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UC3842设计仿真奇怪问题

线路如附件,仿真的附件也在 MULTISIM 11仿真的

初级端的输入电压为16.246V

仿真上看到的开关F=21.3KHZ 假设占空比为20%

假设变压器Ae=180mm2   Bac=0.234mT,初级绕组Np=3.62匝

然后根据每匝伏数相等算出Np:Ns=6.2

仿真后D7的阳极电压居然出现了负电压,变压器是同名的,应该是正电压啊?

哪位大侠能指点下,谢谢了

 

 

 

 

UC3842 B.zip