Improvement of Capacitively Isolated Outlet and Plug for Practical Use

Isolated outlet and plug is suitable for DC power distribution to avoid arcing at detach. Authors have proposed isolated outlet and plug using comb type capacitor in order to realize large coupling capacitance for larger transfer power. Over 40W power transfer was realized using prototype capacitive couplings and half-bridge inverter with LC series resonance. The size of prototype capacitive coupling is same to conventional double outlet socket in Japan (120mm × 75mm × 45mm). Although the size is not so large, it is difficult to insert and remove due to large number of teeth. In this paper, smaller and simpler comb type capacitor is proposed using higher frequency in order to realize practical isolated outlet and plug.