On the road to power‑supply design, engineers are constantly grappling with three fundamental challenges: How can you pack more performance into a constrained PCB footprint? How do you ensure that the power supply remains stable and reliable under high‑current, wide‑temperature‑range conditions? And how can you pass EMC compliance testing on the first attempt, without costly rework, in the face of increasingly stringent standards?

If you, too, are repeatedly plagued by these pain points, then there’s one crucial answer you simply can’t avoid— Amorphous core inductor When conventional ferrite inductors suffer from a sharp drop in inductance under high current, degraded performance at elevated temperatures, and excessive size when miniaturization is required, amorphous‑core inductors have long since become the standard choice for high‑end applications such as new energy systems, industrial power supplies, and energy storage systems. Today, we’ll get to the root of the matter: why your power‑supply design simply must incorporate amorphous‑core inductors.

Many people, upon hearing the term “amorphous magnetic core” for the first time, wonder how it differs from a conventional magnetic core.

Traditional magnetic materials such as ferrites and silicon steels possess a regular crystalline atomic arrangement, much like neatly stacked bricks; in an alternating magnetic field, Magnetic domain reversal This results in substantial losses, and in high-frequency, high-current applications, the issues of power loss and temperature rise are exacerbated to an extreme degree.

Amorphous alloys are metallic soft magnetic materials prepared via ultra-rapid quenching, in which the internal atomic arrangement adopts a disordered “glassy” structure—akin to randomly piled sand—lacking the domain-wall pinning effects associated with crystalline structures. This unique microstructure endows them with three inherent “genetic advantages”:

High Saturation magnetic flux density : Higher than that of ordinary manganese-zinc ferrites 3 to 4 times , which means that, for the same volume, it can withstand Larger current surge , it is not prone to magnetic saturation;

Low-loss characteristics : At high frequencies Iron loss Only for silicon steel 1/5-1/10 , which is also lower than that of ferrite 30% Above, long-term full-load operation. Lower temperature rise ；

Excellent magnetic permeability : High initial permeability, with improved magnetic flux leakage control, EMI suppression effect Far surpasses traditional materials.

These advantages have ensured that amorphous‑core inductors, from the moment of their inception, were destined to serve as the ultimate performance benchmark for addressing the most challenging pain points in high‑end power supplies.

Manufacturing industrial power supplies, Photovoltaic inverter Engineers have surely all encountered this situation: When the power supply operates at full load, the inductance drops significantly, leading to increased output ripple, reduced efficiency, and even overheating and burnout of the switching transistor. The problem.

The root cause lies in magnetic core saturation. Conventional ferrite cores have a low saturation flux density, so under large DC bias currents they readily enter saturation, causing the inductance to drop instantly to less than half its rated value—effectively rendering the inductor “non‑functional.”

rather than the amorphous magnetic core's The saturation magnetic flux density can reach 1.5 T. The above are those of ordinary ferrite. 3 to 4 times , coupled with a well‑designed air gap, it can maintain a stable inductance even under high currents of several tens of amperes. With Anyang Jiayou Take, for example, an amorphous common-mode inductor custom‑designed for a certain energy‑storage customer: even under a 20 A DC bias current, its inductance remains stable. More than 85% of the nominal value Meanwhile, for ferrite inductors of the same specifications, the inductance at this point has already dropped to less than 50% of its rated value, rendering them immediately unsuitable for use.

In power modules for consumer electronics and new-energy vehicles, PCB space is at a premium, and customers are eager to shrink inductor volumes by another 30%. However, to boost current‑carrying capacity, conventional inductors must rely on larger magnetic cores and thicker copper wires—a trade‑off that fundamentally clashes with the drive toward miniaturization.

The high saturation flux density of amorphous magnetic cores perfectly resolves this trade-off. For the same inductance value and current‑carrying capacity, an inductor with an amorphous core occupies only 50%–70% of the volume of one with a ferrite core. For example, a common-mode inductor used in on‑board charger (OBC) power supplies would require a ferrite‑core design measuring φ30×20 mm; switching to an amorphous‑core version reduces the footprint to φ22×15 mm. The volume is directly reduced by nearly half. , perfectly meeting customers’ miniaturization design requirements.

Outdoor photovoltaic inverters, vehicle-mounted power supplies, and industrial control equipment often have to… -40℃~125℃ It can operate across a wide temperature range. In contrast, conventional ferrite cores have a low Curie temperature: their permeability drops sharply at high temperatures and they are prone to brittle cracking at low temperatures, severely compromising power‑supply reliability.

The Curie temperature of amorphous magnetic cores exceeds 400°C, and within a wide temperature range of –55°C to 150°C, both permeability and loss characteristics remain stable, avoiding issues such as demagnetization at high temperatures or brittle fracture at low temperatures. In high–low temperature cycling tests, for example, the amorphous‑core inductors from Jiayou have undergone… 1,000 cycles between −40°C and 145°C After, rate of change of inductance Less than 5% Meanwhile, under the same conditions, certain batches of ferrite inductors have already begun to exhibit… Core cracking , coil desoldering The problem.

Operates stably across a wide temperature range of -55°C to 150°C, with inductance variation of less than 5% after 1,000 cycles—perfect for outdoor and automotive applications.

Failing power‑supply EMC tests is a nightmare for many engineers, especially when it comes to conducted and radiated emissions, which are often directly linked to the common‑mode inductor’s EMI suppression performance.

of the amorphous magnetic core High permeability, excellent magnetic circuit closure, and minimal stray flux. Its common-mode interference suppression performance far exceeds that of conventional ferrite inductors. Moreover, amorphous materials exhibit excellent high-frequency loss characteristics, enabling effective absorption of high-frequency disturbance signals and reducing noise coupled to the power‑supply port. In a vehicle‑mounted DC‑DC power‑supply project for a new‑energy customer, the adoption of an amorphous common‑mode inductor increased the conducted‑emission margin from less than 3 dB to 12 dB, allowing the unit to pass EMC testing on the first attempt and significantly saving debugging time and costs.

Many people assume that an amorphous‑core inductor is simply a matter of switching to a different core material, but that’s not the case. What truly determines an inductor’s performance is the integrated expertise encompassing material selection, magnetic circuit design, winding techniques, and packaging processes.

Take Jiayou as an example: with 14 years of deep industry expertise, it offers a comprehensive end-to-end solution—from design to mass production.

Customized Core Design : Based on the customer’s current, inductance, and volume requirements, we customize amorphous magnetic cores of various specifications, paired with an optimized air-gap design to strike a balance between inductance and saturation current.

Precision winding process : Automated winding equipment is employed to ensure uniform coil winding with excellent consistency, reduce parasitic capacitance, and enhance high-frequency performance.

End-to-end quality control assurance From magnetic core fabrication and coil winding to final product testing, every step undergoes rigorous inspection to ensure consistent performance across batch production.

All-Scenario Adaptation Solution It covers multiple fields, including photovoltaic energy storage, new-energy vehicles, industrial control, and consumer electronics, and can provide specialized packaging solutions—such as high- and low-temperature resistance, vibration resistance, and moisture protection—tailored to customers’ specific application scenarios.

As power supply technology moves toward High frequency, miniaturization, high efficiency, and high reliability As the industry evolves, the performance ceiling of conventional ferrite inductors is becoming increasingly apparent, while the advantages of amorphous‑core inductors are being validated by a growing number of sectors.

It addresses not only superficial issues such as insufficient inductance, excessive size, and failure to meet EMC requirements, but also elevates power‑supply design to a higher level. Performance ceiling , more stable Reliability and the broader Design Space 。

If you’re struggling with the pain points of power‑supply design, consider trying an amorphous‑core inductor—it could be the key to breaking through performance bottlenecks, passing regulatory approval on the first try, and differentiating your product.