Wireless power receiver and wireless power transmission system using the same

A wireless power transmission system comprising:

• a wireless power transmitter;
• and
• a wireless power receiver, wherein
• the wireless power transmitter includes:
• an inverter that converts DC power into AC power;
• a power transmission unit including a power transmission coil that receives the AC power and generates an AC magnetic field;
• a current detection circuit that detects current output from the inverter;
• and
• a power transmission control circuit that controls the operation of the inverter, and
• the power transmission control circuit stops the operation of the inverter when the current detected by the current detection circuit exceeds a threshold current,
• the wireless power receiver includes:
• a power reception unit including a power reception coil;
• a rectifier circuit including first to fourth diodes and first and second capacitors and converting AC power into DC power, an anode of the first diode and a cathode of the second diode being connected to one output end of the power reception unit, an anode of the third diode and a cathode of the fourth diode being connected to the other output end of the power reception unit, and first and second capacitors being connected in parallel, respectively, to the third and fourth diodes;
• a protection circuit including a first switching element connected between the other output end of the power reception unit and an output end of the rectifier circuit;
• and
• a control circuit that controls ON/OFF operation of the first switching element based on an output voltage of the rectifier circuit and an inter-terminal voltage of the first or second capacitor.