REMOTE WIRELESS DRIVING CHARGER

• US 20120176085A1
• Filed: 01/04/2012
• Published: 07/12/2012
• Est. Priority Date: 01/04/2011
• Status: Abandoned Application

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: IIDA, Jun, UTSUNOMIYA, Kimitake
• Application Number:
  US13/343,139
• Publication Number:
  US 20120176085A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A remote wireless driving charger includes: a transmitter; a primary side resonance capacitor connected to the transmitter; a primary coil which is connected to the primary side resonance capacitor and is tuned to be resonant with the primary side resonance capacitor in a predetermined power carrier frequency band; a secondary coil embedded in a portable device; and a secondary side resonance capacitor which is connected to the secondary coil and is tuned to be resonant with the secondary coil in the predetermined power carrier frequency band. Radioactive inductance components as micro loops of the primary coil and the secondary coil are cancelled out by the non-radioactive primary side resonance capacitor and secondary side resonance capacitor through an electromagnetic coupling between the primary coil and the secondary coil, and the portable device is remotely and wirelessly charged.

Claims

1. A remote wireless driving charger comprising:

a transmitter;

a primary side resonance capacitor connected to the transmitter;

a primary coil which is connected to the primary side resonance capacitor and is tuned to be resonant with the primary side resonance capacitor in a predetermined power carrier frequency band;

a secondary coil embedded in a portable device; and

a secondary side resonance capacitor which is connected to the secondary coil and is tuned to be resonant with the secondary coil in the predetermined power carrier frequency band,

wherein radioactive inductance components as micro loops of the primary coil and the secondary coil are cancelled out by the non-radioactive primary side resonance capacitor and secondary side resonance capacitor through an electromagnetic coupling between the primary coil and the secondary coil, and the portable device is remotely and wirelessly charged.

2. The remote wireless driving charger of claim 1, further comprising:

a magnetic core transformer connected to an AC terminal;

a first diode bridge connected to the magnetic core transformer; and

a stabilization circuit connected to the first diode bridge,

wherein the transmitter is connected to the stabilization circuit.

3. The remote wireless driving charger of claim 1, wherein the predetermined power carrier frequency band is a shortwave to UHF band of 3 MHz to 3 GHz.

4. The remote wireless driving charger of claim 1, wherein both of the primary coil and the secondary coil have an equivalent radius of 2 cm to 10 cm, a number of winding turns of 1 to 10 and a copper volume of 1 cc to 10 cc.

5. The remote wireless driving charger of claim 1, wherein a Q value of self-resonance defined by a ratio of reactance of the primary coil and the secondary coil to radiation loss resistance is set to 50 or more.

6. The remote wireless driving charger of claim 1, wherein an indication of a power transmission efficiency calculated in the portable device is provided and the portable device is in a near field to 3 m range from the fixed remote wireless driving charger and adjusts the secondary coil to a direction giving maximal sensitivity at any position, and wireless power driving and charging is performed while using the portable device.

7. The remote wireless driving charger of claim 1, wherein, in a wireless power transmission in a near field to 3 m range, when a direction of the secondary coil relative to the primary coil is adjusted to provide a maximal receiving voltage, fast charging of 5 to 10 minutes is performed in the portable device and a sign of fast charging is indicated by an LED indicator connected to the transmitter.

8. The remote wireless driving charger of claim 1, wherein the transmitter controls tuning by detecting a resonance frequency of the primary coil and a resonance frequency of the secondary coil, respectively.

9. The remote wireless driving charger of claim 2, wherein a voltage obtained by dropping an AC voltage of the AC terminal through the magnetic core transformer and then bridge-rectifying the dropped AC voltage by means of the first diode bridge is converted into a low AC voltage in the stabilization circuit, which is then automatically adjusted to correspond to an AC input of the transmitter.

10. The remote wireless driving charger of claim 1, wherein the portable device transmits feedback information including detection information of an input voltage wirelessly and the remote wireless driving charger receives the feedback information and transmits the received feedback information to the transmitter.

11. The remote wireless driving charger of claim 1, wherein the portable device includes a second diode bridge connected to the secondary coil, a receiver connected to the second diode bridge, and a charging profile IC connected to the receiver, and transmits feedback information including detection information of the input voltage from the charging profile IC to the transmitter wirelessly.

12. The remote wireless driving charger of claim 11, wherein interactive communication is conducted between the transmitter and the charging profile IC.