Patent ID: 6933626
Filing Date: 2005-08-23
Classification: H02J,H02M

Abstract:
1. An Uninterruptible Power Supply (UPS) for a communications signal distribution system that distributes a communications signal and Alternating Current (AC) power over a coaxial cable having a conductor and a sheath, the UPS comprising: an input neutral line; an input voltage line; a first circuit that is configured to convert an input voltage between the input neutral line and the input voltage line into first and second complementary Direct Current (DC) voltages, wherein the input voltage is an AC input voltage between the input neutral line and the input voltage line, and the first circuit comprises a battery and a third circuit that is configured to convert the AC input voltage between the input neutral line and the input voltage line into the first and second complementary DC voltage and to supply the first and second complementary DC voltage to the battery; and a second circuit that is configured to convert the first and second complementary DC voltages into an AC voltage between an output neutral line and an output voltage line and to connect the output neutral line to a coaxial cable sheath and the output voltage line to a coaxial cable conductor, the first and second circuits further being configured to connect the input neutral line to the output neutral line without an intervening transformer winding, wherein the second circuit comprises a DC-to-DC converter that is configured to convert the first and second complementary DC voltages into third and fourth complementary DC voltages; and an inverter that is responsive to the third and fourth complementary DC voltages and is configured to convert the third and fourth complementary DC voltages into the AC voltage between an output neutral line and an output voltage line.