Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1994-03-11
1996-04-30
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
2191301, H02M 542, B23K 910
Patent
active
055130933
ABSTRACT:
A method and apparatus for providing an ac signal to load terminals, where the signal has a reduced open circuit voltage is disclosed. The apparatus includes an ac current source connected to the load terminals and an open circuit sensor. A control circuit is connected to the source of ac current and to the open circuit sensor, and when the sensor senses an open circuit the control circuit causes the current source to provide a dc signal. The dc signal is created by allowing the current source to provide a signal of only one polarity. The polarity may be either electrode positive or electrode negative. The current source may be either a phase controlled current source or an inverter. The method includes the steps of detecting the presence of an open circuit at the load terminals and causing the ac power source to provide a half wave signal of only one polarity in response to the detection of an open circuit.
REFERENCES:
patent: 2444168 (1948-06-01), Mulder
patent: 2449456 (1948-09-01), Croco et al.
patent: 2502646 (1950-04-01), Girard
patent: 2617913 (1952-11-01), Oestreicher
patent: 2769118 (1956-10-01), Lester
patent: 2775735 (1956-12-01), de Jong et al.
patent: 2936365 (1960-05-01), Niemi
patent: 2960628 (1960-11-01), Rover
patent: 4015188 (1977-03-01), Denis
patent: 4038515 (1977-07-01), Risberg
patent: 4151396 (1979-04-01), Veal
patent: 4164016 (1979-08-01), Schuchard
patent: 4310744 (1982-01-01), Okada
patent: 4371776 (1983-02-01), Winn
patent: 4392046 (1983-07-01), Tzeng
patent: 4398080 (1983-08-01), Johansson et al.
patent: 4450340 (1984-05-01), Corrigall et al.
patent: 4730352 (1988-03-01), Rovacchi
patent: 5187428 (1993-02-01), Hutchison et al.
patent: 5260545 (1993-11-01), West et al.
patent: 5308952 (1994-05-01), Bunker et al.
Welding Handbook, Chapter 3, Gas Tungsten Arc Welding, pp. 74-107, American Welding Society (1991).
International Electrotechnical Commission IEC Report, Publication 479-1 (1984).
ISO/TC44-IEC/TC26 JWG1(Sec) 34, Draft for a revision of IEC 974-1, Arc Welding Equipment, Power Sources (Jan. 1994).
Miller Electric Mfg. Co.
Nguyen Matthew V.
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