초록 ▼

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 charg

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.

대표청구항 ▼

A switching circuit for connecting and disconnecting a voltage source and an electrical load comprising, a direct voltage source having positive and negative terminals, an N-channel field effect transistor having a gate, a drain and a source, means connecting said drain to the positive terminal of s

A switching circuit for connecting and disconnecting a voltage source and an electrical load comprising, a direct voltage source having positive and negative terminals, an N-channel field effect transistor having a gate, a drain and a source, means connecting said drain to the positive terminal of said voltage source, an electrical load connected between said source of said transistor and said negative terminal, a capacitor, a charge circuit for charging said capacitor, a discharge circuit for discharging said capacitor, means responsive to the voltage across said capacitor attaining a predetermined charge voltage when said capacitor is charging for disabling said charge circuit while substantially simultaneously enabling said discharge circuit to cause said capacitor to begin to discharge, means responsive to said capacitor attaining said predetermined voltage for causing the voltage of said voltage source and the voltage attained by said capacitor to be added in series to provide a gate bias voltage that is substantially the sum of the voltage of said voltage source and the voltage attained by said capacitor and for applying said gate bias voltage to said gate to thereby provide a gate bias voltage that is high enough to bias said transistor conductive between its drain and source, means for sensing said gate bias voltage as said capacitor discharges and for causing said charge circuit to be re-enabled to recharge said capacitor when said gate bias voltage decreases to a predetermined value due to discharge of said capacitor, said predetermined value of gate bias voltage being high enough to maintain said transistor biased conductive, and control means comprising a switching means for at times connecting said gate to said negative terminal to thereby cause said transistor to be biased nonconductive, said switching means when nonconductive permitting said transistor to be biased conductive.