H - Electricity – 02 – H
Patent
H - Electricity
02
H
315/24, 345/30
H02H 7/22 (2006.01) H02H 1/00 (2006.01) H02H 3/32 (2006.01) H02H 3/44 (2006.01)
Patent
CA 1110318
ARC DETECTION AND CONTROL APPARATUS ABSTRACT OF THE DISCLOSURE Arc detection and control apparatus for a high power high voltage gas laser with a constant current power supply com- prises a circuit responsive to changes in voltage across the laser electrodes for disconnecting the power supply when the voltage change exceeds a predetermined limit. The circuit moni- tors a small proportional value of the interelectrode voltage through an optical coupler and has a multiplier circuit for con- verting detected voltage changes and the differential thereof into pulses with a constant amplitude for fixed percentage changes of the electrode voltage and into pulses with increasing amplitudes for proportionally greater electrodes voltage changes. This cir- cuit normalizes and filters the resultant pulses and permits them to be compared to a reference voltage in a comparator circuit. When the pulse amplitude exceeds the value of the reference vol- tage a control apparatus is actuated which disconnects the power supply from the laser electrodes.
300345
Rowe Don H.
Sasnett Michael W.
R. William Wray & Associates
Spectra-Physics Inc.
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