Performance characterization of a new discrete pulse modulated current regulator

A discrete pulse-modulated current regulator which controls a space (d-q) vector that describes the load current is introduced. The controller uses no additional state feedback and results in better performance than the current-regulated delta modulator (CR Delta M). This novel discrete-time regulator, which switches between adjacent switching vectors and the zero state based on the CR Delta M state, contains most of the operating characteristics of the optimum regulator. Simulation results of the proposed regulator are compared to the CR Delta M and the optimum discrete time current regulator. The same ideas used in the discrete pulse case can be extended to form a hard-switched hysteresis-type current regulator. In either case, the regulator is easily implemented, requiring no calculation of counter-EMF (electromotive force) or Delta I. In addition, a modified sigma-delta modulated voltage regulator is derived which satisfies the pulse polarity consistency rule. Finally, complete experimental results are given.<>