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UPS with input commutation between AC and DC sources of power

  • US 5,241,217 A
  • Filed: 11/07/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 11/07/1991
  • Status: Expired due to Fees
First Claim
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1. An uninterruptible power supply, said power supply comprising:

  • AC input terminal means for receiving a first AC voltage from an AC power source;

    DC input terminal means for receiving a first DC voltage from a DC power source;

    AC output terminal means for connecting to a load;

    converter means for converting said first AC voltage to a second DC voltage across electrical charge storage means coupled to said converter means, said second DC voltage being larger than the maximum peak voltage of said first AC voltage and said first DC voltage;

    switching means coupled to said AC power source and said DC power source for selectively connecting said AC power source or said DC power source to said converter means;

    inverter means coupled to said electrical charge storage means for receiving said second DC voltage and inverting said second DC voltage to a second AC voltage, said second AC voltage being coupled to said AC output terminal means; and

    control means coupled to said switching means for controlling the operation of said switching means, said control means operating said switching means to connect said AC power source to said converter means only when said first AC voltage is within a predetermined range and operating to connect said DC power source to said converter means when said first AC voltage is outside of said range.

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