Ion nitriding power supply

Details Ion nitriding power supply Ion nitriding power supply

1986-03-14

1988-03-22

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315306, 315308, 315111, 315 21, 31511181, 363 17, 363 58, G05F 100, H05B 3702, H05B 3904, H05B 4136

Patent

active

047331372

ABSTRACT:
In the ion nitriding power supply disclosed herein, power to the discharge chamber is normally current-regulated by a pulse-width modulated current switching device effectively in series with a switching inverter which energizes the chamber, instantaneous current variations being smoothed by a series inductance which, together with the chamber, is shunted by a freewheeling diode. Incipient arcing is quickly extinguished by semiconductor switching devices incorporated in the inverter which, when energized simultaneously, shunt the chamber, instantaneous current limiting being provided by the series inductance. The shunt switching devices are triggered when the voltage across the discharge drops below a level indicative of the formation of an arc.

REFERENCES:
patent: 3969652 (1976-07-01), Herzog
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4041365 (1977-08-01), Peak et al.
patent: 4068294 (1978-01-01), Anderson et al.
patent: 4301498 (1981-11-01), Farrer
patent: 4485434 (1984-11-01), Beeston et al.
patent: 4504895 (1985-03-01), Steigerwald
patent: 4628426 (1986-12-01), Steigerwald

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