Protection circuits for complementary direct-coupled amplifiers

Details Protection circuits for complementary direct-coupled amplifiers Protection circuits for complementary direct-coupled amplifiers

1981-11-19

1984-09-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330298, 330 59, H03F 326, H03F 1700

Patent

active

044713231

ABSTRACT:
An electronic circuit provides short circuit protection and idle current control for a direct-coupled power amplifier.
For short circuit protection, a voltage proportional to output current is monitored and is fed to a light emitting diode (LED). Light energy emitted from the LED as a function of output current is optically coupled to a phototransistor which steals drive current from the input transistor of the output amplifier hence turning off the output transistor.
For automatic idling current control, the idle current of a complementary output transistor pair is sampled by operational amplifiers each having an inhibit gate connected from the output of a respective comparator. The comparator produces an inhibit output when the output transistor pair is providing load current to the load. When the pair is not providing load current, the amplifier amplifies the idling current from the pair and provides it to an LED. The LED emits light energy as a function of idle current to a phototransistor which is optically coupled to receive the light and regulate the idle current as a function thereof.

REFERENCES:
patent: 3315176 (1967-04-01), Biard
patent: 3914703 (1975-10-01), Stauffer
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 4121168 (1978-10-01), Stitt
patent: 4206415 (1980-06-01), Boudouris et al.

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