Amplifiers – Miscellaneous – Amplifier protection means
Patent
1975-06-26
1976-11-02
Mullins, James B.
Amplifiers
Miscellaneous
Amplifier protection means
318566, 318681, 330 15, 330146, H03F 2100
Patent
active
039900207
ABSTRACT:
A DC linear power amplifier is disclosed having a first amplifier referenced to +14VDC, for receiving a control signal. The first amplifier in turn controls a first power stage connected to a load through a first sensing resistor. The first resistor provides a differential voltage to a second amplifier forming a current control loop with the first amplifier. A third amplifier controls a second power stage connected to the load through a second sensing resistor, so that the first and second power stages each dissipate equal power. The resistors each provide differential signals to a comparator which provides a first output signal if the current through each resistor is the same. If the differential signals are different, resulting from the load shorting to ground, the comparator provides a second output signal which turns the entire power amplifier essentially off. The entire power amplifier returns to normal when the short is eliminated.
REFERENCES:
patent: 3212019 (1965-10-01), Schwartz
patent: 3806787 (1974-04-01), Erlen
buhler, "Power Amplifier Providing Low-Power Dissipation in a Variable Speed Reel-to-Reel Tape Transport", IBM Technical Disclosure Bulletin, vol. 16, No. 8, Jan. 1974, pp. 2621-2623.
Cardenas Rafael A.
Hughes Aircraft Company
MacAllister William H.
Mullins James B.
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