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钳位二极管 (TVS二极管)的概念 钳位表示限制电路中的电压,而钳位二极管是用于限制电路中某一点的电位的二极管。 通常情况下,连接到钳位二极管一端的电位必须为恒压,即假定该端电位不变,作为参考电位端。另一端为钳位端,其电位发生变化,是需要限制的一端。二极管的钳位作用将钳位. 每个ZnO晶粒的响应电压约为4V,因此压敏电压是通过将晶粒串联以形成电流路径来实现的。 下图中的每条红色路径画出了等效背靠背二极管串联形成的电流路径,多条这样的路径并联形成了二极管网络。 急剧的击穿特性使压敏电阻能够提供优异的瞬态抑制性能。 负向钳位电路工作原理: Ui正半周时,D1导通,C2充电至Ui值 (左正、右负),UO=0V。 Ui负半周时,D1反向截止,Uo=UC1+Ui (正半周) =-2V 四、钳位的工作原理 二极管钳位是利用了二极管的单向导电性,就是当二极管负极电压大于正极时,二极管截止,而当正极电压大于负极并且导通之后,二极管两端电压被. 不过要注意:此时二极管处于反向接法,即稳压二极管工作在反向电压下。 设,上图中的稳压二极管稳定电压是12V,最大稳定电流是25毫安。
BAT54S在电路中的作用可以从以下几个方面进行详细分析: • 器件基本特性 BAT54S是一种双串联肖特基二极管,具有低正向压降特性 其典型导通电压为320mV,远低于普通硅二极管的600-700mV 这种低导通电压特性使其特别适合用于精密电压钳位应用 • 具体电路功能实现 在所述电路中连接在3.3V电源和中间. 总结一下: 当上管关闭以后,此时电感续流电流最大,下管的二极管导通,SW会被钳位在-0.3V,因此自举电容在此刻充电最快;随着电感电流的不断下降,降到为0时,此时SW会被输出电压钳位在VOUT,此时充电的电流最小。 因此,如图 2-5(a)所示的逆变器电路的输出电平数有三个,故称之为二极管钳位式三电平逆变器。 该电路中钳位二极管的作用是把桥臂上与其相连接的点上的电压钳到零电位(直流电源电压的中点电位),并防止直流分压电容 C d1 (或 C d2)工作时短路。 其基本工作原理—— 全桥逆变电路输出一定频率的方波电压,在LLC、或LC谐振回路中产生滞后于基波电压的基波电流,从而在功率器件的开通时刻使得电流流过其反并联二极管(将功率器件两端电压钳位为零),实现零电压开通,进而实现DC-DC变换器的软开关。
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