Tuning circuit and method for wireless power transfer systems
First Claim
1. A wireless power receiver comprising:
- an inductive element configured to receive wireless power from an electromagnetic field associated with a wireless power transmitter;
a circuit comprising a plurality of capacitive elements connected to the inductive element, the plurality of capacitive elements configured to supply an output current to a load; and
a controller configured to selectively connect the plurality of capacitive elements to the inductive element in a plurality of configurations, the plurality of capacitive elements presenting substantially a same total reactance to the inductive element in each of the plurality of configurations, each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, and each of the plurality of configurations providing a different output current to the load for a given base current in a primary inductor of the wireless power transmitter.
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0 Petitions
Accused Products
Abstract
This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote systems such as electric vehicles. In one aspect, a wireless power transfer system includes a transmitter and a receiver. The transmitter includes a first inductive element and a current generator. The current generator supplies a current to the first inductive element to generate an electromagnetic field. The receiver includes a second inductive element, a tuning circuit, and a controller. The second inductive element receives wireless power from the electromagnetic field. The tuning circuit has a reactance and includes a plurality of capacitive elements connected to the second inductive element. The plurality of capacitive elements supply an output current to a load. The controller selectively connects the plurality of capacitive elements in a plurality of configurations. The tuning circuit has substantially the same reactance in each of the plurality of configurations.
19 Citations
24 Claims
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1. A wireless power receiver comprising:
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an inductive element configured to receive wireless power from an electromagnetic field associated with a wireless power transmitter; a circuit comprising a plurality of capacitive elements connected to the inductive element, the plurality of capacitive elements configured to supply an output current to a load; and a controller configured to selectively connect the plurality of capacitive elements to the inductive element in a plurality of configurations, the plurality of capacitive elements presenting substantially a same total reactance to the inductive element in each of the plurality of configurations, each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, and each of the plurality of configurations providing a different output current to the load for a given base current in a primary inductor of the wireless power transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for receiving wireless power comprising:
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receiving with an inductive element wireless power from an electromagnetic field associated with a wireless power transmitter; and selectively connecting a plurality of capacitive elements of a circuit to the inductive element in one of a plurality of configurations, the circuit comprising the plurality of capacitive elements connected to the inductive element, the plurality of capacitive elements presenting substantially a same total reactance to the inductive element in each of the plurality of configurations, each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, each of the plurality of configurations providing a different output current to the load for a given base current in a primary inductor of the wireless power transmitter, and the plurality of capacitive elements configured to supply an output current to a load. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless power receiver comprising:
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means for receiving wireless power from an electromagnetic field associated with a wireless power transmitter; and means for selectively connecting a plurality of capacitive elements of a circuit to the inductive element in one of a plurality of configurations, the circuit comprising the plurality of capacitive elements connected to the means for receiving wireless power, the plurality of capacitive elements presenting substantially a same total reactance to the inductive element in each of the plurality of configurations and each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, each of the plurality of configurations providing a different output current to the load for a given base current in a primary inductor of the wireless power transmitter, and the plurality of capacitive elements configured to supply an output current to a load. - View Dependent Claims (20, 21, 22)
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23. A non-transitory, computer-readable medium comprising instructions that when executed cause a processor to perform a method of:
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receiving with an inductive element wireless power from an electromagnetic field associated with a wireless power transmitter; and selectively connecting a plurality of capacitive elements of a circuit to the inductive element in one of a plurality of configurations, the plurality of capacitive elements presenting substantially a same total reactance to the inductive element in each of the plurality of configurations and each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, each of the plurality of configurations providing a different output current to the load for a given base current in a primary inductor of the wireless power transmitter, and the plurality of capacitive elements configured to supply an output current to a load.
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24. A wireless power transfer system comprising:
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a transmitter comprising; a first inductive element; and a current generator configured to supply a current to the first inductive element to generate an electromagnetic field for transferring wireless power; and a receiver comprising; a second inductive element configured to receive wireless power from the electromagnetic field; a circuit comprising a plurality of capacitive elements connected to the second inductive element, the plurality of capacitive elements configured to supply an output current to a load; and a controller configured to selectively connect the plurality of capacitive elements to the first inductive element in a plurality of configurations, the plurality of capacitive elements presenting a substantially same total reactance to the inductive element in each of the plurality of configurations, each of the plurality of capacitive elements contributing to the total reactance in each of the plurality of configurations, and each of the plurality of configurations providing a different output current to the load for a given base current to the first inductive element.
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Specification