C. Wireless Charging System
The principle of wireless charging of the robot system is
shown in Fig. 11. The 220V (AC) voltage is converted to 12V
(DC) voltage. The transmitting circuit converts the 12V (DC)
to AC voltage for the wireless transmission of electrical
energy. The primary side coil transmits energy to the
secondary side coil wirelessly based on the principle of
electromagnet induction. The receiving circuit converts the
AC voltage of the secondary side coil into a DC voltage for
the battery charging.