HEATER TEMPERATURE CONTROL CIRCUIT AND SENSOR DEVICE USING SAME

WIPO Patent Application WO/2019/107446

A1

The purpose of the present invention is to provide a heater temperature control circuit that can control a heater temperature with higher accuracy than before and a sensor device using the same. The present invention is a heater temperature control circuit (10) having a heater (6) and a control circuit for controlling the temperature of the heater and is characterized in that: the control circuit includes a bridge circuit (11), in which a first circuit (11c) and a second circuit (11d) are connected in parallel, and an operational amplifier (12) connected to the bridge circuit; the heater and a resistor are connected in series in the first circuit; the midpoint of the first circuit is connected to one input section of the operational amplifier (12); and an output value Vout obtained by multiplying a reference voltage Vref of the bridge circuit by the voltage division ratio between a target resistance value Rh of the heater and the resistance value R1 of the resistor is input from the second circuit to the other two input sections of the operational amplifier.

UEDA TOSHITSUGU (JP)
OIGAWA HIROSHI (JP)
OHASHI MITSUO (JP)
SHIMOJIMA MIZUHO (JP)
YANO TAKAAKI (JP)

PCT/JP2018/043863

June 06, 2019

November 28, 2018

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KOA CORP (JP)

H05B3/00; G05D23/19; G05F1/10

JP2012251975A	2012-12-20
JP2015125033A	2015-07-06
JP2007245489A	2007-09-27
JP2017054340A	2017-03-16
JP2013088918A	2013-05-13

AOKI, Hiroyoshi et al. (JP)

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