PATENT CLAIM ANALYSIS

Application Number: 16066450
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2019-02
Patent Classification: ["257", "368000"]

Abstract:
A diode includes a first-conductivity-type barrier region disposed between a drift region and a second impurity region and having an impurity concentration higher than that of the drift region and a second-conductivity-type field extension prevention region disposed between the barrier region and the drift region. The diode also includes a trench gate disposed to extend from a second main surface of a semiconductor substrate through the second impurity region and the barrier region and reach the field extension prevention region. The trench gate has a gate electrode for applying a gate voltage. A gate electrode is applied with a parasitic gate voltage, as the gate voltage. The parasitic gate voltage has an absolute value of a potential difference with a second electrode being equal to or greater than a threshold voltage of a parasitic transistor formed of the second impurity region, the barrier region, and the field extension prevention region.

Claim (Index 3):
A semiconductor device, comprising:\n a reverse conducting switching element in which a diode and a switching element are disposed in parallel in a same semiconductor substrate; a drive unit which applies a gate voltage to the reverse conducting switching element; and a mode determination unit which determines whether the reverse conducting switching element is driven in a forward conduction mode in which a current flows mainly in the switching element or in a reverse conduction mode in which a current flows mainly in the diode, wherein the diode includes: a first electrode disposed on a first main surface of the semiconductor substrate; a first-conductivity-type first impurity region disposed in a surface layer of the semiconductor substrate adjacent to the first main surface and stacked on the first electrode; a first-conductivity-type first drift region stacked on the first impurity region and having an impurity concentration lower than the impurity concentration of the first impurity region; a second-conductivity-type second impurity region stacked on the first drift region; a second electrode disposed on the second impurity region and on a second main surface of the semiconductor substrate which is opposite to the first main surface; a first-conductivity-type first barrier region disposed between the first drift region and the second impurity region and having an impurity concentration higher than the impurity concentration of the first drift region; and a second-conductivity-type first field extension prevention region disposed between the first barrier region and the first drift region, wherein the switching element includes: a first-conductivity-type second drift region; a second-conductivity-type body region disposed in the surface layer of the semiconductor substrate adjacent to the second main surface; and a first-conductivity-type third impurity region disposed in the surface layer of the semiconductor substrate adjacent to the second main surface to be surrounded by the body region, wherein the diode and the switching element include: a trench gate disposed to extend from the second main surface through the second impurity region and the first barrier region and to reach the first drift region, the trench gate having a gate electrode for applying the gate voltage, and wherein, in the reverse conduction mode, the drive unit is configured to apply a parasitic gate voltage as the gate voltage, the parasitic gate voltage having an absolute value of a potential difference with the second electrode that is equal to or greater than a threshold voltage of a parasitic transistor formed of the second impurity region, the first barrier region, and the first field extension prevention region.

Metadata:
- Claim Count in Document: 37.0
- Percentile: 94.0
- Lexical Diversity: 2.59016
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15770258', '14513685', '12867591', '12677131', '13129980']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9210113258029076
- 35 USC 102 Novelty (BERT): 0.4861211032320403
- Combined Prediction Score: 0.8775223035458207
- Mean Citation Score: 245.95843400000004
- Max Citation Score: 270.492
- Similarity Product: 257.2034958307744

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test