Mobile device and charging apparatus

A method for charging a selected mobile device, comprising:

• detecting respective positions on a receptacle of a plurality of mobile devices that issue charge order instructions, each of said plurality of mobile devices includes a rechargeable battery, a receiver coil that receives AC power, a rectifier that rectifies the AC power into DC power, a plurality of capacitors disposed between the receiver coil and the rectifier, and a switch that selectably connects or disconnects the receiver coil one or more of the capacitors;
• comparing charge order instructions from the plurality of mobile devices and determining a selected mobile device with a lowest charge, said selected mobile device being one of the plurality of mobile devices;
• moving a transmitter coil to the selected mobile device;
• and
• charging the selected mobile device to a predetermined charge threshold.

A mobile device comprising:

• a rechargeable battery;
• a receiver coil that outputs AC power received from a charging apparatus that wirelessly charges the rechargeable battery;
• a rectifier that rectifies the AC power output by the receiver coil into DC power;
• a capacitor that is switchably connected between the receiver coil and the rectifier;
• a charger that charges the rechargeable battery with the DC power rectified by the rectifier, and measures the charge level of the rechargeable battery;
• a switch that selectably connects or disconnects the receiver coil and the capacitor;
• and
• a charging controller that controllably operates the switch to change a capacitance level of the mobile device by disconnecting the capacitor from the receiver coil when the charge level of the rechargeable battery is equal to or greater than a predetermined threshold value, and connects the capacitor to the receiver coil with the switch when the charge level of the rechargeable battery is less than the threshold value.