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Increasing low power converter efficiency with resonant snubbers

Posted: 13 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power converter? resonant snubber? energy efficiency? application note?

With energy requirements and costs constantly increasing, the demand for efficient power supplies obviously increases. Energy Star efficiency requirements for power conversion equipment are pretty much becoming the norm in the industry and world wide, and prospects indicate evolving and even tighter efficiency requirements in the future. The real problem in meeting the efficiency requirements has been in the low power realm of linear supplies where, in many cases, no hope at all exists in meeting them. As a consequence, off-line switchmode supplies are now rapidly replacing linear supplies and transformer "wallwarts" at low power levels even as low as a watt. This is evident in cell phone chargers, small STB supplies, modems and in commercial equipment such as garage door openers and white goods. However, designing switchmode supplies to meet the Energy Star requirements at low power levels is not easy.

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