Power reception device and wireless power transmission system including the same

A power reception device configured to receive power in a wireless manner from a power transmission device configured to perform a power conversion operation, comprising:

• a first capacitor electrically connected between a first power line and a second power line connected respectively to both ends of a power reception coil that receives power from the power transmission device;
• a voltage sensor configured to detect a voltage of the first power line with respect to the second power line;
• a current sensor configured to detect a current flowing through one of the first power line and the second power line;
• a crowbar circuit including a diode bridge which is implemented by a first diode, a second diode, a third diode and a fourth diode as well as a first switching element and a second switching element, and configured to rectify the full wave of AC power between the first power line and the second power line and output the rectified AC power to a positive electrode line and a negative electrode line;
• a second capacitor electrically connected between the second power line and the negative electrode line;
• and
• a controller configured to output a first control signal for making the first switching element conductive and a second control signal for making the second switching element conductive,
• the first diode having an anode connected to the negative electrode line and a cathode connected to the first power line,
• the second diode having an anode connected to the negative electrode line and a cathode connected to the second power line,
• the third diode having an anode connected to the first power line and a cathode connected to the positive electrode line,
• the fourth diode having an anode connected to the second power line and a cathode connected to the positive electrode line,
• the first switching element being connected in parallel to the first diode,
• the second switching element being connected in parallel to the second diode,
• in the case where a detection value of the current sensor indicates that the power reception device is not receiving power normally even though the power conversion operation of the power transmission device is being performed, the controller being configured to output at least one of the first control signal and the second control signal to the crowbar circuit after stopping the power conversion operation of the power transmission device so as to determine whether or not a malfunction is present in the crowbar circuit based on a detection value of the voltage sensor.