I have started learning about DC-DC converters and switch mode power supplies (SMPS.) I know that the standard SMPS (attached fig. below) has an input rectifier, DC link capacitor, inverter, output transformer, output rectifier, output filter and load.
Is it possible to replace the second half of the circuit with just a buck converter (or any other type of DC-DC converter) after the DC-link capacitor as shown below instead of going through an inverter, transformer and another rectifier? A buck converter is also a switched converter and would reduce the size of the filter elements because of the high frequency switching.
Is there a particular reason why one is preferred over the other?