Electric heating – Metal heating – By arc
Patent
1999-06-30
2000-07-18
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913032, B23K 9095
Patent
active
060910496
ABSTRACT:
A power supply apparatus for use with an arc utilizing device includes capacitors coupled in series between outputs of a rectifying unit, and inverters each of which is coupled across a respective one of the capacitors. Each inverter converts a DC voltage from the capacitor into a high frequency voltage and applies it to a respective one of transformers. A converter converts an output voltage from each transformer into a DC voltage for application to a load. An output detector generates a signal representative of an output current supplied to the load. A first voltage detector generates a signal representative of a first voltage to be applied to the inverters. A second voltage detector generates a signal representative of a second voltage across one of the capacitors. A voltage balancing unit generates control signals for determining the conduction periods of the respective inverters in accordance with the difference between the output representative signal and a preset desired-output-current representative signal. The voltage balancing unit modifies at least one of the control signals to change the conduction period of the inverter associated therewith in accordance with the difference between the first- and second-voltage representative signals.
REFERENCES:
patent: 4503316 (1985-03-01), Murase et al.
patent: 4564742 (1986-01-01), Karlsson
patent: 5272313 (1993-12-01), Karino et al.
patent: 5310992 (1994-05-01), Karino et al.
patent: 5811757 (1998-09-01), Higgins
Ikeda Tetsuro
Morimoto Takeshi
Ono Masayuki
Sansha Electric Manufacturing Company Limited
Shaw Clifford C.
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