Multi-mode wireless power transmitter
First Claim
1. A wireless power transmitter, comprising:
- an inverter configured to produce at its output a first signal having a first frequency or a second signal having a second frequency;
a first transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the first frequency;
a second transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the second frequency; and
at least one matching network coupled to the first transmit coil, the second transmit coil, and the output of the inverter, the at least one matching network being configured to provide power to the first transmit coil in response to the first signal and inhibit providing power to the second transmit coil in response to the first signal; and
a controller configured to detect a type of wireless power receiver in a vicinity of the wireless power transmitter and control the inverter to produce the first signal of the first frequency or the second signal of the second frequency based on the type of wireless power receiver detected,wherein an inductance of the first transmit coil is larger than an inductance of the second transmit coil.
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Accused Products
Abstract
Some embodiments relate to a multi-mode wireless power transmitter. The transmitter includes an inverter configured to produce at its output a first signal having a first frequency or a second signal having a second frequency. The transmitter also includes a first transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the first frequency. The transmitter also includes a second transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the second frequency. The transmitter further includes at least one matching network coupled to the first transmit coil, the second transmit coil, and the output of the inverter. The at least one matching network is configured to provide power to the first transmit coil in response to the first signal and inhibit providing power to the second transmit coil in response to the first signal.
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Citations
21 Claims
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1. A wireless power transmitter, comprising:
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an inverter configured to produce at its output a first signal having a first frequency or a second signal having a second frequency; a first transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the first frequency; a second transmit coil coupled to the output of the inverter and configured to wirelessly transmit power at the second frequency; and at least one matching network coupled to the first transmit coil, the second transmit coil, and the output of the inverter, the at least one matching network being configured to provide power to the first transmit coil in response to the first signal and inhibit providing power to the second transmit coil in response to the first signal; and a controller configured to detect a type of wireless power receiver in a vicinity of the wireless power transmitter and control the inverter to produce the first signal of the first frequency or the second signal of the second frequency based on the type of wireless power receiver detected, wherein an inductance of the first transmit coil is larger than an inductance of the second transmit coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless power transmission method, comprising:
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detecting, by a wireless power transmitter, a type of wireless power receiver present in a vicinity of the wireless power transmitter; determining, by the wireless power transmitter, a first frequency for wireless power transmission based on the type of wireless power receiver detected; the wireless power transmitter driving, by an inverter, a first transmit coil having a first inductance using a first signal having the first frequency; determining, by the wireless power transmitter, a second frequency for wireless power transmission suitable for wireless power delivery to a second receiver within wireless power transmission range of the wireless power transmitter; and the wireless power transmitter driving, by the inverter, a second transmit coil having a second inductance smaller than the first inductance using a second signal having the second frequency.
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20. A wireless power transmitter operable in plurality of modes of operation, the wireless power transmitter comprising:
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an inverter configured to produce at its output a first wireless power transmission signal having a first frequency when the wireless power transmitter is in a first mode of operation, or a second wireless power transmission signal having a second frequency when the wireless power transmitter is in the second mode of operation, wherein the first wireless power transmission frequency is different from the second wireless power transmission frequency; a matching network having at least one capacitor sized and connected to direct the first wireless power transmission signal to a first transmit coil and to direct the second wireless power transmission signal to a second transmit coil; and a controller coupled to the inverter and configured to control the inverter in the first mode of operation or the second mode of operation, wherein the controller is configured to detect a type of wireless power receiver in a vicinity of the wireless power transmitter and to determine a mode of operation of the wireless power transmitter based on the type of wireless power receiver detected, the mode of operation being the first mode of operation or the second mode of operation.
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21. A wireless power transmission method, comprising:
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detecting, by a wireless power transmitter, a type of wireless power receiver present in a vicinity of the wireless power transmitter; determining a mode of operation of the wireless power transmitter based on the type of wireless power receiver detected, the mode of operation being a first mode of operation or a second mode of operation; responsive to detecting a first type of wireless power receiver, controlling an inverter in the first mode of operation to produce a first wireless power transmission signal having a first frequency; providing the first wireless power transmission signal to a matching network that has a capacitance such that the first wireless power transmission signal is delivered to a first transmit coil; responsive to detecting a second type of wireless power receiver, controlling the inverter in the second mode of operation to produce a second wireless power transmission signal having a second frequency; and providing the second wireless power transmission signal to the matching network, wherein the capacitance of the matching network directs the second wireless power transmission signal to a second transmit coil.
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Specification