Direct current / direct current converter with multiple outputs

Details Direct current / direct current converter with multiple outputs Direct current / direct current converter with multiple outputs

H - Electricity

02

M

H02M 3/335 (2006.01)

Patent

CA 2654143

In a DC/DC converter comprising a transformer (10) having a primary winding Np and at least one first Ns1 and one second Ns2 secondary windings, a principal output channel connecting the first secondary winding to a principal output Vp and comprising a synchronous rectifier circuit, a first inductance L1 and a first capacitor C1, and an input channel connecting a DC supply voltage Ve to the primary winding and comprising a switching circuit (12) controlled by a pulse width modulator PWM1 for regulating the principal output voltage by switching the current in the primary winding, an auxiliary output channel is provided, connecting the second secondary winding to an auxiliary output Va and comprising an auxiliary rectifier circuit having a control switch M5, a free-wheel switch M6, a rectifier switch M3, a second inductance L2 and a second capacitor C2, and a second pulse width modulator PWM2 connected to the control M5 and free-wheel switches M6 for controlling a conduction interval of these switches in order to regulate the auxiliary output independently from the principal output, the rectifier switch M3 being controlled in synchronism with the synchronous rectifier circuit of the principal channel.

Dans un convertisseur DC/DC comportant un transformateur (10) ayant un enroulement primaire Np et au moins un premier NsI et un second Ns2 enroulements secondaires, une voie de sortie principale reliant le premier enroulement secondaire à une sortie principale Vp et comportant un circuit redresseur synchrone, une première inductance L1 et un premier condensateur C1, et une voie d'entrée reliant une tension d'alimentation continue Ve à l'enroulement primaire et comportant un circuit de commutation (12) commandé par un modulateur d'impulsions en largeur PWM1 pour réguler la tension de sortie principale en commutant le courant dans l'enroulement primaire, il est prévu une voie de sortie auxiliaire reliant le second enroulement secondaire à une sortie auxiliaire Va et comprenant un circuit redresseur auxiliaire ayant un commutateur de commande M5, un commutateur de roue libre M6, un commutateur de redressement M3, une seconde inductance L2 et un second condensateur C2, et un second modulateur d'impulsions en largeur PWM2 relié aux commutateurs de commande M5 et de roue libre M6 pour commander un intervalle de conduction de ces commutateurs afin de réguler la sortie auxiliaire indépendamment de la sortie principale, le commutateur de redressement M3 étant commandé en synchronisme avec le circuit redresseur synchrone de la voie principale.

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