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ELECTRICAL BATTERY INTERLOCK TO INSURE INTRINSIC SAFETY

IP.com Disclosure Number: IPCOM000005804D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-08
Document File: 1 page(s) / 61K

Publishing Venue

Motorola

Related People

Eric Brooks: AUTHOR

Abstract

This design insures an intrinsically-safe two-way radio will be operated only with the properly classified battery/radio combination.

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MOTOROLA Technical Developments Volume 9 August 1969

ELECTRICAL BATTERY INTERLOCK TO INSURE INTRINSIC SAFETY

by Eric Brooks

This design insures an intrinsically-safe two-way radio will be operated only with the properly classified battery/radio combination.

   The design consists of an electrical interlock that inhibits radio operation unless the correct radio type and battery type are used simultaneously. This is accomplished through non-mechanical switching and battery recognition.

   The battery package contains as part of its internal structure a high-efficiency, physically small magnet of a suitable material such as neodymium-iron or samarium-cobalt. The magnet would be located inside the battery housing on the surface adjacent to the base of the radio. No external electrical contact point is required. The magnet would not affect the mechanical integrity of the battery package, e.g. water seal, additional holes for electrical contact points, etc.

   The radio contains within its housing a Hall-effect silicon device, located to physically align along the magnet's axis. Again no penetration of the radio housing is required for function. This device would detect the presence or absence of the magnet in a particular battery; this would allow control either through a microprocessor logic function or a discrete electrical circuit, inhibiting all radio function if improper operation is attempted. Use of a non-approved battery would disable the radio function to prevent use...