1, High-frequency transformer is the power transformer whose working frequency exceeds the intermediate frequency (10kHz), mainly used for high-frequency switching power transformer in high-frequency switching power supply, also used for high-frequency inverter and high frequency inverter welding machine for high Frequency inverter transformer. By the frequency of work, can be divided into several grades: 10kHz- 50kHz, 50kHz-100kHz, 100kHz ~ 500kHz, 500kHz ~ 1MHz, 1MHz above.
2, high-frequency transformer is the most important part of the switching power supply. Switching power supply is generally half-bridge power conversion circuit, work when the two switches turn on to produce high-frequency pulse 100kHz pulse, and then step-down by high-frequency transformer, the output low-voltage AC, high-frequency transformer winding coil The turns ratio determines the output voltage. Typical half-bridge transformer circuit is the most prominent three high-frequency transformers: the main transformer, drive transformer and auxiliary transformer (standby transformer), each transformer has its own national standards, such as the main transformer, As long as it is more than 200W power supply, the core diameter (height) shall not be less than 35mm. The auxiliary transformer, the power supply does not exceed 300W when the core diameter of 16mm is enough.
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