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Power supply apparatus with a back-up power unit

  • US 5,612,581 A
  • Filed: 11/01/1995
  • Issued: 03/18/1997
  • Est. Priority Date: 01/18/1995
  • Status: Expired due to Term
First Claim
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1. A power supply apparatus with a back-up power unit comprising:

  • a plurality of AC-DC conversion means each connected in parallel to an AC power source, and each converting an AC voltage of said power source to a high DC voltage;

    a plurality of DC-DC conversion means each connected to an output of each AC-DC conversion means, each converting the high DC voltage to a low DC voltage to be supplied to a load, and each output thereof connected in parallel to said load; and

    a back-up power means connected in parallel to the output of each AC-DC conversion means through a first and a second diode in order to supply the high DC voltage to the DC-DC conversion means when a failure occurs in said AC power source;

    wherein the first diode is connected between a positive line of the AC-DC conversion means and a positive side of the back-up means in accordance with a connection direction in which the cathode of the first diode is connected to the positive line and the anode thereof is connected to the positive side, and the second diode is connected between a negative line of the AC-DC conversion means and a negative side of the back-up means in accordance with a connection direction in which the anode of the second diode is connected to the negative line and the cathode thereof is connected to the negative side.

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