| 摘要 |
PURPOSE:To always obtain a temperature input value with a high accuracy by providing a circuit selector switch which connects a temperature sensor and a resistor for a temperature reference selectively to a resistance/voltage converter circuit and by connecting the resistor for the temperature reference selectively to the resistance/ voltage converter circuit at the time of a calibration mode. CONSTITUTION:A temperature input circuit of a control device for refrigerating air- conditioning is equipped with a calibration value calculating means which compares digital data of a resistor 8 for a temperature reference obtained through conversion by an A/D converter 5 with digital data on a theoretical resistance value of the resistor 8 stored in a storage means beforehand and computes a calibration value, and with a temperature input value computing means which corrects digital data on a resistance value of a temperature sensor 9 obtained through conversion by the A/D converter 5, by the aforesaid calibration value, and computes a temperature input value. Moreover, a circuit selector switch 11 which connects the temperature sensor 9 and the resistor 8 for the temperature reference selectively to a resistance/voltage converter circuit 6 is provided. According to this constitution, the temperature input value of high accuracy can be obtained.
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