Wireless power receiving device

A wireless power receiving device comprising:

• a power receiving resonant circuit including a power receiving coil and a resonant capacitor connected to the power receiving coil;
• a rectifier circuit configured to rectify a voltage of the power receiving resonant circuit;
• a voltage conversion circuit configured to convert an output voltage of the rectifier circuit;
• and
• a charge control circuit configured to charge an electric storage device with an output of the voltage conversion circuit, wherein
• the charge control circuit includes
• a received voltage detection circuit configured to detect a received voltage from the output voltage of the rectifier circuit, and
• a charging voltage detection circuit configured to detect a charging voltage from an output voltage of the voltage conversion circuit;
• and
• the charge control circuit is configured to
• start charging the electric storage device when the received voltage is greater than or equal to a first received voltage value,
• decrease a set value of a charging current for the electric storage device when the charging voltage is less than a predetermined charging voltage value,
• increase the set value of the charging current for the electric storage device when the received voltage is greater than or equal to a second received voltage value, the second received voltage value being higher than the predetermined charging voltage value, and
• maintain the set value of the charging current when the charging voltage is greater than or equal to the predetermined charging voltage value and the received voltage is less than the second received voltage value.