An alternate way of driving LEDs

Several lighting manufacturers have recently incorporated AC-driven LEDs into their lighting fixtures. Tim Whitaker looks at this emerging technology.

May 15th, 2008
Content Dam Leds En Articles Print Volume 5 Issue 4 Features An Alternate Way Of Driving Leds Leftcolumn Article Thumbnailimage File
Most LEDs are designed to be driven by a DC current, and LED systems are built accordingly. However, with the correct design at the device or circuit level, it is also possible to drive certain LEDs with an alternating current.

One obvious advantage of this approach is the elimination of the otherwise essential AC-DC converter, which converts line (AC) voltage down to low (DC) voltage. (Note that LED replacement lamps, although plugged directly into an AC light socket, usually contain converter circuitry within the lamp so that the LEDs themselves are driven by a DC current.

AC-driven LEDs have been available for more than a year, and lighting manufacturers are now starting to take advantage. Nexxus Lighting recently introduced what it claims is the industry’s first LED floodlight for general illumination that operates directly from line voltage (i.e. 120V AC), without the need for an internal or external power supply. The SAVI™ SHO White floodlight is intended for interior and exterior applications, and contains a total of 17 Seoul Semiconductor 4-watt Acriche LEDs.

+++++++

This article was published in the April 2008 issue of LEDs Magazine.

To read the full version of this article, please visit our Magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine.

You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter.

More in Home