https://upload.qariya.info/images/qariya-0491977706.png works for me on Google translator
Well Brother .... it works like this.
SCR on the right determines if rectified voltage is high enough and if not, SCR on the LEFT fires till next zero crossing to charge up 0.1F Cap with R3= 47 Ohms
Not very well regulated or efficient but better than brute force bridge with dynamic load regulation errors of 40%
I like my design better along the same lines, since it uses low ESR 1mF rather than high ESR 100mF.
THis was 60Hz 170Vp
For 50Hz it would be 230 * √2 =Vp line input
Change 100K depending on bridge Voltage to get 3Vp to drive current to SCR trigger voltage of 1.3V from 2K
Choice of SCR with sensitive gate for input current is assumed capable of 10x average output current rating for pulse charging.
This could be used for physically isolated LEDs 100W, 1A arrays or as pre-regulator