| 摘要 |
A passive safety device for vehicles to ensure the characteristics of a power source for a drive circuit and further simplify circuitry and reduce costs is provided. An airbag device includes a battery, a voltage converter, a backup power source, a FET driver circuit, a FET, and a power source for the FET driver circuit. The driver circuit power source includes capacitors, the capacitance of which are so set that, when the output voltage is interrupted, the voltage of the driver circuit power source more gently drops than that of the backup power source 4 , making it unnecessary to use a charge pump circuit.
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