Safety assessment of wireless chargers for electric vehicles considering thermal characteristics
Abstract
Safety assessment of wireless chargers for electric vehicles considering thermal characteristics Mou W, Lu M. Safety assessment of wireless chargers for electric vehicles considering thermal characteristics. Radiat Prot Dosimetry. 2023. doi: 10.1093/rpd/ncad288. Abstract This study employs the transient finite element method and electromagnetic heat transfer theory to assess the heating generated by high-power wireless chargers during electric vehicle charging. The analysis includes simulating and analyzing the temperature distribution of two different types of shielding plates of the wireless charger and the specific absorption rate (SAR) and head temperature rise of both adults and children in close proximity to the charger. Simulation results show that the maximum temperature rise of the copper shielding plate is 16°C lower than that of the aluminum shielding plate after charging for 1 h. This temperature increase does not affect the chassis’ s equipment. Regarding human safety, the induced electric field strength and SAR values in the child’s head tissue are higher than those in the adult, meeting the International Commission on Non-Ionizing Radiation Protection (ICNIRP) limits. When the initial temperature is set to 37°C, the temperature rise in the heads of both adults and children is approximately equal after 1 h of charging, reaching a maximum temperature rise of 0.21 and 0.23°C, respectively. These values remain below the thermal limit of ICNIRP (2°C for Type 2 tissues). The findings indicate that the copper shielding plate can provide both electromagnetic shielding and heat dissipation functions, and the electromagnetic exposure absorbed by the human body and head temperature rise within safe ranges. academic.oup.com
AI evidence extraction
Main findings
Using transient finite element simulations, the maximum temperature rise of a copper shielding plate was 16°C lower than an aluminum shielding plate after 1 h of charging. Simulated induced electric field strength and SAR in a child’s head were higher than in an adult but were reported to meet ICNIRP limits; simulated maximum head temperature rises after 1 h were 0.21°C (adult) and 0.23°C (child), below the ICNIRP thermal limit for Type 2 tissues (2°C).
Outcomes measured
- Temperature distribution of shielding plates (copper vs aluminum)
- Specific absorption rate (SAR)
- Induced electric field strength
- Head temperature rise (adults and children)
- Compliance with ICNIRP limits
Limitations
- Simulation/modeling study (finite element and electromagnetic heat transfer theory) rather than measurements in humans
- Key exposure parameters (e.g., operating frequency, power, distance) not specified in the abstract
- Sample size and anatomical model details not provided in the abstract
Suggested hubs
-
who-icnirp
(0.9) Assesses SAR and thermal effects against ICNIRP limits.
-
occupational-exposure
(0.25) Considers proximity exposure to a high-power wireless charger; context could be relevant to workers/near-field scenarios, though not explicitly occupational in the abstract.
View raw extracted JSON
{
"study_type": "engineering",
"exposure": {
"band": null,
"source": "wireless charger for electric vehicles",
"frequency_mhz": null,
"sar_wkg": null,
"duration": "1 h"
},
"population": "Adults and children in close proximity to an electric vehicle high-power wireless charger (simulated)",
"sample_size": null,
"outcomes": [
"Temperature distribution of shielding plates (copper vs aluminum)",
"Specific absorption rate (SAR)",
"Induced electric field strength",
"Head temperature rise (adults and children)",
"Compliance with ICNIRP limits"
],
"main_findings": "Using transient finite element simulations, the maximum temperature rise of a copper shielding plate was 16°C lower than an aluminum shielding plate after 1 h of charging. Simulated induced electric field strength and SAR in a child’s head were higher than in an adult but were reported to meet ICNIRP limits; simulated maximum head temperature rises after 1 h were 0.21°C (adult) and 0.23°C (child), below the ICNIRP thermal limit for Type 2 tissues (2°C).",
"effect_direction": "no_effect",
"limitations": [
"Simulation/modeling study (finite element and electromagnetic heat transfer theory) rather than measurements in humans",
"Key exposure parameters (e.g., operating frequency, power, distance) not specified in the abstract",
"Sample size and anatomical model details not provided in the abstract"
],
"evidence_strength": "low",
"confidence": 0.7399999999999999911182158029987476766109466552734375,
"peer_reviewed_likely": "yes",
"keywords": [
"wireless charging",
"electric vehicles",
"finite element method",
"electromagnetic heat transfer",
"shielding plate",
"copper",
"aluminum",
"SAR",
"induced electric field",
"head temperature rise",
"ICNIRP compliance"
],
"suggested_hubs": [
{
"slug": "who-icnirp",
"weight": 0.90000000000000002220446049250313080847263336181640625,
"reason": "Assesses SAR and thermal effects against ICNIRP limits."
},
{
"slug": "occupational-exposure",
"weight": 0.25,
"reason": "Considers proximity exposure to a high-power wireless charger; context could be relevant to workers/near-field scenarios, though not explicitly occupational in the abstract."
}
]
}
AI can be wrong. Always verify against the paper.
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