Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1985-06-28
1987-04-28
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
361 94, 361 98, 361101, H02H 902
Patent
active
046618791
ABSTRACT:
An overcurrent protection circuit including a first transistor, a second transistor, and an integrator. The first transistor operates to control a current flow from a power source to a load. The second transistor is turned on when an overcurrent flows through the first transistor. The overcurrent is detected by watching the collector-emitter voltage of the first transistor. Thus, the second transistor operates to bypass the base current to be supplied to the first transistor with a certain delay time defined by a delay part, which enables an instantaneous overcurrent to be ignored.
REFERENCES:
patent: 3403320 (1968-09-01), Whitman, Jr.
patent: 3534249 (1967-07-01), Neill et al.
patent: 3755679 (1973-08-01), Otsuka
patent: 4307440 (1981-12-01), Inove et al.
patent: 4528608 (1985-07-01), Anderson et al.
Motorola, Zener Diode/Rectifier Handbook, Motorola Inc., Second Edition, pp. 36-39.
"Jitsuyo Denshi Kairo Handobukku" (Handbook of Practical Electronic Circuits), pp. 377 and 378 (especially Figs. 6-19, 6-20, and 6-21), Sept. 30, 1972, CQ Shuppan Kabushiki Kaisha pub., Tokyo, Japan.
Mori Hiroyoshi
Sato Kazuhiro
Fujitsu Limited
Gaffin Jeffrey A.
Pellinen A. D.
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