Switching power supply circuit

H - Electricity – 02 – M

Patent

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Details

H02M 3/338 (2006.01) H02M 3/335 (2006.01)

Patent

CA 2379089

A switching power supply circuit, which is small, lightweight, and highly efficient in power conversion, includes an insulating converter transformer, which is formed by a core with no gap and a primary and secondary winding wound on the core such that the mutual inductance between the windings exhibits an additive mode. A half-wave rectifier circuit is provided on the secondary side of the circuit and performs a rectification operation in the additive mode to obtain a secondary side DC output voltage. In a constant voltage control circuit system for stabilizing the secondary side output voltage, the switching frequency of a switching element is varied in response to the secondary side output voltage level to control the resonance impedance of a primary side parallel resonance circuit and the continuity angle of the switching element compositely.

Cette invention se rapporte à un circuit d'alimentation avec commutation, qui est de petite taille, léger et très efficace en conversion de puissance et qui comprend un transformateur convertisseur isolant, formé par une armature sans entrefer et un enroulement primaire et un enroulement secondaire enroulés sur l'armature, pour que l'inductance mutuelle entre les enroulements présente un mode additif. Un circuit redresseur à demi-onde est placé sur le côté secondaire du circuit et effectue une opération de redressement dans le mode additif, pour produire une tension de sortie CC du côté secondaire. Dans un système de circuit de commande de tension constante, destiné à stabiliser la tension de sortie du côté secondaire, la fréquence de commutation d'un élément de commutation est amenée à varier en réponse au niveau de tension de sortie du côté secondaire, pour commander l'impédance de résonance d'un circuit de résonance parallèle du côté primaire et l'angle de continuité de l'élément de commutation, en mode composite.

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