Uninterruptible power supply topology architecture suitable for energy storage system

Abstract

The utility model discloses an uninterruptible power supply topology architecture suitable for an energy storage system, and relates to the technical field of energy storage systems. The framework comprises a first alternating current side input terminal used for being connected with an energy storage converter in the energy storage system, a second alternating current side input terminal used for being connected with an uninterruptible power supply, an alternating current switching circuit, a rectifying circuit, a direct current side input terminal used for being connected with a battery in the energy storage system, an under-voltage protection circuit and a direct current switching circuit, the power conversion and safety output circuit and the direct current side output terminal are connected, so that various electric energy sources can be compatible to provide stable and reliable direct current output to serve as a power supply of the whole energy storage system, the size of a product can be reduced, and the BOM cost and the manufacturing cost of the whole system can be remarkably reduced; and the difficulty of external wiring and the complexity of the system can be reduced, fault points of the system are reduced, the reliability of the system is improved, and practical application and popularization are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage systems, and specifically relates to an uninterruptible power supply topology architecture suitable for energy storage systems. Background Art

[0002] As the global energy transition progresses, the development and utilization of renewable energy is becoming increasingly widespread. Energy storage technology, as a key means of accommodating new energy, is becoming increasingly important. The energy storage market has enormous potential, particularly in the industrial and commercial sectors.

[0003] Industrial and commercial energy storage refers to the conversion of electrical energy into other forms of energy during commercial and industrial electricity consumption, stored through energy storage equipment for use in emergencies. The application of this technology not only improves the operational efficiency of power systems but also provides more flexible services for the electricity market. The stability and reliability of the system power supply in industrial and commercial energy storage systems are crucial, impacting their entire lifecycle. This means that the system power supply must be stable and reliable over the long term, from production commissioning to product delivery.

[0004] Currently, the mainstream system power supply solution on the market uses an AC / DC module to convert 220V AC power into 24V DC power to power the entire energy storage system. In actual energy storage system power supply solutions, the aforementioned 220V AC power can come from the energy storage system's energy storage inverter, a local uninterruptible power supply system, or by reducing the high-voltage DC power from the energy storage system's batteries to 24V DC power to power the entire energy storage system when the 220V AC power supply is interrupted. However, existing energy storage system power supply solutions lack the integration / compatibility technology to address these power sources, resulting in larger product sizes and higher overall system BOM (Bill of Material, referring to the costs directly related to hardware products, incurred for each finished product) and manufacturing costs. Utility Model Content

[0005] The purpose of this utility model is to provide an uninterruptible power supply topology architecture suitable for energy storage systems, so as to solve the problems of existing energy storage system power supply solutions resulting in large product size and high overall system BOM cost and manufacturing cost due to the lack of integration / compatibility technical means for multiple power sources.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, an uninterruptible power supply topology architecture suitable for an energy storage system is provided, comprising a first AC side input terminal, a second AC side input terminal, an AC switching circuit, a rectifier circuit, a DC side input terminal, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit, and a DC side output terminal, wherein the first AC side input terminal is used to connect to the AC output terminal of an energy storage converter in the energy storage system, the second AC side input terminal is used to connect to the AC output terminal of the uninterruptible power supply, and the DC side input terminal is used to connect to the DC output terminal of a battery in the energy storage system;

[0008] The two input terminals of the AC switching circuit are connected to the first AC side input terminal and the second AC side input terminal respectively, the output terminal of the AC switching circuit is connected to the input terminal of the rectifier circuit, and the input terminal of the undervoltage protection circuit is connected to the DC side input terminal;

[0009] The two input terminals of the DC switching circuit are respectively connected to the output terminal of the rectifier circuit and the output terminal of the undervoltage protection circuit in a one-to-one correspondence. The output terminal of the DC switching circuit is connected to the input terminal of the power conversion and safety output circuit. The output terminal of the power conversion and safety output circuit is connected to the DC side output terminal.

[0010] Based on the above-mentioned utility model content, a new power supply solution for an energy storage system is provided that can integrate / be compatible with multiple power sources for DC power supply, namely, it includes a first AC side input terminal for connecting to an energy storage converter in the energy storage system, a second AC side input terminal for connecting to an uninterruptible power supply, an AC switching circuit, a rectifier circuit, a DC side input terminal for connecting to a battery in the energy storage system, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit and a DC side output terminal. Through their connection relationship, it can be compatible with multiple power sources to provide stable and reliable DC output as the power supply for the entire energy storage system. This not only reduces the size of the product and significantly reduces the overall BOM cost and manufacturing cost of the system, but also reduces the difficulty of external wiring and the complexity of the system, reduces the system failure points, improves the reliability of the system, and facilitates practical application and promotion.

[0011] In one possible design, the AC switching circuit includes a first input terminal for connecting to the first AC side input terminal, a second input terminal for connecting to the second AC side input terminal, a first relay, and a first output terminal for connecting to an input terminal in the rectifier circuit;

[0012] The live wire connection end of the first input terminal is connected to the normally closed end of the first single-pole double-throw contact switch in the first relay, and the neutral wire connection end of the first input terminal is connected to the normally closed end of the second single-pole double-throw contact switch in the first relay;

[0013] The live wire connection end of the second input terminal is respectively connected to one end of the coil branch in the first relay and the normally open end of the first single-pole double-throw contact switch in the first relay, and the neutral wire connection end of the second input terminal is respectively connected to the other end of the coil branch in the first relay and the normally open end of the second single-pole double-throw contact switch in the first relay;

[0014] The common end of the first single-pole double-throw contact switch in the first relay is connected to the live wire connection end in the first output terminal, and the common end of the second single-pole double-throw contact switch in the first relay is connected to the neutral wire connection end in the first output terminal.

[0015] In one possible design, the rectifier circuit includes a third input terminal for connecting to an output terminal of the AC switching circuit, a first resistor, a second resistor, a first capacitor, a transformer, a second capacitor, a third capacitor, a fourth capacitor, a bridge rectifier, an electrolytic capacitor, and a second output terminal for connecting to an input terminal of the DC switching circuit, wherein the first resistor and the second resistor are connected in series to form a series resistor branch.

[0016] The live wire connection end of the third input terminal is respectively connected to one end of the series resistor branch, one end of the first capacitor, and the same-named end of the secondary winding of the transformer; the neutral wire connection end of the third input terminal is respectively connected to the other end of the series resistor branch, the other end of the first capacitor, and the same-named end of the primary winding of the transformer;

[0017] The opposite-name ends of the secondary winding of the transformer are respectively connected to one end of the second capacitor, one end of the fourth capacitor, and one input end of the bridge rectifier; the opposite-name ends of the primary winding of the transformer are respectively connected to one end of the third capacitor, the other end of the fourth capacitor, and the other input end of the bridge rectifier; the other end of the second capacitor and the other end of the third capacitor are respectively connected to ground wires;

[0018] The positive output end of the bridge rectifier is respectively connected to the anode of the electrolytic capacitor and the positive connection end of the second output terminal, and the negative output end of the bridge rectifier is respectively connected to the cathode of the electrolytic capacitor and the negative connection end of the second output terminal.

[0019] In one possible design, the rectifier circuit further includes a fuse, a negative temperature coefficient thermistor, and a varistor;

[0020] The live wire connection end of the third input terminal is connected in series with the fuse, and is respectively connected to one end of the series resistor branch, one end of the first capacitor, the same-name end of the secondary winding of the transformer, and one end of the varistor;

[0021] The neutral line connection end in the third input terminal is connected in series with the negative temperature coefficient thermistor and is then connected to the other end of the resistance series branch, the other end of the first capacitor, the same-name end of the primary winding of the transformer and the other end of the varistor.

[0022] In one possible design, the undervoltage protection circuit includes a fourth input terminal for connecting to the DC side input terminal, a differential sampling subcircuit, a hysteresis comparison subcircuit, an on / off control subcircuit, and a third output terminal for connecting to an input terminal in the DC switching circuit;

[0023] The positive and negative connection ends of the fourth input terminal are connected to the two input ends of the differential sampling sub-circuit respectively, the output end of the differential sampling sub-circuit is connected to the input end of the hysteresis comparison sub-circuit, the output end of the hysteresis comparison sub-circuit is connected to the input end of the on-off control sub-circuit, and the negative connection end of the fourth input terminal is connected to the negative connection end of the third output terminal;

[0024] The differential sampling subcircuit is used to collect and output the sampled voltage between the positive and negative connection terminals;

[0025] The hysteresis comparison subcircuit is used to compare the sampled voltage with a reference voltage and transmit the comparison result to the on-off control subcircuit;

[0026] The on-off control subcircuit is configured to connect the path between the positive connection end in the fourth input terminal and the positive connection end in the third output terminal when the sampling voltage is greater than or equal to the reference voltage, and disconnect the path between the positive connection end in the fourth input terminal and the positive connection end in the third output terminal when the sampling voltage is less than the reference voltage.

[0027] In one possible design, the differential sampling subcircuit includes a third resistor, a fourth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a ninth capacitor, an eighth resistor, a tenth capacitor, a first operational amplifier, a ninth resistor, an eleventh capacitor, and a tenth resistor;

[0028] One end of the third resistor is used as an input end of the differential sampling sub-circuit and is connected to the negative connection end of the fourth input terminal, the other end of the third resistor is respectively connected to one end of the sixth capacitor, one end of the seventh capacitor, and one end of the fifth resistor, and the other end of the sixth capacitor is grounded;

[0029] One end of the fourth resistor is used as the other input end of the differential sampling sub-circuit and is connected to the positive connection end of the fourth input terminal, the other end of the fourth resistor is respectively connected to one end of the eighth capacitor, the other end of the seventh capacitor, and one end of the sixth resistor, and the other end of the eighth capacitor is grounded;

[0030] The other end of the fifth resistor is respectively connected to one end of the seventh resistor, one end of the ninth capacitor, and the negative input terminal of the first operational amplifier; the other end of the sixth resistor is respectively connected to one end of the eighth resistor, one end of the tenth capacitor, and the positive input terminal of the first operational amplifier; the other end of the eighth resistor and the other end of the tenth capacitor are respectively grounded;

[0031] The other end of the seventh resistor, the other end of the ninth capacitor, and the output end of the first operational amplifier are respectively connected to one end of the ninth resistor. The other end of the ninth resistor is used as the output end of the differential sampling sub-circuit and is respectively connected to one end of the eleventh capacitor and one end of the tenth resistor. The other end of the eleventh capacitor and the other end of the tenth resistor are respectively grounded.

[0032] In one possible design, the hysteresis comparison sub-circuit includes a reference voltage DC power supply, an eleventh resistor, a twelfth resistor, a second operational amplifier, a thirteenth resistor, a fourteenth resistor, and a third operational amplifier;

[0033] One end of the eleventh resistor is connected to the reference voltage DC power supply, and the other end of the eleventh resistor is respectively connected to one end of the twelfth resistor and the positive input terminal of the second operational amplifier, and the negative input terminal of the second operational amplifier is used as the input terminal of the hysteresis comparator sub-circuit;

[0034] One end of the thirteenth resistor is connected to the reference voltage DC power supply, the other end of the thirteenth resistor is connected to the positive input terminal of the third operational amplifier, the output terminal of the second operational amplifier is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to the negative input terminal of the third operational amplifier, and the output terminal of the third operational amplifier is used as the output terminal of the hysteresis comparison sub-circuit.

[0035] In one possible design, the on-off control subcircuit includes a fifteenth resistor, a sixteenth resistor, a twelfth capacitor, a transistor, a seventeenth resistor, a first crystal diode, a second relay, a thirteenth capacitor, and a DC power supply;

[0036] One end of the fifteenth resistor is used as an input end of the on-off control subcircuit, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor, one end of the twelfth capacitor, and the base of the transistor, respectively, and the other end of the sixteenth resistor, the other end of the twelfth capacitor, and the emitter of the transistor are grounded respectively;

[0037] The collector of the transistor is connected to one end of the seventeenth resistor, the other end of the seventeenth resistor is respectively connected to the anode of the first crystal diode and one end of the coil branch in the second relay, the cathode of the first crystal diode, the other end of the coil branch in the second relay, and one end of the thirteenth capacitor are respectively connected to the DC power supply, and the other end of the thirteenth capacitor is grounded;

[0038] The normally closed end of the single-pole double-throw contact switch in the second relay is suspended, the normally open end of the single-pole double-throw contact switch in the second relay is used to connect the positive connection end of the fourth input terminal, and the common end of the single-pole double-throw contact switch in the second relay is used to connect the positive connection end of the third output terminal.

[0039] In one possible design, the DC switching circuit includes a fifth input terminal for connecting to an output terminal of the rectifier circuit, a sixth input terminal for connecting to an output terminal of the undervoltage protection circuit, a third relay, a second crystal diode, a third crystal diode, a fourth crystal diode, and a fourth output terminal for connecting to an input terminal of the power conversion and safety output circuit;

[0040] The positive connection end of the fifth input terminal is connected to the anode of the second crystal diode, the negative connection end of the fifth input terminal is connected to the anode of the third crystal diode, the cathode of the third crystal diode is connected to the negative connection end of the sixth input terminal, the positive connection end of the sixth input terminal is connected to the normally closed end of the single-pole double-throw contact switch in the third relay, the normally open end of the single-pole double-throw contact switch in the third relay is suspended, and the common end of the single-pole double-throw contact switch in the third relay is connected to the anode of the fourth crystal diode;

[0041] The cathode of the second crystal diode and the cathode of the fourth crystal diode are respectively connected to the positive connection end of the fourth output terminal;

[0042] The two ends of the coil branch in the third relay are respectively connected to the live wire connection end and the neutral wire connection end of the output terminal in the AC switching circuit in a one-to-one correspondence.

[0043] In one possible design, the DC side output terminal includes a first DC output terminal for connecting to the power supply terminal of the energy management unit in the energy storage system, a second DC output terminal for connecting to the power supply terminal of the battery management unit in the energy storage system, and / or a third DC output terminal for connecting to the power supply terminal of the fire-fighting power unit in the energy storage system.

[0044] Beneficial effects of the above scheme:

[0045] (1) The present invention creatively provides a new power supply solution for an energy storage system that can integrate / be compatible with multiple power sources for DC power supply, namely, it includes a first AC side input terminal for connecting to an energy storage converter in the energy storage system, a second AC side input terminal for connecting to an uninterruptible power supply, an AC switching circuit, a rectifier circuit, a DC side input terminal for connecting to a battery in the energy storage system, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit and a DC side output terminal. Through their connection relationship, it can be compatible with multiple power sources to provide a stable and reliable DC output as the power supply for the entire energy storage system. This not only reduces the size of the product and significantly reduces the overall BOM cost and manufacturing cost of the system, but also reduces the difficulty of external wiring and the complexity of the system, reduces the system failure points, improves the reliability of the system, and facilitates practical application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 A schematic diagram of an uninterruptible power supply topology architecture suitable for an energy storage system provided in an embodiment of the present application.

[0048] Figure 2 A schematic diagram of an AC switching circuit in an uninterruptible power supply topology provided in an embodiment of the present application.

[0049] Figure 3 A schematic diagram of a rectifier circuit in an uninterruptible power supply topology architecture provided in an embodiment of the present application.

[0050] Figure 4This is a schematic diagram of an undervoltage protection circuit in an uninterruptible power supply topology architecture provided in an embodiment of the present application.

[0051] Figure 5 A schematic diagram of a DC switching circuit in an uninterruptible power supply topology provided in an embodiment of the present application.

[0052] Figure 6 This is a schematic diagram of the power conversion and safety output circuit in the uninterruptible power supply topology architecture provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these embodiments without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0054] It should be understood that although the terms first, second, etc. may be used herein to describe various objects, these objects should not be limited by these terms. These terms are merely used to distinguish one object from another. For example, a first object can be referred to as a second object, and similarly, a second object can be referred to as a first object without departing from the scope of the exemplary embodiments of the present invention.

[0055] It should be understood that the term "and / or" that may appear in this document is merely a description of the association relationship between associated objects, indicating that there may be three relationships. For example, A and / or B can indicate three situations: A exists alone, B exists alone, or A and B exist at the same time. For another example, A, B and / or C can indicate the existence of any one of A, B and C or any combination of them. The term " / and" that may appear in this document describes another type of association object relationship, indicating that there may be two relationships. For example, A / and B can indicate two situations: A exists alone or A and B exist at the same time. In addition, the character " / " that may appear in this document generally indicates that the previous and next associated objects are in an "or" relationship.

[0056] Example

[0057] like Figures 1 to 6As shown, the uninterruptible power supply topology architecture provided in this embodiment and applicable to the energy storage system includes but is not limited to a first AC side input terminal, a second AC side input terminal, an AC switching circuit, a rectifier circuit, a DC side input terminal, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit, and a DC side output terminal, wherein the first AC side input terminal is used to connect to the AC output terminal of the energy storage converter in the energy storage system, the second AC side input terminal is used to connect to the AC output terminal of the uninterruptible power supply, and the DC side input terminal is used to connect to the DC output terminal of the battery in the energy storage system; The two input terminals of the AC switching circuit are respectively connected to the first AC side input terminal and the second AC side input terminal in a one-to-one correspondence, the output terminal of the AC switching circuit is connected to the input terminal of the rectifier circuit, and the input terminal of the undervoltage protection circuit is connected to the DC side input terminal; the two input terminals of the DC switching circuit are respectively connected to the output terminal of the rectifier circuit and the output terminal of the undervoltage protection circuit in a one-to-one correspondence, the output terminal of the DC switching circuit is connected to the input terminal of the power conversion and safety output circuit, and the output terminal of the power conversion and safety output circuit is connected to the DC side output terminal.

[0058] like Figure 1 As shown, in the specific structure of the uninterruptible power supply topology architecture, the first AC side input terminal is used to import AC220 AC power from the energy storage converter in the energy storage system, the second AC side input terminal is used to import AC220 AC power from the local uninterruptible power supply system, and the DC side input terminal is used to import high-voltage DC power (e.g., 1000V DC power) from the battery in the energy storage system. The AC power switching circuit is used to automatically select one of the AC power imported by the first AC side input terminal and the AC power imported by the second AC side input terminal (specifically, the AC220 AC power from the local uninterruptible power supply system can be preferentially selected) to feed into the rectifier circuit. The rectifier circuit is used to convert the selected AC power into DC power. The undervoltage protection circuit is used to simultaneously provide undervoltage protection for the battery in the energy storage system while importing the high-voltage DC power, that is, automatically stop importing the high-voltage DC power if it is found to be undervoltage. The DC switching circuit is used to automatically select one of the DC output by the rectifier circuit and the DC output by the undervoltage protection circuit (specifically, the DC output by the rectifier circuit can be preferentially selected) to feed into the power conversion and safety output circuit. The power conversion and safety output circuit is used to convert the selected DC into DC suitable for output and with reduced power (for example, DC24V DC) and output it safely, which specifically but not limited to adopt the following methods: Figure 6The circuit structure shown is conventionally implemented (including a current limiting protection structure, an overvoltage protection structure, and an undervoltage protection structure, etc., which can automatically shut down the power conversion circuit part to stop external output when the DC24V direct current has overcurrent, overvoltage and / or undervoltage phenomena). The DC side output terminal is used to introduce direct current into the energy storage system to achieve the power supply purpose. Specifically, the DC side output terminal includes but is not limited to a first DC output terminal (i.e., a power supply terminal for connecting to the energy management unit in the energy storage system) Figure 1 DC 24V-1), a second DC output terminal for connecting the power supply terminal of the battery management unit in the energy storage system (i.e. Figure 1 DC 24V-2) and / or a third DC output terminal (i.e., a power supply terminal for connecting a fire-fighting power unit in the energy storage system) Figure 1 DC 24V-3) etc.

[0059] Based on the detailed description of the aforementioned uninterruptible power supply topology architecture, a new energy storage system power supply solution is provided that can integrate / be compatible with multiple power sources for DC power supply, namely, it includes a first AC side input terminal for connecting to the energy storage converter in the energy storage system, a second AC side input terminal for connecting to the uninterruptible power supply, an AC switching circuit, a rectifier circuit, a DC side input terminal for connecting to the battery in the energy storage system, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit and a DC side output terminal. Through their connection relationship, it can be compatible with multiple power sources to provide stable and reliable DC output as the power supply for the entire energy storage system. This not only reduces the size of the product and significantly reduces the overall BOM cost and manufacturing cost of the system, but also reduces the difficulty of external wiring and the complexity of the system, reduces the system failure points, improves the reliability of the system, and facilitates practical application and promotion.

[0060] Preferably, the AC switching circuit includes but is not limited to a first input terminal for connecting to the first AC side input terminal, a second input terminal for connecting to the second AC side input terminal, a first relay K1, and a first output terminal for connecting to the input terminal in the rectifier circuit; the live wire connection terminal L1 of the first input terminal is connected to the normally closed terminal of the first single-pole double-throw contact switch in the first relay K1, and the neutral wire connection terminal N1 of the first input terminal is connected to the normally closed terminal of the second single-pole double-throw contact switch in the first relay K1; the live wire connection terminal L2 of the second input terminal is connected to the normally closed terminal of the second single-pole double-throw contact switch in the first relay K1; The first input terminal is connected to one end of the coil branch in the first relay K1 and the normally open end of the first single-pole double-throw contact switch in the first relay K1. The neutral line connection end N2 in the second input terminal is connected to the other end of the coil branch in the first relay K1 and the normally open end of the second single-pole double-throw contact switch in the first relay K1. The common end of the first single-pole double-throw contact switch in the first relay K1 is connected to the live wire connection end LO1 in the first output terminal, and the common end of the second single-pole double-throw contact switch in the first relay K1 is connected to the neutral line connection end NO1 in the first output terminal. Figure 2 As shown, the following operating principle can be achieved: when only AC power is input from the first AC-side input terminal, the first relay K1 does not operate and directly outputs the AC power. However, when only AC power is input from the second AC-side input terminal, or when both AC power and AC power are input from the second AC-side input terminal, the first relay K1 operates to output the AC power input from the second AC-side input terminal. This allows automatic selection of either the AC power input from the first AC-side input terminal or the AC power input from the second AC-side input terminal (specifically, AC220 power from the local uninterruptible power supply system can be preferentially selected).

[0061] Preferably, the rectifier circuit includes but is not limited to a third input terminal for connecting to the output terminal of the AC switching circuit, a first resistor R1, a second resistor R2, a first capacitor C1, a transformer LP1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a bridge rectifier BD1, an electrolytic capacitor C5 and a second output terminal for connecting to the input terminal of the DC switching circuit, wherein the first resistor R1 and the second resistor R2 are connected in series to form a resistor series branch; the live wire connection end L3 in the third input terminal is respectively connected to one end of the resistor series branch, one end of the first capacitor C1 and the same-name end of the secondary winding of the transformer LP1, and the neutral wire connection end N3 in the third input terminal is respectively connected to the other end of the resistor series branch, the other end of the first capacitor C1 and The primary winding of the transformer LP1 has the same-name end; the secondary winding of the transformer LP1 has the opposite-name end connected to one end of the second capacitor C2, one end of the fourth capacitor C4 and one input end of the bridge rectifier BD1 respectively; the primary winding of the transformer LP1 has the opposite-name end connected to one end of the third capacitor C3, the other end of the fourth capacitor C4 and the other input end of the bridge rectifier BD1 respectively; the other end of the second capacitor C2 and the other end of the third capacitor C3 are connected to the ground wire PE respectively; the positive output end of the bridge rectifier BD1 is connected to the anode of the electrolytic capacitor C5 and the positive connection end DCO+ in the second output terminal respectively; the negative output end of the bridge rectifier BD1 is connected to the cathode of the electrolytic capacitor C5 and the negative connection end DCO- in the second output terminal respectively. Figure 3 As shown, the purpose of converting the selected AC power into DC power can be achieved. In addition, in order to achieve the purposes of overcurrent protection, voltage detection, and temperature detection, it is further preferred that the rectifier circuit further includes but is not limited to a fuse F1, a negative temperature coefficient thermistor NTC, and a varistor VR1; the live wire connection end L3 of the third input terminal is connected in series with the fuse F1 and is respectively connected to one end of the series resistor branch, one end of the first capacitor C1, the same-name end of the secondary winding of the transformer LP1, and one end of the varistor VR1; the neutral wire connection end N3 of the third input terminal is connected in series with the negative temperature coefficient thermistor NTC and is respectively connected to the other end of the series resistor branch, the other end of the first capacitor C1, the same-name end of the primary winding of the transformer LP1, and the other end of the varistor VR1.

[0062] Preferably, the undervoltage protection circuit includes but is not limited to a fourth input terminal for connecting to the DC side input terminal, a differential sampling sub-circuit, a hysteresis comparison sub-circuit, an on-off control sub-circuit, and a third output terminal for connecting to the input terminal of the DC switching circuit; the positive and negative connection terminals (DC1000V+, DC1000V-) of the fourth input terminal are respectively connected to the two input terminals of the differential sampling sub-circuit in a one-to-one correspondence, the output terminal of the differential sampling sub-circuit is connected to the input terminal of the hysteresis comparison sub-circuit, the output terminal of the hysteresis comparison sub-circuit is connected to the input terminal of the on-off control sub-circuit, the negative connection terminal DC1000V- of the fourth input terminal is connected to the negative connection terminal of the third output terminal; the differential sampling sub-circuit a circuit for collecting and outputting a sampled voltage between the positive and negative connection terminals (DC1000V+, DC1000V-); a hysteresis comparison subcircuit for comparing the sampled voltage with a reference voltage and transmitting the comparison result to the on-off control subcircuit; and a on-off control subcircuit for conducting a path between the positive connection terminal DC1000V+ in the fourth input terminal and the positive connection terminal DCO1000+ in the third output terminal when the sampled voltage is greater than or equal to the reference voltage, and for disconnecting the path between the positive connection terminal DC1000V+ in the fourth input terminal and the positive connection terminal DCO1000+ in the third output terminal when the sampled voltage is less than the reference voltage.

[0063] Specifically, the differential sampling subcircuit includes but is not limited to a third resistor R3, a fourth resistor R4, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth capacitor C9, an eighth resistor R8, a tenth capacitor C10, a first operational amplifier U1B, a ninth resistor R9, an eleventh capacitor C11, and a tenth resistor R4; one end of the third resistor R3 is used as an input end of the differential sampling subcircuit and connected to the negative connection end DC1000V- of the fourth input terminal, the other end of the third resistor R3 is respectively connected to one end of the sixth capacitor C6, one end of the seventh capacitor C7, and one end of the fifth resistor R5, and the other end of the sixth capacitor C6 is grounded; one end of the fourth resistor R4 is used as another input end of the differential sampling subcircuit and connected to the positive connection end DC1000V+ of the fourth input terminal, and the other end of the fourth resistor R4 is respectively connected to one end of the eighth capacitor C8 , the other end of the seventh capacitor C7 and one end of the sixth resistor R6, and the other end of the eighth capacitor C8 are grounded; the other end of the fifth resistor R5 is respectively connected to one end of the seventh resistor R7, one end of the ninth capacitor C9 and the negative input end of the first operational amplifier U1B, the other end of the sixth resistor R6 is respectively connected to one end of the eighth resistor R8, one end of the tenth capacitor C10 and the positive input end of the first operational amplifier U1B, and the other end of the eighth resistor R8 and the other end of the tenth capacitor C10 are respectively grounded; the other end of the seventh resistor R7, the other end of the ninth capacitor C9 and the output end of the first operational amplifier U1B are respectively connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is used as the output end of the differential sampling sub-circuit and is respectively connected to one end of the eleventh capacitor C11 and one end of the tenth resistor R4, and the other end of the eleventh capacitor C11 and the other end of the tenth resistor R4 are respectively grounded. Figure 4 As shown, the sampling voltage (It can be seen that this sampling voltage is linearly positively correlated with the voltage of the battery in the energy storage system), where V bat represents the voltage of the battery in the energy storage system, R3 represents the resistance of the third resistor R3, R5 represents the resistance of the fifth resistor R5, and R7 represents the resistance of the seventh resistor R7. In this way, the purpose of collecting and outputting the sampled voltage between the positive and negative connection terminals (DC1000V+, DC1000V-) can be achieved.

[0064] Specifically, the hysteresis comparison sub-circuit includes but is not limited to a reference voltage DC power supply VDD, an eleventh resistor R11, a twelfth resistor R12, a second operational amplifier U1C, a thirteenth resistor R13, a fourteenth resistor R14 and a third operational amplifier U1D; one end of the eleventh resistor R11 is connected to the reference voltage DC power supply VDD, the other end of the eleventh resistor R11 is respectively connected to one end of the twelfth resistor R12 and the positive input end of the second operational amplifier U1C, and the negative input end of the second operational amplifier U1C is used as the input end of the hysteresis comparison sub-circuit; one end of the thirteenth resistor R13 is connected to the reference voltage DC power supply VDD, the other end of the thirteenth resistor R13 is connected to the positive input end of the third operational amplifier U1D, the output end of the second operational amplifier U1C is connected to one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to the negative input end of the third operational amplifier U1D, and the output end of the third operational amplifier U1D is used as the output end of the hysteresis comparison sub-circuit. Figure 4 As shown, the voltage provided by the aforementioned reference voltage DC power supply VDD can be, but is not limited to, 2.5V, and the reference voltage is V2. When V1 is greater than V2 in a high level state, Figure 4 V3 in is low level (at this time Figure 4 When V4 is high level, and V1 is lower than V2 which is low level, Figure 4 V3 in is high level (at this time Figure 4 In this way, the sampled voltage can be compared with the reference voltage.

[0065] Specifically, the on-off control subcircuit includes but is not limited to a fifteenth resistor R15, a sixteenth resistor R16, a twelfth capacitor C12, a transistor Q1, a seventeenth resistor R17, a first crystal diode D1, a second relay K2, a thirteenth capacitor C13 and a DC power supply VCC (for example, providing 24V DC power); one end of the fifteenth resistor R15 is used as the input end of the on-off control subcircuit, and the other end of the fifteenth resistor R15 is respectively connected to one end of the sixteenth resistor R16, one end of the twelfth capacitor C12 and the base of the transistor Q1, and the other end of the sixteenth resistor R16, the other end of the twelfth capacitor C12 and the emitter of the transistor Q1 are respectively grounded; the collector of the transistor Q1 is connected to the seventeenth resistor R16. One end of R17 and the other end of the seventeenth resistor R17 are respectively connected to the anode of the first crystal diode D1 and one end of the coil branch in the second relay K2, the cathode of the first crystal diode D1, the other end of the coil branch in the second relay K2 and one end of the thirteenth capacitor C13 are respectively connected to the DC power supply VCC, and the other end of the thirteenth capacitor C13 is grounded; the normally closed end of the single-pole double-throw contact switch in the second relay K2 is suspended, the normally open end of the single-pole double-throw contact switch in the second relay K2 is used to connect to the positive connection end DC1000V+ in the fourth input terminal, and the common end of the single-pole double-throw contact switch in the second relay K2 is used to connect to the positive connection end DCO1000+ in the third output terminal. Figure 4 As shown, it can be Figure 4 When V3 in is low and V4 is high, the second relay K2 is actuated to conduct the path between the positive connection terminal DC1000V+ in the fourth input terminal and the positive connection terminal DCO1000+ in the third output terminal. Figure 4 When V3 in the circuit is at a high level and V4 is at a low level, the second relay K2 is inoperative to disconnect the path between the positive connection terminal DC1000V+ in the fourth input terminal and the positive connection terminal DCO1000+ in the third output terminal, thereby achieving the purpose of undervoltage protection of the battery in the energy storage system while introducing high-voltage direct current (i.e., automatically stopping the introduction of high-voltage direct current when undervoltage is detected).

[0066] Preferably, the DC switching circuit includes but is not limited to a fifth input terminal for connecting to the output terminal of the rectifier circuit, a sixth input terminal for connecting to the output terminal of the undervoltage protection circuit, a third relay K3, a second crystal diode D2, a third crystal diode D3, a fourth crystal diode D4, and a fourth output terminal for connecting to the input terminal of the power conversion and safety output circuit; the positive connection terminal DC+ of the fifth input terminal is connected to the anode of the second crystal diode D2, the negative connection terminal DC- of the fifth input terminal is connected to the anode of the third crystal diode D3, and the cathode of the third crystal diode D3 is connected to the cathode of the sixth input terminal. The negative connection terminal DC1000-, the positive connection terminal DC1000+ in the sixth input terminal is connected to the normally closed end of the single-pole double-throw contact switch in the third relay K3, the normally open end of the single-pole double-throw contact switch in the third relay K3 is suspended, and the common end of the single-pole double-throw contact switch in the third relay K3 is connected to the anode of the fourth crystal diode D4; the cathode of the second crystal diode D2 and the cathode of the fourth crystal diode D4 are respectively connected to the positive connection terminal DC_IN in the fourth output terminal; the two ends of the coil branch in the third relay K3 are respectively connected to the live wire connection terminal and the neutral wire connection terminal of the output terminal in the AC switching circuit. Figure 5 As shown, the following operating principle can be achieved: when only the DC power outputted by the rectifier circuit is output, or when both the DC power outputted by the rectifier circuit and the DC power outputted by the undervoltage protection circuit are outputted, the third relay K3 operates to output the DC power outputted by the rectifier circuit; whereas, when only the DC power outputted by the undervoltage protection circuit is outputted, the third relay K1 does not operate and directly outputs the DC power outputted by the undervoltage protection circuit. This achieves the purpose of automatically selecting between the DC power outputted by the rectifier circuit and the DC power outputted by the undervoltage protection circuit (specifically, the DC power outputted by the rectifier circuit can be preferentially selected).

[0067] In summary, the uninterruptible power supply topology architecture provided by this embodiment has the following technical effects:

[0068] (1) This embodiment provides a new power supply solution for an energy storage system that can integrate / be compatible with multiple power sources for DC power supply, namely, it includes a first AC side input terminal for connecting to an energy storage converter in the energy storage system, a second AC side input terminal for connecting to an uninterruptible power supply, an AC switching circuit, a rectifier circuit, a DC side input terminal for connecting to a battery in the energy storage system, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit and a DC side output terminal. Through their connection relationship, it can be compatible with multiple power sources to provide a stable and reliable DC output as the power supply for the entire energy storage system. This not only reduces the size of the product and significantly reduces the overall BOM cost and manufacturing cost of the system, but also reduces the difficulty of external wiring and the complexity of the system, reduces the system failure points, improves the reliability of the system, and facilitates practical application and promotion.

[0069] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An uninterruptible power supply topology architecture suitable for an energy storage system, characterized in that: The device comprises a first AC side input terminal, a second AC side input terminal, an AC switching circuit, a rectifier circuit, a DC side input terminal, an undervoltage protection circuit, a DC switching circuit, a power conversion and safety output circuit, and a DC side output terminal, wherein the first AC side input terminal is used to connect to the AC output terminal of the energy storage converter in the energy storage system, the second AC side input terminal is used to connect to the AC output terminal of the uninterruptible power supply, and the DC side input terminal is used to connect to the DC output terminal of the battery in the energy storage system; The two input terminals of the AC switching circuit are connected to the first AC side input terminal and the second AC side input terminal respectively, the output terminal of the AC switching circuit is connected to the input terminal of the rectifier circuit, and the input terminal of the undervoltage protection circuit is connected to the DC side input terminal; The two input terminals of the DC switching circuit are respectively connected to the output terminal of the rectifier circuit and the output terminal of the undervoltage protection circuit in a one-to-one correspondence. The output terminal of the DC switching circuit is connected to the input terminal of the power conversion and safety output circuit. The output terminal of the power conversion and safety output circuit is connected to the DC side output terminal.

2. The uninterruptible power supply topology architecture according to claim 1, wherein: The AC switching circuit includes a first input terminal for connecting to the first AC side input terminal, a second input terminal for connecting to the second AC side input terminal, a first relay (K1), and a first output terminal for connecting to the input terminal of the rectifier circuit; The live wire connection end (L1) in the first input terminal is connected to the normally closed end of the first single-pole double-throw contact switch in the first relay (K1), and the neutral wire connection end (N1) in the first input terminal is connected to the normally closed end of the second single-pole double-throw contact switch in the first relay (K1); The live wire connection end (L2) in the second input terminal is respectively connected to one end of the coil branch in the first relay (K1) and the normally open end of the first single-pole double-throw contact switch in the first relay (K1), and the neutral wire connection end (N2) in the second input terminal is respectively connected to the other end of the coil branch in the first relay (K1) and the normally open end of the second single-pole double-throw contact switch in the first relay (K1); The common end of the first single-pole double-throw contact switch in the first relay (K1) is connected to the live wire connection end (LO1) in the first output terminal, and the common end of the second single-pole double-throw contact switch in the first relay (K1) is connected to the neutral wire connection end (NO1) in the first output terminal.

3. The uninterruptible power supply topology architecture according to claim 1, wherein: The rectifier circuit includes a third input terminal for connecting to an output terminal of the AC switching circuit, a first resistor (R1), a second resistor (R2), a first capacitor (C1), a transformer (LP1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a bridge rectifier (BD1), an electrolytic capacitor (C5), and a second output terminal for connecting to an input terminal of the DC switching circuit, wherein the first resistor (R1) and the second resistor (R2) are connected in series to form a resistor series branch; The live wire connection end (L3) in the third input terminal is respectively connected to one end of the series resistor branch, one end of the first capacitor (C1) and the same-name end of the secondary winding of the transformer (LP1), and the neutral wire connection end (N3) in the third input terminal is respectively connected to the other end of the series resistor branch, the other end of the first capacitor (C1) and the same-name end of the primary winding of the transformer (LP1); The opposite-name ends of the secondary winding of the transformer (LP1) are respectively connected to one end of the second capacitor (C2), one end of the fourth capacitor (C4) and one input end of the bridge rectifier (BD1); the opposite-name ends of the primary winding of the transformer (LP1) are respectively connected to one end of the third capacitor (C3), the other end of the fourth capacitor (C4) and the other input end of the bridge rectifier (BD1); the other end of the second capacitor (C2) and the other end of the third capacitor (C3) are respectively connected to a ground wire (PE); The positive output end of the bridge rectifier (BD1) is respectively connected to the anode of the electrolytic capacitor (C5) and the positive connection end (DCO+) of the second output terminal, and the negative output end of the bridge rectifier (BD1) is respectively connected to the cathode of the electrolytic capacitor (C5) and the negative connection end (DCO-) of the second output terminal.

4. The uninterruptible power supply topology architecture according to claim 3, wherein: The rectifier circuit also includes a fuse (F1), a negative temperature coefficient thermistor (NTC) and a varistor (VR1); The live wire connection end (L3) in the third input terminal is connected in series with the fuse (F1) and is respectively connected to one end of the series resistor branch, one end of the first capacitor (C1), the same-name end of the secondary winding of the transformer (LP1), and one end of the varistor (VR1); After being connected in series with the negative temperature coefficient thermistor (NTC), the neutral line connection end (N3) in the third input terminal is respectively connected to the other end of the series resistor branch, the other end of the first capacitor (C1), the same-name end of the primary winding of the transformer (LP1), and the other end of the varistor (VR1).

5. The uninterruptible power supply topology architecture according to claim 1, wherein: The undervoltage protection circuit includes a fourth input terminal for connecting to the DC side input terminal, a differential sampling subcircuit, a hysteresis comparison subcircuit, an on-off control subcircuit and a third output terminal for connecting to the input terminal of the DC switching circuit; The positive and negative connection terminals (DC1000V+, DC1000V-) of the fourth input terminal are connected to the two input terminals of the differential sampling sub-circuit respectively, the output terminal of the differential sampling sub-circuit is connected to the input terminal of the hysteresis comparison sub-circuit, the output terminal of the hysteresis comparison sub-circuit is connected to the input terminal of the on-off control sub-circuit, and the negative connection terminal (DC1000V-) of the fourth input terminal is connected to the negative connection terminal of the third output terminal; The differential sampling subcircuit is used to collect and output the sampled voltage between the positive and negative connection terminals (DC1000V+, DC1000V-); The hysteresis comparison subcircuit is used to compare the sampled voltage with a reference voltage and transmit the comparison result to the on-off control subcircuit; The on-off control subcircuit is configured to connect the path between the positive connection terminal (DC1000V+) of the fourth input terminal and the positive connection terminal (DCO1000+) of the third output terminal when the sampled voltage is greater than or equal to the reference voltage, and disconnect the path between the positive connection terminal (DC1000V+) of the fourth input terminal and the positive connection terminal (DCO1000+) of the third output terminal when the sampled voltage is less than the reference voltage.

6. The uninterruptible power supply topology architecture according to claim 5, wherein: The differential sampling subcircuit includes a third resistor (R3), a fourth resistor (R4), a sixth capacitor (C6), a seventh capacitor (C7), an eighth capacitor (C8), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a ninth capacitor (C9), an eighth resistor (R8), a tenth capacitor (C10), a first operational amplifier (U1B), a ninth resistor (R9), an eleventh capacitor (C11) and a tenth resistor (R4); One end of the third resistor (R3) is used as an input end of the differential sampling sub-circuit and is connected to the negative connection end (DC1000V-) of the fourth input terminal, the other end of the third resistor (R3) is respectively connected to one end of the sixth capacitor (C6), one end of the seventh capacitor (C7) and one end of the fifth resistor (R5), and the other end of the sixth capacitor (C6) is grounded; One end of the fourth resistor (R4) is used as the other input end of the differential sampling sub-circuit and connected to the positive connection end (DC1000V+) of the fourth input terminal, the other end of the fourth resistor (R4) is respectively connected to one end of the eighth capacitor (C8), the other end of the seventh capacitor (C7) and one end of the sixth resistor (R6), and the other end of the eighth capacitor (C8) is grounded; The other end of the fifth resistor (R5) is respectively connected to one end of the seventh resistor (R7), one end of the ninth capacitor (C9) and the negative input terminal of the first operational amplifier (U1B); the other end of the sixth resistor (R6) is respectively connected to one end of the eighth resistor (R8), one end of the tenth capacitor (C10) and the positive input terminal of the first operational amplifier (U1B); the other end of the eighth resistor (R8) and the other end of the tenth capacitor (C10) are respectively grounded; The other end of the seventh resistor (R7), the other end of the ninth capacitor (C9) and the output end of the first operational amplifier (U1B) are respectively connected to one end of the ninth resistor (R9); the other end of the ninth resistor (R9) is used as the output end of the differential sampling sub-circuit and is respectively connected to one end of the eleventh capacitor (C11) and one end of the tenth resistor (R4); the other end of the eleventh capacitor (C11) and the other end of the tenth resistor (R4) are respectively grounded.

7. The uninterruptible power supply topology architecture according to claim 5, wherein: The hysteresis comparison subcircuit includes a reference voltage DC power supply (VDD), an eleventh resistor (R11), a twelfth resistor (R12), a second operational amplifier (U1C), a thirteenth resistor (R13), a fourteenth resistor (R14) and a third operational amplifier (U1D); One end of the eleventh resistor (R11) is connected to the reference voltage DC power supply (VDD), and the other end of the eleventh resistor (R11) is respectively connected to one end of the twelfth resistor (R12) and the positive input end of the second operational amplifier (U1C), and the negative input end of the second operational amplifier (U1C) is used as the input end of the hysteresis comparison sub-circuit; One end of the thirteenth resistor (R13) is connected to the reference voltage DC power supply (VDD), the other end of the thirteenth resistor (R13) is connected to the positive input terminal of the third operational amplifier (U1D), the output terminal of the second operational amplifier (U1C) is connected to one end of the fourteenth resistor (R14), the other end of the fourteenth resistor (R14) is connected to the negative input terminal of the third operational amplifier (U1D), and the output terminal of the third operational amplifier (U1D) is used as the output terminal of the hysteresis comparison sub-circuit.

8. The uninterruptible power supply topology architecture according to claim 5, wherein: The on-off control subcircuit includes a fifteenth resistor (R15), a sixteenth resistor (R16), a twelfth capacitor (C12), a transistor (Q1), a seventeenth resistor (R17), a first crystal diode (D1), a second relay (K2), a thirteenth capacitor (C13) and a DC power supply (VCC); One end of the fifteenth resistor (R15) is used as an input end of the on-off control subcircuit, the other end of the fifteenth resistor (R15) is respectively connected to one end of the sixteenth resistor (R16), one end of the twelfth capacitor (C12) and the base of the transistor (Q1), and the other end of the sixteenth resistor (R16), the other end of the twelfth capacitor (C12) and the emitter of the transistor (Q1) are respectively grounded; The collector of the transistor (Q1) is connected to one end of the seventeenth resistor (R17), the other end of the seventeenth resistor (R17) is respectively connected to the anode of the first crystal diode (D1) and one end of the coil branch in the second relay (K2), the cathode of the first crystal diode (D1), the other end of the coil branch in the second relay (K2) and one end of the thirteenth capacitor (C13) are respectively connected to the DC power supply (VCC), and the other end of the thirteenth capacitor (C13) is grounded; The normally closed end of the single-pole double-throw contact switch in the second relay (K2) is suspended, the normally open end of the single-pole double-throw contact switch in the second relay (K2) is used to connect the positive connection end (DC1000V+) of the fourth input terminal, and the common end of the single-pole double-throw contact switch in the second relay (K2) is used to connect the positive connection end (DCO1000+) of the third output terminal.

9. The uninterruptible power supply topology architecture according to claim 1, wherein: The DC switching circuit includes a fifth input terminal for connecting to an output terminal of the rectifier circuit, a sixth input terminal for connecting to an output terminal of the undervoltage protection circuit, a third relay (K3), a second crystal diode (D2), a third crystal diode (D3), a fourth crystal diode (D4), and a fourth output terminal for connecting to an input terminal of the power conversion and safety output circuit; The positive connection end (DC+) of the fifth input terminal is connected to the anode of the second crystal diode (D2), the negative connection end (DC-) of the fifth input terminal is connected to the anode of the third crystal diode (D3), the cathode of the third crystal diode (D3) is connected to the negative connection end (DC1000-) of the sixth input terminal, the positive connection end (DC1000+) of the sixth input terminal is connected to the normally closed end of the single-pole double-throw contact switch in the third relay (K3), the normally open end of the single-pole double-throw contact switch in the third relay (K3) is suspended, and the common end of the single-pole double-throw contact switch in the third relay (K3) is connected to the anode of the fourth crystal diode (D4); The cathode of the second crystal diode (D2) and the cathode of the fourth crystal diode (D4) are respectively connected to the positive connection end (DC_IN) of the fourth output terminal; The two ends of the coil branch in the third relay (K3) are respectively connected to the live wire connection end and the neutral wire connection end of the output terminal in the AC switching circuit in a one-to-one correspondence.

10. The uninterruptible power supply topology architecture according to claim 1, wherein: The DC side output terminal includes a first DC output terminal for connecting to the power supply terminal of the energy management unit in the energy storage system, a second DC output terminal for connecting to the power supply terminal of the battery management unit in the energy storage system, and / or a third DC output terminal for connecting to the power supply terminal of the fire-fighting power unit in the energy storage system.

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