Page 12 - PEN eBook October2023

Cover Story — Design

must be chosen to increase
the charge capacity and
decrease the charging periods

without increasing the battery
temperature or compromising
the battery life.

Implementing a multistage
CC battery-charging algorithm
provides better utilization of
the battery capacity. Once
the battery voltage reaches

the specified cutoff voltage,
Figure 5: Multistage constant-current battery-charging profile for a five-cell the charging current can be
10-Ah Li-ion battery
reduced by 40%, 20% and 6%
(this percentage of current
steps can be customized) of the rated current, respectively, when the terminal voltage reaches the
specified cutoff voltage.

EZ-PD™ PMG1-B1 also supports a smart-charging algorithm in which the MCU calculates the input
power available from the USB-C adapters, then periodically measures the battery output voltage
and dynamically updates the battery-charging current. This enables maximum utilization of the
available input USB-C power. Figure 5 shows an EZ-PD™ PMG1-B1–based multistage battery-charging
profile of a five-cell lithium-ion battery with support for the smart-charging algorithm. Notice the
battery current is periodically
updated as the measured
battery voltage increases.

MIXED CC- & CV-
MODE CHARGING
ALGORITHM

In this method, the charging
starts with CC mode, and
when the battery terminal
voltage reaches the maximum

safe threshold value, the
charging mode transfers to
the CV charging method.
The charging process is
completed when the charging Figure 6: CC- and CV-mode charging profile for a five-cell 10-Ah Li-ion
battery

12 OCTOBER 2023 | www.powerelectronicsnews.com