Insulated gate thyristor
First Claim
1. An insulated gate thyristor comprising:
- a highly resistive base layer of a first conductivity type;
a first base region of a second conductivity type, said first base region being selectively formed in the surface portion on a first side of said base layer;
a second base region of said second conductivity type, said second base region being selectively formed in the surface portion on said first side of said base layer;
said first and second base regions being spaced from each other;
a source region of said first conductivity type, said source region being selectively formed in the surface portion of said first base region;
an emitter region of said first conductivity type, said emitter region being selectively formed in the surface portion of said second base region;
a first insulation film on an extended portion of said base layer extended between said first and second base regions, an extended portion of said first base region extended between said source region and said extended portion of said base layer and an extended portion of said second base region extended between said emitter region and said extended portion of said base layer;
a gate electrode on said first insulation film;
a first main electrode commonly contacting with said extended portion of said first base region and said source region;
an emitter layer of said second conductivity type, said emitter layer being on a second side of said base layer;
a second main electrode contacting with said emitter layer;
a second insulation film covering the entire surface of said second base region; and
a resistor on said emitter region, said resistor being connected to said first main electrode.
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Accused Products
Abstract
An insulated gate thyristor is provided in which an inversion layer is created beneath a gate electrode to which a voltage is applied. An emitter region of a first conductivity type is biased to the same potential as a first main electrode via a MOSFET channel, and a thyristor portion consisting of the emitter region, a second base region of a second conductivity type, a base layer of the first conductivity type and an emitter layer of the second conductivity type is turned on. As electrons are injected uniformly from the entire emitter region, the insulated gate thyristor quickly shifts to the thyristor mode, and the on-voltage of the insulated gate thyristor of the invention is lowered. The insulated gate thyristor of the invention does not require a hole current that flows through the second base region of a convention EST in the Z-direction. In turning off, the pn junction recovers quickly without causing current localization, and the breakdown withstand capability if improved.
47 Citations
40 Claims
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1. An insulated gate thyristor comprising:
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a highly resistive base layer of a first conductivity type; a first base region of a second conductivity type, said first base region being selectively formed in the surface portion on a first side of said base layer; a second base region of said second conductivity type, said second base region being selectively formed in the surface portion on said first side of said base layer; said first and second base regions being spaced from each other; a source region of said first conductivity type, said source region being selectively formed in the surface portion of said first base region; an emitter region of said first conductivity type, said emitter region being selectively formed in the surface portion of said second base region; a first insulation film on an extended portion of said base layer extended between said first and second base regions, an extended portion of said first base region extended between said source region and said extended portion of said base layer and an extended portion of said second base region extended between said emitter region and said extended portion of said base layer; a gate electrode on said first insulation film; a first main electrode commonly contacting with said extended portion of said first base region and said source region; an emitter layer of said second conductivity type, said emitter layer being on a second side of said base layer; a second main electrode contacting with said emitter layer; a second insulation film covering the entire surface of said second base region; and a resistor on said emitter region, said resistor being connected to said first main electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An insulated gate thyristor comprising:
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a highly resistive base layer of a first conductivity type; a first base region of a second conductivity type, said first base region being selectively formed in the surface portion on a first side of said base layer; a second base region of said second conductivity type, said second base region being selectively formed in the surface portion on said first side of said base layer; said first and second base regions being spaced from each other; a source region of said first conductivity type, said source region being selectively formed in the surface portion of said first base region; an emitter region of said first conductivity type, said emitter region being in the surface portion of said second base region; a trench between said first and second base regions, said trench being dug more deeply than said first and second base regions; a first insulation film covering the inner surface of said trench; a gate electrode in said trench with said first insulation film interposed between said gate electrode and said trench; a first main electrode commonly contacting with an extended portion of said first base region and said source region, said extended portion being extended beside said source region; an emitter layer of said second conductivity type, said emitter layer being on a second side of said base layer; a second main electrode contacting with said emitter layer; and a second insulation film covering the entire surface of said second base region; a resistor on said emitter region, said resistor being connected to said first main electrode. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification