Adaptive control of a high-frequency DC-DC converter by parameter scheduling

Two digitally implemented control strategies are described for the full-bridge, phase-shift controlled DC-DC converter with an active clamp. The controller parameters are adjusted on-line according to a pre-defined schedule in order to obtain invariant transient behaviour across the converter operating range. The scheduling regime is determined from a sampled-data small-signal model of the converter. Practical results are included for a 2.5kW, 50kHz system employing a TMS320C3 1 digital signal processor as the controller.