METHOD AND CHARGING BENCH VIA MAGNETIC COUPLING

• US 20130271071A1
• Filed: 04/11/2013
• Published: 10/17/2013
• Est. Priority Date: 04/12/2012
• Status: Active Grant

• Current Assignee: Continental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
• Original Assignee: Continental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
• Inventors: CHEIKH, Mohamed, VASSILIEFF, Youri
• Granted Patent: US 9,553,472 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A charging bench includes three coils that partially overlap, in superposed planes. An electrical feed makes it possible to supply the coils with an AC current from the mains. A portable device to be charged is placed on the upper side of this charging bench. This device includes a winding intended to receive the electrical charging, and a ferrite protective screen. One of the coils (Bb) is selected to emit the magnetic charging flux toward the mobile phone. The selection is carried out via the emission of a series of pulses by at least one of the coils and comparison of return signals with a reference threshold. This comparison also enables one of the other coils (Ba, Bc) to be selected or both of these other two coils (Ba, Bc) to be used to receive a flux for communicating information originating from the portable device to be charged.

Claims

1. A method for charging via magnetic coupling performing the functions of electrical charging of a portable electronic device (5) to be charged, called the secondary device (5), by a charging device or bench (1), called the primary device (1), comprising at least two coils (Ba, Bb, Bc;

B1, B2 . . . Bn), and of communicating information (8;

83, 84) originating from the secondary device (5) to the primary device (1),

the secondary device (5) being detected (I) then located (II) via the emission of a test signal (80) by at least one coil (Bb;

B2, B5) of the primary device (1), and the reception, in return, of a signal (51, 52) carrying information data (61, 62) by at least one coil (Bc;

B(n+1), B(n+2)),

the amplitude (VBn, VB(n+1), VB(n+2)) of the signal or signals received being compared to at least one reference threshold (K0.Vi;

K1.Vi, K2.Vi, K3.Vi),

the method being characterized in that;

in a selection phase (III), the coil (Bb;

B(n+1), B(n+2)) of the primary device (1) closest to the secondary device (5) is selected and then switched, by way of mode selecting means (33, 34), into a mode for charging via transmission of an energy flux (2), and

in the selection phase (III), the coil (Bc;

Bn, B(n+1)) of the primary device (1) located proximate this charging coil (Bb;

B(n+1), B(n+2)) is selected and then switched, by way of mode selecting means (33, 34), into a mode for communicating information data (61, 62) so as to actuate instructions contained in these data,

each coil (Bc;

Bb, Bn, B(n+1), B(n+2)) being able to function in a mode for communicating information data or in a mode for charging via transmission of an energy flux.

2. The charging method as claimed in claim 1, characterized in that the energy transmission (2) is achieved via inductive coupling between coils (Ba, Bb, Bc;

B1, B2, . . . , Bn) of the primary device (1) and at least one coil (6) of the secondary device (5) under magnetic resonance conditions.

3. The charging method as claimed in claim 1, in which the coils (Ba, Bb, Bc;

B1, B2, . . . , Bn) of the primary device (1) are electrically out of phase.

4. The charging method as claimed in claim 1, in which the test signal (80) consists of a series of brief pulses emitted by a smaller number of coils (B2, B5) regularly distributed in the array of coils (B1, B2 . . . , Bn) of the primary device (1).

5. The detection method as claimed in claim 1, in which a test signal (80) is emitted at regular intervals during charging in order to verify the amplitude of the return signal (83, 85) such as received by the coils (Bc;

B3, B5), and to switch the operating modes of the coils depending on a new location of the secondary device (5) when the amplitude of the signal received by the charging coil is compared to the reference threshold (K0.Vi, K1.Vi, K2.Vi, K3.Vi).

6. The detection method as claimed in claim 1, in which, when a plurality of secondary devices (5) to be charged are present, the operations of detection (I), location (II), and charge/communication selection (III) are carried out for each secondary device (5).

7. A charging bench (1) able to implement the method as claimed in claim 1, characterized in that it comprises:

means (10) for supplying electrical power,

a surface (3) for holding secondary devices (5) to be charged,

an array of coils consisting of at least two coils (Ba, Bb, Bc;

B1, B2, . . . , Bn),

at least one microcontroller (31) for processing information data originating from at least one secondary device (5),

at least one charging regulator (32), and

mode selecting means (33, 34) connected, for each coil (Ba, Bb, Bc;

B1, B2, . . . , Bn), to the microcontroller and the regulator in a circuit (30), said means consisting in a multipath communication selector (33), the output of which is connected to one end of each coil (Ba, Bb, Bc;

B1, B2, . . . , Bn) and the input of which is connected to the microcontroller (31) in order to provide it with information data, and in a multipath charging selector (34), the output of which is connected to the other end of each coil (Ba, Bb, Bc;

B1, B2, . . . , Bn) and the input of which is connected to the charging regulator (32) in order to enable emission of a flux (2) of electrical energy.

8. The charging bench (1) as claimed in claim 7, in which the coils (Ba, Bb, Bc;

B1, B2, . . . , Bn) are at least three in number and arranged in at least two superposed planes (P1, P2) that partially overlap one another.

9. The charging bench (1) as claimed in claim 7, in which the coils (Ba, Bb, Bc;

B1, B2, . . . , Bn) are mounted in an arrangement chosen from an arrangement in a line or network, especially a matrix, or spiral or circle.

10. The charging bench (1) as claimed in claim 8, in which the coils (Ba, Bb, Bc;

B1, B2, . . . , Bn) are mounted in an arrangement chosen from an arrangement in a line or network, especially a matrix, or spiral or circle.