Otherwise, dosimetry could be carried out under an abnormal condition that fails to reflect a real system.
#Battery magnet blocks wireless charging verification
In this regard, it is very important to perform experimental verification or to present information about the port condition. Thus, a simulation needs to be adapted to the source and load conditions that vary according to the SoC. However, the current depends on the terminal condition, the state of charge (SoC), and so on (details will be presented in Section II-A).
This condition is met only by accurately describing the current flowing in a WPT coil. This numerical dosimetry can be performed successfully under the condition that the electromagnetic field to which a human body will be exposed is accurately simulated. As the induced quantities in a human body are difficult to measure in such a frequency band, they have been calculated by a numerical analysis using a human body model. Thus, an investigation should focus on the use of the operating frequency band below dozens of megahertz for a WPT system. WPT systems using electromagnetic induction and resonance are one of the most actively studied subjects, and the operating frequency of these systems is in the range of frequency bands on the order of hundreds of kilohertz or several megahertz. The risk assessment for a human body exposed to a WPT system requires the calculation of the induced quantities in the human body, and compliance of the result with chosen international guidelines is to be checked. Guidelines for human protection from electromagnetic field exposure are provided by either the International Commission on Non-Ionizing Radiation Protection (ICNIRP) or IEEE safety standard. will be accompanied by high-power transfer, the electromagnetic effects on the human body should be carefully examined. In particular, as the application of this technology to electric vehicles, trains, etc. This problem is one of the last hurdles for electromagnetic compatibility and standards for commercialization. Thus, people are more concerned about and interested in human exposure to electromagnetic radiation. WPT emits more electromagnetic energy than wireless communication.
Some technical issues such as the physical understanding of WPT, design theory, matching techniques for achieving a high-power transfer efficiency, and the improvement in the power transfer distance, have almost all been resolved. Many studies have been focused on the application of WPT technology to various fields. Finally, the induced electric fields and induced current densities were calculated by using a Japanese adult male whole-body voxel human model, and the results were compared with the values recommended by international guidelines to ascertain their compliance. For example, the magnetic field strength in the case of 80% state of charge and misalignment was 1.397 times greater than in the case of 20% state of charge and alignment at a point 10 mm from the transmission pad. Accordingly, the strongest magnetic field was created in the constant current mode in the fully charged state with misalignment. Moreover, the worst exposure condition to a magnetic field was examined by considering three variables: the charging mode, the state of charge, and the alignment and misalignment between the transmitting and receiving coils. In order to overcome this difficulty, a method using an equivalent circuit model is proposed and verified through experiments. However, both circuit and electromagnetic simulations need to be performed to analyze the entire system, which is a difficult task. In particular, the electromagnetic field depends on factors such as the construction of the transmitting and receiving coils, the circuit configuration, the input source of the front end of the transmitting coil, and the input impedance of the rear end of receiving coil. Accurate dosimetry for a real wireless power transfer system (WPT) using electromagnetic resonance and electromagnetic induction requires an accurate description of the field formed by the system.
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