Switching power supply and mutual induction principle of high frequency output transformer

- Jan 25, 2019-

The High Frequency Output Transformer is a device that converts alternating voltage, current, and impedance. When an alternating current is passed through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core) to induce a voltage (or current) in the secondary coil. ). The transformer consists of a core (or core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the other winding is called the secondary coil. In the generator, whether the coil moves through the fixed coil through the magnetic field or the magnetic field, the potential can be induced in the coil. In both cases, the value of the magnetic flux is constant, but the number of magnetic fluxes intersecting the coil is Change, this is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual inductance to transform voltage, current, and impedance.


The high frequency output transformer is the most important component of the switching power supply. There are many topologies in switching power supplies. For example, a half-bridge power conversion circuit, in which two switching transistors are turned on in turn to generate a high-frequency pulse wave of 100 kHz, and then transformed by a high-frequency transformer to output an alternating current, and the ratio of the turns of each winding of the high-frequency transformer is determined. What is the output voltage?


The most conspicuous of the High Frequency Output Transformer's half-bridge transformer circuit are three high-frequency transformers: the main transformer, the drive transformer and the auxiliary transformer (standby transformer). Each transformer has its own measurement standard in the national regulations, such as The main transformer, as long as it is more than 200W, its core diameter (height) must not be less than 35mm. The auxiliary transformer, when the power of the power does not exceed 300W, the core diameter of 16mm is enough.www.ctsensorducer.com