在生产与科学实验中,除了广泛应用交流电之外,在某些场合,如汽车蓄电池充电、直流电动机和电子仪器的使用等,都需要稳定的直流电。常用的直流稳压电源由电源变压器、整流电路、滤波电路和稳压电路组成,结构框图如图1所示。电源变压器把交流电变为整流所需的电压,再利用整流元件的单向导电特性将交流电变成单向脉动直流电压,最后经过滤波 In production and scientific experiments, in addition to the widespread use of alternating current, in some cases, such as car battery charging, DC motor and electronic equipment use, etc., require a stable DC. Commonly used DC power supply from the power transformer, rectifier circuit, filter circuit and voltage regulator circuit, the block diagram shown in Figure 1. The power transformer turns the alternating current into the voltage needed for rectification, and then uses the one-way conduction characteristic of the rectifying element to convert the alternating current into a unidirectional pulsating direct-current voltage, and finally, the filtered