Patent ID: 6628007
Filing Date: 2003-09-30
Classification: B60R

Abstract:
An electric firing circuit for a motor vehicle occupant protection system, with at least two firing stages for triggering an occupant protection component firing in at least two stages, each firing stage having at least one firing pellet and a switching element which is connected in series with said firing pellet for control by a control device, and with a safety switch, which responds to a physical parameter and releases a current feed to at least one of the firing stages when a certain threshold value is exceeded, but otherwise blocks said feed, the second firing stage, provided for the firing of the second stage of the occupant protection component, being connected to an electronic safety switching element, the control terminal of which is coupled to the safety switch and placed into the switched-through state by the safety switch, and a holding circuit connected between the safety switch and the control terminal of the switching element, the holding circuit being activated and applying a driver signal to the control terminal with a certain minimum time period when the safety switch closes.