Wireless charger having E-field shield

摘要

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.

主权项

1. 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.