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موارد شرکت در باره EMC Rectification for Automatic Hair Curler Using VIIP Ferrite Solutions

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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.