电容C、电感L和电阻R三个元件可以组成许多功能电路,应用在各种实际电路中,对于初学者来说,掌握这些电路的原理及其应用非常必要,下面将RC、RL和LC三种基本电路剖析如下。一、RC电路①RC电路的主要特性RC电路可以用来超前或滞后相位。如图1所示。由于电阻上的电压与电流同相,电容两端的压降不能突变,Vo取自C1上的压降,所以Vo滞后Vi。可以用矢量关系予以说明,如图2所示。输入信号 Capacitor C, inductance L and resistance R three components can be composed of many functional circuits, used in a variety of practical circuits, for beginners, to master the principles of these circuits and its application is necessary, the following RC, RL and LC three The basic circuit analysis is as follows. A, RC circuit ① RC circuit’s main features RC circuit can be used to advance or lag phase. As shown in Figure 1. Since the voltage on the resistor is in phase with the current, the voltage drop across the capacitor can not be abrupt, Vo is taken from the voltage drop across C1, so Vo lags Vi. Vector relations can be used to illustrate, as shown in Figure 2. input signal