Wireless power transfer (WPT) has become a mainstream power solution for consumer wearables, smart home devices and compact portable electronics. At the heart of reliable, cool‑running wireless charging lies a well‑engineered transmitting or receiving coil. Today we take a closer look at our G20 Wireless Charging Coil, a compact component built with 10.4uH inductance, 20mm outer diameter and nano‑crystalline litz wire, designed to fix common pain points: excessive heat, low conversion efficiency, resonance drift and short service life.

Consistent inductance and tight dimensional tolerance are critical for stable wireless charging performance. The G20 coil is calibrated for the popular 85kHz‑205kHz Qi working frequency band.

10.4uH nominal inductance: This inductance value delivers ideal resonance matching for small‑power wireless charging transmitter ICs and receiver modules. It cuts reactive power waste, prevents charging stuttering and intermittent connection caused by inductance deviation.

20mm outer diameter: The compact footprint balances effective charging area and miniaturization. It fits inside slim enclosures for TWS earbuds, smart watches, mini charging pads and tiny smart sensors, supporting modern lightweight product design.

Many low‑cost coils use solid copper or simple stranded wire. Under WPT high‑frequency operation, skin effect and proximity effect raise AC resistance, generate extra heat and drag down overall efficiency.

Our G20 uses high‑grade litz wire made of multiple fine insulated copper strands twisted together. The multi‑strand structure disperses high‑frequency current, greatly suppressing skin & proximity losses. Compared with conventional copper coils, it achieves 15%‑25% lower high‑frequency loss and keeps lower working temperature during continuous charging.

Paired with nano‑crystalline magnetic material, the coil features high permeability and low magnetic loss. It shapes and concentrates magnetic flux within the target charging zone, reduces magnetic leakage and lifts power transfer efficiency. The material also brings good mechanical stability, insulation and vibration resistance for mass‑production assembly.

• High efficiency & low heat build‑up
  Thanks to litz‑wire loss reduction and nano‑crystalline magnetic optimization, the G20 maintains low impedance at working frequency. It runs steadily for long‑hour charging without overheating, improves system‑level energy efficiency and reduces device power consumption.

• Accurate resonance & broad compatibility
  Strict winding control keeps 10.4uH inductance within tight tolerance. The coil matches Qi‑compliant modules, consumer charging hardware and small‑scale industrial WPT systems for easy integration.

• Small form factor & commercial‑grade durability
  20‑mm size saves valuable internal PCB space for ultra‑thin product designs. Litz wire offers good flexibility; uniform tight winding resists loosening and deformation during assembly. It withstands vibration and long‑term operation for volume manufacturing.

• Wearable electronics: smart watches, TWS earbuds, fitness bracelets
• Consumer gadgets: mini wireless charging pads, portable power banks, Bluetooth speakers
• Smart home: miniature sensors, wireless‑charge remote controls
• Compact industrial hardware: low‑power wireless power supply modules, portable inspection devices

Many coil suppliers struggle with batch‑to‑batch inconsistency. Our G20 delivers three key strengths for product developers:

• Precise parameter control: 10.4uH inductance and 20mm dimension hold tight tolerances, ensuring uniform performance across large‑volume orders.
• Premium material stack: Nano‑crystalline litz wire is adopted instead of ordinary copper to mitigate high‑frequency heating and efficiency drop.
• Manufacturer supply: We offer standard stock, sample support and custom modification. You get factory‑direct pricing for your OEM project.