Ballast converter with power factor and current crest factor correction
AssigneeDelta Electronics, Inc.
InventorsJinfa Zhang, Chenyang Liu, Fu-Yuan Hsu
Life of this patent
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Abstract
A ballast converter with a power factor and crest factor correction to be connected to an input source for providing an input voltage. The ballast converter includes a rectifier, a power converter, and a valley fill circuit, wherein the power converter recharges the valley fill circuit for energy storage storing energy while the value of the first voltage is larger than a predetermined value, the valley fill circuit provides the first voltage with a supplementary energy while the value of the first voltage is lower than the predetermined value, and the predetermined value is adjustable by the valley fill converter circuit.
Claims18
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.
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;
- 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;
- and
- a set of charge pump capacitors, said charge pump capacitors electrically connected with a high-frequency end of said load and two ends of said power source for providing a high-frequency current circuit between said load and said input voltage, thereby modifying the valley-current waves of said input voltage to improve said power factor of said ballast converter.
The ballast converter according to claim 13, wherein said resonance circuit further comprises:
- a second capacitor electrically connected in series with said load;
- and
- a second inductor having one end electrically connected in parallel with said load and the other end electrically connected with the other end of a primary winding.
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;
- 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;
- and
- a set of charge pump capacitors, said charge pump capacitors electrically connected with a high-frequency end of said load and two ends of said power source for providing a high-frequency current circuit between said load and said input voltage, thereby modifying the valley-current waves of said input voltage to improve said power factor of said ballast converter.
Dependencies are inferred from the claim text.