A three-level power supply circuit of an energy storage cabinet controller
By designing a three-level power supply circuit for the energy storage cabinet controller, and utilizing power switching relays and AC/DC converters to prioritize the use of grid and photovoltaic power, the problem of battery over-discharge in the energy storage cabinet controller was solved, reducing material costs and maintenance expenses, and extending battery life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 宁波德业储能科技有限公司
- Filing Date
- 2025-05-21
- Publication Date
- 2026-06-12
AI Technical Summary
Existing energy storage cabinet controller power supply circuits suffer from high material costs, battery over-discharge, and shortened lifespan. In particular, when the power grid and emergency power supply are interrupted for extended periods, direct battery power supply leads to battery over-discharge, increasing maintenance costs.
Design a three-level power supply circuit for an energy storage cabinet controller. By combining a power switching relay and an AC/DC converter, it prioritizes the use of the grid and photovoltaic input for power supply. When the battery power is insufficient, it disconnects the converter from the battery circuit to avoid over-discharge of the battery and saves materials for the DC/DC converter and competing power supply diodes.
It effectively avoids battery over-discharge, reduces operating and maintenance costs, saves materials for DC/DC converters and competing power supply diodes, and improves battery life and system economy.
Smart Images
Figure CN224355844U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of energy storage cabinet technology, specifically a three-level power supply circuit for an energy storage cabinet controller. Background Technology
[0002] An energy storage cabinet is an integrated energy storage device, mainly used to store electrical energy and release it when needed, in order to optimize energy use and ensure a stable power supply.
[0003] The energy storage controller is the most critical control power source for the energy storage cabinet, therefore, power outages are generally not permitted. Therefore, in related technologies, see [link to relevant documentation]. Figure 1 The energy storage controller is powered by electricity from the battery through a DC / DC converter, emergency power supply, and the power grid through a power switching relay, then through an AC / DC converter, and finally through a competing power supply diode. The power grid takes priority over the emergency power supply when powering the energy storage controller. The energy storage controller is powered by the battery, the power grid, and the emergency power supply. Figure 1 In Chinese, PV refers to photovoltaics, BAT refers to batteries, LOAD refers to loads, GRID refers to the power grid, UPS (AC) refers to AC emergency power supply, DC / DC refers to DC-DC converter, AC / DC converter refers to AC-DC converter, and CT refers to current transformer.
[0004] This power supply method has the following drawbacks: 1. In terms of material costs, the circuit connecting the battery to the energy storage controller requires two components: a DC / DC converter and a competing power supply diode, which increases operating and maintenance costs. 2. In terms of electrical circuit control, when the power grid and emergency power supply are without power for an extended period, the energy storage controller and some of its peripherals directly draw power from the battery, consuming its charge. Although short-term power outages may not have much impact, prolonged outages could lead to over-discharge of the battery, increasing maintenance costs and reducing battery life. Utility Model Content
[0005] This utility model addresses the shortcomings of existing technologies by providing a three-stage power supply circuit for an energy storage cabinet controller. This power supply circuit can disconnect the inverter from the battery circuit when the battery is depleted, effectively preventing battery over-discharge and saving materials for the DC / DC converter and competing power supply diode, thus reducing operating and maintenance costs.
[0006] To solve the aforementioned technical problems, this utility model provides a three-level power supply circuit for an energy storage cabinet controller, comprising several power input terminals, several power loads, a converter, and an energy storage controller. The power input terminals include batteries, and are connected to the power loads. The converter is connected to both the batteries and the power loads. The power loads are connected to a first power switching relay, which is connected to an AC / DC converter. The AC / DC converter is connected to the energy storage controller, and the first power switching relay switches the power input terminals supplying power to the energy storage controller. This power supply circuit disconnects the converter from the battery circuit when the battery is depleted, reducing the risk of over-discharge and saving materials for the DC / DC converter and competing power supply diodes, thus reducing operating and maintenance costs.
[0007] In the above technical solution, preferably, a plurality of power input terminals include an emergency power supply, a second power switching relay is provided between the first power switching relay and the AC / DC converter, the emergency power supply and the first power switching relay are respectively connected to the second power switching relay, and the second power switching relay is connected to the AC / DC converter.
[0008] In the above technical solution, preferably, the emergency power supply includes an AC emergency power supply.
[0009] In the above technical solution, preferably, the plurality of power input terminals include photovoltaic input terminals, the plurality of power loads include a first household load, the photovoltaic input terminals are connected to the inverter, and the inverter is connected to the first household load.
[0010] In the above technical solution, preferably, the first household load includes a resistive load, an inductive load, or a capacitive load.
[0011] In the above technical solution, preferably, a plurality of the power input terminals include a power grid, and a plurality of the power loads include a second household load, wherein the power grid is connected to the second household load.
[0012] In the above technical solution, preferably, a current transformer is provided between the power grid and the second household load.
[0013] In the above technical solution, preferably, the second household load includes a resistive load, an inductive load, or a capacitive load.
[0014] In the above technical solution, preferably, the battery is connected to the input terminal of the converter, and the electrical load is connected to the output terminal of the converter.
[0015] In the above technical solution, preferably, the input terminals of several of the electrical loads are connected to the input terminal of the first power switching relay.
[0016] Compared with the prior art, this utility model has the following advantages: when the battery is depleted, this power supply circuit can disconnect the inverter from the battery circuit, which will not easily lead to over-discharge of the battery. It can also save two materials, namely the DC / DC converter and the competing power supply diode, and reduce the operating and maintenance costs. Attached Figure Description
[0017] Figure 1 This is a circuit connection diagram for the background technology of this utility model.
[0018] Figure 2 This is a circuit connection diagram of Embodiment 1 of the present invention.
[0019] Figure 3 This is a circuit connection diagram of Embodiment 2 of the present invention.
[0020] The components represented by the reference numerals in the attached figures are as follows: 1. Converter; 2. Energy storage controller; 3. Battery; 4. First power switching relay; 5. AC / DC converter; 6. Emergency power supply; 7. Second power switching relay; 8. Photovoltaic input terminal; 9. First household load; 10. Power grid; 11. Second household load; 12. Current transformer. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figure 2 ,
[0022] A three-level power supply circuit for an energy storage cabinet controller includes several power input terminals, several power loads, a converter 1, and an energy storage controller 2. The power input terminals include batteries 3, which are connected to several power loads. The converter 1 is connected to the batteries 3 and several power loads respectively. The several power loads are connected to a first power switching relay 4. The first power switching relay 4 is connected to an AC / DC converter 5, which is connected to the energy storage controller 2. The first power switching relay 4 switches the power input terminals supplying power to the energy storage controller 2. The batteries 3 are connected to the input terminals of the converter 1, the power loads are connected to the output terminals of the converter 1, and the input terminals of the several power loads are connected to the input terminals of the first power switching relay 4.
[0023] Several power input terminals include an emergency power supply 6. A second power switching relay 7 is provided between the first power switching relay 4 and the AC / DC converter 5. The emergency power supply 6 and the first power switching relay 4 are respectively connected to the second power switching relay 7, and the second power switching relay 7 is connected to the AC / DC converter 5. Among them, the emergency power supply 6 includes an AC emergency power supply.
[0024] Several power input terminals include a photovoltaic input terminal 8, and several power loads include a first household load 9. The photovoltaic input terminal 8 is connected to an inverter 1, and the inverter 1 is connected to the first household load 9. The first household load 9 includes resistive loads, inductive loads, or capacitive loads.
[0025] Several power input terminals include a power grid 10, and several power loads include a second household load 11, with the power grid 10 connected to the second household load 11. The second household load 11 may be a resistive load, an inductive load, or a capacitive load. A current transformer 12 is installed between the power grid 10 and the second household load 11.
[0026] Specifically, the three-level power supply circuit includes four power input terminals, two power loads, a converter 1, and an energy storage controller 2. The four power input terminals include a battery 3, an emergency power supply 6, a photovoltaic input terminal 8, and a power grid 10. The two power loads include a first household load 9 and a second household load 11. Figure 1 In Chinese, PV refers to photovoltaics, BAT refers to batteries, LOAD refers to loads, GRID refers to the power grid, UPS (AC) refers to AC emergency power supply, AC / DC converter refers to AC-DC converter, and CT refers to current transformer.
[0027] Battery 3 and photovoltaic input terminal 8 are connected to the input terminal of inverter 1. Inverter 1 includes an inverter. The output terminal of inverter 1 is connected to the first household load 9. The power grid 10 is connected to the second household load 11. The first household load 9 and the second household load 11 can include resistive, inductive, or capacitive loads, such as electric kettles, rice cookers, refrigerators, air conditioners, and mobile phone chargers. To regulate the voltage, a current transformer 12 is installed between the power grid 10 and the second household load 11.
[0028] The input terminals of the first household load 9 and the second household load 11 are connected to the input terminal of the first power switching relay 4. The output terminals of the emergency power supply 6 and the first power switching relay 4 are connected to the input terminal of the second power switching relay 7. The output terminal of the second power switching relay 7 is connected to the input terminal of the AC / DC converter 5. The output terminal of the AC / DC converter 5 is connected to the energy storage controller 2. The first power switching relay 4 switches the power input terminal that supplies power to the energy storage controller 2.
[0029] This power supply circuit mainly supplies power to the first household load 9 through the photovoltaic input terminal 8 and to the second household load 11 through the power grid 10. When the power grid 10 is powered, the first power switching relay 4 and the second power switching relay 7 control the power grid 10 to supply power to the energy storage controller 2. When the power grid 10 is de-energized, power is supplied by the photovoltaic input terminal 8. When both the power grid 10 and the photovoltaic input terminal 8 are de-energized, power is supplied by the emergency power supply 6. When the power grid 10, the photovoltaic input terminal 8, and the emergency power supply 6 are all de-energized, power is supplied by the battery 3. When the battery 3 is de-energized, the circuit between the inverter 1 and the battery 3 can be disconnected, which will not easily lead to over-discharge of the battery 3. Moreover, compared with the connection structure in the background technology, it can save two materials, namely the DC / DC converter and the competing power supply diode, and reduce the operation and maintenance costs.
[0030] See Figure 3 Example 2: A three-level power supply circuit for an energy storage cabinet controller includes several power input terminals, several power loads, a converter 1, and an energy storage controller 2. The several power input terminals include a battery 3, which is connected to several power loads. The converter 1 is connected to the battery 3 and several power loads respectively. The several power loads are connected to a first power switching relay 4. The first power switching relay 4 is connected to an AC / DC converter 5, which is connected to the energy storage controller 2. The first power switching relay 4 switches the power input terminal supplying power to the energy storage controller 2. The battery 3 is connected to the input terminal of the converter 1, the power loads are connected to the output terminal of the converter 1, and the input terminals of the several power loads are connected to the input terminals of the first power switching relay 4.
[0031] Several power input terminals include a photovoltaic input terminal 8, and several power loads include a first household load 9. The photovoltaic input terminal 8 is connected to an inverter 1, and the inverter 1 is connected to the first household load 9. The first household load 9 includes resistive loads, inductive loads, or capacitive loads.
[0032] Several power input terminals include a power grid 10, and several power loads include a second household load 11, with the power grid 10 connected to the second household load 11. The second household load 11 may be a resistive load, an inductive load, or a capacitive load. A current transformer 12 is installed between the power grid 10 and the second household load 11.
[0033] Specifically, the three-level power supply circuit includes three power input terminals, two power loads, a converter 1, and an energy storage controller 2. The three power input terminals include a battery 3, a photovoltaic input terminal 8, and a power grid 10. The two power loads include a first household load 9 and a second household load 11. Figure 2 In this context, PV refers to photovoltaics, BAT refers to batteries, LOAD refers to loads, GRID refers to the power grid, UPS (AC) refers to AC emergency power supply, AC / DC converter refers to AC-DC converter, and CT refers to current transformer.
[0034] Battery 3 and photovoltaic input terminal 8 are connected to the input terminal of inverter 1. Inverter 1 includes an inverter. The output terminal of inverter 1 is connected to the first household load 9. The power grid 10 is connected to the second household load 11. The first household load 9 and the second household load 11 include resistive, inductive, or capacitive loads, such as electric kettles, rice cookers, refrigerators, air conditioners, and mobile phone chargers. To regulate the voltage, a current transformer 12 is installed between the power grid 10 and the second household load 11.
[0035] The input terminals of the first household load 9 and the second household load 11 are connected to the input terminal of the first power switching relay 4. The output terminal of the first power switching relay 4 is connected to the input terminal of the AC / DC converter 5. The output terminal of the AC / DC converter 5 is connected to the energy storage controller 2. The first power switching relay 4 switches the power input terminal that supplies power to the energy storage controller 2.
[0036] This power supply circuit mainly supplies power to the first household load 9 through the photovoltaic input terminal 8 and to the second household load 11 through the power grid 10. When the power grid 10 is powered, the first power switching relay 4 and the second power switching relay 7 control the power grid 10 to supply power to the energy storage controller 2. When the power grid 10 is de-energized, power is supplied by the photovoltaic input terminal 8. When both the power grid 10 and the photovoltaic input terminal 8 are de-energized, power is supplied by the battery 3. When the battery 3 is de-energized, the circuit between the inverter 1 and the battery 3 can be disconnected, which will not easily lead to over-discharge of the battery 3. Moreover, compared with the connection structure in the background technology, it can save two materials: the DC / DC converter and the competing power supply diode, thus reducing operation and maintenance costs.
[0037] Taking the above two embodiments as examples, those skilled in the art will readily understand that the number of power input terminals and power loads can be increased or decreased as needed. Among these power input terminals, under the control of the power switching relay, the power grid has the highest priority in supplying power to the energy storage controller, followed by the photovoltaic input terminal, then the emergency power supply, and finally the battery. When the battery is out of power, the converter and battery circuit can be disconnected, which will not easily lead to battery over-discharge. Moreover, compared with the connection structure in the background technology, it can save two materials: the DC / DC converter and the competing power supply diode, thereby reducing operation and maintenance costs.
[0038] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.
Claims
1. A three-level power supply circuit for an energy storage cabinet controller, comprising a plurality of power input terminals, a plurality of power loads, a converter (1), and an energy storage controller (2), wherein the plurality of power input terminals include batteries (3), and the plurality of power input terminals are connected to the plurality of power loads, characterized in that: The converter (1) is connected to the battery (3) and several electrical loads respectively. The several electrical loads are connected to a first power switching relay (4). The first power switching relay (4) is connected to an AC / DC converter (5). The AC / DC converter (5) is connected to the energy storage controller (2). The first power switching relay (4) switches the power input terminal that supplies power to the energy storage controller (2).
2. The three-level power supply circuit for an energy storage cabinet controller as described in claim 1, characterized in that: Several of the power input terminals include an emergency power supply (6), and a second power switching relay (7) is provided between the first power switching relay (4) and the AC / DC converter (5). The emergency power supply (6) and the first power switching relay (4) are respectively connected to the second power switching relay (7), and the second power switching relay (7) is connected to the AC / DC converter (5).
3. The three-level power supply circuit for an energy storage cabinet controller as described in claim 2, characterized in that: The emergency power supply (6) includes an AC emergency power supply.
4. The three-level power supply circuit for an energy storage cabinet controller as described in claim 1, characterized in that: The plurality of power input terminals include a photovoltaic input terminal (8), and the plurality of power loads include a first household load (9). The photovoltaic input terminal (8) is connected to the inverter (1), and the inverter (1) is connected to the first household load (9).
5. The three-level power supply circuit for an energy storage cabinet controller as described in claim 4, characterized in that: The first household load (9) includes resistive load, inductive load or capacitive load.
6. The three-level power supply circuit for an energy storage cabinet controller as described in claim 1, characterized in that: Some of the power input terminals include a power grid (10), and some of the power loads include a second household load (11), the power grid (10) being connected to the second household load (11).
7. The three-level power supply circuit for an energy storage cabinet controller as described in claim 6, characterized in that: A current transformer (12) is provided between the power grid (10) and the second household load (11).
8. The three-level power supply circuit for an energy storage cabinet controller as described in claim 6, characterized in that: The second household load (11) includes resistive loads, inductive loads, or capacitive loads.
9. The three-level power supply circuit for an energy storage cabinet controller as described in claim 1, characterized in that: The battery (3) is connected to the input terminal of the converter (1), and the power load is connected to the output terminal of the converter (1).
10. The three-level power supply circuit for an energy storage cabinet controller as described in claim 1, characterized in that: The input terminals of several of the electrical loads are connected to the input terminal of the first power switching relay (4).