变频器辅助开关电源的研究与设计

发布时间：2018-06-26 02:03

本文选题：变频器 + 开关电源　；参考：《西安科技大学》2017年硕士论文

【摘要】：现代电力电子技术作为一门不断成熟的学科发展到现在,变频器通过改变电机工作频率方式来控制电机的电力设备。变频器主要由整流(交流变直流)、滤波、逆变(直流变交流)、制动单元、驱动单元、检测单元微处理单元等组成。开关电源作为电力电子器件重要的分支,也为现代科学和社会生活提供能源需求,通过PWM的控制和开关管的开通和关断来稳定输出电压。开关电源为变频器的控制电路和驱动电路供电。开关电源的性能直接影响着变频器的工作质量。本课题基于变频器的工作原理和各部分的结构设计,为变频器的供电设计了一种多路输出的反激式开关电源,其中输入电压为200VDC～750VDC,四路输出分别是24V、1A,+15V、2A,-15V、1A,+5V、3A。论文讲述了变频器的背景意义和其性能要求,开关电源的拓扑结构和工作原理,通过分析选择合理的拓扑结构,并通过开关电源的硬件设计,包括各个部分的电路设计、器件选型、变压器设计,原理图的设计、PCB板的制作,进而是实物的形成;本课题应用的控制芯片UC3845给开关电源提供很好的驱动能力,采用电流型双闭环控制控制系统,并采用反馈回路方法来稳定输出电压,最终给变频器提供优质的电能。经过多次实验和反复补充修改设计,最终制成了具有较高性能指标的变频器辅助开关电源样机。实验测试结果表明:所设计的开关电源具有优良的稳压性能,以及输出电压纹波小、负载调整率和电压调整率比较精确,并且能够为变频器提供良好的电能。然后是开关电源的实验与调试,输出波形的分析,通过开关电源的效率、纹波大小等数据来验证电源的性能以及工作的可行性。
[Abstract]:Modern power electronics technology has been developed as a mature subject. Frequency converters control motor power equipment by changing the working frequency of the motor. Frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC AC), braking unit, drive unit, micro processing unit of detection unit and so on. Switching power supply, as an important branch of power electronic devices, also provides energy demand for modern science and social life. The output voltage is stabilized by PWM control and switch on and off. The switching power supply supplies power to the control circuit and drive circuit of the converter. The performance of switching power supply directly affects the working quality of inverter. Based on the working principle of inverter and the structure design of each part, a kind of flyback switching power supply with multiple output is designed for the power supply of the inverter. The input voltage is 200VDC / 750VDCA, and the four-way output is 24V / 1A, 15V / 2A / 15V / 1A and 5V / 3A respectively. The paper describes the background significance and performance requirements of the converter, the topology structure and working principle of the switching power supply, through the analysis and selection of reasonable topology structure, and through the hardware design of the switching power supply, including the circuit design of each part. Device selection, transformer design, schematic design, PCB board production, and then the formation of physical objects. The control chip UC3845, which is applied in this subject, provides a good driving capability for the switching power supply, and adopts a current-mode double closed-loop control system. The feedback loop method is used to stabilize the output voltage and provide high quality electric energy to the inverter. After many experiments and repeated modification, the inverter auxiliary switching power supply prototype with high performance index is made. The experimental results show that the designed switching power supply has good voltage stabilizing performance, small output voltage ripple, accurate load adjustment rate and voltage adjustment rate, and can provide good power for inverter. Then the experiment and debugging of the switching power supply, the analysis of the output waveform, the efficiency of the switching power supply, the ripple size and other data to verify the performance of the power supply and the feasibility of the work.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86

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