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3。占空比过小，或变压器原边感量较小，变压器存储的能量不够，造成输出电容频繁的过放电
除了这些，还有吗？
首先确定周围没有发热元件传热，然后采用增加电容并联看温度是否降低。同时在输出整流位置增加高频电容。
