A power supply having a transformer-coupled power converter cascaded with a buck power converter. The transformer-coupled power converter operates in a free-running mode at a nearly 100% maximum duty cycle to convert an input voltage to an intermediate voltage. The buck power converter produces a regulated...http://www.google.ca/patents/US6246592?utm_source=gb-gplus-sharePatent US6246592 - Unique power supply architecture with cascaded converters for large input-to-output step-down ratio
