Multi-input photovoltaic inverter auxiliary power supply integrating alternating current and direct current

By integrating AC and DC multi-input photovoltaic inverter auxiliary power supplies, the problems of component quantity and circuit complexity in photovoltaic grid-connected energy storage systems are solved, stable and reliable power supply and simplified circuit design are achieved, thus improving system reliability.

CN223488112UActive Publication Date: 2025-10-28XIAN YIJIETUO ELECTRIC CO LTD
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Patent Information

Application Number
CN202421602518.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-09
Publication Date
2025-10-28
Estimated Expiration
2034-07-09

AI Technical Summary

Technical Problem

In existing photovoltaic grid-connected energy storage systems, two independent auxiliary sources need to be designed to process DC and AC inputs respectively, which increases the number of components and circuit complexity and reduces system reliability.

Method used

An integrated AC/DC multi-input photovoltaic inverter auxiliary power supply is designed. By integrating the DC side and AC side circuits, reverse diodes and insulating windings are used to achieve input circuit isolation and stable power supply, simplifying the circuit structure.

Benefits of technology

It achieves stable and reliable power supply under different input conditions, simplifies circuit design, and improves system reliability and component utilization efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a multi-input photovoltaic inverter auxiliary power supply integrating alternating current and direct current, which belongs to the field of power supply design and comprises a plurality of direct current side input circuits, an alternating current side power grid input circuit, an input winding and an output winding. The alternating current side power grid input circuit is an alternating current power supply and provides current for the circuit, the input winding is the input end of the multi-input photovoltaic inverter auxiliary power supply, the output winding is the output end of the multi-input photovoltaic inverter auxiliary power supply, and the direct current side input circuit comprises a photovoltaic input circuit and a battery input circuit. The direct-current side input circuit is connected with the first input winding, and the alternating-current side power grid input circuit is connected with the second input winding. The system can process the input of an AC power grid and the input of a DC power supply at the same time, and provides stable and reliable power supply for a photovoltaic grid-connected energy storage system.
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Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power supply, and in particular to an integrated AC / DC multi-input photovoltaic inverter auxiliary power supply. Background Technology

[0002] In power supply systems, auxiliary power sources are a crucial component for supplying power to various functional circuits. They need to meet the requirement of providing stable and reliable power supply under various input conditions and operating conditions.

[0003] However, for photovoltaic grid-connected energy storage systems, because they need to be connected to both the DC side (photovoltaic and battery input) and the AC side (grid), the DC and AC inputs need to be isolated, with enhanced insulation or double insulation, considering maintenance and safety. Therefore, in photovoltaic grid-connected energy storage products, designers need to design two relatively independent auxiliary power sources to correspond to the DC and AC inputs respectively. This approach increases the number of components and the complexity of the circuitry, reducing reliability. Utility Model Content

[0004] To overcome the above problems, this utility model provides an integrated AC / DC multi-input photovoltaic inverter auxiliary power supply, which solves the problem that existing photovoltaic grid-connected energy storage products require the design of two relatively independent auxiliary power sources to correspond to DC input and AC input respectively, thereby increasing the number of components and the complexity of the circuit, and reducing reliability.

[0005] To achieve the above objectives, the technical solution of this utility model is: an integrated AC / DC multi-input photovoltaic inverter auxiliary power supply, comprising multiple DC-side input circuits, an AC-side grid input circuit, an input winding, and an output winding. The DC-side input circuit provides current to the circuit from a DC power source, and the AC-side grid input circuit provides current to the circuit from an AC power source. The input winding is the input terminal of the multi-input photovoltaic inverter auxiliary power supply, and the output winding is the output terminal of the multi-input photovoltaic inverter auxiliary power supply. The DC-side input circuit includes a photovoltaic input circuit and a battery input circuit. The DC-side input circuit is connected to input winding one, and the AC-side grid input circuit is connected to input winding two.

[0006] Preferably, the photovoltaic input circuit includes a positive terminal of a bus capacitor, which is connected to one end of line one. The other end of line one is connected to one end of a first inverting diode, and the other end of the first inverting diode is connected to one end of line two. The other end of line two is connected to the E terminal of input winding one, the F terminal of input winding one is connected to one end of line five, and the other end of line five is connected to one end of a third inverting diode and ground. The other end of the third inverting diode is connected to one end of line six, and the other end of line six is ​​connected to the negative terminal of the bus capacitor.

[0007] Preferably, the battery input circuit includes a battery positive terminal, which is connected to one end of line three. The other end of line three is connected to one end of reverse diode two. The other end of reverse diode two is connected to one end of line four. The other end of line four is connected to the E terminal of input winding one. The F terminal of input winding one is connected to one end of line five. The other end of line five is connected to one end of reverse diode three. The other end of reverse diode three is connected to one end of line six. The other end of line six is ​​connected to the battery negative terminal.

[0008] Preferably, the AC power grid input circuit includes an AC live wire terminal, which is connected to one end of line seven. The other end of line seven is connected to the A terminal of the rectifier circuit. The B terminal of the rectifier circuit is connected to one end of line eight. The other end of line eight is connected to one end of the reverse diode four. The other end of the reverse diode four is connected to one end of line nine. The other end of line nine is connected to the G terminal of the input winding two. The H terminal of the input winding two is connected to one end of line ten. The other end of line ten is connected to the D terminal of the rectifier circuit and ground, respectively. The C terminal of the rectifier circuit is connected to one end of line fifteen. The other end of line fifteen is connected to the AC neutral wire terminal.

[0009] Preferably, the input winding one and the input winding two are reinforced with three layers of insulated wire.

[0010] Preferably, the output winding includes output winding one, output winding two, and output winding three.

[0011] Preferably, the rectifier circuit is a bridge rectifier circuit.

[0012] Preferably, the negative terminal of the battery is connected to the negative terminal of the bus capacitor.

[0013] Compared with existing solutions, the beneficial effects of this utility model are:

[0014] This utility model discloses an integrated AC / DC multi-input photovoltaic inverter auxiliary power supply, proposing an auxiliary power supply system that can integrate AC and DC inputs, simultaneously handling inputs from the AC grid and DC power sources, providing a stable and reliable power supply for photovoltaic grid-connected energy storage systems. Compared with traditional solutions, this power supply avoids increasing the number of components and the complexity of the circuit, simplifies the circuit design, and improves the reliability of the system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] like Figure 1 As shown in the figure, an embodiment of this utility model provides an integrated AC / DC multi-input photovoltaic inverter auxiliary power supply, including multiple DC-side input circuits, an AC-side grid input circuit, an input winding, and an output winding. The DC-side input circuit provides current to the circuit from a DC power source, and the AC-side grid input circuit provides current to the circuit from an AC power source. The input winding is the input terminal of the multi-input photovoltaic inverter auxiliary power supply, and the output winding is the output terminal of the multi-input photovoltaic inverter auxiliary power supply. The DC-side input circuit includes a photovoltaic input circuit and a battery input circuit. The DC-side input circuit is connected to input winding one, and the AC-side grid input circuit is connected to input winding two.

[0019] The photovoltaic input circuit includes a positive terminal of a bus capacitor, which is connected to one end of line one. The other end of line one is connected to one end of a reverse diode D1. The other end of reverse diode D1 is connected to one end of line two. The other end of line two is connected to the E terminal of input winding one. The F terminal of input winding one is connected to one end of line five. The other end of line five is connected to one end of reverse diode D3 and ground, respectively. The other end of reverse diode D3 is connected to one end of line six. The other end of line six is ​​connected to the negative terminal of the bus capacitor.

[0020] The battery input circuit includes a battery positive terminal, which is connected to one end of line three. The other end of line three is connected to one end of reverse diode D2. The other end of reverse diode D2 is connected to one end of line four. The other end of line four is connected to the E terminal of input winding one. The F terminal of input winding one is connected to one end of line five. The other end of line five is connected to one end of reverse diode D3. The other end of reverse diode D3 is connected to one end of line six. The other end of line six is ​​connected to the battery negative terminal, wherein the battery negative terminal is connected to the negative terminal of the bus capacitor.

[0021] The reverse diodes D1 and D2 isolate the photovoltaic input circuit and the battery input circuit. When the photovoltaic input circuit is supplying power normally, but the battery input circuit is low on power, the reverse diode D2 blocks the reverse current from the battery input circuit. When the battery input circuit is supplying power normally, but the photovoltaic input circuit is low on power, the reverse diode D1 blocks the reverse current from the photovoltaic input circuit. When both the photovoltaic input circuit and the battery are low on power, the reverse diode D3 blocks the current from the negative terminal of the bus capacitor to the first input winding.

[0022] The AC power grid input circuit includes an AC live wire terminal, which is connected to one end of line seven. The other end of line seven is connected to the A terminal of the rectifier circuit. The B terminal of the rectifier circuit is connected to one end of line eight. The other end of line eight is connected to one end of the reverse diode 4D4. The other end of the reverse diode 4D4 is connected to one end of line nine. The other end of line nine is connected to the G terminal of input winding two. The H terminal of input winding two is connected to one end of line ten. The other end of line ten is connected to the D terminal of the rectifier circuit and ground. The C terminal of the rectifier circuit is connected to one end of line fifteen. The other end of line fifteen is connected to the AC neutral wire terminal. When the AC power grid input circuit is not powered, the reverse diode 4D4 blocks the current from input winding two to the AC live wire terminal.

[0023] The input winding one and input winding two are reinforced with three layers of insulated wire.

[0024] The output windings include output winding one, output winding two, and output winding three. Output winding one is a +12V output, which supplies power to other electrical appliances in the system, such as DSP, MCU, and operational amplifier. Output winding two is a -12V output, which provides power to the operational amplifier, which requires both +12V and -12V power supplies. Output winding three is a VCC output, with a VCC voltage of 10~15V, which supplies power to the auxiliary power source chip itself.

[0025] The rectifier circuit is a bridge rectifier circuit. A diode 1 is placed between terminals A and B of the rectifier circuit. Terminal A of the rectifier circuit and the anode of diode 1 are connected by a wire, and the cathode of diode 1 is connected to terminal B of the rectifier circuit by a wire. A diode 2 is placed between terminals B and C of the rectifier circuit. Terminal B of the rectifier circuit and the cathode of diode 2 are connected by a wire, and the anode of diode 2 is connected to terminal C of the rectifier circuit by a wire. A diode 3 is placed between terminals C and D of the rectifier circuit. Terminal C of the rectifier circuit and the cathode of diode 3 are connected by a wire, and the anode of diode 3 is connected to terminal D of the rectifier circuit by a wire. A diode 4 is placed between terminals D and A of the rectifier circuit. Terminal D of the rectifier circuit and the anode of diode 4 are connected by a wire, and the cathode of diode 4 is connected to terminal A of the rectifier circuit by a wire.

[0026] Working principle:

[0027] Depending on the time of day, weather, grid power supply, whether the battery is connected, and the battery's energy storage status, photovoltaic grid-connected energy storage systems will encounter various input start-up conditions.

[0028] When the power grid is unavailable, if the photovoltaic voltage is low and the battery voltage is high, the battery input circuit operates through the input winding's flyback mechanism, and the output winding provides three power outputs to provide a stable power supply to the system. If the photovoltaic voltage is high and the battery voltage is low, the photovoltaic input circuit operates through the input winding's flyback mechanism, and the output winding provides three power outputs to provide a stable power supply to the system. If both the photovoltaic voltage and the battery voltage are high, the circuit with the highest photovoltaic and battery voltages operates through the input winding's flyback mechanism, and the output winding provides three power outputs to provide a stable power supply to the system.

[0029] When the photovoltaic voltage and battery voltage are low, the AC power from the grid, after passing through the rectifier circuit, operates through the input winding two flyback circuits to provide a stable power supply to the system.

[0030] When photovoltaic, battery, and grid AC power can all supply power simultaneously, input winding one and input winding two are actually a pair of forward-biased windings. In this case, both windings wound on the same magnetic core may generate induced electromotive forces in other windings. However, due to the presence of the anti-reverse diode, the induced voltage generated by the higher input voltage will clamp the lower input voltage. The DC-side input circuit and the AC-side grid input circuit will not supply power to the auxiliary power source simultaneously; the power supply sequence is determined by the voltage amplitudes of the grid AC power and the DC power supply.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated AC / DC multi-input photovoltaic inverter auxiliary power supply, characterized in that, It includes multiple DC-side input circuits, AC-side grid input circuits, input windings, and output windings. The DC-side input circuits provide current to the circuit from DC power, while the AC-side grid input circuits provide current to the circuit from AC power. The input windings are the input terminals of the auxiliary power supply for the multi-input photovoltaic inverter, and the output windings are the output terminals of the auxiliary power supply for the multi-input photovoltaic inverter. The DC-side input circuits include photovoltaic input circuits and battery input circuits. The DC-side input circuits are connected to input winding one, and the AC-side grid input circuits are connected to input winding two.

2. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 1, characterized in that, The photovoltaic input circuit includes a positive terminal of a bus capacitor, which is connected to one end of line one. The other end of line one is connected to one end of a first inverting diode, and the other end of the first inverting diode is connected to one end of line two. The other end of line two is connected to the E terminal of input winding one, the F terminal of input winding one is connected to one end of line five, and the other end of line five is connected to one end of a third inverting diode and ground. The other end of the third inverting diode is connected to one end of line six, and the other end of line six is ​​connected to the negative terminal of the bus capacitor.

3. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 2, characterized in that, The battery input circuit includes a battery positive terminal, which is connected to one end of line three. The other end of line three is connected to one end of reverse diode two. The other end of reverse diode two is connected to one end of line four. The other end of line four is connected to the E terminal of input winding one. The F terminal of input winding one is connected to one end of line five. The other end of line five is connected to one end of reverse diode three. The other end of reverse diode three is connected to one end of line six. The other end of line six is ​​connected to the battery negative terminal.

4. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 3, characterized in that, The AC power grid input circuit includes an AC live wire terminal, which is connected to one end of line seven. The other end of line seven is connected to the A terminal of the rectifier circuit. The B terminal of the rectifier circuit is connected to one end of line eight. The other end of line eight is connected to one end of the reverse diode four. The other end of the reverse diode four is connected to one end of line nine. The other end of line nine is connected to the G terminal of the input winding two. The H terminal of the input winding two is connected to one end of line ten. The other end of line ten is connected to the D terminal of the rectifier circuit and ground. The C terminal of the rectifier circuit is connected to one end of line fifteen. The other end of line fifteen is connected to the AC neutral wire terminal.

5. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 4, characterized in that, The input winding one and input winding two are reinforced with three layers of insulated wire.

6. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 5, characterized in that, The output windings include output winding one, output winding two, and output winding three.

7. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 6, characterized in that, The rectifier circuit mentioned is a bridge rectifier circuit.

8. The integrated AC / DC multi-input photovoltaic inverter auxiliary power supply according to claim 7, characterized in that, The negative terminal of the battery is connected to the negative terminal of the bus capacitor.