Method and apparatus for detecting the temperature of an environ

Details Method and apparatus for detecting the temperature of an environ Method and apparatus for detecting the temperature of an environ

1994-01-24

1996-10-15

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

Combined with diverse art device

374183, 374170, 34493, G01K 722, G01K 1308, F26B 2110

Patent

active

055648312

ABSTRACT:
A method and apparatus for providing a temperature reading to a micro-computer without the use of a digital to analog converter. An apparatus and method is provided for measuring the temperature of an environment by comparing the current flow through a thermistor with the current flow through a known resistance. In the preferred embodiment, the temperature of the exhaust air stream of a dryer is measured by alternately supplying current through the thermistor disposed in the exhaust air stream and through the known resister to the inverting input of a comparator, a full wave rectified signal is supplied to the non-inverting input of the comparator and the width of the volt pulse produced at the output of the comparators is monitored for determining the temperature of the exhaust air stream.

REFERENCES:
patent: 3643346 (1972-02-01), Lester
patent: 4022170 (1977-05-01), Crall et al.
patent: 4194478 (1980-03-01), Sumiyoshi et al.
patent: 4195415 (1980-04-01), Livings et al.
patent: 4211201 (1980-07-01), Sumiyoshi et al.
patent: 4799176 (1989-01-01), Cacciatore
patent: 4933535 (1990-06-01), Zabinski
patent: 5041800 (1991-08-01), Long et al.

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