Achieving Five-Star Energy Efficiency in Cell- Phone Chargers

摘要

As product designers are keenly aware, regulators in the US and EC have been busy proposing minimum efficiency requirements for offline power supplies. The first round of regulatory requirements tackles external power supplies, such as those that recharge mobile devices.rnAt around 70%, the minimum acceptable efficiency during device operation is not hard to meet. Similarly, today's 250- to 300-mW requirements for no-load power dissipation are easy to accommodate, as is the EC's 150-mW specification that begins in 2011. But the 30-mW no-load target representing the new five-star rating system agreed upon by LG Electronics, Motorola, Nokia, Samsung, and Sony Ericsson entirely changes this landscape (see Table).