Power supply circuit and energy storage power supply
By using switching module cascade in the household energy storage system and single-pole double-throw relay to achieve priority allocation and electrical isolation of input sources, the problems of large number of devices, large size, high cost, large power consumption and safety risks in traditional multi-input source power supply solutions are solved, and circuit simplification and safety improvement are achieved.
Patent Information
- Application Number
- CN202422124673.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The traditional multi-input source power supply scheme has problems such as large number of devices, large size, high cost and high power consumption in household energy storage systems, and cannot achieve electrical isolation, which poses safety risks.
The cascade of multiple switching modules is adopted to achieve priority allocation of input sources through the connection and disconnection of switching modules, and electrical isolation is achieved using single-pole double-throw relays to simplify the circuit structure.
On the premise of achieving electrical isolation, the number of devices is reduced, cost and power consumption is reduced, and safety risks are avoided.
Smart Images
Figure CN223246326U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the utility model relate to the field of electronic technology, and in particular to a power supply circuit and an energy storage power supply. Background Art
[0002] Driven by falling prices for photovoltaic panels and inverters, as well as government policies, rooftop photovoltaics are being widely adopted. Excess electricity generated by rooftop photovoltaics needs to be sold to the grid. During periods of abundant sunlight, large amounts of photovoltaic power can reduce pressure on the grid. Against this backdrop, residential energy storage systems have garnered increasing attention, and installed capacity has increased annually. Residential energy storage systems (ESS) typically require intelligent distribution cabinets for better energy management, such as peak shaving and valley shifting, seamless backup, and intelligent diesel generator integration.
[0003] The auxiliary power supply for the Energy Management System (EMS) in a smart power distribution cabinet typically requires power from different input sources. For example, it should be able to draw power from the grid when power is available, and from other input sources such as energy storage units and diesel generators when power is lost.
[0004] Traditionally, to ensure the EMS auxiliary power supply can draw power from multiple input sources, multiple rectifier bridges are often used, each with independent inputs and parallel outputs. While this approach allows multiple input sources to power the ESS auxiliary power supply, it also creates a problem: the rectifier bridges are connected in series between the input sources, eliminating electrical isolation. This can pose safety risks in some situations. For example, if the grid loses power, the generator is not started, and the load is powered solely by the ESS, a single-point failure (a short-circuited diode in the rectifier bridge or high leakage current) could create a risk of energizing the generator or a line in the grid. To ensure electrical isolation between input sources, the traditional approach is to design an isolated power supply for each input source, connected to the load. However, this approach requires numerous components, is bulky, expensive, and consumes significant power, making its shortcomings particularly pronounced when there are a large number of input sources. Utility Model Content
[0005] The main technical problem solved by the embodiments of the present invention is to provide a power supply circuit and an energy storage power supply, which can avoid the problems of auxiliary power supply powered by multiple input sources, large number of components, large volume, high cost and high power consumption caused by setting up corresponding isolated power supplies.
[0006] To solve the above technical problems, one technical solution adopted by the present utility model is: to provide a power supply circuit, including: N switching modules, the second input end of each switching module is connected to a power supply; the output end of the i-th switching module is connected to the first input end of the (i + 1)-th switching module, where i is the serial number of the switching module and i < N; the first input end of the first switching module is connected to the output end of the first power supply, and the output end of the N-th switching module is connected to the input end of the auxiliary power supply; when there is voltage input at the second input end of the i-th switching module, the i-th switching module outputs the voltage received at its second input end to the next switching module; when there is no voltage input at the second input end of the i-th switching module, the i-th switching module outputs the voltage received at its first input end to the next switching module; when there is voltage input at the second input end of the N-th switching module, the N-th switching module outputs the voltage received at its second input end to charge the auxiliary power supply; when there is no voltage input at the second input end of the N-th switching module, the N-th switching module outputs the voltage received at its first input end to charge the auxiliary power supply.
[0007] In some embodiments, when there is voltage input at the second input end of the i-th switching module, the i-th switching module conducts the connection between the second input end and the output end, and disconnects the connection between the first connection end and the output end; when there is no voltage input at the second input end of the i-th switching module, the i-th switching module disconnects the connection between the second input end and the output end, and conducts the connection between the first connection end and the output end.
[0008] In some embodiments, when there is voltage input at the second input end of the N-th switching module, the N-th switching module conducts the connection between the second input end and the output end, and disconnects the connection between the first connection end and the output end; when there is no voltage input at the second input end of the N-th switching module, the i-th switching module disconnects the connection between the second input end and the output end, and conducts the connection between the first connection end and the output end.
[0009] In some embodiments, each of the N switching modules includes a single-pole double-throw relay, the output end of the i-th single-pole double-throw relay is connected to the first input end of the (i + 1)-th single-pole double-throw relay, the second input end of the i-th single-pole double-throw relay is connected to the corresponding power supply; the first input end of the first single-pole double-throw relay is connected to the output end of the first power supply, and the output end of the N-th single-pole double-throw relay is connected to the input end of the auxiliary power supply.
[0010] In some embodiments, the first pin of the i+1th single-pole double-throw relay is connected to the third pin of the i-th single-pole double-throw relay, the fourth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i-th single-pole double-throw relay, the second pin of the i+1th single-pole double-throw relay is connected to the positive pole of the corresponding power supply, and the fifth pin of the i+1th single-pole double-throw relay is connected to the negative pole of the corresponding power supply; the two ends of the coil of the i+1th single-pole double-throw relay are respectively connected to the positive pole and negative pole of the corresponding power supply.
[0011] In some embodiments, when there is voltage across the coil of the i+1th single-pole double-throw relay, the second pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fifth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay; when there is no voltage across the coil of the i+1th single-pole double-throw relay, the first pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fourth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay.
[0012] In some embodiments, the first pin of the first single-pole double-throw relay is connected to the positive pole of the first power supply, the fourth pin of the first single-pole double-throw relay is connected to the negative pole of the first power supply, the second pin of the first single-pole double-throw relay is connected to the positive pole of the corresponding power supply, and the fifth pin of the first single-pole double-throw relay is connected to the negative pole of the corresponding power supply; the two ends of the coil of the first single-pole double-throw relay are respectively connected to the positive pole and negative pole of the corresponding power supply.
[0013] In some embodiments, when there is voltage across the coil of the first single-pole double-throw relay, the second pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fifth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay; when there is no voltage across the coil of the first single-pole double-throw relay, the first pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fourth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay.
[0014] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide an energy storage power supply, including: an auxiliary power supply; and the power supply circuit as described above.
[0015] In some embodiments, the energy storage power supply further includes: a rectifier bridge; the output end of the power supply circuit is connected to the input end of the rectifier bridge, and the output end of the rectifier bridge is connected to the input end of the auxiliary power supply.
[0016] The beneficial effects of the present invention are as follows: unlike existing technologies, the present invention prioritizes input sources by providing multiple switching modules to match them, using a cascaded switching module configuration. When a voltage is input to the second input terminal of a switching module, the switching module outputs the corresponding voltage; otherwise, it outputs the voltage transmitted by the previous switching module. This reduces the number of components, simplifies the circuit, and reduces costs and power consumption while achieving electrical isolation when the auxiliary power supply draws power from multiple input sources. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of a power supply circuit of an auxiliary power supply;
[0018] Figure 2 It is a structural diagram of a power supply circuit of another auxiliary power supply;
[0019] Figure 3 This is a schematic structural diagram of a power supply circuit provided by an embodiment of the present utility model;
[0020] Figure 4 This is a circuit structure diagram of a power supply circuit provided by an embodiment of the utility model;
[0021] Figure 5 This is a circuit structure diagram of another power supply circuit provided by an embodiment of the present utility model;
[0022] Figure 6 It is a structural diagram of an energy storage power supply provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0023] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.
[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this utility model belongs. The terms used in this specification and in the description of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items.
[0025] Figure 1 It is a schematic structural diagram of the power supply circuit of the auxiliary power supply of the energy management unit in the existing intelligent power distribution cabinet. When the power grid is powered on, the auxiliary power supply 400 should be able to draw power from the power grid. After the power grid power outage, the auxiliary power supply 400 can obtain electrical energy from the power supply 101, the power supply 102, and the power supply 103 through the rectifier bridge 201, the rectifier bridge 202, or the rectifier bridge 203 respectively.
[0026] However Figure 1 Although the shown method can realize multiple power supplies to supply power to the auxiliary power supply, after the rectifier bridges are connected in series between each power supply and then connected together, electrical isolation cannot be achieved, which may bring safety risks.
[0027] Figure 2 It is a schematic structural diagram of another power supply circuit of the auxiliary power supply. It can be seen that Figure 2 The provided method solves Figure 1 the problem that the provided power supply circuit cannot achieve electrical isolation, that is, in Figure 2 , an isolation power supply is respectively connected to the output ends of the rectifier bridges connected by each power supply, and then they are converged to the auxiliary power supply 400. However, this method will inevitably bring problems such as a large number of devices, large volume, high cost, and high power consumption.
[0028] To better achieve the power supply of multiple power supplies to the auxiliary power supply on the basis of electrical isolation, the present invention provides a power supply circuit, and its schematic structural diagram is as Figure 3 shown. The power supply circuit includes N switching modules, namely switching module 501, switching module 501,..., and switching module 50N.
[0029] The second input end of each switching module is connected to a power supply, that is, the second input end of the switching module 501 is connected to the power supply 101, the second input end of the switching module 502 is connected to the power supply 102,..., and the second input end of the switching module 50N is connected to the power supply 10N.
[0030] The output end of the i-th switching module is connected to the first input end of the i + 1-th switching module, where i is the serial number of the switching module and i < N; the first input end of the first switching module is connected to the output end of the first power supply, and the output end of the N-th switching module is connected to the input end of the auxiliary power supply 400. That is, the first input end of the switching module 501 is connected to the power supply 100, the output end of the switching module 501 is connected to the first input end of the switching module 502, the output end of the switching module 502 is connected to the first input end of the next switching module,..., the first input end of the switching module 50N is connected to the output end of the previous switching module, and the output end of the switching module 50N is connected to the input end of the auxiliary power supply 400.
[0031] When there is voltage input to the second input terminal of the i-th switching module, the i-th switching module outputs the voltage received at its second input terminal to the next switching module; when there is no voltage input to the second input terminal of the i-th switching module, the i-th switching module outputs the voltage received at its first input terminal to the next switching module.
[0032] In an embodiment of the present application, when there is voltage input to the second input terminal of the i-th switching module, the i-th switching module connects the connection between the second input terminal and the output terminal, and disconnects the connection between the first connection terminal and the output terminal; when there is no voltage input to the second input terminal of the i-th switching module, the i-th switching module disconnects the connection between the second input terminal and the output terminal, and connects the connection between the first connection terminal and the output terminal.
[0033] When there is voltage input to the second input terminal of the Nth switching module, the Nth switching module outputs the voltage received at its second input terminal to charge the auxiliary power supply 400; when there is no voltage input to the second input terminal of the Nth switching module, the Nth switching module outputs the voltage received at its first input terminal to charge the auxiliary power supply 400.
[0034] In an embodiment of the present application, when there is voltage input to the second input terminal of the Nth switching module, the Nth switching module connects the connection between the second input terminal and the output terminal, and disconnects the connection between the first connection terminal and the output terminal; when there is no voltage input to the second input terminal of the Nth switching module, the i-th switching module disconnects the connection between the second input terminal and the output terminal, and connects the connection between the first connection terminal and the output terminal.
[0035] In some embodiments, the switching module may be composed of two switching tubes. When one of the switching tubes is turned on, the other is turned off. The driving voltage of the two switching tubes depends on the voltage of the second input terminal of the switching module. Taking the switching module 502 as an example, when the power supply 102 has a voltage input to the second input terminal of the switching module 502, the second switching tube in the switching module 502 is turned on and the first switching tube is turned off. Therefore, the switching module 502 will conduct the connection between its second input terminal and the output terminal, and output the voltage received at its second input terminal, that is, the voltage output by the power supply 102, to the next switching module; when the power supply 102 has no voltage input to the second input terminal of the switching module 502, the first switching tube in the switching module 502 is turned on and the second switching tube is turned off. Therefore, the switching module 502 will conduct the connection between its first input terminal and the output terminal, and output the voltage received at its first input terminal, that is, the output voltage of the switching module 501, to the next switching module.
[0036] In other embodiments, the switching module may be composed of a single-pole double-throw relay, and the power supply is connected to the second input terminal of the single-pole double-throw relay and also connected to the coil of the single-pole double-throw relay. When power is supplied to both ends of the coil, the connection between the second input terminal and the output terminal of the single-pole double-throw relay is connected, and the connection between the first input terminal and the output terminal is disconnected; when no power is supplied to both ends of the coil, the connection between the first input terminal and the output terminal of the single-pole double-throw relay is connected, and the connection between the second input terminal and the output terminal is disconnected.
[0037] Unlike existing technologies, this embodiment of the present invention prioritizes input sources by configuring multiple switching modules to match them. When a voltage is input to a switching module's second input, the module outputs the corresponding voltage; otherwise, it outputs the voltage passed by the previous switching module. This reduces the number of components, simplifies the circuit, and lowers cost and power consumption while achieving electrical isolation when the auxiliary power supply draws power from multiple input sources.
[0038] like Figure 4 As shown, each of the N switching modules includes a single-pole double-throw relay, the output end of the i-th single-pole double-throw relay is connected to the first input end of the i+1-th single-pole double-throw relay, and the second input end of the i-th single-pole double-throw relay is connected to the corresponding power supply; the first input end of the first single-pole double-throw relay is connected to the output end of the first power supply, and the output end of the N-th single-pole double-throw relay is connected to the input end of the auxiliary power supply.
[0039] The first pin of the i+1th single-pole double-throw relay is connected to the third pin of the i-th single-pole double-throw relay, the fourth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i-th single-pole double-throw relay, the second pin of the i+1th single-pole double-throw relay is connected to the positive pole of the corresponding power supply, and the fifth pin of the i+1th single-pole double-throw relay is connected to the negative pole of the corresponding power supply; the two ends of the coil of the i+1th single-pole double-throw relay are respectively connected to the positive pole and negative pole of the corresponding power supply.
[0040] That is, the first pin PIN1 of the single-pole double-throw relay RLY2 is connected to the third pin PIN3 of the single-pole double-throw relay RLY1, and the fourth pin PIN4 of the single-pole double-throw relay RLY2 is connected to the sixth pin PIN6 of the single-pole double-throw relay RLY1. The second pin PIN2 of the single-pole double-throw relay RLY2 is connected to the positive terminal of the power supply 102, and the fifth pin PIN5 of the single-pole double-throw relay RLY2 is connected to the negative terminal of the power supply 102. The two ends of the coil L2 of the single-pole double-throw relay RLY2 are respectively connected to the positive and negative terminals of the power supply 102. The subsequent single-pole double-throw relays are connected in the same manner.
[0041] When there is voltage across the coil of the i+1th single-pole double-throw relay, the second pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fifth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay; when there is no voltage across the coil of the i+1th single-pole double-throw relay, the first pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fourth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay.
[0042] Taking the single-pole double-throw relay RLY2 as an example, when there is voltage across the coil L2 of the single-pole double-throw relay RLY2, the second pin PIN2 of the single-pole double-throw relay RLY2 is connected to the third pin PIN3 of the single-pole double-throw relay RLY2, and the fifth pin PIN5 of the single-pole double-throw relay RLY2 is connected to the sixth pin PIN6 of the single-pole double-throw relay RLY2; when there is no voltage across the coil of the single-pole double-throw relay RLY2, the first pin PIN1 of the single-pole double-throw relay RLY2 is connected to the third pin PIN3 of the single-pole double-throw relay RLY2, and the fourth pin PIN4 of the single-pole double-throw relay RLY2 is connected to the sixth pin PIN6 of the single-pole double-throw relay RLY2.
[0043] It should be noted that the first pin of the first single-pole double-throw relay is connected to the positive pole of the first power supply, the fourth pin of the first single-pole double-throw relay is connected to the negative pole of the first power supply, the second pin of the first single-pole double-throw relay is connected to the positive pole of the corresponding power supply, and the fifth pin of the first single-pole double-throw relay is connected to the negative pole of the corresponding power supply; the two ends of the coil of the first single-pole double-throw relay are respectively connected to the positive pole and negative pole of the corresponding power supply.
[0044] That is, the first pin PIN1 of the single-pole double-throw relay PLY1 is connected to the positive electrode of the power supply 100, the fourth pin PIN4 of the single-pole double-throw relay PLY1 is connected to the negative electrode of the power supply 100, the second pin PIN2 of the single-pole double-throw relay PLY1 is connected to the positive electrode of the power supply 101, and the fifth pin PIN5 of the single-pole double-throw relay PLY1 is connected to the negative electrode of the power supply 101; the two ends of the coil L1 of the single-pole double-throw relay PLY1 are respectively connected to the positive electrode and the negative electrode of the power supply 101.
[0045] When there is voltage across the coil of the first single-pole double-throw relay, the second pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fifth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay; when there is no voltage across the coil of the first single-pole double-throw relay, the first pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fourth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay.
[0046] Figure 5 The circuit structure of another power supply circuit is shown. For the convenience of explanation, the power supply circuit includes two switching modules, namely switching module 501 and switching module 502. The switching modules also include fuses and varistors.
[0047] The switching module 501 includes a single-pole double-throw relay RLY1, fuses FU1, FU2, FU3, FU4, varistors RV1 and RV2, and the switching module 502 includes a single-pole double-throw relay RLY2, fuses FU5, FU6 and varistors RV3.
[0048] A first pin PIN1 of the single-pole double-throw relay PLY1 is connected to the second end of the fuse FU1, the first end of the fuse FU1 is connected to the first end of the varistor RV1 and the positive electrode of the power supply 100, a fourth pin PIN4 of the single-pole double-throw relay PLY1 is connected to the second end of the fuse FU2, the first end of the fuse FU2 is connected to the second end of the varistor RV1 and the negative electrode of the power supply 100; a second pin PIN2 of the single-pole double-throw relay PLY1 is connected to the second end of the fuse FU3, the first end of the fuse FU3 is connected to the first end of the varistor RV2 and the positive electrode of the power supply 101, a fifth pin PIN5 of the single-pole double-throw relay PLY1 is connected to the second end of the fuse FU4, the first end of the fuse FU4 is connected to the second end of the varistor RV2 and the negative electrode of the power supply 101; the two ends of the coil L1 of the single-pole double-throw relay PLY1 are respectively connected to the positive and negative electrodes of the power supply 101.
[0049] A first pin PIN1 of the single-pole double-throw relay RLY2 is connected to a third pin PIN3 of the single-pole double-throw relay RLY1, and a fourth pin PIN4 of the single-pole double-throw relay RLY2 is connected to a sixth pin PIN6 of the single-pole double-throw relay RLY1; a second pin PIN2 of the single-pole double-throw relay RLY2 is connected to a second end of the fuse FU5, a first end of the fuse FU5 is connected to a first end of the varistor RV3 and a positive electrode of the power supply 102, a fifth pin PIN5 of the single-pole double-throw relay RLY2 is connected to a second end of the fuse FU6, a first end of the fuse FU6 is connected to a second end of the varistor RV3 and a negative electrode of the power supply 102, and two ends of the coil L2 of the single-pole double-throw relay RLY2 are respectively connected to the positive and negative electrodes of the power supply 102; a third pin PIN3 of the single-pole double-throw relay RLY2 is connected to the positive input end of the subsequent load, and a sixth pin PIN6 of the single-pole double-throw relay RLY2 is connected to the negative input end of the subsequent load.
[0050] Specifically, when power source 102 is present, the coil of single-pole double-throw relay RLY2 is powered. The third pin PIN3 of single-pole double-throw relay RLY2 is connected to the second pin PIN2, and the sixth pin PIN6 is connected to the fifth pin PIN5. At this point, regardless of whether power sources 100 and 101 are present, and voltage is input to single-pole double-throw relay RLY1, the subsequent load is powered by power source 102. Similarly, when power source 102 is absent and power source 101 is present, the coil of single-pole double-throw relay RLY2 is not powered. The first pin PIN1 of single-pole double-throw relay RLY2 is connected to the third pin PIN3, and the fourth pin PIN4 is connected to the sixth pin PIN6. The coil of single-pole double-throw relay RLY1 is powered. The second pin PIN2 of single-pole double-throw relay RLY1 is connected to the third pin PIN3, and the fifth pin PIN5 is connected to the sixth pin PIN6. Regardless of whether power source 100 is present, the subsequent load is powered by power source 101. Similarly, when both power sources 101 and 102 are absent, the subsequent load is powered by power source 100. The priority of the three power supplies is: Power 102 > Power 101 > Power 100. The relay contacts provide complete electrical isolation between the power supplies, eliminating the safety risks associated with rectifier bridge failures (short circuits or increased leakage current).
[0051] Based on the power supply circuit provided in the above embodiment, the embodiment of the utility model further provides an energy storage power supply, the structural diagram of which is shown in FIG. Figure 6 As shown, the energy storage power supply includes a rectifier bridge 200, an auxiliary power supply 400 and the power supply circuit 10 as described in the above embodiment. The output end of the power supply circuit 10 is connected to the input end of the rectifier bridge 200, and the output end of the rectifier bridge 200 is connected to the input end of the auxiliary power supply 400.
[0052] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.
Claims
1. A power supply circuit, characterized in that: Including: N switching modules, and the second input terminal of each switching module is connected to a power supply; The output terminal of the i-th switching module is connected to the first input terminal of the (i + 1)-th switching module, where i is the serial number of the switching module and i < N; the first input terminal of the first switching module is connected to the output terminal of the first power supply, and the output terminal of the N-th switching module is connected to the input terminal of the auxiliary power supply; When there is a voltage input at the second input terminal of the i-th switching module, the i-th switching module outputs the voltage received at its second input terminal to the next switching module; When there is no voltage input at the second input terminal of the i-th switching module, the i-th switching module outputs the voltage received at its first input terminal to the next switching module; When there is a voltage input at the second input terminal of the N-th switching module, the N-th switching module outputs the voltage received at its second input terminal to charge the auxiliary power supply; When there is no voltage input at the second input terminal of the N-th switching module, the N-th switching module outputs the voltage received at its first input terminal to charge the auxiliary power supply.
2. The circuit according to claim 1, wherein When there is a voltage input at the second input terminal of the i-th switching module, the i-th switching module conducts the connection between the second input terminal and the output terminal, and disconnects the connection between the first connection terminal and the output terminal; When there is no voltage input at the second input terminal of the i-th switching module, the i-th switching module disconnects the connection between the second input terminal and the output terminal, and conducts the connection between the first connection terminal and the output terminal.
3. The circuit according to claim 1, wherein When there is a voltage input at the second input terminal of the N-th switching module, the N-th switching module conducts the connection between the second input terminal and the output terminal, and disconnects the connection between the first connection terminal and the output terminal; When there is no voltage input at the second input terminal of the N-th switching module, the i-th switching module disconnects the connection between the second input terminal and the output terminal, and conducts the connection between the first connection terminal and the output terminal.
4. The circuit according to claim 1, wherein Each of the N switching modules includes a single-pole double-throw relay, The output terminal of the i-th single-pole double-throw relay is connected to the first input terminal of the (i + 1)-th single-pole double-throw relay, and the second input terminal of the i-th single-pole double-throw relay is connected to the corresponding power supply; The first input terminal of the first single-pole double-throw relay is connected to the output terminal of the first power supply, and the output terminal of the N-th single-pole double-throw relay is connected to the input terminal of the auxiliary power supply. [[ID=I7]]5. The circuit according to claim 4, wherein The first pin of the (i + 1)-th single-pole double-throw relay is connected to the third pin of the i-th single-pole double-throw relay, the fourth pin of the (i + 1)-th single-pole double-throw relay is connected to the sixth pin of the i-th single-pole double-throw relay, the second pin of the (i + 1)-th single-pole double-throw relay is connected to the positive pole of the corresponding power supply, and the fifth pin of the (i + 1)-th single-pole double-throw relay is connected to the negative pole of the corresponding power supply; The two ends of the coil of the (i + 1)-th single-pole double-throw relay are respectively connected to the positive pole and the negative pole of the corresponding power supply.
6. The circuit according to claim 5, wherein When there is voltage across the coil of the i+1th single-pole double-throw relay, the second pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fifth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay; When there is no voltage across the coil of the i+1th single-pole double-throw relay, the first pin of the i+1th single-pole double-throw relay is connected to the third pin of the i+1th single-pole double-throw relay, and the fourth pin of the i+1th single-pole double-throw relay is connected to the sixth pin of the i+1th single-pole double-throw relay.
7. The circuit according to claim 4, characterized in that The first pin of the first single-pole double-throw relay is connected to the positive electrode of the first power supply, the fourth pin of the first single-pole double-throw relay is connected to the negative electrode of the first power supply, the second pin of the first single-pole double-throw relay is connected to the positive electrode of the corresponding power supply, and the fifth pin of the first single-pole double-throw relay is connected to the negative electrode of the corresponding power supply; The two ends of the coil of the first single-pole double-throw relay are connected to the positive and negative poles of the corresponding power supply respectively.
8. The circuit according to claim 1, wherein: When there is voltage across the coil of the first single-pole double-throw relay, the second pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fifth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay; When there is no voltage across the coil of the first single-pole double-throw relay, the first pin of the first single-pole double-throw relay is connected to the third pin of the first single-pole double-throw relay, and the fourth pin of the first single-pole double-throw relay is connected to the sixth pin of the first single-pole double-throw relay.
9. An energy storage power supply, characterized in that: include: Auxiliary power supply; The power supply circuit according to any one of claims 1 to 8.
10. The energy storage power supply according to claim 9, characterized in that: Also includes: Rectifier bridge; The output end of the power supply circuit is connected to the input end of the rectifier bridge, and the output end of the rectifier bridge is connected to the input end of the auxiliary power supply.