Filter inductor for power-factor-boosting circuits

Application Areas of Cost-Optimized Filter Inductors

The newly designed filter inductor is suitable for energy-storage and filtering applications in switch-mode power supplies due to its high magnetic flux density (Bₛ value) and low-loss characteristics. Compared with iron-powder cores and ferrite cores of the same volume and permeability, it offers higher energy-storage capability, making it more widely used in AC chokes, output inductors, rotary transformers, pulse transformers, and power-factor-correction circuits.

Filter inductors are typically constructed using high-permeability soft magnetic materials—such as amorphous alloys, nanocrystalline materials, and ferrites—combined with high-quality enameled wire. They are formed through custom core designs and insulated encapsulation processes, making them essential passive components in power electronics and power supply circuits for harmonic suppression, noise filtering, and current stabilization. These inductors exhibit excellent filtering performance, stable impedance characteristics, and strong saturation resistance, making them suitable for both AC and DC circuit filtering applications. Customizable parameters further enhance their ability to improve circuit immunity to interference and operational stability.  

Characteristics of High-Performance Filter Inductors

●High permeability

● Low loss

● Magnetostriction coefficient is close to zero

● High Curie temperature

Outstanding filtering and noise-reduction performance: precisely suppresses high-frequency harmonics and spike interference, purifies circuit current, reduces electromagnetic interference, and ensures stable circuit operation.Stable and reliable impedance characteristics: constant impedance across a wide frequency band, stable performance under both high- and low-temperature conditions, large saturation current, and strong overload resistance.Compact structure with lower losses: optimized magnetic circuit design results in reduced eddy-current and hysteresis losses, controllable temperature rise, and a compact footprint that facilitates easy layout.Exquisite and durable winding process: the windings are evenly distributed, exhibit excellent insulation, high mechanical strength, vibration resistance, and dimensional stability, ensuring a long service life.High parameter customization flexibility: inductance value, current rating, physical dimensions, and lead/terminal configuration can all be customized to suit various circuit designs.High assembly adaptability: Supports surface-mount, through-hole, and vertical/horizontal package types, and is compatible with both automated placement and manual soldering. 

Typical application areas

• Input and output filtering for switch-mode power supplies, adapters, UPS systems, and industrial control power supplies;

• Photovoltaic inverters, energy storage systems, charging piles, and ECU filtering for new-energy vehicles;

• Harmonic suppression inductors for variable frequency drives, servo drives, and home appliance control boards;

• Common-mode/differential-mode filtering components for communication equipment, instruments and meters, and security products.