Moving object, wireless power feeding system, and wireless power feeding method

• US 9,114,718 B2
• Filed: 01/03/2014
• Issued: 08/25/2015
• Est. Priority Date: 02/05/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Koyama, Jun, Shionoiri, Yutaka
• Primary Examiner(s): DIAO, M BAYE
• Application Number:
  US14/147,235
• Publication Number:
  US 20140117932A1
• Time in Patent Office: 599 Days
• Field of Search: 320/108, 320/104, 320/109
• US Class Current: 1/1
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2200/32 Waterborne vessels
• CPC Class Codes: B60L 2200/34 Wheel chairs
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

An object is to provide a moving object structure capable of reducing power loss caused when power is supplied from a power feeding device to a moving object by wireless communication. Another object is to provide a moving object structure capable of reducing the strength of a radio wave radiated to the surroundings. Before power is supplied to a moving object, a radio wave for alignment of antennas is output from a power feeding device. That is, radio waves are output from a power feeding device in two stages. In a first stage, a radio wave is output to align positions of antennas of the power feeding device and the moving object. In a second stage, a radio wave is output to supply power from the power feeding device to the moving object.

Claims

1. A power receiving device comprising:

an antenna circuit configured to generate a first electric signal and a second electric signal from a first radio wave and a second radio wave sequentially transmitted from a power feeding device, respectively;

a signal processing circuit configured to extract data on a positional relationship between the antenna circuit and the power feeding device, using the first electric signal;

a secondary battery configured to store electric energy using the second electric signal;

an oscillator circuit configured to generate a signal having a certain frequency; and

a modulation circuit configured to apply a voltage to the antenna circuit in accordance with a start signal and the signal having the certain frequency,

wherein the start signal is generated in the signal processing circuit.

2. The power receiving device according to claim 1,

wherein the antenna circuit comprises an antenna including a conductor that has a spiral shape, and a capacitor.

3. The power receiving device according to claim 1,

wherein the antenna circuit is configured to transmit a third radio wave which is generated in accordance with the start signal, to the power feeding device.

4. The power receiving device according to claim 1, further comprising an output device configured to output the extracted data.

5. A power receiving device comprising:

an antenna circuit configured to generate a first electric signal and a second electric signal from a first radio wave and a second radio wave sequentially transmitted from a power feeding device, respectively;

a rectifier circuit configured to rectify the first electric signal and the second electric signal;

a signal processing circuit configured to extract data on a positional relationship between the antenna circuit and the power feeding device, using the first electric signal which is rectified;

a secondary battery configured to store electric energy using the second electric signal which is rectified;

an oscillator circuit configured to generate a signal having a certain frequency; and

a modulation circuit configured to apply a voltage to the antenna circuit in accordance with a start signal and the signal having the certain frequency,

wherein the start signal is generated in the signal processing circuit.

6. The power receiving device according to claim 5,

wherein the antenna circuit comprises an antenna including a conductor that has a spiral shape, and a capacitor.

7. The power receiving device according to claim 5,

wherein the antenna circuit is configured to transmit a third radio wave which is generated in accordance with the start signal, to the power feeding device.

8. The power receiving device according to claim 5, further comprising an output device configured to output the extracted data.

9. A power receiving device comprising:

an antenna circuit configured to generate a first electric signal and a second electric signal from a first radio wave and a second radio wave sequentially transmitted from a power feeding device, respectively;

a rectifier circuit configured to rectify the first electric signal and the second electric signal;

a signal processing circuit configured to extract data on a positional relationship between the antenna circuit and the power feeding device, using the first electric signal which is rectified;

a secondary battery configured to store electric energy using the second electric signal which is rectified;

an oscillator circuit configured to generate a signal having a certain frequency; and

a modulation circuit configured to apply a voltage to the antenna circuit in accordance with a start signal and the signal having the certain frequency,

wherein the start signal is generated in the signal processing circuit, and

wherein at least one of the rectifier circuit, the signal processing circuit and the modulation circuit comprises a transistor including an oxide semiconductor layer.

10. The power receiving device according to claim 9,

wherein the antenna circuit comprises an antenna including a conductor that has a spiral shape, and a capacitor.

11. The power receiving device according to claim 9,

wherein the antenna circuit is configured to transmit a third radio wave which is generated in accordance with the start signal, to the power feeding device.

12. The power receiving device according to claim 9, further comprising an output device configured to output the extracted data.