数控可调不间断直流电源设计

发布时间：2018-01-24 06:16

本文关键词： 电能高频开关电源数控可调不间断直流电源功率因数校正软开关技术主备电源　出处：《安徽工程大学》2017年硕士论文　论文类型：学位论文

【摘要】：从电能第一次进入人类生活被使用开始,历史上每一步的发展都离不开电。社会的进步伴随着多样化的需求,为了满足不同场合的各种用电,高频开关电源应运而生。高频开关电源属于电能的转换装置,能将电能转换成任何电压等级和种类,因此可以广泛地用于各行各业,甚至航空航天等前沿科技领域。此外,随着社会的发展,一方面电子产品层出不穷,运用的场合也各不相同,这就导致了对电源性能要求的不断提高;另一方面公众对能源问题的重视程度日益提升,使得用电效率问题变得突出。而高频开关电源本身为了提升性能,必须依靠不断提升频率,降低元器件体积来实现。频率的提升使得单位时间内开关管的动作次数增多,这势必出现了更高的开关损耗。所以,在性能提升的同时兼顾用电效率,就必须在高频开关电源领域不断探索。研究新的拓扑,引入新的技术,发现新的材料,通过不断的优化设计,最终达到所有用户的要求。本论文的主要任务是设计数控可调不间断直流电源。该电源分为市网和和蓄电池两种输入方式,市网主电源从市网取电,主要经过AC-DC升压型功率因数校正电路、半桥LLC谐振电路、第二级降压电路。AC-DC升压型功率因数校正电路主要用于交流电的整流和电流波形的校正,该电路以NCP1654为控制芯片,输出稳压的385V直流电。半桥LLC谐振电路运用了软开关技术,主要起到了第一级降压作用。该电路以NCP1397为控制芯片,将前一块电路的输出电压降至48V。第二级降压电路为同步降压电路,在MC9S12主控板的直接控制下,完成对整个市网主电源的可调输出。蓄电池备用电源从电池中取电,用以保证市网或者市网主电源电路可能出现故障时,能够持续为负载供电。备用电源只经过了一个升降压电路(蓄电池供电电路),电路中升压和降压的控制分别用LM3478芯片和NCP1034芯片完成,而MC9S12主控板则主动给予NCP1034芯片FB引脚反馈信号,通过NCP1034芯片间接调控备用电源的输出电压。芯片供电电路主要的作用是对各电路的控制芯片和主控板芯片进行供电,而主备电源之间的切换输出则由芯片供电电路对控制芯片的选择供电来完成。MC9S12主控板以飞思卡尔单片机MC9S12为核心,完成对整个系统的保护、检测和输出电压的调整。设计中,首先针对数控可调不间断直流电源的原理进行了研究,在总体功能要求的前提下,从每块电路的拓扑结构选择入手,详细的完成了电路设计和元器件参数的计算。为了验证其合理性,随后又做出了 Matlab-Simulink仿真,最后按照之前的设计,研制出了完整的样机,并给出了部分测试结果与分析。
[Abstract]:From the first time the electric energy was used in human life, every step of the development of history can not be separated from electricity. The progress of society is accompanied by a variety of needs, in order to meet the various occasions of electricity. High frequency switching power supply arises at the historic moment. High frequency switching power supply belongs to the power conversion device, which can convert the power into any voltage grade and type, so it can be widely used in various industries. In addition, with the development of society, on the one hand, electronic products emerge in endlessly, the use of the occasions are also different, which leads to the continuous improvement of power performance requirements; On the other hand, the public pay more and more attention to the energy problem, which makes the problem of power efficiency become prominent. In order to improve the performance of high frequency switching power supply, it has to rely on increasing frequency. To reduce the volume of components to achieve. The frequency of the increase in the number of times in the unit time switch, which is bound to appear a higher switching loss. Therefore, in the performance of the improvement while taking into account the efficiency of the use of electricity. It is necessary to explore new topology, introduce new technology, find new materials and optimize design in the field of high frequency switching power supply. The main task of this paper is to design the NC adjustable uninterruptible DC power supply, which is divided into two input modes: municipal network and battery. Mainly through AC-DC boost power factor correction circuit, half-bridge LLC resonant circuit. The second stage step-down circuit. AC-DC boost power factor correction circuit is mainly used for AC rectifier and current waveform correction. The circuit uses NCP1654 as the control chip. The output voltage is 385V DC. The half-bridge LLC resonant circuit uses soft switching technology, which plays the first stage of voltage reduction. The circuit uses NCP1397 as the control chip. The output voltage of the former circuit is reduced to 48 V. the second stage is a synchronous step-down circuit under the direct control of the MC9S12 main control board. The adjustable output of the main power supply of the whole city network is completed. The battery reserve power is taken from the battery to ensure that the main power supply circuit of the market network or the city network may fail. The power supply can be continuously supplied to the load. The backup power supply is only passed through a voltage up and down circuit (battery power supply circuit), in which the boost and step-down control are accomplished by the LM3478 chip and the NCP1034 chip, respectively. The MC9S12 main control board gives the feedback signal of the FB pin of the NCP1034 chip actively. The output voltage of standby power supply is indirectly regulated by NCP1034 chip. The main function of chip power supply circuit is to supply power to the control chip and main control board chip of each circuit. The switching output between the main and standby power supply is completed by the chip power supply circuit to select the control chip to complete. MC9S12 main control board with Freescale single chip microcomputer MC9S12 as the core. Complete the protection of the whole system, detection and output voltage adjustment. In the design, the principle of NC adjustable uninterruptible DC power supply is studied, under the premise of the overall functional requirements. Starting with the topology selection of each circuit, the design of the circuit and the calculation of the component parameters are completed in detail. In order to verify the rationality of the circuit, the Matlab-Simulink simulation is made. Finally, according to the previous design, a complete prototype is developed, and some test results and analysis are given.
【学位授予单位】：安徽工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86

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