Power supply unit for discharge apparatus which prevents excessi

Details Power supply unit for discharge apparatus which prevents excessi Power supply unit for discharge apparatus which prevents excessi

1995-09-08

1998-09-01

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 714

Patent

active

058013520

ABSTRACT:
A power supply unit for a discharge machining apparatus which eliminates overshooting in current rise and improves the electrode consumption characteristics by preventing an operational amplifier as well as a current control element from being saturated, thereby eliminating overshooting during the rise time of the machining current, by clamping the output voltage of the operational amplifier during the stand-by time for electric discharge. The output is clamped by a plurality of resistors and diodes to a state where the output voltage is higher than a power-supply voltage (the output clamp level is set by a resistor). Namely, during the stand-by time when inverted amplification (feedback) via a resistor in an operational amplifier is being carried out, a constant state of feedback is maintained by the diodes.

REFERENCES:
Operational Amplifiers, Design and Applications, pp. 242-244, Dec. 1971.

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