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選擇合適的模型進行估算索式提取器

時間:2020-04-18 18:14     瀏覽:

)(*)所示為硅二極管直流工作電路,試求電流 $! 、$+ 、$ , 和輸出電壓 % 的值。 , 圖 !% &% )-二極管直流工作電路 (*)電路圖 -(()采用恒壓降模型后的簡化電路 解:分析 -二極管在直流電路中起單向導電作用,因此應首先判斷二極管 導通與否,然后選擇合適的模型進行估算。索式提取器,判斷二極管導通與否的方法是:斷開 二極管,觀察或計算加在二極管陽、陰兩極間的電壓,若為正偏電壓且大于導通 電壓值,則二極管導通;若為反偏電壓或為小于導通電壓的正偏電壓,則二極管 截止。因此,解題如下: 假設二極管斷開,由圖可得二極管陽極和陰極的電位為 & % . &’ !+0 $10--%2 & !’ 0 / 故 %2. $) 0,二極管導通。導通后的硅二極管等效為 3%4 0的恒壓源,如圖 !% &% )(()所示。 由圖 !% &% )(()可


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