Full Bridge SMPS With High No Load Voltage?

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 at
25+ 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 http://www.northerntool.com/downloads/manuals/164686.pdf for
similar power supply requirements.

Thanks.

.

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