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BATTERY SAVING TECHNIQUE FOR PORTABLE RADIOS USING INFRA-RED DETECTION

IP.com Disclosure Number: IPCOM000007106D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Feb-26
Document File: 1 page(s) / 77K

Publishing Venue

Motorola

Related People

Paul Dominic Baker: AUTHOR

Abstract

A major concern with current portable radio products is battery life. The ability ofa radio to have an extended lifespan without the need for re-charging the battery is an important feature/selling point. This invention covers the concept ofusing low cost infra- red sensors in portable radios to minimize the usage .of some high power ergonomic features, thus expanding the battery life. Some examples of high power ergonomic features could include: -Display backlighting, -Keypad backlighting.

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Technical Developments Volume 21 February 1994

BATTERY SAVING TECHNIQUE FOR PORTABl+E RADIOS USING INFRA-RED DETECTION

by Paul Dominic Baker

  A major concern with current portable radio products is battery life. The ability ofa radio to have an extended lifespan without the need for re-charging the battery is an important feature/selling point. This invention covers the concept ofusing low cost infra- red sensors in portable radios to minimize the usage
.of some high power ergonomic features, thus expanding the battery life. Some examples of high power ergonomic features could include:

-Display backlighting, -Keypad backlighting.

  Note that portable radios currently use timers to limit the use of high power ergonomic features. This proposal ~assumes that an infra-red mechanism would co-exist with such a timing mechanism, and would provide additional savings to that already provided by the timing mechanism.

  To assess the viability of the concept proposed by this invention, a description has been given for each of the following areas:

[l] Typical current consumption for backlighting within portable radios.
[2] Typical standby current for a low cost infrared sensor circuit.
[3] Space requirements for an itiared sensing facility.
[4] An example of how such the invention could be implemented as part of a portable radio ergonomics.

[ 1] Typical current consumption for:

-a single backlight LED on an HT800 radio was measured at 14mA. Note that for keypad back- lighting more than one LED is used.

[2] A typical standby current for an intruder alarm circuit utilizing a dual element pyroelectric detec- tor is 300uA.

[3] The window size for 'a single element pyroelec- tric in...