Apparatus for detecting voltage across thyristor in alternating-

Details Apparatus for detecting voltage across thyristor in alternating- Apparatus for detecting voltage across thyristor in alternating-

1995-05-23

1997-03-04

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219109, 219114, B23K 1125

Patent

active

056076045

ABSTRACT:
A thyristor voltage detector includes a current-limiting resistor having a high resistance (e.g., 30 kilo-ohm) and a switching device (e.g., photo MOS FET) of a switching photo coupler which are serially connected between a thyristor and a waveform converter (e.g., a pair of photo couplers). The photo MOS FET is turned on by a light from a light emitting diode of the switching photo coupler in respect to a high level of a switching control signal. A voltage across the thyristor is applied to the waveform converter via the photo MOS FET and the resistor. The arrangement eliminates the need for a step-down transformer, achieves downsizing and cost cutting, and reduces electric power consumption.

REFERENCES:
patent: 4104724 (1978-08-01), Dix et al.
patent: 4388515 (1983-06-01), Mathews
patent: 4465918 (1984-08-01), Kiriyama et al.
patent: 4954686 (1990-09-01), Izume
patent: 5128604 (1992-07-01), Caen

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