Systems, devices and methods for electrical and/or electronic interconnection

A wireless charging system, comprising:

• a user device;
• and
• a device, comprising:
• a first connector including a Universal Serial Bus (USB) plug integrally formed with a first housing that houses a controller circuit, a field-effect transistor, and a wave filter, wherein the controller circuit is configured to send signals to the field-effect transistor and to receive filtered signals from the wave filter;
• and
• a second connector communicably coupled to the first connector via a cable, the second connector including a second housing that houses a tank circuit including a first transformer coil,
• the controller circuit configured to vary at least one of a switching frequency and impedance of the tank circuit, the first transformer coil configured to magnetically couple to a second transformer coil of the user device based on the at least one of the switching frequency and the impedance, wherein the first transformer coil is configured to power the user device based on the magnetic coupling.

A method, comprising:

• varying, via a controller circuit, at least one of switching frequency and impedance of a tank circuit, the controller circuit integrally formed with a first connector including a Universal Serial Bus (USB) plug and being disposed in a first housing that houses a field-effect transistor, and a wave filter, wherein the controller circuit is configured to send signals to the field-effect transistor and to receive filtered signals from the wave filter, the first connector being communicably coupled to a second connector via a cable, the second connector including the tank circuit including a first transformer coil;
• magnetically coupling the first transformer coil and a second transformer coil of a user device based on the at least one of the switching frequency and the impedance;
• and
• powering, the user device, based on the magnetic coupling between the first transformer coil and the second transformer coil.