Direct-current voltage converter with multi-path input and control method thereof

Abstract

The invention discloses a DC voltage converter with multipath input and a control method thereof, and solves the problems of complex circuit structure and control mode, high cost and the like in the prior art. The DC voltage converter comprises a plurality of input branches, an inductor and a plurality of output branches, each input branch comprises an input power supply and a controllable input switch unit, and the controllable input switch unit is connected with the positive electrode end of the input power supply and the inductor; the negative electrode ends of the plurality of input power supplies are connected with the input common ground end; the controllable input common-ground switch unit is respectively connected with the input common-ground end and the inductor; the control method comprises the following steps: configuring an initial power supply output voltage provided by each input power supply according to a power supply priority sequence; and determining a selected input branch corresponding to the real-time input mode, controlling a controllable input switch unit in the selected input branch to be in a closed state, and controlling a controllable input switch unit in a non-selected input branch to be in an open state.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power electronics, and particularly relates to a DC voltage converter with multiple input paths and a control method thereof. BACKGROUND

[0002] With the development of new energy technology and the increasing demand for energy saving and consumption reduction, more and more household appliances, electronic products and the like are powered by multiple input power sources including new energy. Generally, the DC voltage provided by each input power source needs to be converted into a DC voltage required by a load by a DC voltage converter (DC-DC converter) to meet the demand for working voltage of the same load under different working conditions and / or different loads.

[0003] In the related art, one DC voltage converter is connected to each input power source, and the DC voltage required by the load is output by controlling the DC voltage converter of the input power source actually supplying power at present. One DC voltage converter is provided for each input power source, which leads to complex circuit board structure and large circuit board area in products with multiple input power sources, thereby increasing the cost of circuit and limiting the application of the DC voltage converter in small-sized and portable products. In addition, when multiple input power sources supply power at the same time, the problem of power supply priority order usually arises. In order to make the multiple input power sources supply power according to the set priority order, the input voltage, input current and power of the load of each power supply need to be sampled, and then the multiple DC voltage converters are controlled according to the power matching condition to realize switching of different input power sources. This input power supply control method needs to collect multiple electrical parameters, thereby increasing the hardware cost and data processing complexity. SUMMARY

[0004] The present application aims to provide a DC voltage converter with multiple input paths and a control method thereof, and solve the technical problems of complex circuit structure and control method and high cost in the prior art when multiple input power sources supply power.

[0005] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions: The control method of the DC voltage converter with multiple input paths provided by the present application comprises the following steps: a plurality of input branches, each of the input branches comprising an input power source and a controllable input switch unit, a first end of the controllable input switch unit being connected to a positive terminal of the input power source in the input branch where the controllable input switch unit is located; an inductor, a second end of the controllable input switch unit in each of the input branches being connected to a first end of the inductor; an input common ground terminal, the negative terminal of the input power supply in each of the input branches is connected to the input common ground terminal; a controllable input common ground switch unit, a first end of the controllable input common ground switch unit is connected to the input common ground terminal, and a second end of the controllable input common ground switch unit is connected to the first end of the inductor; a plurality of output branches, each of the output branches comprises a controllable output switch unit, an output positive terminal and an output negative terminal, a first end of the controllable output switch unit is connected to the output positive terminal in the output branch where the controllable output switch unit is located, and a second end of the controllable output switch unit is connected to the second end of the inductor; an output common ground terminal, the output negative terminal in each of the output branches is connected to the output common ground terminal; a controllable output common ground switch unit, a first end of the controllable output common ground switch unit is connected to the output common ground terminal, and a second end of the controllable output common ground switch unit is connected to the second end of the inductor; The control method comprises: obtaining a power supply priority order of a plurality of input power supplies; configuring an initial power supply output voltage provided by each input power supply according to the power supply priority order, so that the initial power supply output voltage provided by an input power supply with a high priority is higher than the initial power supply output voltage provided by an input power supply with a low priority; obtaining a real-time input mode, determining a selected input branch corresponding to the real-time input mode, and controlling the controllable input switch unit in the selected input branch to be in a closed state and controlling the controllable input switch unit in the non-selected input branch to be in an open state when an output voltage is provided by an input power supply.

[0006] The application provides a DC voltage converter with multiple input channels, comprising: a plurality of input branches, each of the input branches comprises an input power supply and a controllable input switch unit, a first end of the controllable input switch unit is connected to the positive terminal of the input power supply in the input branch where the controllable input switch unit is located; an inductor, a second end of the controllable input switch unit in each of the input branches is connected to a first end of the inductor; an input common ground terminal, the negative terminal of the input power supply in each of the input branches is connected to the input common ground terminal; a controllable input common ground switch unit, a first end of the controllable input common ground switch unit is connected to the input common ground terminal, and a second end of the controllable input common ground switch unit is connected to the first end of the inductor; a plurality of output branches, each of the output branches comprises a controllable output switch unit, an output positive terminal and an output negative terminal, a first end of the controllable output switch unit is connected to the output positive terminal in the output branch where the controllable output switch unit is located, and a second end of the controllable output switch unit is connected to the second end of the inductor; An output common ground end, the output negative end in each of the output branches is connected with the output common ground end; A controllable output common ground switch unit, a first end of which is connected with the output common ground end, and a second end of which is connected with the second end of the inductor; A controller configured to execute the control method of the DC voltage converter with multiple inputs.

[0007] The application also provides a power supply system comprising the DC voltage converter with multiple inputs.

[0008] The application also provides an electronic device comprising a processor, a memory and a computer program stored in the memory, the processor being configured to execute the computer program to realize the control method of the DC voltage converter with multiple inputs.

[0009] The application also provides a computer readable storage medium, which stores a computer program, the computer program being executed by a processor to realize the control method of the DC voltage converter with multiple inputs.

[0010] Compared with the prior art, the application has the following advantages and positive effects: The DC voltage converter with multiple input provided by the application is connected in series with one input power supply and one controllable input switch unit to form an input branch, connected in series with one output positive terminal and one controllable output switch unit to form an output branch, connected with one input common ground terminal at the negative terminal of multiple input power supplies, connected with one output common ground terminal at the negative terminal of several output terminals, connected with multiple input branches and several output branches through an inductor, and connected with the inductor through the controllable input common ground switch unit and the controllable output common ground switch unit at the input common ground terminal and the output common ground terminal. The DC voltage converter with the topology structure can be connected with multiple input power supplies, and the common inductor, the input common ground terminal, the controllable input common ground switch unit, the output common ground terminal and the controllable output common ground switch unit are used to simplify the structure of the multiple input power supplies, reduce the devices and the occupied area of the converter, reduce the circuit cost, and facilitate the application of the DC voltage converter in small-sized and portable products. When the simplified DC voltage converter is controlled, the initial power output voltage provided by each input power supply is configured according to the power supply priority order of the multiple input power supplies, so that the initial power output voltage provided by the input power supply with high priority is higher than the initial power output voltage provided by the input power supply with low priority. Since the positive terminals of the multiple input power supplies are connected with the inductor at the same time and have a common terminal, when the actual power output voltage is the initial power output voltage, the input power supply with high initial power output voltage automatically cuts off the input power supply with low initial power output voltage when the input power supply is powered, so as to realize the purpose of automatically switching the input power supply according to the power supply priority, without collecting and processing multiple electrical parameters and switching control, and effectively simplifying the data processing complexity and control complexity when the multiple input power supplies perform power supply priority control.

[0011] Other features and advantages of the present application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0013] Figure 1 The topology structure diagram of some embodiments of the DC voltage converter with multiple input provided by the present application; Figure 2 The topology structure diagram of some other embodiments of the DC voltage converter with multiple input provided by the present application; Figure 3 The topology structure diagram of some other embodiments of the DC voltage converter with multiple input provided by the present application; Figure 2A topology diagram of the direct current voltage converter in an input-output mode; Figure 4 A topology diagram of the direct current voltage converter in an input-output mode; Figure 3 A working principle diagram of the topology diagram in a voltage control mode; Figure 5 A working principle diagram of the topology diagram in a voltage control mode; Figure 3 A working principle diagram of the topology diagram in a voltage control mode; Figure 6 A structure block diagram of some embodiments of the electronic device provided by the present application. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments.

[0015] It should be noted that the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0016] In order to solve the problems of complex circuit board structure, large required circuit board area, and high hardware cost, complex data processing complexity and other problems existing in the realization of power supply priority control when multiple input power supplies are used for power supply in the prior art because each input power supply corresponds to a direct current voltage converter connected to a direct current voltage converter, the present application provides a direct current voltage converter with multiple inputs and a control method thereof, which simplifies the structure of the direct current voltage converter connected to multiple input power supplies, reduces the devices of the converter and the occupied area, not only reduces the circuit cost, but also facilitates the application of the direct current voltage converter in small and portable products, and by configuring the initial power supply output voltage provided by each input power supply according to the power supply priority, multiple electrical parameters do not need to be collected for processing and switching control, which effectively simplifies the data processing complexity and control complexity when multiple input power supplies perform power supply priority control.

[0017] Figure 1 A topology diagram of some embodiments of the direct current voltage converter with multiple inputs provided by the present application is shown.

[0018] In Figure 1 The topology diagram shown in the figure, the direct current voltage converter includes n input branches, m output branches, inductance L, input common ground DC - , output common ground U -and a controller (not shown in the figure). Wherein, n is a natural number greater than 1, m is a natural number greater than or equal to 1. Therefore, the direct current voltage converter includes two or more input branches, and also includes one or more output branches, forming a direct current voltage converter with multiple inputs.

[0019] Each input branch includes an input power supply and a controllable input switch unit, the first end of the controllable input switch unit is connected with the positive end of the input power supply in the input branch where it is located, and the second end of the controllable input switch unit is connected with the first end of the inductor. Specifically in Figure 1 , the first input branch includes an input power supply DC1 and a controllable input switch unit K i1 , the first end of the controllable input switch unit K i1 is connected with the positive end DC1 + of the input power supply DC1, and the second end of the controllable input switch unit K i1 is connected with the first end (the left end of the inductor L in Figure 1 ) of the inductor L; the second input branch includes an input power supply DC2 and a controllable input switch unit K i2 , the first end of the controllable input switch unit K i2 is connected with the positive end DC2 + of the input power supply DC2, and the second end of the controllable input switch unit K i2 is connected with the first end of the inductor L; the nth input branch includes an input power supply DCn and a controllable input switch unit K in , the first end of the controllable input switch unit K in is connected with the positive end DCn + of the input power supply DCn, and the second end of the controllable input switch unit K in is connected with the first end of the inductor L.

[0020] The negative end of the input power supply in each input branch is connected with an input common ground DC - , and the input common ground DC - is also connected with the inductor L through a controllable input common ground switch unit K ic . Specifically, the first end of the controllable input common ground switch unit K ic is connected with the input common ground DC - , and the second end of the controllable input common ground switch unit K ic is connected with the first end of the inductor L.

[0021] Each output branch includes a controllable output switch unit, an output positive end and an output negative end, the first end of the controllable output switch unit is connected with the output positive end in the output branch where it is located, and the second end of the controllable output switch unit is connected with the second end of the inductor. Specifically as Figure 1 shown, the first output branch includes a controllable output switch unit Ko1 , output positive terminal U1 + and output negative terminal (not shown) Figure 1 The first end of the controllable output switch unit K o1 is connected with the output positive terminal U1 + , and the second end of the controllable output switch unit K o1 is connected with the second end of the inductor L (the right end of the inductor L in this embodiment) Figure 1 . The second output branch includes a controllable output switch unit K o2 , an output positive terminal U2 + and an output negative terminal (not shown) Figure 1 The first end of the controllable output switch unit K o2 is connected with the output positive terminal U2 + , and the second end of the controllable output switch unit K o2 is connected with the second end of the inductor L. The mth output branch includes a controllable output switch unit K om , an output positive terminal Um + and an output negative terminal (not shown) Figure 1 The first end of the controllable output switch unit K om is connected with the output positive terminal Um + , and the second end of the controllable output switch unit K om is connected with the second end of the inductor L.

[0022] The output negative terminal in each output branch is connected with the output common terminal U - , and the output common terminal U - is further connected with the inductor L through a controllable output common switch unit K oc . Specifically, the first end of the controllable output common switch unit K oc is connected with the output common terminal U - , and the second end of the controllable output common switch unit K oc is connected with the second end of the inductor L.

[0023] In this embodiment, the controllable input switch unit, the controllable output switch unit, the controllable input common switch unit and the controllable output common switch unit are all MOSFETs with control terminals (gate terminals) Figure 1The switch unit (not shown) can be in a closed state or an open state under the action of a control signal from the controller. When the switch unit is in the closed state, the circuit in which the switch unit is located is in a conductive state allowing current to flow. When the switch unit is in the open state, the circuit in which the switch unit is located is in a disconnected state not allowing current to flow. The embodiment is not limited in structure of the controllable input switch unit, the controllable output switch unit, the controllable input common ground switch unit, and the controllable output common ground switch unit. All switch units having two states of closed and open under the action of a control signal belong to the protection scope of the present application.

[0024] Figure 1 In the shown DC voltage converter topology, an input power source and a controllable input switch unit are connected in series to form an input branch, a positive output terminal and a controllable output switch unit are connected in series to form an output branch, negative terminals of multiple input power sources are connected to an input common ground terminal, a plurality of negative output terminals are connected to an output common ground terminal, and the multiple input branches and the plurality of output branches are connected through an inductor. The input common ground terminal and the output common ground terminal are also connected to the inductor through a controllable input common ground switch unit and a controllable output common ground switch unit, respectively. The DC voltage converter of the topology can be connected to multiple input power sources. Through control of each controllable switch unit in the topology, the DC voltage converter can be used to perform DC voltage conversion in various modes.

[0025] In the topology, the common inductor, the input common ground terminal, the controllable input common ground switch unit, the output common ground terminal, and the controllable output common ground switch unit enable one DC voltage converter to be connected to multiple input power sources without the need for each input power source to be connected to a DC voltage converter. Thus, the structure of the DC voltage converter connected to multiple input power sources is simplified, the number of devices and the occupied area of the DC voltage converter are effectively reduced, the circuit cost is lowered, and the DC voltage converter is conducive to application in small and portable products.

[0026] In other embodiments, the controllable input switch unit, the controllable input common ground switch unit, the controllable output switch unit, and the controllable output common ground switch unit in the DC voltage converter topology are implemented by IGBT power switch units or MOSFET power switch units.

[0027] For the DC voltage converter having the above structure, the control of automatic matching of input power sources according to power supply priorities can be realized. The specific control method completed by the controller includes: Obtain the power supply priority order of multiple input power sources. The power supply priority order is known and can be set according to actual needs. For example, to fully utilize new energy sources and reduce consumption of the mains power grid, when there are three input power sources: photovoltaic, energy storage, and mains power, photovoltaic power supply has the highest priority, followed by energy storage power supply, and mains power supply has the lowest priority.

[0028] The initial power output voltage provided by each input power source is configured according to power supply priority, such that the initial power output voltage provided by a higher-priority input power source is higher than that provided by a lower-priority input power source. The method for configuring the initial power output voltage of the input power sources can be implemented using existing technology, depending on the type of input power source; this embodiment does not limit or specifically describe this method.

[0029] The system acquires the real-time input mode, determines the selected input branch corresponding to the real-time input mode, and controls the controllable input switch unit in the selected input branch to be closed when the output voltage is provided by the input power supply, and controls the controllable input switch unit in the non-selected input branch to be open. The input mode includes the number of actual inputs and which / some branches serve as actual input branches. After the input mode is determined, the input branches that need to participate in the operation corresponding to that input mode can be identified; these input branches are defined as the selected input branches corresponding to the input mode. After the selected input branches are determined, at least when the output voltage is provided by the input power supply, the controllable input switch unit in the selected input branch is controlled to be closed to utilize the input voltage provided by the input power supply; while the controllable input switch unit in the non-selected input branch is controlled to be open to cut off the power supply to the non-selected input branches.

[0030] Since the positive terminals of multiple input power supplies are simultaneously connected to one end of an inductor via a controllable input switching unit, the positive voltage terminals of these multiple input power supplies share a common terminal. When powered by the input power supply, if the actual power supply output voltage is equal to the initial power supply output voltage, the input power supply with the higher initial power supply output voltage automatically cuts off the input power supply with the lower initial power supply output voltage. Furthermore, since the initial power supply output voltages provided by the multiple input power supplies are configured according to power supply priority, the goal of automatically switching input power supplies according to power supply priority is achieved. This process eliminates the need to collect and process multiple current, voltage, and other electrical parameters for switching control, effectively simplifying the data processing and control complexity when performing power supply priority control for multiple inputs.

[0031] Figure 2 The diagram shows the topology of some other embodiments of the DC-DC converter with multiple inputs provided by the present invention.

[0032] like Figure 2As shown, in this embodiment, the direct current voltage converter has six terminals, namely terminals ①, ②, ③, ④, ⑤ and ⑥, wherein terminals ①, ②, ④ and ⑤ are connected to the positive pole of the direct current voltage, terminals ③ and ⑥ are common ground terminals and are connected to the negative pole of the direct current voltage; L is an inductor, and G1, G2, G3, G4, G5 and G6 are controllable switching units. The direct current voltage converter also has two inputs, and the input power sources corresponding to the two inputs are a photovoltaic module power supply unit and an energy storage module power supply unit.

[0033] The direct current voltage converter of this embodiment can form a converter structure with multiple input modes and multiple output modes. The input mode can be a single input mode or a double input mode; the output mode can be a single output mode or a double output mode. The conduction direction of the controllable switching units is such that the current in the circuit is transmitted from left to right, and the specific structure of the direct current voltage converter is as follows: terminal ① is a terminal connected to the positive pole of the input power source and is connected to the positive pole of the photovoltaic module power supply unit as the input power source; terminal ② is a terminal connected to the positive pole of the input power source and is connected to the positive pole of the energy storage module power supply unit as the input power source; G1 is a controllable input switching unit and is connected to the photovoltaic module power supply unit connected to terminal ① to form a first input branch and is connected to inductor L; G6 is a controllable input switching unit and is connected to the energy storage module power supply unit connected to terminal ② to form a second input branch and is connected to inductor L. Terminal ③ is an input common ground terminal and is connected to the negative pole of each input power source; G2 is a controllable input common ground switching unit and connects terminal ③ to inductor L. Terminals ④ and ⑤ are terminals connected to the positive pole of the output; G3 is a controllable output switching unit and is connected to the positive pole of the output connected to terminal ④ to form a first output branch and is connected to inductor L; G5 is a controllable output switching unit and is connected to the positive pole of the output connected to terminal ⑤ to form a second output branch and is connected to inductor L. Terminal ⑥ is an output common ground terminal and is connected to the negative pole of each output branch and is connected to inductor L through G4 as a controllable output common ground switching unit. The first output branch supplies power to load 1, and the second output branch supplies power to load 2.

[0034] By using the photovoltaic module power supply unit as the input power source, solar energy can be converted into electrical energy to supply power to the load, achieving the purpose of energy saving; by using the energy storage module power supply unit as the input power source, the energy storage module can store excess electrical energy generated by the photovoltaic module, and when the electrical energy provided by the photovoltaic module power supply unit cannot meet the demand of the load, the energy storage module power supply unit is used to supply power to the load, maintaining the operation of the load.

[0035] To fully utilize solar energy resources, in a dual-input mode using both photovoltaic (PV) power supply units and energy storage module power supply units as input power sources, the PV power supply unit will be prioritized, meaning its power supply priority is higher than that of the energy storage module power supply unit. Therefore, the initial power output voltage provided by the PV power supply unit is configured to be higher than that provided by the energy storage module power supply unit. When powered by the input power source, controls G1, G2, and G6 are all closed. When solar energy is sufficient, the actual power output voltage Vdc1 of the PV power supply unit is the initial power output voltage, which is higher than that of the energy storage module power supply unit. The energy storage module power supply unit is then disconnected, and all the power required by the load is provided by the PV power supply unit. When solar energy is insufficient, or when the load power increases, the actual power output voltage Vdc1 of the PV power supply unit will be pulled down by the load, falling below its initial power output voltage. When the actual power output voltage Vdc1 of the PV power supply unit is lower than the actual power output voltage Vdc2 of the energy storage module power supply unit, the energy storage module power supply unit will output power to supply the load to supplement its power requirements. This enables automatic switching of the input power supply.

[0036] Figure 3 It shows Figure 2 The topology diagram of the DC-DC converter in one input-output mode, specifically in the single-input-single-output mode.

[0037] In this single-input-single-output mode, the input mode selects the photovoltaic module power supply unit as the real-time power input, and the output mode selects the output branch that supplies power to load 1 to be turned on, thus supplying power to load 1. Based on the input and output modes, the selected input and output branches are determined as follows: Terminal ① is selected as the terminal connecting to the positive terminal of the input power supply, and G1, as a controllable input switch unit, forms an input branch with the photovoltaic module power supply unit connected to terminal ①; this input branch is the selected input branch. Terminal ④ is also selected as the terminal connecting to the positive terminal of the output, and G3, as a controllable output switch unit, forms an output branch with the positive terminal of terminal ④; this output branch is the selected output branch. The input branch formed by terminal ② and the controllable output switch unit G6 is a non-selected input branch, and G6 is controlled to be in the off state; the output branch formed by terminal ⑤ and the controllable output switch unit G5 is a non-selected output branch, and G5 is controlled to be in the off state. To simplify the circuit structure, Figure 3 The non-selected input branch and non-selected output branch have been removed, as well as components such as diodes connected in parallel with transistors in the IGBT power switching unit.

[0038] for Figure 3The DC-DC converter shown can achieve at least two voltage control modes, including boost control mode and buck control mode, by controlling each controllable switching unit. Accordingly, the control method of this DC-DC converter includes: The system acquires the real-time voltage control mode and controls the switching states of the controllable input switch unit in the selected input branch, the controllable output switch unit in the selected output branch, the controllable input ground switch unit, and the controllable output ground switch unit according to the real-time voltage control mode. Based on the switching states of the controlled switch units, the system uses a DC-DC converter to perform DC voltage conversion corresponding to the real-time voltage control mode. The real-time voltage control mode includes a boost control mode and a buck control mode.

[0039] In some other embodiments, when the real-time voltage control mode is a boost control mode, the real-time boost ratio of the real-time voltage control mode is also obtained; then, the real-time duty cycle of each switch unit to be controlled is determined according to the real-time boost ratio, the switching state of the corresponding switch unit is controlled according to the real-time duty cycle, and the boosted DC voltage that meets the real-time boost ratio requirement is output by the DC voltage converter.

[0040] When the real-time voltage control mode is buck control mode, the real-time buck ratio of the real-time voltage control mode is obtained; then, the real-time duty cycle of each switch unit to be controlled is determined according to the real-time buck ratio, and the switching state of the corresponding switch unit is controlled according to the real-time duty cycle, so as to use the DC voltage converter to output the reduced DC voltage that meets the real-time buck ratio requirement.

[0041] in, Figure 4 It shows Figure 3 The topology diagram is a working principle diagram in a voltage control mode, specifically in the boost control mode.

[0042] The control process of each controllable switching unit in boost control mode is as follows: First, such as Figure 4 As shown in Figure (a), controls G1 and G4 are closed, and controls G2 and G3 are open, so that the input power supply charges the inductor L.

[0043] Then, as Figure 4 As shown in Figure (b), control G4 is open, control G3 is closed, and G1 remains closed. The power output voltage provided by the input power supply and the inductor L together provide an output voltage to the positive terminal of the output connected to terminal ④. This output voltage is higher than the power output voltage provided by the input power supply, thereby achieving the purpose of boosting the voltage through the DC voltage converter.

[0044] By controlling the switching states of G3 and G4 using the duty cycle determined by the boost ratio, a boosted DC voltage that meets the boost ratio requirement can be obtained.

[0045] Figure 5 It shows Figure 3 The diagram illustrates the operating principle of the topology in another voltage control mode, specifically the buck control mode. The control process of each controllable switching unit in buck control mode is as follows: First, such as Figure 5 As shown in Figure (a), controls G1 and G3 are closed, and controls G2 and G4 are open. The input power supply voltage is supplied to the positive output terminal connected to terminal ④ through inductor L. Due to the voltage division of inductor L, the output voltage at the positive output terminal is lower than the power supply output voltage provided by the input power supply, thereby achieving the purpose of stepping down the voltage through the DC-DC voltage converter.

[0046] Then, as Figure 5 As shown in Figure (b), control G1 is open, control G2 is closed, G3 remains closed, and G4 remains open. The output voltage is provided by inductor L to the positive terminal of the output connected to terminal ④, so as to realize the freewheeling current in the circuit.

[0047] By controlling the switching states of G1 and G2 using the duty cycle determined by the buck ratio, a reduced DC voltage that meets the buck ratio requirement can be obtained.

[0048] Other embodiments of the present invention also provide a power supply system that includes the DC-DC converter with multiple inputs of the above embodiments and achieves the same technical effects as the DC-DC converters of the corresponding embodiments.

[0049] Figure 6 A structural block diagram of an embodiment of the electronic device of the present invention is shown. The electronic device includes a processor 61, a memory 62, and a computer program 621 stored in the memory 62. The processor 61 is configured to execute the computer program 621 to implement the control method of the DC-DC converter with multiple inputs described in the above embodiment, and to achieve the technical effects of the corresponding embodiment. The electronic device may be a main control board or controller of a power supply system.

[0050] Other embodiments of the present invention also provide a computer storage medium storing a computer program. When the computer program is executed by a processor, it implements the control method of the DC voltage converter with multiple inputs described above and achieves the technical effects of the corresponding embodiments.

[0051] The computer storage medium described above can be realized by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The computer storage medium can be any available storage medium that can be accessed by a general-purpose or special-purpose computer.

[0052] In some embodiments, the computer storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the storage medium can also exist as discrete components in the device.

[0053] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A control method of a direct current voltage converter having multiple inputs, characterized in that, The direct-current voltage converter comprises: a plurality of input branches, each of the input branches comprising an input power supply and a controllable input switch unit, a first end of the controllable input switch unit being connected to a positive terminal of the input power supply in the input branch where the controllable input switch unit is located; an inductor, a second end of the controllable input switch unit in each of the input branches being connected to a first end of the inductor; an input common ground terminal, a negative terminal of the input power supply in each of the input branches being connected to the input common ground terminal; a controllable input common ground switch unit, a first end of the controllable input common ground switch unit being connected to the input common ground terminal, and a second end of the controllable input common ground switch unit being connected to the first end of the inductor; a plurality of output branches, each of the output branches comprising a controllable output switch unit, an output positive terminal and an output negative terminal, a first end of the controllable output switch unit being connected to the output positive terminal in the output branch where the controllable output switch unit is located, and a second end of the controllable output switch unit being connected to a second end of the inductor; an output common ground terminal, the output negative terminal in each of the output branches being connected to the output common ground terminal; a controllable output common ground switch unit, a first end of the controllable output common ground switch unit being connected to the output common ground terminal, and a second end of the controllable output common ground switch unit being connected to the second end of the inductor; The control method comprises: obtaining a power supply priority order of a plurality of input power supplies; configuring an initial power supply output voltage provided by each input power supply according to the power supply priority order, so that the initial power supply output voltage provided by an input power supply with a high priority is higher than the initial power supply output voltage provided by an input power supply with a low priority; obtaining a real-time input mode, determining a selected input branch corresponding to the real-time input mode, and controlling the controllable input switch unit in the selected input branch to be in a closed state and the controllable input switch unit in a non-selected input branch to be in an open state when an output voltage is provided by an input power supply.

2. The control method of a DC voltage converter with multiple inputs according to claim 1, characterized in that, When the real-time input mode is a single-input mode, the selected input branch is one. The control method further comprises: obtaining a real-time output mode, determining a selected output branch corresponding to the real-time output mode, and controlling the controllable output switch unit in a non-selected output branch to be in an open state; obtaining a real-time voltage control mode, and controlling the switching states of the controllable input switch unit in the selected input branch, the controllable output switch unit in the selected output branch, the controllable input common ground switch unit and the controllable output common ground switch unit according to the real-time voltage control mode; the real-time voltage control mode comprises a boost control mode and a buck control mode.

3. The control method of a DC voltage converter with multiple inputs according to claim 2, characterized in that, The control method further comprises: when the real-time voltage control mode is the boost control mode, obtaining a real-time boost ratio of the real-time voltage control mode, determining a real-time duty cycle of each switch unit to be controlled according to the real-time boost ratio, and controlling the switching state of the corresponding switch unit according to the real-time duty cycle.

4. The control method of a DC voltage converter with multiple inputs according to claim 3, characterized in that, The control method further comprises: when the real-time voltage control mode is the buck control mode, obtaining a real-time buck ratio of the real-time voltage control mode, determining a real-time duty cycle of each switch unit to be controlled according to the real-time buck ratio, and controlling the switching state of the corresponding switch unit according to the real-time duty cycle.

5. A DC voltage converter with multiple inputs, characterized in that comprises: a plurality of input branches, each of the input branches comprising an input power supply and a controllable input switch unit, a first end of the controllable input switch unit being connected to a positive terminal of the input power supply in the input branch where the controllable input switch unit is located; an inductor, a second end of the controllable input switch unit in each of the input branches being connected to a first end of the inductor; an input common ground, a negative terminal of the input power supply in each of the input branches being connected to the input common ground; a controllable input common ground switch unit, a first end of the controllable input common ground switch unit being connected to the input common ground, and a second end of the controllable input common ground switch unit being connected to the first end of the inductor; a plurality of output branches, each of the output branches comprising a controllable output switch unit, an output positive terminal and an output negative terminal, a first end of the controllable output switch unit being connected to the output positive terminal in the output branch where the controllable output switch unit is located, and a second end of the controllable output switch unit being connected to a second end of the inductor; an output common ground, the output negative terminal in each of the output branches being connected to the output common ground; a controllable output common ground switch unit, a first end of the controllable output common ground switch unit being connected to the output common ground, and a second end of the controllable output common ground switch unit being connected to the second end of the inductor; a controller configured to perform the control method of the direct current voltage converter with multiple input branches according to any one of claims 1 to 4.

6. The DC voltage converter with multiple inputs according to claim 5, characterized in that, The input branches are two, and the input power supplies in the two input branches are a photovoltaic module power supply unit and an energy storage module power supply unit, respectively.

7. The DC voltage converter with multiple inputs according to claim 5, characterized in that, The controllable input switch unit, the controllable input common ground switch unit, the controllable output switch unit and the controllable output common ground switch unit are IGBT power switch units or MOSFET power switch units.

8. A power supply system characterized by comprising: The power supply system comprises the direct current voltage converter with multiple input branches according to any one of claims 5 to 7.

9. An electronic device comprising a processor, a memory, and a computer program stored on the memory, wherein, The processor is configured to execute the computer program to implement the control method of the direct current voltage converter with multiple input branches according to any one of claims 1 to 4.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the control method of the direct current voltage converter with multiple input branches according to any one of claims 1 to 4.

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