Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1983-08-22
1984-08-07
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307252J, 307263, 307268, H03K 1772
Patent
active
044645856
ABSTRACT:
A gate circuit of a gate turn-off thyristor has first and second circuit means. The first circuit means consists of a diode, a pulse transformer with a voltage dividing point in the primary section, and a switching element. The transformer provides a pulse current of a large rising rate between the cathode and gate of the thyristor when the switching element is closed and also provides a pulse current of a smaller falling rate between the cathode and gate when the switching element is open. The second circuit means consists of at least a single capacitor, which is connected between the voltage dividing point of the transformer and a d.c. power supply feeding an electrical power to the two circuit means so as to produce a higher voltage than that of the power supply at one end of the primary section, which is blocked by the diode from the power supply, when the switching element is open, and so as to discharge down to a lower voltage than that of the power supply at one end of the primary section when the switching element is closed.
REFERENCES:
patent: 3681677 (1972-08-01), Badal
patent: 3772532 (1973-11-01), Petrov et al.
patent: 3787738 (1974-01-01), Horwath
patent: 4203047 (1978-03-01), Seki
IEEE IAS Annual Mtg. Conference Record pp. 1088-1098, T. Jinzenji et al., "Three Phase Static Power Supplies for Air-Conditioned Electric Coaches Using High Power GTO".
Tokyo Shibaura Denki Kabushiki Kaisha
Zazworsky John
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