A power supply device and a power supply system

Abstract

The application relates to the charging technical field, and provides a power supply device and a power supply system. The power supply device provided by the application comprises a power grid connecting end, the power grid connecting end being suitable for connecting a power grid; an energy storage connecting end, the energy storage connecting end being suitable for connecting an energy storage module; a terminal connecting end, the terminal connecting end being suitable for outputting a voltage; and a switching module, a first end of the switching module being connected with the power grid connecting end, a second end of the switching module being connected with the energy storage connecting end, and a third end of the switching module being connected with the terminal connecting end, the switching module being suitable for realizing switching between a power grid power supply mode and an energy storage power supply mode, the power grid power supply mode being that the power grid connecting end is connected with the terminal connecting end, and the energy storage power supply mode being that the energy storage connecting end is connected with the terminal connecting end.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a power supply device and power supply system. Background Technology

[0002] In the context of current energy transition and sustainable development, the increasing complexity of the global power system has led to uncertainties in the power supply stability of charging stations. The power fluctuations provided by power grids in different regions and scenarios vary significantly, placing higher demands on the reliability of power supply to charging stations and urgently requiring solutions to the problems of grid instability or complete grid outages in charging systems. Summary of the Invention

[0003] This application aims to solve the problems in related technologies and proposes a power supply device and power supply system.

[0004] This application provides a power supply device, including:

[0005] A power grid connection terminal, which is suitable for connecting to a power grid;

[0006] Energy storage connection terminal, which is suitable for connection to energy storage module;

[0007] Terminal connection end, the terminal connection end is suitable for output voltage;

[0008] The switching module has a first end connected to the grid connection end, a second end connected to the energy storage connection end, and a third end connected to the terminal connection end. The switching module is suitable for switching between grid power supply mode and energy storage power supply mode. In grid power supply mode, the grid connection end is connected to the terminal connection end, and in energy storage power supply mode, the energy storage connection end is connected to the terminal connection end.

[0009] In some alternative implementations, the switching module includes a converter, with a first end connected to the grid connection terminal, a second end connected to the energy storage connection terminal, and a third end connected to the terminal connection terminal.

[0010] And / or, the switching module includes a switching switch, the first end of which is connected to the grid connection terminal, the second end of which is connected to the terminal connection terminal, and the third end of which is connected to the energy storage connection terminal.

[0011] In some alternative embodiments, the converter includes: a first AC transformer and a first DC transformer, a first terminal of the first AC transformer being connected to a grid connection terminal, a first terminal of the first DC transformer being connected to a second terminal of the first AC transformer; a second terminal of the first DC transformer being connected to a terminal connection terminal, and a third terminal of the first DC transformer being connected to an energy storage connection terminal.

[0012] In some alternative implementations, the power supply device includes a host load, a first end of which is connected to the output of the switching module;

[0013] In some alternative embodiments, the power supply device further includes a second AC transformer, with a first end of the second AC transformer connected to the power grid connection end and a second end of the second AC transformer connected to the second end of the host load.

[0014] In some alternative implementations, the power supply device further includes a controller connected to the switching module, the controller being configured to control the switching module to implement grid power supply mode or energy storage power supply mode.

[0015] In some optional implementations, the grid power supply mode is as follows: the first end of the control converter is connected to the grid connection terminal, and the third end of the converter is connected to the terminal connection terminal; the energy storage power supply mode is as follows: the second end of the converter is connected to the energy storage connection terminal, and the third end of the converter is connected to the terminal connection terminal.

[0016] And / or, the grid power supply mode is: the control switch is open, and the grid connection terminal and the terminal connection terminal are connected; the energy storage power supply mode is: the control switch is closed, and the energy storage connection terminal and the terminal connection terminal are connected.

[0017] This application also provides a power supply system, including: an energy storage module and the power supply device connected to each other.

[0018] In some alternative implementations, the energy storage module includes an energy storage unit connected to the switching module.

[0019] In some alternative implementations, the energy storage module further includes a first switch, with a first end connected to an energy storage connection terminal and a second end connected to an energy storage unit.

[0020] In some alternative implementations, the energy storage module includes a second DC transformer, with a first end of the second DC transformer connected to the energy storage connection terminal of the power supply device, and a second end of the second DC transformer connected to the energy storage unit.

[0021] In some alternative implementations, the energy storage module further includes a start switch, the first end of which is connected to the first end of the second DC transformer, and the second end of which is connected to the energy storage connection end.

[0022] In some alternative implementations, the power supply system further includes a terminal module, the input of which is connected to the terminal connection of the power supply device.

[0023] In some alternative implementations, the terminal module includes a fast charging terminal and a flash charging terminal.

[0024] In summary, this application can achieve at least the following technical effects:

[0025] The power supply device of this application connects to a grid connection terminal suitable for connecting to the power grid, an energy storage connection terminal suitable for connecting to the energy storage module, and a terminal connection terminal suitable for output voltage through a switching module, so as to realize the switching between grid power supply mode and energy storage power supply mode. In the case of grid instability or no grid at all, the grid power supply mode is switched to energy storage power supply mode, and a stable voltage can be provided to the terminal connection terminal through the energy storage connection terminal, thereby ensuring the normal operation of the power supply device when there is no grid. Attached Figure Description

[0026] Figure 1 This is a circuit diagram of the power supply device using a converter scheme in the embodiments of this application;

[0027] Figure 2 This is a circuit diagram of the power supply device using a switching scheme in the embodiments of this application;

[0028] Figure 3 The power supply device in this application embodiment adopts a power grid power supply mode using a converter scheme;

[0029] Figure 4 The power supply device in this application adopts a converter scheme for energy storage power supply mode;

[0030] Figure 5 This is the energy storage power shortage condition in the power supply device using the converter scheme in the embodiments of this application;

[0031] Figure 6 In this embodiment of the application, the power supply device uses a converter scheme to switch from grid power supply mode to energy storage power supply mode;

[0032] Figure 7 In this embodiment of the application, the power supply device uses a converter scheme to switch from energy storage power supply mode to grid power supply mode;

[0033] Figure 8 The power supply device in this embodiment adopts a grid power supply mode with a switching scheme;

[0034] Figure 9 The power supply device in this embodiment adopts a switching scheme for energy storage power supply.

[0035] Figure 10 In this embodiment of the application, the power supply device adopts a switching scheme to switch from grid power supply mode to energy storage power supply mode;

[0036] Figure 11 In this embodiment of the application, the power supply device adopts a switching scheme to switch from energy storage power supply mode to grid power supply mode;

[0037] Figure 12This is a circuit diagram of the first DC transformer in an embodiment of this application;

[0038] Figure 13 This is a circuit diagram of the first AC transformer in the embodiments of this application. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal closure of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Example 1:

[0046] Embodiment 1 of this application provides a power supply device, including:

[0047] A power grid connection terminal, which is suitable for connecting to a power grid;

[0048] Energy storage connection terminal, which is suitable for connection to energy storage module;

[0049] Terminal connection end, the terminal connection end is suitable for output voltage;

[0050] The switching module has a first end connected to the grid connection end, a second end connected to the energy storage connection end, and a third end connected to the terminal connection end. The switching module is suitable for switching between grid power supply mode and energy storage power supply mode. In grid power supply mode, the grid connection end is connected to the terminal connection end, and in energy storage power supply mode, the energy storage connection end is connected to the terminal connection end.

[0051] By connecting the switching module to a grid connection terminal suitable for grid connection, an energy storage connection terminal suitable for connection to the energy storage module, and a terminal connection terminal suitable for output voltage, the system switches between grid power supply mode and energy storage power supply mode. This allows for switching to energy storage power supply mode in situations where the grid is unstable or completely without a grid. The energy storage connection terminal provides a stable voltage to the terminal connection terminal, ensuring the normal operation of the power supply device when there is no grid connection. This optimizes the configuration of the power conversion and energy storage system, enabling the mobile charging pile to operate independently without relying on an external grid, effectively addressing the uncertainties caused by grid fluctuations and ensuring the stability and safety of the charging process. The terminal connection terminal connects to the terminal module, supplying power to the loads within the terminal module to ensure its normal operation. The loads within the terminal module include, but are not limited to, the thermal management system and control system within the terminal module. This embodiment is particularly suitable for emergency charging scenarios in remote areas with weak grid infrastructure or under extreme weather conditions, ensuring the normal operation of electric vehicle charging tasks when the grid is unstable or without a grid.

[0052] In some alternative implementations, the switching module includes a converter, with a first end connected to the grid connection terminal, a second end connected to the energy storage connection terminal, and a third end connected to the terminal connection terminal.

[0053] like Figure 1 As shown, by setting up a converter with three-terminal switching function, physical isolation and intelligent switching between the power grid and energy storage paths are achieved, avoiding voltage interruptions and host load surges caused by contact bounce and arc discharge during the switching process of traditional mechanical relays. The converter can realize voltage transformation, and thus can be applied to power supply devices with different voltages at the grid connection end and the terminal connection end.

[0054] In some alternative implementations, the switching module includes a switching switch disposed between the grid connection terminal and the terminal connection terminal, and / or, the first end of the switching switch is connected to the grid connection terminal, and the second end of the switching switch is connected to the energy storage connection terminal.

[0055] like Figure 2 As shown, the switching module is configured as a switching switch, such as a single-pole double-throw switch, to switch between grid power supply and energy storage power supply. Switches typically cannot achieve voltage transformation and are suitable for power supply devices where the voltage at the grid connection point and the terminal connection point is the same.

[0056] The switching architecture uses two sets of solid-state relays (SSRs) to achieve interlock control. The grid-side SSR and the energy storage-side SSR never conduct at the same time to prevent reverse current from flowing in. It has a simple structure, low cost, and is suitable for the deployment of charging piles for low- and mid-range vehicles.

[0057] The switching module can also be configured as both a converter and a transfer switch, making it suitable for power supply devices with different voltages at the grid connection point and the terminal connection point, thus improving system design flexibility. The converter and transfer switch can be used independently, configured in parallel, or used simultaneously to enhance system fault tolerance, or both to improve efficiency and adaptability.

[0058] In some alternative embodiments, the converter includes: a first AC transformer and a first DC transformer, a first terminal of the first AC transformer being connected to a grid connection terminal, a first terminal of the first DC transformer being connected to a second terminal of the first AC transformer; a second terminal of the first DC transformer being connected to a terminal connection terminal, and a third terminal of the first DC transformer being connected to an energy storage connection terminal.

[0059] like Figure 13 As shown, the converter adopts a hybrid isolated power supply architecture. The first AC transformer (ACDC1) is a power frequency isolation transformer. Its primary side is connected to the power grid connection terminal, and the secondary side is rectified and filtered to form high-voltage DC (such as 310V or 384V), which serves as the input terminal of the first DC transformer; as shown... Figure 12 As shown, the first DC transformer (DC / DC1) is a high-frequency isolated DC-DC converter. Its primary side is connected to both the output terminal and the energy storage connection terminal of the first AC transformer, and its secondary side outputs low-voltage DC power (such as 48V, 124V, 12V) to the terminal connection terminal.

[0060] When the grid supplies power, energy is transmitted from the grid connection terminal through the first AC transformer → the first DC transformer → the terminal connection terminal. When switching to energy storage power supply, the high-voltage DC power output by the energy storage module is injected in reverse into the primary side of the first DC transformer, and after inversion, isolation and rectification, it is output to the terminal connection terminal, realizing bidirectional energy transmission.

[0061] By adding ACCDC1 and DC / DC1, the high-voltage electricity stored in the power supply unit is converted into the voltage required by the main load and the load in the terminal module when there is no grid input, so as to facilitate the operation of the overall system when there is no grid. DC / DC1 adopts a bidirectional DC-DC topology, which integrates two independent power channels and shares a common output node. Seamless switching of energy flow is achieved through synchronous PWM control.

[0062] In some alternative implementations, the power supply device includes a host load, a first end of which is connected to the output of the switching module;

[0063] The first terminal of the main load is connected to the output terminal of the switching module, and the first terminal of the main load is connected to the second terminal of the second AC transformer. The main load consists of auxiliary equipment such as the main control unit, communication module, human-machine interface screen, and cooling fan inside the charging pile. Its rated operating voltage is usually low voltage, and it is directly powered by the low voltage DC bus output from DC / DC1 in the switching module to ensure that the system status record and safe shutdown process can still be maintained after the power grid is cut off.

[0064] In some alternative embodiments, the power supply device further includes a second AC transformer, with a first end of the second AC transformer connected to the power grid connection end and a second end of the second AC transformer connected to the second end of the host load.

[0065] To accommodate special terminals requiring AC output (such as mobile charging vehicles or temporary emergency lighting), a second AC transformer (ACDC2) can be optionally added to the power supply unit. ACDC2 is a high-frequency isolated inverter transformer. Its primary side is connected to the DC output of the energy storage module, while its secondary side outputs 220V / 50Hz sinusoidal AC power, which is then filtered by an LC filter and connected to the terminal connection. When in energy storage power supply mode, the controller activates this inverter circuit to provide a stable power supply to terminals requiring AC input. This structure expands the application boundaries of the power supply unit, making it suitable not only for DC fast charging but also as a mobile emergency power source, meeting the compatibility requirements of multiple scenarios.

[0066] The power supply device also includes a power output terminal, which is adapted to connect to the terminal module to supply power to the terminal module, thereby charging the vehicle to be charged through the terminal module. The third terminal of the second AC transformer is connected to the power output terminal of the power supply device, thereby enabling the power grid to charge the vehicle to be charged.

[0067] In some alternative implementations, the power supply device further includes a controller connected to the switching module, the controller being configured to control the switching module to implement grid power supply mode or energy storage power supply mode.

[0068] The controller can use a high-reliability industrial-grade MCU with an ARM Cortex-M7 core, and has a built-in dual-channel ADC for real-time sampling of grid voltage, current, frequency, and the SOC and voltage status of the energy storage module.

[0069] The controller can determine the power supply status through a preset algorithm: when the current voltage of the power grid is less than the preset voltage, such as the preset voltage being 85% or 115% of the rated voltage, and continues for more than a preset time, such as 100ms, 200ms, or 300ms, it is determined that the power grid is abnormal and the energy storage power supply mode is switched; or, the controller can determine the power supply status through a preset algorithm if the current charging frequency of the power grid deviates from the preset frequency by a certain value, such as ±1Hz, and continues for more than a preset time, it is determined that the power grid is abnormal and the energy storage power supply mode is switched.

[0070] The switching logic can adopt a "disconnect first, connect later" strategy to ensure that after disconnecting the grid path, the energy storage path is connected after a 5ms dead zone delay to avoid short circuits.

[0071] The controller can also integrate a soft-start function, which increases the output voltage in a linear ramp manner when the energy storage power supply starts, preventing surge current from impacting the host load. In addition, the controller supports remote communication, which can upload power supply mode switching events, remaining energy storage capacity, and fault codes to the cloud platform to realize operation and maintenance early warning and remote diagnosis.

[0072] In some alternative implementations, the grid power supply mode is as follows: the first end of the control converter is connected to the grid connection terminal, and the third end of the converter is connected to the terminal connection terminal; the energy storage power supply mode is as follows: the second end of the converter is connected to the energy storage connection terminal, and the third end of the converter is connected to the terminal connection terminal.

[0073] like Figure 3 As shown, this is a scheme for controlling the converter to achieve grid power supply mode. The grid connection terminal is connected to the grid, and AC power is converted into low-voltage DC power by AC / DC1 to supply power to DC / DC1. DC / DC1 supplies power to the load, energy storage connection terminal and terminal connection terminal in the power supply device. The supply voltage can be 12V or 24V, depending on the voltage required by the host load.

[0074] like Figure 4 The diagram illustrates a scheme for controlling the converter to achieve energy storage power supply mode. When there is no grid connection at the grid connection terminal, pressing the first switch of the second DC transformer causes the second DC transformer to provide a small current to start DC / DC1. DC / DC1 then converts the high voltage input at the energy storage connection terminal into low voltage to supply power to the main load and terminal connection terminals within the power supply device.

[0075] like Figure 5The diagram illustrates a scheme for switching the control converter to grid power supply mode when the energy storage module is short of power. When the energy storage module's power is about to run out (e.g., the module's power level is below the minimum power threshold), it needs to be charged by the external grid. At this point, the first switch of the second DC transformer needs to be pressed. The second DC transformer provides a small current and 12V voltage to start AC / DC1. AC / DC1 converts the grid's AC power into low-voltage power to supply DC / DC1. DC / DC1 then converts the high voltage of the energy storage module into low voltage to supply power to the main load, terminal connections, and energy storage connection terminals within the power supply unit, thus maintaining the operation of the power supply unit and replenishing the energy storage module's power.

[0076] like Figure 6 The diagram illustrates a scheme for switching the control converter to energy storage power supply mode under conditions of grid fluctuations or instability. In normal grid power supply mode, when a sudden grid outage occurs, the first switch of the second DC transformer must be pressed. The second DC transformer provides a small current and low voltage to start DC / DC1. DC / DC1 converts the high voltage of the energy storage module to a low voltage to supply power to the main load and terminal connections within the power supply unit.

[0077] like Figure 7 As shown, this solution primarily addresses scenarios involving switching from off-grid to grid-connected operation or a sudden restoration of power after a grid outage. It involves a control converter switching the energy storage power supply mode to grid-connected mode. In normal energy storage power supply mode, pressing the first switch for emergency start mode activates the second DC transformer, providing a small current and low voltage to start DC / DC1. DC / DC1 converts the high voltage input at the energy storage connection terminal to a low voltage to power the main load and terminal connections within the power supply unit. Upon grid restoration, the grid supplies power to AC / DC1, which converts the AC power to a low voltage to power DC / DC1. DC / DC1 then converts the high voltage input at the energy storage connection terminal to a low voltage to power the main load and terminal connections within the power supply unit, and disconnects the connection between the energy storage connection terminal and DC / DC1.

[0078] In some alternative implementations, the grid power supply mode is: the control switching switch is open, and the grid connection end and the terminal connection end are connected; the energy storage power supply mode is: the control switching switch is closed, and the energy storage connection end and the terminal connection end are connected.

[0079] like Figure 8 As shown, the scheme for controlling the switching switch to realize the grid power supply mode is as follows: the grid connection terminal is connected to the grid, which supplies 220V AC power to the host load in the power supply device. The power supply device is connected to the energy storage module and the terminal module, and supplies 220V AC power to the energy storage module and the terminal module. At this time, the switching switch in the power supply device is connected to the grid terminal (any phase line terminal of the grid).

[0080] like Figure 9 The diagram illustrates a scheme for controlling the switching switch to achieve energy storage power supply mode. Pressing the first switch of the second DC transformer in the energy storage module causes the second DC transformer to provide a small current and low voltage to start DC / DC1. DC / DC1 converts the high voltage of the energy storage module into a low voltage to power the main load within the power supply unit. Simultaneously, DC / DC1 starts AC / DC2 within the power supply unit. AC / DC2 converts the electricity from the energy storage module into AC power to power the terminal module and the energy storage module.

[0081] like Figure 10 The diagram illustrates the switching of the control switch to energy storage power supply mode after a sudden power outage, assuming grid fluctuations or instability. In normal grid power supply mode, the switch within the power supply unit is switched to the grid end. When the grid suddenly fails, the first switch in the second DC transformer must be pressed. The second DC transformer provides a small current and 12V voltage to start DC / DC1. The first switch within the power supply unit is switched to the AC / DC terminal (neutral terminal). DC / DC1 converts the high voltage input from the energy storage module to a low voltage to power the main load within the power supply unit. Simultaneously, DC / DC1 starts AC / DC1 within the power supply unit. AC / DC1 converts the low-voltage output from the energy storage module into AC power to supply high-voltage power to the terminal module and the energy storage module.

[0082] like Figure 11 As shown, this solution primarily addresses scenarios involving switching from no power supply to a power grid connection, or a sudden restoration of power after a grid outage. It involves using a switch to switch the energy storage module to grid-connected power mode. In normal energy storage power mode, the switch within the power supply unit is connected to the AC / DC terminal. During switching, the switch is switched to the grid terminal, connecting to the power grid and supplying 220V AC power to the main load within the power supply unit via a line connection. The power supply unit then connects to the energy storage module and the terminal module, supplying them with 220V AC power.

[0083] In the converter architecture, the controller controls the energy flow by driving the PWM signal of the MOSFET bridge arm: in grid power supply mode, the grid side bridge arm is enabled and the energy storage side bridge arm is turned off, and the energy flows unidirectionally from the grid to the host load; in energy storage power supply mode, the grid side bridge arm is turned off and the energy storage side bridge arm is enabled, and the energy flows in reverse from the energy storage module to the host load. At this time, the converter operates in Buck-Boost inverter mode.

[0084] In the switching architecture, grid-side power supply mode is achieved by disconnecting the energy storage-side SSR and closing the grid-side SSR; conversely, energy storage-side power supply mode is achieved by disconnecting the grid-side SSR and closing the energy storage-side SSR. Switching between both modes is intelligently decided by the controller based on multi-dimensional sensor data (voltage, current, temperature, etc.) to avoid erroneous switching. For example, if the energy storage module temperature exceeds 55°C, even if the grid is abnormal, the controller will delay switching and prioritize activating the air-cooling system to prevent thermal runaway and improve system safety margin.

[0085] Example 2:

[0086] Embodiment 2 of this application provides a power supply system, including: an energy storage module and the power supply device connected to each other.

[0087] By deeply integrating the aforementioned power supply device with the energy storage module, an integrated energy management unit is formed. The energy storage module may contain lithium iron phosphate battery cells, achieving high power output capability through a series-parallel topology. The switching module of the power supply device can be directly connected to the high-voltage output terminal of the energy storage module, forming a "plug-and-play" connection structure without the need for additional wiring.

[0088] In some alternative implementations, the energy storage module includes an energy storage unit connected to the switching module.

[0089] The energy storage unit can be composed of multiple lithium iron phosphate cells. The output of the energy storage unit can be connected to the energy storage connection terminal of the power supply device via a fuse or contactor. The contactor is controlled by the controller and closes with a delay when the system starts up to avoid inrush current.

[0090] In some alternative implementations, the energy storage module includes a second DC transformer, with a first end of the second DC transformer connected to the energy storage connection terminal of the power supply device, and a second end of the second DC transformer connected to the energy storage unit.

[0091] The energy storage connection terminal of the power supply device is connected to the first AC transformer and the first DC transformer, and is used to activate the first AC transformer and / or the first DC transformer through the low-voltage signal output by the second DC transformer.

[0092] A second DC transformer (DC / DC2) is added to the energy storage to power the loads of the power supply device, energy storage and terminal in the absence of a power grid.

[0093] The first end of the second DC transformer is connected to the energy storage connection terminal of the power supply device, and the second end is connected to the positive and negative terminals of the energy storage unit. When the power grid is unstable or there is no power grid, the second DC transformer can be activated manually or automatically, which in turn activates the switching module to achieve energy storage power supply.

[0094] In some alternative embodiments, the energy storage module further includes a first switch, with a first end connected to an energy storage connection terminal and a second end connected to an energy storage unit. The first switch is used to control the connection and disconnection between the energy storage connection terminal and the energy storage unit.

[0095] The first switch can be a bipolar solid-state relay (SSR) with overcurrent, overtemperature, and short-circuit protection functions.

[0096] The second DC transformer also includes an emergency controller configured to close the first switch after the conversion module is started. During normal operation, the first switch is in the open state, closing only in energy storage power supply mode to form an independent charging path from the second DC transformer to the energy storage unit. The first switch completely physically isolates the energy storage battery from the main discharge circuit of the power supply device, preventing energy backflow into the load circuit within the energy storage module during emergency charging.

[0097] In some alternative implementations, the energy storage module further includes a start switch, the first end of which is connected to the first end of the second DC transformer, and the second end of which is connected to the energy storage connection end.

[0098] The start switch, used to control the connection between the first terminal of the second DC transformer and the energy storage connection terminal, provides an alternative to the controller, enhancing control flexibility and safety as a backup. The start switch can be button-activated, allowing the user to turn it off by pressing a button.

[0099] The second DC transformer can be a high-frequency isolated bidirectional DC-DC transformer, with its primary side connected to the low-voltage output terminal of the energy storage module and its secondary side connected to the energy storage unit.

[0100] In some alternative implementations, the power supply system further includes a terminal module, the input of which is connected to the terminal connection of the power supply device.

[0101] The terminal module serves as the energy interface between the charging device and the electric vehicle. Its input terminal is directly connected to the terminal connection terminal and the power output terminal of the power supply device. Electrical energy is input to the terminal module through the terminal connection terminal to power the load inside the terminal module, ensuring its normal operation. Electrical energy is also input to the terminal module through the power output terminal to charge the vehicle being charged.

[0102] The terminal module integrates voltage / current sampling circuits, a communication protocol controller, an insulation detection unit, and a contactor drive circuit. When the power supply switches to energy storage power supply mode, the terminal module automatically identifies input voltage changes and dynamically adjusts the charging current curve to ensure constant power output even as the energy storage voltage drops. For example, when the energy storage voltage drops from 380V to 320V, the terminal module gradually increases the charging current from 80A to 95A to maintain a 30kW output and extend the effective charging time. This design significantly improves charging efficiency under energy storage power supply and avoids a sudden drop in charging power due to voltage decreases.

[0103] The converter in the switching module converts the high voltage output from the energy storage module into the low voltage of the terminal module.

[0104] The terminal module includes fast charging terminal and flash charging terminal.

[0105] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A power supply device, characterized in that, include: A power grid connection terminal, wherein the power grid connection terminal is adapted to connect to a power grid; An energy storage connection terminal, which is adapted to be connected to an energy storage module; A terminal connection end, wherein the terminal connection end is adapted to output voltage; The switching module has a first end connected to the grid connection end, a second end connected to the energy storage connection end, and a third end connected to the terminal connection end. The switching module is adapted to switch between grid power supply mode and energy storage power supply mode. In grid power supply mode, the grid connection end is connected to the terminal connection end, and in energy storage power supply mode, the energy storage connection end is connected to the terminal connection end.

2. The power supply device as described in claim 1, characterized in that, The switching module includes a converter, the first end of which is connected to the grid connection terminal, the second end of which is connected to the energy storage connection terminal, and the third end of which is connected to the terminal connection terminal. And / or, the switching module includes a switching switch, the first end of which is connected to the grid connection terminal, the second end of which is connected to the terminal connection terminal, and the third end of which is connected to the energy storage connection terminal.

3. The power supply device as described in claim 2, characterized in that, The converter includes: a first AC transformer and a first DC transformer, wherein a first end of the first AC transformer is connected to the grid connection terminal, a first end of the first DC transformer is connected to a second end of the first AC transformer, a second end of the first DC transformer is connected to the terminal connection terminal, and a third end of the first DC transformer is connected to the energy storage connection terminal.

4. The power supply device as described in claim 1, characterized in that, The power supply device includes a host load, and the first end of the host load is connected to the output end of the switching module.

5. The power supply device as described in claim 4, characterized in that, The power supply device also includes a second AC transformer, the first end of which is connected to the power grid connection terminal, and the second end of which is connected to the second end of the host load.

6. The power supply device according to any one of claims 2-5, characterized in that, The power supply device also includes a controller, which is connected to the switching module and is configured to control the switching module to implement grid power supply mode or energy storage power supply mode.

7. The power supply device as described in claim 6, characterized in that, The grid power supply mode is as follows: the first end of the converter is connected to the grid connection terminal, and the third end of the converter is connected to the terminal connection terminal; the energy storage power supply mode is as follows: the second end of the converter is connected to the energy storage connection terminal, and the third end of the converter is connected to the terminal connection terminal. And / or, the grid power supply mode is: controlling the switching switch to open, and connecting the grid connection terminal and the terminal connection terminal; the energy storage power supply mode is: controlling the switching switch to close, and connecting the energy storage connection terminal and the terminal connection terminal.

8. A power supply system, characterized in that, include: Interconnected energy storage modules and power supply devices as described in any one of claims 1-7.

9. The power supply system as described in claim 8, characterized in that, The energy storage module includes an energy storage unit, which is connected to the switching module.

10. The power supply system as described in claim 9, characterized in that, The energy storage module also includes a first switch, the first end of which is connected to the energy storage connection terminal, and the second end of which is connected to the energy storage unit.

11. The power supply system as described in claim 9, characterized in that, The energy storage module also includes a second DC transformer, the first end of which is connected to the energy storage connection terminal of the power supply device, and the second end of which is connected to the energy storage unit.

12. The power supply system as described in claim 11, characterized in that, The energy storage module also includes a start switch, the first end of which is connected to the first end of the second DC transformer, and the second end of which is connected to the energy storage connection end.

13. The power supply system as described in any one of claims 8-12, characterized in that, The power supply system also includes a terminal module, the input end of which is connected to the terminal connection end of the power supply device.

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