Patent ID: 6731023
Filing Date: 2004-05-04
Classification: H02J

Abstract:
A backup power supply system for a restraint control module, comprising:a main power source connected to a backup power source charging circuit and said restraint control module; a backup power source connected to said backup power source charging circuit and said restraint control module; a boost converter control and driver circuit connected to a boost converter switching device that is connected to said backup power source charging circuit, wherein said boost converter control and driver circuit turns said boost converter switching device on and off at a predetermined duty cycle to charge said backup power source with said backup power source charging circuit during normal power operation; and a backup power supply control and driver circuit connected to a backup power supply switching device that is connected to said backup power source, wherein said backup power supply control and driver circuit uses said backup power supply switching device to switch the source of power to said restraint control module from said main power source to said backup power source during a loss of power from said main power source.