US 10,892,613 B2
Squib circuit high side battery short protection
Vincent Colarossi, Dearborn Heights, MI (US); and Bankim Patel, Canton, MI (US)
Assigned to VEONEER US, INC., Southfield, MI (US)
Filed by Autoliv ASP, Inc., Ogden, UT (US)
Filed on Dec. 20, 2017, as Appl. No. 15/849,466.
Prior Publication US 2019/0190248 A1, Jun. 20, 2019
Int. Cl. H02H 3/14 (2006.01); B60R 21/017 (2006.01); H02H 1/00 (2006.01); H02H 7/20 (2006.01)
CPC H02H 3/14 (2013.01) [B60R 21/017 (2013.01); H02H 1/0007 (2013.01); H02H 7/20 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A squib driver circuit for deployment of an active safety restraint in a vehicle, the squib driver circuit being an integrated circuit formed on a single chip comprising:
an input terminal for receiving an input voltage used to fire the active safety restraint;
a high side feed terminal configured for communication with the active safety restraint;
a low side return terminal configured for communication with the active safety restraint;
a high side driver configured to supply current from the input terminal to the high side feed terminal;
a low side driver configured to supply current from the low side return terminal to the electrical ground; and
a high side short to battery voltage protection circuit configured to allow an all fire signal from the high side feed terminal until a short is detected between the high side feed terminal and a battery voltage for a predetermined period of time and disable the high side driver after the short is detected and elapse of the predetermined period of time;
wherein the high side short to battery voltage protection circuit comprises a comparator circuit to compare the input voltage to a reference voltage to determine if the high side terminal is shorted to the battery voltage.