Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1983-07-15
1985-12-31
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219483, 219508, 363 70, 323343, H05B 102
Patent
active
045623384
ABSTRACT:
A heating power supply apparatus for polycrystalline semiconductor rods, including a power transformer and anti-parallel thyristor unit groups connected to respective portions of the secondary of the power transformer, balance transformer groups connected to the anti-parallel thyristor groups and combined to make constant a secondary current of each of the balance transformers, and semiconductor rod connecting terminals connected to the secondaries of the balance transformer groups, respectively. The balance transformer groups are divided into a group of plural balance transformers of small current and high voltage for exclusive use during the starting and a group of plural balance transformers for taking over operation from the group of balance transformers of small current and high voltage and continuing subsequent operations.
REFERENCES:
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patent: 3320476 (1967-05-01), Beese
patent: 3579092 (1971-05-01), Matzl
patent: 3663828 (1972-05-01), Low et al.
patent: 3728611 (1973-04-01), Elvin
patent: 4220911 (1980-09-01), Rosa
Osaka Titanium Co., Ltd.
Paschall M. H.
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