Passive safety device for vehicles
AssigneeDenso Corporation
InventorHiroshi Hattori
Life of this patent
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Abstract
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.
Claims10
A passive safety device for vehicles comprising:
- a main power source;
- a backup power source that supplies voltage in place of the main power source when power supply from the main power source is interrupted;
- a switching element disposed between the main power source and a firing circuit;
- a drive circuit driving the switching element so that a predetermined voltage is supplied to the firing circuit;
- a power source for the drive circuit that is connected to the main power source and that supplies voltage to the drive circuit in place of the main power source when power supply from the main power source is interrupted,
- wherein the power source for the drive circuit is constructed of a capacitor charged by the main power source, the capacitor configured such that a voltage thereof drops more slowly than the voltage of the backup power source when power supply from the main power source is interrupted.
A device for enabling a safing operation during a vehicle collision, the device comprising:
- a first power source that supplies a source voltage in place of a main power source when a power supply from the main power source is interrupted;
- a switching element disposed between the main power source and a firing circuit, the switching element for driving the firing circuit during the safing operation;
- and
- a drive circuit driving the switching element so that a predetermined voltage is supplied to the switching element, the predetermined voltage higher than the source voltage, the predetermined voltage provided by a second power source connected to the main power source, the second power source supplying voltage to the drive circuit in place of the main power source when the power supply from the main power source is interrupted,
- wherein the second power source includes a capacitor charged by the main power source, the capacitor configured such that a voltage thereof drops more slowly than the source voltage when the power supply from the main power source is interrupted.
Dependencies are inferred from the claim text.