Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1978-02-24
1979-05-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including protection means
H03F 130
Patent
active
041526686
ABSTRACT:
A protection circuit for amplifier circuits comprises first and second power source terminals, a first resistor connected at one end to the first power source terminal, a first Zener diode circuit including a plurality of first Zener diodes and connected between the first resistor and the second power source terminal, a second Zener diode connected between the first and second power source terminals, a series circuit including second and third resistors and connected across the second Zener diode, a transistor which is connected at the base to a junction between the second and third resistors and at the collector to the other terminal of the first resistor, and a second Zener diode circuit including a plurality of third Zener diodes and connected between the emitter of the transistor and the second power source terminal. The other end of the first resistor is connected through a signal interruption circuit to a power amplifier section. When voltage between first and second power source terminals or an operation temperature rises to exceed a predetermined value, the voltage drop produced across the first resistor energizes the signal interruption circuit to interrupt an input signal flow to the power amplifier section.
REFERENCES:
patent: 3755751 (1973-08-01), Ring
patent: 3967207 (1976-06-01), Wheatley
patent: 4021701 (1977-05-01), Davies
Mullins James B.
Tokyo Shibaura Electric Co. Ltd.
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