Inductive power supply and detection method of metallic foreign body thereof

Abstract

The invention discloses an inductive power supply used for transmitting the inductive power and detecting whether a metallic foreign body exists. The inductive power supply comprises a processing module for generating a control signal in accordance with a default data and a feedback signal; a drive module for converting a stable voltage source to a drive voltage in accordance with the control signal; an induction coil for electrically transferring the drive voltage for the induction power transmission; and a feedback module for generating the feedback signal in accordance with the drive voltage received by the induction coil, wherein the default data is an initial state of the inductive power supply and a sine wave amplitude corresponding to the drive voltage containing the initial state, and the metallic foreign body influence a sine wave amplitude corresponding to the feedback signal.

Description

technical field [0001] The present invention relates to an inductive power supply and a metal foreign object detection method thereof, in particular to an inductive power supply capable of performing an inductive power transmission and detecting whether there is a metal foreign object at the same time and a metal foreign object detection method thereof . Background technique [0002] In the known art, the most important problem related to electromagnetic induction power system is that it must be able to adaptively identify a rechargeable device placed on a transmitter coil waiting for the operation of inductive power transfer, in which the operation similar to that of an induction cooker for cooking will be used The principle is to generate high-power electromagnetic wave energy for inductive power transmission. During the working process, when the high-power electromagnetic wave energy is received by a foreign metal, the foreign metal will be heated due to the electromagne...

AI Technical Summary

Problems solved by technology

However, the power loss is not only caused by metal foreign objects. When the relative position of the power supply coil and the power receiving coil is shifted, the power loss will also increase. Therefore, the technology of this invention needs to first define the transmission / reception coil and other power conversion components. Power loss data, or the power loss data corresponding to all possible metal foreign objects measured in advance as a basis for judgment, and then compared according to the actual power loss changes detected during operation

However, it is still necessary to default the settings of different parameters such as driving voltage, component characteristics, and coil specifications before performing this method. If the above-mentioned default parameters are changed during use, it will need to be reset, which makes the design of this method inflexible. It is difficult to correctly judge whether there is abnormal metal

In addition, this method still needs to install a current detection circuit at the power supply end and the power receiving end to calculate the value of current and voltage to measure the power change of the power supply end and the power receiving end, but the above current detection circuit may not be able to accurately measure Measure the actual power consumption changes, and the power changes at the receiving end also need to be transmitted to the power supply end through wireless signal transmission for calculation. Whether the signal transmission can be completed synchronously for subsequent calculations may also cause errors and cannot be accurately judged Whether there are metal foreign objects

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