PATENT CLAIM ANALYSIS

Application Number: 15965007
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2018-08
Patent Classification: ["327", "109000"]

Abstract:
A switching circuit includes main switching a device and a drive circuit. The main switching device has a gate terminal, a drain terminal, and a first source terminal through which a main current flows, and a second source terminal for gate drive connected to drive circuit. The drive circuit has a bias capacitor having a negative electrode terminal connected to the second source terminal, a first series circuit formed between a positive electrode terminal and the gate terminal by connecting a high-side switch, a resistor, and a capacitor in series, and a second series circuit formed between the gate terminal and the second source terminal by connecting the capacitor, a resistor and a low-side switch in series. The drive circuit adjusts each of gate charge and discharge currents, and further damps the oscillation of the waveform of gate current/voltage.

Claim (Index 1):
A switching circuit, comprising:\n a main switching device; and a drive circuit, wherein the main switching device includes:\n a drain electrode; \n a gate electrode; and \n a source electrode, \n wherein when the main switching device is in an ON state where a voltage higher than or equal to a threshold voltage is applied between the gate electrode and the source electrode, a main current flows between the drain electrode and the source electrode, wherein the main switching device further includes:\n a gate terminal connected to the gate electrode; \n a drain terminal connected to the drain electrode; \n a first source terminal which is connected to the source electrode and through which the main current flows; and \n a second source terminal for gate drive connected to the source electrode and the drive circuit, \n wherein the drive circuit includes:\n a bias voltage source having a negative electrode terminal connected to the second source terminal, and a positive electrode terminal; \n a first series circuit formed between the positive electrode terminal and the gate terminal by connecting a first switch element, a first resistor, and a capacitor in series; and \n a second series circuit formed between the gate terminal and the second source terminal by connecting the capacitor, a second resistor, and a second switch element in series, \n wherein when the first switch element is in an ON state, and a current flows through a turn-on loop formed by the bias voltage source, the first series circuit, and the main switching device, even when a voltage drop occurs in the turn-on loop by a first parasitic inductance present in the turn-on loop, the voltage between the gate electrode and the source electrode is maintained at a voltage higher than or equal to the threshold voltage, and when the second switch element is in an ON state, and a current flows through a turn-off loop formed by the main switching device and the second series circuit, even when a voltage drop occurs in the turn-off loop by a second parasitic inductance present in the turn-off loop, the voltage between the gate electrode and the source electrode is maintained at a voltage lower than the threshold voltage.

Metadata:
- Claim Count in Document: 23.0
- Percentile: 91.0
- Lexical Diversity: 2.81481
- Patent Class: 327.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15777126', '15925104', '11757675', '10813182', '11285694']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7796450425189627
- 35 USC 102 Novelty (BERT): 0.4956674421585106
- Combined Prediction Score: 0.7512472824829175
- Mean Citation Score: 249.754794
- Max Citation Score: 262.84695
- Similarity Product: 194.75312316171525

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

Dataset: test