Optimal Feedback Control of Switch-Mode Power Converters

A new controller-filter structure for a switch-mode power converter is described. The controller produces a minimum-time control signal for step changes in output voltage or in load current by partitioning the state-vector plane for the converter´s output filter with a simple curve. A companion filter estimates the state vector of the power converter by modeling the response of the power converter to the control signal. The controller, abandoning the traditional approach of producing duty cycle using a sawtooth waveform with an adjustable threshold, avoids the performance limitations ordinarily encountered with a linear feedback approach