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 16):
The device according to  claim 12 , wherein the computing unit is configured to calculate the target neutral-point current based on the difference between the voltage of the upper bus capacitor and the voltage of the lower bus capacitor by acts of:\n calculating the difference between the voltage of the upper bus capacitor and the voltage of the lower bus capacitor by a formula of\n \u0394 u N =u d3 \u2212u d1 , \n where, \u0394u N  represents the difference, u d1  represents the voltage of the upper bus capacitor and u d3  represents the voltage of the lower bus capacitor; and\n calculating the target neutral-point current based on the difference by a formula of \n i Nref = \u0394 \ue89e \ue89e u N \u00b7 C d T s , where, i Nref  represents the target neutral-point current, T s  represents a carrier period, and C d  represents a capacitance value of a single bus capacitor.

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): 0.7968011754580686
- 35 USC 102 Novelty (BERT): 0.5023077763712297
- Combined Prediction Score: 0.7673518355493847
- Mean Citation Score: 228.819082
- Max Citation Score: 246.3851
- Similarity Product: 179.9820790946722

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