PATENT CLAIM ANALYSIS

Application Number: 15865212
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-07
Patent Classification: ["363", "021140"]

Abstract:
A flyback power converter circuit converting an input voltage to an output voltage includes a transformer, a power switch, a synchronous rectifier (SR) switch, and a secondary side control circuit. The secondary side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit powered by a voltage related to the output voltage, which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and/or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.

Claim (Index 1):
A flyback power converter circuit, comprising:\n a transformer, which includes a primary side winding for receiving an input voltage and a secondary side winding for generating an output voltage; a power switch which is coupled to the primary side winding, and configured to operably control a conduction time of the primary side winding; a synchronous rectifier (SR) switch which is coupled to the secondary side winding, and configured to control a conduction time of the secondary side winding which is conductive when the primary side winding is not conductive; and a secondary side control circuit which is located at a secondary side of the transformer and is coupled to the SR switch, and which is configured to operably control the SR switch, the secondary side control circuit including: a first driving switch, wherein a current inflow terminal of the first driving switch is coupled to a control terminal of the SR switch, and a current outflow terminal of the first driving switch is coupled to a reference voltage; a synchronous control circuit which is coupled to a control terminal of the first driving switch and is powered by a voltage which is related to the output voltage (an output voltage related voltage), the synchronous control circuit being configured to operably control the first driving switch to operate the SR switch; and a clamping circuit, including:\n a clamping switch, coupled to the control terminal of the SR switch; and \n a clamping switch control circuit which is coupled to a control terminal of the clamping switch, and configured to operably control the control terminal of the clamping switch according to a voltage on a current inflow terminal of the clamping switch and/or the output voltage related voltage, such that in a secondary side power-on time period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance; \n wherein the secondary side power-on time period is a time period before the output voltage related voltage achieves a predetermined power-on voltage threshold.

Metadata:
- Claim Count in Document: 2.0
- Percentile: 86.0
- Lexical Diversity: 2.81667
- Patent Class: 363.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['13966248', '15147182', '12604246', '15809595', '10346807']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8268470443528432
- 35 USC 102 Novelty (BERT): 0.4789209892519407
- Combined Prediction Score: 0.792054438842753
- Mean Citation Score: 256.97822599999995
- Max Citation Score: 264.48245
- Similarity Product: 252.98312119881504

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

Dataset: test