Wireless charger and wireless power receiver
First Claim
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1. A wireless charger, comprising:
- a transmitting coil;
a shielding element formed of a conductive material; and
an impedance matching circuit configured to connect a power source to the transmitting coil,wherein the impedance matching circuit comprises;
at least two capacitors each having a first end connected to the transmitting coil in parallel and a second end connected to each other, wherein each of the at least two capacitors connects a different tap of the transmitting coil to a ground of the power source and to the shielding element; and
a third capacitor having a first end and a second end, wherein the first end of the third capacitor is connected to a center tap of the transmitting coil and the second end of the third capacitor is connected to the ground of the power source and each second end of the at least two capacitors, andwherein the at least two capacitors and the third capacitor are configured to shunt in-phase currents that flow into the transmitting coil and thereby reduce electromagnetic emissions.
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Abstract
A wireless charging system and method are provided, that are capable of simultaneously charging multiple mobile devices, providing high power transfer efficiency for multiple mobile devices located at any position and orientation, and minimizing electromagnetic radiation from a transmitting (TX) coil and a receiving (RX) coil. The method and structure reduce electromagnetic interference (EMI) radiation by shunting in-phase currents flowing in a wireless power transmitting unit (TX unit) and a wireless power receiving unit (RX unit) of a wireless charging system.
19 Citations
19 Claims
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1. A wireless charger, comprising:
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a transmitting coil; a shielding element formed of a conductive material; and an impedance matching circuit configured to connect a power source to the transmitting coil, wherein the impedance matching circuit comprises; at least two capacitors each having a first end connected to the transmitting coil in parallel and a second end connected to each other, wherein each of the at least two capacitors connects a different tap of the transmitting coil to a ground of the power source and to the shielding element; and a third capacitor having a first end and a second end, wherein the first end of the third capacitor is connected to a center tap of the transmitting coil and the second end of the third capacitor is connected to the ground of the power source and each second end of the at least two capacitors, and wherein the at least two capacitors and the third capacitor are configured to shunt in-phase currents that flow into the transmitting coil and thereby reduce electromagnetic emissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless charging system, comprising:
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a wireless power transmitting unit comprising; a transmitting coil, a power source, a shielding element, and a first impedance matching circuit configured to connect the transmitting coil to the power source, wherein the first impedance matching circuit comprises at least two capacitors each having a first end connected to the transmitting coil in parallel and a second end connected to each other, wherein each of the at least two capacitors connects a different tap of the transmitting coil to a ground of the power source and to the shielding element, wherein the first impedance matching circuit further comprises a third capacitor having a first end and a second end, wherein the first end of the third capacitor is connected to a center tap of the transmitting coil and the second end of the third capacitor is connected to the ground of the power source and each second end of the at least two capacitors, and wherein the at least two capacitors and the third capacitor are configured to shunt in-phase currents that flow into the transmitting coil and thereby reduce electromagnetic emissions; and a wireless power receiving unit comprising; a rectifier which is connectable to a battery, a receiving coil, a load, and a second impedance matching circuit configured to connect the receiving coil to the rectifier, wherein the second impedance matching circuit comprises at least two receiving unit capacitors which are connected to the receiving coil in parallel and connect the receiving coil to a ground of the battery. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification