Method and system for reducing harmonics in a rectified incoming wireless power transfer signal at a receiver of an electric vehicle
AssigneeElectreon Wireless Ltd.
InventorHanan RUMBAK
Life of this patent
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Abstract
A system and method for reducing harmonics in a rectified incoming wireless power transfer signal at a receiver of an electrical vehicle are provided herein. The electrical vehicle receiver shall be equipped with a two-stage filter which shall reduce the harmonics post rectifying of the alternating current inducted at the receiver coils. Advantageously, using a specially designed capacitor, an effective reduction of the harmonics is achieved for power efficiency and electromagnetic compliance (EMC). The design is challenging due to the high amperage and frequency range of the alternating current.
Claims14
A vehicle assembly for operating with a ground assembly as part of a wireless power transmission system for electric vehicles, the vehicle assembly comprising:
- a resonance circuitry connected to power receiving coils, couplable with transmission coils of the ground assembly;
- a rectifier connected to the resonance circuitry and configured to rectify alternating current coming from the resonance circuity, yielding a rectified signal;
- a pre-filter connected to an output of the rectifier and configured to attenuate harmonics of order 2 to 10 of the rectified signal, yielding a pre-filtered signal;
- and
- a filter connected to an output of the pre-filter and configured to attenuate harmonics of order higher than 10 of the pre-filtered signal, yielding a filtered signal.
A method for reducing harmonics in a rectified incoming wireless power transfer signal at a vehicle assembly for operating with a ground assembly as part of a wireless power transmission system for electric vehicles, the method comprising:
- rectifying, by a rectifier, an alternating current coming from a resonance circuitry connected to power receiving coils, couplable with transmission coils of the ground assembly, yielding a rectified signal;
- attenuating, by a pre-filter, harmonics of order 2 to 10 of the rectified signal, yielding a pre-filtered signal;
- and
- attenuating, by a filter, harmonics of order higher than 10 of the pre-filtered signal, yielding a filtered signal.
Dependencies are inferred from the claim text.