RECTIFYING APPARATUS

摘要

A rectifying apparatus (power receiving apparatus) 100 is configured to receive electric power output from the power transmitting apparatus 101. The rectifying apparatus 100 is mobile equipment, such as a battery, a smartphone incorporating a battery and a tablet PC, or equipment for a battery charger connected to the equipment. The rectifying apparatus (power receiving apparatus) 100 may be any other equipment that receives electric power output from the associated power transmitting apparatus 101, including a rechargeable electric car, a household appliance and a product for underwater application.

主权项

1. A rectifying apparatus that receives electric power transmitted from a power transmitting apparatus by wireless power transmission, and rectifies a resulting current and outputs the rectified current, comprising:
a power receiving coil connected between a first power receiving terminal and a second power receiving terminal, and configured to be electromagnetically coupled with a power transmitting coil in the power transmitting apparatus; a power receiving capacitor connected in series with the power receiving coil between the first power receiving terminal and the second power receiving terminal; a first pMOS transistor connected to an output terminal at a source thereof and to the first power receiving terminal at a drain thereof; a second pMOS transistor connected to the output terminal at a source and to the second power receiving terminal at a drain thereof; a first nMOS transistor connected to the first power receiving terminal at a drain thereof and to a fixed potential at a source thereof; a second nMOS transistor connected to the second power receiving terminal at a drain thereof and to the fixed potential at a source thereof; a current detecting circuit that detects a load current flowing between a load terminal to which a load is connected and the output terminal and outputs a current detection signal responsive to a result of comparison between the load current and a threshold; a first voltage detecting circuit that detects a voltage between the first power receiving terminal and the fixed potential or between the output terminal and the first power receiving terminal; a second voltage detecting circuit that detects a voltage between the second power receiving terminal and the fixed potential in a case where the first voltage detecting circuit detects the voltage between the first power receiving terminal and the fixed potential, and detects a voltage between the output terminal and the second power receiving terminal in a case where the first voltage detecting circuit detects the voltage between the output terminal and the first power receiving terminal; a first controlling circuit that controls the first pMOS transistor based on a result of detection by the second voltage detecting circuit; a second controlling circuit that controls the second pMOS transistor based on a result of detection by the first voltage detecting circuit; a third controlling circuit that controls the first nMOS transistor based on the current detection signal and the result of detection by the first voltage detecting circuit; and a fourth controlling circuit that controls the second nMOS transistor based on the current detection signal and the result of detection by the second voltage detecting circuit.