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In "Designing an LLC resonant half-brige power converter" by Hong Huang

Dear all,

In the above documents, equation (7) ( on 7 page) has another phase angle, φi between ioe and voe. However, we already know ioe is in phase with voe. This is from that Re is a pure resistor and further is voe/ioe by definition. So ioe has the phase angle, φv just as voe's.

What about your opinion?