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Ferrite Core & EMI Suppression
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Huzhou Careful Magnetism & Electron Group – Trusted manufacturer and supplier of high-performance ferrite beads, toroids, amorphous cores, and magnetic components for industrial, automotive, and power electronics.

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About Careful Magnetism

Huzhou Careful Magnetism & Electron Group is a leading manufacturer and supplier specializing in advanced magnetic components. With years of expertise in material science and electromagnetic design, we deliver reliable, high-efficiency solutions for power conversion, signal integrity, and EMI suppression.

Our product range includes ferrite cores, toroids, amorphous and nanocrystalline cores, inductors, and custom magnetic assemblies used across industries such as renewable energy, electric vehicles, telecommunications, and industrial automation.

15+

Years Experience

50+

Global Clients

Factory or Core Production

Our Product Series

Comprehensive range of magnetic components engineered for performance, durability, and efficiency.

Amorphous Core

Ferrite Core

MnZn Transformer

Inductor Coils

Our Products

Amorphous Core

Amorphous Core

High saturation flux density, low core loss for high-frequency power applications.

  • Material: Fe-based amorphous alloy
  • Frequency Range: 20 kHz – 100 kHz
  • Applications: SMPS, Inverters
Toroid Nanocrystalline Core

Toroid Nanocrystalline Core

Ultra-low coercivity and high permeability for precision current sensing.

  • Material: Fe-Cu-Nb-Si-B
  • Permeability: Up to 100,000
  • Applications: CTs, EMI Filters
EMI Suppression Ferrite Core

EMI Suppression Ferrite Core

Effective noise suppression in power and signal lines.

  • Material: MnZn / NiZn
  • Impedance: 60Ω – 600Ω @ 100MHz
  • Applications: USB, Power Cables
Toroidal Ferrite Core

Toroidal Ferrite Core

Closed magnetic path design for minimal leakage flux.

  • Shapes: Ring, Donut, Torus
  • Material: MnZn High-μ
  • Inductance: Customizable
C Core

C Core

Split design for easy winding and assembly in transformers.

  • Material: Grain-Oriented Silicon Steel
  • Power Rating: Up to 10kVA
  • Applications: Power Transformers
Split Core

Split Core

Ideal for retrofitting and current sensing without disassembly.

  • Material: MnZn Ferrite
  • Aperture: Standard & Custom
  • Applications: Clamp Meters, Sensors
Rod Core

Rod Core

Simple structure for low-cost EMI filtering and antenna applications.

  • Lengths: 10mm – 100mm
  • Diameter: 3mm – 10mm
  • Material: NiZn High-Freq
MnZn Transformer Core

MnZn Transformer Core

High permeability and low losses for power conversion systems.

  • Shapes: E, EC, PQ, RM, EP
  • μi: 2000 – 15000
  • Applications: AC/DC, DC/DC

Core Materials

Am

Amorphous Series

Ultra-low core loss, high saturation, ideal for high-efficiency power systems.

  • Fe-Based Alloys
  • Used in High-Frequency Transformers
  • Energy Efficient
MnZn

MnZn Series

High permeability and low losses for power and signal applications.

  • Frequency: 1kHz – 1MHz
  • Used in Power Supplies
  • Excellent Temp Stability
NiZn

NiZn Series

High resistivity for high-frequency EMI suppression and RF applications.

  • Frequency: 1MHz – 1GHz
  • Used in RF Chokes
  • Low Signal Distortion

Applications & Use Cases

Power Electronics

Our MnZn and amorphous cores are widely used in switch-mode power supplies (SMPS), inverters, and DC-DC converters for efficient energy transfer.

  • ✔ High Efficiency Conversion
  • ✔ Low Heat Generation
  • ✔ Compact Design

EMI & RFI Suppression

Ferrite beads and clamp cores suppress electromagnetic interference in data lines, power cables, and automotive systems.

  • ✔ Noise Filtering
  • ✔ Signal Integrity
  • ✔ Compliance with EMC Standards

Renewable Energy

Used in solar inverters and wind power systems for reliable magnetic performance under variable loads.

  • ✔ High Thermal Stability
  • ✔ Long Service Life
  • ✔ High Saturation Flux

Industrial Automation

Inductors and transformer cores support motor drives, PLCs, and control systems with robust magnetic solutions.

  • ✔ Vibration Resistant
  • ✔ High Reliability
  • ✔ Customizable Designs

Frequently Asked Questions

What is the difference between MnZn and NiZn ferrites?

MnZn ferrites have higher permeability and are used below 2 MHz, ideal for power applications. NiZn ferrites have higher resistivity and are better suited for frequencies above 2 MHz, commonly used in EMI suppression and RF circuits.

Can you customize core shapes and sizes?

Yes, we offer custom tooling and manufacturing for special core geometries, materials, and coatings based on client specifications.

What are the advantages of amorphous cores?

Amorphous cores offer up to 70% lower core loss than traditional silicon steel, higher saturation flux density, and improved efficiency in high-frequency power systems.

Do you provide technical support?

Yes, our engineering team provides full technical support including material selection, core sizing, and magnetic design assistance.

Get in Touch

For product inquiries, technical support, or custom solutions, visit our official website to contact Huzhou Careful Magnetism & Electron Group.

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