Nanocrystalline EMI Filter Cores
High-performance nanocrystalline transformer cores for EMI filters and CTs. Superior EMI suppression for switch-mode power supplies, motor drives, and power electronics applications.
EMI Filter Applications
- • Switch Mode Power Supplies
- • Motor Drive Inverters
- • Solar Inverters
- • LED Drivers
Why Nanocrystalline for EMI Filters?
Nanocrystalline cores provide superior EMI suppression performance compared to ferrite cores, especially for nanocrystalline common mode choke cores and EMC filter cores in high-frequency switching applications.
Superior EMI Suppression
High impedance at EMI frequencies (10kHz-1MHz) provides excellent common-mode noise suppression in power electronics applications.
High Saturation
Higher saturation flux density (1.2T) prevents core saturation under high differential currents, maintaining EMI filter effectiveness.
Temperature Stability
Stable impedance characteristics from -40°C to +130°C ensure consistent EMI performance across automotive and industrial temperature ranges.
EMI Filter Core Requirements & Solutions
EMI filter applications require cores with high common-mode impedance to suppress electromagnetic interference while maintaining low differential-mode impedance for normal operation. Key requirements include high permeability for effective noise suppression, thermal stability for continuous operation, and saturation resistance under fault conditions.
Nanocrystalline materials excel in EMI suppression cores applications due to their superior permeability (15,000-80,000), higher saturation flux density (1.2T) preventing core saturation, and excellent temperature stability. These properties enable more effective EMI suppression compared to traditional ferrite cores for EMC filters.
EMC Compliance: Our nanocrystalline EMI filter cores help achieve EMC compliance with international standards including CISPR 32 for multimedia equipment, EN 55032 for electromagnetic compatibility, and FCC Part 15 for radio frequency devices. These EMC filters are essential for meeting regulatory requirements in power electronics applications.
CenturaCores offers nanocrystalline EMI filter cores in toroidal and custom geometries optimized for common-mode chokes in SMPS, motor drives, and power converters. Our cores meet EMC standards with customization options for specific impedance requirements and regional stock availability.
Technical Specifications for EMI Filter Cores
Our nanocrystalline EMI filter cores are optimized for common-mode choke applications in power electronics, providing superior EMI suppression performance.
| Parameter | Value |
|---|---|
| Frequency Range | 10kHz - 1MHz |
| Permeability | 15,000 - 80,000 |
| Saturation Flux Density | 1.2 T |
| Operating Temperature | -40°C to +130°C |
| Core Loss (100kHz) | <200 mW/cm³ |
| Impedance Stability | ±5% (20°C to 100°C) |
EMC Standards
- • CISPR 32 (Multimedia Equipment)
- • IEC 61000-6-3 (Generic Emission)
- • FCC Part 15 (Radio Frequency Devices)
- • EN 55032 (Electromagnetic Compatibility)
EMI Filter Applications
Common-Mode Choke Design
Design Considerations:
- • High common-mode impedance (>1kΩ at 100kHz)
- • Low differential-mode impedance (<10Ω)
- • Balanced winding for optimal performance
- • Minimal leakage inductance
Advantages over Ferrite:
- • Higher saturation prevents core saturation
- • Better temperature stability
- • Lower core losses at high frequencies
- • Smaller core size for same performance
Frequently Asked Questions
Why choose nanocrystalline over ferrite for common-mode chokes?
Nanocrystalline common mode choke cores offer superior performance with higher saturation flux density (1.2T vs 0.4T for ferrite), better temperature stability, and higher permeability. This results in smaller core sizes, better EMI suppression, and more reliable performance in high-power applications like motor drives and SMPS.
What frequency range do your EMI filter cores cover?
Our nanocrystalline EMI suppression cores are optimized for the 10 kHz–1 MHz frequency range, which covers the critical EMI frequencies for most power electronics applications. This range is ideal for common-mode chokes in SMPS, motor drives, and other switching power applications.
How do nanocrystalline EMC filter cores help with compliance?
Our EMC filter cores help meet international standards like CISPR 32, EN 55032, and FCC Part 15 by providing superior common-mode noise suppression. The high impedance characteristics effectively filter EMI, ensuring your products pass EMC compliance testing.
Design Custom EMI Filter Cores
Our engineering team can help design nanocrystalline cores for your specific EMI filter and common-mode choke requirements.