This UK-based engineering company moved from fluorescent ballasts to LED drivers and never looked back.
We've been discussing driver design and tradeoffs lately. Now Electronics Weekly brings us an in-depth interview with a principal engineer at Harvard Engineering, who presented a driver-centric view of the LED ecosystem.
Writer Steve Bush interviewed Harvard's Ken Dale. Harvard was started in 1993 to manufacture ballasts for fluorescent lighting, but by 2009 was designing and turning out LED drivers under the CoolLED brand in its Yorkshire, England factory. (They still make some ballasts for fluorescent and HID.)
As we heard from TI's John Perry in the recent Design News webinar, driver makers have plenty of work. Luminaire manufacturers are getting adventurous and putting together "almost every conceivable series and parallel arrangement of LEDs" and requesting suitable drivers for them, according to Electronics Weekly.
Harvard now lists 28 models of drivers up to 150 Watts, providing 250 mA to 2.1 A, with variants both for building into luminaires (integral) and for external mounting (remote). The company still makes flying lead variants, but Dale said these designs are not as widely used in Europe.
Here are a few of the points that caught my interest:
There is more detail in the Electronics Weekly interview and I suggest it will repay your time in reading it.