High efficiency power converter

H - Electricity – 02 – M

Patent

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Details

H02M 3/337 (2006.01) H02J 1/10 (2006.01) H02M 3/335 (2006.01)

Patent

CA 2278250

A power converter nearly losslessly delivers energy and recovers energy from capacitors (C3, C4) associated with controlled rectifiers (Q3, Q4) in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches (Q1, Q2) in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers (Q3, Q4) are cross-coupled from opposite secondary transformer windings.

Cette invention se rapporte à un convertisseur de puissance qui délivre, pratiquement sans perte, de l'énergie et récupère de l'énergie de condensateurs (C3, C4) associés à des redresseurs (Q3, Q4) commandés dans un circuit d'enroulements secondaires, chacun des redresseurs commandés possédant un redresseur parallèle non commandé. Un premier et un second commutateurs primaires (Q1, Q2), montés respectivement en série avec le premier et le second enroulements primaires, sont mis sous tension pendant un temps de mise sous tension fixe, chacun pendant approximativement la moitié de la durée du cycle de commutation. Les durées de transitions commutées sont courtes par rapport aux durées de l'état passant et de l'état bloqué des redresseurs commandés (Q3, Q4). Les entrées de commande des redresseurs commandés sont couplées transversalement par rapport aux enroulements de transformateur secondaires opposés.

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