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EMC EMI Filter

Single Phase EMI Filter

3 Phase EMI Filter

Ferrite Rings Around Cables

DC EMI Filters

AC EMI Filter

IEC EMI Filter

Military EMI Filters

Inverter EMI Filter

PCB Low Pass Filter

EMI Suppression Filter

Clip On Ferrite Core

Snap On Ferrite Choke

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Flat Ferrite Core
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Company Cases about EMC Rectification for Automatic Hair Curler Using VIIP Ferrite Solutions

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Miss. Vicky Lee
vip6@szviip.com
86-0755-29170376
wechat 19925448748
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EMC Rectification for Automatic Hair Curler Using VIIP Ferrite Solutions

2026-11-07

EMC Rectification for Automatic Hair Curler Using VIIP Ferrite Solutions 1. Background & Challenges

During the conducted and radiated emission testing of an automatic hair curler, high-frequency electromagnetic interference (EMI) generated by the internal high-speed DC drive motor and switching power circuitry led to standard limit exceedance, failing compliance requirements (EN 55014 / CISPR 14 / FCC Part 15).

2. VIIP Targeted Engineering Solution

To achieve swift compliance without redesigning the PCB layout or altering the compact housing structure, VIIP engineers implemented a dual-point suppression strategy using high-permeability, wideband ferrite components:

Motor Drive Noise Suppression — VIIP V18059T Toroidal Ferrite Core:

Installed directly at the motor lead terminals with a 1-turn winding (2 passes). The V18059T provides targeted high impedance in the critical switching noise band, absorbing high-frequency differential/common-mode noise at the source before it couples into the internal wiring harness.

Power Input Line Decoupling — VIIP V18080H Cylindrical Ferrite Bead:

Positioned on the main power supply wiring in a straight-through configuration. The V18080H effectively blocks conducted noise from escaping along the AC power cord, significantly enhancing high-frequency attenuation and cable immunity.

3. Test Results & Key Benefits
  • Full Spectrum Compliance: Critical quasi-peak and average reading points across all frequency ranges achieved a stable pass margin of over 5 dB against standard limits.
  • Zero PCB Redesign: Fast, cost-effective snap/sleeve assembly with minimal footprint, perfectly suited for space-constrained personal care appliances.
  • Reliable Mass Production: Optimized thermal and mechanical stability ensuring consistent filtering performance under continuous high-temperature operating conditions.
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