加工定制否	品牌ABB
型号VT-VRPA1-50-10A/V0/0

vt-vrpa1-50-10a/v0/0
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开关式稳压电源接控制方式分为调宽式和调频式两种，在实际的应用中，调宽式使用得较多，在目前开发和使用的开关电源集成电路中，绝大多数也为脉宽调制型。因此下面就主要介绍调宽式开关稳压电源。
　　 调宽式开关稳压电源的基本原理可参见下图。
对于单极性矩形脉冲来说，其直流平均电压uo取决于矩形脉冲的宽度，脉冲越宽，其直流平均电压值就越高。直流平均电压ｕ。可由公式计算，
　　 即uo=um×t1/t
　　 式中um为矩形脉冲电压值；t为矩形脉冲周期；t1为矩形脉冲宽度。
　　从上式可以看出，当um 与t 不变时，直流平均电压uo 将与脉冲宽度t1 成正比。这样，只要我们设法使脉冲宽度随稳压电源输出电压的增高而变窄，就可以达到稳定电压的目的。
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