公开(公告)号：JPH1067296A

公开(公告)日：1998-03-10

申请号：JP18771797

申请日：1997-06-26

Applicant: MOTOROLA INC

Inventor： BENNETT PAUL T ,  GRAY RANDELL C

IPC: B60R21/16 ,  B60R21/01 ,  B60R21/32

Abstract: PROBLEM TO BE SOLVED: To provide an air bag expansion system to generate and supply an electric current suitable for activation of a fuse and expansion of an air bag. SOLUTION: An air bag expansion system activates a fuse 74 and generates an electric current suitable to expand an air bag. A separate capacitor 48 feeds electricity to a circuit of a drive limiting control device 54 and supplies variable voltage drive to an MOS element 68 to regulate an ignition electric current of the fuse 74. A switch circuit 38 supplies gate voltage to a transistor 46 so that a capacitor 22 comes to be able to charge the capacitor 48 through an electrical connection route. The switch circuit 38 givee electrical insulation between damping voltage accumulated in the capacitor 22 to feed an electric current of the fuse 74 and the capacitor 48 to regulate an electric current to the fuse 74 from the drive limiting control device 54.