Us outstanding popu¬ larity was a result of its unique design point-of-view. Wc published our first handbook in 10(14.
A number of our most experienced applications and ratings engineers and our customers have all had a hand in the production of this handbook. Added illustrations, examples and design aids - especially the directly useable polyphase waveforms for current analysis in Chapter 12 - make this handbook more useable. New Sections on noise, transients and harmonics and a tabulation of DC switching circuits and nominal design data plus enhanced sections on power conversion (including inverters), choppers, and polyphase circuits for the conversion of AC power make the coverage more complete. The goal has been to make this book not only more comprehensive but more useable as well. This handbook has been designed by its editor to give the equip¬ ment designer and the user this kind of information. The development of devices with improved frequency and power handling capabilities in recent years has created an urgent need for a publication with the most up-to-date information on device design and application. FOREWORD Since its introduction more than ten years ago, the silicon con¬ trolled rectifier has become a key building block in control systems of almost every conceivable application. In the absence of an expressly written agreement to the contrary, Westinghouse Electric Corporation assumes no liability for patent infringement arising out of any use of the semi¬ conductor devices with other devices or elements by any purchaser of semiconductor devices or others. The semiconductor devices, circuits and arrangements disclosed herein may be covered by patents of Westinghouse Electric Corpo¬ ration or others, Neither the disclosure of any information herein nor the sale of semiconductor devices by Westinghouse Electric Corporation conveys any license under patent claims covering circuits or combinations of the semiconductor devices with other devices or elements. Although reasonable care has been taken in their technical correctness, no responsibility is assumed by the Westinghouse Electric Corporation for any conse¬ quences of their use. The circuit diagrams included in this handbook are included for illustration of typical SCR thyristor applications and arc not intended as constructual information. Steinbruegge Second Edition September, 1070 Westinghouse Electric Corporation Semiconductor Division Youngwood, Pennsylvania U-70.HA Primed 1» U.S.A. Westinghouse SILICON CONTROLLED RECTIFIER DESIGNERS HANDBOOK Leslie R.
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