High-Frequency Transformer Design: Key Considerations for Switching Power Supplies
— The high-frequency transformer is the heart of every switching power supply. It provides galvanic isolation, steps the voltage up or down, and transfers energy across the isolation barrier at frequencies from tens of kilohertz to several megahertz. Unlike a mains-frequency transformer, its design is a trade-off between core material, winding structure, parasitics and thermal […]
How to Choose the Right Power Inductor for Your Application
— A power inductor looks like a simple part, but choosing the wrong one is one of the most common causes of power supply instability, excessive heat, audible noise and early field failures. With a clear understanding of a few key specifications, you can shortlist the right component in minutes and avoid costly redesign cycles. […]
EMI Filter Design: A Practical Guide for Power Electronics
EMI filters are essential for power electronics to meet conducted emission standards such as EN 55032, CISPR 11, and FCC Part 15. A well-designed filter ensures compliance while maintaining efficiency. Basic EMI Filter Topology A typical EMI filter consists of a common-mode (CM) choke, X-capacitors between line and neutral, and Y-capacitors from line/neutral to ground. […]
Ferrite vs. Nanocrystalline Cores: Which Is Right?
Choosing between ferrite and nanocrystalline cores is critical for transformer and inductor performance. Both materials serve different purposes in power electronics. Ferrite Cores Ferrite (MnZn or NiZn) is cost-effective and works well at high frequencies (100 kHz to MHz range). It is ideal for SMPS transformers, EMI filter chokes, and small signal applications. Ferrite cores […]
Toroidal Inductor: What It Is and When to Use It
A toroidal inductor is a coil wound around a donut-shaped magnetic core, widely used in power supplies, EMI filters, and renewable energy systems. Its symmetrical geometry delivers lower electromagnetic interference (EMI) and higher efficiency compared to solenoid inductors. How Toroidal Inductors Work The toroidal shape confines magnetic flux within the core, minimizing stray fields. This […]
Sirui-Tech Achieves ISO 9001:2015 Quality Management Certification
Shaanxi SiRui Technology Co., Ltd. is proud to announce that our quality management system has been audited and certified to ISO 9001:2015, covering R&D, sales and import/export of magnetic components including nanocrystalline cores, common mode chokes, power inductors, current sensors and electrical transformers. This certification demonstrates our commitment to consistent quality, customer satisfaction and continuous […]
New High-Frequency Transformer Series for EV Charging Applications
Sirui-Tech launches a new family of compact high-frequency transformers designed specifically for next-generation EV charging stations and onboard power supply systems. The new series features improved energy efficiency (up to 98.5% at rated load), reinforced insulation (double insulation between primary and secondary), and a compact footprint optimized for space-constrained charging electronics. Operating frequency ranges from […]
Expanding Nanocrystalline Core Production for High-Precision Applications
We have expanded our nanocrystalline core production line to support growing demand for ultra-low-loss magnetic components in current sensors and high-precision transformers. The expanded range includes ring cores, cut cores and C-cores in various dimensions, with permeability up to 80,000 and loss figures significantly lower than conventional ferrite at high frequencies. These cores are ideal […]
RoHS & REACH Compliance Verified by SGS and CTI
Our ferrite cores, nanocrystalline cores and finished magnetic components have been independently tested and verified to meet EU RoHS 2.0 and REACH SVHC requirements by SGS and CTI laboratories. Test reports confirm compliance with restricted substance limits including lead, mercury, cadmium, hexavalent chromium, PBB, PBDE and four phthalates. REACH SVHC screening covers all currently declared […]
Common Mode Choke Solutions for Renewable Energy Systems
Sirui-Tech offers high-performance common mode chokes engineered to suppress electromagnetic interference (EMI) in photovoltaic inverters, energy storage systems and EV charging infrastructure. Our chokes use nanocrystalline or Mn-Zn ferrite cores tailored to specific frequency bands, with impedance curves optimized for differential-mode and common-mode noise in both grid-tied and off-grid renewable systems. Custom designs are available […]