Browse Prior Art Database

Express Charger

IP.com Disclosure Number: IPCOM000014588D
Original Publication Date: 2000-Aug-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Abstract

Disclosed is a battery charger for charging a battery with short time. The charger has constant current and constant voltage characteristics and it is possible to charge Li-Ion, Li-Polymer and Pb batteries which require constant voltage and constant current charging method. The constant voltage of charger is set to the maximum allowable voltage of battery, but the charging is terminated before the actual battery voltage reaches the maximum voltage for shortening charge time.

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Express Charger

   Disclosed is a battery charger for charging a battery with short
time. The charger
has constant current and constant voltage characteristics and it
is possible to charge
Li-Ion, Li-Polymer and Pb batteries which require constant
voltage and constant
current charging method. The constant voltage of charger is set
to the maximum
allowable voltage of battery, but the charging is terminated
before the actual battery
voltage reaches the maximum voltage for shortening charge time.

  Fig,1 shows the charging characteristics of the charger. At
first, the charger charges
a battery with constant current until the battery capaicty
reaches approximate 70%.

Then, the charger sets the charge mode to constant voltage
charging. The value of
charging current goes down after entering into constant voltage
mode. If value of
constant current reaches a predetermined value, the charging is
disabled and
battery voltage is measured. If the battery voltage is equal to
or higher than a
predetermined value which is slightly less than the maximum
allowable voltage,
the charging is terminated. In case the battery voltage does not
reach the
predetermined value, the charging is enabled and the charger
starts to charge the
battery again. If a predetermined time elapses, the charging is
disabled and battery
voltage is measured to check if it reaches the predetermined
value. Thus, enabling
and disabling the battery charging are repeated until actual
battery voltage
reaches predetermined value of voltage. In the res...