Driving circuit for crew protecting system
AssigneeDenso Corporation
InventorMasahiko Ito
Life of this patent
Estimating the term…
Abstract
A driving circuit for a crew protection device to be mounted in a vehicle includes a squib for operating the protection device when a preset amount of electric current is supplied thereto from the DC power source, a pair of first and second transistors connected between the squib and the DC power source, and a transistor control circuit. The transistor control circuit controls the first transistor to pass a first preset amount of electric current if output voltage of the DC power source is higher than a first threshold voltage and to pass an amount of electric current so that the voltage across the first transistor can be set to be lower than a second threshold voltage if output voltage of the DC power source becomes higher than the threshold voltage.
Claims7
A driving circuit for a crew protection device connected to
- a DC power source and mounted in a vehicle comprising:
- a squib for operating the protection device when a preset amount of electric current is supplied thereto from said DC power source;
- a first transistor connected between one end of said squib and one end of said DC power source;
- a second transistor connected between the other end of said squib and the other end of said DC power source;
- and
- transistor control means for controlling said first transistor when a command signal is given thereto;
- wherein said transistor control means controls said first transistor to pass a first preset amount of electric current if output voltage of said DC power source is higher than a first threshold voltage and to pass an amount of electric current so that the voltage across the first transistor can be set to be equal to or lower than a second threshold voltage if output voltage of said DC power source becomes higher than the threshold voltage.
Dependencies are inferred from the claim text.