Current limiting circuit

Details Current limiting circuit Current limiting circuit

1981-04-27

1982-07-06

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 88, 361 86, 361 91, 361 93, 330298, 330207P, 323276, 323315, H02H 308

Patent

active

043386466

ABSTRACT:
A current limiting circuit is provided wherein the monitored voltage is applied to the base of first and second transistors, the first transistor having a substantially larger emitter area than the second transistor. Impedance means are connected to the emitters of the first and second transistors such that they function in conjunction with the emitter area ratio causing the current flowing through the first transistor to be higher than that flowing through the second transistor at low base voltages, while at higher base voltages the current flowing through the second transistor is higher than flowing through the first transistor. At some intermediate voltage the current flowing through both the first and second transistors is equal. This property may be used, for example, in a voltage regulator so as to divert base drive current from the output transistor at the point where the first and second currents are equal.

REFERENCES:
patent: 3801894 (1974-04-01), Spiegel
patent: 3886410 (1975-05-01), Seer, Jr.
patent: 4053996 (1977-10-01), Schertz et al.
patent: 4254372 (1981-03-01), Moore, Jr.

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