Electrical discharge machining power supply with digitally contr

Details Electrical discharge machining power supply with digitally contr Electrical discharge machining power supply with digitally contr

1979-05-07

1981-09-29

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, B23P 102

Patent

active

042924901

ABSTRACT:
A digitally controlled and free-running multivibrator for the power supply is used to supply machining power pulses of predetermined ON and OFF time duration. The pulse output from the digital multivibrator is passed through at least one intermediate drive stage to trigger an electronic output switch, which is operatively connected both to a main DC power source and the gap, to actually provide the machining power pulses thereto. Responsive to a predetermined drop in gap voltage, a digitally predetermined extended OFF time is added.

REFERENCES:
patent: 3697879 (1972-10-01), Holliday
patent: 3805012 (1974-04-01), Bell, Jr. et al.
patent: 3809848 (1974-05-01), Bell, Jr.
patent: 4078163 (1978-03-01), Bell, Jr. et al.

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