| abstract |
A corona igniter ( 20 ) includes an ignition coil ( 26 ) providing a high voltage energy to an electrode. The coil ( 26 ) is disposed in a housing ( 34 ) and electrically isolated by a coil filler ( 36 ) and a capacitance reducing component ( 38 ) which together improve energy efficiency of the system. The coil filler ( 36 ) includes an insulating resin permeating the coil ( 26 ). The capacitance reducing component ( 38 ) has a permittivity not greater than 6, for example ambient air, pressurized gas, insulating oil, or a low permittivity solid. The capacitance reducing compound ( 38 ) surrounds the coil ( 26 ) and other components and fills the remaining housing volume. The coil filler ( 36 ) has a filler volume and the capacitance reducing component ( 38 ) has a component volume greater than the filler volume. |