Power feedback power factor correction high frequency inverter

• US 20050146906A1
• Filed: 12/29/2003
• Published: 07/07/2005
• Est. Priority Date: 12/29/2003
• Status: Active Grant

• Current Assignee: Yih-Fang Chiou
• Original Assignee: Yih-Fang Chiou
• Inventors: Zhang, Kanghong, Chiou, Yih-Fang, Chao, James Chien Fan
• Granted Patent: US 7,023,148 B2
• Time in Patent Office: Days
• US Class Current: 363/97
• CPC Class Codes: H02M 1/425 using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
• CPC Class Codes: H05B 41/28 using static converters
• CPC Class Codes: H05B 41/282 with semiconductor devices H05B41/2806, H05B41/288, H05B41/295 take precedence
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An electronic high frequency supply, such as lamp ballast, includes a double rectifier, two storage Capacitors in series, and an isolating inductor between rectifier and an AC input. Each storage capacitor is charged to a voltage greater than peak of the AC input. An inverter is connected to the storage capacitors, and has a high frequency inductive load circuit connected between inverter output and a junction between the isolating inductor and double rectifier. A capacitor, connected from the junction to the junction of two storage capacitors, forms a high frequency resonance circuit with the inductive load circuit. Current is drawn from the input AC only as a series of pulses at the inverter frequency. The isolating inductor filters out the high frequency part of the current pulse and makes the input current near sine wave.

Claims

1. An electronic power supply for a high frequency load, comprising:

a high frequency section providing high frequency load current to said load;

a power input section receiving input power at a low AC frequency from line, comprising a doubler rectifier with two storage elements, and an isolating element connected between the doubler rectifier and power line input;

a resonance circuit carrying said load current, connected to said high frequency section, and to said power input section between said isolating element and said doubler rectifier with storage elements, for causing current to be drawn through said isolating element, and to be delivered to said energy storage element, as high frequency current pulses.