Wireless power trnsfer device
AssigneeNingbo Weie Electronics Technology Ltd.
InventorBingchen CHE
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Abstract
The present disclosure discloses a wireless power transfer device. A power transmitting coil (or a power receiving coil) is equally divided into N equivalents by configuring a primary-side compensation capacitor (or a secondary side compensation capacitor) to comprise N sub-compensation capacitors which are connected in the power transmitting coil (or the power receiving coil) in an equally distributed manner. With the distributed capacitance connection structure, it is possible to reduce the voltage across each coil segment of the power transmitting coil (or the power receiving coil), thereby reducing the coil-to-ground common mode current of the transmitting coil and the circulating current caused by the receiving coil.
Claims20
A wireless power transfer device, comprising
- a power transmitting portion;
- and
- a power receiving portion configured to receive energy transmitted from said power transmitting portion to generate a predetermined output voltage driving a load;
- wherein said power transmitting portion comprises:
- an inverter circuit configured to receive a DC voltage signal to output an AC voltage signal;
- a power transmitting coil configured to receiving said AC voltage signal to transmit energy to said power receiving portion;
- and
- a primary-side compensation capacitor configured to compensating inductance of said power emitting coil so that a resonant frequency of a circuit comprising said power transmitting coil and said primary-side compensation capacitor coincides with an operating frequency of said wireless power transfer device;
- wherein said primary-side compensation capacitor comprises N sub-compensation capacitors coupled at different positions in said power transmitting coil in a distributed manner.
A wireless power transfer device, comprising:
- a power transmitting portion;
- and
- a power receiving portion comprising a power receiving coil and a secondary side compensation capacitor;
- wherein said secondary side compensation capacitor is configured to compensate inductance of said power receiving coil so that a resonant frequency of a circuit comprising said power receiving coil and said secondary side compensation capacitor coincides with an operating frequency of said wireless power transfer device;
- wherein said secondary side compensation capacitor comprising N sub-compensation capacitors coupled at different positions in said power receiving coil in a distributed manner.
Dependencies are inferred from the claim text.