| 摘要 |
PURPOSE:To take out detection temperature as an absolute value regardless of a set temperature by using an oscillator changing a cycle by a variation of resistance value of a temperature sensor. CONSTITUTION:The oscillator R/tau is set to a body of rotation and is supplied with a power source from a rotary transformer RT1 and oscillation frequency is decided by the resistance value of the temperature sensor Pt. Then, an output signal of the oscillator R/tau is transmitted to the rotary transformer RT2 but the waveform becomes dull by inductance of the transformer RT2 and the signal is inputted to a counter/latch circuit 22 via a waveform shaping circuit 21. Then, one cycle of the oscillator R/tau is counted and latched. Then, during a period of one cycle latched, the oscillation frequency inputted from an oscillator OSC23 is counted. Consequently, the detection temperature of the sensor Pt is converted into count value of a pulse by the circuit 22 and then outputted from a D/A conversion circuit 24. Thus, since the oscillator changing the cycle by the variation of the resistance value of the sensor is used, the detection temperature can be taken out as the absolute value regardless of the prescribed temperature and the precision of the temperature detection is improved. |
