Soft-Switching Technology for Three-phase Power Electronics Converters - Rui Li

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will provide an introduction to fundamentals of soft‐switching technology for three‐phase conversion. Impacts of the soft‐switching technique on three‐phase converter performance such as conversion efficiency, power density, and EMI noise is explained. Applications of three‐phase power converters in renewable energy, industry drives, power supplies, etc. are introduced. Development of soft‐switching technology for three‐phase converters is reviewed. A general soft‐switching PWM method for three‐phase converters, edge‐aligned PWM (EA‐PWM), is introduced.

Schematic illustration of ZVS totem power-factor-correction circuit.

      Part 2(Chapters 4 and 5) will investigate applying soft‐switching technology to three‐phase rectifiers. Two types of soft‐switching circuits are investigated. It includes circuit analysis, soft‐switching condition derivation, and circuit parameters design. Then experimental result of the soft‐switching rectifier prototypes are provided.

      Part 3(Chapters 6–9) will aim at applying soft‐switching technology to three‐phase grid inverters. Two types of soft‐switching circuits are investigated. It includes circuit analysis, soft‐switching condition derivation, and circuit parameters design. Then experimental result of the soft‐switching grid inverter prototypes are provided. Since the resonant inductor is a critical component with respect to its loss, size, and thermal design, design of the resonant inductor is introduced. In addition, optimization method for the grid inverter based on the loss model is provided.

      Part 4(Chapters 10–12) will introduce the impact of SiC devices on soft‐switching converters. Improvement of efficiency and power density by introducing SiC to soft‐switching three‐phase converter will be investigated. Converter circuit layout design and its effect are explained. Designs of single‐phase grid inverter, a three‐phase grid inverter, and a BTB converter with soft‐switching technique are provided.

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