Switching circuit utilizing a field effect transistor

Details Switching circuit utilizing a field effect transistor Switching circuit utilizing a field effect transistor

1986-01-13

1987-01-13

Hickey, R. J.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

307110, 307578, 307584, 322 73, 363 61, 363 17, H02J 714, H03K 17687

Patent

active

046367055

ABSTRACT:
A switching circuit that utilizes an N-channel field effect transistor. The circuit can be used in a generator voltage regulator wherein the drain and source of the transistor are connected in series with the field winding of the generator. The circuit includes a capacitor that is repetitively charged and discharged. At the end of the charge period a gate bias voltage is developed that is applied to the gate of the transistor. The magnitude of the gate bias voltage that is developed is the sum of the capacitor voltage and the voltage of a voltage source. The capacitor is allowed to discharge until the gate bias voltage decreases to a value that is high enough to maintain the transistor conductive whereupon the discharge period is terminated and the capacitor is recharged. The system responds to the magnitude of the output voltage of the generator relative to a reference voltage and will cause the transistor to be biased conductive or nonconductive for total time periods that are equal to the sum of a plurality of consecutively occurring timing periods.

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