SWEEP FREQUENCY MODE FOR MAGNETIC RESONANT POWER TRANSMISSION
First Claim
1. A power transmission pad for wireless power transmission comprising:
- a. a coil;
b. a power transmitter having a sweep frequency generator coupled to the coil to provide a frequency varying signal through the coil, thereby generating a variable magnetic field; and
c. a controller coupled to the coil and to the sweep frequency generator, wherein when a portable electronic device to be charged is positioned within the variable magnetic field generated by the power transmission pad, the controller is configured to determine a resonant frequency corresponding to a maximum energy transfer from the power transmission pad to the portable electronic device, and the resonant frequency is locked for power transmission from the power transmission pad to the portable electronic device.
1 Assignment
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Accused Products
Abstract
A power transmission pad is configured to provide wireless power transmission to a receiving device where the receiving device is orientation-free relative to the pad. The pad functions as a transmitter and is magnetically “hot”, meaning the pad generates a magnetic field when powered on. The receiving device, such as a cell phone, tablet, or other portable electronic device, is placed within the magnetic field for the purpose of charging the device battery. In contrast to conventional wireless battery charging systems, there are no restrictions on the orientation of the receiving device relative to the pad. The power transmission pad includes a sweep frequency generator for generating power transmissions across a frequency spectrum. An optimal frequency is determined for maximum energy transfer to the receiving device, and the sweep frequency generator is locked to the determined optimal frequency.
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Citations
21 Claims
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1. A power transmission pad for wireless power transmission comprising:
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a. a coil; b. a power transmitter having a sweep frequency generator coupled to the coil to provide a frequency varying signal through the coil, thereby generating a variable magnetic field; and c. a controller coupled to the coil and to the sweep frequency generator, wherein when a portable electronic device to be charged is positioned within the variable magnetic field generated by the power transmission pad, the controller is configured to determine a resonant frequency corresponding to a maximum energy transfer from the power transmission pad to the portable electronic device, and the resonant frequency is locked for power transmission from the power transmission pad to the portable electronic device.
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2. A system for wireless power transmission comprising:
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a. a power transmission pad comprising; i. a first coil; ii. a power transmitter having a sweep frequency generator coupled to the first coil to provide a frequency varying signal through the coil, thereby generating a variable magnetic field; and iii. a controller coupled to the first coil and to the sweep frequency generator; b. a portable electronic device to be charged comprising; i. a second coil; and ii. a power receiver coupled to the second coil and configured to receive energy transferred from the power transmission pad via the second coil, wherein when the portable electronic device is positioned within the variable magnetic field generated by the power transmission pad, the controller is configured to determine a resonant frequency corresponding to a maximum energy transfer from the power transmission pad to the portable electronic device, and the resonant frequency is locked for power transmission from the power transmission pad to the portable electronic device. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of wireless power transmission between a power transmission pad and a portable electronic device to be charged, the method comprising:
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a. configuring the power transmission pad with a first coil and a sweep frequency generator, and the portable electronic device with a second coil; b. generating a variable magnetic field by applying the sweep frequency generator to the first coil; c. measuring a system characteristic in response to the variable magnetic field; d. determining a resonant frequency of the portable electronic device according to the measured system characteristic; e. locking an energy transmission frequency of the power transmission pad to the resonant frequency; and f. transmitting power from the power transmission pad to the portable electronic device using the locked energy transmission frequency. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification