Title :
A digitally programmable temperature controller based on phase-lock loop
Author :
Mohamed, O.I. ; Shoji, Sergio ; Watanabe, Kenzo
Author_Institution :
Res. Inst. of Electron., Shizuoka Univ., Hamamatsu, Japan
Abstract :
A digitally programmable temperature controller based on the phase-lock loop is described. The temperature is sensed in frequency form and compared with the reference frequency corresponding to the target temperature in a phase detector in order to derive the actuator. The frequency difference is also detected by a one-chip microcomputer which changes the reference frequency according to the proportional-integral-derivative operation. A prototype controller achieved 0.1°C accuracy in temperature control of a water bath
Keywords :
computerised control; digital control; phase-locked loops; programmable controllers; temperature control; H2O; computerised control; digitally programmable temperature controller; one-chip microcomputer; phase-lock loop; proportional-integral-derivative operation; prototype controller; reference frequency; Actuators; Digital control; Frequency conversion; Intelligent sensors; Microcomputers; Phase detection; Phase frequency detector; Phase locked loops; Temperature control; Temperature sensors;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1988. IMTC-88. Conference Record., 5th IEEE
Conference_Location :
San Diego, CA
DOI :
10.1109/IMTC.1988.10842
