Be careful! 70 000 Volts on your smartphone ;).
Switch mode resonant transformer power supply. LEDs show transistors control signals. Transistors ON time is tuned for half of the LC resonant circuit period. Full H-bridge support alternative positive and negative capacitance charging with 50 kHz frequency. High voltage rectifier gives DC output. Input is 563VDC, typical for 3-phase rectifier output voltage for european 400VAC grid.
