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Power/Alternative Energy  

Two-transistor forward topology for 80 PLUS efficient power supplies

Posted: 04 Oct 2007     Print Version  Bookmark and Share

Keywords:ATX  80 PLUS  MOSFET 

ATX power-supply designers tend to favor single-switch forward-converter topologies because they are simple and can power multiple, isolated outputs. However, the drawback of these approaches is that the voltage stress on the transistor is the sum of the bus voltage, the reflected transformer voltage, and the turn-off leakage-inductance spike.

The new energy-saving program by the United States Environmental Protection Agency (EPA), called 80 PLUS, breaks this trend, and introduces higher efficiency and more stable regulations, along with new topologies. Efficiency immediately comes into conflict with BOM cost. From the start, designers must consider a second high-side transistor switch where the voltage stress is reduced, and where the added complexity and component count is a small price to pay for the benefits that are received. Therefore, the two-transistor forward-converter topology cost effectively improves the efficiency to reach the 80 PLUS requirements in ATX supplies, by using a new high-voltage MOSFET technology.

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