Power supply automatic switching device

Abstract

The utility model discloses an automatic switching device for power supply. The automatic switching device comprises a 24V power supply module, a super capacitor, a bypass circuit, a relay and a wiring terminal strip, a wiring terminal strip with a fuse is added between the 24V power supply module and the input of the super capacitor, the output end of the super capacitor is connected with a normally open contact NO of the relay, the bypass circuit is connected with a normally closed contact NC of the relay, and the wiring terminal strip is connected with a common end COM of the relay. According to the invention, automatic switching of output and protection of input are realized by adding the relay and the fuse on the basis of conventional wiring, temporary service of equipment caused by faults of the super-capacitor module is avoided, the continuity and stability of power supply of the module are greatly improved, and the service life of the super-capacitor module is prolonged. Passenger travel is greatly guaranteed, and the reliability and the use efficiency of the terminal equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit, and in particular to an automatic power supply switching device. Background Art

[0002] With the development of subways, the requirements for equipment power supply stability have also increased. Currently, the equipment used in subway stations has begun to use supercapacitor buffer modules to replace the previous UPS (battery pack). Figure 1 As shown, 220VAC mains power is converted to 24V DC by the AC / DC power module, which then powers the supercapacitor, which then stores energy before supplying power to the load. During normal operation, the supercapacitor output voltage may drop, or even cease to output; or the supercapacitor input may short-circuit or open. In these cases, the load cannot be supplied with normal and stable power, causing equipment failure and requiring maintenance. Abnormal input and output conditions in the supercapacitor buffer module require manual intervention, preventing automatic switching of the power supply circuit in the event of an anomaly, reducing the continuity of the equipment's power supply. Such situations, especially during periods of high passenger flow, can cause equipment suspension, resulting in a passenger backlog and placing significant pressure on the subway's normal operations. Summary of the Invention

[0003] Purpose of the invention: The present invention provides a power supply automatic switching device, which realizes automatic switching of output and protection of input.

[0004] Technical solution: The automatic power supply switching device described in the present invention includes: a 24V power supply module, a supercapacitor, a bypass circuit, a relay and a terminal block; a terminal block with a fuse is added between the 24V power supply module and the supercapacitor input, the output end of the supercapacitor is connected to the normally open contact NO of the relay, the bypass circuit is connected to the normally closed contact NC of the relay, and the terminal block is connected to the common terminal COM of the relay.

[0005] Furthermore, terminal block No. 1 in the terminal block has a fuse in the middle, terminal blocks No. 2, 3, 4, and 5 are interconnected through shorting pieces and connected to the negative pole, terminal blocks No. 6, 7, and 8 are interconnected through shorting pieces and connected to the positive pole, and terminal block No. 9 is a single-piece terminal block with 4 interconnected ports.

[0006] Furthermore, the terminal block provides a DC 24V power supply for all loads in the device.

[0007] Furthermore, the supercapacitor communicates with the host computer through a serial port or an IO switch, and after automatically switching the bypass circuit, reports the supercapacitor status, and performs corresponding maintenance after the operation ends.

[0008] Furthermore, the supercapacitor is a carbon electrode double-layer supercapacitor, a metal oxide electrode supercapacitor or an organic polymer electrode supercapacitor.

[0009] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: the present invention changes the conventional wiring by adding relays and fuses to achieve automatic switching of output and protection of input, avoids temporary service of equipment due to failure of the supercapacitor module, greatly improves the continuity and stability of the module power supply, greatly protects passengers' travel and improves the reliability and utilization efficiency of terminal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a wiring diagram of the prior art.

[0011] Figure 2 This is a schematic structural diagram of the automatic power supply switching device of the present invention. DETAILED DESCRIPTION

[0012] like Figure 2 As shown, an automatic power supply switching device includes: a 24V power module, a supercapacitor, a bypass circuit, a relay and a terminal block; a terminal block with a fuse is added between the 24V power module and the supercapacitor input, the output end of the supercapacitor is connected to the normally open contact NO of the relay, the bypass circuit is connected to the normally closed contact NC of the relay, and the terminal block is connected to the common terminal COM of the relay.

[0013] Terminal block 1 has a fuse in the center; terminal blocks 2, 3, 4, and 5 are interconnected via shorting links and connected to the negative terminal; terminal blocks 6, 7, and 8 are interconnected via shorting links and connected to the positive terminal; and terminal block 9 is a single-piece terminal block with four interconnected ports. This terminal block serves as the connection point for various load power cables and provides 24V DC power to all loads within the device.

[0014] During normal operation, the supercapacitor outputs 24V to the relay, which closes, connecting the COM terminal to the NO contact and disconnecting the COM terminal from the NC contact. At this point, the supercapacitor output provides power to the terminal block.

[0015] When the supercapacitor output voltage is low, there is no output, or it is short-circuited, the relay is disconnected, the COM terminal and the NO contact are disconnected, and the COM terminal and the NC contact are connected. At this time, the 24V power supply module directly supplies power to the load through the terminal block.

[0016] The supercapacitor input terminal is open. When the supercapacitor input point cannot continuously obtain power supply, the supercapacitor cannot continuously charge. At this time, the supercapacitor output will gradually decrease, the relay will be disconnected, the COM terminal and the NO contact will be disconnected, and the COM terminal and the NC contact will be connected. At this time, the 24V power module directly supplies power to the load through the terminal block.

[0017] The supercapacitor input terminal is short-circuited. At this time, the fuse between the 24V power module and the supercapacitor input terminal blows, and the supercapacitor output terminal is open. When the supercapacitor input point cannot continuously obtain power, the supercapacitor cannot continuously charge. At this time, the supercapacitor output will gradually decrease, the relay will be disconnected, the COM terminal and the NO contact will be disconnected, and the COM terminal and the NC contact will be connected. At this time, the 24V power module directly supplies power to the load through the terminal block.

[0018] When replacing a new supercapacitor, it may have been uncharged for a long time and is in a low-voltage state, unable to output normal voltage. The relay disconnects, the COM terminal and the NO contact disconnect, and the COM terminal and the NC contact connect. At this time, the 24V power module directly supplies power to the load through the terminal block. The input terminal of a single supercapacitor is normal and remains charged. When the output reaches the rated value, the relay closes, the COM terminal and the NO contact connect, and the COM terminal and the NC contact disconnect. The supercapacitor output terminal then supplies power to the terminal block.

[0019] The present invention can switch back and forth between the supercapacitor output and the bypass circuit. Since the supercapacitor communicates with the host computer, the supercapacitor status will be reported after automatically switching to the bypass. After receiving the information, the maintenance personnel can carry out corresponding maintenance after the operation ends, which has little impact on the normal operation of the subway.

Claims

1. A power supply automatic switching device, characterized in that: include: 24V power module, supercapacitor, bypass circuit, relay and terminal block; add a terminal block with a fuse between the 24V power module and the supercapacitor input, connect the output of the supercapacitor to the normally open contact NO of the relay, connect the bypass circuit to the normally closed contact NC of the relay, and connect the terminal block to the common terminal COM of the relay.

2. The automatic power supply switching device according to claim 1, characterized in that: Terminal block No. 1 in the terminal block has a fuse in the middle. Terminal blocks No. 2, 3, 4, and 5 are interconnected through shorting pieces and connected to the negative pole. Terminal blocks No. 6, 7, and 8 are interconnected through shorting pieces and connected to the positive pole. Terminal block No. 9 is a single-piece terminal block with 4 interconnected ports.

3. The automatic power supply switching device according to claim 1, wherein: The terminal block provides DC 24V power supply for all loads in the equipment.

4. The automatic power supply switching device according to claim 1, wherein: The supercapacitor communicates with the host computer and reports the supercapacitor status after automatically switching the bypass circuit, so that corresponding maintenance can be carried out after the operation ends.

5. The automatic power supply switching device according to claim 1, wherein: The supercapacitor may be a carbon electrode double layer supercapacitor, a metal oxide electrode supercapacitor or an organic polymer electrode supercapacitor.

Images