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Maximizing Efficiency: The Benefits of Nanocrystalline Cores for Common Mode Chokes

by:Transmart     2023-04-18

Maximizing Efficiency: The Benefits of Nanocrystalline Cores for Common Mode Chokes

As electronic devices continue to become more advanced and integrate into our daily lives, the demand for efficient components has increased significantly. One of the components that have become increasingly vital is common mode chokes. Nanocrystalline cores have shown to be highly efficient in common mode chokes, providing several benefits over traditional ferrite cores. This article will explore the benefits of nanocrystalline cores for common mode chokes.

Understanding Common Mode Chokes

Common mode chokes, also known as EMI filters, are used to suppress electromagnetic interference (EMI) in electronic circuits. They can be found in power supplies, inverters, and other devices that emit significant amounts of EMI. As the name suggests, they are used to filter “common mode” signals, which refer to the EMI signals that appear on both power supply lines equally. Their role is to reduce or eliminate the common-mode noise while allowing the normal signal to pass through without being interfered with.

Traditional Ferrite Cores vs. Nanocrystalline Cores

Traditionally, ferrite cores have been used as the primary material for common mode chokes. They are inexpensive and offer relatively good performance. However, they have limitations in efficiency, especially in high-frequency applications. Nanocrystalline cores, on the other hand, offer several advantages over ferrite cores.

1. Better Performance in High-Frequency Applications

Nanocrystalline cores have a high permeability that allows them to filter high-frequency signals effectively. They can offer a 10x inductance compared to traditional ferrite cores, meaning they can handle more current without saturating.

2. Higher Temperature Stability

Nanocrystalline cores have excellent temperature stability compared to ferrite cores. They have a much higher Curie temperature, which means they can operate at high temperatures without losing their magnetic properties.

3. Reduced Core Size

Nanocrystalline cores offer a lower core volume than traditional ferrite cores. This means that higher inductance values can be achieved with smaller core sizes, making them ideal for applications where space is limited.

4. Lower Losses

Nanocrystalline cores exhibit lower core losses compared to ferrite cores. The lower losses are due to the reduced hysteresis and eddy current losses, which result in a more efficient choke.

5. Improved Saturation Characteristics

Nanocrystalline cores offer improved saturation characteristics compared to ferrite cores. They can maintain an inductance value of up to 80% even under high DC bias conditions.

Applications of Nanocrystalline Cores in Common Mode Chokes

Nanocrystalline cores have several applications in common mode chokes. They are commonly used in EMI filters for solar power inverters, uninterruptible power supplies (UPS), and switch-mode power supplies (SMPS). Their ability to handle high-frequency signals effectively makes them ideal for these applications.


Nanocrystalline cores offer several advantages over traditional ferrite cores when it comes to common mode chokes. They offer improved performance in high-frequency applications, higher temperature stability, reduced core size, lower losses, and improved saturation characteristics. These benefits make them ideal for applications where efficiency and space are critical, such as power supplies, inverters, and SMPS. With the increasing demand for efficient electronic components, nanocrystalline cores for common mode chokes provide a step towards a more efficient future.

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