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Highly efficient ultra-compact isolated DC-DC converter with fully integrated active clamping H-bridge and synchronous rectifier

Boekbijdrage - Boekhoofdstuk Conferentiebijdrage

An isolated forward DC-DC converter with monolithically integrated electronics at both sides of the pulse transformer is presented. It converts a 48V DC input voltage into a 12V DC output voltage at 7A load current with a 90.8% overall power efficiency, employing an 800kHz switching frequency, and it occupies a physical volume of 55mm x 35mm x 10mm only. The primary winding of the planar pulse transformer is driven by a new 4-transistor active clamping H-bridge circuit topology that significantly reduces the voltage requirements for the DMOS power devices, thereby enabling monolithic integration of the primary-side electronics in an 80V 0.35U+F06Dm junction-isolated smart-power IC technology. The switching signal at the secondary winding of the planar pulse transformer is converted into a stable DC output voltage by means of a new synchronous rectifier circuit topology that employs an additional DC-DC buck converter and drastically reduces the dynamic switching losses in the DMOS power devices, thereby boosting the power efficiency and enabling monolithic integration of the secondary-side electronics in an 80V 0.35U+F06Dm junction-isolated smart-power IC technology.
Boek: WSEAS Transactions on Systems
Volume: 15
Pagina's: 102 - 109
Toegankelijkheid:Closed