Adaptive current controller for static converter drive - has three differential amplifiers, with path through middle amplifier controlled by switches (NL 9.4.80)

摘要

The controller has a switch for control of the control parameters in accordance with the current control variable and a response threshold. The different between the current reference input and current control variable is applied to an amplifier. The above difference from a first amplifier (1) is applied to the noninverting input of a second amplifier (2), and through a third inverting amplifier (3) to the inverting input of the second amplifier (2). The latter has a PI behaviour for the signal at its noninverting input. Switches (4, 5) open the signal path to the second amplifier (2) inverting input only when the current level is below the response threshold.