Electronic digital thermostat having an improved power supply

Details Electronic digital thermostat having an improved power supply Electronic digital thermostat having an improved power supply

1989-08-21

1990-08-14

Wayner, William E.

Automatic temperature and humidity regulation

With timing element

Timer other than clock

165 12, F23N 520

Patent

active

049480448

ABSTRACT:
An improved power supply circuit is provided for use with programmable electronic digital thermostats of the type including a controlled semiconductor switch connected in series with an external alternating current (AC) voltage source. The power supply circuit includes a first rectifier bridge coupled across the controlled semiconductor switch for rectifying the external AC voltage to produce a first direct current voltage. A transformer has a primary winding and a secondary winding. The primary winding is connected in series with the controlled semiconductor switch and the external AC voltage source. A second rectifier bridge is connected across the secondary winding for rectifying the alternating current to produce a second direct current voltage. A voltage regulator has an input coupled to the first and second rectifier bridges and an output for providing a predetermined supply voltage for the programmable electronic digital thermostat.

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