High frequency transformer design principle-Ningbo Chuangbiao Electronics

When designing a high-frequency transformer, the leakage inductance and distributed capacitance of the transformer must be minimized, because the high-frequency transformer in the switching power supply transmits a high-frequency pulse square wave signal. During the transient process of transmission, the leakage inductance and distributed capacitance will cause surge current and peak voltage, as well as top oscillation, resulting in increased losses. Usually, the leakage inductance of the transformer is controlled to be 1% to 3% of the primary inductance.

Leakage inductance of the primary coil----The leakage inductance of the transformer is caused by the incomplete coupling of magnetic flux between the primary coil and the secondary coil, between layers, and between turns.

Distributed capacitance----The capacitance formed between the turns of transformer windings, between the upper and lower layers of the same winding, between different windings, and between the winding and the shielding layer is called distributed capacitance.

Primary winding--The primary winding should be placed in the innermost layer, so that the length of wire used in each turn of the transformer primary winding can be as short as possible, thereby minimizing the wire used in the entire winding, which effectively reduces the distributed capacitance of the primary winding itself.

Secondary winding: After the primary winding is wound, add (3 to 5) layers of insulation padding before winding the secondary winding. This can reduce the capacitance of the distributed capacitor between the primary winding and the secondary winding, and also increase the insulation strength between the primary and secondary windings, meeting the requirements of insulation withstand voltage.

Bias winding----Whether the bias winding is wound between the primary and secondary, or on the outermost layer, is related to whether the adjustment of the switching power supply is based on the secondary voltage or the primary voltage.

Ningbo Chuangbiao Electronic Technology is a professional manufacturer that produces and sells various electronic transformers. The company was established in 2010. The company has now formed a product line characterized by EI type transformers, and also produces various toroidal transformers, C type power transformers, medical transformers, audio transformers, high voltage transformers, industrial control transformers, anti-electric shock, reactors, high frequency transformers and other products. The company has a complete organizational structure and can provide the entire process from planning, procurement, manufacturing, quality assurance, logistics, sales and customer service.

  We select materials from approved high-quality suppliers in accordance with ISO9001 standards. Our employees are specially trained and use the most advanced technology including CNC machines and automatic inspection systems. Each transformer we produce undergoes a comprehensive quality inspection and test before leaving the factory. For more information about transformers, you can consult Ningbo Chuangbiao Electronic Technology. The company is located under the Hangzhou Bay Bridge in Ningbo, Zhejiang, with convenient transportation.