说明：  一个95-265VAC输入，12VDC500mA输出的开关电源设计，可以应用在工业控制的主控板电源。本设计已经量产，读者可放心下载。
(A 95-265VAC input, 12VDC500mA output switching power supply design can be applied to the main control board power supply for industrial control. The design has been produced, and readers can download it.)