Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1978-07-06
1980-10-07
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
330207P, 361 98, H02H 720
Patent
active
042272270
ABSTRACT:
A protective circuit for a push-pull power amplifier comprises a load current-detecting resistor connected between the emitters of two transistors jointly constituting the power amplifier, a switch connected between an intermediate point on the load current-detecting resistor and the ground to shut off load current, a load resistance-detecting circuit for detecting the resistance of the load, and a driving circuit for causing the switch to be opened by an output from the load resistance-detecting circuit when the resistance of the load falls below a prescribed level. The load resistance-detecting circuit includes means for drawing out a first signal from one end of the load current-detecting resistor and, means for drawing out a second signal with lower potential than the first signal from the other end of the detecting resistor. Further, control means is provided for controlling the potential of the first signal according to that of the second signal, thereby increasing the potential difference between the first and second signals above a prescribed value when the resistance of the load falls below a predetermined value. The driving circuit which is supplied with the first and second signals opens the switch when the potential difference between both signals rises above a prescribed level.
REFERENCES:
patent: Re27972 (1973-04-01), Borror et al.
patent: 3500218 (1970-03-01), Burwen
patent: 3536958 (1970-10-01), Sondermeyer
patent: 3633093 (1972-01-01), Templeton, Jr. et al.
patent: 3814987 (1974-06-01), Chacon
patent: 3814988 (1974-06-01), Ito
patent: 3898532 (1975-08-01), Frank
patent: 3924159 (1975-12-01), Hoover
Salce Patrick R.
Tokyo Shibaura Denki Kabushiki Kaisha
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