Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
1999-12-21
2001-07-24
Wong, Peter S. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S165000, C324S427000
Reexamination Certificate
active
06265849
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electrical apparatus having supply terminals to be supplied by a battery. The invention also relates to a method of detecting the disconnection of a battery.
DESCRIPTION OF THE RELATED ART
Such apparatus are well known and find many applications, notably in the field of portable telephony devices which are supplied with power by a battery whose state of charge makes it necessary to be controlled very well.
U.S. Pat. No. 5,349,280 describes a circuit intended to protect a battery among several others.
SUMMARY OF THE INVENTION
The present invention proposes an apparatus in which charge or discharge measurements of the battery are made. However, these measurements may be made wrong if the battery is changed by the user for a variety of reasons.
Thus, by the invention one is assured that the state of charge and/or discharge of the battery is well known, which ensures a longer useful life for these elements, because they can be charged advisedly.
To avoid distorting the charging and/or discharging measurements of a battery when it is changed, such an apparatus is characterized in that it includes a detecting circuit for detecting a change of battery.
REFERENCES:
patent: 4714868 (1987-12-01), Maruyama et al.
patent: 5349280 (1994-09-01), Kim
patent: 5631538 (1997-05-01), Komrska
patent: 5793186 (1998-08-01), Watabe
patent: 5828202 (1998-10-01), Tamai
patent: 5949220 (1999-09-01), Ide et al.
patent: 6043626 (2000-03-01), Snyder et al.
patent: 2270445A (1994-03-01), None
Slobod Jack D.
Toatley , Jr. Gregory J.
U.S. Philips Corporation
Wong Peter S.
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