Method for foreign object detection for an induction charging device and induction charging device
First Claim
1. A method for foreign object detection for an induction charging device including an oscillator circuit, the method comprising:
- detecting a resonance frequency and an associated actual quality of the oscillator circuit;
subsequently comparing the actual quality to a setpoint quality as a function of the resonance frequency;
determining whether a foreign object is present based on a defined setpoint quality range; and
adapting at least one of an upper limit and a lower limit of the setpoint quality range and a profile of the actual quality to one another.
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Accused Products
Abstract
A method for foreign object detection for an induction charging device is described, including an oscillator circuit, in particular, for a hand-held power tool, a resonance frequency and an associated actual quality of the oscillator circuit being detected and the actual quality is subsequently compared to a setpoint quality as a function of the resonance frequency and a decision is made about the presence of a foreign object based on a defined setpoint quality range. The method provides that an upper limit and/or a lower limit of the setpoint quality range and the profile of the actual quality are adapted to one another. Also described is an induction charging device including an oscillator circuit and a control and regulating unit for carrying out the method.
12 Citations
8 Claims
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1. A method for foreign object detection for an induction charging device including an oscillator circuit, the method comprising:
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detecting a resonance frequency and an associated actual quality of the oscillator circuit; subsequently comparing the actual quality to a setpoint quality as a function of the resonance frequency; determining whether a foreign object is present based on a defined setpoint quality range; and adapting at least one of an upper limit and a lower limit of the setpoint quality range and a profile of the actual quality to one another. - View Dependent Claims (2, 3, 4, 5)
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6. A method for foreign object for an induction charging device including an oscillator circuit, the method comprising:
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detecting a resonance frequency and an associated actual quality of the oscillator circuit; subsequently comparing the actual quality to a setpoint quality as a function of the resonance frequency; determining whether a foreign object is present based on a defined setpoint quality range; adapting at least one of an upper limit and a lower limit of the setpoint quality range and a profile of the actual quality to one another; correcting the actual quality by a correction factor in such a way that the profile is at least one of linear and constant; and multiplying the at least one of the upper limit and the lower limit of the setpoint quality range by the correction factor. - View Dependent Claims (7)
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8. An induction charging device, comprising:
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an oscillator circuit; and a control and regulating unit, wherein the control and regulating unit; detects a resonance frequency and an associated actual quality of the oscillator circuit, subsequently compares the actual quality to a setpoint quality as a function of the resonance frequency, determines whether a foreign object is present based on a defined setpoint quality range, and adapts at least one of an upper limit and a lower limit of the setpoint quality range and a profile of the actual quality to one another.
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Specification