Dual power interface board, device and system

Abstract

The utility model relates to energy storage system power supply and distribution technical field especially, relate to a kind of double power interface board, device and system.A kind of double power interface board, comprising: first DC input, for receiving first conversion voltage V1;Second DC input, for receiving second conversion voltage V2;Converging output node, for providing DC output voltage Vo to external load;First unidirectional conducting element, anode connects first DC input, cathode connects converging output node;Second unidirectional conducting element, cathode connects second DC input, cathode connects converging output node;The rated voltage of the first conversion voltage V1 is higher than the rated voltage of the second conversion voltage V2.This scheme is integrated double power converging in the same interface board, and the uninterrupted, monitorable, safe power supply of key control unit is realized with low cost, small size, solves the problem that UPS is large in size, high in cost and unreliable in switching in prior art.

Description

Technical Field

[0001] This utility model relates to the field of power supply and distribution technology for energy storage systems, and in particular to a dual power interface board, device and system. Background Technology

[0002] With the large-scale deployment of industrial and commercial energy storage and power plant-type energy storage, the DC control loops of EMS, BMS, and fire-fighting devices within the energy storage cabinet must maintain continuous power supply under all circumstances to complete fault monitoring, data recording, and fire-fighting linkage. Currently, there are two main common practices:

[0003] 1. Single auxiliary power supply scheme: Only 24V DC bus is obtained from AC mains power through AC / DC module. Once the mains power fails or the AC fuse blows, the control circuit immediately loses power, and the battery cluster cannot be monitored and protected in real time.

[0004] 2. External UPS solution: Power is supplied to the control circuit through an external UPS. Although it can provide backup power when the mains power is interrupted, the UPS is large, expensive, and complex to maintain. Moreover, it is separate from the energy storage system, resulting in cumbersome wiring and low space utilization.

[0005] Under the two schemes mentioned above, large space occupation, high cost, and insufficient power supply reliability have become prominent problems limiting the safety of energy storage systems. Utility Model Content

[0006] The purpose of this utility model is to provide a dual power interface board, device and system to address the shortcomings of the existing technology. It aims to provide an auxiliary power solution that is simple in structure, cost-controllable, can automatically and seamlessly switch to backup power when the main power is abnormal, and has overload protection and undervoltage alarm functions within a limited space, thereby ensuring uninterrupted power supply to the key control units of the energy storage system.

[0007] This utility model achieves the above objectives through the following technical solution: a dual power interface board, comprising:

[0008] The first DC input terminal is used to receive the first converted voltage V1;

[0009] The second DC input terminal is used to receive the second converted voltage V2;

[0010] The bus output node is used to provide DC output voltage Vo to an external load;

[0011] The first unidirectional conducting element has its positive terminal connected to the first DC input terminal and its negative terminal connected to the bus output node.

[0012] The second unidirectional conducting element has its negative terminal connected to the second DC input terminal and its negative terminal connected to the bus output node.

[0013] The rated voltage of the first conversion voltage V1 is higher than the rated voltage of the second conversion voltage V2. This higher rated voltage ensures that, under normal circumstances, the first conversion voltage V1 takes precedence. However, if the system experiences a power outage or malfunction, causing the first conversion voltage V1 to fall below the second conversion voltage V2, the second conversion voltage V2 will automatically maintain power supply to the external load.

[0014] As a further aspect of this utility model, it also includes:

[0015] The first power input terminal is used to receive the first input power.

[0016] The second power input terminal is used to receive the second input power.

[0017] The first conversion module is connected between the first power input terminal and the first DC input terminal, and is used to convert the first input power into the first conversion voltage V1;

[0018] The second conversion module is connected between the second power input terminal and the second DC input terminal, and is used to convert the second input power supply into the second conversion voltage V2.

[0019] As a further aspect of this utility model, it also includes:

[0020] The AC load terminal is connected to the first power input terminal and is connected in parallel with the input terminal of the first conversion module to provide AC output voltage Vb to the external load.

[0021] As a further aspect of this utility model, it also includes:

[0022] The protection unit is connected between the first power input terminal and the first DC input terminal, and is used to cut off the input of the first transformed voltage in case of overload or short circuit.

[0023] The undervoltage detection unit is connected to the first DC input terminal and the second DC input terminal respectively, and is used to receive the first conversion voltage V1 and the second conversion voltage V2. When either the first conversion voltage V1 or the second conversion voltage V2 is lower than a set threshold, a fault alarm signal is output.

[0024] As a further aspect of this utility model: both the first transformation voltage V1 and the second transformation voltage V2 are DC voltages;

[0025] The first power input terminal is an AC input terminal, the first input power supply is an AC input power supply, and the first conversion module is an isolated AC / DC module;

[0026] The second power input terminal is a DC high voltage input terminal, the second input power supply is a DC input power supply, and the second conversion module is an isolated DC / DC module;

[0027] The first unidirectional conducting element is diode D1, and the second unidirectional conducting element is diode D2;

[0028] The fault alarm signal is a digital I / O level signal;

[0029] The protection unit is a fuse or a thermal circuit breaker. In detail:

[0030] 1) Under normal conditions, the high-voltage side V1 is powered via the forward conduction of the diode; 2) When V1 drops below V2 (mains power failure), the diode containing V1 is reverse biased and cut off, while the diode containing V2 is forward conduction, instantly switching to the backup circuit to ensure uninterrupted power supply to the output Vo. This solves the problem of "control circuit power failure due to mains power failure".

[0031] II. 1) Simultaneous use of AC mains power and DC high voltage from battery clusters eliminates reliance on a single power source; 2) External or modular conversion modules result in smaller size and better heat dissipation; 3) Elimination of external UPS eliminates the need for a separate system, leading to a more compact system structure and lower cost. This solves the problems of "large UPS size and high cost".

[0032] A power-loss-proof auxiliary power supply device includes:

[0033] Dual power interface board, which is any of the dual power interface boards described above;

[0034] as well as

[0035] A load module, connected to the bus output node, is used to receive the DC output voltage Vo. Specifically, the AC input power supply is 220V AC mains power, and the high-voltage DC input power supply comes from the DC bus of the energy storage battery cluster.

[0036] A power-loss-resistant energy storage system includes:

[0037] Dual power interface board, which is any of the dual power interface boards described above;

[0038] An energy storage module is connected to the second power input terminal and is used to output the second input power.

[0039] As a further embodiment of this utility model: the energy storage module includes:

[0040] Energy storage battery clusters;

[0041] A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power.

[0042] The energy storage inverter (PCS) has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, and is used to realize bidirectional energy conversion between the grid and the power grid.

[0043] As a further embodiment of this utility model: the input terminal of the energy storage inverter is connected to the first power input terminal;

[0044] The high-voltage box is equipped with circuit breakers and contactors for disconnecting the high-voltage circuit in case of a fault.

[0045] A power-loss-resistant energy storage system includes:

[0046] Dual power interface board, which is any of the dual power interface boards described above;

[0047] Energy storage battery clusters;

[0048] A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power.

[0049] The energy storage inverter (PCS) has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, and is used to realize bidirectional energy conversion between the grid and the power grid.

[0050] DC loads such as EMS, BMS, and fire-fighting equipment are connected to the bus output node and powered by the DC output voltage Vo; and

[0051] AC loads such as air conditioners, water chillers, or fans are connected to the AC load terminal and powered by the AC output voltage Vb.

[0052] The beneficial effects of this plan are:

[0053] 1. Uninterrupted power supply: Through the voltage difference design of V1 being higher than V2 and the unidirectionality of diodes, natural and seamless power switching is achieved; if any one circuit fails, the other circuit immediately takes over, and the output Vo always remains stable.

[0054] 2. No mechanical relays or UPS required: The switching process relies entirely on semiconductor devices, with no contact action, no electric arc, and no maintenance requirements; eliminating the need for UPS battery packs, inverters, and chassis, significantly saving space and cost.

[0055] 3. Simple structure and high reliability: The circuit uses only two diodes (D1, D2) to complete priority control, with fewer components and fewer points of failure; the external AC / DC module and DC / DC module can be standardized for selection, which is convenient for mass production and field maintenance.

[0056] 4. Adaptable to AC / DC hybrid applications: The first input power source can be AC ​​mains power, and the second input power source can be directly taken from the high-voltage DC bus of the energy storage battery cluster. This utilizes existing mains power while giving full play to the self-powered advantages of the battery, thereby improving the overall energy efficiency of the system.

[0057] 5. Reduce system cost and size: After eliminating the UPS, only one interface board and two modules are needed in the cabinet to complete the dual power supply protection. Compared with the traditional solution, the size is reduced by several times and the cost is significantly reduced.

[0058] In summary, by using a dual-channel DC converter scheme of "differential voltage priority + diode parallel connection" in conjunction with AC / DC and DC / DC conversion modules, the problem of power loss in the control system caused by mains power failure is solved, while avoiding the high cost and large size of external UPS. This achieves a miniaturized, low-cost, maintenance-free and highly reliable power-loss auxiliary power supply solution. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the energy storage system connection of this utility model.

[0060] Figure 2 This is a schematic diagram of the circuit connection structure of the dual power supply interface board of this utility model.

[0061] Figure 3 This is a schematic diagram of the PCB port interface of the dual power supply interface board of this utility model.

[0062] Figure 4 This is a schematic diagram of the circuit principle for input voltage detection and undervoltage fault output of the dual power supply interface board of this utility model. Detailed Implementation

[0063] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection method.

[0064] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. The terminology used in this specification of this utility model is only for the purpose of describing specific embodiments and is not intended to limit this utility model.

[0065] like Figures 1-4 As shown, this embodiment of the utility model provides a dual power interface board, including:

[0066] The first DC input terminal is used to receive the first converted voltage V1;

[0067] The second DC input terminal is used to receive the second converted voltage V2;

[0068] The bus output node is used to provide DC output voltage Vo to an external load;

[0069] The first unidirectional conducting element has its positive terminal connected to the first DC input terminal and its negative terminal connected to the bus output node.

[0070] The second unidirectional conducting element has its negative terminal connected to the second DC input terminal and its negative terminal connected to the bus output node.

[0071] The rated voltage of the first conversion voltage V1 is higher than the rated voltage of the second conversion voltage V2. This higher rated voltage ensures that, under normal circumstances, the first conversion voltage V1 takes precedence. However, if the system experiences a power outage or malfunction, causing the first conversion voltage V1 to fall below the second conversion voltage V2, the second conversion voltage V2 will automatically maintain power supply to the external load.

[0072] As a further aspect of this utility model, it also includes:

[0073] The first power input terminal is used to receive the first input power.

[0074] The second power input terminal is used to receive the second input power.

[0075] The first conversion module is connected between the first power input terminal and the first DC input terminal, and is used to convert the first input power into the first conversion voltage V1;

[0076] The second conversion module is connected between the second power input terminal and the second DC input terminal, and is used to convert the second input power supply into the second conversion voltage V2.

[0077] As a further embodiment of this utility model, it also includes an AC load terminal, which is connected to the first power input terminal and connected in parallel with the input terminal of the first conversion module, for providing an AC output voltage Vb to the external load.

[0078] As a further embodiment of this utility model, it also includes a protection unit and an undervoltage detection unit. Wherein:

[0079] The protection unit is connected between the first power input terminal and the first DC input terminal, and is used to cut off the input of the first transformed voltage in case of overload or short circuit.

[0080] The undervoltage detection unit is connected to the first DC input terminal and the second DC input terminal respectively, and is used to receive the first conversion voltage V1 and the second conversion voltage V2. When either the first conversion voltage V1 or the second conversion voltage V2 is lower than a set threshold, a fault alarm signal is output.

[0081] As a further aspect of this utility model: both the first transformation voltage V1 and the second transformation voltage V2 are DC voltages;

[0082] The first power input terminal is an AC input terminal, the first input power supply is an AC input power supply, and the first conversion module is an isolated AC / DC module;

[0083] The second power input terminal is a DC high voltage input terminal, the second input power supply is a DC input power supply, and the second conversion module is an isolated DC / DC module;

[0084] The first unidirectional conducting element is diode D1, and the second unidirectional conducting element is diode D2;

[0085] The fault alarm signal is a digital I / O level signal;

[0086] The protection unit is a fuse or a thermal circuit breaker.

[0087] In detail:

[0088] 1) Under normal conditions, the high-voltage side V1 is powered via the forward conduction of the diode; 2) When V1 drops below V2 (mains power failure), the diode containing V1 is reverse biased and cut off, while the diode containing V2 is forward conduction, instantly switching to the backup circuit to ensure uninterrupted power supply to the output Vo. This solves the problem of "control circuit power failure due to mains power failure".

[0089] II. 1) Simultaneous use of AC mains power and DC high voltage from battery clusters eliminates reliance on a single power source; 2) External or modular conversion modules result in smaller size and better heat dissipation; 3) Elimination of external UPS eliminates the need for a separate system, leading to a more compact system structure and lower cost. This solves the problems of "large UPS size and high cost".

[0090] A power-loss-resistant auxiliary power supply device includes: a dual power interface board and a load module. Wherein:

[0091] Dual power interface board, which is any of the dual power interface boards described above;

[0092] A load module, connected to the bus output node, is used to receive the DC output voltage Vo. Specifically, the AC input power supply is 220V AC mains power, and the high-voltage DC input power supply comes from the DC bus of the energy storage battery cluster.

[0093] A power-loss-resistant energy storage system includes: a dual power interface board and an energy storage module. Wherein:

[0094] Dual power interface board, which is any of the dual power interface boards described above;

[0095] An energy storage module is connected to the second power input terminal and is used to output the second input power.

[0096] As a further embodiment of this utility model: the energy storage module includes: an energy storage battery cluster and a high-voltage box energy storage inverter PCS. Wherein:

[0097] A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power.

[0098] A power storage inverter (PCS) has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, used to realize bidirectional energy conversion between the PCS and the power grid. PCS stands for Power Conversion System.

[0099] As a further embodiment of this utility model: the input terminal of the energy storage inverter is connected to the first power input terminal;

[0100] The high-voltage box is equipped with circuit breakers and contactors for disconnecting the high-voltage circuit in case of a fault.

[0101] A power-loss-resistant energy storage system includes: a dual power interface board, an energy storage battery cluster, a high-voltage box, an energy storage inverter PCS, a DC load, and an AC load. Wherein:

[0102] Dual power interface board, which is any of the dual power interface boards described above;

[0103] A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power.

[0104] The energy storage inverter PCS has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, which is used to realize bidirectional energy conversion between the grid and the power grid.

[0105] DC loads, connected to the bus output node, are powered by DC output voltage Vo, such as EMS, BMS, and fire-fighting devices;

[0106] An AC load, connected to the AC load terminal, is powered by the AC output voltage Vb, such as an air conditioner, water chiller, or fan.

[0107] This solution, through the dual power supply interface board and its supporting system, achieves the following beneficial effects:

[0108] 1. Achieve seamless switching and avoid power outages.

[0109] The rated value of the first transformation voltage V1 is higher than that of the second transformation voltage V2. The two power supplies are connected in parallel to the bus output node via diodes. Under normal conditions, V1 is in the conducting state; when V1 drops below V2 due to a mains power failure, the diodes automatically turn off / on, and V2 immediately takes over the power supply task, realizing natural voltage difference switching without the need for mechanical relays, and the output Vo is uninterrupted.

[0110] 2. Eliminates the need for an external UPS, saving space and cost.

[0111] The first power input terminal connects to 220V AC mains power and passes through an isolated AC / DC module, while the second power input terminal draws high voltage from the battery pack and passes through an isolated DC / DC module. Both are integrated within the interface board system, directly supplying power to the control load, replacing traditional UPS systems, and significantly reducing size and manufacturing costs.

[0112] 3. Overload and short circuit safety protection

[0113] A fuse or thermal circuit breaker is connected in series on the first power input side to immediately disconnect the circuit when a short circuit or overcurrent occurs on the AC side, protecting downstream devices and cables and improving system safety.

[0114] 4. Real-time undervoltage monitoring and alarm

[0115] The undervoltage detection unit monitors V1 and V2 simultaneously. When either one falls below the threshold, it outputs a digital IO alarm signal, which facilitates timely handling by the host computer or fire protection system and avoids failure blind spots.

[0116] 5. Compatible with both AC and DC loads

[0117] The interface board retains the AC load terminal Vb, which can directly power AC equipment such as air conditioners, water chillers, and fans; at the same time, the bus output Vo powers DC loads such as EMS, BMS, and fire protection, meeting the mixed AC and DC power needs inside the energy storage cabinet.

[0118] 6. Adapts to the overall architecture of the energy storage system, improving the overall reliability of the cabinet.

[0119] The dual power interface board forms a closed loop with the PCS, high-voltage box, and battery cluster. When the high-voltage box contactor or circuit breaker operates, power can still be maintained through the backup circuit, ensuring that fault recording and fire-fighting linkage functions remain effective and significantly improving the safety and reliability of the energy storage system under extreme conditions.

[0120] In summary, this solution integrates dual power supply, unidirectional isolation, overload protection, and undervoltage monitoring functions within the same interface board, achieving uninterrupted, monitorable, and safe power supply to key control units at low cost and in a small size. This effectively solves the problems of large size, high cost, and unreliable switching in existing UPS technologies.

[0121] Specifically:

[0122] like Figure 1 A power-loss-protected energy storage system includes an AC / DC PCS system, a high-voltage box, and battery clusters. The first input of the auxiliary power supply is taken from the AC input power supply, and the second input of the auxiliary power supply is taken from inside the high-voltage box. Multiple battery packs are connected in series to the cluster-level high-voltage box. The second input power supply is taken from the circuit breaker and grid-connected contactor inside the high-voltage box. This results in a direct system DC power supply after the battery packs are connected in series. This ensures that even if a system fault occurs and the BMS performs multiple protections and disconnects the contactor inside the high-voltage box, the second input power supply still exists. At the same time, when the circuit breaker inside the high-voltage box is disconnected, the input of the second input power supply is disconnected, preventing the power consumption of the auxiliary power supply from damaging the batteries during long-term storage.

[0123] like Figure 2The diagram shows the electrical connection of the dual power supply interface board. The first input is a 220V AC power supply, which reaches the AC input port Va of the dual power supply interface board. After passing through a protective fuse, the dual power supply interface board outputs voltage Vb. One output of voltage Vb powers AC power equipment in the energy storage system, such as fans, air conditioners, and water chillers. In the event of a short circuit or overload at the output of voltage Vb, the protective fuse on the dual power supply interface board blows, realizing the fault protection function of the system. Simultaneously, voltage Vb is output to an external AC / DC module (i.e., an AC / DC power module or AC / DC isolation converter) to obtain a 24V DC voltage V1. This voltage returns to the DC input port 1 of the dual power supply interface board. The DC voltage V1 passes through diode D1 on the dual power supply interface board and outputs voltage Vo.

[0124] The second input is a high-voltage DC battery pack. In a 1000V system, this is typically no more than 1000V DC, and in a 1500V system, it's typically no more than 1500V DC. This high-voltage DC is converted by an isolated DC / DC module (i.e., a DC / DC step-down module or DC / DC step-down converter) to output a rated DC voltage V2 of 23.5V. V2 then passes through diode D2 to the bus output voltage Vo. The rated voltage V2 is intentionally designed to be 23.5V, 0.5V lower than the 24V of DC voltage V1. Simultaneously, the power consumption of this isolated DC / DC step-down converter is lower than that of the AC / DC isolated converter for the first input. The lower voltage of V2 ensures that power is drawn from AC when the first AC input is normal. This allows the power consumption of the V2 power supply (i.e., the DC / DC converter's power supply) to be designed to be smaller, only needing to meet the power requirements of critical downstream loads in case of a fault.

[0125] With the unidirectional conduction of diodes D1 and D2, DC voltage V1 can only flow to the output voltage Vo, and DC voltage V2 can only flow to the output Vo, effectively preventing reverse flow of DC voltage V1. DC voltages V1 and V2 will not interfere with each other, and DC voltage V2 can stably provide power to the system when DC voltage V1 is disconnected or fails.

[0126] The output voltage Vo supplies power to the core modules or electrical loads of the energy storage cabinet system, including the control chip MCU; status signal detection and drive control for protection switches and fire switches; the battery management unit (BMS) circuit for monitoring battery voltage, current, and temperature; communication links such as RS485, CAN, and Ethernet; and the EMS monitoring and processing unit. These components have relatively low overall power consumption, only tens of watts, but are highly critical, especially in the event of a battery system failure, requiring emergency fire suppression measures and the retention of historical fault data for post-fault analysis.

[0127] The status information of the first output voltage (DC voltage V1) and the second output voltage (DC voltage V2) are monitored separately within the dual power supply interface board. The monitored signals are used to determine whether the status is normal or abnormal. Regardless of whether DC voltage V1 or DC voltage V2 is abnormal, such as falling below 20% of its defined rated voltage, an auxiliary power supply fault can be identified, and an alarm can be issued for timely repair.

[0128] Figure 3 The diagram shows the PCB port interface of the dual power supply interface board of this invention. Multiple pins are led out from the PCB for the same signal, serving as a terminal block for signal distribution. For example, the voltage signal Vb is output to AC / DC modules and AC power supply equipment such as air conditioners and fans, all of which draw power from the output terminals J4 and J5 of the interface board, eliminating the need for additional power distribution terminal blocks with adapter cables. Similarly, the 24V output voltage signal Vo, output to EMS, BMS, displays, and fire protection systems, draws power from J3 and J20.

[0129] Figure 4 The diagram shows the input voltage detection and undervoltage fault output of the dual power supply interface board of this utility model. The first output voltage (DC voltage V1) and the second output voltage (DC voltage V2) are compared with the set voltage Vr respectively. If any voltage is lower than the voltage Vr, it indicates that the voltage of that channel is undervoltage, and the corresponding output voltage Vo outputs a low-level IO signal to give an alarm.

[0130] In the specification and claims of this solution, the terms "comprising / including" and "having / including" and their variations are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0131] Some features of this invention are described in different embodiments for clarity; however, these features may also be described in combination in a single embodiment. Conversely, some features of this invention are described only in a single embodiment for brevity; however, these features may also be described individually or in any suitable combination in different embodiments.

[0132] Finally, it should be noted that any cross-referencing or superposition of the various embodiments of this solution by those skilled in the art still falls within the original disclosure scope of this solution. Furthermore, the above descriptions are merely preferred embodiments of this utility model and are not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual power supply interface board, characterized in that, include: The first DC input terminal is used to receive the first converted voltage V1; The second DC input terminal is used to receive the second converted voltage V2; The bus output node is used to provide DC output voltage Vo to an external load; The first unidirectional conducting element has its positive terminal connected to the first DC input terminal and its negative terminal connected to the bus output node. The second unidirectional conducting element has its negative terminal connected to the second DC input terminal and its negative terminal connected to the bus output node. The rated voltage of the first transformation voltage V1 is higher than the rated voltage of the second transformation voltage V2.

2. The dual power supply interface board according to claim 1, characterized in that, Also includes: The first power input terminal is used to receive the first input power. The second power input terminal is used to receive the second input power. The first conversion module is connected between the first power input terminal and the first DC input terminal, and is used to convert the first input power into the first conversion voltage V1; The second conversion module is connected between the second power input terminal and the second DC input terminal, and is used to convert the second input power supply into the second conversion voltage V2.

3. The dual power supply interface board according to claim 2, characterized in that, Also includes: The AC load terminal is connected to the first power input terminal and is connected in parallel with the input terminal of the first conversion module to provide AC output voltage Vb to the external load.

4. The dual power supply interface board according to claim 3, characterized in that, Also includes: The protection unit is connected between the first power input terminal and the first DC input terminal, and is used to cut off the input of the first transformed voltage in case of overload or short circuit. The undervoltage detection unit is connected to the first DC input terminal and the second DC input terminal respectively, and is used to receive the first conversion voltage V1 and the second conversion voltage V2. When either the first conversion voltage V1 or the second conversion voltage V2 is lower than a set threshold, a fault alarm signal is output.

5. The dual power supply interface board according to claim 4, characterized in that, The first transformation voltage V1 and the second transformation voltage V2 are both DC voltages; The first power input terminal is an AC input terminal, the first input power supply is an AC input power supply, and the first conversion module is an AC / DC module; The second power input terminal is a DC high voltage input terminal, the second input power supply is a DC input power supply, and the second conversion module is a DC / DC module; The first unidirectional conducting element is diode D1, and the second unidirectional conducting element is diode D2; The fault alarm signal is a digital I / O level signal; The protection unit is a fuse or a thermal circuit breaker.

6. A power-loss-proof auxiliary power supply device, characterized in that, include: The dual power interface board is the dual power interface board as described in any one of claims 2-5; as well as The load module is connected to the bus output node and is used to receive the DC output voltage Vo.

7. A power-loss-resistant energy storage system, characterized in that, include: The dual power interface board is the dual power interface board as described in any one of claims 2-5; An energy storage module is connected to the second power input terminal and is used to output the second input power.

8. The power-loss-resistant energy storage system according to claim 7, characterized in that, The energy storage module includes: Energy storage battery clusters; A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power. The energy storage inverter PCS has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, and is used to realize bidirectional energy conversion between the grid and the power grid.

9. The power-loss-resistant energy storage system according to claim 8, characterized in that, The input terminal of the energy storage inverter is connected to the first power input terminal; The high-voltage box is equipped with circuit breakers and contactors for disconnecting the high-voltage circuit in case of a fault.

10. A power-loss-resistant energy storage system, characterized in that, include: The dual power interface board is the dual power interface board as described in any one of claims 3-5; Energy storage battery clusters; A high-voltage box is connected to the energy storage battery cluster and the second power input terminal respectively, and is used to output the second input power. The energy storage inverter PCS has an input terminal connected to the power grid and an output terminal connected to the high-voltage box, which is used to realize bidirectional energy conversion between the grid and the power grid. A DC load, connected to the bus output node, is powered by the DC output voltage Vo; and An AC load is connected to the AC load terminal and is powered by the AC output voltage Vb.

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