Wireless power transmission system for detecting optimal resonance frequency and method of detecting optimal resonance frequency using the same

A method of detecting an optimal resonance frequency for maximum power transmission, in a method of detecting a resonance frequency of a wireless power transmission system using magnetic resonant coupling of a transmission unit and a reception unit, the method comprising:

• (a) setting a system frequency within a preset frequency variable range and transmitting power from the transmission unit to the reception unit, (b) measuring a current value of the transmission unit, an output voltage value and an output current value of the reception unit according to the system frequency that is set, (c) calculating power transmission efficiency using a current value of the transmission unit measured at the resonance frequency, and an output voltage value and output current value of the reception unit measured at the resonance frequency, when the measured output voltage value is equal to or greater than a preset receiving voltage determination value, (d) repeating steps starting from step (a) by varying the system frequency within the frequency variable range, and (e) determining a maximum value of the calculated power transmission efficiency as an optimal resonance frequency.