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Browse Prior Art Database

Battery Pulse Charging System

IP.com Disclosure Number: IPCOM000113405D
Original Publication Date: 1994-Aug-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Mito, T: AUTHOR [+2]

Abstract

Disclosed is a system for charging a battery. And, it has means to measure the value of charging or discharging current, and has ability to calculate battery capacity. Generally, trickle charging current is too small to measure. The system conducts pulse charging to complement battery self-discharging instead of trickle charging which is fixed and small current value. Pulse charging is done by turning on and off normal charging. And, the system can calculate battery capacity accurately since it measures pulse charging current instead.

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Battery

Pulse Charging System

      Disclosed is a system for charging a battery.  And, it has
means to measure the value of charging or discharging current, and
has ability to calculate battery capacity.  Generally, trickle
charging current is too small to measure.  The system conducts pulse
charging to complement battery self-discharging instead of trickle
charging which is fixed and small current value.  Pulse charging is
done by turning on and off normal charging.  And, the system can
calculate battery capacity accurately since it measures pulse
charging current instead.

      The Figure shows an example of pulse charging by this system.
This system has battery charging means and charging current is
unknown until it charges the battery actually.  Normal charging
completes at point (X).  And, it is continuous charging.  After
completing normal charging, the system starts pulse charging so that
it complements battery self-discharging and keeps battery capacity
full.  And, pulse charging works as if trickle charging which is
fixed and small charging current.  In this example, the battery is
assumed that 20 mA of trickle charging is required to complement
self-discharging.  Even if the system cannot sense 20 mA of trickle
charging, it has an ability to measure value of normal charging
current.  In case of that the first pulse current is 2 amperes for 2
seconds, the system stops charging for 198 seconds.  When the second
pulse current is 3 amperes for 2...