It is a little difficult to obtain the lower dc voltage below the one obtained from input ac supply voltage without transformer or switching operations. Those operations can be implemented by passive devices due to fabrication of electrolytic capacitors. The results are confirmed by the theoretical and experimental implementations.
Published in:
Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE
Date of Conference: 5-8 Nov. 2007