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:
Jan. 31, 2006
Filed:
Aug. 25, 2003
Takeshi Morimoto, Osaka, JP;
Hideo Ishii, Osaka, JP;
Takeshi Morimoto, Osaka, JP;
Hideo Ishii, Osaka, JP;
Sansha Electric Manufacturing Company, Limited, Osaka, JP;
Abstract
An IGBT () intermittently interrupts a current from a positive terminal (P) of a DC supply () to a workpiece (). An IGBT () intermittently interrupts a current from a negative terminal (N) of the DC supply () to the workpiece (). A control circuit () and a drive signal generating circuit () ON-OFF control the IGBTs (). The control circuit () causes the drive signal generating circuit () to control the IGBTs () in such a manner as to provide a repetition of a cycle consisting of an AC period during which the IGBTs () are alternately rendered conductive, and a DC period following the AC period during which the IGBT () is rendered continuously conductive. Further, the control circuit () and the drive signal generating circuit () simultaneously render the IGBT () and the IGBT () nonconductive and conductive, respectively, at least once during the DC period, and, thereafter, simultaneously render the IGBT () and the IGBT () conductive and nonconductive, respectively.