Multi-input and multi-output converter with alternating-current and direct-current output forms and control method

Abstract

The invention discloses a multi-input and multi-output converter with an alternating-current and direct-current output mode and a control method. The converter comprises a first-stage input port and a second-stage output port. The method comprises the following steps: sampling to obtain an inductive current, carrying out constant current control on a plurality of voltage source mode units of a first-stage input port, and outputting a stable controlled inductive current; a control signal is generated according to the stable controlled inductive current, and direct duty ratio control is carried out on a second-stage output port; and the output mode of the converter is controlled by controlling the opening and closing of the fourth switching device. According to the embodiment of the invention, the output ports of the converter have no cross influence and can have direct current energy output and alternating current energy output. The method can be widely applied to the technical field of power electronics.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a multi-input and output converter with AC and DC output and a control method thereof. Background Art

[0002] With the development of modern electrical and electronic systems, the demand for flexible and high-performance power conversion solutions has increased significantly. To meet this growing demand, multi-port converters (MIMO converters) have gradually been widely used as a promising solution, covering a variety of fields from renewable energy systems to advanced electronic networks. Multi-port converters are usually designed to handle multiple input and output ports simultaneously. Unlike traditional single-input single-output (SISO) converters, multi-port converters can integrate and manage energy from multiple power sources and distribute it efficiently and flexibly to multiple loads. This capability is particularly important in scenarios where multiple energy sources such as solar panels and batteries need to be coordinated and distributed. Research on multi-port converters mainly focuses on topology and control design. A variety of multi-port converters have been developed.

[0003] However, current multi-port converters have problems such as insufficient scalability, cross-interference, and a single output form. Summary of the Invention

[0004] The main purpose of the embodiments of the present application is to propose a multi-input and output converter with AC / DC output and a control method, which can ensure that there is no cross-influence between the output ports of the converter and can have DC energy output and AC energy output.

[0005] To achieve the above objectives, an embodiment of the present application provides a multi-input-output converter with AC / DC output, the converter comprising a first-stage input port and a second-stage output port, wherein the output of the first-stage input port is connected to the input of the second-stage output port, wherein:

[0006] The first-stage input port includes a plurality of input voltage sources and a plurality of voltage source mode units, wherein the plurality of input voltage sources are used to supply power to the plurality of voltage source mode units, and the plurality of voltage source mode units are used to provide a stable controlled inductor current to the second-stage output port;

[0007] The second-stage output port includes a plurality of current source mode units and a plurality of LC resonant tanks. The output ends of the plurality of current source mode units are connected one-to-one with the input ends of the plurality of LC resonant tanks. The plurality of LC resonant tanks are connected one-to-one with the plurality of electrical devices. The plurality of current source mode units are connected in series. The plurality of current source mode units are used to generate electrical energy in a direct current form. The plurality of LC resonant tanks are used to convert the electrical energy in a direct current form generated by the plurality of current source mode units into electrical energy in an alternating current form.

[0008] In some embodiments, the voltage source mode unit includes a plurality of first switching devices, a first energy storage inductor element and a plurality of diode elements, the first end of the first switching device is connected to the positive terminal of the input voltage source, the second end of the first switching device and the first end of the first energy storage inductor element are connected to the negative terminal of the diode element, the positive terminal of the diode element is connected to the negative terminal of the input voltage source, the second end of the first energy storage inductor element is connected to the input terminal of the current source mode unit, and the energy storage inductor element is shared by a plurality of the voltage source mode units.

[0009] In some embodiments, the current source mode unit includes a plurality of second switching devices, a plurality of third switching devices and an energy storage capacitor element, the first end of the second switching device and the first end of the third switching device are connected to the output end of the voltage source mode unit, the second end of the second switching device is connected to the second end of the energy storage capacitor element, and the second end of the third switching device is connected to the first end of the energy storage capacitor element.

[0010] In some embodiments, the LC resonant tank includes a plurality of energy storage capacitor elements, a plurality of second energy storage inductor elements and a plurality of fourth switching devices, the first end of the energy storage capacitor element is connected to the first end of the second energy storage inductor element, the second end of the energy storage capacitor element is connected to the second end of the fourth switching device, and the second end of the second energy storage inductor element is connected to the first end of the fourth switching device.

[0011] To achieve the above-mentioned object, another aspect of the present invention provides a control method for a multi-input-output converter having an AC / DC output, the method comprising the following steps:

[0012] Sampling the inductor current and performing constant current control on several voltage source mode units at the first-stage input port to output a stable controlled inductor current;

[0013] generating a control signal according to the stable controlled inductor current to directly control the duty cycle of the second-stage output port;

[0014] The output mode of the converter is controlled by controlling the opening and closing of the fourth switch device.

[0015] In some embodiments, the sampling and obtaining of the inductor current and the constant current control of the plurality of voltage source mode units at the first-stage input port to output a stable controlled inductor current include:

[0016] Acquire the inductor current by a current sampling method and set a standard reference current;

[0017] performing a difference calculation on the inductor current and the reference current to obtain a current error signal;

[0018] Performing proportional integral calculation on the current error signal and comparing the result through a comparator to obtain a first switch device control signal;

[0019] The on-off state of the first switching device is controlled by the first switching device control signal to output the stable controlled inductor current.

[0020] In some embodiments, generating a control signal based on the stable controlled inductor current to directly control the duty cycle of the second-stage output port includes:

[0021] Comparing the stable controlled inductor current with the current of the second-stage output port, and setting a reference voltage signal and a sawtooth voltage signal;

[0022] Inputting the reference voltage signal and the sawtooth wave voltage signal into a comparator for comparison to obtain a switching signal;

[0023] The on-off states of the second switching device and the third switching device are controlled by the switching signal, so that the second-stage output port generates a desired output current.

[0024] In some embodiments, controlling the output mode of the converter by controlling the opening and closing of the fourth switching device includes:

[0025] If the fourth switch device is in an off state, the converter outputs DC power;

[0026] If the fourth switch device is in a closed state, the converter outputs AC power.

[0027] In some embodiments, further comprising:

[0028] When the fourth switch device is in a closed state, the LC resonant tank enters a working state;

[0029] By setting the values ​​of the energy storage capacitor element and the second energy storage inductor element, the converter outputs AC power with a target preset frequency.

[0030] In some embodiments, further comprising:

[0031] Selecting an input voltage source and connecting it to a first-stage input port, and configuring multiple second-stage output ports so that the converter is in a single-input multiple-output mode;

[0032] Selecting multiple input voltage sources and correspondingly connecting them to multiple first-stage input ports, and configuring a second-stage output port, so that the converter is in a multi-input single-output mode;

[0033] A plurality of input voltage sources are selected and connected to a plurality of first-stage input ports accordingly, and a plurality of second-stage output ports are configured, so that the converter is in a multi-input multi-output mode.

[0034] Embodiments of the present application include at least the following beneficial effects: The present application provides a multi-input-output converter with AC / DC output and a control method. This solution samples the inductor current at a first-stage input port and performs constant current control on the first-stage input port, outputting a stable, controlled inductor current. A control signal is generated based on the stable, controlled inductor current and a desired output current value, directly controlling the duty cycle of the second-stage output port. Furthermore, the output mode of the converter is controlled by controlling the opening and closing of a switch connected in series with the resonant inductor at the output port. Current source mode units in the second-stage output port are connected in series, and the input current at the output port is transferred between the current source mode units, maintaining stability and not changing due to factors such as the load of individual output ports. Therefore, the output ports are independent of each other and do not generate cross-influences. Furthermore, an LC resonant tank in the second-stage output port is used to select frequency to generate AC power, rather than being limited to DC output. When the LC resonant tank is in an operating state, AC power of a specific frequency can be selected to obtain an AC output. If the LC resonant tank is in an inoperative state, the output port maintains a DC output. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a multi-input-output converter with AC / DC output provided by an embodiment of the present application;

[0036] Figure 2 This is a flowchart of the steps of a control method for a multi-input-output converter with AC / DC output provided by an embodiment of the present application;

[0037] Figure 3 1 is a schematic structural diagram of a converter circuit with three input ports and three output ports provided in an embodiment of the present application;

[0038] Figure 4 Schematic diagram of the first-stage and second-stage control of the converter provided in an embodiment of the present application;

[0039] Figure 5 1 is a schematic diagram of experimental results of the converter provided in the embodiment of the present application when operating in a steady state;

[0040] Figure 6 This is a schematic diagram of experimental results when the second output port of the converter provided by an embodiment of the present application is switched to a DC output working mode;

[0041] Figure 7 This is a schematic diagram of the changes in each output port when the load of the third output port of the converter provided in an embodiment of the present application suddenly changes. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are merely examples of systems and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0043] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0044] The terms "at least one", "plurality", "each", "any", etc. used in this application include "at least one", "two" or more, "plurality" or "each", "any" or "any one", "each" or "any one" as used herein.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0046] There are some deficiencies in the related technology, such as:

[0047] Insufficient scalability: Some multi-port converters have complex topologies, and as the system scales up, the number of components required increases dramatically. This not only increases hardware costs but also challenges the reliability of the entire system, as more components mean a higher risk of failure. At the same time, the control scheme becomes extremely complex. In an expanded system, coordinated control between different input sources and output loads becomes more difficult, requiring precisely designed control algorithms to ensure that all components work together. Furthermore, how to rationally allocate limited resources (such as power and energy) to the newly added input and output ports also requires careful design.

[0048] Cross-influence problem: In existing multi-port converter systems, the output ports are not independent of each other and exhibit significant cross-influence. This means that when the output power of one output port changes, this change is transmitted to the other output ports, affecting their output power. To mitigate this adverse cross-influence, researchers have made numerous efforts. For example, some scholars have proposed digital control methods based on model predictive control; to further improve regulation performance, some scholars have proposed deadbeat control schemes. However, while these control methods have improved the cross-influence problem to a certain extent, they have also introduced new problems. They are generally complex and require a large amount of computing resources to implement the corresponding algorithms.

[0049] Single output form: Existing solutions for mitigating cross-influences mostly support only a single output form, such as the common DC output. However, in real-world applications, load types and requirements are becoming increasingly diverse, and mixed loads are becoming increasingly common. For example, in some smart buildings or industrial automation systems, there are devices that require DC power, such as sensors and microprocessors, as well as devices that require AC power, such as motors and lighting fixtures. Existing technical solutions are significantly limited in their application because they cannot simultaneously meet the needs of these different load types.

[0050] In light of this, embodiments of the present application provide a multi-input / output converter with AC / DC outputs. This converter achieves high scalability, eliminates crosstalk, and simplifies control logic. Specifically, it supports flexible output formats, meaning the output ports support either AC or DC output, and can switch between AC and DC as needed. Furthermore, embodiments of the present invention can achieve high-frequency AC power supply, thus enabling wireless power transmission.

[0051] Reference Figure 1 , Figure 1 A schematic diagram of a multi-input-output converter with AC / DC output provided by an embodiment of the present invention, referring to Figure 1The converter includes a first-stage input port and a second-stage output port, wherein the output end of the first-stage input port is connected to the input end of the second-stage output port.

[0052] In this embodiment, if Figure 1 As shown in Figure 1, it is a converter topology with multiple input ports and multiple output ports, which is used for energy conversion and management of multiple power supplies and loads. The converter circuit structure is divided into two stages, namely the first stage (input stage) on the left, which includes various input voltage sources V in,1 To V in,m , the first switching device S in,1 To S in,m , diode element D in,1 to D in,m And the first energy storage inductor element L; the right side is the second stage (output stage), including the second switching device S 11 To S n1 , the third switching device S 12 To S n2 , the fourth switching device S 13 To S n3 , energy storage capacitor elements C1 to C n and the second energy storage inductor elements L1 to L n .

[0053] The first-stage input port includes a plurality of input voltage sources and a plurality of voltage source mode units, wherein the plurality of input voltage sources are used to provide energy for the converter operation, and the plurality of voltage source mode units are used to provide a stable controlled inductor current for the second stage;

[0054] Specifically, the voltage source mode unit includes several first switching devices, a first energy storage inductor element and several diode elements. The first end of the first switching device is connected to the positive end of the input voltage source, the second end of the first switching device and the first end of the first energy storage inductor element are connected to the negative end of the diode element, the positive end of the diode element is connected to the negative end of the input voltage source, the second end of the first energy storage inductor element is connected to the input end of the current source mode unit, and the energy storage inductor element is shared by several of the voltage source mode units.

[0055] In this embodiment, a voltage source mode (VSM) unit is formed by a switching device (such as a MOSFET or an IGBT), an energy storage element (an inductor), and a diode. Figure 3 As shown in the figure, the VSM unit at the first input end, the inductor L is connected to the switch S in,1And diode D1, where the conduction direction of diode D1 is opposite to the current direction of the input source, and the inductor L at the tail of the VSM unit is shared by the VSM units of each port.

[0056] The second-stage output port includes a plurality of current source mode units and a plurality of LC resonant tanks. The output ends of the plurality of current source mode units are connected one-to-one with the input ends of the plurality of LC resonant tanks. The plurality of LC resonant tanks can be connected one-to-one with a plurality of electrical devices, and the plurality of current source mode units are connected in series. The plurality of current source mode units are used to generate electrical energy in a direct current form, and the plurality of LC resonant tanks are used to convert the direct current form of electrical energy generated by the current source mode units into alternating current form of electrical energy.

[0057] Specifically, the current source mode unit includes several second switching devices, several third switching devices and an energy storage capacitor element, the first end of the second switching device and the first end of the third switching device are connected to the output end of the voltage source mode unit, the second end of the second switching device is connected to the second end of the energy storage capacitor element, and the second end of the third switching device is connected to the first end of the energy storage capacitor element.

[0058] In this embodiment, the current source mode (CSM) unit is composed of a switching device and an energy storage element (capacitor), such as Figure 3 As shown in the figure, the first output CSM unit, S 11 and C 12 After being connected in parallel, they are connected in series with capacitor C1.

[0059] Specifically, the LC resonant tank includes several energy storage capacitor elements, several second energy storage inductor elements and several fourth switching devices, the first end of the energy storage capacitor element is connected to the first end of the second energy storage inductor element, the second end of the energy storage capacitor element is connected to the second end of the fourth switching device, and the second end of the second energy storage inductor element is connected to the first end of the fourth switching device.

[0060] In this embodiment, the LC resonant tank, i.e., a resonant network composed of a capacitor and an inductor connected in parallel, is located at the output port, such as Figure 3 As shown in the figure, the capacitor C1 and inductor L1 of the first output port are connected in parallel to form an LC resonant tank, and the switch S 13 Control its working state, when S 13 When closed, the LC resonant tank is in working state, and the output form of this port is AC output. 13 When disconnected, the LC resonant tank is in a non-working state, and the output form of this port is DC output.

[0061] See also Figure 2 The present application also provides a method for controlling a multi-input-output converter with AC / DC output, which can realize the control of the multi-input-output converter with AC / DC output. The control method includes:

[0062] S100, sampling and obtaining the inductor current and performing constant current control on the first-stage input port to output a stable controlled inductor current;

[0063] It should be noted that, in some embodiments, step S100 may include: S110, sampling and obtaining the inductor current, and setting a standard reference current signal; S120, performing a difference calculation between the sampled current value and the standard reference current value to obtain a current error signal; S130, performing a proportional integral calculation on the current error signal and comparing it through a comparator to obtain a first switching device control signal; S140, controlling the on-off state of the first switching device through the first switching device control signal, and outputting the stable controlled inductor current, that is, performing constant current control on the inductor current.

[0064] In some specific embodiments, Figure 4 As shown, in the first level control scheme, through the closed loop control circuit and switch S in,m For the inductor current I mid Control so that I mid Stable. The specific method is to sample I mid and the set current I 设定 Set the difference operation to be performed, and the error is processed by PI (proportional integral) operation. The obtained signal is then generated by the comparator to generate a switch signal to control the switch S in,m The signal Q in,m , use this signal to control I mid , so that I mid Stable at I 设定 Near the set value.

[0065] S200, further setting a control signal according to the stable controlled inductor current to directly control the duty cycle of the second-stage output port;

[0066] It should be noted that, in some embodiments, step S200 may include: S210, setting a reference voltage signal and a sawtooth voltage signal; S220, inputting the reference voltage signal and the sawtooth voltage signal into a comparator for comparison to obtain a switching signal; S230, controlling the on and off states of the second switching device and the third switching device through the switching signal, so that the second-stage output port generates the desired DC electrical energy.

[0067] In some specific embodiments, Figure 4As shown, in the second-level control scheme, a reference voltage v is set according to the actual output requirements. Sn1 The sawtooth wave signal of a specific frequency is connected to the comparator to obtain a switching signal Q of the frequency and a specific duty cycle. Sn1 , Q Sn2 , used to control the complementary switches Sn1 and Sn2, thereby controlling the size, frequency and other characteristics of the output energy.

[0068] S300, controlling the output mode of the converter according to actual application requirements;

[0069] It should be noted that, in some embodiments, step S300 may include: S310, if the fourth switch device is controlled to be in an open state, the converter outputs DC power; S320, if the fourth switch device is controlled to be in a closed state, the converter outputs AC power.

[0070] In some specific embodiments, the output mode (AC or DC) is selected according to the actual output requirements, that is, by controlling Q Sn3 Select whether to close switch Sn3. In DC mode, open the resonant network switch Sn3 to output DC energy. In AC mode, close Sn3 to activate the LC resonant network, and select AC energy of a specific frequency (determined by the selected values ​​of inductor L and capacitor C) through the LC resonant tank to achieve AC output.

[0071] More specifically, the multi-port feature can be flexibly utilized as needed, for example:

[0072] 1) In single-input multiple-output mode, you can choose to connect an input source to any one of the three input ports, and the other input ports are left vacant. The number of output ports and output characteristics are configured as needed (DC or AC output form is selected by controlling Sn3), and the corresponding control circuit and component parameters are customized to obtain the control signal and output power with the required characteristics (specific size, frequency, etc.).

[0073] 2) In multi-input single-output mode, you can choose to connect multiple input sources to the corresponding input ports, and the remaining input ports are vacant; select an output port as needed, select the output characteristics (select DC or AC output form by controlling Sn3), and customize the corresponding control circuit and component parameters to obtain the control signal and output power with the required characteristics (specific size, frequency, etc.).

[0074] 3) In multi-input and multi-output mode, you can choose to connect multiple input sources to the corresponding input ports, and the remaining input ports are vacant; configure the number of output ports and output characteristics as needed (select DC or AC output form by controlling Sn3), and customize the corresponding control circuit and component parameters to obtain the control signal and output power with the required characteristics (specific size, frequency, etc.).

[0075] Therefore, combined Figure 3 as well as Figure 4 To further explain, in this case, the first stage is composed of three VSM units connected in series and one inductor L. The inductor L can be shared by the three VSM units.

[0076] For the second stage, three CSM units are connected in series, and an inductor L is connected in parallel in the circuit. m , and C m The use of CSM units effectively reduces the need for additional inductors.

[0077] The first stage should be controlled by switch S in,m Generate a constant controlled current to the second stage to avoid the cross-effect of the three series CSM units in the second stage. Here, in order to simplify the operation, constant current control is implemented for all input units. That is, through Figure 4 The closed-loop control circuit shown in the first-level control scheme samples I mid And through PI operation and comparator, a control signal Q is generated. in,m For controlling switch S in,m The switching frequency is combined with the VSM unit to modulate the input power to generate a stable current I mid Provided to the second stage circuit behind.

[0078] Since there is a direct relationship between the input current and the output current of the CSM unit, direct duty cycle control is used as the control method for the output unit, that is, by Figure 4 The control circuit of the second-level control scheme selects the appropriate reference signal v according to the requirements Sn1 The comparator generates control signals for two complementary switches, Sn1 and Sn2, using a sawtooth signal and a comparator (the drive signals for Sn1 and Sn2 are 180 degrees out of phase). In DC mode, the resonant network switch Sn3 is disconnected, outputting DC energy. In AC mode, Sn3 is closed, activating the LC resonant network. The LC resonant tank then selects an AC component of a specific frequency (determined by the values ​​of inductor L and capacitor C) for AC output.

[0079] In summary, the embodiments of the present invention have the following improvements over the prior art:

[0080] 1) The control method and resonant network selection of each unit can be customized according to actual needs without affecting other units. This modular unit design provides excellent scalability, and the number and characteristics of input and output ports can be easily customized.

[0081] 2) To address the issue of cross-influence, the second stage uses a series connection of CSM units. That is, the CSM units from output port 1 to output port n are connected in series. The input current of the output unit is transmitted between each CSM unit and remains stable. It will not change due to factors such as the load of individual output ports. Therefore, each output port is independent of each other and will not produce cross-influence.

[0082] 3) In order to solve the problem of single output form, an LC parallel resonance tank is added after the CSM unit to select the frequency to generate AC output instead of being limited to DC output. Figure 3 Taking output port 1 as an example, when the LC tank is in operation, by setting the values ​​of L1 and C1 as needed, you can select AC power of a specific frequency, thereby obtaining AC output. If the LC tank is in the non-operating state, the output port maintains DC output.

[0083] Finally, it should be noted that Figure 5 As shown, when the first and second output ports work in AC output mode, and the third output port works in DC output mode, the output waveform is as follows: Figure 5 As shown, I mid Keeping constant, the output voltage waveforms of the first output port and the second output port are in AC form, such as Figure 5 v in o,1 、v o,2 , the output voltage waveform of the third output port is in DC form, such as Figure 5 V o,3 .

[0084] like Figure 6 As mentioned above, when the second output port is switched to DC output mode, the output voltage waveform becomes DC form, such as Figure 6 Medium V o,2 .

[0085] like Figure 7 As shown in Figure 1, when the load of the third output port changes suddenly, the outputs of the remaining ports remain stable and are not affected by the crosstalk.

[0086] It can be understood that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0087] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A multi-input-output converter with AC / DC output, characterized in that: The converter comprises a first-stage input port and a second-stage output port, wherein the output end of the first-stage input port is connected to the input end of the second-stage output port, wherein: The first-stage input port includes a plurality of input voltage sources and a plurality of voltage source mode units, wherein the plurality of input voltage sources are used to supply power to the plurality of voltage source mode units, and the plurality of voltage source mode units are used to provide a stable controlled inductor current to the second-stage output port; The second-stage output port includes a plurality of current source mode units and a plurality of LC resonant tanks. The output ends of the plurality of current source mode units are connected one-to-one with the input ends of the plurality of LC resonant tanks. The plurality of LC resonant tanks are connected one-to-one with the plurality of electrical devices. The plurality of current source mode units are connected in series. The plurality of current source mode units are used to generate electrical energy in a direct current form. The plurality of LC resonant tanks are used to convert the electrical energy in a direct current form generated by the plurality of current source mode units into electrical energy in an alternating current form.

2. The converter according to claim 1, characterized in that The voltage source mode unit includes several first switching devices, a first energy storage inductor element and several diode elements. The first end of the first switching device is connected to the positive end of the input voltage source, the second end of the first switching device and the first end of the first energy storage inductor element are connected to the negative end of the diode element, the positive end of the diode element is connected to the negative end of the input voltage source, the second end of the first energy storage inductor element is connected to the input end of the current source mode unit, and the energy storage inductor element is shared by several of the voltage source mode units.

3. The converter according to claim 1, wherein: The current source mode unit includes several second switching devices, several third switching devices and an energy storage capacitor element. The first end of the second switching device and the first end of the third switching device are connected to the output end of the voltage source mode unit, the second end of the second switching device is connected to the second end of the energy storage capacitor element, and the second end of the third switching device is connected to the first end of the energy storage capacitor element.

4. The converter according to claim 1, wherein The LC resonant tank includes several energy storage capacitor elements, several second energy storage inductor elements and several fourth switching devices, the first end of the energy storage capacitor element is connected to the first end of the second energy storage inductor element, the second end of the energy storage capacitor element is connected to the second end of the fourth switching device, and the second end of the second energy storage inductor element is connected to the first end of the fourth switching device.

5. A control method for a multi-input-output converter with AC / DC output, characterized in that: The method comprises the following steps: Sampling the inductor current and performing constant current control on several voltage source mode units at the first-stage input port to output a stable controlled inductor current; generating a control signal according to the stable controlled inductor current to directly control the duty cycle of the second-stage output port; The output mode of the converter is controlled by controlling the opening and closing of the fourth switch device.

6. The method according to claim 5, characterized in that The sampling and obtaining of the inductor current and the constant current control of the plurality of voltage source mode units at the first-stage input port to output a stable controlled inductor current include: Acquire the inductor current by a current sampling method and set a standard reference current; performing a difference calculation on the inductor current and the reference current to obtain a current error signal; Performing proportional integral calculation on the current error signal and comparing the result through a comparator to obtain a first switch device control signal; The on-off state of the first switching device is controlled by the first switching device control signal to output the stable controlled inductor current.

7. The method according to claim 5, characterized in that Generating a control signal according to the stable controlled inductor current to directly control the duty cycle of the second-stage output port includes: Comparing the stable controlled inductor current with the current of the second-stage output port, and setting a reference voltage signal and a sawtooth voltage signal; Inputting the reference voltage signal and the sawtooth wave voltage signal into a comparator for comparison to obtain a switching signal; The on-off states of the second switching device and the third switching device are controlled by the switching signal, so that the second-stage output port generates a desired output current.

8. The method according to claim 5, characterized in that The step of controlling the output mode of the converter by controlling the opening and closing of the fourth switch device includes: If the fourth switch device is in an off state, the converter outputs DC power; If the fourth switch device is in a closed state, the converter outputs AC power.

9. The method according to claim 8, characterized in that Also includes: When the fourth switch device is in a closed state, the LC resonant tank enters a working state; By setting the values ​​of the energy storage capacitor element and the second energy storage inductor element, the converter outputs AC power with a target preset frequency.

10. The method according to claim 5, characterized in that Also includes: Selecting an input voltage source and connecting it to a first-stage input port, and configuring multiple second-stage output ports so that the converter is in a single-input multiple-output mode; Selecting multiple input voltage sources and correspondingly connecting them to multiple first-stage input ports, and configuring a second-stage output port, so that the converter is in a multi-input single-output mode; A plurality of input voltage sources are selected and connected to a plurality of first-stage input ports accordingly, and a plurality of second-stage output ports are configured, so that the converter is in a multi-input multi-output mode.

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