Title:
TEMPERATURE CONTROLLING CIRCUIT
Document Type and Number:
Japanese Patent JPS5731012
Kind Code:
A
Abstract:
PURPOSE:To execute a low voltage operation by a simple circuit configuration, by inputting an output of an element whose resistance value is varied by a temperature, to a C-MOS gate, DC-amplifying its output, and providing it to a heater for heating. CONSTITUTION:In case when a thermistor resistance RT is larger than a resistance R1, input voltage of a C-MOS gate G becomes lower than threshold voltage 1/2 VDD, therefore, output voltage of the gate G becomes 1 (VDD), transistors TR1, TR2 turn on, and a heater H current flows. On the other hand, in case when the resistance RT is smaller than the resistance R1, an output of the gate G turns ''0'', and the heater current does not flow. In this way, the heater current is controlled so that the resistance R1 and RT become the same value, and a temperature is kept constant.
Inventors:
CHIBA KAZUHARU
TAKEUCHI MUTSUO
TAKAYAMA YASUO
TAKEUCHI MUTSUO
TAKAYAMA YASUO
Application Number:
JP10587180A
Publication Date:
February 19, 1982
Filing Date:
July 31, 1980
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03L1/04; G05D23/24; (IPC1-7): G05D23/20; H03L1/04