Temperature controller has 'take-back-half' convergence algorithm

摘要

"The unfortunate relationship between servo systems and oscillators is very apparent in thermal-control systems," says Linear Technology's Jim Williams (Reference 1). Although high-performance temperature control looks simple in theory, it proves to be anything but simple in practice. Over the years, designers have devised a long laundry list of feedback techniques and control strategies to tame the dynamic-stability gremlins that inhabit temperature-control servo loops. Many of these designs integrate the temperature-control error term T_S—T in an attempt to force the control-loop error to converge toward zero (Reference 2).