CONTACTLESS POWER RECEIVER AND METHOD OF OPERATION
First Claim
1. A contactless power receiver suitable for use in a near field inductively coupled power transfer system including:
- a. a pick up coil;
b. one or more semiconductor devices for controlling current flow through the pick up coil; and
c. a control circuit which drives at least one semiconductor device in linear mode over at least part of its range of operation to tune the power receiver based on the output of the contactless power receiver.
6 Assignments
0 Petitions
Accused Products
Abstract
A contactless power receiver is provided with a dynamically tuned pick up coil. The power transfer capacity of this power receiver is dynamically tuned using semiconductor devices that are operated in linear mode over part of their operation. The semiconductor devices are driven by a controller that is configured to implement a range of control strategies depending on system requirements. The semiconductor device may be used by itself or in conjunction with reactive elements to dynamically tune the pick up coil. In some implementations the contactless power receiver maybe configured to work with a consumer electronic or a wireless sensor device. The contactless power receiver can be integrated with the energy storage component of the device to provide a retrofit solution for existing products. The device can then be placed in vicinity of a planar magnetic field generated by a charging pad.
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Citations
20 Claims
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1. A contactless power receiver suitable for use in a near field inductively coupled power transfer system including:
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a. a pick up coil; b. one or more semiconductor devices for controlling current flow through the pick up coil; and c. a control circuit which drives at least one semiconductor device in linear mode over at least part of its range of operation to tune the power receiver based on the output of the contactless power receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 18, 19)
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- 11. In a contactless power system suitable for use in a near field inductively coupled power transfer system in which a power transmitter transmits power via a magnetic field to a pick up coil of a power receiver, a method of tuning the power receiver over at least part of its range of operation by operating a semiconductor device of the power receiver in linear mode to vary the resistance applied across the pick-up coil.
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20. A contactless power receiver suitable for use in a near field inductively coupled power transfer system including:
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a. pick up coil inputs; b. one or more semiconductor devices connected to the pick up coil inputs; and c. a control circuit which when in use with a pick up coil connected to the pick up coil inputs drives at least one semiconductor device in linear mode over at least part of its range of operation to tune the power receiver based on the output of the contactless power receiver.
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Specification