An implementation of current-mode control for a series-resonant DC-DC converter

A new implementation of the (average) current mode control for a series resonant converter operated in the frequency range higher than the circuit resonant frequency will be introduced. The controller design is based on the ASDTIC (Analog-Signal-to-Discrete-Time- Interval Converter) concept but has some improvements over the original design which often suffered from static and dynamic instabilities. Some experimental results of a breadboarded converter with this new controller will be presented and the near-optimum fast response characteristics of the combination of this controller and the load current feedforward will be included to show the similarity between the current-mode controller for switching-mode converters and series-resonant converters.