Car coil feed having magnetic centre with secondary/primary coil wound around and high frequency impedance between magnetic screen/earth

摘要

The feed coil has a magnetic centre (10) with a high voltage output connected to a spark plug (8). A secondary coil (6) is wound around the magnetic centre, and a primary coil (2) is wound around the secondary coil. There is a high frequency impedance (25) between the magnetic screen (13) and earth.