A backup UPS input switch abnormal detection device

An input switch, abnormal detection technology, applied in the direction of power supply testing, circuit breaker testing, etc., can solve problems such as sticking or control failure UPS, loss of backfeed protection function, etc., to improve the performance of backfeed protection, High reliability and low cost effect

Active Publication Date: 2018-02-13
ZHANGZHOU KEHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Back-up UPS needs back-feed protection. When the mains is normal, the input switch is turned on. When the mains fails, the switch is automatically disconnected, and the inverter is placed to feed back to the grid. Currently, it is generally used in UPS The input terminal is connected to a group of relays, which are used to isolate the mains input terminal from the UPS. When the input grid is powered off, the contacts of the UPS control input relay are disconnected to ensure that the output voltage of the inverter will not be fed back to the UPS. input terminal to avoid the risk of electric shock; when the mains is normal, the UPS control input relay contact is closed and enters the normal mains power supply mode. However, this protection technology lacks protection against relay or contactor failure conditions. Once the relay or contactor fails Contactor failure Contact sticking or control failure may cause UPS to lose backfeed protection function

Method used

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  • A backup UPS input switch abnormal detection device
  • A backup UPS input switch abnormal detection device

Examples

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Embodiment 1

[0018] See attached figure 1 , a backup UPS input switch abnormal detection device, including an input module, an input switch, a switching module, an output module, a transformer, DC / AC, a backup battery, a detection unit and a control unit; in this embodiment, the input switch is a double Knife double throw switch RLY1; the input terminal of the input module is connected to the normally open contacts 2 and 5 of the input switch RLY1; the detection unit is connected to the normally closed contacts 3 and 6 of the input switch RLY1; the common terminal contacts 1 and 6 of the input switch RLY1 4. Connect to the switching module; the switching module is respectively connected to the output module and the transformer; the transformer is connected to the AC input terminal of DC / AC, the DC input terminal of DC / AC is connected to the backup battery, the control unit is respectively connected to the output terminal of the detection unit and DC / AC.

[0019] Further, in this embodimen...

Embodiment 2

[0024] See attached figure 2 , a backup UPS input switch abnormality detection device, including an input module, an input switch, a switching module, an output module, a transformer, DC / AC, a storage battery, a detection unit and a control unit; in this embodiment, the input switch is a double pole Double-throw switch RLY1; the input terminal of the input module is connected to the normally open contacts 2 and 5 of an input switch RLY1; the detection unit is connected to the normally closed contacts 3 and 6 of the input switch RLY1; the common terminal contacts 1 and 5 of the input switch RLY1 4. Connect to the switching module; the switching module is respectively connected to the output module and the transformer, the transformer is connected to the AC input terminal of DC / AC, the DC input terminal of DC / AC is connected to the backup battery, the control unit is respectively connected to the output terminal of the detection unit and DC / AC.

[0025] Further, in this embodi...

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PUM

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Abstract

The invention relates to a backup type UPS input switch abnormality detection device, comprising an input module; the input module is connected to a normally open contact of an input switch; a detection unit is connected to a normally closed contact of the input switch, and the common terminal of the input switch The contacts are connected to a switching module, the switching modules are respectively connected to an output module and a transformer, the transformer is connected to an AC input terminal of DC / AC, and the DC input terminal of DC / AC is connected to a backup battery; a control unit is respectively connected to To the output of the input module and to DC / AC. In the present invention, the detection unit detects whether the input switch is faulty when the mains power is cut off; the control unit controls the DC / AC to close after receiving the fault signal of the detection unit when the input switch fails, and ensures that the contacts are stuck when the relay or contactor fails. Under the condition of dead or control failure, it plays the role of backfeed protection to ensure that dangerous voltage will not be fed back to the input terminal, causing the risk of electric shock.

Description

technical field [0001] The invention relates to a backup UPS input switch abnormal detection device. Background technique [0002] Back-up UPS needs back-feed protection. When the mains is normal, the input switch is turned on. When the mains fails, the switch is automatically disconnected, and the inverter is placed to feed back to the power grid. Currently, it is generally used in UPS The input terminal is connected to a group of relays, which are used to isolate the mains input terminal and the UPS. When the input grid is powered off, the contacts of the UPS control input relay are disconnected to ensure that the output voltage of the inverter will not be fed back to the UPS. input terminal to avoid the risk of electric shock; when the mains is normal, the UPS control input relay contacts are closed and enter the normal mains power supply mode. However, this protection technology lacks protection against relay or contactor failure conditions. Once the relay or The contac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/40G01R31/327
Inventor 许勇枝陈阳源毛文涛
Owner ZHANGZHOU KEHUA TECH CO LTD
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