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:
Sep. 17, 2002
Filed:
Nov. 15, 2000
Applicant:
Inventors:
Mitchell R. Rowlette, Berea, KY (US);
Walter H. Bailey, Johnson City, TN (US);
Mark E. Miller, Versailles, KY (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D 2/300 ;
U.S. Cl.
CPC ...
G05D 2/300 ;
Abstract
A control used in a two stage HVAC system has a power supply from a 24 VAC transformer which is full wave rectified (D D D D ) to create DC voltages for a microcontroller (U ) and relays (K -K ). All of the control information needed for the two stage control system is sent to the control from a room thermostat ( ) having first and second stage cooling signal terminals (Y , Y ) over a single line by connecting a diode between the Y , Y terminals creating separate microprocessor recognizable signals.