Method and apparatus for detecting load fluctuation of wireless power transmission

PURPOSE: A method and apparatus capable of detecting load change of wireless power transmission are provided to perform an action protecting overvoltage and overcurrent by communicating with the wireless power transmission apparatus. CONSTITUTION: A control and communications unit transmits PA power(1310). The control and communication unit can control supply power transmitted to PA, by controlling the power supplier. The control and communication unit senses change of the PA current by detecting PA current(1320). The control and communication unit can sense change of the PA by detecting a power detector. The control and communication unit detects target load based on the change of PA current(1330). The control and communication unit determines the status of wireless power transmission based on detected target load. The control and communication unit can control PA power based on detected target load. [Reference numerals] (1310) Wireless power transmission; (1320) Current change detection; (1330) Load detection; (1340) Wireless power transmission condition determination; (AA) Start; (BB) End