TUNABLE WIRELESS POWER ARCHITECTURES
First Claim
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1. A wireless energy transfer system for transferring energy between a power supply and a load, comprising:
- a source resonator coil;
a device resonator coil inductively coupled to the source resonator coil;
a tunable switching amplifier driven by the power supply and driving the source resonator coil through a source impedance matching network, the switching amplifier having electronically controllable switching elements;
a tunable switching rectifier driving the load and receiving energy from the device resonator coil though a device impedance matching network, the switching rectifier having electronically controllable switching elements;
a source amplifier control configured to control a switching characteristic of the switching elements of the amplifier to regulate power extracted from the power supply; and
a rectifier control configured to control a switching characteristic of the switching elements of the rectifier to regulate a characteristic of an output presented to the load, the rectifier control communicatively coupled to the source amplifier control;
wherein the amplifier control provides a substantially fixed switching frequency to the switching elements of the amplifier.
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Abstract
Described herein are improved configurations for a wireless power transfer. The parameters of components of the wireless energy transfer system are adjusted to control the power delivered to the load at the device. The power output of the source amplifier is controlled to maintain a substantially 50% duty cycle at the rectifier of the device.
332 Citations
24 Claims
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1. A wireless energy transfer system for transferring energy between a power supply and a load, comprising:
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a source resonator coil; a device resonator coil inductively coupled to the source resonator coil; a tunable switching amplifier driven by the power supply and driving the source resonator coil through a source impedance matching network, the switching amplifier having electronically controllable switching elements; a tunable switching rectifier driving the load and receiving energy from the device resonator coil though a device impedance matching network, the switching rectifier having electronically controllable switching elements; a source amplifier control configured to control a switching characteristic of the switching elements of the amplifier to regulate power extracted from the power supply; and a rectifier control configured to control a switching characteristic of the switching elements of the rectifier to regulate a characteristic of an output presented to the load, the rectifier control communicatively coupled to the source amplifier control; wherein the amplifier control provides a substantially fixed switching frequency to the switching elements of the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for controlling energy to a load in a wireless energy transfer system, the method comprising:
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providing a source with an amplifier with a tunable duty cycle of its switching elements; providing a device with a rectifier having a tunable duty cycle of its switching elements, the rectifier communicatively coupled to the amplifier of the source; adjusting the duty cycle of the rectifier to meet the power demands at the output of the rectifier; and adjusting the duty cycle of the amplifier to obtain a substantially 50% duty cycle at the switching elements of the rectifier. - View Dependent Claims (22, 23, 24)
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Specification