重复频率脉冲电源研究

发布时间：2018-01-09 05:07

本文关键词：重复频率脉冲电源研究　出处：《华中科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：在冶金，电镀，激光等工业领域，脉冲电源得到了广泛的应用。与传统的连续电源相比，脉冲电源具有瞬时功率大，脉宽和频率可调，节省能量，效率高等优点，因此，在某些场合它的应用越来越普遍。脉冲电源按单次工作还是重复工作可分为单脉冲电源和多脉冲电源。单脉冲电源放电形成脉冲后必须停机充电，当充电完成后才能进行下一次放电，输出的是参数固定的单向脉冲，脉冲参数的变化，需要在停机后才进行重新设置，一般应用于大功率场合；多脉冲电源即重复频率脉冲电源，可重复输出多组单向或周期性换向脉冲，它们的脉宽、频率、幅值、持续时间等参数各不相同，一般应用于中小功率场合，本文研究了重复频率脉冲电源在激光上的应用。由于激光电源需要的是脉冲电流源，因此本文主电路使用移相全桥ZVS充电拓扑，后级使用电流滞环形成续流网络，随时准备为激光负载提供电流，脉冲电流的频率可通过后级开关的通断时间控制，从而形成频率可调的重复频率脉冲电源。本文首先分析了几种常见的充电方案，在此基础上，选择主电路拓扑为移相全桥，并分析了移相全桥的电路原理和模型，根据实际的参数要求，，探讨了主电路的充电方案，通过仿真分析，选择了恒功率充电方案，减少了电源输入端功率的波动，有利于减少电网的谐波，最后通过参数计算和试验仿真，证明了此方案的可行性。
[Abstract]:Pulse power supply has been widely used in metallurgy, electroplating, laser and other industries. Compared with the traditional continuous power supply, pulse power supply has a large instantaneous power, pulse width and frequency adjustable, saving energy. High efficiency and other advantages, therefore, in some cases, its application is becoming more and more common. Pulse power supply can be divided into monopulse power supply and multi-pulse power supply according to single work or repeated work. The output is a fixed parameter one-way pulse, pulse parameters change, need to be re-set after the shutdown, generally used in high-power situations; Multi-pulse power supply, that is, repetitive frequency pulse power supply, can repeatedly output multiple groups of unidirectional or periodic commutation pulses, their pulse width, frequency, amplitude, duration and other parameters are different, generally used in small and medium power situations. In this paper, the application of repetitive frequency pulse power supply to laser is studied. Since the laser power supply needs a pulse current source, the main circuit uses phase-shifted full-bridge ZVS charging topology, and the rear stage uses current hysteresis to form a continuous current network, which is ready to provide the current for the laser load at any time. The frequency of the pulse current can be controlled by the on-off time of the back stage switch, thus the frequency adjustable repetition rate pulse power supply can be formed. Based on the analysis of several common charging schemes, this paper selects the main circuit topology as the phase-shifted full bridge, and analyzes the circuit principle and model of the phase-shifted full-bridge, according to the actual requirements of the parameters. The charging scheme of the main circuit is discussed. Through simulation and analysis, the constant power charging scheme is selected to reduce the fluctuation of power supply input, which is conducive to reducing the harmonic of the power grid. Finally, the parameter calculation and experimental simulation are carried out. The feasibility of this scheme is proved.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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