Editorial Technical Reference

Automotive Wireless Power Transfer System

This page explains how Automotive Wireless Power Transfer System is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The Automotive Wireless Power Transfer System is an integrated solution for contactless charging of electric vehicles.

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Product Specifications

Technical details and manufacturing context for Automotive Wireless Power Transfer System

Definition
The Automotive Wireless Power Transfer System is an integrated solution for contactless charging of electric vehicles. It transfers power between a ground-based charging pad and a vehicle-mounted receiver through electromagnetic induction, eliminating the need for physical connectors and cables. This system is designed for residential, commercial, and public charging applications, offering convenience and reduced wear on charging components. It incorporates safety features, communication protocols, and alignment assistance to ensure efficient and reliable power transfer. The system is built to meet automotive-grade durability and environmental standards for outdoor use, with an ingress protection rating of IP65–IP67 and an operating temperature range of -40°C to 85°C. Key parameters include a charging power of 3.3–11 kW, an operating frequency of 85 kHz (per SAE J2954), and a system efficiency of 85–93% at nominal air gap. The maximum air gap is 100–250 mm, and the input voltage range is 380–480 V AC (per IEC 61851). Communication between the vehicle and charger follows ISO 15118. The system includes a ground assembly and a vehicle pad, with a total weight of 15–30 kg. Coil sizes range from 600×600 mm to 800×800 mm, and liquid cooling is required for high power levels. The output voltage is 200–500 V DC, with a maximum output current of 25–50 A. Materials used include ferrite cores, copper litz wire, aluminum housing, polycarbonate cover, and power electronics PCBs. This directory entry provides reference values; actual model-specific parameters and standards compliance must be verified with the legal manufacturer or supplier.
Working Principle
The system operates on the principle of electromagnetic induction. An alternating current flows through a transmitting coil embedded in the ground pad, generating an alternating magnetic field. This field induces an alternating current in the receiving coil mounted on the vehicle, which is then rectified to charge the battery. The coils are tuned to resonate at 85 kHz to enhance power transfer efficiency. The air gap between the coils is typically 100–250 mm, and the system maintains efficiency through alignment assistance and communication between the vehicle and charger. Safety features monitor temperature, foreign objects, and coil alignment to ensure safe operation.
Common Materials
ferrite core, copper litz wire, aluminum housing, polycarbonate cover, power electronics PCB
Technical Parameters
ParameterTypical rangeNotes & selection driver
Charging PowerRequired3.3–11 kWMaximum power output
Operating FrequencyRequired85 kHzResonant frequencySAE J2954
System EfficiencyRequired85–93 %AC-AC efficiency at nominal gap
Maximum Air GapRequired100–250 mmMaximum effective charging distance
Input VoltageRequired380–480 VAC input voltage rangeIEC 61851
Communication ProtocolRequiredISO 15118Vehicle-to-charger communicationISO 15118
IP RatingRequiredIP65–IP67Ingress protection ratingIEC 60529
Operating TemperatureRequired-40–85 °CAmbient temperature rangeIEC 60068-2-1/2
Output Voltage200–500 V DCMatches vehicle battery voltage.
Maximum Output Current25–50 ADetermines charging speed.
Coil Size600×600–800×800 mmLarger coil improves tolerance to misalignment.
Weight15–30 kgIncludes ground assembly and vehicle pad.
Cooling MethodLiquidLiquid cooling required for high power levels.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Automotive Wireless Power Transfer System.

EV wireless charger wireless EV charging contactless vehicle charger

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (non-pressurized)
other spec: Alignment tolerance: ±75mm lateral, ±50mm vertical; Power transfer efficiency: 85-94%
temperature: -40°C to +85°C
Media Compatibility
✓ Concrete/asphalt parking surfaces ✓ Polymer-based protective coatings ✓ Standard automotive underbody materials
Unsuitable: High-moisture or submerged environments (e.g., flood zones, constant water exposure)
Sizing Data Required
  • Vehicle battery capacity (kWh)
  • Required charging power (kW)
  • Ground clearance and underbody geometry

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Coil Overheating and Insulation Degradation
Cause: Excessive current due to misalignment or foreign object interference leading to thermal runaway, compounded by environmental factors like moisture ingress causing insulation breakdown.
Power Electronics Component Failure
Cause: Thermal cycling stress on semiconductors (e.g., MOSFETs, IGBTs) and capacitors, exacerbated by voltage spikes from switching transients and poor thermal management design.
Maintenance Indicators
  • Audible high-pitched whining or buzzing from the charging pad, indicating resonant frequency shift or component stress
  • Visible discoloration, bubbling, or charring on the charging pad surface or housing, suggesting overheating
Engineering Tips
  • Implement predictive maintenance using thermal imaging and vibration analysis to detect early-stage coil degradation and power electronics faults before catastrophic failure
  • Design and enforce strict alignment protocols and foreign object detection systems, coupled with environmental sealing to prevent moisture and debris ingress

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 19363:2020 - Electrically propelled road vehicles - Magnetic field wireless power transfer - Safety and interoperability requirements ANSI/UL 2750 - Standard for Wireless Power Transfer Equipment DIN EN 61980-1:2021 - Electric vehicle wireless power transfer (WPT) systems - Part 1: General requirements

Quoted from the published standard.

Manufacturing Precision
  • Coil Alignment: +/- 3 mm
  • Air Gap Variation: +/- 5 mm
Quality Inspection
  • Electromagnetic Compatibility (EMC) Testing
  • Thermal Cycling and Overload Testing

Manufacturers of Automotive Wireless Power Transfer System

Manufacturer profiles associated with Automotive Wireless Power Transfer System.

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Supply Chain Commonly Integrated Components

Modular Tooling Fixtures

Interchangeable, standardized fixtures used to precisely position and secure chassis components during assembly operations.

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Automated Material Handling System

Automated system for transporting, positioning, and feeding materials within a vehicle body assembly line

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Assembly Fixture

Specialized tooling device used to precisely position and secure vehicle components during assembly operations.

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Isolated Power Supply

A power supply unit that provides electrical isolation between input and output circuits within a Battery Control Unit (BCU).

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Frequently Asked Questions

What is the maximum charging power of this system?

The reference range for maximum power output is 3.3–11 kW, depending on the specific model and configuration. Actual power ratings must be confirmed with the manufacturer.

What standards does the system reference?

The system references SAE J2954 for operating frequency (85 kHz), IEC 61851 for input voltage, ISO 15118 for communication, and IEC 60529 for ingress protection. Compliance with these standards should be verified with the supplier.

What is the typical air gap for charging?

The maximum effective charging distance is 100–250 mm. The actual air gap depends on the vehicle and pad installation, and alignment is assisted by the system.

Is liquid cooling required?

Yes, the cooling method is liquid, which is required for high power levels to manage heat dissipation. The system includes provisions for liquid cooling.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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