Device and method for wireless power transmission in electronic device

An electronic device comprising:

• a reception coil configured to output a first alternating current (AC) inducted from a first magnetic field;
• a constant voltage supply unit comprising circuitry configured to supply a constant voltage by the first AC output by the reception coil;
• and
• a transmission coil configured to generate a second magnetic field for wireless power transmission by a second AC including a constant current corresponding to the constant voltage supplied from the constant voltage supply unit,
• wherein the constant voltage supply unit includes a first capacitor, an inductor, and a second charging scheme configured to connect an output terminal of the reception coil and an input terminal of the transmission coil in series and to have a third capacitor to connect a ground and a point between the inductor and the second capacitor.