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:
Jul. 28, 1998
Filed:
Jul. 29, 1996
Hiroshi Shimada, Chiba-ken, JP;
Miyachi Technos Corporation, Chiba-ken, JP;
Abstract
Inverter-resistance welding control, for any resistance welding machine and for any welding operation, which guarantees a welding current having a quick rise time and which is free from overshoot. In particular, when a maximum allowable current value of the resistance welding machine involved has been entered and a selected current value of a particular welding operation has been entered, a CPU computes an initial pulse width of a control pulse from the maximum allowable current value and the selected current value. In a first cycle of the welding operation, the CPU supplies a first control pulse having the initial pulse width to the inverter circuit to thereby start the welding operation. The initial control pulse width is determined as a function of a machine current capacity and the desired current level of a welding operation, and may be made in proportion to a relative magnitude (ratio) of the desired current to the machine current capacity. In the subsequent cycles of the welding operation, the CPU reads the measured current value of each cycle and compares it with a selected current value to compute the deviation of the measured current value. Based on the deviation, the CPU determines a next pulse width in order that the deviation will be cancelled.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile