High-frequency transformer

High-frequency switching power supply transformer as a main component. Switching power supplies generally use the half-bridge power conversion circuit, the work of two switching transistors alternately turn to generate the 100kHz high-frequency pulse, and then high-frequency step-down transformer, the output low voltage alternating current, high-frequency transformer windings each The turns ratio determines how much the output voltage. A typical half-bridge transformer circuit of the most prominent is the three high-frequency transformer: the main transformer, driving transformers and auxiliary transformers (standby transformer), the national provisions of each transformer has its own metrics, such as the main transformer, As long as more than 200W power supply, its core diameter (height) on not less than 35mm. The auxiliary transformer, the power supply when the power does not exceed 300W of its core diameter 16mm is enough.
Transformer works
AC voltage transformer is a transformation, current and impedance of the device, when the primary coil in the pass there is AC current, the iron core (or core) will be generated in the exchange of flux, so that induced in secondary coil voltage (or current).
Transformer from the core (or core) and the coil composed of two or more coil windings, which then called the primary coil winding of the power supply, and the rest is called secondary coil windings.
High-frequency transformer is the operating frequency exceeding IF (10kHz) power transformers, mainly for high-frequency switching power supply for high-frequency switching power supply transformer, but also for the high-frequency and high-frequency inverter power supply for high-frequency inverter welding machine in reverse variable power transformer. According to operating frequency of high or low, can be divided into several grades: 10kHz-50kHz, 50kHz-100kHz, 100kHz ~ 500kHz, 500kHz ~ 1MHz, 1MHz or more. Relatively large transmission power, the working frequency is relatively low; transmission power, relatively small, relatively high operating frequency. [1]