Patent ID: 8451627
Filing Date: 2013-05-28
Classification: H02M

Abstract:
1. An apparatus for converting alternating current (AC) line power to direct current (DC) power, comprising: a rectifier for receiving a high voltage AC line power input and for outputting a full wave rectified high voltage DC; a voltage-reducing voltage regulating component coupled to the rectifier for receiving the full wave rectified high voltage DC and providing an intermediate voltage DC capped by a preset voltage threshold corresponding to said intermediate voltage DC, wherein the regulating component is operative to supply the intermediate voltage DC by gating the full wave rectified high voltage DC at said preset voltage; and a voltage-reducing switching DC-DC converter directly coupled to the voltage-reducing regulating component for receiving the intermediate voltage DC provided by the voltage-reducing regulating component, the voltage-reducing DC-DC converter configured to step down and smooth out the intermediate voltage DC to a desired high current, low voltage DC output, the voltage-reducing regulating component being coupled between the rectifier and the voltage-reducing DC-DC converter to isolate the full wave rectified high voltage DC from the voltage-reducing DC-DC converter; and wherein the voltage-reducing regulating component comprises a gating component configured to gate the high voltage DC by turning on at a zero crossing level and turning off when the high voltage DC exceeds the preset voltage threshold and remain off after the high voltage DC exceeds the preset voltage threshold and until the next zero crossing level.