Patent ID: 6642670
Filing Date: 2003-11-04
Classification: H05B,Y10S

Abstract:
A ballast converter with a power factor and crest factor correction electrically connected to a power source for providing an input voltage comprising:a rectifier electrically connected to said power source for rectifying said input voltage so as to provide a first voltage at a pair of DC supply terminal; a power converter electrically connected to said rectifier for converting said first voltage into a high frequency output voltage so as to provide a load with an electrical energy; and a valley fill circuit electrically connected with an output end of said power converter and said DC supply terminals, wherein said power converter charges said valley fill circuit for storing energy while the value of said first voltage is larger than a predetermined value, said valley fill circuit provides said first voltage with a supplementary energy while the value of said first voltage is lower than said predetermined value, and said predetermined value is adjustable by said valley fill converter circuit, wherein said valley fill circuit comprises: a first inductor having one end electrically connected with said output end of said power converter; a first diode having a anode end electrically connected with the other end of said first inductor; a first energy-storing capacitor having one end electrically connected with a cathode end of said first diode and the other end electrically connected with the ground; and a second diode having a anode end electrically connected with said cathode end of said first diode and cathode end electrically connected with one of said DC supply terminals.