中学物理演示辉光放电所用的高压电源是感应圈,感应圈效率低、笨重,且易击穿损坏.现在,笔者介绍一种直流高压电源,它具有制作成本低、轻巧、不易击穿损坏等特点.原理如图1所示.图1B1为电源变压器,次级输出为1 2V ,功率为1 0W ;B2 为黑白电视机的分立式行输出(俗称高压包) ;BG为 The high-voltage power supply used in the glow discharge of middle school physics demonstration is the induction coil. The induction coil is inefficient, heavy, and easy to breakdown. Now, the author introduces a DC high-voltage power supply, which has the advantages of low manufacturing cost, light weight, and easy breakdown resistance. Features. The principle is shown in Figure 1. Figure 1B1 is the power transformer, the secondary output is 1 2V, the power is 10W; B2 is the discrete line output of the black and white TV (commonly known as the high voltage package); BG is