A multifunctional bidirectional DC conversion module and a modular power supply based on this module

Abstract

The present invention relates to a multifunctional bidirectional DC conversion module and a modular power supply based on the module. The bidirectional DC conversion module includes a first conversion unit, an isolation transformer, a second conversion unit, and a driving unit. The first conversion unit includes a first input side, a first output side, a capacitor C1, switching tubes Q1-Q4, and an inductor L1. The second conversion unit includes a second input side, a second output side, a capacitor C2, switching tubes Q5-Q8, and an inductor L2. The control ends of the switching tubes Q1-Q8 are connected to the driving unit. The driving unit is used to send trigger signals to the switching tubes Q1-Q8 to control the working timing of the switching tubes Q1-Q8. By using the same hardware platform of the multifunctional bidirectional module, the types of hardware devices can be reduced, thereby reducing the development and production difficulties, saving costs, and facilitating the reduction of the maintenance and management difficulties. Different functions can be realized through the driving unit, improving the versatility of the device and the utilization rate of the device.

Description

Technical Field

[0001] The present application relates to the technical field of power supplies, and particularly to a multifunctional bidirectional DC conversion module and a modular power supply based on the multifunctional bidirectional module. Background Art

[0002] A modular switched-mode power supply (SMPS), also known as a modular power supply or a switched-mode power supply, is a high-frequency power conversion device and a type of power supply. Its function is to convert a voltage level into the voltage or current required by the user through different forms of architectures. Most of the inputs of traditional switched-mode power supplies are AC power (such as mains power) or DC power, and the output is the required DC power.

[0003] Currently, in addition to mainly using the traditional method of introducing mains power and using a battery for backup power, for switched-mode power supplies used in communications, power supply from photovoltaic cells, green power supply such as wind turbine power supply, and the combined use of energy storage batteries and backup batteries to earn the price difference between peak and valley electricity prices to reduce costs are gradually becoming the research and development directions for switched-mode power supplies used in communications. Currently, modular switched-mode power supplies achieve the above non-traditional functions by integrating DC conversion modules (hereinafter referred to as DC-DC modules) with different functions. For example, by integrating a boost DC-DC module to supply power to communication equipment with a high voltage level, by integrating a photovoltaic cell DC-DC access module to achieve the access of photovoltaic cells, by integrating a wind turbine DC-DC module to achieve the access of DC fans, by integrating a buck DC-DC module to supply power to equipment with a low voltage level, and by integrating multiple bidirectional DC-DC battery sharing manager modules to achieve the function of a battery sharing manager, etc. The voltage levels of the above various DC-DC modules with different functions are different, some are unidirectional DC-DC, and some are bidirectional DC-DC. Different device standards result in a large number of devices, high manufacturing costs, poor device versatility, a large number of protocols between devices, difficult development, difficult management due to a large number of device types, low utilization rate due to device non-universality, and the module being idle after some functions are not used. Summary of the Invention

[0004] In view of the above problems, the present application provides a multifunctional bidirectional DC conversion module and a modular switched-mode power supply system, which solve the problems of high cost, poor versatility, and a large number of protocols between devices and difficult development when different DC-DC module devices are required due to different device standards of existing different DC-DC modules.

[0005] To achieve the above object, the inventor provides a multifunctional bidirectional DC conversion module, including a first conversion unit, an isolation transformer, a second conversion unit, and a driving unit;

[0006] The first conversion unit includes a first input side, a first output side, a capacitor C1, switching transistors Q1 - Q4, and an inductor L1. The capacitor C1 is disposed between the positive and negative electrodes of the first input side. The source electrode of the switching transistor Q1 is connected to the positive electrode of the first input side, and the drain electrode of the switching transistor Q1 is connected to one end of the inductor L1. The source electrode of the switching transistor Q2 is connected to one end of the inductor L1, and the drain electrode of the switching transistor Q2 is connected to the negative electrode of the first input side. The source electrode of the switching transistor Q3 is connected to the other end of the inductor L1, and the drain electrode of the switching transistor Q3 is connected to the negative electrode of the first output side. The source electrode of the switching transistor Q4 is connected to the positive electrode of the first output terminal, and the drain electrode of the switching transistor Q4 is connected to the other end of the inductor L1. The first output side is connected to one side of the isolation transformer;

[0007] The second conversion unit includes a second input side, a second output side, a capacitor C2, switching transistors Q5 - Q8, and an inductor L2. The capacitor C2 is disposed between the positive and negative electrodes of the second output side. The source electrode of the switching transistor Q5 is connected to the positive electrode of the second input side, and the drain electrode of the switching transistor Q5 is connected to one end of the inductor L2. The source electrode of the switching transistor Q6 is connected to one end of the inductor L2, and the drain electrode of the switching transistor Q6 is connected to the negative electrode of the second input side. The source electrode of the switching transistor Q7 is connected to the other end of the inductor L2, and the drain electrode of the switching transistor Q7 is connected to the negative electrode of the second output side. The source electrode of the switching transistor Q8 is connected to the positive electrode of the second output terminal, and the drain electrode of the switching transistor Q8 is connected to the other end of the inductor L2. The second input side is connected to the other side of the isolation transformer;

[0008] The control terminals of the switching transistors Q1 - Q8 are connected to the drive unit;

[0009] The drive unit is configured to send trigger signals to the switching transistors Q1 - Q8 to control the working timing of the switching transistors Q1 - Q8.

[0010] Further optimization: The switching transistor is a MOS transistor, and it can also be a triode, an IGBT transistor, etc. The materials include silicon dioxide, gallium nitride, silicon carbide, etc.

[0011] Further optimization: The drive unit is further configured to control the duty cycle of the switching transistors Q1 - Q8.

[0012] Further optimization: When the drive unit is for forward power supply, it controls the working timing of the switching transistors Q1 - 4 to be about 5 / 4 cycles ahead of that of the switching transistors Q5 - 8. When it is for reverse power supply, the working timing of the switching transistors Q1 - 4 is about 5 / 4 cycles behind that of the switching transistors Q5 - 8. The leading or lagging cycles can be adjusted according to the resistive, capacitive, and inductive characteristics of the load.

[0013] Another technical solution is also provided, which is a modular switching power supply based on a multi-functional bidirectional DC conversion module, including an AC input module, a rectification module, a DC bus power distribution module, a multi-functional bidirectional DC conversion module, a DC power distribution unit and a monitoring module.

[0014] The AC input module is connected to the DC bus power distribution module through the rectification module;

[0015] The multi-functional bidirectional DC conversion module is connected to the DC bus power distribution module. There are multiple multi-functional bidirectional DC conversion modules, which are respectively used for photovoltaic access, wind turbine access and starting as a battery sharing manager. The multi-functional bidirectional DC conversion module is the above-mentioned multi-functional bidirectional DC conversion module

[0016] The DC power distribution unit module is connected to the DC bus power distribution module to provide working power for communication equipment;

[0017] The monitoring module is used to monitor and control the rectification module, the multi-functional bidirectional DC conversion module and the DC power distribution module to work under various working conditions;

[0018] The monitoring module is used to supply power to the communication equipment through the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access when the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access reaches the first preset voltage value. When the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access drops to the second preset voltage value, the multi-functional bidirectional DC conversion module used as a battery sharing manager is started, and the communication equipment is powered through the multi-functional bidirectional DC conversion modules used for photovoltaic access, wind turbine access and battery sharing manager. When the output voltage of the multi-functional bidirectional DC conversion module used as a battery sharing manager drops to the third preset voltage value, the multi-functional bidirectional DC conversion module used as a battery sharing manager is turned off, the rectification module is started, and the communication equipment is powered through the multi-functional bidirectional DC conversion modules used for photovoltaic access and wind turbine access and the rectification module. The first preset voltage value is greater than the second preset voltage value, and the second preset voltage value is greater than the third preset voltage value.

[0019] For further optimization, the monitoring module is also used to detect the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access or wind turbine access. If the voltage is greater than the fourth preset voltage value, the multi-functional bidirectional DC conversion module used as a battery sharing manager charges the battery module in reverse. The fourth preset voltage value is greater than the first preset voltage value.

[0020] For further optimization, it further includes an inverter module and a public grid connection module. The input end of the public grid connection module is connected to the DC bus distribution module through the inverter module. The output end of the public grid connection module is connected to the municipal power grid. The control end of the inverter module is connected to the monitoring module;

[0021] The monitoring module is further configured to control the inverter module to work to convert the direct current generated by the photovoltaic power module and the DC fan power module into alternating current and supply power to the municipal power grid through the public grid connection module when it detects that the output voltage of the multifunctional bidirectional DC conversion module used for photovoltaic access or fan access is greater than the fifth preset voltage value.

[0022] For further optimization, the same battery pack is connected to the DC bus distribution module through the same multifunctional bidirectional DC conversion module used as a battery sharing manager, and different battery packs are connected to the DC bus distribution module through different multifunctional bidirectional DC conversion modules used as battery sharing managers.

[0023] For further optimization, the monitoring module includes a detection unit, a display interface and an input keyboard. The detection unit is used to detect the voltage and current of the output electric energy of all multifunctional bidirectional DC conversion modules, and the voltage, current and frequency of the rectification module and the inverter module. The display interface is used to display the working conditions of the rectification module, the multifunctional bidirectional DC conversion module and the inverter module. The input keyboard is used to set the working states of the monitoring module, the multifunctional bidirectional DC conversion module, the rectification module and the inverter module.

[0024] For further optimization, the monitoring module further includes a communication interface, and the communication interface is used for power environment monitoring communication or remote communication.

[0025] Different from the prior art, the above technical solution provides a multifunctional bidirectional DC conversion module, which is a bidirectional DC conversion module with wide voltage input and adjustable wide voltage output. Different functions can be set and realized through a driving unit. Voltage isolation is carried out between the first conversion unit and the second conversion unit of the multifunctional bidirectional DC conversion module through an isolation transformer, that is, voltage isolation is carried out between the input end and the output end of the multifunctional bidirectional conversion module, and the output is a voltage floating with respect to the ground, which can be used for high-voltage DC remote power supply and can block part of the lightning current or surge current. The multifunctional bidirectional DC conversion module adopts two-stage conversion, and compared with the traditional single-stage conversion, the voltage conversion ability is greatly improved. The first conversion unit and the second conversion unit are connected through an isolation transformer and are arranged in a mirror image. The first conversion unit includes switch tubes Q1, Q2, Q3, Q4, capacitor C1 and inductor L1, and the second conversion unit includes switch tubes Q5, Q6, Q7, Q8, capacitor C2 and inductor L2; when electric energy is transferred from the first input side to the first output side, then transferred to the second input side through the isolation transformer, and then transferred to the second output side, it is called forward power supply, and when electric energy is transferred from the second output side to the second input side, then transferred to the first output side through the isolation transformer, and then transferred to the first input side, it is called reverse power supply. Among them, the driving unit controls the working sequence of switch tubes Q1-Q8 to realize the control of the direction of electric energy transfer; through a unified hardware platform, the types of hardware devices can be reduced, thereby reducing the development and production difficulty and saving costs. The same hardware device platform is beneficial to reducing the maintenance and management difficulty. Different functions can be realized through the driving unit, improving the versatility of the device and the utilization rate of the device.

[0026] The above description of the invention content is only an overview of the technical solution of this application. In order to enable those of ordinary skill in the art to more clearly understand the technical solution of this application, and then can be implemented according to the content recorded in the text of the specification and the drawings, and in order to make the above objects, other objects, features and advantages of this application more easily understood, the following is described in conjunction with the specific implementation manners and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are only used to illustrate the principles, implementation manners, applications, features and effects of the specific implementation manners of this application and other related contents, and should not be considered as a limitation to this application.

[0028] In the accompanying drawings of the specification:

[0029] Figure 1 is a circuit schematic diagram of the multifunctional bidirectional DC conversion module described in the specific implementation manner;

[0030] Figure 2 is a working timing diagram of the first conversion unit for forward power supply described in the specific implementation manner;

[0031] Figure 3 The working timing diagram for the forward power supply of the second conversion unit described in the specific implementation manner;

[0032] Figure 4 The working timing diagram for the reverse power supply of the second conversion unit described in the specific implementation manner

[0033] Figure 5 The working timing diagram for the reverse power supply of the first conversion unit described in the specific implementation manner;

[0034] Figure 6 The structural schematic diagram of a modular switching power supply based on a multi-functional bidirectional DC module described in the specific implementation manner.

[0035] The descriptions of the reference numerals involved in the above-mentioned drawings are as follows:

[0036] 100, monitoring module; 101, DC busbar power distribution module; 110, AC input module; 111, rectification module; 120, photovoltaic cell; 121, multi-functional bidirectional DC conversion module used as a photovoltaic cell access module; 130, DC fan; 131, multi-functional bidirectional DC conversion module used as a DC fan access module; 140, storage battery; 141, multi-functional bidirectional DC conversion module used as a battery sharing manager; 150, low-voltage level equipment; 151, multi-functional bidirectional DC conversion module used as a low-voltage module; 160, high-voltage DC equipment; 161, multi-functional bidirectional DC conversion module used as a 240 - 380V high-voltage module; 170, 57 - 72V mobile communication equipment; 171, multi-functional bidirectional DC conversion module used as a 57 - 72V boost module; 180, 48V communication equipment; 181, intelligent DC power distribution unit; 190, public grid connection module; 191, inversion module. Specific implementation manner

[0037] To describe in detail the possible application scenarios, technical principles, implementable specific solutions, achievable purposes and effects, etc. of the present application, the following will be described in detail in combination with the listed specific embodiments and with reference to the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0038] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the meanings of the technical terms used in this document are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of the relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0040] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this document generally represents an "or" logical relationship between the associated objects before and after.

[0041] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary, or sequential relationship between these entities or operations.

[0042] Without further limitation, in this application, the expressions "including", "comprising", "having", or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method, or product including the said elements, so that a process, method, or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method, or product.

[0043] The same as the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the number itself; expressions such as "above", "below", "within", etc. are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two), and similar expressions related to "many" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise specifically defined.

[0044] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings. It is only for the convenience of describing the specific embodiments of the present application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0045] Unless otherwise clearly specified or limited, in the description of the embodiments of the present application, the terms such as "installed", "connected", "coupled", "fixed", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0046] Please refer to Figure 1 , this embodiment provides a multifunctional bidirectional DC conversion module, including a first conversion unit, an isolation transformer M, a second conversion unit, and a driving unit;

[0047] The first conversion unit includes a first input side, a first output side, a capacitor C1, switching tubes Q1 - Q4, and an inductor L1. The capacitor C1 is disposed between the positive and negative poles of the first input side. The source of the switching tube Q1 is connected to the positive pole of the first input side, and the drain of the switching tube Q1 is connected to one end of the inductor L1; the source of the switching tube Q2 is connected to one end of the inductor L1, and the drain of the switching tube Q2 is connected to the negative pole of the first input side; the source of the switching tube Q3 is connected to the other end of the inductor L1, and the drain of the switching tube Q3 is connected to the negative pole of the first output side; the source of the switching tube Q4 is connected to the positive pole of the first output side, and the drain of the switching tube Q4 is connected to the other end of the inductor L1. The first output side is connected to one side of the isolation transformer M;

[0048] The second conversion unit includes a second input side, a second output side, a capacitor C2, switching transistors Q5-Q8, and an inductor L2. The capacitor C2 is disposed between the positive and negative electrodes of the second output side. The source electrode of the switching transistor Q5 is connected to the positive electrode of the second input side, and the drain electrode of the switching transistor Q5 is connected to one end of the inductor L2. The source electrode of the switching transistor Q6 is connected to one end of the inductor L2, and the drain electrode of the switching transistor Q6 is connected to the negative electrode of the second input side. The source electrode of the switching transistor Q7 is connected to the other end of the inductor L2, and the drain electrode of the switching transistor Q7 is connected to the negative electrode of the second output side. The source electrode of the switching transistor Q8 is connected to the positive electrode of the second output terminal, and the drain electrode of the switching transistor Q8 is connected to the other end of the inductor L2. The second input side is connected to the other side of the isolation transformer M.

[0049] The control terminals of the switching transistors Q1-Q8 are connected to the driving unit.

[0050] The driving unit is configured to send trigger signals to the switching transistors Q1-Q8 to control the working timing of the switching transistors Q1-Q8.

[0051] This module is a DC conversion module with bidirectional wide-voltage input and wide-voltage adjustable output. Different functions can be set and implemented through the drive unit. Voltage isolation is carried out between the first conversion unit and the second conversion unit of the multifunctional bidirectional DC conversion module through the isolation transformer M, that is, the voltage between the input terminal and the output terminal of the multifunctional bidirectional conversion module is isolated, and the output is a voltage floating with respect to the ground. It can be used for high-voltage DC remote power supply and can block part of the lightning current or surge current. The multifunctional bidirectional DC conversion module adopts two-stage conversion. Compared with the traditional single-stage conversion, the voltage conversion ability is greatly improved. The first conversion unit and the second conversion unit are connected through the isolation transformer M and are arranged in a mirror image. The first conversion unit includes switch tubes Q1, Q2, Q3, Q4, capacitor C1 and inductor L1. The second conversion unit includes switch tubes Q5, Q6, Q7, Q8, capacitor C2 and inductor L2. When electric energy is transmitted from the first input side to the first output side, then transmitted to the second input side through the isolation transformer M, and then transmitted to the second output side, it is called forward power supply. When electric energy is transmitted from the second output side to the second input side, then transmitted to the first output side through the isolation transformer M, and then transmitted to the first input side, it is called reverse power supply. Among them, the drive unit controls the working sequence of switch tubes Q1-Q8 to control the direction of electric energy transmission. The multifunctional bidirectional DC conversion module can supply power in forward boost, buck, and regulated modes, and can also supply power in reverse boost, buck, and regulated modes, and can achieve bidirectional power supply at different times. The output of the multifunctional bidirectional DC conversion module is a voltage floating with respect to the ground and can be used for high-voltage DC remote power supply. By using the same hardware platform, the types of hardware devices can be reduced, thereby reducing the development and production difficulty, saving costs, and being beneficial to reducing the maintenance and management difficulty. Different functions can be achieved through the drive unit, improving the versatility of the device and the utilization rate of the device.

[0052] Please refer to Figures 2-3 , when forward power supply of the module is required, within a cycle t from a few microseconds to dozens of microseconds, the trigger signal of the drive unit first conducts switch tubes Q1 and Q3 simultaneously to store energy in inductor L1, and then conducts switch tubes Q2 and Q4 simultaneously to release the energy stored in inductor L1 to the second conversion module through the isolation transformer M. Similarly, within a cycle t from a few microseconds to dozens of microseconds, the trigger signal of the drive unit first conducts switch tubes Q5 and Q7 simultaneously to store energy in inductor L2, and then conducts switch tubes Q6 and Q8 simultaneously to output electric energy after filtering through capacitor C2, and the multifunctional bidirectional DC conversion module can supply forward power.

[0053] Please check Figures 4-5, when reverse power supply of the module is required, within a cycle t of several microseconds to dozens of microseconds, the trigger signal of the drive unit first turns on the switching tubes Q6 and Q8 simultaneously to store energy in the inductor L2, and then turns on the switching tubes Q5 and Q7 simultaneously to release the energy stored in the inductor L2 to the first conversion module through the isolation transformer M. Similarly, within a cycle t of several microseconds to dozens of microseconds, the trigger signal of the drive unit first turns on the switching tubes Q2 and Q4 simultaneously to store energy in the inductor L1, and then turns on the switching tubes Q1 and Q3 simultaneously to output electrical energy after filtering through the capacitor C1. The multi-functional bidirectional DC conversion module can perform reverse power supply.

[0054] In some embodiments, when the drive unit is used for forward power supply, the working timing of the switching tubes Q1-4 is about 5 / 4 cycles ahead of that of the switching tubes Q5-8. When performing reverse power supply, the working timing of the switching tubes Q1-4 is about 5 / 4 cycles behind that of the switching tubes Q5-8. The leading or lagging cycles can be adjusted according to the characteristics of the load being resistive, capacitive, or inductive. The simplex forward and reverse power supply of the same module in different time periods is called bidirectional power supply.

[0055] In some embodiments, the switching tube is a MOS tube. MOS is the abbreviation of MOSFET. MOSFET is Metal-Oxide-Semiconductor Field-Effect Transistor, also known as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). In other embodiments, the switching tube can also be a triode, IGBT tube, etc., and the materials include silicon dioxide, gallium nitride, silicon carbide, etc. IGBT (Insulated Gate Bipolar Transistor) is a composite fully controlled voltage-driven power semiconductor device composed of BJT (bipolar junction transistor) and MOS (insulated gate field effect transistor), and has the advantages of both the high input impedance of MOSFET and the low on-state voltage drop of GTR.

[0056] In some embodiments, the driving unit is further configured to control the duty cycles of switching transistors Q1 - Q8. The driving unit is configured to control the boost, buck, or voltage regulation of the multi-functional bidirectional DC conversion module by controlling the duty cycles of switching transistors Q1 - Q8. In the operating condition where the multi-functional bidirectional DC conversion module can supply power in the forward direction, the duty cycle D of MOS transistors Q1 - Q8 within the t period is adjusted. When D is greater than 50%, the output voltage V2 on the first output side is greater than the input voltage V1 on the first input side, and the module operates in the boost state; when D is less than 50%, the output voltage V2 on the first output side is less than the input voltage V1 on the first input side, and the module operates in the buck state; when D is equal to 50%, the output voltage V2 on the first output side is equal to the input voltage V1 on the first input side, and the module is in the voltage regulation state. The voltage V2 is determined according to the power consumption voltage requirement, and the voltage V2 = V1 * D / (1 - D). When D is greater than 50%, the output voltage V4 on the second output side is greater than the input voltage V3 on the second input side, and the module operates in the boost state; when D is less than 50%, the output voltage V4 on the second output side is less than the input voltage V3 on the second input side, and the module operates in the buck state; when D is equal to 50%, the output voltage V4 on the second output side is equal to the input voltage V3 on the second input side, and the module is in the voltage regulation state. The voltage V4 is determined according to the power consumption voltage requirement, and the voltage V4 = V3 * D / (1 - D). V4 = V1 * D2 / (1 - D)2.

[0057] In the operating condition where the multi-functional bidirectional DC conversion module can supply power in the reverse direction, the duty cycle D of the MOS transistors within the t period is adjusted. When D is greater than 50%, the output voltage V1 on the first input side is greater than the input voltage V2 on the first output side, and the module operates in the boost state; when D is less than 50%, the output voltage V1 on the first input side is less than the input voltage V2 on the first output side, and the module operates in the buck state; when D is equal to 50%, the output voltage V1 on the first input side is equal to the input voltage V2 on the first output side, and the module is in the voltage regulation state. The voltage V1 is determined according to the power consumption voltage requirement, and the voltage V1 = V2 * D / (1 - D). When D is greater than 50%, the output voltage V3 on the second input side is greater than the input voltage V4 on the second output side, and the module operates in the boost state; when D is less than 50%, the output voltage V3 on the second input side is less than the input voltage V4 on the second output side, and the module operates in the buck state; when D is equal to 50%, the output voltage V3 on the second input side is equal to the input voltage V4 on the second output side, and the module is in the voltage regulation state. The voltage V3 is determined according to the power consumption voltage requirement, and the voltage V3 = V4 * D / (1 - D). V1 = V4 * D2 / (1 - D)2.

[0058] Please refer to Figure 6, In another embodiment, a modular switching power supply based on a multi-functional bidirectional DC conversion module. This system can operate in an off-grid state or a grid-connected state. When in the off-grid working state, the switching power supply can be connected to green energy sources such as solar energy and wind energy to supply power to a 48V communication device 180, and can store energy through a storage battery 140. In the absence of solar energy and wind energy, the storage battery 140 outputs electrical energy to supply power to the 48V communication device 180. A large amount of green energy is used for equipment power supply to achieve energy conservation and carbon reduction. When in the grid-connected working state, green energy sources such as solar energy and wind energy are preferentially used to supply power to the 48V communication device 180, and energy can be stored through the storage battery 140. In the absence of solar energy and wind energy, the storage battery 140 outputs electrical energy to supply power to the 48V communication device 180. When the energy in the green energy source and the storage battery 140 is exhausted, mains power is used for power supply. When the green energy is sufficient and the storage battery 140 is fully charged, the green energy can be inverted into alternating current to supply power to the power grid, ultimately achieving energy conservation and carbon reduction. When there is no green energy or the green energy is insufficient, this system can also use the multi-functional bidirectional DC conversion module as a battery sharing manager 141 to charge and store energy in the storage battery 140 during the low electricity price period, supply power to the 48V communication device 180 during the peak electricity price period, or supply power to the power grid through an inverter module 191 and a grid connection module 190 to achieve peak shaving and valley filling and reduce the electricity cost.

[0059] Specifically, a modular power supply based on a multi-functional bidirectional module includes a monitoring module 100, a DC bus distribution module 101, an AC input module 110, a rectification module 111, a multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121, a multi-functional bidirectional DC conversion module used as a DC fan access module 131, a multi-functional bidirectional DC conversion module used as a battery sharing manager 141, a multi-functional bidirectional DC conversion module used as a low voltage module 151, a multi-functional bidirectional DC conversion module used as a 240 - 380V high voltage module 161, a multi-functional bidirectional DC conversion module used as a 57 - 72V boost module 171, an intelligent DC distribution unit 181, a public grid connection module 190, and an inverter module 191. In the above system, the monitoring module 100, the DC bus distribution module 101, and the intelligent DC distribution unit 181 are necessary configurations, and the remaining modules are configured with one or more as required.

[0060] The AC input module 110 is connected to the DC bus distribution module 101 through the rectification module 111;

[0061] The photovoltaic cell 120 is connected to the DC bus distribution module 101 through the multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121;

[0062] The DC fan 130 is connected to the DC bus distribution module 101 through the multi-functional bidirectional DC conversion module used as a DC fan access module 131;

[0063] The storage battery 140 is connected to the DC busbar power distribution module 101 through the multi-functional bidirectional DC conversion module used as the battery sharing manager 141;

[0064] The intelligent DC power distribution unit 181 is connected to the DC busbar power distribution module 101 and is used to provide a working power supply for the 48V communication device 180;

[0065] The monitoring module 100 is communicatively connected to the rectification module 111, the multi-functional bidirectional DC conversion module used as the photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module used as the DC fan access module 131, the multi-functional bidirectional DC conversion module used as the battery sharing manager 141, the multi-functional bidirectional DC conversion module used as the low voltage module 151, the multi-functional bidirectional DC conversion module used as the 240 - 380V high voltage module 161, the multi-functional bidirectional DC conversion module used as the 57 - 72V boost module 171, the intelligent DC power distribution unit 181, and the inverter module 191.

[0066] Among them, the multi-functional bidirectional DC conversion module is the multi-functional bidirectional DC conversion module in the above-mentioned embodiment.

[0067] The electric energy generated by the photovoltaic cell 120 and the DC fan 130 is converted by the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121 and the multi-functional bidirectional DC conversion module as the DC fan access module 131 and then transmitted to the DC bus distribution module 101. Then, it is supplied to each 48V communication device 180 through the intelligent DC distribution unit 181. The monitoring module 100 monitors the working conditions of the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121 and the multi-functional bidirectional DC conversion module as the DC fan access module 131. When the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121 and the multi-functional bidirectional DC conversion module as the DC fan access module 131 are working normally and the output voltage thereof reaches near the first preset voltage value, the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121 and the multi-functional bidirectional DC conversion module as the DC fan access module 131 supply power to the 48V communication device 180 through the DC bus distribution module 101; when the output electric energy of the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121 and the multi-functional bidirectional DC conversion module as the DC fan access module 131 is insufficient and the voltage gradually decreases, when the output voltage is lower than the second preset voltage value, the multi-functional bidirectional DC conversion module as the battery sharing manager 141 is started, and the multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module as the DC fan access module 131 and the multi-functional bidirectional DC conversion module as the battery sharing manager 141 jointly supply power to the 48V communication device 180. As the discharge time of the storage battery 140 increases, the voltage continuously decreases. When the output voltage of the multi-functional bidirectional DC conversion module as the battery sharing manager 141 is lower than the third preset voltage, the multi-functional bidirectional DC conversion module as the battery sharing manager 141 is turned off, and the rectification module 111 is started. The multi-functional bidirectional DC conversion module as the photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module as the DC fan access module 131 and the rectification module 111 supply power to the 48V communication device 180. The first preset voltage value is greater than the second preset voltage value, and the second preset voltage value is greater than the third preset voltage value. By connecting the photovoltaic cell 120 and the DC fan 130 to supply power to the 48V communication device 180, the burden on the commercial power is reduced, and at the same time, the carbon dioxide emission of the base station is reduced.

[0068] Among them, the modular power supply based on the multi-functional bidirectional DC conversion module does not need to adopt different DC-DC modules. Through the same hardware platform, the types of hardware devices can be reduced, thereby reducing the development and production difficulties, saving costs, facilitating the reduction of the maintenance and management difficulties. Different functions can be realized through the drive unit, improving the versatility of the device and the utilization rate of the device.

[0069] Specifically, when the multi-functional bidirectional DC conversion module is used as the photovoltaic cell access module 121 to supply power to the switching power supply, the module needs to be set to work in the reverse power supply mode. When the voltage of the photovoltaic cell is lower than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value greater than 50%; when the voltage of the photovoltaic cell is higher than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value less than 50%. The specific value of the duty ratio D satisfies V1 / V4 = D2 / (1-D)2.

[0070] When the multi-functional bidirectional DC conversion module is used as the DC fan access module 131 to supply power to the switching power supply, the module needs to be set to work in the reverse power supply mode. When the voltage of the DC fan is lower than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value greater than 50%; when the voltage of the DC fan is higher than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value less than 50%. The specific value of the duty ratio D satisfies V1 / V4 = D2 / (1-D)2.

[0071] When the multi-functional bidirectional DC conversion module is used as the battery sharing manager 141, there are two working conditions: the sub-battery supplies power to the switching power supply and the switching power supply charges the battery. When the battery 140 supplies power to the switching power supply, the module needs to be set to work in the reverse power supply mode. When the voltage of the battery 140 is lower than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value greater than 50%; when the voltage of the battery 140 is higher than the voltage of the set access DC bus distribution module 101, the duty ratio D of the MOS tube can be adjusted to a certain value less than 50%. The specific value of the duty ratio D satisfies V1 / V4 = D2 / (1-D)2. When the switching power supply charges the battery 140, the module needs to be set to work in the forward power supply mode. When the voltage of the switching power supply is lower than the charging voltage of the battery, the duty ratio D of the MOS tube can be adjusted to a certain value greater than 50%; when the voltage of the switching power supply is higher than the charging voltage of the battery, the duty ratio D of the MOS tube can be adjusted to a certain value less than 50%. The specific value of the duty ratio D satisfies V1 / V4 = D2 / (1-D)2.

[0072] When the multi-functional bidirectional DC conversion module is used to boost the voltage for powering high-voltage-level equipment, the module needs to be set to operate in the forward power supply mode. By adjusting the duty cycle D of the MOS transistor to a value greater than 50%, the specific value of the duty cycle D satisfies V1 / V4 = D2 / (1 - D)2. For example, when powering a 57 - 72V mobile communication device 170 (such as a 5G AAU device), the multi-functional bidirectional DC conversion module can be used as a 57 - 72V boost module 171; it can also be used as a 240 - 750V high-voltage module 161, which can be used for high-voltage DC equipment 160 commonly used in edge computing servers with voltages ranging from 240 - 380V or high-voltage DC equipment 160 with voltages from 240V to 750V, such as high-voltage DC remote power supply from 240V to 750V to power other base station equipment.

[0073] When the multi-functional bidirectional DC conversion module reduces the output voltage to power low-voltage-level equipment 150, the module needs to be set to operate in the forward power supply mode. By adjusting the duty cycle D of the MOS transistor to a value less than 50%, the specific value of the duty cycle D satisfies V1 / V4 = D2 / (1 - D)2. For example, when powering a 12 / 24 / 36V low-voltage-level equipment 150 (such as a camera, 24V base station), the multi-functional bidirectional DC conversion module can be used as a low-voltage module 151.

[0074] Specifically, the monitoring module presets N groups of preset voltage values according to the service logic. In this embodiment, five groups of preset values are adopted. The monitoring module 100 sets the output voltages of the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 to 55.5V, that is, sets the first preset voltage value to 55.5V. When the voltages output by the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 are stabilized at 55.5V, the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 are used to supply power to the 48V communication device 180. And the output voltage of the multifunctional bidirectional DC conversion module used as the battery sharing manager 141 is set to 53.5V, that is, the second preset voltage value is 53.5V. When the electric energy generated by the photovoltaic cell 120 and the DC fan 130 is insufficient, the output voltages of the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 will drop from 55.5V to below 53.5V. At this time, the control module starts the multifunctional bidirectional DC conversion module used as the battery sharing manager 141, and the storage battery 140, the photovoltaic cell 120 and the DC fan 130 are used to jointly supply power to the 48V communication device 180. The monitoring module 100 sets the voltage threshold for starting the rectification module 111 to 47V, that is, the third preset voltage value is 47V. When powered by the storage battery 140, when the output voltage of the multifunctional bidirectional DC conversion module used as the battery sharing manager 141 drops below 47V, the rectification module 111 is started to supply power to the 48V communication device 180 through the AC input module 110. If the photovoltaic cell 120 and the DC fan 130 can still generate electric energy, the photovoltaic cell 120, the DC fan 130 and the AC input module 110 jointly supply power to the 48V communication device 180. Among them, the output voltage of the rectification module 111 is stabilized at 47V. When the output voltages of the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 are stably increased, when the voltage output by the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 is higher than 47V, the rectification module 111 stops the mains input, and the multifunctional bidirectional DC conversion module used as the photovoltaic cell access module 121 and the multifunctional bidirectional DC conversion module used as the DC fan access module 131 are used to supply power to the 48V communication device 180.

[0075] Among them, the multi-functional bidirectional DC conversion module used as the PV cell access module 121 and the multi-functional bidirectional DC conversion module used as the DC fan access module 131 both have the hot plug function, and can both adjust the voltage value according to the control of the monitoring module 100, and finally adjust the power supply priority. Its input voltage is 40V to 60V, and the output voltage is adjustable from 42V to 58V.

[0076] In this embodiment, in order to ensure that the battery 140 has sufficient power, the monitoring module 100 is further configured to detect that the output voltage of the multi-functional bidirectional DC conversion module used as the PV cell access module 121 or the multi-functional bidirectional DC conversion module used as the DC fan access module 131 is greater than the fourth preset voltage value, and then reverse the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 to charge the battery 140. The multi-functional bidirectional DC conversion module used as the battery sharing manager 141 has a bidirectional input and output function, and there are two ways: the battery 140 supplies power to the switching power supply and the switching power supply charges the battery 140. The bidirectional input and output voltages are both adjustable from 42V DC to 58V DC. The multi-functional bidirectional DC conversion module used as the battery sharing manager 141 has the hot plug function, and the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 can adjust the voltage value according to the control of the monitoring module 100, and finally adjust the power supply priority. When the mains module, the multi-functional bidirectional DC conversion module used as the PV cell access module 121, and the multi-functional bidirectional DC conversion module used as the DC fan access module 131 jointly supply power to the 48V communication device 180, when the output voltages of the multi-functional bidirectional DC conversion module used as the PV cell access module 121 and the multi-functional bidirectional DC conversion module used as the DC fan access module 131 rise to the fourth preset voltage value, then reverse the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 to supply power in the forward direction to charge the battery 140. Among them, the fourth preset voltage value is greater than the first preset voltage value. In this embodiment, the fourth preset voltage value is 56V.

[0077] In this embodiment, to further reduce the burden on the mains, an inverter module 191 and a public grid connection module 190 are further included. The input end of the public grid connection module 190 is connected to the DC bus distribution module 101 through the inverter module 191, the output end of the public grid connection module 190 is connected to the mains power grid, and the control end of the inverter module 191 is connected to the monitoring module 100;

[0078] The monitoring module 100 is further configured to control the inverter module 191 to operate to convert the direct current generated by the photovoltaic cell 120 and the DC fan 130 into alternating current and supply power to the commercial power grid through the public network grid-connection module 190 when it is detected that the output voltage of the multi-functional bidirectional DC conversion module used as the photovoltaic cell access module 121 or the multi-functional bidirectional DC conversion module used as the DC fan access module 131 is greater than the fifth preset voltage. In this embodiment, the value of the fourth preset voltage is 57V.

[0079] When the electric energy generated by the photovoltaic cell 120 and the DC fan 130 is sufficient and the battery 140 is fully charged, when the output voltage of the multi-functional bidirectional DC conversion module used as the photovoltaic cell access module 121 or the multi-functional bidirectional DC conversion module used as the DC fan access module 131 is greater than the fifth preset voltage, the inverter module 191 is controlled to operate to convert the direct current generated by the photovoltaic cell 120 and the DC fan 130 into alternating current and supply power to the commercial power grid through the public network grid-connection module 190, which not only meets the power supply needs of the base station, but also reduces the negative pressure of the commercial power, achieving energy conservation and carbon reduction. The inverter module 191 can invert the electric energy into 220V / 380V electric energy, which can supply power to the air conditioner of the 48V communication device 180 or supply power to the commercial power grid through the public network grid-connection module 190. The inverter module 191 can adjust the voltage value according to the monitoring of the monitoring module 100 and finally adjust the power supply priority.

[0080] The monitoring module 100 is further configured to control the voltage setting of the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 to achieve peak shaving and valley filling. In the peak electricity price period and when solar energy and wind energy are insufficient, the monitoring module 100 issues an instruction to adjust and control the output voltage of the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 to be greater than the fifth preset value, the battery supplies power to the communication device, and the inverter module 191 and the grid-connection device 190 can also be started to supply power to the grid in the reverse direction. When in the peak electricity price period and when solar energy and wind energy are insufficient, the monitoring module 100 can control the multi-functional bidirectional DC conversion module used as the battery sharing manager 141 to supply power to the battery 140.

[0081] In this embodiment, the storage battery 140 includes a plurality of battery packs. The same number of preset battery packs are connected to the DC busbar power distribution module 101 through the same multifunctional bidirectional DC conversion module used as the battery sharing manager 141. Different battery packs are connected to the DC busbar power distribution module 101 through different multifunctional bidirectional DC conversion modules used as the battery sharing manager 141. The multifunctional bidirectional DC conversion module used as the battery sharing manager 141 is used to manage the battery packs. Each multifunctional bidirectional DC conversion module used as the battery sharing manager 141 can be connected with N groups of the same battery packs, where 1 ≤ N ≤ 4. When the storage batteries 140 are different, the different storage batteries 140 are connected to the DC busbar power distribution module 101 through different multifunctional bidirectional DC conversion modules used as the battery sharing manager 141. Through the multifunctional bidirectional DC conversion module used as the battery sharing manager 141, the isolation and priority discharge functions of different storage batteries 140 can be realized. Among them, if the same storage batteries are used for the storage battery 140, they can be directly connected to the DC busbar power distribution module 101 through a circuit breaker, or can be connected to the DC busbar power distribution module 101 through the multifunctional bidirectional DC conversion module used as the battery sharing manager 141; different storage batteries 140 are connected to the DC busbar power distribution module 101 through a DC-DC module to realize the isolation and priority discharge functions between different storage batteries 140.

[0082] In this embodiment, the monitoring module 100 includes a detection unit, a display interface, and an input keyboard. The detection unit is used to detect the voltage, current, and frequency of the output electric energy of the rectification module 111, the multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module used as a DC fan access module 131, and the multi-functional bidirectional DC conversion module used as a battery sharing manager 141. The display interface is used to display the working conditions of the rectification module 111, the multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module used as a DC fan access module 131, and the multi-functional bidirectional DC conversion module used as a battery sharing manager 141. The input keyboard is used to set the working states of the rectification module 111, the multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module used as a DC fan access module 131, and the multi-functional bidirectional DC conversion module used as a battery sharing manager 141. The monitoring module 100 can detect the working conditions of the rectification module 111, the multi-functional bidirectional DC conversion module used as a photovoltaic cell access module 121, the multi-functional bidirectional DC conversion module used as a DC fan access module 131, and the multi-functional bidirectional DC conversion module used as a battery sharing manager 141 through the detection unit, and display them through the display interface; and set the control logic of each module through the key module, and control each module to supply power according to the newly set logic. Among them, the monitoring module 100 further includes a communication interface, and the communication interface is used for power monitoring communication or remote communication. The monitoring module 100 can be connected to each multi-functional bidirectional DC conversion module through the communication interface for monitoring communication, or can be connected to a remote platform for remote communication. The communication interface can adopt an RS485 communication interface or an RJ45 communication interface.

[0083] In this embodiment, the control end of the intelligent DC power distribution unit 181 is connected to the control module;

[0084] The monitoring module 100 is used to control the power supply or power-off of the 48V communication device 180 through the intelligent DC power distribution unit 181. The intelligent DC power distribution unit 181 can control the on-off of each switch according to the control of the monitoring module 100 to realize the power supply or power-off of the 48V communication device 180.

[0085] In some embodiments, the monitoring module 100 can be used as a driving unit of the multi-functional bidirectional DC conversion module; in other embodiments, the multi-functional bidirectional DC conversion module can also adopt an independent driving unit, and the monitoring module 100 is connected to the driving unit to monitor and control the multi-functional bidirectional DC conversion module.

[0086] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of this application, the patent protection scope of this application cannot be limited thereby. Any technical solutions resulting from equivalent structure or equivalent process substitution or modification made based on the essential concept of this application and using the content recorded in the text and drawings of the specification of this application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included within the patent protection scope of this application.

Claims

1. A multifunctional bidirectional DC conversion module, characterized in that, It includes a first conversion unit, an isolation transformer, a second conversion unit and a drive unit; The first conversion unit includes a first input side, a first output side, a capacitor C1, switching transistors Q1-Q4 and an inductor L1. The capacitor C1 is arranged between the positive and negative poles of the first input side. The drain of the switching transistor Q1 is connected to the positive pole of the first input side, and the source of the switching transistor Q1 is connected to one end of the inductor L1. The drain of the switching transistor Q2 is connected to one end of the inductor L1, and the source of the switching transistor Q2 is connected to the negative pole of the first input side. The drain of the switching transistor Q3 is connected to the other end of the inductor L1, and the source of the switching transistor Q3 is connected to the negative pole of the first output side. The drain of the switching transistor Q4 is connected to the positive pole of the first output end, and the source of the switching transistor Q4 is connected to the other end of the inductor L1. The first output side is connected to one side of the isolation transformer; The second conversion unit includes a second input side, a second output side, a capacitor C2, switching transistors Q5-Q8 and an inductor L2. The capacitor C2 is arranged between the positive and negative poles of the second output side. The drain of the switching transistor Q5 is connected to the positive pole of the second input side, and the source of the switching transistor Q5 is connected to one end of the inductor L2. The drain of the switching transistor Q6 is connected to one end of the inductor L2, and the source of the switching transistor Q6 is connected to the negative pole of the second input side. The drain of the switching transistor Q7 is connected to the other end of the inductor L2, and the source of the switching transistor Q7 is connected to the negative pole of the second output side. The drain of the switching transistor Q8 is connected to the positive pole of the second output end, and the source of the switching transistor Q8 is connected to the other end of the inductor L2. The second input side is connected to the other side of the isolation transformer; The control terminals of the switching transistors Q1-Q8 are connected to the drive unit; The drive unit is used to send trigger signals to the switching transistors Q1-Q8 to control the working timings of the switching transistors Q1-Q8.

2. The multifunctional bidirectional DC conversion module according to claim 1, wherein The switching transistors are MOS transistors.

3. The multifunctional bidirectional DC conversion module according to claim 1, wherein The drive unit is also used to control the duty cycles of the switching transistors Q1-Q8.

4. The multifunctional bidirectional DC conversion module according to claim 1, characterized in that, When the drive unit is used for forward power supply, it controls the working timings of the switching transistors Q1-4 to be ahead of the switching transistors Q5-8 by a preset period. When it is used for reverse power supply, the working timings of the switching transistors Q1-4 are behind the switching transistors Q5-8 by a preset period.

5. A modular switching power supply based on a multifunctional bidirectional DC conversion module, which includes an AC input module, a rectification module, a DC bus power distribution module, a multifunctional bidirectional DC conversion module, a DC power distribution unit and a monitoring module; The AC input module is connected to the DC bus power distribution module through the rectification module; The multifunctional bidirectional DC conversion module is connected to the DC bus power distribution module. There are multiple multifunctional bidirectional DC conversion modules, which are respectively used for photovoltaic access, wind turbine access and battery common manager. The multifunctional bidirectional DC conversion module is the multifunctional bidirectional DC conversion module described in any one of claims 1-4; The DC power distribution unit is connected to the DC bus power distribution module to provide working power for communication equipment; The monitoring module is used to monitor and control the rectification module, the multi-functional bidirectional DC conversion module, and the DC power distribution module to operate under various conditions; when the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access reaches the first preset voltage value, the monitoring module is used to supply power to the communication device through the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access. When the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access and / or wind turbine access drops to the second preset voltage value, the multi-functional bidirectional DC conversion module used as the battery sharing manager is started, and the communication device is powered through the multi-functional bidirectional DC conversion modules used for photovoltaic access, wind turbine access, and battery sharing manager. When the output voltage of the multi-functional bidirectional DC conversion module used as the battery sharing manager drops to the third preset voltage value, the multi-functional bidirectional DC conversion module used as the battery sharing manager is turned off, the rectification module is started, and the communication device is powered through the multi-functional bidirectional DC conversion modules used for photovoltaic access and wind turbine access and the rectification module. The first preset voltage value is greater than the second preset voltage value, and the second preset voltage value is greater than the third preset voltage value.

6. The modular switching power supply based on the multi-functional bidirectional DC conversion module according to claim 5, characterized in that, The monitoring module is further used to detect the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access or wind turbine access. When the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access or wind turbine access is greater than the fourth preset voltage value, the multi-functional bidirectional DC conversion module used as the battery sharing manager charges the battery module reversely. The fourth preset voltage value is greater than the first preset voltage value.

7. The modular switching power supply based on the multi-functional bidirectional DC conversion module according to claim 5, wherein, It further includes an inverter module and a public grid grid-connection module. The input end of the public grid grid-connection module is connected to the DC bus power distribution module through the inverter module. The output end of the public grid grid-connection module is connected to the municipal power grid. The control end of the inverter module is connected to the monitoring module; The monitoring module is further used to control the inverter module to operate to convert the direct current generated by the photovoltaic power module and the DC fan power module into alternating current and supply power to the municipal power grid through the public grid grid-connection module when it detects that the output voltage of the multi-functional bidirectional DC conversion module used for photovoltaic access or wind turbine access is greater than the fifth preset voltage value.

8. The modular switching power supply based on the multi-functional bidirectional DC conversion module according to claim 7, wherein The monitoring module includes a detection unit, a display interface, and an input keyboard. The detection unit is used to detect the voltage and current of the output electrical energy of all multi-functional bidirectional DC conversion modules, and detect the voltage, current, and frequency of the rectification module and the inverter module. The display interface is used to display the working conditions of the rectification module, the multi-functional bidirectional DC conversion module, and the inverter module. The input keyboard is used to set the working states of the monitoring module, the multi-functional bidirectional DC conversion module, the rectification module, and the inverter module.

9. The modular switching power supply based on the multi-functional bidirectional DC conversion module according to claim 5, characterized in that, The same battery pack is connected to the DC bus power distribution module through the same multi-functional bidirectional DC conversion module used as the battery sharing manager, and different battery packs are connected to the DC bus power distribution module through different multi-functional bidirectional DC conversion modules used as the battery sharing manager.

10. The modular switching power supply based on the multi-functional bidirectional DC conversion module according to claim 5, characterized in that, The monitoring module further includes a communication interface, and the communication interface is used for power environment monitoring communication or remote communication.

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