Patent ID: 9618395
Date: 2017-04-11
CPC Classifications: G01K

Claim:
1. A temperature detecting circuit comprising: a first thermistor that has a resistance Ra; a second thermistor that has a resistance Rb; a first pull-up resistor that is connected between the first thermistor and a power supply, the first pull-up resistor having a resistance Rc; a second pull-up resistor that is connected between the second thermistor and the power supply, the second pull-up resistor having a resistance Rd; and a controller comprising circuitry configured to sense a temperature based on a voltage signal from the first thermistor if a temperature corresponding to a voltage signal from one of the first thermistor and the second thermistor is below a threshold temperature, the circuitry being configured to sense a temperature based on a voltage signal from the second thermistor if a temperature corresponding to a voltage signal from one of the first thermistor and the second thermistor is higher than or equal to the threshold temperature, the resistances Ra, Rb, Rc and Rd having a relationship expressed by Ra<Rb and Rc>Rd, wherein the controller includes