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。
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。
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。
While using the manual switch in the oblique lane, need manpower to pull railway switches, time-consuming, strenuous and unsafe like this.
在斜巷使用手动道岔时，需要人力去扳道岔，这样既费时、费力又不安全。
By using two additional diodes and a push-pull transformer, this converter achieves not only ZVS of all active switches but also high reliability.
通过采用推挽变压器和两个附加的二极管，该变换器可以实现零电压开关，并且有较高的可靠性。
By using two additional diodes and a push-pull transformer, this converter achieves not only ZVS of all active switches but also high reliability.
通过采用推挽变压器和两个附加的二极管，该变换器可以实现零电压开关，并且有较高的可靠性。
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