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Company Cases about How to use VIP1‑1A‑06 EMI filter for switching power supply EMC compliance solution

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Miss. Vicky Lee
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How to use VIP1‑1A‑06 EMI filter for switching power supply EMC compliance solution

2026-08-14

Switching Power Supply Passes EMC Testing with VIIP VIP1‑1A‑06 Filter

Client: Manufacturer of industrial switching power supply

EMC Challenges

  • Failed Class B conducted emissions (peaks at 30MHz‑120MHz)
  • Susceptibility to grid surge interference, causing power output fluctuation
  • Required compliance with cULus, CE‑EMC, RoHS & REACH for industrial export

Solution: Integrated VIP1‑1A‑06 IEC inlet EMI Filter

Key Specifications Applied (per VIIP spec sheet Rev4.1):

  1. Input Protection:

  • Installed VIIP VIP1‑1A‑06 IEC inlet filter, Model Code: B011X0477

    ‑6A RMS Max @ 115/250VAC for switching power supply main load

    ‑36dB common‑mode attenuation @1MHz, suppress switching frequency harmonics effectively

    ‑2000VAC line‑to-ground Hi-pot rating (1min), 1450VDC line-to-line, meets IEC 60950‑1 industrial safety requirements

    ‑Max leakage current: 0.3mA@115VAC/60Hz; 0.6mA@250VAC/50Hz

    ‑Operating temperature range: -25°C ~ +100°C

  1. Enhanced Design:

  • ‑Combined with ferrite cores on DC output cables to boost high-frequency noise suppression

    ‑Optimized filter low-impedance grounding connection to power supply metal chassis

Test Results

Parameter Pre‑Modification Post‑Modification (VIP1‑1A‑06) Standard
Conducted Emission @30MHz Exceed limit 22dB below limit EN55032 Class B
Surge Immunity Output unstable Pass 2kV surge test IEC 61000‑4‑5
Line-to-Ground Hi-pot Test N/A Pass 2000VAC / 1min IEC 60950‑1
Line-to-Line Hi-pot Test N/A Pass 1450VDC / 1min IEC 60950‑1

Summary

After integrating VIIP VIP1‑1A‑06 IEC inlet filter (Part No.B011X0477), this industrial switching power supply fully passed cULus, CE‑EMC, RoHS and REACH tests. Grid-side surge noise and switching harmonic interference were well suppressed by the filter’s high CM/DM insertion loss. Stable power output performance was achieved for mass export to EU & North America.

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