Transistor failure selection circuit and structure for ease of m

Details Transistor failure selection circuit and structure for ease of m Transistor failure selection circuit and structure for ease of m

1991-10-11

1992-08-04

Shaw, Clifford C.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By dynamoelectric machine converter

363 56, B23K 910

Patent

active

051361388

ABSTRACT:
A transistor failure selection circuit and structure for ease of maintenance. The disclosed circuit and structure reduce maintenance time and costs for a welding station. The circuit biases a specific selected transistor at a different operating point than any other transistor in a bank of transistors. Upon an overcurrent condition which exceeds the design current rating of the welding station the circuit causes the specific selected transistor to fail in preference to the failure of any other transistor located in the transistor bank. The selected transistor is mounted in a readily accessible location of the welding station and is easily replaced in the event of failure. This eliminates the need for the operator to remove the entire bank of transistors and/or other components or circuits typically found in a welding station in order to access and replace the failed transistor.

REFERENCES:
patent: 4409465 (1983-10-01), Yamamoto et al.
patent: 4620082 (1986-10-01), Graville et al.

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