忽略原边线圈电阻的条件下推导出来的。
变压器原边线圈电感的感抗远远大于负载电阻对原边的折算值；
The inductive reactance of a primary coil is much larger than the value of load resistance converted into the primary;
中间抽头变压器由于两个副边线圈是分时工作，其线圈损耗模型不同于无抽头原副边线圈同时工作的变压器。
The winding loss model of central-tapped transformer in SMPS is different from that of the non-tapped transformer because the two secondary windings work in different time intervals.
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