Data brief
For further information contact your local STMicroelectronics sales office.
August 2010 Doc ID 17833 Rev 1 1/4
4
STEVAL-ILL022V1
25 W LED street light with an 80 W solar energy
charger based on the STM32
Features
■ MPPT maximizes electricity conversion
efficiency from solar panels
■ Self-adapting charger for 12 V/24 V battery
■ Automatic day/night/weather detection
■ Automatic battery/mains switch over
■ Constant current control for LED lamps
■ Battery charge control
■ Optional LED lighting duration mode
■ Easy system-monitor via debug LED indicators
■ Full protection function for OTP, OCP, and
UVP
■ RoHS compliant
Description
The solar-LED streetlight controller is made up of
one 80 W battery charger and one 25 W LED
driver.
When the sun is present the charger converts the
electricity from the solar panel then charges the
battery. In a dark ambient where no sun is present
the battery powers on the LED lamp as a
streetlight. When wet or cloudy weather persists
for several days the battery gradually runs out of
power. The controller then switches on the AC
mains supply instead of the battery to power on
the LED until the battery is fully charged again.
STEVAL-ILL022V1
www.st.com
