Integrated circuit proportional integral differential controller - has multiple channels and gives wide range of gain settings

摘要

The PID controller, for application in process control and mechanical control systems, gives good noise suppression and failsafe characteristics. The controller consists of an input summing amplifier to which the input set point and a measure of the system output controlled variable are fed. This is followed by three parallel connected amplifiers, one with a proportional, one with an integral and one with a differential gain characteristic. These are followed by another summing amplifier. These linear amplifiers incorporate gain varying features. In the integration channel, the integration time is determined by an input resistance, and the range is determined by a switchable feedback capacitance.