Title :
A feedback I2-controlled constant temperature solar radiation meter
Author :
Oliveira, A. ; Deep, G.S. ; Lima, A.M.N. ; Freire, R.C.S.
Author_Institution :
UFBA-EP-DEE, Campina Grande, Brazil
Abstract :
The conventional thermoresistive sensor-based feedback constant temperature circuit have shown some performance limitations due to the input offset voltage of the amplifier. The d.c. analysis of this circuit has been presented to graphically demonstrate these limitations. Alternative feedback measurement scheme without employing the Wheatstone bridge is proposed. PI and predictive controller designs are described. Simulation results for these controllers and a practical configuration are presented
Keywords :
bridge circuits; circuit feedback; physical instrumentation control; predictive control; radiometers; resistance thermometers; two-term control; DC analysis; PI controller design; PWM current excitation; amplifier input offset voltage; bridge circuit; constant temperature solar radiation meter; feedback I2-controlled; feedback measurement scheme; performance limitations; predictive controller design; static analysis; thermoresistive sensor-based; Ash; Capacitive sensors; Circuits; Electrical resistance measurement; Equations; Feedback; Solar radiation; Temperature sensors; Thermal sensors; Voltage;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1998. IMTC/98. Conference Proceedings. IEEE
Conference_Location :
St. Paul, MN
Print_ISBN :
0-7803-4797-8
DOI :
10.1109/IMTC.1998.676886
