Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-05-19
1984-06-12
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307246, 307282, 307571, H03K 504, H03K 708, H03K 17687
Patent
active
044544308
ABSTRACT:
High voltage FET's (field effect transistors) are used to modulate a traveling wave tube, which makes it possible to achieve fast rise, fall and delay chracteristics, and very long pulsewidths to CW because of their low drive requirements to maintain the on condition. The low and high voltage portions of the modulator are coupled via special transformers having only one or two turns for each winding on torroidal cores. Since such transformers are not adequate for long pulse widths, the gate to source capacitance of a high voltage FET is charged with a short pulse from one transformer and held there by a blocking diode until it is removed by the off drive. To obtain pulse widths all the way out to CW, a regeneration circuit is incorporated in the low voltage circuitry so that if the commanded on time goes beyond a maximum time, successive pulses are generated to maintain the voltage between gate and source of the on FET.
REFERENCES:
patent: 3798608 (1974-03-01), Huebner
patent: 3928809 (1975-12-01), Tschudi et al.
patent: 4002932 (1977-01-01), Zaslav
patent: 4052623 (1977-10-01), Loberg
patent: 4140980 (1979-02-01), Cummings
patent: 4159478 (1979-06-01), Jaklitsch et al.
patent: 4170740 (1979-10-01), Pernyeszi
patent: 4193032 (1980-03-01), Milberger et al.
patent: 4425518 (1984-01-01), Milberger
Franz Bernard E.
Heyman John S.
Singer Donald J.
The United States of America as represented by the Secretary of
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