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Effect of Leakage inductance in SMPS transformers

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T

treez

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Do you agree that the effect of leakage inductance on Duty Cyle is less prevalent in Flybacks than Forward Converters?
(ie The leakage inductance in a forward converter's transformer means the duty cycle will be increased more so than the case for a flyback)?

For example, with K factor of 0.99 in a Forward converter’s transformer, the standard Forward converter equation Vout/Vin = ND is not very accurate. (because D needs to be significantly greater than this equation predicts)

-But with a flyback with a K factor of 0.99 in its transformer, the standard flyback equation Vout/Vin = ND/(1-D) would be very accurate.

(considering CCM in all cases).
The attached simulation certainly shows this.
 

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  • Forward and Flyback with leakage.txt
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