Digital Controlled High Frequency Switching Mode Power System

Design of a dc-dc converter operating at the frequency of MHz is presented. Digital control algorithm is implemented in FPGA and a high resolution PWM pulse generator is built based on the combination of fast clock counter and programmable delay line techniques. The output voltage of this converter is regulated using a phase-shifted PWM scheme. Planar topology for the transformer was adopted and the windings were fabricated by using the printed circuit board. The ability to control the electromagnetic interference of the SMPS was tested and proved to work well.