Parametrizing the Coil Construction and Coupling Coefficients of Inverter Transformers in JMAG

Masahiro Kitagawa
MINEBEA CO.,LTD Electronic Circuit Development Department Development Division Electronic Device & Component Business Headquarters


Generally, CCFL inverters used for backlighting devices such as LCD TV operate via the series resonance of the leakage inductance of the transformers and the parasitic capacitance of the lamps. The frequency of the series resonance is important factors because it affects the efficiency of the circuits and the operating characteristics of the lamps. This presentation will describe how to obtain the necessary leakage inductance by evaluating the coupling coefficient using JMAG before designing the transformer while also investigating the relationship between the coil construction and the coupling coefficient.

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