R6 is connected to the first end of the inductor L5; the second end of the inductor L5 is connected to an external AC input interface.

[0140] Similarly, the second inverter circuit includes a switching transistor Q20, a switching transistor Q19, a load R5, and an inductor L4.

[0141] Wherein, the source electrode of the switching transistor Q20 and the drain electrode of the switching transistor Q19 are connected to the first end of the load R5; the drain electrode of the switching transistor Q20 is connected to the drain electrode of the switching transistor Q25; the source electrode of the switching transistor Q19 is connected to the source electrode of the switching transistor Q26; the second end of the load R5 is connected to the first end of the inductor L4; the second end of the inductor L4 is connected to an external AC input interface.

[0142] The third inverter circuit includes a switching transistor Q17, a switching transistor Q18, a load R4, and an inductor L3.

[0143] Wherein, the source electrode of the switching transistor Q17 and the drain electrode of the switching transistor Q18 are connected to the first end of the load R4; the drain electrode of the switching transistor Q17 is connected to the drain electrode of the switching transistor Q25; the source electrode of the switching transistor Q18 is connected to the source electrode of the switching transistor Q26; the second end of the load R4 is connected to the first end of the inductor L3; the second end of the inductor L3 is connected to an external AC input interface.

[0144] Further, in order to improve the effect of the inverter output, a capacitor can also be connected in parallel at both ends of the three-phase inverter circuit, that is, as Figure 6 shown, the capacitor C2; wherein, one end of the capacitor C2 is connected to the drain electrode of the switching transistor Q25, and the other end is connected to the source electrode of the switching transistor Q26.

[0145] Referring to Figure 6The polyphase inverter output device with multiple DC inputs shown, when it is determined that the second power supply S2 performs DC inverter output, first, the controller controls the switch Q28 to conduct to connect the second power supply S2 to the dual-active-bridge converter.

[0146] Immediately in the dual-active-bridge converter, the on-state of the switches can indeed determine the current flow direction. Among them, the dual-active-bridge converter is formed by connecting two full-bridge circuits (i.e., the H1 bridge composed of switches Q29 to Q32 and the H2 bridge composed of switches Q23 to Q26) through a high-frequency transformer and a resonant inductor. Each full-bridge circuit consists of four switches and can independently control the voltage at the midpoint of the bridge arm. By controlling the on and off of the switches, the polarity and magnitude of the voltage at the midpoint of the bridge arm can be changed, thereby controlling the flow direction and magnitude of energy.

[0147] Furthermore, when the energy flow direction in the dual-active-bridge converter is forward energy transfer, when the controller controls the switches Q29 and Q32 of the H1 bridge to conduct simultaneously (or Q31 and Q30 to conduct simultaneously, but here Q29 and Q32 are taken as an example for illustration), the voltage at the midpoint of the bridge arm of the H1 bridge is positive. At this time, if the switches Q23 and Q26 (or Q24 and Q25) of the H2 bridge are also in the on-state, the current will flow from the H1 bridge through the transformer to the H2 bridge, realizing forward energy transfer. The specific current flow path depends on the on-state of the switches of the H2 bridge. For example, if Q32 and Q29 are conducting, the current will flow from the positive pole of the H1 bridge through Q32 and the transformer to the H2 bridge, and then through Q23 and the load back to the negative pole of the H1 bridge, forming a forward current loop.

[0148] When the energy flow direction in the dual-active-bridge converter is reverse energy transfer, the on-states of the switches of the H1 bridge and the H2 bridge will be opposite. That is, the H1 bridge operates as a rectifier, and the H2 bridge operates as an inverter.

[0149] At this time, if the switches Q23 and Q26 of the H2 bridge are conducting (or Q24 and Q25 are conducting), the voltage at the midpoint of the bridge arm of the H2 bridge is positive. The current will flow from the H2 bridge through the transformer to the H1 bridge, realizing reverse energy transfer. At this time, the specific current flow path also depends on the on-state of the switches. For example, if Q23 and Q26 are conducting, the current will flow from the positive pole of the H2 bridge through Q23 and the transformer to the H1 bridge, and then through the anti-parallel diode of Q32 and the load back to the negative pole of the H2 bridge, forming a reverse current loop.

[0150] In practical applications, in order to achieve soft switching and reduce switching losses, there is usually a certain dead time for the on and off of the switching device. During the dead time, the switching device is in the off state, but the current may continue to flow through the anti-parallel diode. Usually, a phase-shift control strategy is adopted to regulate the transmitted power and output voltage. By changing the phase difference of the conduction of the switching device, the direction and magnitude of energy transmission can be controlled.

[0151] In summary, by controlling the conduction state of the switching device in the dual-active-bridge converter, the conduction direction and magnitude of the current can be precisely controlled, and efficient and bidirectional energy transmission can be achieved.

[0152] A multi-phase inverter output device based on multi-source input disclosed in this embodiment can achieve three modes of energy transfer from the first power source S1 to the three-phase inverter circuit, from the second power source S2 to the three-phase inverter circuit, and from the first power source S1 and the second power source S2 to the three-phase inverter circuit. The control method is basically the same as that of a general dual-active bridge. First, the duty cycles of the switching signals of switches Q23, Q24, Q25, Q26, Q29, Q30, Q31, and Q32 are kept constant at 50%, and it is only necessary to ensure that the switching signals of the upper and lower switching devices in the same bridge arm are complementary.

[0153] Furthermore, the circuit disclosed in this embodiment has diverse and flexible usage scenarios. The first power source S1 and the second power source S2 can be replaced with photovoltaic panels. At the same time, based on the connection method of the second power source S2, a third power source, a fourth power source, etc. can be added, that is, the connection methods of the third power source and the fourth power source are the same as that of the second power source S2 (parallel connection). In addition, a single-phase inverter circuit can also be added to the output end to achieve multi-phase inverter output, etc., so as to be able to meet multiple DC inputs with fewer components and without transformer isolation.

[0154] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-phase inverter output method based on multi-source input, characterized in that: Applicable to a dual-active bridge converter; the output port of the dual-active bridge converter is electrically connected to an AC input interface; wherein the multi-phase inverter output method includes: Controlling the dual active bridge converter to construct a voltage conversion channel from a first power source to an output port of the dual active bridge converter; In response to an output requirement of a second power supply, constructing a power input channel from the second power supply to the dual active bridge converter; According to the voltage transformation channel and the power input channel, the dual active bridge converter is controlled to transform the input power obtained by the dual active bridge converter to output a stable power supply; Construct an inverter output channel from the output port to the AC input interface, control the inverter output channel to perform inversion conversion on the stable power supply according to the voltage required by the AC input interface, and control the inverter output channel to output the converted stable power supply to the AC input interface.

2. A multi-phase inverter output method based on multi-source input according to claim 1, characterized in that: The step of constructing a voltage conversion channel from the first power source to the output port of the dual active bridge converter comprises: Complementary control is performed on the switch tubes in the dual-active bridge converter; wherein the complementary control is to control different switch tubes on the same bridge arm to be turned on at different times; A voltage transformation channel from the first power supply to the output port of the dual active bridge converter is constructed based on the complementary control; wherein the output port of the first power supply is electrically connected to the input port of the dual active bridge converter.

3. The multi-phase inverter output method based on multi-source input according to claim 1, characterized in that: The input power source includes the first power source and the second power source; and the controlling the dual-active bridge converter to transform the input power source obtained by the dual-active bridge converter according to the voltage transformation channel and the power input channel to output a stable power source includes: Acquiring electrical quantities of the output port of the dual active bridge converter; wherein the electrical quantities include voltage and current; The duty cycle of the switch tube in the dual-active bridge converter is adjusted according to the electrical quantity to control the dual-active bridge converter to adjust the bandwidth of the input power obtained by the dual-active bridge converter and output the stable power supply.

4. The multi-phase inverter output method based on multi-source input according to claim 3 is characterized in that: The step of constructing an inverter output channel from the output port to the AC input interface to convert the stable power supply according to the voltage required by the inverter output channel and the AC input interface, and outputting the converted stable power supply to the AC input interface includes: Acquire the voltage required by the AC input interface, and adjust the duty cycle of the switch tube in the inverter output channel according to the voltage; The inverter output channel is controlled to adjust the bandwidth of the stable power source obtained by the inverter output channel according to the adjusted duty cycle, so as to output a converted stable power source having a bandwidth consistent with the voltage required by the AC input interface.

5. A multi-phase inverter output device based on multi-source input, characterized in that: It includes a dual active bridge converter, a controller, a power switching circuit and an inverter output circuit; The input end of the power switching circuit is electrically connected to the first end of the second power supply; the output end of the power switching circuit and the input end of the first power supply are electrically connected to the input port of the dual active bridge converter respectively; the output port of the dual active bridge converter is electrically connected to the input end of the inverter output circuit; the output end of the inverter output circuit is electrically connected to the AC input interface; The dual active bridge converter is connected to the controller signal so that the controller controls the dual active bridge converter to construct a voltage conversion channel between the output port of the dual active bridge converter and the first power supply; The power switching circuit is connected to the controller signal so that the controller controls the power switching circuit in response to the output demand of the second power supply to construct a power input channel between the second power supply and the dual active bridge converter; The controller controls the dual-active bridge converter to transform the input power obtained by the dual-active bridge converter according to the voltage transformation channel and the power input channel, so as to output a stable power supply to the inverter output circuit; The inverter output circuit is connected to the controller signal so that the controller controls the inverter output circuit to construct an inverter output channel from the output port to the AC input interface, and controls the inverter output circuit to perform inverter conversion on the stable power supply according to the voltage required by the AC input interface, and controls the inverter output channel to output the converted stable power supply to the AC input interface.

6. A multi-phase inverter output device based on multi-source input according to claim 5, characterized in that: The power switching circuit includes a first switch tube and a second switch tube; Wherein, the source of the first switch tube is connected to the output end of the second power supply; the drain of the first switch tube is connected to the first input end of the dual active bridge converter; The drain of the second switch tube is connected to the output end of the second power supply, and the source of the second switch tube is connected to the second input end of the dual active bridge converter; wherein the input end of the dual active bridge converter includes a first input end and a second input end.

7. A multi-phase inverter output device based on multi-source input according to claim 6, characterized in that: The power switching circuit also includes a first inductor and a second inductor; Wherein, the first end of the first inductor is connected to the drain of the first switch tube; the second end of the first inductor is connected to the first input end of the dual active bridge converter; A first end of the second inductor is connected to the source of the second switch tube; a second end of the second inductor is connected to the second input end of the dual active bridge converter.

8. The multi-phase inverter output device based on multi-source input according to claim 5, characterized in that: The inverter output circuit includes a plurality of single-phase inverter circuits; wherein each of the single-phase inverter circuits includes a third switch tube, a fourth switch tube, a load and a third inductor; Wherein, the drain of the third switch tube and the source of the fourth switch tube are electrically connected to the output port of the dual active converter; The source of the third switch tube and the drain of the fourth switch tube are electrically connected to the first end of the load; The second end of the load is electrically connected to the first end of the third inductor; and the second end of the third inductor is electrically connected to the AC input interface.

9. A multi-phase inverter output device based on multi-source input according to any one of claims 5-6, characterized in that: The controller controls the dual-active bridge converter to transform the input power obtained by the dual-active bridge converter according to the voltage transformation channel and the power input channel, so as to output a stable power supply to the inverter output circuit, including: The controller performs complementary control on the switch tubes in the dual-active bridge converter to construct a voltage conversion channel from the first power source to the output port of the dual-active bridge converter; The controller performs complementary control on the first switch tube and the second switch tube in the power switching circuit to construct a power input channel between the second power source and the dual active bridge converter; The controller adjusts the duty cycle of the switch tube in the dual-active bridge converter to control the dual-active bridge converter to convert the bandwidth of the input power it obtains to output a stable power supply to the inverter output circuit; wherein the input power supply includes the first power supply and the second power supply.

10. The multi-phase inverter output device based on multi-source input according to claim 8, characterized in that: The controller controls the inverter output circuit to construct an inverter output channel from the output port to the AC input interface, controls the inverter output circuit to perform inverter conversion on the stable power supply according to the voltage required by the AC input interface, and controls the inverter output channel to output the converted stable power supply to the AC input interface, including: The controller performs complementary control on the third switch tube and the fourth switch tube to construct an inverter output channel from the output port to the AC input interface; The controller adjusts the duty cycle of the third switch tube and the fourth switch tube according to the voltage required by the AC input interface to control the inverter output circuit to convert the bandwidth of the stable power supply obtained by it to output the converted stable power supply to the AC input interface.

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