WIRELESS POWER RECEIVING APPARATUS

• US 20110316347A1
• Filed: 06/13/2011
• Published: 12/29/2011
• Est. Priority Date: 06/24/2010
• Status: Abandoned Application

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Endo, Yuki, Furukawa, Yasuo
• Application Number:
  US13/159,272
• Publication Number:
  US 20110316347A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power receiving apparatus receives an electric power signal including any one of an electric field, magnetic field, or electromagnetic field, transmitted from a wireless power supply apparatus. A resonance capacitor is arranged together with a reception coil to form a resonance circuit. A switch is provided in order to switch the state between a first state in which the load circuit is connected in series with the resonance circuit including the reception coil and the resonance capacitor and a second state in which the load circuit is disconnected from the resonance circuit. A control unit controls the switch so as to alternately switch the state between the first state and the second state in a time sharing manner.

Claims

1. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, magnetic field, or 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;

a resonance capacitor arranged together with the reception coil to form a resonance circuit;

a load circuit;

a switch configured to switch the state between a first state in which the load circuit is connected in series with the resonance circuit comprising the reception coil and the resonance capacitor and a second state in which the load circuit is disconnected from the resonance circuit; and

a control unit configured to control the switch so as to alternately switch the state between the first state and the second state in a time sharing manner.

2. A wireless power receiving apparatus according to claim 1, wherein the time ratio of the first state is 70% or less of the period of the overall switching operation.

3. A wireless power receiving apparatus according to claim 1, wherein the time ratio of the first state is 50% or less of the period of the overall switching operation.

4. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, magnetic field, or 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;

a resonance capacitor arranged together with the reception coil to form a resonance circuit;

a load circuit;

a first diode arranged on a loop that comprises the reception coil and the resonance capacitor; and

a second diode arranged between the cathode of the first diode and the load such that the cathode is arranged on the load side.

5. 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, magnetic field, or electromagnetic field; and

a wireless power receiving apparatus configured to receive the electric power signal, wherein

the wireless power receiving apparatus comprises;

a reception coil configured to receive the electric power signal;

a resonance capacitor arranged together with the reception coil to form a resonance circuit;

a load circuit;

a switch configured to switch the state between a first state in which the load circuit is connected in series with the resonance circuit comprising the reception coil and the resonance capacitor and a second state in which the load circuit is disconnected from the resonance circuit; and

a control unit configured to control the switch so as to alternately switch the state between the first state and the second state in a time sharing manner.

6. A wireless power supply system according to claim 5, wherein the time ratio of the first state is 70% or less of the period of the overall switching operation.

7. A wireless power supply system according to claim 5, wherein the time ratio of the first state is 50% or less of the period of the overall switching operation.

8. 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, magnetic field, or electromagnetic field; and

a wireless power receiving apparatus configured to receive the electric power signal, wherein

the wireless power receiving apparatus comprises;

a reception coil configured to receive the electric power signal;

a resonance capacitor arranged together with the reception coil to form a resonance circuit;

a load circuit;

a first diode arranged on a loop that comprises the reception coil and the resonance capacitor; and

a second diode arranged between the cathode of the first diode and the load such that the cathode is arranged on the load side.