Object detection for a power transfer system
First Claim
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1. A power transfer system comprising:
- a transmitting device having a transmitting coil;
a receiving device having a receiving coil inductively coupleable to the transmitting coil for the purpose of transferring power, so that a power transfer path exists between the transmitting coil and the receiving coil;
an electrical load for connecting with terminals of the receiving coil, the electrical load including a low-resistance load or a short circuit;
a useful load for connecting with terminals of the receiving coil, the useful load including at least an accumulator;
a detection device for detecting an electrical parameter indicating an inductance of the transmitting coil, while the electrical load is connected to the receiving coil; and
a determination device for determining an object in the area of the power transfer path on the basis of the detected electrical parameter.
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Abstract
A power transfer system includes: a transmitting device having a transmitting coil and a receiving device having a receiving coil, the two coils being inductively coupleable to one another for the purpose of transferring power, so that a power transfer path exists between them; an electrical load for connecting with terminals of the receiving coil; a detection device for detecting an electrical parameter which indicates the inductance of the transmitting coil while the electrical load is connected to the receiving coil; and a determination device for determining an object in the area of the power transfer path on the basis of the detected parameter.
5 Citations
11 Claims
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1. A power transfer system comprising:
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a transmitting device having a transmitting coil; a receiving device having a receiving coil inductively coupleable to the transmitting coil for the purpose of transferring power, so that a power transfer path exists between the transmitting coil and the receiving coil; an electrical load for connecting with terminals of the receiving coil, the electrical load including a low-resistance load or a short circuit; a useful load for connecting with terminals of the receiving coil, the useful load including at least an accumulator; a detection device for detecting an electrical parameter indicating an inductance of the transmitting coil, while the electrical load is connected to the receiving coil; and a determination device for determining an object in the area of the power transfer path on the basis of the detected electrical parameter. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. A method for detecting an object in the area of an inductive power transfer path existing between a transmitting coil and a receiving coil which is inductively coupleable with the transmitting coil, the receiving coil being connected to a useful load which at least includes an accumulator, the method comprising:
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connecting an electrical load with terminals of the receiving coil, the electrical load including a low-resistance load or a short circuit; detecting an electrical parameter which indicates an inductance of the transmitting coil; determining the object on the basis of the detected electrical parameter; and separating the electrical load from the receiving coil again, when the electrical parameter has been detected. - View Dependent Claims (8, 9)
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10. A non-transitory, computer-readable data storage medium storing a computer program having program codes which, when executed on a computer, performs a method for detecting an object in the area of an inductive power transfer path existing between a transmitting coil and a receiving coil which is inductively coupleable with the transmitting coil, the receiving coil being connected to a useful load which at least includes an accumulator, the method comprising:
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connecting an electrical load with terminals of the receiving coil, the electrical load including a low-resistance load or a short circuit; detecting an electrical parameter which indicates an inductance of the transmitting coil; determining the object on the basis of the detected electrical parameter; and separating the electrical load from the receiving coil again, when the electrical parameter has been detected.
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Specification