Flyback power supply device, energy storage converter system and energy storage system

Abstract

The utility model discloses a flyback power supply device, an energy storage converter system and an energy storage system, and relates to the technical field of energy storage converters, the flyback power supply device comprises a rectification circuit, a flyback switching power supply circuit and a voltage limiting circuit; the voltage limiting circuit is connected between the output end of the rectifying circuit and the input end of the flyback switching power supply circuit and used for limiting the magnitude of the output voltage output by the rectifying circuit to the flyback switching power supply circuit. According to the flyback switching power supply circuit, the construction cost of the flyback switching power supply circuit can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage converters, in particular to a flyback power supply device, an energy storage converter system and an energy storage system. Background Technique

[0002] In view of the fact that energy storage converters (Power Conversion System, PCS) generally need to adapt to diverse application scenarios, it is required that the energy storage converter can still maintain the continuous operation of standby and communication functions in the case of no power supply on the photovoltaic side. To achieve this goal, a common solution is to draw power from the AC side and use a power supply IC (Integrated Circuit), MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), a flyback transformer and a series of peripheral circuits to construct a flyback switching power supply circuit.

[0003] However, to ensure that the constructed flyback switching power supply circuit has a good power supply effect, it is usually necessary to select MOSFETs with a higher breakdown voltage to construct the flyback switching power supply circuit, which will increase the construction cost of the flyback switching power supply circuit. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a flyback power supply device, aiming to reduce the construction cost of the flyback switching power supply circuit.

[0005] To achieve the above object, the utility model proposes a flyback power supply device, which includes:

[0006] A rectifier circuit;

[0007] A flyback switching power supply circuit;

[0008] A voltage limiting circuit, which is connected between the output end of the rectifier circuit and the input end of the flyback switching power supply circuit, and is used to limit the magnitude of the output voltage output by the rectifier circuit to the flyback switching power supply circuit.

[0009] In one embodiment, the voltage limiting circuit includes:

[0010] A first switching tube, the drain of the first switching tube is connected to the output end of the rectifier circuit, and the source of the first switching tube is connected to the input end of the flyback switching power supply circuit;

[0011] A voltage-limiting trigger module, the first end of the voltage-limiting trigger module is respectively connected to the output end of the rectification circuit and the drain of the first switching transistor, the output end of the voltage-limiting trigger module is connected to the gate of the first switching transistor, and the second end of the voltage-limiting trigger module is respectively connected to the source of the first switching transistor and the input end of the flyback switching power supply circuit;

[0012] The voltage-limiting trigger module is used to trigger the first switching transistor to turn off after receiving the output voltage output by the rectification circuit, so as to limit the magnitude of the output voltage output by the rectification circuit to the flyback switching power supply circuit.

[0013] In one embodiment, the voltage-limiting trigger module includes a second switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first zener diode, a second zener diode, and a first capacitor;

[0014] The first end of the first resistor is respectively connected to the output end of the rectification circuit and the first end of the second resistor, the second end of the first resistor is respectively connected to the gate of the second switching transistor and the first end of the third resistor, the first end of the third resistor is respectively connected to the first end of the fourth resistor and the cathode of the first zener diode, and the second end of the third resistor, the second end of the fourth resistor, and the anode of the first zener diode are grounded;

[0015] The first end of the second resistor is connected to the drain of the first switching transistor, the second end of the second resistor is respectively connected to the drain of the second switching transistor and the first end of the fifth resistor, the second end of the fifth resistor is respectively connected to the gate of the first switching transistor and the cathode of the second zener diode, the first end of the first capacitor is respectively connected to the source of the first switching transistor and the input end of the flyback switching power supply circuit, and the source of the second switching transistor, the anode of the second zener diode, and the second end of the first capacitor are grounded.

[0016] In one embodiment, the flyback switching power supply circuit includes:

[0017] An RCD absorption module;

[0018] A transformer, the primary coil wound around the magnetic core of the transformer is connected to the RCD absorption module;

[0019] An output rectification module, the output rectification module is connected to the first secondary coil wound around the magnetic core of the transformer;

[0020] A voltage feedback module, the voltage feedback module is respectively connected to the output end of the output rectification module and the second secondary coil wound around the magnetic core of the transformer;

[0021] A sixth resistor and a seventh resistor, wherein a first end of the sixth resistor is respectively connected to the voltage limiting circuit and the RCD absorption module, and a first end of the seventh resistor is grounded;

[0022] A Topswitch power chip, wherein a drain pin of a switching transistor of the Topswitch power chip is connected to a second end of the sixth resistor, an undervoltage and overvoltage monitoring pin of the Topswitch power chip is connected to the RCD absorption module, a feedback control pin of the Topswitch power chip is connected to the voltage feedback module, an external current limiting control pin of the Topswitch power chip is connected to a second end of the seventh resistor, and a source pin and a frequency setting pin of the switching transistor of the Topswitch power chip are grounded.

[0023] In one embodiment, the RCD absorption module includes an eighth resistor, a second capacitor, and a first diode;

[0024] A first end of the eighth resistor is respectively connected to a first end of the sixth resistor and a first end of the second capacitor, a second end of the eighth resistor is respectively connected to a second end of the second capacitor and a cathode of the first diode, a first end of the second capacitor and an anode of the first diode are connected to the primary coil, and an anode of the first diode is connected to the undervoltage and overvoltage monitoring pin of the Topswitch power chip.

[0025] In one embodiment, the output rectification module includes a second diode and a third capacitor;

[0026] An anode of the second diode and a first end of the third capacitor are connected to the first secondary coil, a cathode of the second diode is respectively connected to a second end of the third capacitor and the voltage feedback module, and a first end of the third capacitor is connected to the voltage feedback module.

[0027] In one embodiment, the voltage feedback module includes a third zener diode, a ninth resistor, an optocoupler, a third diode, a fourth capacitor, and a fifth capacitor;

[0028] A cathode of the third zener diode is connected to a positive output end of the output rectification module, an anode of the third zener diode is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to an anode of the optocoupler, and a cathode of the optocoupler is connected to a negative output end of the output rectification module;

[0029] The anode of the third diode and the first end of the fourth capacitor are connected to the second secondary coil. The cathode of the third diode is respectively connected to the second end of the fourth capacitor and the emitter of the optocoupler. The collector of the optocoupler is respectively connected to the feedback control pin of the Topswitch power chip and the first end of the fifth capacitor. The first end of the fourth capacitor and the second end of the fifth capacitor are grounded.

[0030] In one embodiment, the rectification circuit includes a rectifier bridge and a sixth capacitor;

[0031] The positive output terminal of the rectifier bridge is respectively connected to the first end of the sixth capacitor and the voltage limiting circuit. The negative output terminal of the rectifier bridge and the second end of the sixth capacitor are grounded.

[0032] In addition, to achieve the above object, the present invention further provides an energy storage converter system, which includes an energy storage converter and the above flyback power supply device, and the AC side of the energy storage converter is connected to the input end of the flyback power supply device.

[0033] In addition, to achieve the above object, the present invention further provides an energy storage system, which includes a photovoltaic module, a battery module, an energy storage converter, a power grid, a load, and the above flyback power supply device;

[0034] The DC side of the energy storage converter is respectively connected to the photovoltaic module and the battery module, and the AC side of the energy storage converter is respectively connected to the input end of the flyback power supply device, the power grid, and the load.

[0035] The present invention provides a flyback power supply device, which includes a rectification circuit, a flyback switching power supply circuit, and a voltage limiting circuit; the voltage limiting circuit is connected between the output end of the rectification circuit and the input end of the flyback switching power supply circuit, and is used to limit the magnitude of the output voltage output from the rectification circuit to the flyback switching power supply circuit.

[0036] Therefore, the present invention limits the magnitude of the output voltage output from the rectification circuit to the flyback switching power supply circuit by arranging a voltage limiting circuit between the output end of the rectification circuit and the input end of the flyback switching power supply circuit, so that the flyback switching power supply circuit can achieve a better power supply effect without using a MOSFET with a higher breakdown voltage, and the construction cost of the flyback switching power supply circuit is reduced. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0038] Figure 1 Schematic structural diagram of the flyback power supply device provided by the first embodiment of the present invention;

[0039] Figure 2 Schematic circuit diagram of the rectifier circuit provided by the first embodiment of the present invention;

[0040] Figure 3 Schematic structural diagram of the flyback power supply device provided by the first embodiment of the present invention when the voltage limiting circuit includes a first switching tube and a voltage limiting trigger module;

[0041] Figure 4 Schematic circuit diagram of the voltage limiting circuit provided by the first embodiment of the present invention;

[0042] Figure 5 Schematic structural diagram of the flyback power supply device provided by the second embodiment of the present invention;

[0043] Figure 6 Schematic circuit diagram of the flyback switching power supply circuit provided by the second embodiment of the present invention;

[0044] Figure 7 Schematic module diagram of the energy storage converter system provided by the embodiment of the present invention;

[0045] Figure 8 Schematic module diagram of the energy storage system provided by the embodiment of the present invention.

[0046] The realization of the object, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

[0047] Explanation of the reference numerals in the drawings:

[0048] 10. Rectifier circuit; 20. Flyback switching power supply circuit; 30. Voltage limiting circuit; 21. RCD absorption module; 22. Output rectification module; 23. Voltage feedback module; 31. Voltage limiting trigger module; Q1 - Q2. Switching transistors; C1 - C6. Capacitors; R1 - R9. Resistors; B1 - B3. Zener diodes; D1 - D3. Diodes; BR1. Rectifier bridge; T1. Transformer; 101. Primary coil; 102. First secondary coil; 103. Second secondary coil; U1. Topswitch power chip; D. Drain pin of the switching transistor; Y. Frequency setting pin; S. Source pin of the switching transistor; X. External current limiting control pin; F. Frequency setting pin; C. Feedback control pin; U2. Optocoupler; GND. Ground; 100. Energy storage converter; 200. Photovoltaic module; 300. Battery module; 400. Power grid; 500. Load; AC. Alternating current; DC. Direct current. Detailed implementation manners

[0049] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] It should be noted that the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0052] In view of the fact that energy storage converters generally need to adapt to diverse application scenarios, it is required that the energy storage converter can still maintain the continuous operation of standby and communication functions in the case of no power supply on the photovoltaic side. To achieve this goal, a common solution is to draw power from the AC side and use a power supply IC, MOSFET, flyback transformer, and a series of peripheral circuits to construct a flyback switching power supply circuit.

[0053] However, to ensure that the constructed flyback switching power supply circuit has a good power supply effect, it is usually necessary to select a MOSFET with a relatively high breakdown voltage to construct the flyback switching power supply circuit, which will increase the construction cost of the flyback switching power supply circuit.

[0054] Based on this, the present utility model provides a flyback power supply device. In the first embodiment of the present utility model, please refer to Figure 1 , the flyback power supply device includes a rectification circuit 10, a flyback switching power supply circuit 20, and a voltage limiting circuit 30; the voltage limiting circuit 30 is connected between the output end of the rectification circuit 10 and the input end of the flyback switching power supply circuit 20, and is used to limit the magnitude of the output voltage output from the rectification circuit 10 to the flyback switching power supply circuit 20.

[0055] It should be noted that the rectification circuit 10 is a circuit that converts alternating current into direct current. The rectification circuit 10 can be a structure composed of a rectifier bridge BR1 and a sixth capacitor C6 as shown in Figure 2 , or can be composed of other circuit components (for example, composed of a transformer, a rectification main circuit, and a filter, etc.). The present embodiment does not specifically limit the structure of the rectification circuit 10.

[0056] Among them, in the case where the rectification circuit 10 is composed of a rectifier bridge BR1 and a sixth capacitor C6, the positive output end of the rectifier bridge BR1 is respectively connected to the first end of the sixth capacitor C6 and the voltage limiting circuit 30, and the negative output end of the rectifier bridge BR1 and the second end of the sixth capacitor C6 are grounded to GND.

[0057] In addition, it should be noted that the flyback switching power supply circuit 20 can be composed of a power supply IC, a MOSFET, a flyback transformer, and a series of peripheral circuits, or can be composed of other circuit components (for example, it can be the structure of the flyback switching power supply circuit 20 mentioned in the following second embodiment). The present embodiment does not specifically limit the structure of the flyback switching power supply circuit 20.

[0058] In this embodiment, by setting a voltage limiting circuit 30 between the output end of the rectification circuit 10 and the input end of the flyback switching power supply circuit 20 to limit the magnitude of the output voltage output from the rectification circuit 10 to the flyback switching power supply circuit 20, the flyback switching power supply circuit 20 can achieve a good power supply effect without using a MOSFET with a relatively high breakdown voltage, thereby reducing the construction cost of the flyback switching power supply circuit 20.

[0059] In a feasible implementation, please refer to Figure 3, the voltage limiting circuit 30 may include a first switching transistor Q1 and a voltage limiting trigger module 31; the drain of the first switching transistor Q1 is connected to the output end of the rectifying circuit 10, and the source of the first switching transistor Q1 is connected to the input end of the flyback switching power supply circuit 20; the first end of the voltage limiting trigger module 31 is respectively connected to the output end of the rectifying circuit 10 and the drain of the first switching transistor Q1, the output end of the voltage limiting trigger module 31 is connected to the gate of the first switching transistor Q1, and the second end of the voltage limiting trigger module 31 is respectively connected to the source of the first switching transistor Q1 and the input end of the flyback switching power supply circuit 20; the voltage limiting trigger module 31 is configured to trigger the first switching transistor Q1 to turn off after receiving the output voltage output by the rectifying circuit 10, so as to limit the magnitude of the output voltage output by the rectifying circuit 10 to the flyback switching power supply circuit 20.

[0060] It should be noted that the switching transistor may be a MOS transistor, a triode, an IGBT (Insulated Gate Bipolar Transistor), or other types of field effect transistors, etc. This embodiment does not make specific limitations on this.

[0061] In this embodiment, by setting the voltage limiting circuit 30 to be composed of the first switching transistor Q1 and the voltage limiting trigger module 31, after the voltage limiting trigger module 31 receives the output voltage output by the rectifying circuit 10, the first switching transistor Q1 will be triggered to turn off. Thus, the voltage of the source of the first switching transistor Q1 no longer rises, and the magnitude of the output voltage output by the rectifying circuit 10 to the flyback switching power supply circuit 20 is limited. Therefore, the flyback switching power supply circuit 20 can achieve a better power supply effect without using a MOSFET with a higher withstand voltage value, reducing the construction cost of the flyback switching power supply circuit 20.

[0062] Further, in a feasible embodiment, please refer to Figure 4, the voltage limiting trigger module 31 may include a second switching transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first voltage stabilizing diode B1, a second voltage stabilizing diode B2, and a first capacitor C1; the first end of the first resistor R1 is respectively connected to the output end of the rectifying circuit 10 and the first end of the second resistor R2, the second end of the first resistor R1 is respectively connected to the gate of the second switching transistor Q2 and the first end of the third resistor R3, the first end of the third resistor R3 is respectively connected to the first end of the fourth resistor R4 and the cathode of the first voltage stabilizing diode B1, and the second end of the third resistor R3, the second end of the fourth resistor R4, and the anode of the first voltage stabilizing diode B1 are grounded to GND; the first end of the second resistor R2 is connected to the drain of the first switching transistor Q1, the second end of the second resistor R2 is respectively connected to the drain of the second switching transistor Q2 and the first end of the fifth resistor R5, the second end of the fifth resistor R5 is respectively connected to the gate of the first switching transistor Q1 and the cathode of the second voltage stabilizing diode B2, the first end of the first capacitor C1 is respectively connected to the source of the first switching transistor Q1 and the input end of the flyback switching power supply circuit 20, and the source of the second switching transistor Q2, the anode of the second voltage stabilizing diode B2, and the second end of the first capacitor C1 are grounded to GND.

[0063] It can be understood that after the voltage limiting trigger module 31 receives the output voltage output by the rectifying circuit 10, the second switching transistor Q2 will conduct. Thus, the gate of the first switching transistor Q1 will be grounded to GND, and the gate voltage of the first switching transistor Q1 will no longer be greater than the source voltage of the first switching transistor Q1, so that the first switching transistor Q1 will turn off.

[0064] Current flyback switching power supply circuits usually use independent MOSFETs and PWM (Pulse Width Modulation) controllers, and using independent MOSFETs and PWM controllers usually requires corresponding circuit components to achieve their respective functions. This results in a relatively large number of circuit components required in the construction of the flyback switching power supply circuit, a relatively complex design, and insufficient circuit stability.

[0065] Based on the above first embodiment, a second embodiment of the flyback power supply device of the present invention is proposed. In the second embodiment, please refer to Figure 5 , the flyback switching power supply circuit 20 may include an RCD absorption module 21, a transformer T1, an output rectifying module 22, a voltage feedback module 23, a sixth resistor R6, a seventh resistor R7, and a Topswitch power chip U1;

[0066] The primary coil 101 wound around the core of the transformer T1 is connected to the RCD absorption module 21. The output rectification module 22 is connected to the first secondary coil 102 wound around the core of the transformer T1. The voltage feedback module 23 is respectively connected to the output terminal of the output rectification module 22 and the second secondary coil 103 wound around the core of the transformer T1. The first end of the sixth resistor R6 is respectively connected to the voltage limiting circuit 30 and the RCD absorption module 21. The first end of the seventh resistor R7 is grounded. The drain pin D of the switching transistor of the Topswitch power chip U1 is connected to the second end of the sixth resistor R6. The undervoltage and overvoltage monitoring pin Y of the Topswitch power chip U1 is connected to the RCD absorption module 21. The feedback control pin C of the Topswitch power chip U1 is connected to the voltage feedback module 23. The external current limiting control pin X of the Topswitch power chip U1 is connected to the second end of the seventh resistor R7. The source pin S and the frequency setting pin F of the switching transistor of the Topswitch power chip U1 are grounded to GND.

[0067] It should be noted that the Topswitch power chip U1 is a series of high-efficiency integrated power conversion chips launched by POWER Integrations Inc. in the United States. This chip integrates the PWM controller and the MOSFET on the same chip, greatly simplifying the design of the power circuit and improving the efficiency and reliability of the power circuit.

[0068] In addition, it should be noted that the function of the RCD absorption module 21 is to absorb the leakage inductance energy in the circuit to prevent the voltage integral accumulation caused by the leakage inductance energy when the switching element of the flyback switching power supply circuit 20 is turned off, so as to ensure the stable operation of the flyback switching power supply circuit 20. The output rectification module 22 is used to rectify the voltage output by the first secondary coil 102 of the transformer T1. The voltage feedback module 23 is used to feedback the output voltage of the flyback switching power supply circuit 20 to modulate the output voltage of the flyback switching power supply circuit 20 to a set value. The RCD absorption module 21, the output rectification module 22 and the voltage feedback module 23 can all be flexibly set according to the actual situation, and this embodiment does not make specific limitations on this. For example, please refer to Figure 6 , the RCD absorption module 21 may include the eighth resistor R8, the second capacitor C2 and the first diode D1; the output rectification module 22 may include the second diode D2 and the third capacitor C3; the voltage feedback module 23 may include the third zener diode B3, the ninth resistor R9, the optocoupler U2, the third diode D3, the fourth capacitor C4 and the fifth capacitor C5;

[0069] The first end of the eighth resistor R8 is respectively connected to the first end of the sixth resistor R6 and the first end of the second capacitor C2. The second end of the eighth resistor R8 is respectively connected to the second end of the second capacitor C2 and the cathode of the first diode D1. The first end of the second capacitor C2 and the anode of the first diode D1 are connected to the primary coil 101. The anode of the first diode D1 is connected to the undervoltage and overvoltage monitoring pin Y of the Topswitch power chip U1;

[0070] The anode of the second diode D2 and the first end of the third capacitor C3 are connected to the first secondary coil 102. The cathode of the second diode D2 (i.e., the positive output end of the output rectification module 22) is respectively connected to the second end of the third capacitor C3 and the cathode of the third voltage stabilizing diode B3. The first end of the third capacitor C3 (i.e., the negative output end of the output rectification module 22) is connected to the cathode of the optocoupler U2;

[0071] The anode of the third voltage stabilizing diode B3 is connected to the first end of the ninth resistor R9. The second end of the ninth resistor R9 is connected to the anode of the optocoupler U2. The anode of the third diode D3 and the first end of the fourth capacitor C4 are connected to the second secondary coil 103. The cathode of the third diode D3 is respectively connected to the second end of the fourth capacitor C4 and the emitter of the optocoupler U2. The collector of the optocoupler U2 is respectively connected to the feedback control pin C of the Topswitch power chip U1 and the first end of the fifth capacitor C5. The first end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are grounded to GND.

[0072] In this embodiment, by using the Topswitch power chip U1 integrated with a PWM controller and a MOSFET, a flyback switching power supply circuit 20 is constructed. Thus, there is no need to additionally install corresponding circuit components. By directly operating the Topswitch power chip U1, the functions of the PWM controller and the MOSFET can be realized respectively. This not only simplifies the design of the flyback switching power supply circuit 20, but also improves the stability of the flyback switching power supply circuit 20.

[0073] The present utility model further provides an energy storage converter system. Please refer to Figure 7 The energy storage converter system includes an energy storage converter 100 and the above flyback power supply device. The AC side AC of the energy storage converter 100 is connected to the input end of the flyback power supply device (i.e., the input end of the rectification circuit 10). The structure of the flyback power supply device can refer to the above embodiment and will not be elaborated here. Naturally, since the energy storage converter system of this embodiment includes all the technical solutions of all the above embodiments of the flyback power supply device and the achieved technical effects are exactly the same, they will not be elaborated here.

[0074] The present utility model further provides an energy storage system. Please refer to Figure 8, the energy storage system includes a photovoltaic module 200, a battery module 300, an energy storage inverter 100, a power grid 400, a load 500, and the above flyback power supply device. The DC side DC of the energy storage inverter 100 is respectively connected to the photovoltaic module 200 and the battery module 300, and the AC side AC of the energy storage inverter 100 is respectively connected to the input end of the flyback power supply device, the power grid 400, and the load 500. The structure of the flyback power supply device can refer to the above embodiments and will not be elaborated here. Naturally, since the energy storage system of this embodiment includes all the technical solutions of all the above embodiments of the flyback power supply device and the achieved technical effects are also exactly the same, they will not be elaborated here.

[0075] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A flyback power supply device, characterized in that, The flyback power supply device includes: A rectification circuit; A flyback switching power supply circuit; A voltage limiting circuit connected between the output end of the rectification circuit and the input end of the flyback switching power supply circuit for limiting the magnitude of the output voltage output from the rectification circuit to the flyback switching power supply circuit.

2. The flyback power supply device according to claim 1, characterized in that, The voltage limiting circuit includes: A first switching transistor, the drain of the first switching transistor is connected to the output end of the rectification circuit, and the source of the first switching transistor is connected to the input end of the flyback switching power supply circuit; A voltage limiting trigger module, the first end of the voltage limiting trigger module is respectively connected to the output end of the rectification circuit and the drain of the first switching transistor, the output end of the voltage limiting trigger module is connected to the gate of the first switching transistor, and the second end of the voltage limiting trigger module is respectively connected to the source of the first switching transistor and the input end of the flyback switching power supply circuit; The voltage limiting trigger module is used for triggering the first switching transistor to turn off after receiving the output voltage output from the rectification circuit, so as to limit the magnitude of the output voltage output from the rectification circuit to the flyback switching power supply circuit.

3. The flyback power supply device according to claim 2, wherein The voltage limiting trigger module includes a second switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first zener diode, a second zener diode and a first capacitor; The first end of the first resistor is respectively connected to the output end of the rectification circuit and the first end of the second resistor, the second end of the first resistor is respectively connected to the gate of the second switching transistor and the first end of the third resistor, the first end of the third resistor is respectively connected to the first end of the fourth resistor and the cathode of the first zener diode, and the second end of the third resistor, the second end of the fourth resistor and the anode of the first zener diode are grounded; The first end of the second resistor is connected to the drain of the first switching transistor, the second end of the second resistor is respectively connected to the drain of the second switching transistor and the first end of the fifth resistor, the second end of the fifth resistor is respectively connected to the gate of the first switching transistor and the cathode of the second zener diode, the first end of the first capacitor is respectively connected to the source of the first switching transistor and the input end of the flyback switching power supply circuit, and the source of the second switching transistor, the anode of the second zener diode and the second end of the first capacitor are grounded.

4. The flyback power supply device according to any one of claims 1 to 3, characterized in that The flyback switching power supply circuit includes: An RCD absorption module; A transformer, the primary coil wound around the magnetic core of the transformer is connected to the RCD absorption module; An output rectification module connected to the first secondary coil wound around the magnetic core of the transformer; A voltage feedback module respectively connected to the output end of the output rectification module and the second secondary coil wound around the magnetic core of the transformer; A sixth resistor and a seventh resistor, the first end of the sixth resistor is respectively connected to the voltage limiting circuit and the RCD absorption module, and the first end of the seventh resistor is grounded; Topswitch power chip, the drain pin of the switching transistor of the Topswitch power chip is connected to the second end of the sixth resistor, the undervoltage and overvoltage monitoring pin of the Topswitch power chip is connected to the RCD snubber module, the feedback control pin of the Topswitch power chip is connected to the voltage feedback module, the external current limiting control pin of the Topswitch power chip is connected to the second end of the seventh resistor, and the source pin and the frequency setting pin of the switching transistor of the Topswitch power chip are grounded.

5. The flyback power supply device according to claim 4, wherein The RCD snubber module includes an eighth resistor, a second capacitor and a first diode; The first end of the eighth resistor is respectively connected to the first end of the sixth resistor and the first end of the second capacitor, the second end of the eighth resistor is respectively connected to the second end of the second capacitor and the cathode of the first diode, the first end of the second capacitor and the anode of the first diode are connected to the primary coil, and the anode of the first diode is connected to the undervoltage and overvoltage monitoring pin of the Topswitch power chip.

6. The flyback power supply device according to claim 4, wherein The output rectification module includes a second diode and a third capacitor; The anode of the second diode and the first end of the third capacitor are connected to the first secondary coil, the cathode of the second diode is respectively connected to the second end of the third capacitor and the voltage feedback module, and the first end of the third capacitor is connected to the voltage feedback module.

7. The flyback power supply device according to claim 4, wherein, The voltage feedback module includes a third zener diode, a ninth resistor, an optocoupler, a third diode, a fourth capacitor and a fifth capacitor; The cathode of the third zener diode is connected to the positive output end of the output rectification module, the anode of the third zener diode is connected to the first end of the ninth resistor, the second end of the ninth resistor is connected to the anode of the optocoupler, and the cathode of the optocoupler is connected to the negative output end of the output rectification module; The anode of the third diode and the first end of the fourth capacitor are connected to the second secondary coil, the cathode of the third diode is respectively connected to the second end of the fourth capacitor and the emitter of the optocoupler, the collector of the optocoupler is respectively connected to the feedback control pin of the Topswitch power chip and the first end of the fifth capacitor, and the first end of the fourth capacitor and the second end of the fifth capacitor are grounded.

8. The flyback power supply device according to any one of claims 1 to 3, characterized in that, The rectification circuit includes a rectifier bridge and a sixth capacitor; The positive output end of the rectifier bridge is respectively connected to the first end of the sixth capacitor and the voltage limiting circuit, and the negative output end of the rectifier bridge and the second end of the sixth capacitor are grounded.

9. A energy storage converter system, characterized in that, The energy storage converter system includes an energy storage converter and a flyback power supply device according to any one of claims 1 to 8; the AC side of the energy storage converter is connected to the input end of the flyback power supply device.

10. A energy storage system, characterized in that, The energy storage system includes a photovoltaic module, a battery module, an energy storage converter, a power grid, a load and a flyback power supply device according to any one of claims 1 to 8; The DC side of the energy storage inverter is respectively connected to the photovoltaic module and the battery module, and the AC side of the energy storage inverter is respectively connected to the input end of the flyback power supply device, the power grid and the load.

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