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, 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;
detecting an internal temperature of the induction charging device; and
multiplying the actual quality by a correction factor based on the internal temperature,wherein a profile of the correction factor at higher internal temperatures above room temperature is leveled off relative to the detected temperature.
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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 internal temperature of induction charging device is detected, in particular, during the wireless energy transmission, and the actual quality is multiplied by a correction factor based on the internal temperature. Also, an induction charging device is described that includes an oscillator circuit and a control and regulating unit, as well as at least one temperature sensor for carrying out the method.
9 Citations
12 Claims
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1. A method for foreign object detection for an induction charging device including an oscillator circuit, 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; detecting an internal temperature of the induction charging device; and multiplying the actual quality by a correction factor based on the internal temperature, wherein a profile of the correction factor at higher internal temperatures above room temperature is leveled off relative to the detected temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An induction charging device, comprising:
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an oscillator circuit; 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, and determines whether a foreign object is present based on a defined setpoint quality range; and at least one temperature sensor for detecting an internal temperature of the induction charging device, wherein the control and regulating unit multiplies the actual quality by a correction factor based on the internal temperature, wherein a profile of the correction factor at higher internal temperatures above room temperature is leveled off relative to the detected temperature. - View Dependent Claims (10, 11, 12)
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Specification