Wireless power transfer via inductive coupling

The initial setup: • Vcc = 12V • 2 pcs STP60NF10 power MOSFET transistors • 2 pcs Rg = 68 ohms/3W(R1, R2) , but later increased to 100 ohms /2W • 2 pcs Radio frequency chokes ~ 150uH. • 2 pcs Diode D1, D2 = STTH3R02 -ultrafast 200V/3A • 2 pcs Diode D3, D4 = SR810 schottky 100V/8A • L = 1 turn/ 210 mm diameter/13 mm Copper tube • 5 pcs capacitors C1-C5 = 22nF/ FKP type 1000V Various MOSFET transistor tests. The current on power supply no load = Io with load = Is 1. IRF520NPBF Io = , Is = 0.7