Power

Power Integrations' 92%-Efficient Power Supply for LED Streetlights up to 150 W

20th May 2009
ES Admin
Power Integrations has released a new engineering report (DER-212) describing a 92%-efficient power supply for LED streetlight applications. The design utilizes Power Integrations’ HiperPLC power supply controller, which enables a simple, cost-effective circuit design by combining power factor correction (PFC) and resonant (LLC) control functions on a single integrated circuit.
LEDs are rapidly emerging as the preferred streetlighting technology, displacing traditional technologies such as high pressure sodium (HPS) lamps. LEDs consume far less electricity for each lumen of useful light emitted, delivering as many as 80 lumens per watt when driven by a high-efficiency resonant power supply, versus just 58 lumens per watt for HPS lamps. In addition, LEDs provide better directional control and color quality than HPS lights, an important consideration in shopping and residential areas. LEDs can also turn on and off instantly and retain their efficiency when dimmed – features well suited to automated sensing of ambient light and human activity, allowing light output to be optimized for cost, with minimal consequences to the community lighting scheme. Maintenance costs, and therefore the total cost of ownership, are also significantly reduced due to the intrinsically high reliability of LEDs compared to HPS lamps.

HiperPLC, Power Integrations’ first high-power product, is designed to control AC-DC converters from 80 to 600 watts. HiperPLC minimizes costs by reducing the size of the PFC magnetics required, and by combining the PFC and LLC controllers into a single IC. The IC provides up to 0.99 power factor and features synchronization of PFC and LLC controllers. Synchronization reduces the ripple in the bulk capacitors, which reduces capacitor operating temperature and significantly extends the life of the power supply. Support for HiperPLC is now featured in Power Integrations’ PI Expert software (version 7.1.4), an automated power supply design tool based on PI products.

Comments Doug Bailey, Power Integrations’ vice president of marketing: “Municipalities around the world are finding that LEDs offer a greener, more economical approach to streetlighting by saving both energy and maintenance costs.

However, these benefits cannot be fully realized without a highly efficient, reliable power supply driving the LEDs. With HiperPLC, designers can produce a simple, reliable, cost-effective, power supply with efficiency as high as 92%.”

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