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辅助绕组电压与计算值相差几倍是何原因

我设计的变压器主要输出是5V,辅助绕组是12V。主输出绕组绕3TS,辅助绕组是5TS。主输出闭环调节可以稳定在5V,但辅助绕组电压超过12V,达到19V,不知是什么原因?