A power system includes a first unit block having first resonant circuitry that receives power from a DC bus, a first controlled rectifier that provides a first portion of power to one or more loads at a first voltage level, and a first transformer coupled between the first resonant circuitry and the first controlled rectifier. A second unit block includes second resonant circuitry that receives power from the DC bus, a second controlled rectifier configured to provide a second portion of power to the one or more loads at a second voltage level, and a second transformer coupled between the resonant circuitry and the controlled rectifier. The first and second unit blocks are coupled in series to output a summation waveform.