Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1997-12-18
1999-05-11
Gaffin, Jeffrey
Electrical transmission or interconnection systems
Switching systems
Plural switches
307115, 219 6911, 219 6913, 219 6916, 219 6919, B23H1/02
Patent
active
059030674
ABSTRACT:
A power supply apparatus for an electric discharge machine comprises a first power supply device comprising a high impedance circuit connected in series to a DC power supply unit and a second power supply device comprising a low impedance circuit, intermittently applies a pulse voltage to a space between a tool electrode and a workpiece opposite to the tool electrode with a specified gap therebetween from the first power supply device, and also supplies a machining current to the space from the second power supply device after generation of electric discharge, in which the second power supply device provides therein a plurality units of switching devices connected in parallel to each other, the number of ON-units switching circuit for controlling the number of switching devices to be simultaneously turned ON, and an ON-time control unit for variably controlling ON-time of the switching devices.
REFERENCES:
patent: 4395612 (1983-07-01), Izumiya
patent: 4447713 (1984-05-01), Tsurumoto et al.
patent: 5329088 (1994-07-01), Kaitani et al.
patent: 5416290 (1995-05-01), Magara et al.
patent: 5770831 (1998-06-01), Kancko et al.
Sato Seiji
Yamada Hisashi
Gaffin Jeffrey
Mitsubishi Denki & Kabushiki Kaisha
Paladini Albert W.
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