Principle of high voltage power supply based on PWM chip TL494 is introduced in this paper. The adjustment of the voltage is performed by digital potentiometer controlled by MCU.
介绍基于脉宽调制芯片TL 494的高压电源的工作原理，其电压可由单片机控制的数字电位器进行调整。
The basic principle, major controlled process condition, mining process and its characteristics of selective leaching are analyzed. It is a clean mining process of high efficiency.
本文分析了选择性溶浸法开采钾盐矿的基本原理、主要控制的工艺条件、开采工艺流程及其特点，它是一种清洁、高效的开采工艺。
The principle of temperature controlled system for continuous cyclic peritoneal dialysis (CCPD) and the characteristics of each parts are presented.
作者介绍了腹膜透析机恒温控制系统的工作原理以及各个部件的特点。
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