Rf power amplifier system having an improved drive system

H - Electricity – 03 – F

Patent

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Details

H03F 3/217 (2006.01)

Patent

CA 2202748

An RF power amplifier is presented herein including an RF source for providing a train of RF pulses having a fixed frequency and wherein each pulse is of a fixed amplitude and duration. A bridge circuit includes a first circuit having a first transistor switching means for, when on, connecting a DC voltage source across a load for DC current flow therethrough in a first direction. The bridge circuit includes a second circuit including a second transistor switch for, when on, connecting the DC voltage source across the load for DC current flow therethrough in a second direction. A switch driver control serves, when enabled, to pass the RF pulses for driving the first and second transistor switches on and off at a frequency dependent upon that of the RF signal and in such a manner that current from the DC voltage source alternately flows in the first and second directions through the load.

Un amplificateur de puissance HF comprend une source HF pour émettre un train d'impulsions HF ayant une fréquence fixe, chaque impulsion ayant une amplitude et une durée fixes. Un montage en pont comporte un premier circuit ayant un premier moyen de commutation par transistor pour, quand il est fermé, connecter une source de tension en courant continu aux bornes d'une charge pour y permettre la circulation du courant continu dans un premier sens. Le montage en pont comporte un second circuit comprenant un second commutateur à transistor pour, quand il est fermé, connecter la source de tension en courant continu aux bornes de la charge pour y permettre la circulation du courant dans une seconde direction. La commande du pilotage du commutateur, quand elle est activée, fait passer les impulsions HF de commande de fermeture et d'ouverture des premier et second commutateurs à transistor, à une fréquence qui dépend de celle du signal HF et qui est choisie de manière à ce que le courant de la source de tension en courant continu circule de manière alternée dans les première et seconde directions à travers la charge.

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