This paper presents a novel zero voltage and zero current switching (ZCS) PWM push pull three level converter in which the voltage stress of switches is input voltage.

本文提出了一种新型的零电压零电流开关pwm推挽三电平直流变换器，其中开关管的电压应力为输入电压。

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This article has made statistic and analyses on many types of flameproof button and switches used in coalmine, such as travel switch, limit switch, pull switch, and so on.

就煤矿井下现用的隔爆按钮以及行程开关、限位开关、打点器、拉线开关、井口开关等进行了统计、分析，针对使用中出现的问题提出了改进措施。

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There are some intrinsic drawbacks in traditional push-pull converter, such as higher voltage stress and hard-switching of the switches, so the application area of the converter is limited.

传统的推挽变换器存在着一些固有的缺点，诸如开关管的电压应力高、难以实现软开关等，限制了它的应用范围。

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If a daydreamer fails to pull the bottle away, the water automatically switches off after 20 seconds.

WSJ: With Bottle-Fillers in Mind, the Water Fountain Evolves