Intrinsically safe battery circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor

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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.

REFERENCES:
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patent: 3512047 (1967-05-01), Garde
patent: 3517264 (1970-06-01), Anderson, Jr.
patent: 3535592 (1970-10-01), Roveti
patent: 3553531 (1971-01-01), Rimondini
patent: 3579089 (1971-05-01), Giess
patent: 3686530 (1972-08-01), Bogut
patent: 3748569 (1973-07-01), Frank et al.
patent: 4363064 (1982-12-01), Billings et al.
patent: 4404473 (1983-09-01), Fox
patent: 4438473 (1984-03-01), Cawley et al.
Motorola "MX" Current Limited Battery Schematic.

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