Apparatus to prevent overcurrent or overvoltage

Details Apparatus to prevent overcurrent or overvoltage Apparatus to prevent overcurrent or overvoltage

1975-01-29

1976-11-16

Miller, J D

Electricity: power supply or regulation systems

Remote sensing

317 16, 317 31, 317 33VR, 323 9, 307289, 307251, H02H 308

Patent

active

039926508

ABSTRACT:
Across a D.C. power source 1, a load 2, a switching element 4, such as a transistor having a control electrode c (base), and a voltage detection means 5, such as a resistor, are connected in series, and a known negative resistance device 6, having two terminals 31 and 32, is connected by its one terminal 32 to said control electrode c of the switching element 4 and by its other terminal 31 to one end of said series resistor 5 which one end is opposite to that connected to said switching element (4), wherein said negative resistance device 6 comprises, as shown in FIG 2, known complementary connection of a depletion mode n-channel field-effect transistor (FET) and a depletion mode p-channel FET. The FETs are connected from source to source, and from the gate of each to the drain of the other so that when an overcurrent to the load 2 or an overvoltage at the voltage source 1 occurs, voltage across said resistor 5 exceeds a preset value, the negative resistance device 6 is cut-off, thereby cutting off the switching element 4.

REFERENCES:
patent: 3234453 (1966-02-01), Klees et al.
patent: 3369129 (1968-02-01), Wolterman
patent: 3521087 (1970-07-01), Lombardi
patent: 3603811 (1971-09-01), Day et al.
patent: 3605728 (1971-09-01), Ogle
patent: 3654518 (1972-04-01), Phelps et al.
patent: 3714512 (1973-01-01), Grabowski
"Negative Resistance Circuit Using Two Complementary Field Effect Transistors," Recording of the IEEE, 1965, p. 404, Apr. 1965, by Ostefjells.
"Synthesis of Electronic Bistable Circuits" p. 25-35 of IEEE Transactions on Circuit Theory, Mar. 1968, Hill, Pederson, Pepper.

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