SWEEP FREQUENCY MODE FOR MULTIPLE 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
b. a controller coupled to the coil and to the sweep frequency generator, wherein when one or more portable electronic devices to be charged are positioned within the variable magnetic field the power transmission pad is configured to determine a number of portable electronic devices positioned within the variable magnetic field and to adjust a power transmission level of a power transmission signal according to the determined number.
1 Assignment
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Accused Products
Abstract
A power transmission pad is configured to provide wireless power transmission to multiple portable electronic devices where each device is orientation-free relative to the pad. The power transmission pad is also configured to be power adaptive by changing the power transmission level depending on the number of devices being concurrently charged. Each device, is placed within the magnetic field for the purpose of charging the device battery. The power transmission pad includes a sweep frequency generator for generating power transmissions across a frequency spectrum. The number of devices to be charged is determined as well as an optimal frequency for maximum energy transfer to each device. A single combined optimal frequency is determined using the optimal frequencies determined for each individual device. The sweep frequency generator is locked to the single combined optimal frequency and a power transmission level is set according to the number of devices.
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Citations
35 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 b. a controller coupled to the coil and to the sweep frequency generator, wherein when one or more portable electronic devices to be charged are positioned within the variable magnetic field the power transmission pad is configured to determine a number of portable electronic devices positioned within the variable magnetic field and to adjust a power transmission level of a power transmission signal according to the determined number. - View Dependent Claims (2)
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3. A system for wireless power transmission comprising:
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a. one or more portable electronic devices to be charged; and b. a power transmission pad configured to generate a variable magnetic field, further wherein when the one or more portable electronic devices are positioned within the variable magnetic field the power transmission pad is configured to determine a number of portable electronic devices positioned within the variable magnetic field and to adjust a power transmission level of a power transmission signal according to the determined number. - View Dependent Claims (4)
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5. 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 first coil, thereby generating a variable magnetic field; and iii. a controller coupled to the first coil and to the sweep frequency generator; b. one or more portable electronic devices to be charged, each portable electronic device 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 one or more portable electronic devices are positioned within the variable magnetic field generated by the power transmission pad, the controller is configured to determine a number of portable electronic devices positioned within the variable magnetic field, to adjust a power transmission level of a power transmission signal according to the determined number, to determine a resonant frequency for each portable electronic device corresponding to a maximum energy transfer from the power transmission pad to the portable electronic device, and to determine a frequency of the power transmission signal using the determined resonant frequency of each portable electronic device. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of wireless power transmission between a power transmission pad and one or more portable electronic devices 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 each portable electronic device with a second coil; b. generating a variable magnetic field by applying the sweep frequency generator to the first coil; c. determining a number of portable electronic devices positioned within the variable magnetic field; d. adjusting a power transmission level of a power transmission signal according to the determined number; and e. transmitting the power transmission signal from the power transmission pad to the one or more portable electronic devices. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification