Switching power supply apparatus and method

H - Electricity – 02 – M

Patent

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Details

H02M 3/24 (2006.01) H02M 3/335 (2006.01) H02M 7/44 (2006.01) H02M 7/537 (2006.01)

Patent

CA 2209186

A switching power supply (100) having a power steering clamp (116) is disclosed. The power supply (1()D) may suitably include a pulse width modulator controller which controls a first switch for controlling the flow of energy into and out of a transformer (120). The power steering clamp (116) suitably includes a second switch, clamp diodes, and circuitry for driving the gate of the second switch. The circuitry for driving the gate of the second switch is preferably controlled by the pulse width modulator controller. Use of the power steering clamp (116) permits leakage energy to be rerouted subsequently to the transformer. This feature may improve the efficiency of the circuit and also avoids the need for heat sinks to prevent overheating of circuit components. Such a switching power supply (100) is particularly suitable for use in high density devices, such as a banknote or bill validator.

Une alimentation d'énergie de commutation (100) possède un verrou de pilotage d'énergie (116). L'alimentation d'énergie (100) peut comprendre un dispositif de commande de modulation d'impulsion en largeur qui commande un premier commutateur pour commander l'entrée et la sortie du flux d'énergie dans et hors du transformateur (120). Le verrou de régulation d'énergie (116) comprend un second commutateur, des diodes de verrouillage, et un circuit pour commander la porte du second commutateur. Le circuit de commande de la porte du second commutateur est commandé de préférence par le dispositif de commande du modulateur d'impulsion en largeur. L'utilisation du verrou de régulation d'énergie (116) permet le réacheminement ultérieur de l'énergie de fuite vers le transformateur. Cette caractéristique peut améliorer le rendement du circuit et éviter aussi d'avoir recours à des puits thermiques pour empêcher la surchauffe des composants du circuit. Une telle alimentation d'énergie de commutation (100) est particulièrement appropriée aux dispositifs de haute densité tel qu'un dispositif de validation de billets de banque.

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