Patent ID: 7387115
Filing Date: 2008-06-17
Classification: F02P,H01T

Abstract:
1. A plasma ignition system for an engine comprising: an ignition coil for receiving a primary voltage and generating a secondary voltage higher than the first voltage based on the first voltage; a discharging power circuit including an igniter for controlling the ignition coil; a plasma generating power circuit including a plasma generating capacitor, which is charged by a voltage supplied thereto; an ignition plug mounted on the engine and having a cylindrical discharge space defined by a center electrode and a ground electrode, the ignition plug forming plasma gas in the discharge space by receiving the secondary voltage from the discharging power circuit and a plasma generating power form the plasma generating power circuit; a discharging wire connecting the discharging power circuit and the center electrode; a plasma generating wire connecting the plasma generating power circuit and the center electrode; and an electromagnetic noise reduction circuit including a first rectifier, a second rectifier and a noise reducing capacitor, wherein the first rectifier is disposed in the discharging wire to block a current flowing in the plasma generating wire from flowing into the discharging wire, the second rectifier is disposed in the plasma generating wire to block a current flowing in the discharging power wire from flowing into plasma generating power circuit, and the noise reducing capacitor is disposed in parallel to the second rectifier at a position between the plasma generating power circuit and the second rectifier.