Control System for a Pulsed Current Source based on Digital Hysteresis and Current Estimation

PENOVI, E.; MAESTRI, S.; GARCIA RETEGUI, R.A.; WASSINGER, N.; BENEDETTI, MARIO

IEEE LATIN AMERICA TRANSACTIONS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Año: 2014 vol. 12 p. 1214 - 1220

1548-0992

This work presents the implementation of a control system for a high-precision pulsed current source. The proposed control scheme employsa digital hysteresis to achieve a well-defined precision and a high dynamic response. The existence of measurement noise, comparable with the amplitude of the hysteresis bands, generates unwanted commutations that tend to increase the power losses in the semiconductors and to reduce overall system efficiency. As a solution, a current estimation algorithm is proposed. This estimator incorporates the semiconductors state information to improve the filtering capability without affecting the measurement dynamics. Experimental results validate the proposed control scheme.