Capacitive discharge ignition system with self-triggering...

F - Mech Eng,Light,Heat,Weapons – 02 – P

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F02P 15/00 (2006.01) F02P 3/08 (2006.01) F02P 7/03 (2006.01) H01L 29/74 (2006.01) H01L 29/86 (2006.01) H01L 29/87 (2006.01) H03K 3/57 (2006.01)

Patent

CA 2122249

A capacitive discharge ignition system is described that incorporates a two-terminal passive network for controlling the discharge of a capacitive energy storage device into an igniter plug, wherein the network comprises a solid-state switch for alternately providing high and low ohmic paths between the two terminals in order to selectively connect the capacitive energy storage device to the igniter plug. The passive network includes means responsive to a predetermined value of a voltage differential between the two terminals for effecting the switching of the path between the two terminals provided by the solid-state switch from a high ohmic value to a low ohmic value, thereby controllably discharging the capacitive energy storage device into the igniter plug. In the illustrated embodiment, the solid-state switch is a series of SCRs, each of whose anode is connected to the trigger input of the SCR by way of a breakover diode.

Dispositif d'allumage à décharge capacitive intégrant un dipôle passif pour contrôler la décharge d'un dispositif de stockage d'énergie capacitive dans une bougie d'allumage. Le dipôle comprend un commutateur transistorisé permettant de fournir en alternance des trajets ohmiques élevés et faibles entre les deux bornes, afin de relier de façon sélective le dispositif de stockage d'énergie capacitive à la bougie d'allumage. Le dipôle passif comporte une fonction répondant à une valeur prédéterminée de différence de tension entre les deux bornes, permettant d'effectuer la commutation du trajet entre les deux bornes par le commutateur transistorisé d'une valeur ohmique élevée à une valeur ohmique faible. Le dispositif de stockage d'énergie capacitive est ainsi déchargé de façon contrôlée dans la bougie d'allumage. Selon le modèle illustré, le commutateur transistorisé constitue une série de thyristors, dont chaque anode est reliée à une puissance absorbée de déclenchement de thyristor au moyen d'une diode à quatre couches.

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