For a high frequency transformer that meets the insulation and safety standards, the leakage inductance should be 1% to 3% of the primary inductance at secondary open circuit. In order to achieve 1% of the following indicators, in the manufacturing process will be difficult to achieve. Reduce the leakage inductance can take the following measures:
1. Reduce the number of turns NP of the primary winding;
2. Increase the high and wide ratio of the windings;
3. Reduce the insulation between the windings by high frequency transformer manufacturers ;
4. Increase the degree of coupling between windings;
5. Increase the width of the winding (for example, select the EE-type core to increase the skeleton width b).
High-frequency transformers in the design of the time to pay special attention to the loss of the problem, the general loss can be divided into two kinds of DC and AC, DC loss which is usually due to the copper loss caused by the coil. The AC loss of the high frequency transformer is caused by the skin effect of the high frequency current and the loss of the core. High-frequency current through the wire always tends to flow from the surface, which will reduce the effective flow of the wire area, and the equivalent impedance of the wire is much higher than the copper resistance.
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