Apparatus and method for driving LED

摘要

A light emitting diode (LED) driving apparatus may include: a rectifying unit providing a rectified voltage; an LED array including at least one LED string including first to nth LEDs connected in series; a sink path controller providing first to (n−1)th sink path control signals according to a level of the rectified voltage; a sink path switching circuit unit including first to (n−1)th sink path switches performing a switching operation according to each of the first to (n−1)th sink path control signals; a voltage phase controller generating a phase-adjusted voltage; a source path controller providing first to (n−1)th source path control signals; and a source path switching circuit unit including first to (n−1)th source path switches performing a switching operation according to each of the first to (n−1)th source path control signals.

主权项

1. A light emitting diode (LED) driving apparatus, comprising:
a rectifying unit rectifying an alternating current (AC) voltage to provide a rectified voltage; an LED array including at least one LED string connected to an output terminal of the rectifying unit, the LED string including first to nth LEDs connected in series; a sink path controller providing first to (n−1)th sink path control signals according to a level of the rectified voltage; a sink path switching circuit unit including first to (n−1)th sink path switches respectively connected to cathodes of the first to (n−1)th LEDs and a ground, each of the first to (n−1)th sink path switches performing a switching operation according to each of the first to (n−1)th sink path control signals to change a closed circuit path; a voltage phase controller generating a phase-adjusted voltage having a phase different from that of the rectified voltage; a source path controller providing first to (n−1)th source path control signals according to a level of the phase-adjusted voltage; and a source path switching circuit unit including first to (n−1)th source path switches respectively connected between anodes of the second to nth LEDs and a phase-adjusted voltage terminal of the voltage phase controller, each of the first to (n−1)th source path switches performing a switching operation according to each of the first to (n−1)th source path control signals to change a closed circuit path.