Power amplifier with current limiting means

Details Power amplifier with current limiting means Power amplifier with current limiting means

1990-05-09

1991-07-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including protection means

330207P, H03F 142

Patent

active

050292994

ABSTRACT:
A power amplifier provided with overload protection responsive to the impedance of a load falling below a threshold value having a pair of power output devices connected to the load and driven through a balanced operational amplifier and transistor couplers. The operational amplifier has opposed voltage supply inputs, and each is connected through a first resistor to a voltage source and to the load through a pair of diodes connected in series opposition and a second resistor, and the junction between the diodes is connected to the base of one of the transistor couplers. A fault condition causes current to flow through the diodes lowering the potentials of the voltage supply inputs and the bias on the transistor couplers.

REFERENCES:
patent: 4714898 (1987-12-01), Botti et al.
patent: 4789842 (1988-12-01), Naxera

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