231. What are the main advantages of using switcher type power supply?

Line voltage is directly rectified and filtered to produce a high dc voltage, components are much smaller and lighter weight, can provide much better efficiency.
The transformed voltage is directly rectified and filtered to produce a high dc voltage, components are much smaller and lighter weight and can provide much better efficiency.
They use laminated steel transformers which are more efficient.
Using a center tapped transformer secondary allows fewer rectifiers to be used.

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