Answer / nithi

SCR cannot be used due to the following reason.

1.we have to design commutation circuit for SCR.(this will
increase the complexity of the circuit)

2.cost of SCR is higher than MOSFET,TRANSISTOR & IGBT.

3.SCR is current controlled device .This will increase the
load on the triggering circuit.

4.The voltage drop & power loss in SCR is somewhat higher
than mosfet,igbt & transistor.

5.moreover,the switching frequency of the SCR is very low
(around 1khz).

so,I think it is better to use MOSFET,IGBT & TRANSISTOR as
a switching device in SMPS.OK............

Answer / prasad,clp(power)

Hi dear this is prasad from clp (power)...we can use
thyristor(scr) but for scr we have to design firing angle
circuit separatly,we have to check whether scr is
triggering or turning on exatctly as per our requirements
or not and for high power applications it is better to
diodes,mosfet,igbts..in these we wont face firing angle
circuit design problems...bocz for the SCR firing circuit
is the heart hope so....

Answer / g venkateswarlu

hi dear swathi,as per your question SCR act as switch but it is current controlled device and its operating frequecy is 400-500hz, voltage drop less than 2 volts,and its application are dc motor control and rectifier and inverter. where as MOSFET AND IGBT voltage control device and above nithi ans also correct

Answer / anjun

hi swathi....its better to ask in GATE FORUM, where u will find correct ans......Anjun

Answer / w

Yes u can use the SCR

is earthing is necessary if we use armoured cable

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