The high-frequency transformer is a power conversion device operating at frequencies significantly higher than the industrial frequency. Unlike conventional industrial-frequency transformers, its core design and operational principles revolve around the "high-frequency" characteristic, making it an indispensable component in modern power electronics. From everyday devices like mobile phone chargers and computer power supplies to industrial applications such as frequency converters and renewable energy generation systems, high-frequency transformers serve as the core component for achieving efficient and compact power conversion. In recent years, driven by demand across multiple sectors including new energy, 5G communication, smart grids, and consumer electronics, the industry has exhibited robust growth. As the "heart" of power electronics technology, high-frequency transformers are evolving from single-function components toward integrated and intelligent platforms. Against the backdrop of "dual carbon" goals and energy transition, their role in key areas such as renewable energy grid integration, electric vehicles, and data center energy efficiency has become increasingly prominent. With ongoing advancements in materials science and digital technology, high-frequency transformers will gradually break through MHz-level technical barriers, propelling efficient power conversion into a new development phase.

1、 Basic Definition
High frequency transformer: It is an electromagnetic induction type transformer component that operates in a high-frequency switching state. Unlike low-frequency transformers with a frequency of 50/60Hz, it typically operates at frequencies ranging from 20kHz to several hundred kHz or even MHz.
The use of electromagnetic induction principle to achieve voltage rise and fall, electrical isolation, power transmission, and impedance matching is the core component of switching power supply.
2、 Working principle
Similar to ordinary transformers, it follows Faraday's law of electromagnetic induction:
High frequency alternating pulse voltage is applied to the primary winding to generate an alternating magnetic field;
The magnetic core couples the magnetic field to the secondary winding;
Secondary induction generates high-frequency AC voltage and achieves boost/buck through turns ratio;
Simultaneously achieving primary electrical isolation to enhance electrical safety and anti-interference capability.
Using ferrite cores at high frequencies instead of silicon steel sheets for low-frequency transformers results in lower losses, smaller volume, and higher efficiency.
3、 Core structure composition
Magnetic core: commonly used ferrite magnetic cores such as EE, EI, PQ, RM, EC, EFD, UU, etc., with high permeability and low high-frequency loss, suitable for high-frequency magnetization.
Winding coil: primary coil, secondary coil, multi stranded enameled copper wire winding, some with shielding layer to reduce EMI interference.
Skeleton: Flame retardant plastic skeleton, fixed winding, insulation isolation, convenient PCB plug-in installation.
Insulation and tape: interlayer insulation and wrapping tape, meeting the requirements of safety regulations for voltage resistance and creepage distance.
5、 Core functional role
Voltage conversion: Step down/up according to the ratio of turns, adapting to the required voltage of the circuit;
Electrical isolation: Primary and secondary are completely insulated, isolating strong and weak electricity to enhance safety;
Power transmission: transferring electrical energy in a switching power supply to achieve AC-DC and DC-DC conversion;
Impedance matching: Adapt the impedance of the front-end and back-end circuits to improve transmission efficiency;
Suppressing EMI: Paired with a shielding structure to reduce high-frequency electromagnetic interference.
6、 Main application scenarios
Switching power supply, power adapter, fast charging charger;
Single stage PFC circuit, dedicated transformer for flyback power supply;
LED driver power supply, industrial control switch power supply;
Industrial control board, built-in power supply for instruments and meters;
Photovoltaic inverter, energy storage power supply, charging pile auxiliary power supply;
Car DC-DC power supply, car charger;
Communication devices, smart homes, and power boards for small household appliances.
7、 Product Features and Advantages
Small size and light weight, conducive to the lightweight design of devices;
High frequency, low loss, low temperature rise, and high energy efficiency;
Good voltage insulation performance, in compliance with safety standards;
Diverse structures: pin type, horizontal type, vertical type, patch type;
Customized winding according to power, frequency, and transformation ratio, suitable for various switching power supply solutions.
 

Deeply engaged in the field of power magnetic components, continuously creating value for customers
As a professional manufacturer of power magnetic components, our company has always focused on technological innovation and quality improvement, guided by customer needs, providing customized and cost-effective power transformers and inductors solutions for global customers. The launch of this new product marks that our company has reached a new level of technical strength in the field of high-frequency switching power magnetic components, and also provides strong support for the product upgrade of downstream customers.
In the future, our company will continue to increase R&D investment, keep up with industry development trends, and launch more efficient, reliable, and miniaturized power magnetic component products, helping customers seize the initiative in market competition and jointly promoting the high-quality development of the power electronics industry.