Coupled inductor SEPIC efficiency improved by adding leakage inductor

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T

treez

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....the above article states that introducing an inductance into the loop containing the sepic coils and capacitor increases the efficiency. -Can this br true? -have you ever heard of making a hard switching converter more efficiency by simply shoving in an inductor? (the article says its the leakage inductor, but it could just as well be a separate inductor placed in the circuit)
 

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