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:
Nov. 20, 2001
Filed:
Oct. 22, 1998
Takashi Jochi, Chiba-ken, JP;
Mikio Watanabe, Chiba-ken, JP;
Miyachi Technos Corporation, Chiba-ken, JP;
Abstract
Disclosed is a resistance-welding power supply apparatus comprising a large-capacitance capacitor for storing a welding energy in the form of electric charge, a charging unit for charging the capacitor up to a predetermined voltage, a transistor group electrically connected between the capacitor and a welding electrode on one hand, and a control unit for causing a switching action of the transistor group at a predetermined frequency during the weld time to provide a control of a welding current I. The charging unit includes a charging transformer and a rectifying circuit. The control unit includes a main control unit for providing a control of the switching action of the transistor group by way of a drive circuit. The control unit further includes various sensors, measuring circuits and an arithmetic circuit, for providing a feedback control of the welding current, an interelectrode voltage or a welding power.