1977 | OriginalPaper | Chapter
Multiple Connections of SCRs
Author : M. Ramamoorty
Published in: An Introduction to Thyristors and Their Applications
Publisher: Macmillan Education UK
Included in: Professional Book Archive
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Silicon-controlled rectifiers are now available with a voltage rating upto 10 kV and a current rating upto 1200 A. In many power control applications, the required voltage and current ratings are lower than these maximum limits. Therefore, even though it may be possible to obtain a single SCR of proper voltage and current ratings, on many occasions the designer is forced to use lower-rated SCRs for reasons of economy and availability. In such a situation, lower-rated SCRs hive to be connected in series and parallel combinations to suit the voltage and current requirements of the circuit for a particular application. Series and parallel coinbinations are also often used when it is required to control power in low-voltage high-current circuits or high-voltage low-current circuits because an SCR of suitable voltage and current ratings may not be available.