Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1982-06-21
1984-01-31
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
330207P, 361 86, 361 91, 361 94, H02H 308
Patent
active
044293399
ABSTRACT:
An AC transistor switch is provided with simple, accurate and fast overcurrent protection circuitry. A pair of transistors are connected in anti-series across an AC load line, and each transistor has an anti-parallel diode therearound conducting current in the alternate half cycles. Comparator means senses current flow through the diodes and is responsive to given threshold overload current to turn off the transistors. Voltage sensing means is referenced to a common point between the series connected transistors and senses the voltage at each main terminal relative to the common point to thus sense the voltage drop from the common point across each diode to its respective main terminal for sensing current flow through the respective diode. The current representative voltage is sensed through respective dedicated third and fourth diodes connected to the main terminals and having a common anode connection to the voltage sensing means such that the latter senses the more negative of the main terminals regardless of the relative potential therebetween.
REFERENCES:
patent: 4042889 (1977-08-01), Baker
patent: 4158866 (1979-06-01), Baker
patent: 4173739 (1979-11-01), Yoshida
patent: 4301490 (1981-11-01), Nagel et al.
patent: 4375074 (1983-02-01), Glogolja
"Buffer Circuit for Line Driver Protects Against Shorts and .+-.325-V Surges" Electronic Design 11/8/77 pp. 102, 104.
Jaeschke James R.
Rutchik Walter L.
Eaton Corporation
Grace C. H.
Moose Jr. Harry E.
Taken M. E.
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