I am not professional. I am just a student and setting up my personal lab. Thats why I am looking for ready solutions so that I can finish setting up my lab quickly.
Here is the bare-bones concept of an H-bridge. The control circuitry is not shown.
The 120 VDC supply is turned into square waves, then fed to the transformer primary. The secondary is 6 VAC square waves. You rectify and filter it to get smooth 5 VDC.
20 kHz is a typical operating frequency. My simulated transformer has specs which are compatible (more or less).
As you know the transformer can be much smaller than an everyday 50/60 Hz power transformer.
I am not professional. I am just a student and setting up my personal lab. Thats why I am looking for ready solutions so that I can finish setting up my lab quickly.
Under this conditions, and because designing and building a off-line non-insuilated power supply is NOT a trivial matter, I would do the following:
-Take a 240/120 volt to 24 volt @ 4 amp transformer. Rectify and filter the output. That takes care of the isolation.
-You now will have raw DC in the range of 32 to 40 volts. Now search manufacturer websites for reference designs to step the voltage down to a regulated 5 volts. Most likely you'll find buck designs. There will be plenty of them.