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本文介绍了ＮＤ５型机车三大件专用直流变换电源的研制，包括主回路和控制回路的设计，阐述了脉冲宽度调制式（ＰＷＭ）直流变换电源的工作原理。
This paper introduces the research and development of the ND5 locomotive three-part dedicated DC conversion power supply, including the design of the main circuit and the control loop, and expounds the working principle of the pulse width modulation (PWM) DC conversion power supply.