中学物理实验室几乎那备有实验用的备种教学用的电源。本文介绍用简单的方法对“直流高压电源(J1205型)”等进行改进,使其具有逆变功能,从而使该装置除保留原功能外,停电时利用它仍交流输出。除J12205型电源外,很多“中学教学” High school physics labs are equipped with experimental power supplies for teaching and learning. This article describes the use of a simple method of “DC high-voltage power supply (J1205 type)” and other improvements, so that it has an inverter function, so that the device in addition to retaining the original function, in the event of a power outage, it is still AC output. In addition to J12205 power supply, many “secondary teaching”