Dual power supply single load power supply circuit

Abstract

The application provides a dual-power single-load power supply circuit, which comprises a first power module, a second power module and a second DCDC conversion module, the first end of the second DCDC conversion module is electrically connected with the positive pole of the first power module, the second end of the second DCDC conversion module is electrically connected with the positive pole connection end of the load, the third end of the second DCDC conversion module is electrically connected with the negative pole of the first power module, the negative pole of the second power module and the negative pole connection end of the load, the fourth end of the second DCDC conversion module is electrically connected with the positive pole of the second power module, the working mode of the second DCDC conversion module is controlled, the first power module supplies power to the load or the first power module and the second power module simultaneously supply power to the load, the conversion efficiency of the circuit is improved, and the hardware cost is reduced under the premise of ensuring the stability of power supply.

Description

Technical Field

[0001] This application relates to the field of power supply circuit technology, and in particular to a dual-power-supply single-load power supply circuit. Background Technology

[0002] In existing power supply technologies, multi-source power supply technology is being used more and more widely. Current technology uses DC-DC converter modules on each power supply branch to supply power to the load. This method significantly improves the power conversion efficiency, but adding DC-DC converter modules to each branch also increases equipment costs.

[0003] Taking the photovoltaic (PV) field as an example, the intermittent and fluctuating nature of PV power generation restricts its efficient utilization. Although energy storage technologies such as battery energy storage systems effectively smooth out power fluctuations through energy time-shifting mechanisms, the contradiction between system cost and conversion efficiency remains unresolved. Taking a typical PV-storage DC microgrid as an example, high-efficiency power supply to the batteries is achieved by setting two independent DC-DC converter modules at the output ends of the PV and battery modules, respectively. However, this also increases equipment costs, a significant economic issue particularly prominent in low-cost power solutions for remote areas and developing countries. Currently, the technological bottleneck of PV-storage microgrids lies in the balance between efficiency and cost. Therefore, how to improve energy conversion efficiency through topology optimization and control strategy improvements without significantly increasing hardware costs has become a key factor affecting the large-scale application of PV-storage DC microgrids. Utility Model Content

[0004] This application discloses a dual-power-supply single-load power supply circuit, which aims to reduce the number of DC-DC converter modules, improve the conversion efficiency of the circuit, and reduce hardware costs by using multiple power supplies, while ensuring power supply stability.

[0005] To achieve the above objectives, this application discloses a dual-power-supply single-load power supply circuit comprising: a first power supply module, a second power supply module, and a second DC-DC converter module;

[0006] The first terminal of the second DC-DC converter module is electrically connected to the positive terminal of the first power supply module, the second terminal of the second DC-DC converter module is electrically connected to the positive terminal of the load, the third terminal of the second DC-DC converter module is electrically connected to the negative terminal of the first power supply module, the negative terminal of the second power supply module, and the negative terminal of the load, and the fourth terminal of the second DC-DC converter module is electrically connected to the positive terminal of the second power supply module.

[0007] The second DC-DC converter module has at least two operating modes: a first operating mode and a second operating mode.

[0008] When the second DC-DC converter module is in the first working mode, the second power supply module supplies power to the load;

[0009] When the second DC-DC converter module is in the second operating mode, the first power module and the second power module simultaneously supply power to the load.

[0010] In some embodiments, the second DC-DC conversion module includes:

[0011] The third switch module, wherein the first terminal of the third switch module is electrically connected to the positive terminal of the first power supply module;

[0012] The second inductor module has its first end electrically connected to the second end of the third switch module, and its second end electrically connected to the positive terminal of the load.

[0013] The second switch module has its first terminal electrically connected to the positive terminal of the second power supply module, and its second terminal electrically connected to the first terminal of the second inductor module.

[0014] The fifth switch module has its first terminal electrically connected to the negative terminal of the first power module, the negative terminal of the second power module, and the negative terminal of the load, and its second terminal electrically connected to the first terminal of the second inductor module.

[0015] Wherein, the first end of the third switch module is the first end of the second DC-DC converter module, the second end of the second inductor module is the second end of the second DC-DC converter module, the first end of the fifth switch module is the third end of the second DC-DC converter module, and the first end of the second switch module is the fourth end of the second DC-DC converter module.

[0016] In some embodiments, the voltage of the first power module and the voltage across the load are both less than the voltage of the second power module. In some embodiments, the third switching module includes a third MOSFET and a sixth diode, wherein the first terminal of the sixth diode is electrically connected to the positive terminal of the first power module, the second terminal of the sixth diode is electrically connected to the first terminal of the third MOSFET, and the second terminal of the third MOSFET is electrically connected to the first terminal of the second inductor module;

[0017] The second switching module includes a second MOSFET, the first terminal of which is electrically connected to the positive terminal of the second power module, and the second terminal of which is electrically connected to the first terminal of the second inductor module.

[0018] The fifth switching module includes a fifth diode. The first end of the fifth diode is electrically connected to the negative terminal of the load, the negative terminal of the first power supply module, and the negative terminal of the second power supply module. The second end of the fifth diode is electrically connected to the first end of the second inductor module.

[0019] In some embodiments, the operating modes of the second DC-DC conversion module include mode one, mode two, and mode three;

[0020] When the second DC-DC converter module is in the first working mode, the second DC-DC converter module repeatedly switches between mode one and mode three;

[0021] When the second DC-DC converter module is in the second working mode, the second DC-DC converter module cycles through mode one, mode two, and mode three in sequence; or, when the second DC-DC converter module is in the second working mode, the second DC-DC converter module cycles through mode one, mode two, mode three, and mode two in sequence.

[0022] In some embodiments, when the second DC-DC conversion module is in mode one, the second switching module is turned on, and the third and fifth switching modules are blocked.

[0023] When the second DC-DC converter module is in mode one, the second switch module is blocked, the third switch module is turned on, and the fifth switch module is blocked;

[0024] When the second DC-DC converter module is in mode one, the second switch module is blocked, the third switch module is blocked, and the fifth switch module is turned on.

[0025] In some embodiments, the first power module is a photovoltaic module and the second power module is a battery module.

[0026] In some embodiments, the dual-power-supply-single-load power supply circuit further includes a first DC-DC converter module, the first DC-DC converter module comprising:

[0027] A first inductor module, wherein a first terminal of the first inductor module is electrically connected to the positive terminal of the photovoltaic module;

[0028] The first switch module has a first terminal electrically connected to the second terminal of the first inductor module, and the second terminal of the first switch module is electrically connected to the negative terminal of the photovoltaic module and the negative terminal of the battery module.

[0029] The fourth switch module has its first terminal electrically connected to the second terminal of the first inductor module, and its second terminal electrically connected to the positive terminal of the battery module.

[0030] In some embodiments, the dual-power-supply-single-load power supply circuit further includes:

[0031] The first filter module has its first end electrically connected to the positive terminal of the first power module and the first end of the third switch module, and its second end electrically connected to the negative terminal of the first power module.

[0032] The second filter module has its first end electrically connected to the positive terminal of the second power module and the first end of the second switch module, and its second end electrically connected to the negative terminal of the second power module.

[0033] The third filter module has its first end electrically connected to the second end of the second inductor module and the positive terminal of the load, and its second end electrically connected to the first end of the fifth switch module and the negative terminal of the load.

[0034] In some embodiments, the first switching module includes a first MOSFET, a first terminal of the first MOSFET being electrically connected to a second terminal of the first inductor module, and a second terminal of the first MOSFET being electrically connected to the negative terminal of the photovoltaic module.

[0035] The fourth switch module includes a fourth diode, the first end of which is electrically connected to the second end of the first inductor module, and the second end of which is electrically connected to the positive terminal of the battery module.

[0036] Compared with the prior art, the beneficial effects of this application are as follows:

[0037] The circuit includes a first power supply module, a second power supply module, and a second DC-DC converter module. A first terminal of the second DC-DC converter module is electrically connected to the positive terminal of the first power supply module. A second terminal of the second DC-DC converter module is electrically connected to the positive terminal of the load. A third terminal of the second DC-DC converter module is electrically connected to the negative terminals of the first and second power supply modules and the load. A fourth terminal of the second DC-DC converter module is electrically connected to the positive terminal of the second power supply module. By controlling the operating mode of the second DC-DC converter module, the first power supply module can supply power to the load, or both the first and second power supply modules can supply power to the load simultaneously. Both the first and second power supply modules can supply power to the load through the second DC-DC converter module. When the power of one power supply is insufficient to meet the power demand of the load, the other power supply can supplement the power. In this case, the first and second power supply modules can simultaneously and continuously supply power to the load through the second DC-DC converter module. This reduces the number of DC-DC converter modules, improves the circuit's conversion efficiency, and lowers hardware costs while ensuring power supply stability. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of one embodiment of this application;

[0040] Figure 2 This is a schematic diagram of yet another embodiment of this application;

[0041] Figure 3 This is a schematic diagram of another embodiment, mode one, of this application;

[0042] Figure 4 This is a schematic diagram of another embodiment, mode two, of this application;

[0043] Figure 5 This is a schematic diagram of mode three, another embodiment of this application;

[0044] Figure 6 This is a schematic diagram of another embodiment of the present application including a filtering module;

[0045] Figure 7 This is a schematic diagram of another embodiment of the present application;

[0046] Figure 8This is the circuit diagram of this application;

[0047] in, Figure 3-5 The red line indicates the current in the power supply circuit.

[0048] Figure Labels

[0049] 1-First switch module, 4-Fourth switch module, 6-First inductor module;

[0050] 7-First power supply module, 8-Second power supply module, 9-Load;

[0051] 3-Third switch module, 10-Second inductor module, 5-Fifth switch module, 2-Second switch module;

[0052] 11-First filtering module, 12-Second filtering module, 13-Third filtering module; Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0056] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0057] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0058] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0059] like Figure 1-8 As shown, this application provides a dual-power-supply single-load power supply circuit, including: a first power supply module 7, a second power supply module 8, and a second DC-DC conversion module;

[0060] The first terminal of the second DC-DC converter module is electrically connected to the positive terminal of the first power module 7, the second terminal of the second DC-DC converter module is electrically connected to the positive terminal of the load 9, the third terminal of the second DC-DC converter module is electrically connected to the negative terminal of the first power module 7, the negative terminal of the second power module 8 and the negative terminal of the load 9, and the fourth terminal of the second DC-DC converter module is electrically connected to the positive terminal of the second power module 8.

[0061] The second DC-DC converter module has at least two operating modes: a first operating mode and a second operating mode.

[0062] When the second DC-DC converter module is in the first working mode, the second power supply module 8 supplies power to the load 9;

[0063] When the second DC-DC converter module is in the second working mode, the first power supply module 7 and the second power supply module 8 simultaneously supply power to the load 9.

[0064] It should be noted that the negative and positive terminals of load 9 refer to the two ports on load 9 that are connected to the power supply, with the positive terminal connected to the positive terminal of the power supply and the negative terminal connected to the negative terminal. Specifically, when the second DC-DC converter module is in the first operating mode, the second power module 8 supplying power to load 9 means that the second power module 7 supplies power to load 9 independently, while the first power module 7 does not supply power to load 9.

[0065] In some embodiments, the first power module 7 can be a single power supply, or a power supply consisting of multiple power supplies connected in series, parallel, or a series-parallel combination. Similarly, the second power module 8 can be a single power supply, or a power supply consisting of multiple power supplies connected in series, parallel, or a series-parallel combination.

[0066] As can be seen, by controlling the operating mode of the second DC-DC converter module, the second power supply module can supply power to the load 9, or the first power supply module 7 and the second power supply module 8 can simultaneously supply power to the load 9. Both the first power supply module 7 and the second power supply module 8 can supply power to the load 9 through the second DC-DC converter module. When the power of one power supply is insufficient to meet the power demand of the load 9, the other power supply can supplement the power. At this time, the first power supply module 7 and the second power supply module 8 can simultaneously and continuously supply power to the load 9 through the second DC-DC converter module, improving the conversion efficiency of the circuit while ensuring power supply stability and reducing hardware costs.

[0067] In some embodiments, the second DC-DC conversion module includes:

[0068] The first terminal of the third switch module 3 is electrically connected to the positive terminal of the first power supply module.

[0069] The second inductor module 10 has its first end electrically connected to the second end of the third switch module 3, and its second end electrically connected to the positive terminal of the load 9.

[0070] The second switch module 2 has its first end electrically connected to the positive terminal of the second power supply module 8, and its second end electrically connected to the first end of the second inductor module 10.

[0071] The fifth switch module 5 has its first terminal electrically connected to the negative terminal of the first power module 7, the negative terminal of the second power module 8, and the negative terminal of the load 9, and its second terminal electrically connected to the first terminal of the second inductor module 10.

[0072] Among them, the first end of the third switch module 3 is the first end of the second DC-DC converter module, the second end of the second inductor module 10 is the second end of the second DC-DC converter module, the first end of the fifth switch module 5 is the third end of the second DC-DC converter module, and the first end of the second switch module 2 is the fourth end of the second DC-DC converter module.

[0073] In some embodiments, the second switch module 2, the third switch module 3, and the fifth switch module 5 all include switching transistors. The second switch module 2, the third switch module 3, and the fifth switch module 5 can be a single switching transistor or a combination of multiple switching transistors connected in parallel. In some embodiments, the partially open-ended modules can also be diodes. The types of switching transistors include, but are not limited to, insulated-gate bipolar transistors (IGBTs), bipolar transistors (BPTs), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), and thyristors, as long as they can achieve high-frequency switching functionality.

[0074] Furthermore, in some embodiments, the third switching module 3 includes a third MOSFET Q3 and a sixth diode D3. The first terminal of the sixth diode D3 is electrically connected to the positive terminal of the first power module 7, the second terminal of the sixth diode D3 is electrically connected to the first terminal of the third MOSFET Q3, and the second terminal of the third MOSFET Q3 is electrically connected to the first terminal of the second inductor module 10.

[0075] The second switching module 2 includes a second MOSFET Q2, the first end of which is electrically connected to the positive terminal of the second power module 8, and the second end of which is electrically connected to the first end of the second inductor module 10.

[0076] The fifth switch module 5 includes a fifth diode D2. The first end of the fifth diode D2 is electrically connected to the negative terminal of the load 9, the negative terminal of the first power supply module 7, and the negative terminal of the second power supply module 8. The second end of the fifth diode D2 is electrically connected to the first end of the second inductor module 10.

[0077] It should be noted that the second inductor module 10 can be a single inductor or a combination of multiple inductors connected in series, parallel, or in series and parallel. In some embodiments, the second inductor module 10 includes inductor L2.

[0078] Among them, the first terminal of the sixth diode is the first terminal of the second DC-DC converter module, the second terminal of the second inductor L2 is the second terminal of the second DC-DC converter module, the first terminal of the fifth diode D2 is the third terminal of the second DC-DC converter module, and the first terminal of the second MOSFET is the fourth terminal of the second DC-DC converter module.

[0079] It should be noted that the first terminal of the sixth diode D3 is the anode, and the second terminal of the sixth diode D3 is the cathode; the first terminal of the fifth diode D2 is the anode, and the second terminal of the fifth diode D2 is the cathode.

[0080] Preferably, both the third MOSFET Q3 and the second MOSFET Q2 are P-type MOSFETs, with the first terminal of the third MOSFET Q3 and the first terminal of the second MOSFET Q2 being the source, and the second terminal of the third MOSFET Q3 and the second terminal of the second MOSFET Q2 being the drain.

[0081] In some embodiments, the operating modes of the second DC-DC conversion module include mode one, mode two, and mode three;

[0082] When the second DC-DC converter module is in the first working mode, the second DC-DC converter module repeatedly switches between mode one and mode three;

[0083] When the second DC-DC converter module is in the second working mode, it cycles through mode one, mode two, and mode three in sequence. Alternatively, when the second DC-DC converter module is in the second working mode, it cycles through mode one, mode two, mode three, and mode two in sequence.

[0084] In some embodiments, when the second DC-DC conversion module is in mode one, the second switch module 2 is turned on, and the third switch module 3 and the fifth switch module 5 are blocked.

[0085] When the second DC-DC converter module is in mode two, the second switch module 2 is blocked, the third switch module 3 is turned on, and the fifth switch module 5 is blocked.

[0086] When the second DC-DC converter module is in mode three, the second switch module 2 is blocked, the third switch module 3 is blocked, and the fifth switch module 5 is turned on.

[0087] In some embodiments, when the second DC-DC converter module is in mode one, the second switch module 2 is turned on, and the third switch module 3 and the fifth switch module 5 are blocked. At this time, the current flows out from the positive terminal of the second power module 8, passes through the second switch module 2, the second inductor module 10, and the load 9 in sequence, and returns to the negative terminal of the second power module 8, so that the second power module 8 supplies power to the load 9, while the second inductor L2 stores energy.

[0088] When the second DC-DC converter module is in mode two, the second switch module 2 is blocked, the third switch module 3 is turned on, and the fifth switch module 5 is blocked. At this time, the current flows out from the positive terminal of the first power module 7, passes through the third switch module 3, the second inductor module 10, and the load 9 in sequence, and then returns to the negative terminal of the first power module 7, so that the first power module 7 supplies power to the load 9, while the second inductor L2 stores energy.

[0089] When the second DC-DC converter module is in mode three, the second switch module 2 is blocked, the third switch module 3 is blocked, and the fifth switch module 5 is turned on. At this time, the current flows out from the second end of the second inductor module 10, flows through the load 9 and the fifth switch module 5 in sequence, and then returns to the first end of the second inductor module 10. The second inductor module 10 uses the energy stored in mode one or mode two to supply power to the load 9.

[0090] It should be noted that "conduction" means that current can form a path through the corresponding switching module, while "blocking" means that current cannot form a path through the corresponding switching module.

[0091] It should be noted that when the first power module 7 is unavailable, the second DC-DC converter module is in its first operating mode, repeatedly switching between mode one and mode three. Mode one and mode three work together to change the output current or voltage of the second power module 8 to supply power to the load 9. The output current or voltage of the second power module 8 can be adjusted by regulating the duty cycle of the second switching module 2 and the fifth switching module 5 to meet the power demand of the load 9.

[0092] When the first power module 7 has the power supply conditions, but the energy is insufficient to meet the needs of the load 9, the second DC-DC converter module is in the second working mode. The second DC-DC converter module switches between mode one, mode two, and mode three in sequence. Alternatively, when the second DC-DC converter module is in the second working mode, the second DC-DC converter module switches between mode one, mode two, mode three, and mode two in sequence.

[0093] In some embodiments, the voltage of the first power module 7 and the voltage across the load 9 are both lower than the voltage of the second power module 8.

[0094] It should be noted that in mode two, the second terminal of the fifth diode D2 is connected to the first power module 7. At this time, the voltage at the second terminal of the fifth diode D2 is higher than the voltage at the first terminal of the fifth diode D2, and the fifth diode D2 is in the reverse cutoff state.

[0095] In mode one, the second terminal of the fifth diode D2 is connected to the second power module 8. At this time, the voltage at the second terminal of the fifth diode D2 is higher than the voltage at the first terminal of the fifth diode D2, and the fifth diode D2 is in the reverse cutoff state. At the same time, since the voltage of the first power module 7 is less than the voltage of the second power module 8, the sixth diode D3 is reverse cutoff. Therefore, the third switch module 3 can also be blocked when the third MOSFET is closed.

[0096] As can be seen, in both Mode 1 and Mode 2, the fifth diode D2 is reverse-biased and cut off. Furthermore, controlling the second MOSFET Q2 to turn on achieves the blocking of both the third switch module 3 and the fifth switch module 5; conversely, controlling the second MOSFET Q2 to turn off achieves the turning on of the third switch module 3 and the blocking of the fifth switch module 5. This application utilizes the forward conduction and reverse cut-off characteristics of diodes to reduce the impact of frequent switch closing and opening, while also simplifying the control logic.

[0097] In mode three, the voltage at the second terminal of inductor L2 is higher than the voltage at the first terminal of inductor L2, and the fifth diode D2 conducts. It should be noted that in mode three, when the third MOSFET Q3 is closed, the voltage of the first power supply module 7 is greater than the voltage at the first terminal of the second inductor L2, and the third switch module 3 conducts; therefore, blocking the third switch module 3 requires disconnecting the third MOSFET Q3.

[0098] It should be noted that when the second DC-DC converter module is in the second working mode, the first power module 7 and the second power module 8 are simultaneously supplying power to the load 9 for a period of time. Specifically, this refers to one cycle of the second DC-DC converter module in the cycle of mode one, mode two, and mode three, or one cycle of the second DC-DC converter module in the cycle of mode one, mode two, mode three, and mode two.

[0099] In some embodiments, the first power module 7 is a photovoltaic module PV, and the second power module 8 is a battery module BAT.

[0100] It should be noted that the second DC-DC converter sequentially switches between mode one, mode two, and mode three. This is achieved by controlling the duty cycles of the second switch module 2, the third switch module 3, and the fifth switch module 5; or by sequentially switching between mode one, mode two, mode three, and mode two. This is achieved by controlling the duty cycles of the second switch module 2, the first stage of the third switch module 3, the fifth switch module 5, and the second stage of the third switch module 3. In this way, the first power module 7 and the second power module 8 can simultaneously provide power to the load. If the first power module 7 is a photovoltaic (PV) module and the second power module 8 is a battery module (BAT), the maximum power point of the PV module needs to be tracked by controlling the duty cycles of each switch. All the power from the PV module should be provided to the load, with any shortfall being compensated by the battery module (BAT).

[0101] When the second DC-DC converter module is in the second working mode, and the second DC-DC converter module cycles through mode one, mode two, mode three, and mode two in sequence, the voltage at the first terminal of the second inductor module 10 is highest in mode one, gradually decreases in mode two and mode three, and gradually increases again when entering mode two. When entering the next cycle, it rises to the highest level in mode one. The voltage at the first terminal of the second inductor module 10 undergoes a process of gradually decreasing and then gradually increasing, which can effectively reduce the impact of voltage change on electronic components, reduce harmonics, and improve the stability and service life of the equipment.

[0102] Furthermore, in the second operating mode, when the output power of the photovoltaic module PV is less than the power required by the load 9, the first power module 7 and the second power module 8 simultaneously supply power to the load 9.

[0103] When the output power of the photovoltaic module PV exceeds the power required by the load 9, and the second power module 8 is not an energy storage component, the power of the photovoltaic module PV needs to be limited. When the second power module 8 is a battery module BAT, the excess energy can be used to charge the battery module BAT.

[0104] It should be noted that when the PV power of the photovoltaic module is sufficient to meet the needs of load 9, the second DC-DC converter module is in the third working mode. At this time, the second DC-DC converter module switches between mode two and mode three. By adjusting the duty cycle of the third switch module 3 and the fifth switch module 5, the output voltage or current of the photovoltaic module PV can be adjusted to meet the power demand of load 9.

[0105] Furthermore, in some embodiments, the first DC-DC conversion module includes:

[0106] The first inductor module 6, the first terminal of the first inductor module 6 is electrically connected to the positive terminal of the photovoltaic module PV;

[0107] The first switch module 1 has its first end electrically connected to the second end of the first inductor module 6, and its second end electrically connected to the negative terminal of the photovoltaic module PV and the negative terminal of the battery module BAT.

[0108] The fourth switch module 4 has its first end electrically connected to the second end of the first inductor module 6, and its second end electrically connected to the positive terminal of the battery module BAT.

[0109] It should be noted that the first inductor L1 can be a single inductor or a combination of multiple inductors connected in series, parallel, or in series and parallel; there are no restrictions here.

[0110] In some embodiments, the dual-power single-load supply circuit further includes:

[0111] The first filter module 11 has its first end electrically connected to the positive terminal of the first power module 7 and the first end of the third switch module 3, and its second end electrically connected to the negative terminal of the first power module 7.

[0112] The second filter module 12 has its first end electrically connected to the positive terminal of the second power module 8 and the first end of the second switch module 2, and its second end electrically connected to the negative terminal of the second power module 8.

[0113] The first end of the third filter module 13 is electrically connected to the second end of the second inductor module 10 and the positive terminal of the load 9, and the second end of the third filter module 13 is electrically connected to the first end of the fifth switch module 5 and the negative terminal of the load 9.

[0114] In some embodiments, the first filtering module 11 includes a first capacitor C1, which is used to filter out high-frequency noise from the first power supply, smooth the output voltage ripple of the first power supply module 7, and stabilize the output voltage of the first power supply. The second filtering module 12 includes a second capacitor C2, which is used to filter out high-frequency noise from the second power supply, smooth the output voltage harmonics of the second power supply module 8, and stabilize the output voltage of the second power supply. The third filtering module 13 includes a third capacitor C3, which is used to filter out high-frequency harmonics on the output side, smooth the output voltage of the power supply circuit, and provide a stable low-harmonic voltage for the load 9.

[0115] When the first power module 7 supplies power to the load 9, the first capacitor C1 and the third capacitor C3 filter the output voltage of the first power supply and the output voltage of the power supply circuit, respectively. Through two-stage filtering, a stable voltage is ensured to be supplied to the load 9. Similarly, when the first power module 7 supplies power to the load 9, the third capacitor C2 and the third capacitor C3 filter the output voltage of the second power supply and the output voltage of the power supply circuit, respectively. Through two-stage filtering, the stability of the power supply voltage is improved.

[0116] When the first switch module 1 is turned on and the second switch module 2 is turned off, current flows through the first inductor L1, and the first inductor L1 stores energy. After that, the first switch module 1 is turned off and the second switch module 2 is turned on. In this way, the alternating on and off of the first switch module 1 and the second switch module 2 can adjust the output voltage or current of the photovoltaic module PV to supply the battery module BAT, thus enabling the photovoltaic module PV to charge the battery module BAT.

[0117] In some embodiments, both the first switching module 1 and the fourth switching module 4 can be a single switching transistor, or a combination of multiple switching transistors connected in parallel. Some switching modules can also be diodes. The types of switching transistors include, but are not limited to, insulated-gate bipolar transistors, bipolar transistors, MOSFETs (MOS stands for Metal-Oxide-Semiconductor Field-Effect Transistor), and thyristors, as long as they can achieve high-frequency switching functionality.

[0118] In some embodiments, the first switching module 1 includes a first MOSFET Q1, the first end of the first MOSFET Q1 is electrically connected to the second end of the first inductor module 6, and the second end of the first MOSFET Q1 is electrically connected to the negative terminal of the photovoltaic module PV.

[0119] The fourth switch module 4 includes a fourth diode D1. The first end of the fourth diode D1 is electrically connected to the second end of the first inductor module 6, and the second end of the fourth diode D1 is electrically connected to the positive terminal of the battery module BAT.

[0120] It should be noted that the fourth switch module 4 uses a diode. By utilizing the forward conduction and reverse cutoff characteristics of the diode, the impact caused by frequent closing and opening of the switch can be reduced. At the same time, the control logic can be simplified.

[0121] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0122] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0123] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0124] The modules described above as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the purpose of this embodiment according to actual needs.

[0125] In addition, each functional module in the various embodiments of this application can be integrated into one processing unit, or each module can be a separate unit, or two or more modules can be integrated into one unit; the integrated modules can be implemented in hardware or in the form of hardware plus software functional units.

[0126] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0127] The above are merely embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-power-supply-single-load power supply circuit, characterized in that, include: First power supply module, second power supply module and second DC-DC converter module; The first terminal of the second DC-DC converter module is electrically connected to the positive terminal of the first power supply module, the second terminal of the second DC-DC converter module is electrically connected to the positive terminal of the load, the third terminal of the second DC-DC converter module is electrically connected to the negative terminal of the first power supply module, the negative terminal of the second power supply module, and the negative terminal of the load, and the fourth terminal of the second DC-DC converter module is electrically connected to the positive terminal of the second power supply module. The second DC-DC converter module has at least two operating modes: a first operating mode and a second operating mode. When the second DC-DC converter module is in the first working mode, the second power supply module supplies power to the load; When the second DC-DC converter module is in the second operating mode, the first power module and the second power module simultaneously supply power to the load.

2. The dual-power-supply-single-load power supply circuit according to claim 1, characterized in that, The second DC-DC conversion module includes: The third switch module, wherein the first terminal of the third switch module is electrically connected to the positive terminal of the first power supply module; The second inductor module has its first end electrically connected to the second end of the third switch module, and its second end electrically connected to the positive terminal of the load. The second switch module has its first terminal electrically connected to the positive terminal of the second power supply module, and its second terminal electrically connected to the first terminal of the second inductor module. The fifth switch module has its first terminal electrically connected to the negative terminal of the first power module, the negative terminal of the second power module, and the negative terminal of the load, and its second terminal electrically connected to the first terminal of the second inductor module. Wherein, the first end of the third switch module is the first end of the second DC-DC converter module, the second end of the second inductor module is the second end of the second DC-DC converter module, the first end of the fifth switch module is the third end of the second DC-DC converter module, and the first end of the second switch module is the fourth end of the second DC-DC converter module.

3. The dual-power-supply-single-load power supply circuit according to claim 2, characterized in that, The voltage of the first power module and the voltage across the load are both lower than the voltage of the second power module.

4. The dual-power-supply-single-load power supply circuit according to claim 3, characterized in that, The third switching module includes a third MOSFET and a sixth diode. The first terminal of the sixth diode is electrically connected to the positive terminal of the first power module, the second terminal of the sixth diode is electrically connected to the first terminal of the third MOSFET, and the second terminal of the third MOSFET is electrically connected to the first terminal of the second inductor module. The second switching module includes a second MOSFET, the first terminal of which is electrically connected to the positive terminal of the second power module, and the second terminal of which is electrically connected to the first terminal of the second inductor module. The fifth switching module includes a fifth diode. The first end of the fifth diode is electrically connected to the negative terminal of the load, the negative terminal of the first power supply module, and the negative terminal of the second power supply module. The second end of the fifth diode is electrically connected to the first end of the second inductor module.

5. A dual-power-supply single-load power supply circuit according to any one of claims 1 to 4, characterized in that, The operating modes of the second DC-DC conversion module include mode one, mode two, and mode three; When the second DC-DC converter module is in the first working mode, the second DC-DC converter module repeatedly switches between mode one and mode three; When the second DC-DC converter module is in the second working mode, the second DC-DC converter module cycles through mode one, mode two, and mode three in sequence; or, when the second DC-DC converter module is in the second working mode, the second DC-DC converter module cycles through mode one, mode two, mode three, and mode two in sequence.

6. A dual-power-supply-single-load power supply circuit according to claim 5, characterized in that: When the second DC-DC converter module is in mode one, the second switch module is turned on, and the third and fifth switch modules are turned off. When the second DC-DC converter module is in mode two, the second switch module is blocked, the third switch module is turned on, and the fifth switch module is blocked; When the second DC-DC converter module is in mode three, the second switch module is blocked, the third switch module is blocked, and the fifth switch module is turned on.

7. A dual-power-supply single-load power supply circuit according to claim 6, characterized in that, The first power module is a photovoltaic module, and the second power module is a battery module.

8. A dual-power-supply single-load power supply circuit according to claim 7, characterized in that, Includes a first DC-DC conversion module, the first DC-DC conversion module comprising: A first inductor module, wherein a first terminal of the first inductor module is electrically connected to the positive terminal of the photovoltaic module; The first switch module has a first terminal electrically connected to the second terminal of the first inductor module, and the second terminal of the first switch module is electrically connected to the negative terminal of the photovoltaic module and the negative terminal of the battery module. The fourth switch module has its first terminal electrically connected to the second terminal of the first inductor module, and its second terminal electrically connected to the positive terminal of the battery module.

9. A dual-power-supply single-load power supply circuit according to claim 2, characterized in that, include: The first filter module has its first end electrically connected to the positive terminal of the first power module and the first end of the third switch module, and its second end electrically connected to the negative terminal of the first power module. The second filter module has its first end electrically connected to the positive terminal of the second power module and the first end of the second switch module, and its second end electrically connected to the negative terminal of the second power module. The third filter module has its first end electrically connected to the second end of the second inductor module and the positive terminal of the load, and its second end electrically connected to the first end of the fifth switch module and the negative terminal of the load.

10. A dual-power-supply single-load power supply circuit according to claim 8, characterized in that, The first switching module includes a first MOSFET, the first terminal of which is electrically connected to the second terminal of the first inductor module, and the second terminal of which is electrically connected to the negative terminal of the photovoltaic module. The fourth switch module includes a fourth diode, the first end of which is electrically connected to the second end of the first inductor module, and the second end of which is electrically connected to the positive terminal of the battery module.

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