The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1990
Filed:
Aug. 21, 1989
Joseph J Cacciatore, Westmont, IL (US);
Harper-Wyman Company, Lisle, IL (US);
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.