PURPOSE: To detect temperature easily by obtaining a linear relation between thermistor temperature and time from the charging start of a capacitor.
CONSTITUTION: The capacitor 3 and a resistance 4 are connected across a DC power source in series and the parallel circuit of a thermistor 7 and a resistance, and a resistace 8 are connected across the DC power source in series. The potential V1 at the connection point between the capacitor 3 and resistance 4 and the potential V2 at the connection point between the thermistor 7 and resistance 8 are supplied to and compared with each other by a comparator 10. The time from the charge starting point of the capacitor 3 to the inversion of the comparator 10 is counted by a microcomputer 11. The temperature of the thermistor 7 and the inversion time of the comparator 10 have the linear relation in a specific temperature range.
NAKAKUKI JIYUNICHI
TERAI HARUO
NAKAMOTO SHIGEHARU
| JPS5443080A | 1979-04-05 |