Nearly a century later, driven by the desire to take a very significant step towards reducing the amount of energy we waste lighting our homes, offices, factories and municipal buildings, the US Congress has offered a $10 million prize for the first company able to develop a 60-watt incandescent lamp replacement using an LED in a standard A19 form-factor.
Designing a power supply that can efficiently drive the LED at the required brightness level, yet is small enough to fit into the normal bulb fitting, while still meeting EMC regulations, presents a huge challenge. This article describes a 10W power supply that is able run at over 91% efficiency while providing a constant LED current and meeting EMI requirements in a simple low cost design.
This article was published in the May/June 2008 issue of LEDs Magazine.
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