Ignition device for internal combustion engine
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United States of America Patent
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Jul 16, 2013
Grant Date -
Mar 15, 2012
app pub date -
Jan 26, 2011
filing date -
Sep 15, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A power circuit, which supplies plasma energy to a spark plug, includes a DC/DC converter which charges a tank capacitor, a voltage limiting circuit which restricts an output voltage of the converter to a predetermined value, a PJ capacitor which is connected to the output side of the converter and is charged by the tank capacitor, and a high breakdown voltage switch which is connected between the PJ capacitor and the DC/DC converter and controls a charging time period of the PJ capacitor in response to operating conditions of an internal combustion engine; and the power circuit switches a voltage limiting value of the tank capacitor for charging the PJ capacitor in synchronization with a driving signal of the high breakdown voltage switch.
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