LED driving apparatus and LED lighting apparatus

摘要

An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q1 to be turned on and off, a ripple current reducer 3a that is connected in series with the LED load and reduces current ripples of the LED load, and a controller CNT that turns on and off the switching element according to a feedback voltage taken from a connection point of the LED load and ripple current reducer, thereby controlling the DC output power to a predetermined value.

主权项

1. An LED driving apparatus for converting AC input power into required DC output power and supplying the DC output power to an LED load, comprising:
a switching element to be turned on and off; a ripple current reducer connected in series with a cathode terminal of the LED load and configured to reduce current ripples passing through the LED load; and a controller configured to turn on and off the switching element according to a feedback voltage at a connection point of the cathode terminal of the LED load and ripple current reducer, thereby controlling the DC output power to a predetermined value, wherein the ripple current is a current variation caused by a voltage variation due to a pulsating current of one direction as the rectified AC input power.