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Regulated a.c. power supply

  • US 4,591,779 A
  • Filed: 08/20/1984
  • Issued: 05/27/1986
  • Est. Priority Date: 08/20/1984
  • Status: Expired due to Fees
First Claim
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1. A regulated a.c. power supply for delivering power at a regulated a.c. output through switching of secondary transformer winding taps in a manner so as to impede switching transients and momentary short circuit currents occurring during the switching process without the loss of any portion of the a.c. sine wave and without incident ill-effects of switching having an auxiliary power supply connected with an unregulated a.c. supply phase and providing regulated power of at least one discrete voltage and polarity, means for filtering noise, RFI and related undesirable and prohibitive equipment manifestations ahead of the output terminals of the subject voltage regulator and means for the protection against hazards incoming with the a.c. power line transients,comprising in combination:

  • a transformer having a primary winding connected with the a.c. supply line and a secondary winding equipped with at least two taps,at least one relay having a coil and at least one single-pole, single-throw, normally-open load contact,a said relay load contact connected across each of said at least two adjacent secondary transformer winding taps,a relay control unit receiving regulated power of at least one discrete voltage and polarity,said relay control unit having means for sensing and monitoring the a.c. supply line voltage for the corresponding energizing of a said relay coil and actuating a said relay load contact individually and in a sequence with another said relay load contact, selectively.

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