Investigating human exposure to a practical wireless power transfer system using and the effect about key parameters of dosimetry

PloS one · 2020 · Unclear · Low evidence

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UnclearLow evidencePaper 1382

Study snapshot

PublicationPloS one · 2020

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingLow

Abstract

Investigating human exposure to a practical wireless power transfer system using and the effect about key parameters of dosimetry SangWook Park. Investigating human exposure to a practical wireless power transfer system using and the effect about key parameters of dosimetry. PLoS One. 2020 Aug 14;15(8):e0236929. doi: 10.1371/journal.pone.0236929. Abstract 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. 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. However, both circuit and electromagnetic simulations need to be performed to analyze the entire system, which is a difficult task. In order to overcome this difficulty, a method using an equivalent circuit model is proposed and verified through experiments. 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. Accordingly, the strongest magnetic field was created in the constant current mode in the fully charged state with misalignment. 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. 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. pubmed.ncbi.nlm.nih.gov

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment

Effect directionunclear

PopulationJapanese adult male whole-body voxel human model

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

An equivalent circuit model method was proposed and verified through experiments to support dosimetry for a practical WPT system. The strongest magnetic field occurred in constant current mode, fully charged state, with coil misalignment; at 10 mm from the transmission pad, magnetic field strength at 80% state of charge with misalignment was 1.397 times greater than at 20% state of charge with alignment. Induced electric fields and current densities were calculated using a Japanese adult male voxel model and compared with international guideline recommended values to assess compliance.

Outcomes measured

Magnetic field strength under different WPT operating/geometry conditions
Induced electric fields
Induced current densities
Compliance comparison with international guideline recommended values

Limitations

Frequency of the WPT system not stated in the provided abstract/metadata
No quantitative induced field/current density values reported in the provided abstract
Human exposure assessment based on a single voxel model (Japanese adult male) rather than measured human data (as described)

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": null,
    "source": "wireless power transfer (WPT) system",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Japanese adult male whole-body voxel human model",
  "sample_size": null,
  "outcomes": [
    "Magnetic field strength under different WPT operating/geometry conditions",
    "Induced electric fields",
    "Induced current densities",
    "Compliance comparison with international guideline recommended values"
  ],
  "main_findings": "An equivalent circuit model method was proposed and verified through experiments to support dosimetry for a practical WPT system. The strongest magnetic field occurred in constant current mode, fully charged state, with coil misalignment; at 10 mm from the transmission pad, magnetic field strength at 80% state of charge with misalignment was 1.397 times greater than at 20% state of charge with alignment. Induced electric fields and current densities were calculated using a Japanese adult male voxel model and compared with international guideline recommended values to assess compliance.",
  "effect_direction": "unclear",
  "limitations": [
    "Frequency of the WPT system not stated in the provided abstract/metadata",
    "No quantitative induced field/current density values reported in the provided abstract",
    "Human exposure assessment based on a single voxel model (Japanese adult male) rather than measured human data (as described)"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "wireless power transfer",
    "WPT",
    "dosimetry",
    "equivalent circuit model",
    "magnetic field",
    "electromagnetic resonance",
    "electromagnetic induction",
    "coil misalignment",
    "induced electric field",
    "current density",
    "exposure assessment",
    "international guidelines"
  ],
  "suggested_hubs": [
    {
      "slug": "engineering",
      "weight": 0.78,
      "reason": "Proposes and experimentally verifies an equivalent circuit modeling method for WPT dosimetry and evaluates key system parameters affecting fields."
    },
    {
      "slug": "exposure-assessment",
      "weight": 0.72,
      "reason": "Assesses worst-case magnetic field conditions and computes induced electric fields/current densities in a voxel human model for guideline comparison."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1371/journal.pone.0236929
PubMed: 32797050

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