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A low-cost, non-isolated AC/DC buck converter with no transformer

Posted: 11 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:power monitor? hysteretic buck controller? DC power rail?

Off-line equipment such as a smart meter or a power monitor has electronics that require non-isolated DC power under 10 W. Until recently, the only practical options for providing a low-power DC power rail from an AC source were to use an extremely inefficient, unregulated resistive/capacitive divider following the rectifier, or a flyback DC/DC converter that was cumbersome to design. Advances in MOSFET technology and an innovative gate-drive circuit for a hysteretic buck controller have resulted in an ultralow-cost DC power rail.

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