Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1983-02-25
1984-12-18
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 68, 307311, 307252L, H02H 7125
Patent
active
044893728
ABSTRACT:
An optical gate signal generating apparatus for firing a plurality of thyristors in a thyristor converter apparatus, including a circuit for generating an electrical gate signal, a plurality of first light emitting elements, each being connected to receive the electrical gate signal for generating a first optical signal. The apparatus also includes a plurality of auxiliary circuit, each including a series connection of a second light emitting element and a nonlinear element and being connected to receive the electrical gate signal for generating a second optical signal, each of the auxiliary circuits being connected in parallel with each of the first light emitting elements, and a plurality of light guides, each having a first, a second and a third branches, each of the light guides being connected to receive the first and second optical signals at ends of the first and second branches, respectively and for guiding the first and second optical signals to an end of the third branch to produce the optical gate signal. The thyristor converter apparatus including the optical gate signal generating apparatus is also disclosed.
REFERENCES:
patent: 4039925 (1977-08-01), Fletcher et al.
"Field Testing of Light-Triggered Thyristors in an Electric Utility Application", L. R. Lowry et al., 1981 IEE, soc/HVDC conf. 1981, 11.
Patents Abstracts of Japan, vol. 5, No. 40 (E-49) [712], Mar. 17, 1981 & JP-A-55 162 875 (Hitachi Seisakusho K.K.) 12-18-1980.
Electronique Applications, No. 15, 1980, pp. 5-15, Paris, "Les Photocoupleurs", Fig. 33b.
Wissenschaftliche Berichte Aeg-Telefunken, vol. 50, 1977, pp. 22-31, Berlin, W. Lukanz, "Halbleiterschalter und-steller fur den Mittelspannungsbereich".
Hatano Yukihiko
Takahashi Tadashi
Jones Jordan
Shoop William M.
Tokyo Shibaura Denki Kabushiki Kaisha
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