The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Dec. 21, 1998
Nippo Electric Co., Ltd., Kanagawa-ken, JP;
Abstract
A commercial power supply is connected to a rectifier DB through a low-pass filter LPF. A smoothing capacitor Cs, a series circuit consisting of voltage-dividing capacitors C,and C,and a series circuit consisting of switching elements Q,and Q,are connected in parallel to the output of the rectifier DB. Diodes D,and D,are connected in reverse parallel to the switching elements Q,and Q,respectively. A drive circuit DR is connected to the switching elements Q,and Q,Between a connecting point that is between the voltage-dividing capacitors C,and C,and a connecting point that is between the switching elements Q,and Q,a load circuit R consisting of a parallel circuit is connected. The parallel circuit includes an inductor Lo, a fluorescent lamp LT, and a resonance capacitor C,By turning the switching elements Q,and Q,on and off, the inductor Lo is caused to perform a step-up inverter operation, whereby stable high-frequency voltage with a high voltage is generated across both ends of the inductor Lo. As a result, a neutral point inverter capable of generating high-frequency voltage that has a high voltage and less “undulation” can be provided.