AC dual power supply switching device

Abstract

The utility model discloses an alternating current dual power switching device belongs to electric power switching technical field. An alternating current dual power switching device, including main power supply and secondary power supply still includes: first voltage mutual inductor, first voltage mutual inductor with the output of main power supply electric connection, second voltage mutual inductor, second voltage mutual inductor with the output of secondary power supply electric connection, the output of second voltage mutual inductor and first voltage mutual inductor all electric connection has check module, the output of check module respectively electric signal connection has first solid state relay and second solid state relay, the output of first solid state relay with second solid state relay electric connection has equipment.

Description

Technical Field

[0001] This utility model relates to the field of power switching technology, and in particular to an AC dual power supply switching device. Background Technology

[0002] Electricity is indispensable in people's daily lives, especially in important sectors that require continuous power supply, such as postal and telecommunications, banks, hospitals, fire stations, high-rise buildings, industrial production lines, and television stations. If the power grid fails to supply power in a timely manner, it will cause huge economic losses and safety hazards. Therefore, adding a backup power supply to the load circuit as an emergency power source is necessary to ensure the continuous and reliable operation of important loads.

[0003] Currently, existing dual AC power supply switching mainly uses relay switches. However, traditional relays may generate electric arcs during AC dual power supply switching due to the instantaneous opening or closing of mechanical contacts, leading to contact wear, electromagnetic interference (EMI), and even fire risks. This is especially true during load switching, where the arc energy is greater, making the safety hazard more significant. Therefore, to address this problem, this invention proposes an AC dual power supply switching device. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the prior art by proposing an AC dual power supply switching device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an AC dual power supply switching device, including a main power supply and a secondary power supply, further comprising: a first voltage transformer, the first voltage transformer being electrically connected to the output terminal of the main power supply; a second voltage transformer, the second voltage transformer being electrically connected to the output terminal of the secondary power supply, the output terminals of the second voltage transformer and the first voltage transformer being electrically connected to a testing module, the output terminals of the testing module being electrically connected to a first solid-state relay and a second solid-state relay respectively, and the output terminals of the first solid-state relay and the second solid-state relay being electrically connected to a device.

[0006] Preferably, the input terminal of the inspection module is electrically connected to a power supply component, which is used to supply power to the inspection module.

[0007] Preferably, the power supply component includes a DC power supply and a step-down module, wherein the DC power supply is electrically connected to the input terminal of the step-down module, and the step-down module is electrically connected to the input terminal of the inspection module.

[0008] Preferably, the inspection module includes a processing chip and a relay driving module. The processing chip is electrically connected to the first voltage transformer and the second voltage transformer, and the relay driving module is electrically connected to the output terminal of the processing chip.

[0009] Preferably, both the second voltage transformer and the inspection module include a current-type voltage transformer, which converts the input voltage signals from the main power supply and the secondary power supply into pulse signals for the inspection module.

[0010] Preferably, the relay driver module is an LM293 chip.

[0011] Compared with the prior art, this utility model provides an AC dual power supply switching device with the following advantages: This AC dual power supply switching device, through the cooperation of a first voltage transformer, a second voltage transformer, and a testing module between a first solid-state relay and a second solid-state relay, can eliminate traditional mechanical contacts and electric arcs. Through this setting, fully automatic power switching without mechanical contacts is achieved, avoiding the problems of electric arcs and sparks that may be generated by traditional relays, leading to contact wear, electromagnetic interference (EMI), and even fire risks, and further improving the response efficiency and safety of the switching device. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an AC dual power supply switching device proposed in this utility model; Figure 2 This is a schematic diagram of the system structure of an AC dual power supply switching device proposed in this utility model; Figure 3 This is a schematic diagram of the inspection module structure of an AC dual power supply switching device proposed in this utility model; Figure 4 The circuit diagram of the step-down module of the AC dual power supply switching device proposed in this utility model is shown.

[0013] In the diagram: 1. Main power supply; 2. Secondary power supply; 3. First voltage transformer; 4. Second voltage transformer; 5. Inspection module; 51. Processing chip; 52. Relay drive module; 6. First solid-state relay; 7. Second solid-state relay; 8. Equipment; 9. Power supply components; 91. DC power supply; 92. Step-down module. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] Example 1: Reference Figures 1-4 An AC dual power supply switching device includes a main power supply 1 and a secondary power supply 2, and further includes: a first voltage transformer 3 electrically connected to the output terminal of the main power supply 1; a second voltage transformer 4 electrically connected to the output terminal of the secondary power supply 2; both the output terminals of the second voltage transformer 4 and the first voltage transformer 3 are electrically connected to a test module 5; the output terminals of the test module 5 are electrically connected to a first solid-state relay 6 and a second solid-state relay 7, respectively; the output terminals of the first solid-state relay 6 and the second solid-state relay 7 are electrically connected to a device 8; the test module 5 includes a processing chip 51 and a relay driver module 52; the processing chip 51 is electrically connected to the first voltage transformer 3 and the second voltage transformer 4; the relay driver module 52 is electrically connected to the output terminal of the processing chip 51; both the second voltage transformer 4 and the test module 5 include current-type voltage transformers, which convert the input voltage signals from the main power supply 1 and the secondary power supply 2 into pulse signals for the test module 5; the relay driver module 52 is an LM293 chip.

[0017] In this invention, when the main power supply circuit 1 is detected to be energized, regardless of whether the secondary power supply circuit 2 is energized or not, the main power supply circuit 1 is preferentially switched to the power supply line. The inspection module 5 controls the first solid-state relay 6 to close the switch, thereby supplying power to the equipment 8 from the main power supply. Only when the main power supply circuit 1 is de-energized is the power supply switched to the secondary power supply circuit 2. The first voltage transformer 3 converts the main power supply 1 voltage signal into a rated pulse signal, which is then transmitted to the inspection module 5 to determine the presence or absence of voltage in each phase. After the last pulse of a certain circuit appears, there is a 20ms interval after which no further pulses appear. If the main power supply 1 circuit fails, the closing switch of the first solid-state relay 6 is first disconnected, and after a 20ms interval, the closing switch of the second solid-state relay 7 on the secondary power supply 2 is driven to close, so that the secondary power supply 2 can be used to supply power to the device 8. If the secondary power supply 2 fails, no change is needed. When the inspection module 5 detects the signal of the secondary power supply 2 circuit, after the main power supply 1 circuit signal is present, the closing switch of the second solid-state relay 7 on the secondary power supply 2 circuit is first disconnected, and after a 20ms interval, the closing switch of the first solid-state relay 6 on the main power supply 1 circuit is closed. The processing chip 51 can monitor the voltage values ​​of the first voltage transformer 3 and the second voltage transformer 4 in real time. The processing chip 51 prioritizes monitoring the voltage status of the first voltage transformer 3. When the first voltage transformer 3 is abnormal, the processing chip 51 will send a command to the relay drive module 52. The relay drive module 52 will then switch between the first solid-state relay 6 and the second solid-state relay 7, thereby turning off the first solid-state relay 6 and turning on the second solid-state relay 7, thus supplying power to the secondary power supply 2. The input voltage signals from the main power supply 1 and the secondary power supply 2 are converted into pulse signals and sent to the inspection module 5 through the current-type voltage transformer.

[0018] Example 2: Reference Figures 1-3 Similar to Embodiment 1, but further: the input terminal of the inspection module 5 is electrically connected to a power supply component 9, which is used to supply power to the inspection module 5. The power supply component 9 includes a DC power supply 91 and a step-down module 92. The DC power supply 91 is electrically connected to the input terminal of the step-down module 92, and the step-down module 92 is electrically connected to the input terminal of the inspection module 5.

[0019] With the power supply component 9 configured, power output can be provided to the inspection module 5 independently, thereby ensuring that the power supply component 9 can work continuously. Power is supplied by DC power supply 91, and then the DC power is converted into a constant voltage reference current by step-down module 92 to power the processing chip 51, thereby ensuring that the processing chip 51 can work continuously. This avoids the situation where the main power supply 1 and the secondary power supply 2 are both without power, which would prevent the inspection module 5 from being unable to work.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An AC dual-power switching device, comprising a main power supply (1) and a secondary power supply (2), characterized in that, The AC dual power supply switching device further includes a first voltage transformer (3) and a second voltage transformer (4). The first voltage transformer (3) is electrically connected to the output terminal of the main power supply (1). The second voltage transformer (4) is electrically connected to the output terminal of the secondary power supply (2). The output terminals of the second voltage transformer (4) and the first voltage transformer (3) are both electrically connected to a test module (5). The output terminals of the test module (5) are respectively electrically connected to a first solid-state relay (6) and a second solid-state relay (7). The output terminals of the first solid-state relay (6) and the second solid-state relay (7) are electrically connected to a device (8).

2. An AC dual power supply switching device according to claim 1, characterized in that, The input terminal of the inspection module (5) is electrically connected to a power supply component (9), which is used to supply power to the inspection module (5).

3. An AC dual power supply switching device according to claim 2, characterized in that The power supply component (9) includes a DC power supply (91) and a step-down module (92). The DC power supply (91) is electrically connected to the input terminal of the step-down module (92), and the step-down module (92) is electrically connected to the input terminal of the inspection module (5).

4. An AC dual power supply switching device according to claim 1, characterized in that, The inspection module (5) includes a processing chip (51) and a relay drive module (52). The processing chip (51) is electrically connected to the first voltage transformer (3) and the second voltage transformer (4). The relay drive module (52) is electrically connected to the output terminal of the processing chip (51).

5. An AC dual power supply switching device according to claim 1, wherein The second voltage transformer (4) and the inspection module (5) both include a current-type voltage transformer, which converts the input voltage signals in the main power supply (1) and the secondary power supply (2) into pulse signals for the inspection module (5).

6. An AC dual power supply switching device according to claim 4, wherein The relay driver module (52) is an LM293 chip.

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