Patent · US Expired

Control circuit for the current of a welding transformer

US4672166A · kind A · utility

3Cited by

2References

6Claims

0Family size

Assignee

Accumulatorenfabrik Sonnenschein GmbH · DE

Inventors

Jorg Ladeburg · Büdingen, DE
Robert Reed Becker · Büdingen, DE
Bernhard Dreymann · Büdingen, DE
Thomas Gensler · Büdingen, DE
Robert Ulrich · Büdingen, DE
Paul Wahrenbruch · Gedern, DE
Reinhard Blaser · Büdingen, DE

Key dates

Filing date	Jan 30, 1986
Grant date	Jun 9, 1987
Priority date	—
Expiry date	Jan 30, 2006

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K11/24
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The invention is directed to a control circuit for controlling the current of a welding transformer integrated in an industrial robot. For the purpose of achieving a simpler, more accurate and more reliable detection of contact between the welding tongs (4, 5) and the parts (11, 12) to be joined by welding, there are provided a high-frequency generator (1) for supplying measuring current to the secondary circuit (2) of the welding transformer, an impedance measuring circuit (3), an additional impedance (7) for increasing the impedance of the secondary current (2) to high frequency, an interrupter circuit (8) for interrupting the welding current, and a comparator for enabling the welding current merely in the presence of a differential voltage signal which corresponds to complete contacting of the two parts to be joined by welding.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.