二极管电路简介

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                    <section><section powered-by="gulangu"><section><section><p><img src="image/20201019/83bfae09b1361c691658441a7dbd0392_1.gif" /></p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>二极管主要特性</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>1、单向导电性。</p><p>2、二极管一旦导通后，其压降基本不变</p><p>3、要使二极管导通，不仅正极电压要大于负极电压，而且要大于一定的值，即硅二极管为0.6~0.7V，锗二极管为0.2~0.3V。</p><p>4、二极管的温度特性：在二极管导通之后，其压降基本不变，但还是随温度变化而有些变化，当温度升高时，其管压降要下降一些，利用这一特性可在电路中起补偿作用。</p><p>5、二极管导通后内阻很小，且基本不变，但随流过二极管电流的大小变化而有些变化，当电流增大时其内阻要减小，反之则要增大些，利用这一特性可进行有关信号的控制。</p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>二极管的主要作用</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; 二极管的主要作用有整流作用、检波作用、限幅作用、保护作用、补偿作用、隔离作用等。</p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>二极管限幅电路</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp;输入信号电压Vi，在正半周期间，D1的负极电压高于正极，D1截止，D1对正半周信号无影响；在负半周期间，D1的负极电压低于正极电压，当电压超过D1导通电压时，D1导通，D1导通后压降基本不变。所以输出信号电压Vo的负半周被削顶。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/dc8a8e0c53fcba2106f3de6f54f8f465_2.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; 双向限幅电路<br  /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/993a2c7c12f4719dfd87723add3223b9_3.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>二极管隔离电路</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; D1为隔离二极管，它的作用是让+V经R2、D1加到T1管基极，而不让Vi电压经R1、D1、R2影响+V，因为当Vi＞+V时，D1为反向偏置而处于截止状态。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/7aba53bdb94b3182fdef9efbbb99209d_4.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section> <section powered-by="gulangu"><section><section><p>欢</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>迎</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>关</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>注</p></section></section></section> </section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section> <section powered-by="gulangu"><section><section><p><img src="image/20201019/617b5c241f64babaa7d408b8fb73c1a1_5.jpg" /></p></section></section></section> </section><section> <section powered-by="gulangu"><section><section> </section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>关注我们</p><p>一起涨姿势！</p></section></section></section> </section></section></section></section>