High-frequency transformers can increase or decrease input voltages by using the turns ratio of the primary and secondary coils. For example, in a switching power supply, a high-frequency transformer converts high-frequency pulse waves into alternating currents of different voltage levels to meet the needs of the device.
There is no direct electrical connection between the primary and secondary coils, thereby isolating the input and output circuits, improving safety and reducing interference. This feature is particularly important in medical equipment and precision electronic systems.
Energy is transferred from the primary side to the secondary side through a high-frequency alternating magnetic field, and the rhythm and efficiency of energy transfer are controlled in conjunction with switching devices (such as IGBTs or MOSFETs). For example, in an inverter power supply, a high-frequency transformer is responsible for the intermediate link of energy conversion.
Additional functions and features
Improved efficiency and miniaturization: High-frequency operation (above 10kHz) reduces core losses, making the transformer smaller and more efficient (typical efficiency can reach 97%), suitable for compact electronic devices.
Reduced electromagnetic interference (EMI): Optimized design and shielding technology can suppress the noise generated by high-frequency switching and meet electromagnetic compatibility requirements.
Multi-channel output support: Through multi-winding design, it can provide multiple voltage levels for different circuits at the same time, simplifying the power supply structure.
Summary: High-frequency transformers achieve efficient and safe power conversion through three core functions, becoming a key component of high-frequency electronic devices such as switching power supplies and inverters.

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