Wireless Charging Coils: Technical Breakdown by Goden Eagle

Wireless Charging Coils: Technical Breakdown by Goden Eagle

1. By Winding Structure

▸ Flat Spiral Coils

• Structure: Single/multi-layer planar design

• Key Specs: 5-20μH inductance, 0.1-1.0mm wire diameter

• Best For: Qi-standard devices (smartphones, wearables)

• Advantage: Ultra-thin profile (<0.8mm) for compact designs

▸ Litz Wire Coils

• Structure: Multi-strand twisted wire (typically 60-200 strands)

• Key Specs: 10-30μH, AC resistance <50mΩ @100kHz

• Best For: High-power 15W+ applications (tablets, tools)

• Advantage: Reduced skin effect losses at 110-205kHz

▸ Multi-Coil Arrays

• Structure: 3-18 coil matrix with overlapping zones

• Key Specs: 5-15μH per subunit, ±5% positional tolerance

• Best For: Free-position charging (e.g., furniture-embedded systems)

• Advantage: 75%+ spatial efficiency vs single-coil designs

2. By Core Material

3. Cutting-Edge Innovations

▶ Graphene-Enhanced Coils

• 18% lower Rdc than copper at 25°C

• 100W+ capability with <3°C temperature rise

▶ Hybrid DD+Tape Coils

• Dual-mode for both Qi and MagSafe compatibility

• 85% alignment tolerance improvement

Technical Insight: Our 16-coil matrix module achieved 92% efficiency at 65mm Z-axis distance (vs industry avg. 78%) in automotive center console prototypes.

Golden Eagle's Customization Capabilities:
✓ Impedance Matching: Optimized for 6.78MHz/13.56MHz systems
✓ Shielding Solutions: Reduce EMI by 15dB (meets CISPR-32 Class B)
✓ Automotive Grade: AEC-Q200 compliant coils for 85°C ambient operation