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Integrated maintenance bypass switch and method of operation thereof

  • US 5,646,459 A
  • Filed: 11/09/1995
  • Issued: 07/08/1997
  • Est. Priority Date: 11/09/1995
  • Status: Expired due to Fees
First Claim
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1. In a backup power system capable of deriving power from alternate AC primary and DC backup power sources to provide continuous AC power to an AC load and including an inverter/switch module having DC and AC inputs and an AC output, a maintenance bypass switch for decoupling said AC primary and DC backup power sources from said backup power system to allow maintenance to be performed thereon, comprising:

  • a selector switch configured to function in alternate normal, standby bypass and maintenance bypass modes of operation, wherein;

    in said normal mode, said selector switch couples said AC primary power source to said AC input of said inverter/switch module, said DC backup power source to said DC input of said inverter/switch module and said AC output of said inverter/switch module to said AC load,in transitioning from said normal mode to said standby bypass mode, said selector switch decouples an inverter in said inverter/switch module from said DC backup power source when said AC primary power source is functioning,in transitioning from said standby bypass mode to said maintenance bypass mode, said selector switch further couples said AC primary power source directly to said AC load, andin said maintenance bypass mode, said selector switch decouples said AC primary power source from said AC input of said inverter/switch module, said DC backup power source fromsaid DC input of said inverter/switch module and said AC output of said inverter/switch module to said AC load, said maintenance bypass switch providing said continuous AC power to said AC load throughout said transitioning.

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