13问答网 > 自制了一个整流滤波电路，接上双12v变压器以后通电，直流电压变成了±2

自制了一个整流滤波电路，接上双12v变压器以后通电，直流电压变成了±2

0v怎么解决
2025-03-16 02:35:17
推荐回答（1个）
回答1：

　　因为没有接负载吧？空载电压升高时正常现象，接上额定负载电阻电压就正常了（14~15V）。
　　空载输出直流电压为输入交流电压有效值的1.414倍，而空载变压器电压也会超出额定电压值10~20%（可以用万用表测量检验），达到+-20V不奇怪。

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