Can inductors of a PWM converter share the same core?

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The issue of coupled inductors in PWM converters and whether
inductors can share the same core is discussed and explained by Prof. Sam Ben-Yaakov.
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Hello Professor, if it is possible for inductors to share the same core then how to decide their dot polarity (ie. both windings should be wound in same direction or opposite to each other). Pls explain I am not able to understand. Thankyou.

darshanchirke
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Hi Sam... In the case of the forward converter sharing inductor cores, doesn't this also help the cross-regulation some ?

kiq
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May I ask how you get L1/L2=(N1/N2)^2?

maohangqiu