Customized High Power Qi-Compliant Wireless Charging Transmitter Coil with Litz Wire Product Overview Customized Laps Qi-compliant High-power Wireless Charging Transmitter Coil - one of the core components of wireless charging technology. Wireless charging technology is based on the principle of electromagnetic induction, similar to the working principle of a transformer. There is a coil at the transmitting end (charging cradle or charging pad) and at the receiving end