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<p><span style="font-size: 14px;"><span style="font-family: 宋体;"> 大家之前都了?strong>开关电源变压器</strong>有全桥式还有半桥式之分，其实全桥式里面又有交流输出全桥式开关电源变压器和直流输出全桥式开关电源变压器，那们它们的匝数该怎么计算呢？下面就由<a href="http://www.chenfeipower.com">深圳晨飞电子</a>的技术团队来为大家讲解一下：</span></span></p>
<p><span style="font-size: 14px;"><span style="font-family: 宋体;"> 全桥式变压器开关电源如果用于DC/AC或AC/AC逆变电源，即把直流逆变成交流，或把交流整流成直流后再逆变成交流，这种逆变电源一般输出电压都不需要调整，工作效率很高?br />
用于逆变的全桥式变压器开关电源一般输出电压uo都是占空比等?.5的方波，由于方波的波形系?有效值与半波平均值之?等于1,因此，方波的有效值Uo与半波平均值Upa相等，并且方波的幅值Up与半波平均值Upa也相等。所以，只要知道输出电压的半波平均值就可以知道有效值，再根据半波平均值，就可以求得半桥式开关电源变压器初、次级线圈匝数比?br />
上面我们讲解了交流输出全桥式开关电源变压器初、次级线圈匝数比的计算，下面来讲讲直流输出电压非调整式全桥开关电源变压器初、次级线圈匝数比的计算：<br />
直流输出电压非调整式全桥开关电源，就是在DC/AC逆变电源的交流输出电路后面再接一级整流滤波电路，请参?-48.这种直流输出电压非调整式全桥开关电源的两组控制开关K1和K4、K2和K3的占空比与DC/AC逆变电源一样，一般都?.5,整流输出电压的有效值Uo与半波平均值Upa基本相等。因此，直流输出电压非调整式全桥开关电源变压器初、次级线圈匝数比可直接利用如下公式来计算。即?nbsp; <br />
<img width="462" height="36" alt="" src="/UploadFiles/FCK/1(5).jpg" /><br />
同样，在低电压、大电流输出的情况下，一定要考虑变压器的工作效率以及整流二极管的电压降和4个开关器件接通时的电压降?/span></span></p>
<p><span style="font-size: 14px;"><span style="font-family: 宋体;"> 小编提醒您，在设计开关电源变压器的时候，一定要从多方面资料进行参考，这样它设计得最有价值。本篇文章由深圳晨飞电子技术团队提供，转载请注明。网址：http://www.chenfeipower.com?br />
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