Design procedure for dimmable electronic transformer

This paper describes a new design methodology for an electronic dimming transformer driving low voltage incandescent lamps. The electronic dimming transformer includes a control circuit, half-bridge inverter and a resonant LCR series filter. The dimming effect is achieved through switching frequency variation. The proposed methodology includes a high-frequency power transformer calculation and prototyping, its parameters measuring and using an iteration numeric optimization procedure. The procedure is performed in MATLAB and permits to conclude the resonant filter optimization in few runs. A three-channels dimming electronic transformer is built and tested. The obtained results confirm the effectiveness of the proposed design methodology.