Backup power supply device of energy storage system

Abstract

The utility model relates to the technical field of circuit design, in particular to a back-up power supply device of an energy storage system. Comprising a relay and a storage battery, a coil KA1 of the relay is connected with commercial power, the commercial power is connected with a load, the commercial power is connected with the storage battery through a normally open contact KA3 of the relay, and the storage battery is connected with the load through a normally closed contact KA2 of the relay. The device is low in cost, small in occupied space and easy to arrange.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, in particular to a backup power supply device for an energy storage system. Background Art

[0002] The prior art uses an uninterruptible power supply UPS in conjunction with an automatic transfer switch ATS to power the load. The UPS serves as a backup power source and is connected to the backup power input port of the ATS. When the main power fails or is unstable, the ATS receives a signal and switches to the UPS for power supply. The ATS has two input ports, one connected to the main power source and the other connected to the UPS or other backup power sources. The ATS monitors the status of the main power source, and if a main power failure is detected, it automatically switches to the backup power source to maintain a continuous supply of power. With this configuration, when the main power source fails or is unstable, the ATS automatically switches the power to the UPS for power supply to maintain the normal operation of the load equipment.

[0003] Due to their large size, UPS and ATS systems usually occupy a large space for layout. In addition, they also require a suitable location for maintenance and heat dissipation, which further limits the available installation options and increases the difficulty of layout. In addition, UPS and ATS systems are usually expensive equipment, and the purchase, installation and maintenance costs are relatively high.

[0004] In summary, the existing backup power supply device for energy storage system not only has high equipment cost, but also occupies a large space and is difficult to arrange. Utility Model Content

[0005] The purpose of the utility model is to provide a backup power supply device for an energy storage system in view of the defects of the prior art, which has low cost, occupies little space and is easy to arrange.

[0006] The utility model discloses a backup power supply device for an energy storage system, comprising a relay and a battery, wherein a coil KA1 of the relay is connected to a mains power supply, the mains power supply is connected to a load, the mains power supply is connected to a battery via a normally open contact KA3 of the relay, and the battery is connected to the load via a normally closed contact KA2 of the relay.

[0007] More preferably, it also includes an AC / DC switching power supply, the input end of the AC / DC switching power supply is connected to the mains, the output end of the AC / DC switching power supply is connected to the load and one end of the normally open contact KA3 of the relay, and the other end of the normally open contact KA3 of the relay is connected to the battery.

[0008] Preferably, an RC circuit is connected in series between the AC power and the coil KA1 of the relay.

[0009] Preferably, a light emitting diode D1 is connected to the mains power.

[0010] More preferably, the AC power is connected to a light-emitting diode circuit, which includes a light-emitting diode D1, a diode D2 and a resistor R, the live wire of the AC power is connected to the anode of the light-emitting diode D1 and the cathode of the diode D2, the cathode of the light-emitting diode D1 and the anode of the diode D2 are connected to one end of the resistor R, and the other end of the resistor R is connected to the neutral wire of the AC power.

[0011] Preferably, the output voltage of the AC / DC switching power supply is consistent with the battery voltage and the load power supply voltage.

[0012] Preferably, the output voltage of the AC / DC switching power supply is 24V.

[0013] Preferably, a circuit breaker QF is provided on the neutral line of the mains power.

[0014] Preferably, a fuse FU is provided between the normally open contact KA3 of the relay and the battery.

[0015] The beneficial effects of the utility model are:

[0016] 1. This device eliminates the traditional UPS and ATS equipment, and is connected to the mains through the coil KA1 of the relay, the mains is connected to the load, the mains is connected to the battery through the normally open contact KA3 of the relay, and the battery is connected to the load through the normally closed contact KA2 of the relay. Automatic switching of the power supply is achieved, with the mains supplying power under normal conditions and the battery supplying power during power outages, thereby ensuring uninterrupted operation of the load equipment. Compared with traditional solutions, the size of the equipment is greatly reduced, which not only significantly saves the cost and placement space of the device, but also is easy to arrange, simplifies the assembly process, greatly improves production efficiency, and has high power supply reliability.

[0017] 2. Under normal conditions, the battery can be charged by the mains, and it can be automatically charged without removing the battery, which is convenient to use. It also prevents the battery from running out of power and prolongs the battery life.

[0018] 3. When the power is off, the battery can directly supply power to the load without the need for voltage conversion. The circuit structure is simpler and the power supply efficiency is higher.

[0019] 4. By setting up a light-emitting diode circuit, users can be accurately provided with instant feedback on the mains power status, so that they can quickly identify and take corresponding measures.

[0020] 5. By setting up the RC circuit, the relay's closing speed is accelerated, thereby improving the circuit's response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection principle of the backup power supply system of the existing energy storage system;

[0022] Figure 2 This is a circuit connection diagram of the utility model.

[0023] 1-relay; 101-coil KA1; 102-normally closed contact KA2; 103-normally open contact KA3, 2-battery; 3-load; 4-AC / DC switching power supply; 5-RC circuit; 6-light-emitting diode circuit; 7-circuit breaker QF; 8-fuse FU. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Multiple" means "two or more".

[0028] Embodiment 1

[0029] Figure 2 Shows a preferred embodiment of the present application ( Figure 1 FIG. 1 shows a circuit connection diagram of a backup power supply device for an energy storage system provided in the first embodiment of the present application. For ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0030] A backup power supply device for an energy storage system includes a relay 1 and a battery 2, wherein the coil KA1101 of the relay 1 is connected to the mains, the mains is connected to a load 3, the mains is connected to the battery 2 via a normally open contact KA3103 of the relay 1, and the battery 2 is connected to the load 3 via a normally closed contact KA2102 of the relay 1.

[0031] In one embodiment, an AC / DC switching power supply 4 is further included, wherein the input end of the AC / DC switching power supply 4 is connected to the mains, the output end of the AC / DC switching power supply 4 is connected to the load 3 and one end of the normally open contact KA3 103 of the relay 1, and the other end of the normally open contact KA3 103 of the relay 1 is connected to the battery 2.

[0032] In one embodiment, an RC circuit 5 is connected in series between the mains and the coil KA1 101 of the relay 1. The specific structure of the RC circuit 5 can be designed and configured according to specific circuit parameters. In this embodiment, the preferred RC circuit 5 is composed of a capacitor and a resistor connected in parallel.

[0033] In one embodiment, a light emitting diode D1 is connected to the mains power.

[0034] In one embodiment, a light emitting diode circuit 6 is connected to the mains. The specific light emitting diode circuit 6 is mainly used to connect the light emitting diode D1 in series with the mains to realize instant feedback of the mains status. Its specific structure can be designed and configured according to specific circuit parameters. The preferred light emitting diode circuit 6 of this embodiment includes a light emitting diode D1, a diode D2 and a resistor R, the live wire of the mains is connected to the anode of the light emitting diode D1 and the cathode of the diode D2, the cathode of the light emitting diode D1 and the anode of the diode D2 are connected to one end of the resistor R, and the other end of the resistor R is connected to the neutral wire of the mains.

[0035] In one embodiment, the output voltage of the AC / DC switching power supply 4 is consistent with the voltage of the battery 2 and the power supply voltage of the load 3. According to the specifications of the battery 2 and the load 3, the AC / DC switching power supply 4 can be configured to output different voltages, such as 5V, 12V, and 24V. It can have only one of the voltage outputs, or it can output 5V, 12V, and 24V voltages at the same time by designing the internal circuit to adapt to different power supply requirements. In this embodiment, a 24V battery specification and load are adopted, the input voltage of the AC / DC switching power supply 4 is 220V, and the output voltage is 24V.

[0036] In one embodiment, a circuit breaker QF 7 is provided on the neutral line of the mains power.

[0037] In one embodiment, a fuse FU8 is provided between the normally open contact KA3 103 of the relay 1 and the battery 2. The fuse FU8 may be in the form of a thermal fuse, an air switch fuse, a magnetic fuse, a circuit breaker fuse, an electronic fuse, etc. The specific structural form may be selected in combination with the setting position, cost, circuit parameters, etc. of the fuse, as long as the fuse function can be realized.

[0038] The working principle of this device is as follows:

[0039] When the circuit breaker QF is closed, the AC / DC switching power supply 4 converts 220V AC power into 24V DC power to supply power to the load 3. At the same time, the coil KA1 101 of the relay 1 is powered by the AC power, and the coil KA1 101 is in the energized state. At this time, the normally open contact KA3 103 is connected, and the normally closed contact KA2 102 is disconnected. The AC / DC switching power supply 4 converts 220V AC power into 24V DC power to charge the battery. The light-emitting diode D1 is on, which indicates that the AC power is in a normal power supply state.

[0040] When the power is off, the mains cannot provide normal power to the coil KA1 101 of relay 1, and the coil KA1 101 loses power. At this time, the normally open contact KA3 103 is disconnected, and the normally closed contact KA2 102 is connected. The battery circuit to the load is connected, and the battery 2 starts to supply power to the load. After the mains power is restored, it switches to the mains power supply.

[0041] In this device, the relay control circuit adopts 220V voltage as the rated control voltage, which can effectively prevent the occurrence of contact virtual connection phenomenon.

[0042] In this device, the relay is connected in series with the RC circuit. When the circuit is closed, the relay coil will generate an electromotive force due to the self-inductance phenomenon to hinder the increase of the current in the coil, thereby extending the pull-in time. After the RC circuit is connected in series, the pull-in time can be shortened. The principle is that at the moment the circuit is closed, the voltage across the capacitor C cannot change suddenly and can be regarded as a short circuit. In this way, a power supply voltage higher than the rated working voltage of the relay coil is added to the coil, thereby accelerating the speed of the current increase in the coil and causing the relay to close quickly. After the power supply is stable, the capacitor C does not work, and the resistor R plays a current limiting role.

[0043] In the device, a light-emitting diode and a common diode are connected in parallel and then in series with a resistor, so that whether the mains power is off can be judged by the lighting and extinguishing of the light-emitting diode.

[0044] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A backup power supply device for an energy storage system, characterized in that: The invention comprises a relay (1) and a storage battery (2), wherein a coil KA1 (101) of the relay (1) is connected to a mains supply, the mains supply is connected to a load (3), the mains supply is connected to the storage battery (2) via a normally open contact KA3 (103) of the relay (1), and the storage battery (2) is connected to the load (3) via a normally closed contact KA2 (102) of the relay (1).

2. The energy storage system backup power supply device according to claim 1, characterized in that: It also comprises an AC / DC switching power supply (4), wherein the input end of the AC / DC switching power supply (4) is connected to the mains, the output end of the AC / DC switching power supply (4) is connected to the load (3) and one end of the normally open contact KA3 (103) of the relay (1), and the other end of the normally open contact KA3 (103) of the relay (1) is connected to the storage battery (2).

3. The energy storage system backup power supply device according to claim 1, characterized in that: An RC circuit (5) is connected in series between the mains power and the coil KA1 (101) of the relay (1).

4. The energy storage system backup power supply device according to claim 1, characterized in that: The mains power is connected to a light emitting diode D1.

5. The energy storage system backup power supply device according to claim 1, characterized in that: The mains is connected to a light emitting diode circuit (6), the light emitting diode circuit (6) comprising a light emitting diode D1, a diode D2 and a resistor R, the live wire of the mains is connected to the anode of the light emitting diode D1 and the cathode of the diode D2, the cathode of the light emitting diode D1 and the anode of the diode D2 are connected to one end of the resistor R, and the other end of the resistor R is connected to the neutral wire of the mains.

6. The energy storage system backup power supply device according to claim 2, characterized in that: The output voltage of the AC / DC switching power supply (4) is consistent with the voltage of the storage battery (2) and the power supply voltage of the load (3).

7. The energy storage system backup power supply device according to claim 2, characterized in that: The output voltage of the AC / DC switching power supply (4) is 24V.

8. The energy storage system backup power supply device according to claim 1, characterized in that: A circuit breaker QF (7) is provided on the neutral line of the mains electricity.

9. The energy storage system backup power supply device according to claim 1, characterized in that: A fuse FU (8) is provided between the normally open contact KA3 (103) of the relay (1) and the storage battery (2).

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