Ignition control circuit with dual (two-stage) clamp
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United States of America Patent
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Jan 31, 2017
Grant Date -
Oct 8, 2015
app pub date -
Mar 27, 2015
filing date -
Apr 7, 2014
priority date (Note) -
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Abstract
In a general aspect, an apparatus can include an insulated gate bipolar transistor (IGBT) device configured to control charging and discharging of an ignition coil and a two-stage voltage clamp coupled with the IGBT device. The two-stage voltage clamp can include a high-voltage portion coupled with the IGBT device and a low-voltage portion coupled with high-voltage portion and the IGBT device. The apparatus can further include a sense device coupled with the two-stage voltage clamp and a timing circuit coupled with the sense device. The timing circuit can be configured to provide a control signal to cause the sense device to enable or disable the high-voltage portion of the two-stage voltage clamp.
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