How it Works

A fast PWM output on the Charger is connected via a buck converter to the battery. By changing the duty cycle on the PWM, the voltage to the battery can be adjusted. To be able to measure voltage and current, two ADC pins is connected on both sides of a shunt resistor just before the battery.

The Charger continuously measures the voltage and current and adjusts the PWM output accordingly. The PWM is adjusted one step at a time and this will make it take approximately seven tenths of a second to go from minimum to maximum output. If either maximum current, maximum voltage or timeout is set to zero, charging will stop immediately.

When setting maximum current and voltage, the charging time in minutes is also set. This can be up to 255 minutes and the Charger will stop when the time is reached.

The HWB button on SB200 starts a charge cycle with a duration of 1 minute (or until you press it again). The charge voltage is set depending on which SB20x that is connected. This will also power up the SB20x, if it was off. The voltage, current, and timeout will be sent to the PC.