NON-CONTACT CHARGER SYSTEM

Publishing Venue

Motorola

Related People

Abstract

In rechargeable devices the charging contacts can become corroded from exposure to air or salt water leading to poor contact and eventual failure of the device. For this reason the contacts are frequently gold plated, however the gold is soft and often wears off.

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Technical Developments Volume 10 March 1990

NON-CONTACT CHARGER SYSTEM

by Frederick L. Kampe, William J. Burke and Robert Wm. Wandelt

Abstract

   In rechargeable devices the charging contacts can become corroded from exposure to air or salt water leading to poor contact and eventual failure of the device. For this reason the contacts are frequently gold plated, however the gold is soft and often wears off.

   These problems are avoided by the use of a charging system that does not make direct electrical contact with the device being charged. Instead, the charger-base and rechargeable device are inductively coupled and the rechargeable device includes extra components to capture the AC field and convert it to DC for charging the battery(s).

This idea has application in any product with rechargeable batteries and specifically in the areas of Cordless or Cellular Phones, Two-way radios, Pagers and other portable devices.

BAnEFlY

BASE UNIT

PORTABLE UNIT

AIR GAP

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0 Motorola, Inc. 1990 73