PATENT CLAIM ANALYSIS

Application Number: 15980794
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2019-02
Patent Classification: ["363", "132000"]

Abstract:
A method and a device for voltage balancing of DC bus capacitors of an NPC four-level inverter are disclosed. The method includes: determining an optimal zero-sequence voltage, determining an actual reference voltage of each phase based on the optimal zero-sequence voltage; comparing respectively three preset carrier signals with the actual reference voltage of each phase to obtain three first control signals; determining three duty-cycle adjustment values based on a voltage of the intermediate bus capacitor; adjusting correspondingly the three first control signals based the three duty-cycle adjustment values to obtain three second control signals; inputting correspondingly the three second control signals to three first switches of an upper bridge corresponding to each phase; and inputting correspondingly complementary signals of the three second control signals to three second switches of a lower bridge corresponding to each phase.

Claim (Index 18):
The device according to  claim 12 , wherein the three preset carrier signals C r1 , C r2  and C r3  corresponds to the three first switches S x1 , S x2  and S x3 , x represents a phase, b phase or c phase; the preset carrier signals C r1 , C r2  and C r3  are triangle-wave signals that have the same period and the same phase,\n a first carrier signal C r1  and a third carrier signal C r3  have an amplitude of 3/2, a second carrier signal C r2  has an amplitude of 3; the first carrier signal C r1  has a lowest point of 3/2 and a highest point of 3; the second carrier signal C r2  has a lowest point of 0 and a highest point of 3; and the third carrier signal C r3  has a lowest point of 0 and a highest point of 3/2.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 93.0
- Lexical Diversity: 2.41667
- Patent Class: 363.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15109219', '15662044', '13912398', '14153103', '15823192']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7955176539211775
- 35 USC 102 Novelty (BERT): 0.5111410008790163
- Combined Prediction Score: 0.7670799886169614
- Mean Citation Score: 228.819082
- Max Citation Score: 246.3851
- Similarity Product: 158.4632163274884

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