Patent ID: 8676448

Claim:
An occupant protection device comprising: an electronic control unit including a control board, the control board including an interface having a communication circuit to conduct a power line superposed communication, and a processor connected to the interface and configured to make a collision determination; a parallel connection bus having two lines, wherein a base portion of the parallel connection bus is connected to the electronic control unit, wherein the parallel connection bus is supplied with a sensor drive voltage; a plurality of satellite sensors connected to the parallel connection bus for collision detection, wherein each of the satellite sensors includes a distributed system interface which is located between the two lines; a squib connected to the parallel connection bus and configured to start to operate at least one of occupant protection portions by an ignition voltage which is reverse polarity to the sensor drive voltage; and an accident prevention diode located in vicinity of the squib and connected in series with the reverse polarity to the sensor drive voltage, wherein the electronic control unit starts to operate at least one of the occupant protection portions based on a result of the collision determination by the control board, and the electronic control unit includes an ignition switching element which applies the ignition voltage for the squib through the parallel connection bus.