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:
Feb. 08, 2000
Filed:
Oct. 28, 1997
Gregory Steinthal, Santa Barbara, CA (US);
Andrian Kouznetsov, Santa Barbara, CA (US);
Engelhard Sensor Technologies, Inc., Iselin, NJ (US);
Abstract
A power circuit for use with a resistive thermal radiation source in which the power delivered to the resistive thermal radiation source will remain constant within a preselected deviation over a fixed period of time as the source resistance of the source varies between an initial source resistance and a second source resistance at the operating temperature. The power circuit is designed to maintain constant power within a preselected deviation by using the resistance of the resistive thermal radiation source to calculate a preselected resistance used in the power circuit according to the following equation: ##EQU1## wherein .DELTA.P=P.sub.si -P.sub.s ; P.sub.si =the initial power on the resistive thermal radiation source; P.sub.s =the power on the resistive thermal radiation source when the source resistance is equal to the second source resistance; K.sub.1 =RO/R.sub.si ; R0=the preselected resistance; R.sub.si =the initial source resistance; K.sub.2 =R.sub.s /R.sub.si ; and R.sub.s =the second source resistance.