《程控交换原理》是2006年邮电大学出版的图书，作者是林康琴、叶奕亮、曲桦。该书主要介绍了电话交换技术基础、信号系统、程控数字交换基本原理等内容。
介绍一种数字程控交换实验系统的组成和原理，以及系统硬件和软件的实现。
This paper introduces the component and principle of Digital Program Control Exchange Experimental System, as well as the realization of the hardware and software.
介绍了一种用于程控交换机的由VMOS管驱动的DC - DC PWM开关电源的工作原理与电路设计。
This paper introduces a kind of DC-DC PWM switching mode power supply driven by VMOS and applied to Program Exchange. The principle and circuit are presented.
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