US Patent 7190090 Redundant power distribution system

A redundant power distribution system (74) that has multiple distribution lines (168) and (174) includes multiple regulators (122). Multiple isolation transformers (124) are coupled to the regulators (122) and have isolation boundaries (261). A redundant regulator device circuit (152) is coupled to the isolation transformers (124) to regulate the multiple distribution lines where M (integer) out of N (integer) distribution lines are required so that the system continues to operate properly. The regulators (122) and the isolation transformers (124) have a non-feedback looped configuration (259) across the isolation boundaries (261).