Boost converter with reduced switching loss

G - Physics – 05 – F

Patent

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Details

G05F 1/10 (2006.01) H02M 3/156 (2006.01)

Patent

CA 2354541

A low power loss boost converter (10) of the discontinuous conduction type includes an inductor (18) coupled between the boost converter (10) input and a junction, a current rectifier (20) coupled between the junction and the converter output, a switch (30) coupled between the junction and common, and a switch capacitor (46) coupled in parallel with the switch (30), the inductor (18) and an energy storage capacitance (40) associated with the input. The switch (30) is alternately opened and closed in switching cycles which alternately energize the inductor (18) and transfer the energy to the output load. Power losses are reduced by providing switch closure at a near zero voltage and current switch conditions produced by a circuit resonance. The capacitor (46) reduces voltage across the switch during the switch open transient condition.

L'invention concerne un convertisseur élévateur de tension à perte de commutation réduite (10) du type à conduction discontinue, qui comporte une bobine d'inductance (18) couplée entre l'entrée de l'élévateur de tension (10) et une jonction, un redresseur de courant (20) couplé entre la jonction et la sortie du convertisseur élévateur de tension, un commutateur (30) couplé entre la jonction et la ligne commune, et un condensateur de commutateur (46) couplé en parallèle avec le commutateur (30), la bobine d'inductance (18) et une capacité de stockage d'énergie (40) associée à l'entrée. Le commutateur (30) est alternativement ouvert et fermé dans des cycles de commutation qui excitent en alternance la bobine d'inductance (18) et transfèrent l'énergie vers la charge de sortie. Les pertes d'énergie sont réduites par la fermeture du commutateur à des conditions de tension et de courant proches de zéro produites par une résonance de circuit. Le condensateur (46) réduit la tension au commutateur au cours de l'état transitoire ouvert du commutateur.

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