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Automatically switching multiple input voltage power supply

  • US 5,001,623 A
  • Filed: 12/22/1989
  • Issued: 03/19/1991
  • Est. Priority Date: 12/22/1989
  • Status: Expired due to Fees
First Claim
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1. An automatically switching DC power supply comprising:

  • an AC input voltage connection;

    a transformer with two primary windings rated for the same AC input voltage and with a secondary winding;

    an overvoltage protection means interconnected with each transformer primary winding and acting to limit the voltage applied to the primary winding to which it is connected;

    a DC rectifier means connected to the transformer secondary and producing a first DC voltage on a first output connection when an AC voltage is applied to the primary windings of the transformer;

    an overvoltage sensor connected to the first output connection and producing an overvoltage signal when the first DC voltage is higher than a predetermined level;

    an undervoltage sensor connected to the first output connection and producing an undervoltage signal when the first DC voltage is lower than a predetermined level;

    relay contact means interconnected with the two transformer primary windings in such a manner that the relay contact means can switch the two primary winding between a condition in which the primary windings are in series across the AC input voltage connection and a condition in which the two primary windings ar in parallel across the AC input voltage connection; and

    relay coil means actuating the relay contact means and interconnected with and receiving signals from the overvoltage sensor and the undervoltage sensor, so that the relay contact means puts the transformer primary windings in parallel when the relay coil means receives an undervoltage signal, and the relay contact means puts the transformer primary windings in series when the relay coil means receives an overvoltage signal.

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