Wireless power receiving apparatus

• US 9,071,063 B2
• Filed: 08/25/2011
• Issued: 06/30/2015
• Est. Priority Date: 09/02/2010
• Status: Active Grant

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Endo, Yuki, Furukawa, Yasuo
• Primary Examiner(s): CAVALLARI, DANIEL J
• Application Number:
  US13/218,295
• Publication Number:
  US 20120056486A1
• Time in Patent Office: 1,405 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

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.

Claims

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.