Semi-constant power circuit for use with a thermal radiation sou

Details Semi-constant power circuit for use with a thermal radiation sou Semi-constant power circuit for use with a thermal radiation sou

1997-10-28

2000-02-08

Nguyen, Kiet T.

Radiant energy

Radiant energy generation and sources

2504951, 250504R, H01K 102

Patent

active

06023069&

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.

REFERENCES:
patent: 4839566 (1989-06-01), Herold et al.
patent: 4954718 (1990-09-01), Mattheissen

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