Controller for closed loop control of a dcx converter and method therefor

Abstract

A controller for a DCX power converter includes an SR controller that controls conduction times of first and second SR transistors in response to respective conduction conditions thereof, and a primary side controller that provides first and second primary phase signals controlling first and second transistors, measures a first sense signal as a time between a gate voltage of the first SR transistor falling below a first threshold and an activation of the second primary phase signal, an adaptive dead time proportional to an average of current conducted in the SR transistors during their respective active times, a first reference signal as a predetermined delay time plus the adaptive dead time, and a first error signal as an average difference between the first sense signal and the first reference signal, and controls a switching speed of the first and second primary phase signals to reduce the first error signal.