Fail transistor detection and display system for electrical discharge machining apparatus
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United States of America Patent
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-
Mar 22, 1988
Grant Date -
N/A
app pub date -
Feb 28, 1986
filing date -
Feb 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An EDM circuit that detects power transistor switch failure. A comparator 62 and a sample and hold stage 60 are used during a window of time formed by the off-time of a pulse generator to determine whether power switch MOSFET 30 is conducting. If MOSFET 30 is conducting during the off-time of the pulse generator LED 72 will emit light to indicate a failed power transistor switch.
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