In my attempt to build an inverter-style plasma cutter, I have run into a problem. How can a full bridge SMPS create a high (270 VDC) near open circuit voltage, but have a relatively low load voltage (90 vdc at25+ amps)? The high voltage is used to start the arc, and the lower voltage is used to maintain the arc. I'm planning to use a CCM PFC with an output of 220 vdc into a full bridge (current mode, fs=25khz). See for similar power supply requirements.