Control system for periodically energizing a capacitive load

Details Control system for periodically energizing a capacitive load Control system for periodically energizing a capacitive load

1973-07-20

1976-01-13

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, 307265, 307269, H03K 118, H03K 458, H03K 504, H03K 1760

Patent

active

039327736

ABSTRACT:
Two pairs of serially connected insulated-gate field-effect transistors (IGFETs) are bridged in parallel across a d-c supply, the junction of the drain and source electrodes of the first pair of IGFETs being tied to the gate of one of the IGFETs of the second pair whose junction is connected to a capacitive load circuit to be periodically energized under the control of at least one train of trigger pulses of low duty ratio applied to the gate of at least one of the IGFETs of the first pair. The gates of the IGFETs of the second pair are alternately triggered through the intermediary of a further IGFET, or pair of serially interconnecred IGFETs, controlling the other IGFET of the second pair. The input capacitances of these latter IGFETs are small compared with that of the load, and their transconductance is low with reference to the load capacitance whereby the rise and fall of the load voltage at the junction of the second IGFET pair outlasts the duration of a trigger pulse; this feature is utilized in some embodiments to make the same train of trigger pulses alternately effective to switch conduction between the second pair of IGFETs.

REFERENCES:
patent: 3629618 (1971-12-01), Fujimoto
patent: 3660684 (1972-05-01), Padgett et al.
patent: 3735277 (1973-05-01), Wanlass
patent: 3774055 (1973-11-01), Bapat
patent: R27305 (1972-03-01), Polkinghorn et al.

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