Simplified switch driver for inductive ignition

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

Patent

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F02P 9/00 (2006.01) F02P 3/00 (2006.01) F02P 3/04 (2006.01) F02P 3/09 (2006.01) F02P 7/03 (2006.01) H01F 38/12 (2006.01)

Patent

CA 2218295

A simple form of ignition driver and control circuit for the coil power switches of an inductive ignition system for setting and controlling the primary current Ipo in the coil primary windings (@ 3) of ignition coils (@ 2a, 2b) of a multi-cylinder engine with "n" powerswitchess S1 through Sn, the driver circuit being comprised of "n" isolation diodes with only one common control switch, a comparator (@ 10) and a common input trigger circuit working in conjunction a current sense circuit with partial temperature compensation and the comparator to set the power switch on-time duration, Tdw for sequentially energizing and de-energizing the ignition coils as dictated by an ignition spark firing and sequencing system.

L'invention concerne une forme simple de circuit d'excitation et de circuit de commande d'allumage pour commutateurs d'alimentation de bobines d'un système d'allumage inductif permettant de régler et de commander le courant primaire Ipo dans les enroulements primaires (@3) de bobines d'allumage (@2a, 2b) d'un moteur multi-cylindre présentant "n" commutateurs de puissance S1 à Sn. Le circuit d'excitation se compose de "n" diodes d'isolation ne présentant qu'un seul commutateur de commande commun, d'un comparateur (@ 10) et d'un circuit de déclenchement d'entrée commun fonctionnant conjointement avec un circuit de détection de courant à compensation partielle de température, et du comparateur afin de régler la durée de fonctionnement Tdw du commutateur de puissance pour alimenter et cesser d'alimenter séquentiellement les bobines d'allumage, selon ce que dicte un système d'allumage et de séquencement d'étincelles d'allumage.

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