Power supply unit for electrical discharge machine

Details Power supply unit for electrical discharge machine Power supply unit for electrical discharge machine

1990-05-30

1992-11-10

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6912, 323283, B23H 102

Patent

active

051626314

ABSTRACT:
An electrical discharge machining power supply unit which detects fluctuations in the voltage of a DC power source (3) and sends a signal to an A/D converter (5) and has a microprocessing unit (8) to change the on-time of a transistor switching element (12) in inverse proportion to the rate of voltage fluctuations computed by the microprocessing unit (8), thereby maintaining the voltage supplied across the electrode (1) and workpiece (2). In a second embodiment a pilot power supply and a current detecting element for detecting a dielectric breakdown of the gap is used.

REFERENCES:
patent: 4361745 (1982-11-01), Rupert
patent: 4460815 (1984-07-01), Bell, Jr. et al.
patent: 4590353 (1986-05-01), Obara et al.
patent: 4695696 (1987-09-01), Ozaki et al.
patent: 4954767 (1990-09-01), Buisson et al.

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