Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1984-12-31
1987-01-20
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 93, H02H 902
Patent
active
046383964
ABSTRACT:
An overload protection circuit is disclosed which limits the current supplied by a battery to a load. The circuit is particularly adapted for use in portable radio applications which must meet rigorous specifications of intrinsically safe equipment for use in hazardous environments. Load sensor 20 continuously monitors for the presence of load to enable power switch 16 via switch control 22. Current trip circuit 24 monitors the voltage developed across current sensor 18 to provide a disable signal to switch control 22 in the event of an overload condition. Current limit circuit 26 limits the drive signal to power switch 16. Voltage trip circuit 28 prevents overdissipation of the power switch device. Thus, intrinsically safe battery circuit 30 provides protection such that hazardous gases will not be ignited by sparks or thermal heating during overload conditions.
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Motorola "MX" Current Limited Battery Schematic.
Frew Paul C.
Mills David R.
Mukli Glenn A.
Boehm Douglas A.
Gaffin Jeffery A.
Motorola Inc.
Pellinen A. D.
Southard Donald B.
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