| 摘要 |
<p>PURPOSE:To simplify the constitution of a titled circuit and at the same time to display an accurate temperature at all times, by using one temperature sensor to control and display temperature. CONSTITUTION:The signals sent from output terminals R0-R4 of a micro-CPU8 are turned into the reference voltage of a fixed level by resistances 21-24, 11 and 17 to be supplied to a plus terminal of a comparator 2. This reference voltage is compared with the voltage of temperature detectors 9 and 10 supplied to a minus terminal of the comparator 2. Then the output of the comparator 2 is fed to an input terminal D1 of the CPU8, and a compensating constant is calculated and stored. On the other hand, the voltage of a thermistor 4 is applied in the same way to the input terminal D2 of the CPU8 via a comparator 6. Thus a conversion of temperature is carried out and at the same time compensated with a compensating constant. This temperature is stored and then used for display. In such a way, a temperature detecting circuit is simplified. At the same time, an error is eliminated between the temperature controlled and that displayed to always ensure a correct temperature display.</p> |
