Patent ID: 7462954
Filing Date: 2008-12-09
Classification: H02J

Abstract:
1. A system comprising: a first power feed that distributes a first high DC voltage in a building, wherein said first high DC voltage is in range of about 300 to 600 VDC; a first converter, coupled to said first power feed, that receives said first high DC voltage, and scales said first high DC voltage to a first low DC voltage; a first controller that controls a firing rate of said first converter so that said first low DC voltage is in a range of about 23 to 48 VDC; a second power feed that distributes a second high DC voltage in said building, wherein said second high DC voltage is in a range of about 300 to 600 VDC; a second converter, coupled to said second power feed, that receives said second high DC voltage, and scales said second high DC voltage to a second low DC voltage; a second controller that controls a firing rate of said second converter so that said second low DC voltage is in a range of about 23 to 48 VDC; a bridge that couples said first and second low DC voltages to provide a low DC voltage feed, wherein said low DC voltage feed provides power at a level that is about equal to a sum of (a) power provided by said first converter and (b) power provided by said second converter; and first and second sources for said first and second high DC voltages, respectively, each of said first and second high DC voltage sources comprises a rectifier that receives an AC voltage and converts said AC voltage to a high DC voltage.