Fast bidirectional analog switching system for hf pulses of...

H - Electricity – 03 – K

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H03K 17/04 (2006.01) H03K 17/74 (2006.01)

Patent

CA 2133073

The object of the disclosed system is the fast switching of high voltage and short duration pulses on loads which require high instantaneous intensities, in order to provide said pulses in both directions; the system is capable in switching narrow band signals, and therefore long duration signals. The system is based on a very low series impedance switching channel which is comprised of two high voltage capacitors in series with two rectifying groups connected in opposition and whose conduction status is activated by forced injection, through said groups, of a direct current controlled by a reactive network in series with a conventional low voltage unidirectional switch, thereby providing for its logical control from digital circuits TTL or CMDS. This system applies more particularly and immediately to wide band units which operate with high frequency radiations, particularly of ultrasonic type, and in fields such as diagnosis and non invasive medical treatment and non destructive tests or aeronautical and nuclear structures.

L'objet du système est d'effectuer la commutation rapide d'impulsions de haute tension et courte durée sur des charges qui sollicitent des intensités instantanées élevées, tout en permettant le passage de ces impulsions dans les deux sens; ce système est capable de commuter des signaux de bande étroite, et par conséquent de longue durée. Le système se base sur un canal de commutation de très faible impédance série, constitué par deux condensateurs de haute tension (C1) en série avec deux groupes redresseurs (GR1) et (GR2) connectés en opposition et dont l'état de conduction est activé par l'injection forcée à travers ces mêmes groupes d'un courant continu commandé par un réseau réactif en série avec un commutateur unidirectionnel de basse tension (CBP) de type classique, ce qui permet la commande logique (SL) de celui-ci à partir de circuits numériques TTL ou CMOS. Les applications immédiates de ce système sont les équipements de bande large qui utilisent des rayonnements de haute fréquence, en particulier de type ultrasonique, et également dans des domaines tels que le diagnostic médical et le traitement médical non invasif, ainsi que les tests non destructifs de structures aéronautiques et nucléaires.

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