A power converter capable of receiving either an AC input voltage or a DC input voltage and generating a programmable DC output voltage. The converter comprises a first circuit that converts an AC input voltage to a predetermined DC first output voltage, and a second circuit that converts a DC input...http://www.google.co.uk/patents/US6775163?utm_source=gb-gplus-sharePatent US6775163 - Dual input AC/DC to programmable DC output converter
