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High-frequency transformers Compared to traditional power frequency transformers, MagTop high-frequency transformer manufacturers specifically analyze their advantages
Jan 27, 2018

High-frequency transformers Compared to traditional power frequency transformers, MagTop high-frequency transformer manufacturers specifically analyze their advantages


In the traditional high-frequency transformer design, due to the limitation of core material, its operating frequency is low, generally around 20 kHz. With the continuous development of power technology, the miniaturization, high frequency and high power ratio of power systems have become an eternal research direction and development trend. Therefore, the study of higher-frequency power transformers is a key factor in reducing the size of the power system and increasing the output power ratio of the power supply.


As the main component of switching power supply, Shenzhen high frequency transformer manufacturers concluded that high frequency transformers have the following advantages over traditional power frequency transformers:


The high-frequency transformer made of ferrite material has the characteristics of high conversion efficiency and small size; while the traditional power frequency transformer operates at 50Hz, the output of the same power requires a large cross-sectional area, resulting in a bulky transformer, which is not conducive to Power miniaturization design, and power conversion efficiency is also lower than the switching power supply.


The switching power supply used by computers generally uses a half-bridge power conversion circuit. When operating, two switching transistors turn on to generate high-frequency pulse waves of 100 kHz, and then step down through a high-frequency transformer to output low-voltage alternating current. In this circuit, the maximum current of the switch tube has a certain limit on the output power of the power supply (usually applied to the 300W power MOS tube is relatively large, and some power supplies even use a switch tube with a current resistance up to 10A). The ratio of the number of turns of each winding coil of the frequency transformer determines the output voltage. Due to the high frequency operation, there is a high requirement for the quality of components and the matching of circuits.


Of course, high-frequency transformers also have certain accidents. Shenzhen high-frequency transformer manufacturers objectively pointed out that the high-frequency transformer loop problem will cause abnormal noise.


High-frequency transformer loop problem will cause high-frequency transformer abnormal sound: high-frequency transformer loop problem refers to the high-frequency transformer loop oscillation and cause high frequency transformer howling.

1. Improper wiring of the circuit board, resulting in interference caused oscillations, resulting in the sound;

2. Improper setting of the feedback loop parameters causes the loop to be unstable, causing oscillations and sounds;

3. The quality of the components in the loop, such as the input filter capacitor capacity is insufficient, the quality of the output rectifier fast recovery diode is not good, the quality of the power MOS transistor is not good, the quality of the high-voltage capacitor or diode of the RCD recoil absorption loop is not good, etc. These problems can cause shocks and cause noise.


So here, MagTop high-frequency transformer manufacturers to remind you that the high-frequency transformer loop problem that refers to the high-frequency transformer loop oscillations caused by high-frequency transformers howling, we must pay attention!


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