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UCC3895移相全桥电路老化烧变压器故障

Other Parts Discussed in Thread: UCC3895

你好,新做样机输入390V,输出20V 60A。老化2小时断电冷却后重新上电带载开机时出现炸管,检修发现变压器初级电感由之前700uH变为370uH.初步判断为变压器老化损坏。请教出现此故障的原因是电路设计缺陷还是变压器本身质量问题。附件是UCC3895原理图.

Protel Schematic.pdf