Appeal No. 1998-1444 Page 2
Application No. 08/543,933
circuit and for controlling charging according to the detected
voltage difference.
To account for variations in the optimum charging voltage
of a battery varies with respect to ambient temperature, the
inventive reference voltage generating circuit produces a
reference voltage that changes linearly with changes in
temperature. Figure 2 of the specification shows the
inventive circuit. More specifically, a constant voltage
power supply 1 supplies an output voltage V between a first
cc
output terminal and a grounded, second output terminal. A
voltage divider circuit, which comprises serially-connected
resistors R and R , is connected between the first output1 2
terminal and ground. A constant current source 2 is connected
to a voltage divider junction 3, viz., the junction between
the resistors R and R , and ground. Because the constant1 2
current source 2 produces a linear change with temperature in
the current I flowing into or out of the voltage divider
1
junction, which functions as an output terminal, a reference
voltage V that linearly changes with temperature is output.
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Last modified: November 3, 2007