F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
317/5.3
F02P 1/08 (2006.01) F02P 9/00 (2006.01)
Patent
CA 1170709
ABSTRACT An ignition system of the contactless interrupt type for an internal combustion engine is disclosed with a control circuit including a pair of solid state semiconductor devices with one connected to the other in a controlling relation. The ignition system has a high voltage transformer with a secondary winding coupled to a spark plug and a primary winding shunted by the controlled one of the pair of semiconductors. A current flow is induced in the primary winding and then interrupted near its maximum value by rendering both of the semiconductor devices nonconducting. The controlling semiconductor may be a gate controlled switch or so-called gate turn-off device while the controlled semiconductor may be a power transistor. The primary winding current flow is induced by movement of a flywheel supported permanent magnet past the high voltage transformer while the current interrupt feature includes a control coil coupled to the controlling semiconductor and positioned close to the high voltage transformer to be influenced by the permanent magnet motion.
382355
Macrae & Co.
Tecumseh Products Company
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