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A back-up type UPS input switch abnormity detection apparatus

An input switch and anomaly detection technology, applied in 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, The effect of high reliability and simple control device

Active Publication Date: 2016-01-20
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 back-up type UPS input switch abnormity detection apparatus
  • A back-up type UPS input switch abnormity detection apparatus

Examples

Experimental program
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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 back-up type UPS input switch abnormity detection apparatus 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 an input switch. A common end terminal of the input switch is connected to a switching module which is further separately connected to an output module and a voltage transformer. The voltage transformer is connected to an AC input terminal of a DC / AC. A direct current input terminal of the DC / AC is connected to a back-up storage battery. A control unit is separately connected to an output terminal of the input module and the DC / AC. According to the invention, the detection unit detects whether faults occur to the input switch when a commercial power supply is cut off; in a condition that the faults occur to the input switch, the control unit controls the DC / AC to turn off after receiving fault-signals of the detection unit; in a condition that failure contacts of a relay or a contactor are bonded or control fails, an effect of reverse electricity feeding protection is realized; and dangerous voltages are absolutely prevented from being fed back to the input ends, thereby avoiding dangers 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 Applications(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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