Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1997-04-18
1999-01-19
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
180271, 180272, 2807281, 280734, 701 45, B60R 2132
Patent
active
058616810
ABSTRACT:
An occupant crash protection device for a vehicle has: a current limiting circuit which receives a supply of a trigger signal generated when it is judged that a significant accident happens, and which controls a squib firing current to have a constant amount; a squib; and a mechanical acceleration switch, the current limiting circuit, the squib, and the acceleration switch being connected in series between terminals of a direct current power source. In the device, the current limiting circuit has: a first n-channel field effect transistor which is connected in series to the squib; a second n-channel field effect transistor which is connected in parallel to the first n-channel field effect transistor and which receives a minute amount of a current obtained by shunting the squib firing current which is to flow through the first n-channel field effect transistor; and bias control means for, in synchronization with the squib firing current, comparing the amount of the current flowing through the second n-channel field effect transistor with a reference amount, and controlling a gate voltage so that the amount of the current flowing through the first n-channel field effect transistor has an amount proportional to the reference amount.
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Wrathall, Robert S.; "The Design of A High Power Solid State Automotive Switch in CMOS-VDMOS Techonology"; IEEE 16th Power Electronics Specialist Conf., pp. 229-233, 1985.
Nakano Takashi
Tominaga Tamotsu
Gaffin Jeffrey A.
Ganjian Peter
Kansei Corporation
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