PWM Variable Frequency Speed Regulation and Soft Switching Power Conversion Technology

Author: Chen Guocheng
Publisher:
Publish Date: 2002-01-01
Features: The first half of this book elaborates on the fundamental principles of frequency conversion speed regulation, voltage/frequency control methods, and the energy-saving principles of frequency converters. It introduces PWM mode and its optimization, analyzes and derives the spectral characteristics and mathematical expressions of different PWM modes, and describes the generation methods of PWM pulses, the application and protection methods of IGBT power modules, and the control functions of frequency converters. It provides a detailed analysis of the characteristics of input and output current waveforms of frequency converters, the commutation process in the main circuit, and the energy conversion issues of motors. The second half of the book focuses on EMI in power conversion, introducing various topological circuit structures that employ soft-switching techniques to suppress EMI. Using single-phase and three-phase converters as typical examples, it analyzes in detail the working mechanisms of soft switching, derives the transient characteristics of the circuits mathematically, and presents new research findings.