The role of high-frequency transformers used in switching power supplies

The first point is to use high-frequency transformers in the switching power supply to improve the conversion efficiency of the power supply. Because the high-frequency transformer uses a silicon steel sheet iron core, this silicon steel sheet has good magnetic permeability, which can greatly improve the resistivity and magnetic permeability, thereby improving the conversion efficiency of the switching power supply and increasing its output power.

The second point is to protect the safety of the load and the person, it plays a role of safety isolation, and also purifies the high-voltage power supply to prevent interference. We assume that the output voltage of the switching power supply is too high for some reason during operation, so that the excessive voltage will be sent to the protection circuit, then the protection circuit in the switching power supply will open the protection mode, it will "command" the switch The tube stops working, but once the switch tube stops working, there is no way to generate electromotive force at the primary winding end of the high-frequency transformer, so that the induced electromotive force cannot be obtained at the secondary winding of the high-frequency transformer, and there is no voltage output at the output end, thereby protecting The load is protected from high voltage damage. If this phenomenon occurs once the high-frequency transformer is not used, it will be very dangerous. If the switch tube is broken, the high voltage is directly output to the electrical appliance, and the electrical appliance is directly burned, which may even endanger human life.

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