US 12,476,475 B2
Igniter circuit having an adjustable over dwell time
Hirotada Honma, Tokyo (JP)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed on Jun. 20, 2023, as Appl. No. 18/338,278.
Prior Publication US 2024/0429727 A1, Dec. 26, 2024
Int. Cl. F02P 11/00 (2006.01); H01T 15/00 (2006.01); H02J 7/00 (2006.01); H03K 21/08 (2006.01)
CPC H02J 7/0063 (2013.01) [H01T 15/00 (2013.01); H03K 21/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving an input signal to configure a switching device in an ON condition, the switching device coupled in series with a coil;
starting a timer;
sensing a current in the coil after the switching device is configured in the ON condition;
measuring, based on the timer, a rise time corresponding to a time for the current to satisfy a criterion;
calculating a soft-shutdown delay based on the rise time; and
starting a soft-shutdown to reduce the current in the coil after the soft-shutdown delay.