US 9,520,740 B2Granted

Wireless charger having E-field shield

AssigneesVisteon Global Technologies, Inc., Powermat Technologies Ltd.

InventorsKaren Lee Chiles, John Robert Balint, III, Kevin Grady, Oola Greenwald, Gary O'Brien

Life of this patent

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Abstract

A shielding arrangement for preventing AM radio interference when a wireless charger is used in a vehicle has a plurality of parallel conductors arranged at a distance from one another responsive to a frequency desired to be attenuated. An interconnection arrangement includes a solid conductive junction and connects the conductors to one another without forming loops, and to ground. The conductors are traces disposed on a PCB. Additional parallel conducts are disposed on the other side of the PCB at an orthogonal orientation with respect to the first conductors. The spacing between the conductors is determined in response to the frequency desired to be attenuated, as well as frequencies thereabove that are desired to be propagated therethrough, such as mobile telephone signals. The solid conductive junction that is disposed on the printed circuit board is electrically and thermally conductive, such as copper.

Claims6

Dependent claims

A wireless charging arrangement for charging a handheld device, the wireless charging arrangement comprising:

a primary charging coil having an electrical input for receiving input electrical pulses, the input electrical pulses causing the primary charging coil to radiate a time-varying magnetic field and a time-varying electric field, responsive to the input electrical pulses;
and
an E-field shield that attenuates the time-varying electric field, the E-field shield interposed between the primary charging coil and the handheld device, and including:
a first plurality of substantially parallel conductors disposed on a first side of a printed circuit board;
a second plurality of substantially parallel conductors disposed on a second side of the printed circuit board in a substantially orthogonal angular orientation relative to the first parallel conductors, the second side of the printed circuit board being coplanar with and opposite the first side of the printed circuit board.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/845,254Filed 3 Sep 2015 · division
Priority: 13 Sep 2012
Published: US 2015/0380980 A131 Dec 2015
Granted: 13 Dec 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H01F 27/363
Electric or magnetic shields or screens: made of electrically conductive material
H01F 27/36
Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations,…:…
H01F 38/14
Adaptations of transformers or inductances for specific applications or functions: inductive couplings
H02J 7/04
For charging batteries from AC mains by converters: regulation of charging current or voltage

Family

Application13/613,282Parent of this division · filed 13 Sep 2012
US 2015/0380980 A1Pre-grant publication · published 31 Dec 2015
US 9,161,481 B2Parent of this division
US 2014/0070763 A1Published application
US 9,520,740 B2This patent

From the US filing history. Foreign family members aren’t listed.

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