Circuit device for igniting internal combustion engine and semiconductor device for igniting internal combustion engine
AssigneeFuji Electric Co., Ltd.
InventorsShoichi Furuhata, Shigeyuki Takeuchi, Tatsuhiko Fujihira
Life of this patent
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Abstract
A circuit is provided in which a voltage due to a minute current is applied to a gate terminal from a collector terminal when a collector voltage is higher than a gate voltage in an operation of current limitation. Thus, an increase in the collector voltage immediately after the operation of current limitation starts serves to boost the gate voltage. The boosted voltage suppress an abrupt increase in the collector voltage. When the collector voltage is reduced by oscillation, the action of boosting the gate voltage is lowered to suppress the reduction of the collector voltage.
Claims9
A circuit device for igniting an internal combustion engine, comprising:
- a battery serving as a power supply;
- a coil;
- an MOS gate structure transistor having a main terminal, a gate terminal, and an output terminal, connected in series with said coil;
- a coil current detector for detecting a coil current flowing in said coil;
- means for reducing a gate terminal voltage at said gate terminal of said MOS gate structure transistor to limit the coil current to a predetermined value;
- and
- means for applying a voltage from said main terminal of said MOS gate structure transistor to the gate terminal when the main terminal voltage is higher than the gate terminal voltage.
A circuit device for igniting an internal combustion engine comprising;
- a battery serving as a power supply;
- a coil;
- an MOS gate structure transistor having a main terminal, a gate terminal and an output terminal, connected in series with said coil;
- a coil current detection unit for detecting a coil current flowing in said coil;
- means for reducing a gate terminal voltage to limit the coil current to a predetermined value continuously;
- a detection circuit for detecting a voltage across the coil;
- and
- means for applying a voltage from said main terminal to said gate terminal and means for operating the applying means in response to a voltage applied to the gate terminal.
A circuit device for igniting an internal combustion engine which is a control device comprising:
- a battery serving as a power supply;
- a coil;
- an MOS gate structure transistor connected in series with said coil;
- a coil current detection unit for detecting a coil current flowing in said coil;
- and
- means for reducing a gate voltage to limit the coil current to a predetermined value continuously;
- wherein an operation point of said control device is set at a point with a small temperature change.
Dependencies are inferred from the claim text.