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Why the Gate triggered method is always preferred to turn on the thyristor?
Wiki User
∙ 13y ago
A: Because that is the controlling lead of an thyristor. .To do it otherwise it will be on-off at hi voltage only
Wiki User
∙ 13y ago
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AC chopper is also called AC voltage controller. In AC voltage controller, we use 2 thyristors as switching element. In AC chopper we use MOSFET or IGBT as switching element with diodes in bridge rectifier for bidirectional flow of current. This use of mosfet switch has the following advantages over thyristor: * no separate firing circuit are needed for Mosfet ( it can be driven directly by interfacing it with MC) whereas firing circuits are needed for SCR. *when the line current drops to zero SCR turns off due to natural commutation( when it reaches 172 deg) ; mosfet- user control - we can turn on and off as per our requirement. * snubber circuit is needed for thyristor phase control method. By using mosfet in diode rectifier provides internal snubber
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