INPUT PARASITIC METAL DETECTION
First Claim
1. A method of detecting an unacceptable amount of parasitic metal in proximity to a primary unit, the method comprising:
- transferring contactless energy from a primary unit to a secondary device;
measuring one or more characteristics of power in the primary unit to obtain a first value representative of the amount of power transferred from the primary unit;
receiving information from the secondary device to obtain a second value representative of the amount of power received by the secondary device;
estimating power loss in at least one of the primary unit and the secondary device, wherein the estimated power loss varies based on at least one of the amount of power transferred from the primary unit and the amount of power received by the secondary device;
determining whether there is an unacceptable amount of parasitic metal in proximity to the primary unit based on the first value representative of the amount of power transferred from the primary unit, the second value representative of the amount of power received by the secondary device, and a third value representative of acceptable power loss, wherein acceptable power loss varies based on at least one of the first value and the second value.
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Accused Products
Abstract
A system and method of controlling inductive power transfer in an inductive power transfer system and a method for designing an inductive power transfer system with power accounting. The method of controlling inductive power transfer including measuring a characteristic of input power, a characteristic of power in the tank circuit, and receiving information from a secondary device. Estimating power consumption based on the measured characteristic of tank circuit power and received information and comparing the measured characteristic of input power, the information from the secondary device, and the estimated power consumption to determine there is an unacceptable power loss. The method for designing an inductive power transfer system with power accounting including changing the distance between a primary side and a secondary side and changing a load of the secondary side. For each distance between the primary side and the secondary side and for each load, measuring a circuit parameter on the primary side in the tank circuit and a circuit parameter on the secondary side during the transfer of contactless energy. The method further including selecting a formula to describe power consumption in the system during the transfer of contactless energy based on coefficients and the circuit parameters, and determining the coefficients using the measured circuit parameters.
5 Citations
21 Claims
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1. A method of detecting an unacceptable amount of parasitic metal in proximity to a primary unit, the method comprising:
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transferring contactless energy from a primary unit to a secondary device; measuring one or more characteristics of power in the primary unit to obtain a first value representative of the amount of power transferred from the primary unit; receiving information from the secondary device to obtain a second value representative of the amount of power received by the secondary device; estimating power loss in at least one of the primary unit and the secondary device, wherein the estimated power loss varies based on at least one of the amount of power transferred from the primary unit and the amount of power received by the secondary device; determining whether there is an unacceptable amount of parasitic metal in proximity to the primary unit based on the first value representative of the amount of power transferred from the primary unit, the second value representative of the amount of power received by the secondary device, and a third value representative of acceptable power loss, wherein acceptable power loss varies based on at least one of the first value and the second value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A primary unit for transferring power to a secondary device, said primary unit including:
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a primary coil for transferring contactless power from a primary unit to a secondary device; one or more sensors measuring one or more characteristics of power in the primary unit representative of information about the amount of power transmitted from the primary unit; a receiver for receiving information about the amount of power received by a secondary device; a controller configured to determine whether there is an unacceptable amount of parasitic metal in proximity to the primary unit based on the one or more characteristics of power in the primary unit representative of information about the amount of power transmitted from the primary unit, the received information about the amount of power received by a secondary device, and a value representative of acceptable power loss wherein the acceptable power loss varies with at least one of the amount of power transferred from the primary unit and the amount of power received by the secondary device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of detecting an unacceptable amount of parasitic metal in proximity to a primary unit, the method comprising:
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transferring contactless energy from a primary unit to a secondary device; obtaining information about the amount of power transferred from the primary unit; obtaining information about the amount of power received by the secondary device; estimating acceptable power loss, wherein the estimated power loss varies based on at least one of the amount of power transferred from the primary unit and the amount of power received by the secondary device; and determining whether there is an unacceptable amount of parasitic metal in proximity to the primary unit based on the amount of power transferred from the primary unit, the amount of power received by the secondary device, and the estimated power loss. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification