Application in battery charger

AN2389

10/16

4.2

Software flowchart

There are many ways in which you can control the operation of this circuit. An example

algorithm which can be used for in Li-ion battery charger is given below-

Figure 5.

Li-ion battery charger flowchart

INITIALIZE THE PWM

SIGNALS WITH DUTY

CYCLE D1 AND D2.

IS THERE

A OVERFLOW IN

D1?

No

YES

WORKS IN BUCK-BOOST MODE. KEEP D2

FIXED AND VARY D1 TO KEEP THE CURRENT

CONSTANT.

ALWAYS ON AND VARY THE D2 TO

-ING THE CURRENT OR VOLTAGE

END

WORKS IN BOOST MODE. KEEP SW1

CONTINUE THE ALGORITHM BY KEEP

CONSTANT AS REQUIRED.