Power supply suits LED street light applications
Power Integrations
HiperPLC power supply controller
Power Integrations has released an engineering report (DER-212) describing a 92 per cent efficient power supply for LED street light applications.
The design utilises Power Integrations' HiperPLC power supply controller, which is claimed to enable a cost-effective circuit design by combining power factor correction (PFC) and resonant (LLC) control functions on a single integrated circuit.
The design will be exhibited on the Power Integrations booth at LED Expo Korea, from 20-23May, and at LED Lighting Taiwan, from 10-12 June.
LEDs are emerging as the preferred street-lighting 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 colour 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 optimised for cost, with minimal consequences to the community lighting scheme.
Maintenance costs, and therefore the total cost of ownership, are also reduced due to the high reliability of LEDs compared to HPS lamps.
HiperPLC is designed to control AC-DC converters from 80 to 600W.
HiperPLC minimises 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 synchronisation of PFC and LLC controllers.
Synchronisation reduces the ripple in the bulk capacitors, which reduces capacitor operating temperature and extends the life of the power supply.
Support for HiperPLC is featured in PI Expert software version 7.1.4, an automated power supply design tool based on Power Integrations products.
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