Company news about The working principle of high-frequency transformers

The working principle of high-frequency transformers

2026-01-28

High-frequency transformers are the most important component of a switching power supply. Switching power supplies typically employ a half-bridge power conversion circuit. During operation, two switching transistors alternate to conduct, generating 100kHz high-frequency pulse waves. These waves are then reduced in voltage through a high-frequency transformer, resulting in low-voltage alternating current. The number of turns in each winding of the high-frequency transformer determines the output voltage. In a typical half-bridge transformer circuit, the three most prominent high-frequency transformers are the main transformer, the driver transformer, and the auxiliary transformer (standby transformer). Each transformer has its own measurement specifications as stipulated by the country. For example, the main transformer must have a core diameter (height) of no less than 35mm for any power supply above 200W. For the auxiliary transformer, a core diameter of 16mm is sufficient when the power of the power supply does not exceed 300W.
A transformer is a device that transforms alternating voltage, current and impedance. When an alternating current flows through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), inducing a voltage (or current) in the secondary coil.
A transformer consists of an iron core (or magnetic core) and coils. The coils have two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called secondary windings.

Quick link

Home About Us Products Cases News Contact Us

Quick Contact

Address

Gangxia Industrial Park, Donggang Town, Xishan District, Wuxi City，China

Tel

86--13906172558

E-mail

sales@wxderun.com

Our Newsletter

Subscribe to our newsletter for discounts and more.

High Frequency Transformers

Low Frequency Transformers

Inductors And Chokes

Ionized Plasma Generator

Specialty Transformers

High Voltage Coil

Epoxy Filled Inductor

Electromagnetic Valve Coil