PATENT CLAIM ANALYSIS

Application Number: 16247520
Application Type: Utility
Filing Date: 2019-01
Publication Date: 2020-01
Patent Classification: ["363", "021140"]

Abstract:
A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller and a secondary side controller. The primary side controller generates a switching signal to control a power transformer through a power transistor to generate an output voltage. The secondary side controller generates an SR (synchronous rectifier) signal to control an SR transistor at a secondary side of the power transformer. The SR signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the SR transistor according to a demagnetizing period of the power transformer. The ZVS pulse determines the starting timing of the switching signal to achieve zero voltage switching for the power transistor. The secondary side controller generates the ZVS pulse after a delay time from when the power transformer is demagnetized. The delay time is determined according to an output load of the output voltage.

Claim (Index 1):
A zero voltage switching (ZVS) control circuit, configured to operably control a flyback power converter including a power transformer having a primary side and a secondary side, the ZVS control circuit comprising:\n a primary side controller circuit, configured to operably generate a switching signal according to a feedback signal, wherein the switching signal controls a power transformer through a power transistor at the primary side to generate an output voltage at the secondary side; and a secondary side controller circuit, configured to operably generate the feedback signal, and generate an SR signal to control a synchronous rectifier transistor at the secondary side, wherein the SR signal includes an SR-control pulse and a ZVS pulse, wherein the SR-control pulse controls the synchronous rectifier transistor in response to a demagnetizing period of the power transformer, and wherein the ZVS pulse controls the power transformer through the synchronous rectifier transistor to determine a timing for starting the switching signal to achieve zero voltage switching for the power transistor; wherein the secondary side controller circuit generates the ZVS pulse after a delay time from an end of a demagnetizing period of the power transformer, wherein within the demagnetizing period, the power transformer is substantially demagnetized, and the delay time is determined according to a time length of the demagnetizing period, wherein the delay time is increased as the time length of the demagnetizing period of the power transformer is decreased.

Metadata:
- Claim Count in Document: 11.0
- Percentile: 99.0
- Lexical Diversity: 2.77586
- Patent Class: 363.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['16134906', '16160837', '15147182', '15809595', '15989025']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.831115378384006
- 35 USC 102 Novelty (BERT): 0.5568926650156232
- Combined Prediction Score: 0.8036931070471678
- Mean Citation Score: 328.27005
- Max Citation Score: 429.8369
- Similarity Product: 421.0753293444038

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

Dataset: test