We designed a single phase AC(50Hz) to DC converter with a full wave half controlled SCR-Diode bridge rectifier and LC filter on DC side. The LC filter is mainly to limit output ripple. In addition to attenuate ripple which we calculate at full load; we intend to maintain good voltage regulation from no load to full load.
So we wanted to explore swinging choke option where inductance changes with load current (low current-high inductance; high current-low inductance) so that our system acts as a choke fed filter at no/light load condition & capacitor fed filter at full load thereby maintaining output nearly constant from no load to full load.
But we got to know from the manufacturer that a swinging choke only has a range of inductance change for a given change of current. Our current range from no load to full load is too much of a change and the real inductance will never coincide. Instead, we can add a resistor in series with the choke but will make up the loss.
Please suggest any other method to have good ripple attenuation along with good voltage regulation with a LC filter?
I have seen people also doing as below.