Current limiter

Details Current limiter Current limiter

1978-06-20

1980-08-12

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328171, H03K 508

Patent

active

042175038

ABSTRACT:
A current limiter such as a thermistor has a slow response time and inserts appreciable loss to normal signal currents that do not need limiting. The present invention uses a diode quad (6,7,8 and 9) arranged in a full-wave rectifier configuration. The AC terminals of the quad are inserted in series in the circuit whose current is to be limited. The DC terminals are connected to receive a DC bias current from a constant current source (P, R1). A signal from a signal generator (1) flows through a load (2) substantially unhindered by the current limiter until its instantaneous valve reaches that of the bias current I, in which case the signal current is clipped regardless of the direction of its current flow because the signal current cancels the bias current flowing through two of the diodes thereby reverse biasing them and effectively switching the current through the constant current generator. For practical telephone applications it suffices if the resistance (R1) of the bias source is at least ten times that of the load (2).

REFERENCES:
patent: 2803703 (1957-08-01), Sherwin
patent: 3027466 (1962-03-01), Roalef

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