Method and mechanism to prevent corruption of data

Details Method and mechanism to prevent corruption of data Method and mechanism to prevent corruption of data

2000-12-15

2001-11-13

Wong, Peter S. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With thermal condition detection

C320S137000

Reexamination Certificate

active

06316916

ABSTRACT:

TECHNICAL FIELD
The present invention relates to electronic circuits and, more specifically, to electronic circuits employed in battery chargers.
BACKGROUND
Many “smart” battery units include a battery and a device that gives information about the battery to such devices as battery chargers and other host devices that are powered by the battery (e.g., radios, telephones, etc.). One such device is a code resistor that identifies characteristics of the battery. The value of a code resistor may be determined by the battery charger, based on a current supplied to bias the code resistor and the voltage sensed across the code resistor. A smart battery unit might also include a battery monitor circuit that provides information to the host device during use.
Existing smart battery units allow the code resistor to be connected to the host device when the battery unit is also connected to a battery charger. Current to the code resistor could be supplied by both the battery charger and the host device. This results in a voltage across the code resistor being sensed by the battery charger that is different from the expected voltage for a given battery type. This can cause the battery charger to go off-line or to attempt to charge the battery in an incorrect manner.
Therefore, there is a need for a circuit that isolates a code resistor in a battery unit from a load when the battery unit is also connected to a battery charger.


REFERENCES:
patent: 5444378 (1995-08-01), Rogers
patent: 5754027 (1998-05-01), Oglesbee et al.
patent: 6181103 (2001-01-01), Chen

Affiliated with

Also associated with

Rating

Method and mechanism to prevent corruption of data does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and mechanism to prevent corruption of data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and mechanism to prevent corruption of data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2610887