Direct battery-driven solar LED lighting using constant-power control

A direct battery-driven LED lighting technique using constant-power control is proposed in the present study. A system dynamics model of LED luminaire was derived and used in the design of the feedback constant-power control system. The test result has shown that the power of 18 W and 100 W LED luminaires can be controlled accurately with error at 2–5%. A solar LED street lighting system using constant-power and dimming control was designed and built for field test in a remote area. The long-term performance was satisfactory and no any failure since the installation. Since no high-power capacitor is used in the present constant-power control circuit, a longer lifetime is expected.

► We develop a battery-driven LED lighting technology using constant-power control.
► The constant-power control performs well.
► A solar LED lighting system using constant-power and dimming control was built.
► The long-term system performance was satisfactory.