Electric heating – Metal heating – By arc
Patent
1999-01-14
2000-04-25
Shaw, Clifford C.
Electric heating
Metal heating
By arc
363142, B23K 910
Patent
active
060546743
ABSTRACT:
An AC voltage applied among power input supply terminals is rectified by a rectifier, and the rectified voltage is adapted to be reduced in a voltage-reducing converter with a switch connected in parallel with it. A switching circuit connect smoothing capacitors in series or parallel to the voltage-reducing converter. Inverters are connected in parallel with the respective smoothing capacitors. The output voltages of the inverters are voltage-transformed by transformers. The transformed voltages from the transformers are converted to DC voltages by converters. A control unit renders the voltage-reducing converter operative and causes the switching circuit to connect the smoothing capacitors in series when a third AC voltage is applied among the power supply input terminals. When a second AC voltage lower than the third AC voltage is applied among the power supply input terminals, the control unit causes the switch connected in parallel with the voltage-reducing converter to be closed and causes the switching circuit to connect the smoothing capacitors in series. If a first AC voltage about one-half as high as the second AC voltage is applied, the control unit causes the switch to be closed and causes the switching circuit to connect the smoothing capacitors in parallel.
REFERENCES:
patent: 5272313 (1993-12-01), Karino et al.
patent: 5310992 (1994-05-01), Karino et al.
patent: 5319533 (1994-06-01), Reynolds et al.
patent: 5824990 (1998-10-01), Geissler et al.
Danjo Kenzo
Fujiyoshi Toshikazu
Ikeda Tetsuro
Ishii Hideo
Karino Kunio
Sansha Electric Manufacturing Company Limited
Shaw Clifford C.
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