WIRELESS POWER RECEIVING DEVICE

• US 20160197487A1
• Filed: 06/30/2014
• Published: 07/07/2016
• Est. Priority Date: 08/30/2013
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: SADAKATA, HIDEKI, FUJITA, ATSUSHI, OMORI, YOSHIHARU, KOIZUMI, MASAYOSHI, OHASHI, OSAMU
• Application Number:
  US14/909,394
• Publication Number:
  US 20160197487A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 53/126 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: 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 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• 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

Abstract

A wireless power receiving device for receiving power wirelessly is configured to include a resonant circuit including a power receiving coil and a resonant capacitor for receiving power from a power feeding coil; and a phase adjustment circuit that is provided at a rear stage of the resonant circuit and adjusts a phase difference between a power feeding coil current and a power receiving coil current at a specific frequency to cancel horizontal magnetic flux.

Claims

1. A wireless power receiving device for receiving power wirelessly, comprising:

a resonant circuit including a power receiving coil and a resonant capacitor for receiving power from a power feeding coil; and

a phase adjustment circuit that is provided at a rear stage of the resonant circuit and adjusts a phase difference between a power feeding coil current and a power receiving coil current at a specific frequency so as to cancel horizontal magnetic flux.

2. The wireless power receiving device according to claim 1,

wherein the phase adjustment circuit is a capacitor connected in parallel with the power receiving coil.

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

wherein the phase adjustment circuit is an inductor connected in series with the power receiving coil.

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

wherein the phase adjustment circuit includes a relay for switching operation of the phase adjustment circuit.

5. The wireless power receiving device according to claim 4,

wherein the relay is switched to operate the phase adjustment circuit when the specific frequency is used as a drive frequency.

6. The wireless power receiving device according to claim 5,

wherein the relay is switched, based on a phase difference between the power feeding coil current and the power receiving coil current, to operate the phase adjustment circuit.

7. The wireless power receiving device according to claim 1,

wherein the phase adjustment circuit is a variable capacitor connected in parallel with the power receiving coil.

8. The wireless power receiving device according to claim 7,

wherein capacitance of the variable capacitor is changed depending on a drive frequency so as to cancel the horizontal magnetic flux.

9. The wireless power receiving device according to claim 1,

wherein the power feeding coil and the power receiving coil can be a solenoid coil or a spiral coil.