6
LITHIUM BATTERY TWO-STAGE SMART CHARGING
The two-stage “smart” charger continuously measures the battery voltage output and
regulates the amount of charge using two modes of operation: Bulk and Absorption mode.
CONVERTER MODES OF OPERATION
Understanding output voltages of a two-stage converter.
Figure 2
Figure 3
FLOAT MODE
The third mode of charging is what is called the “oat” charge. This mode is designed to pro
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vide a “trickle charge” to the battery after the system observes no signicant variations in current
draw over a long period of time. When in “oat” mode, the voltage will reduce from 13.6V to
13.2V and supply the “trickle charge” which helps to preserve the life of the battery while keeping
it charged and ready for use. A change in DC current will cause the converter to exit the mode
and return to the Absorption mode and then to Bulk mode if required.
Note: For a detailed explanation of the charging modes, please refer to our publication “Theory of
Operation”, document #AD-TD-0001-0.
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