I am working on a project that involves a DC-DC power step-down. The details are as follows :
- Input : 48V , 15A
- Output : 18V ( around 700W ; due to losses)
However, I could not get any buck converter directly for such high output current. My question is - Could I use a 48V (4S-5S) ESC (of proper rated current) along with a 3-phase full wave rectifier to get the desired DC output? Could the exact voltage that I need could be set with a PWM signal to the ESC?
I am posting this question because I tried this concept with a 4S ESC and a 160V MDS40 3-phase bridge rectifier, and it did not work. I currently do not have an oscilloscope, hence couldn't determine what exactly was happening. Also, I am operating the ESC at 50Hz.
Could anyone please point out what the problem is?
Update: 16th Oct,2019
I connected the ESC to my pc-oscilloscope and I am getting mostly zero voltage reading but there are funny little pulses (see video here) that are occurring in the waveform.