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Battery operated thermostat timer with battery charging circuits

  • US 4,177,923 A
  • Filed: 08/14/1978
  • Issued: 12/11/1979
  • Est. Priority Date: 05/25/1977
  • Status: Expired due to Term
First Claim
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1. In a timer controlled space thermostat for switching a circuit connecting remote space conditioning apparatus with a remote A.C. power source, electrically operated timer means for periodically changing the temperature set point of said thermostat, a rechargeable battery for operation of said timer means, charging means for said battery comprising a transformer having a primary winding in said circuit and a secondary winding connected across said battery, current rectifying means connected in series with said secondary winding and said windings being so connected as to be only energized when the thermostat is closed.

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