POWER RECEIVING DEVICE AND POWER TRANSFER SYSTEM

• US 20090058190A1
• Filed: 08/29/2008
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: TANAKA, Katsuyuki
• Granted Patent: US 7,919,886 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

There is provided a power receiving device capable of receiving a carrier wave transmitted from a power transmitting device without contact and obtaining electric power from the received carrier wave, which includes a carrier receiving section at least including a communication antenna having predetermined inductance and not equipped with an intermediate tap, to receive the carrier wave and generate an induced voltage corresponding to the carrier wave, a processing section to generate a drive voltage based on the induced voltage and perform data processing using the generated drive voltage, and an impedance converting section to convert impedance between the carrier receiving section and the processing section.

Claims

1. A power receiving device capable of receiving a carrier wave transmitted from a power transmitting device without contact and obtaining electric power from the received carrier wave, comprising:

a carrier receiving section at least including a communication antenna having predetermined inductance and not equipped with an intermediate tap, to receive the carrier wave and generate an induced voltage corresponding to the carrier wave;

a processing section to generate a drive voltage based on the induced voltage and perform data processing using the generated drive voltage; and

an impedance converting section to convert impedance between the carrier receiving section and the processing section.

2. The power receiving device according to claim 1, wherein the impedance converting section includes a first capacitor and a second capacitor each having predetermined capacitance and connected in series with each other,

the communication antenna, the first capacitor and the second capacitor constitute a resonance circuit, and

the impedance converting section divides an induced voltage generated in the resonance circuit.

3. The power receiving device according to claim 1, wherein

the carrier receiving section further includes a third capacitor having predetermined capacitance to constitute a resonance circuit, and

the impedance converting section includes a transformer.

4. The power receiving device according to claim 1, wherein

the carrier receiving section further includes a fourth capacitor having predetermined capacitance to constitute a resonance circuit, and

the impedance converting section includes an inductor having predetermined inductance and connected in series with the processing section and divides an induced voltage generated in the resonance circuit.

5. The power receiving device according to claim 1, wherein

the carrier receiving section further includes a fifth capacitor having predetermined capacitance to constitute a resonance circuit, and

the impedance converting section includes a sixth capacitor having predetermined capacitance and connected in series with the processing section and divides an induced voltage generated in the resonance circuit.

6. The power receiving device according to claim 1, wherein

the impedance converting section matches output impedance of the carrier receiving section and input impedance of the processing section.

7. A power transfer system comprises a power transmitting device to transmit a carrier wave, and a power receiving device capable of receiving the carrier wave transmitted from the power transmitting device without contact and obtaining electric power from the received carrier wave,

the power transmitting device including

a carrier signal generating section to generate a carrier signal;

and

a carrier transmitting section to transmit a carrier wave corresponding to the carrier signal, and

the power receiving device including

a carrier receiving section at least including a communication antenna having predetermined inductance and not equipped with an intermediate tap, to receive the carrier wave and generate an induced voltage corresponding to the carrier wave;

a processing section to generate a drive voltage based on the induced voltage and perform data processing using the generated drive voltage; and

an impedance converting section to convert impedance between the carrier receiving section and the processing section.