Temperature control apparatus

U.S. Patent Number: 5381954

Abstract: A temperature control apparatus and method which utilizes a characteristic of a temperature detection device which detects temperature over a wide range of changing temperature and makes it possible to control a unit by detecting a wide range of changing temperature of the unit using the single temperature detection device. A temperature detection circuit outputs a voltage corresponding to the resistance value of the temperature detection device, whose resistance value varies with changes in temperature, which voltage is A/D (analog-to-digital) converted into a digital step value. This digital step value is converted to a temperature value using a predetermined mathematical relationship. The temperature control is executed using the converted temperature value and a desired temperature value in the same data form as the converted temperature value.

Inventors: Tokizaki; Hisashi (Ora, JP)

Assignee: Sanyo Electric Co., Ltd. (Moriguchi, JP)

Application Number: 08/122,644

Issued: 1995-01-17

Expired: 2007-01-17

Classes: 236/78D ; 165/259; 374/171; 700/276; 700/299; 702/133

Field of search: 374/183,170,171 165/26 236/1R,78D,91G 364/557

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