The solar-powered LED lighting system has been commercialized for a long time. The system usually consists
of a DC to DC converter in order to convert the battery voltage into a fixed voltage or current for the LED lighting
luminaire. This will cause energy loss and system reliability due to the failure of DC/DC converter. In the present study,
we develop a special technique to drive the LED luminaire directly from battery utilizing PWM technique in order to
remove the DC/DC converter. However, instantaneous current overdriven can occur easily due to the variation of
battery voltage with the state-of-charge of battery.
In the present study, we setup a thermal chamber with temperature variation to within 40±3°C. A LED luminaire
was specially designed for the LED reliability test with four different circuits with each circuit connecting three LED
lamps serially. A driver is designed to provide 4 kinds of power inputs to LED: (a) 350mA constant current, (b)
700mA,100Hz, duty cycle=50%, (c)700mA, 10K Hz duty cycle=50% and (d) 1050mA, 100Hz, duty cycle=33%. The
tests were performed simultaneously to compare light decay between normal drive condition (a) and other PWM
driving conditions (b, c, d). The accumulated total test time so far is more then 7,032 hours and has shown no
significant light decay in 4 different loops. This reveals that the PWM technique directly driven by battery is feasible
and is able to reduce energy loss of DC to DC converter in the solar lighting system.