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Series, inverse-parallel, turn-off connections for SCR thyristor

Posted: 12 Dec 2000     Print Version  Bookmark and Share

Keywords:TRIAC  thyristor  SCR 

In the big variety of the AC applications in which the thyristor technology is used, there are some cases in which high power loads must be controlled by solid state devices, but because of the high power, these big loads cannot be handled by only one TRIAC device, therefore, it is common to connect two SCR in inverse–parallel since this arrangement would allow to drive bigger levels of power since the control stand point.

In the case of the DC applications, there are also some cases in which the loads must be supplied with high levels of voltage (over than 1000 Volts), so for these kind of applications, it is needed to have a solid state device capable to sustain these high voltage levels, therefore in these cases, the most feasible solution is to connect two SCR (800 V) in series in order to generate a high voltage device (1600 V).

In addition to the previous cases, there are also some applications in which it is needed to make the turn–off of an SCR device when it is operating under D.C. current conditions, and this can be done through the forced commutation methods for SCRs.

This application note by ON Semiconductor explains some alternatives for making the control functions for SCR thyristor devices including: inverse parallel connection of two SCRs; series connection of two SCRs; and forced commutation methods for turning-off the SCRs.

View the PDF document for more information.





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