Qiao Li

This book is a technical publication for students, scholars and engineers in electrical engineering, focusing on the pulse-width-modulation (PWM) technologies in power electronics area. Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic interference (EMI) noise, and the lack of utilization of control freedoms in conventional PWM technologies. Then, the model of PWM's impact on system performance is introduced, with the current ripple prediction method for voltage source converter as example. With the prediction model, two major advanced PWM methods are introduced: variable switching frequency PWM and phase-shift PWM, which can reduce the power losses and EMI for the system based on the prediction model. Furthermore, the advanced PWM can be applied in advanced topologies including multilevel converters and paralleled converters. With more control variables in the advanced topologies, performance of PWM can be further improved. Also, for the special problem for common-mode noise, this book introduces modified PWM method for reduction. Especially, the paralleled inverters with advanced PWM can achieve good performance for the common-mode noise reduction. Finally, the implementation of PWM technologies in hardware is introduced in the last part.

This book is a technical publication for students, scholars and engineers in electrical engineering, focusing on the pulse-width-modulation (PWM) technologies in power electronics area. Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic interference (EMI) noise, and the lack of utilization of control freedoms in conventional PWM technologies. Then, the model of PWM's impact on system performance is introduced, with the current ripple prediction method for voltage source converter as example. With the prediction model, two major advanced PWM methods are introduced: variable switching frequency PWM and phase-shift PWM, which can reduce the power losses and EMI for the system based on the prediction model. Furthermore, the advanced PWM can be applied in advanced topologies including multilevel converters and paralleled converters. With more control variables in the advanced topologies, performance of PWM can be further improved. Also, for the special problem for common-mode noise, this book introduces modified PWM method for reduction. Especially, the paralleled inverters with advanced PWM can achieve good performance for the common-mode noise reduction. Finally, the implementation of PWM technologies in hardware is introduced in the last part.

An epic spanning more than half a century of Taiwan's history, this breathtaking historical novel traces the fortunes of the Pengs, a family of Hakka Chinese settlers, across three generations from the 1890s, just before Taiwan was ceded to Japan as a result of the Sino-Japanese war, through World War II. Li Qiao brilliantly re-creates the dramatic world of these pioneers-and the colonization of Taiwan itself-exploring their relationships with the aboriginal peoples of Taiwan and their struggle to establish their own ethnic and political identities. This carefully researched work of fiction draws upon Li's own experiences and family history, as well as oral and written histories of the era. Originally published in Chinese as a trilogy, this newly translated edition is an abridgement for English-speaking readers and marks the work's first appearance in the English-speaking world. It was well-received in Taiwan as an honest-and influential-recreation of Taiwan's history before the relocation of the Republic of China from the mainland to Taiwan. Because Li's saga is so deeply imbued with the unique culture and complex history of Taiwan, an introduction explaining the cultural and historical background of the novel is included to help orient the reader to this amazingly rich cultural context. This informative introduction and the sweeping saga of the novel itself together provide an important view of Taiwan's little known colonial experience.

An epic spanning more than half a century of Taiwan's history, this breathtaking historical novel traces the fortunes of the Pengs, a family of Hakka Chinese settlers, across three generations from the 1890s, just before Taiwan was ceded to Japan as a result of the Sino-Japanese war, through World War II. Li Qiao brilliantly re-creates the dramatic world of these pioneers-and the colonization of Taiwan itself-exploring their relationships with the aboriginal peoples of Taiwan and their struggle to establish their own ethnic and political identities. This carefully researched work of fiction draws upon Li's own experiences and family history, as well as oral and written histories of the era. Originally published in Chinese as a trilogy, this newly translated edition is an abridgement for English-speaking readers and marks the work's first appearance in the English-speaking world. It was well-received in Taiwan as an honest-and influential-recreation of Taiwan's history before the relocation of the Republic of China from the mainland to Taiwan. Because Li's saga is so deeply imbued with the unique culture and complex history of Taiwan, an introduction explaining the cultural and historical background of the novel is included to help orient the reader to this amazingly rich cultural context. This informative introduction and the sweeping saga of the novel itself together provide an important view of Taiwan's little known colonial experience.