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 which are connected to the transmitting coil in parallel and are configured to connect the transmitting coil to a ground of the power source and to the shielding element.
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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.
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Citations
16 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 which are connected to the transmitting coil in parallel and are configured to connect the transmitting coil to a ground of the power source and to the shielding element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless power receiver connectable to a battery, the wireless power receiver comprising:
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a receiving coil; and an impedance matching circuit configured to connect the receiving coil to the battery, wherein the impedance matching circuit comprises at least two capacitors which are connected to the receiving coil in parallel and are configured to connect the receiving coil to a ground of the battery. - View Dependent Claims (12, 13, 14, 15)
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16. 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 an impedance matching circuit configured to connect the transmitting coil to the power source, wherein the impedance matching circuit comprises at least two capacitors which are connected to the transmitting coil in parallel and connect the transmitting coil to a ground of the power source and to the shielding element; and a wireless power receiving unit comprising; a receiving coil, a load, and an impedance matching circuit configured to connect the receiving coil to the load, wherein the impedance matching circuit comprises at least two capacitors which are connected to the receiving coil in parallel and connect the receiving coil to a ground of the load.
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Specification