| 摘要 |
To reliably provide ignition energy only to specific spark plugs (11, 12; 14, 15) of a multi-cylinder internal combustion engine (ICE), a double-E core has primary windings (6, 8) located on a main or central branch, and separate secondary windings (10, 13) located in shunt branches, each secondary winding being associated with respective spark plugs. The primary windings are so energized that, at any one time, only one of the primary windings is conductive. In accordance with the invention, permanent-magnet biasing magnets (18, 20) are located in air gaps in the shunt magnetic paths (17, 19), and so polarized that the flux generated upon current flow through the respective branches of the primary windings is counter the bias magnetization of the respective magnet (18, 20) in the respective shunt path (17, 19) on which the secondary winding (10, 13) is wound which is associated with the respectively energized primary winding (e.g. primary 6-secondary 10; upon energization of primary winding 6, the flux will oppose the flux on magnet 18).
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