BUFFERING ENERGY STORAGE SYSTEMS FOR REDUCED GRID AND VEHICLE BATTERY STRESS FOR IN-MOTION WIRELESS POWER TRANSFER SYSTEMS
First Claim
Patent Images
1. A receiver circuit for wireless power transfer comprising:
- a receiver coil and a receiver capacitor connected to said receiver coil;
a rectifier circuit configured to receive a voltage across said receiver capacitor as an input and to generate an output voltage including a direct current component and an alternating current (AC) ripple component;
an electrochemical capacitor directly or indirectly connected to said output voltage; and
a vehicle battery directly or indirectly connected to said output voltage.
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Abstract
An energy buffer including an electrochemical capacitor can be added to the primary circuit and/or to the secondary circuit of in-motion wireless power transfer system. The energy buffer(s) can smoothen the power delivered by the power grid and captured by a vehicle passing over an array of transmit coils through in-motion wireless power transfer. The reduction in the transient power transfer can reduce the peak current that flows through various components of the in-motion wireless power transfer system including a vehicle battery on the vehicle, and prolong the life of the in-motion wireless power transfer system.
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Citations
20 Claims
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1. A receiver circuit for wireless power transfer comprising:
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a receiver coil and a receiver capacitor connected to said receiver coil; a rectifier circuit configured to receive a voltage across said receiver capacitor as an input and to generate an output voltage including a direct current component and an alternating current (AC) ripple component; an electrochemical capacitor directly or indirectly connected to said output voltage; and a vehicle battery directly or indirectly connected to said output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. A transmitter circuit for wireless power transfer comprising:
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an active front end (AFE) unit including input nodes configured to be connected to alternating current (AC) power from a power grid and output nodes configured to provide a unipolar output voltage; a high frequency inverter configured to convert said unipolar output voltage or a direct current (DC) voltage derived from said unipolar output voltage into an AC output voltage in a frequency range from 1 kHz to 1 MHz; at least one set of a primary coil and a primary capacitor connected to said high frequency inverter; and an electrochemical capacitor connected to nodes between said power grid and said high frequency inverter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification