High-frequency transformers are power transformers whose working frequency exceeds the intermediate frequency (10kHz). They are mainly used as high-frequency switching power supply transformers in high-frequency switching power supplies. They are also used as high-frequency inverters in high-frequency inverter power supplies and high-frequency inverter welding machines. Change the power transformer. According to the working frequency, it can be divided into several grades: 10kHz-50kHz, 50kHz-100kHz, 100kHz~500kHz, 500kHz~1MHz, and above 10MHz.

Inductor is a circuit element that generates electromotive force due to the change of the current passing through, thereby resisting the change of current. This property is called inductance.

There are many types of inductance components, which are called differently depending on their appearance and function. The enameled wire is wound in multiple turns, and the inductors often used as electromagnets and transformers are also called coils according to their appearance. It is used to provide large reactance to high frequency through direct current or low frequency. Depending on the function, it is often called choke or choke. Often used with ferromagnetic materials to install larger inductors used in transformers, motors and generators, also called windings. The wire passes through the magnetic substance without a coil shape. It often acts as a small inductance for high-frequency filtering, and is often called a bead according to its appearance.