Hero Section: The Solution

Headline:

Custom Common Mode Chokes: Robust EMI Suppression for Power Lines

Sub-headline:

Engineered to block electromagnetic interference in high-power circuits. As a specialized Custom Inductor Manufacturer, we deliver Common Mode Chokes featuring high-permeability cores and heavy-gauge winding to handle high currents while maintaining superior impedance across a wide frequency range.

Key Highlights:

High Current Handling: Designed with thick copper wire (e.g., 1.3mm) to support heavy loads in industrial and renewable energy systems.

Broad-Band Filtering: Effectively suppresses common-mode noise from 10kHz to 30MHz, essential for EMI Filter compliance.

Robust Isolation: Partitioned winding structure ensures excellent high-voltage isolation between lines, meeting strict safety standards.

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Reference Case Study: Model LFR5020-501N

Note: The specifications below are from our production model LFR5020-501N. This demonstrates our manufacturing capability for High Power Common Mode Chokes.

Parameter	Specification (Reference Only)	Customization Range
Model P/N	LFR5020-501N	Custom P/N assignment available
Category	Common Mode Choke	AC Line Filter / Power Choke
Dimensions	50.0 x 20.0 x 30.0 mm	Custom sizes (e.g., UU9.8 - UU16)
Inductance (L)	500 µH Min (@1kHz)	100µH - 50mH (Optimized for Impedance)
DCR (Resistance)	10 mΩ Max	Minimized for efficiency
Wire Specs	1.3mm UEW (Thick Wire)	Flat Wire / Litz Wire / TIW
Turns	14 Turns (Ref)	Custom turn count
Core Material	Ferrite / Nanocrystalline	Mn-Zn / Nanocrystalline

Engineer's Insight: The LFR5020 is a powerhouse filter. Unlike standard compact chokes, it utilizes a large 50mm frame and 1.3mm thick wire to achieve an ultra-low DCR of 10mΩ while providing 500uH of filtering inductance. This makes it ideal for the AC input stage of high-power inverters.

Tailor This Choke to Your Needs

We customize the core and winding to target specific noise frequencies.

Core Material: The Key to Filtering

● Nanocrystalline Cores: For the highest performance in compact sizes. They offer 5-10x the permeability of ferrite, allowing for fewer turns (lower copper loss) to achieve the same impedance. Perfect for High Current Common Mode Chokes.

● Mn-Zn Ferrite: The cost-effective standard for low-frequency noise suppression (100kHz - 1MHz).

● Ni-Zn Ferrite: Best suited for suppressing high-frequency interference (>10MHz).

Structural & Safety Customization

● Winding Topology: We offer Sectional Winding (to reduce stray capacitance and improve high-frequency performance) or Bifilar Winding (for maximum coupling coefficient).

● Isolation: Options for Triple Insulated Wire (TIW) or increased creepage distances to meet 3000Vac+ Hi-Pot requirements for medical or industrial safety.

Industries We Serve

Typical applications for our Common Mode Chokes.

Renewable Energy:

AC output filtering in Solar Inverters and Wind Converters.

Industrial Drives:

Input line filters for VFDs (Variable Frequency Drives) to protect the grid.

EV Charging:

High-power EMI suppression in on-board chargers and charging piles

Power Supplies:

Standard AC-DC switch-mode power supply (SMPS) input stages.

Quality Assurance & Testing

Strict verification for safety and EMC compliance.

Impedance Check: Inductance verified to ensure minimum impedance at operating frequency.
Hi-Pot Testing: 100% dielectric strength testing (Line-to-Line / Line-to-Core) to ensure safety isolation.
DCR Measurement: Resistance verified to prevent overheating under load (< 10mΩ for LFR5020).
Visual Inspection: Check for core cracks and secure wire termination.