I recently watched this video about the design of a high voltage (300 V) commercial power supply. I reckon that the block diagram is essentially a bridge rectifier followed by a DC/DC convertor like the following image shows.
Given the high voltage involved, it is implemented with a Phase-Shifted Resonant Convertor that uses soft-switching to reduce switching loss.
I was wondering, how are high current commercial power supplies designed, let’s say DC current above 100 A such as these and these one.
In theory, a bridge rectifier followed by a buck convertor would do the job, but I imagine it would be terribly inefficient (the same reason that the high-voltage supply isn’t implemented using a boost convertor).
Does someone know topologies are used in commercially available high current power supplies?
Many thanks in advance
Best Answer
You can use a multiphase buck converter such as this one: -
Note that this is a 6 phase device and the full circuit is shown in the data sheet on page 46.
To get down to the required input voltage range for the LTC7871 use an isolating forward converter to produce circa 50 or 60 volts (45 amps) from the power factor corrected rectified input AC voltage.