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:
Jun. 16, 1992
Filed:
Nov. 02, 1990
Teruzo Yamaguchi, Tokyo, JP;
Tatsuo Morita, Tokyo, JP;
Obara Corporation, Tokyo, JP;
Abstract
There is disclosed a welding transformer control apparatus capable of controlling the voltage supplied to the primary winding of the welding transformer. The welding transformer control apparatus comprises a voltage detecting circuit connected to the thyristor for detecting a power voltage and a digital operation unit connected to the voltage detecting circuit via an A/D converter for receiving the digital converted power voltage. The digital operation unit is also connected to a voltage setting unit for receiving a predetermined voltage to be supplied to the primary winding of the welding transformer. The digital operation unit compares the predetermined voltage supplied from the voltage setting unit with the power voltage supplied from the A/D converter and provides a signal to suppress the power voltage under the predetermined voltage. There is also provided a thyristor gate pulse generator connected between the digital operation unit and the thyristor for receiving the signal from the digital operation unit and providing a thyristor gate pulse to the thyristor so that the thyristor can effect striking cnrol, i.e., phase control of the power supplied in the primary winding of the welding transformer whereby the voltage supplied to the primary winding of the welding transformer can be controlled under the desired voltage.