Wireless power receiving apparatus
In a wireless power supply system, a first capacitor is arranged in series with an antenna. A second capacitor and a switch are arranged in series on a path arranged in parallel with the first capacitor. A control unit adjusts the duty ratio of the switch according to the frequency of an electric power signal.
1. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, transmitted from a wireless power supply apparatus, the wireless power receiving apparatus comprising:
a reception coil configured to receive the electric power signal;
an auxiliary coil and a capacitor arranged in series with the reception coil;
a switch arranged in parallel with the auxiliary coil; and
a control circuit for controlling an ON/OFF operation of the switch with a duty ratio that corresponds to the frequency of the electric power signal.
2. A wireless power receiving apparatus according to claim 1 , wherein the control circuit controls the switch in synchronization with a current that flows through the reception coil.
3. A wireless power receiving apparatus according to claim 1 , wherein the control circuit controls the switch such that the amplitude of a current that flows through the reception coil becomes its maximum value in an ON period of the switch.
4. A wireless power supply system comprising:
a wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and
a wireless power receiving apparatus according to claim 1 , configured to receive the electric power signal.
5. A wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, the wireless power supply apparatus comprising:
a transmission coil configured to transmit the electric power signal; an auxiliary coil and a capacitor arranged in series with the transmission coil;
a switch arranged in parallel with the auxiliary coil; and
a control circuit for controlling an ON/OFF operation of the switch with a duty ratio that corresponds to the frequency of the electric power signal.
6. A wireless power supply apparatus according to claim 5 , wherein the control circuit controls the switch in synchronization with a current that flows through the transmission coil.
7. A wireless power supply apparatus according to claim 5 , wherein the control circuit controls the switch such that the amplitude of a current that flows through the transmission coil becomes its maximum value in an ON period of the switch.
8. A wireless power supply system comprising:
a wireless power supply apparatus according to claim 5 , configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and
a wireless power receiving apparatus configured to receive the electric power signal.