Monitoring for foreign bodies during inductive charging
First Claim
1. A device having a charging unit and being configured for inductive power transmission from the charging unit to a vehicle, wherein the charging unit comprises a primary coil and the vehicle comprises a secondary coil and in which the primary coil generates a magnetic transmission field in a transmission range between the primary coil and the secondary coil, whereinthe vehicle comprises a sensor unit for temperature monitoring in the transmission range,the charging unit comprises a control unit,the transmission power being controlled by the control unit during a charging operation as a function of a result of said temperature monitoring,wherein the transmission power is maintained by the control unit at a first rate of power increase until an earlier of an expiration of a predetermined period of time and a detection of a critical object,wherein the transmission power is increased by the control unit to a second rate of power increase in response to the expiration of the predetermined critical period of time and no detection of the critical object, andwherein an object having thermal properties above a thermal resolution limit and spatial properties above a spatial resolution limit is designated as the critical object.
1 Assignment
0 Petitions
Accused Products
Abstract
A device having a charging unit and being configured for inductive power transmission from the charging unit to a vehicle, in which the charging unit comprises a primary coil and the vehicle comprises a secondary coil and in which the primary coil generates a magnetic transmission field in a transmission range between the primary coil and the secondary coil, wherein the vehicle has a sensor unit for temperature monitoring in the transmission range, the charging unit comprises a control unit and in a charging operation the transmission power can be controlled by the control unit as a function of a result of temperature monitoring.
6 Citations
4 Claims
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1. A device having a charging unit and being configured for inductive power transmission from the charging unit to a vehicle, wherein the charging unit comprises a primary coil and the vehicle comprises a secondary coil and in which the primary coil generates a magnetic transmission field in a transmission range between the primary coil and the secondary coil, wherein
the vehicle comprises a sensor unit for temperature monitoring in the transmission range, the charging unit comprises a control unit, the transmission power being controlled by the control unit during a charging operation as a function of a result of said temperature monitoring, wherein the transmission power is maintained by the control unit at a first rate of power increase until an earlier of an expiration of a predetermined period of time and a detection of a critical object, wherein the transmission power is increased by the control unit to a second rate of power increase in response to the expiration of the predetermined critical period of time and no detection of the critical object, and wherein an object having thermal properties above a thermal resolution limit and spatial properties above a spatial resolution limit is designated as the critical object.
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4. A method for charging a vehicle by inductive power transmission using a charging unit comprising
generating a magnetic transmission field in a transmission range between a primary coil of the charging unit and a secondary coil of the vehicle; -
monitoring temperature in the transmission range by a sensor unit of the vehicle; increasing the transmission power, by a control unit of the charging unit, at the first rate of power increase until an earlier of an expiration of a predetermined period of time and a detection of a critical object; increasing the transmission power, by the control unit, at the second rate of power increase in response to the expiration of the critical period of time and no detection of the critical object; and interrupting and/or reducing, by the control unit, the transmission power after the detection of the critical object during the predetermined critical period of time or after the predetermined critical period of time, and wherein an object having thermal properties above a thermal resolution limit and spatial properties above a spatial resolution limit is designated as the critical object.
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Specification