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Dear Sir or Madam, Could I ask how to design the resistance and capacitance values for the gate drive circuit of the SCRs? Thank you so much. Looking forward to hearing from you. Sincerely, Yuwei Bai

There are no easy methods for selecting the values of RS and CS , Figure 6.41 in Thyristor Theory and Design Considerations required to limit commutating dv/dt.

The circuit is a damped tuned circuit comprised by RS, CS,RL and LL, and to a minor extent the junction capacitance of the TRIAC.
Answered by:
ON Semiconductor
2015-04-08 09:30:51.611