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US 2003/0116149 A1Published application
Vehicle-mounted ignitor
AssigneeHitachi, Ltd.
InventorsYasuhiko Kohno, Junpei Uruno, Mutsuhiro Mori
Life of this patent
Estimating the term…
Abstract
A circuit for supplying an oscillation suppress current is provided between a collector terminal and gate electrode of a main IGBT. The current supply circuit comprises a resistor and a diode which are connected in series. A bypass MOSFET is connected between the series connection and the emitter terminal. No semiconductor element having different temperature characteristics is provided in the current supply circuit.
Claims13
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said current supply circuit has at least a resistor and potentially connects said main terminal having the higher potential to said control terminal without interposing any semiconductor switching element therebetween.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said current supply circuit connects said main terminal having the higher potential to said control terminal via a series connection of a resistor and a diode.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said ignitor is provided with a bypass circuit which connects said current supply circuit to one of said pair of main terminals, having a lower potential when a signal for driving said semiconductor element is not input to said control terminal.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said current supply circuit comprises a series circuit of at least a resistor and a diode, which is connected in a direction toward said control electrode from said main terminal having a higher potential;
- and a constant voltage element for restricting the potential on the series connection between said resistor and said diode to a predetermined value.
4 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device, having a higher potential,
- wherein said current supply circuit supplies a current to said control terminal from said main terminal having a higher potential for controlling the current to a predetermined value.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device, having a higher potential,
- wherein said current supply circuit supplies a current to said control terminal from said main terminal having a higher potential when said voltage of said main terminal having a higher potential is lower than a predetermined value and restricts the supply of the current to said control terminal when the voltage of said main terminal is higher than the predetermined value.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device, having a higher potential,
- wherein said current supply circuit comprises a series circuit of two resistors which are connected in a direction toward said control electrode from said main terminal having a higher potential;
- and a constant voltage element for restricting the potential on the series connection to a predetermined value.
4 more elements
An insulated gate semiconductor device comprising:
- a semiconductor substrate having a pair of main surfaces;
- a first layer adjacent to one of said main surfaces in said semiconductor device;
- a second layer selectively formed in said first layer;
- and
- electrodes formed on said main surfaces in such a manner an insulated film is interposed therebetween,
- wherein said insulated film partly has a thick structure.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said semiconductor element, said current restricting circuit and said current supply circuit are incorporated within the range of the diameter of the ignition coil unit as a chip.
3 more elements
A vehicle-mounted ignitor comprising:
- a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source;
- an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied;
- a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device;
- and
- a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential,
- wherein said current supply circuit is configured to connect said one of said main terminals having a higher potential to said control electrode via not switching element, but a resistor, said system further including an ignition coil unit comprising said semiconductor element, said current restricting circuit and said current supply circuit which are incorporated as a chip;
- a connecting terminal of said ignition plug which is provided at one end of the ignition coil unit;
- and an ignition plug which is connected to said connecting terminal, said ignition coil unit and ignition plug being integrated with each other and being embedded in the engine wall so that said ignition plug is exposed within a combustion chamber.
5 more elements
Dependencies are inferred from the claim text.