Power Integrations, the leader in high-voltage integrated circuits for energy-efficient power conversion, 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.
www.powerint.com