抗直通短路的高可靠性电源拓扑及控制方式的研究

发布时间：2018-06-08 21:43

本文选题：航天电源 + 抗直通短路　；参考：《燕山大学》2015年硕士论文

【摘要】：航天电源在航天器中扮演着不可替代的作用,由于空间环境的特殊性以及电源的不可维修性,给航天电源的研制带来很大的难度。随着航天技术不断发展,航天器在适用于高压输入、大功率、高可靠、高精度等方面对电源的研制提出了更高的要求。本文在此背景下,研究设计了抗桥臂直通的高可靠拓扑结构以及新型磁反馈技术。本文首先对抗直通功率变换基本单元P-Cell和N-Cell进行分析,并根据功率流重构的思想,构成具有抗桥臂直通的高可靠拓扑结构,通过对不同拓扑结构特性的对比分析,确定半桥推挽结构作为变换器的主拓扑并深入研究了主拓扑的工作原理。确定主控芯片为TI公司的PWM斩波控制芯片UC3825。电源工作模式为恒压模式,采用峰值电流控制方式,以及射极跟随型斜坡补偿电路消除次谐波振荡,同时设计了浪涌抑制电路,共模抑制电路,隔离驱动电路。为消除一次侧与二次侧交叉耦合的影响,原副边要进行电气隔离,本文通过磁反馈实现输出电压的调节,本文研究了三种磁反馈方案,对不同结构进行对比分析,采用了正激磁反馈方式,完成磁反馈等效小信号模型以及硬件设计。完成电源整体方案设计,硬件参数设计和器件的选取,并对主功率级电路进行小信号建模,研究设计峰值电流控制模式下系统的小信号模型,设计电压外环调节器,对整个系统的稳定性进行仿真和分析。完成实验样机的制作、调试,测试其工作指标。实验样机的测试结果满足模块电源预期设计的稳态和动态指标。额定输入下,半载效率达到89.8%,满载效率为88.7%。本文给出了主要的实验波形并进行了分析,验证了主电路和反馈控制设计方案的可行性,为航天电源技术提供了技术参考。
[Abstract]:Space power plays an irreplaceable role in spacecraft. Because of the particularity of space environment and the maintainability of power supply, it is very difficult to develop space power source. With the continuous development of spaceflight technology, the spacecraft has put forward higher requirements for the development of power supply in the aspects of high voltage input, high power, high reliability and high precision. In this context, a high reliable topology and a new magnetic feedback technique are designed. In this paper, first of all, P-Cell and N-Cell, the basic units of direct power transformation, are analyzed. According to the idea of power flow reconstruction, a highly reliable topology with resistance to the straight through of the bridge arm is constructed. The characteristics of different topology structures are compared and analyzed. The half-bridge push-pull structure is determined as the main topology of the converter and the working principle of the main topology is studied. Determine that the main control chip is TI PWM chopper control chip UC3825. The mode of power supply is constant voltage mode, which adopts peak current control mode and emitter follower slope compensation circuit to eliminate subharmonic oscillation. At the same time, surge suppression circuit, common-mode suppression circuit and isolation drive circuit are designed. In order to eliminate the influence of cross coupling between primary side and secondary side, the primary and secondary sides should be electrically isolated. In this paper, the output voltage is adjusted by magnetic feedback. In this paper, three magnetic feedback schemes are studied, and the different structures are compared and analyzed. The equivalent small signal model of magnetic feedback and hardware design are completed by positive excitation feedback. Complete the overall scheme design of power supply, hardware parameter design and device selection, and model the main power level circuit with small signal, study and design the small signal model of the system under the peak current control mode, design the voltage outer loop regulator. The stability of the whole system is simulated and analyzed. Complete the manufacture, debugging and testing of the experimental prototype. The test results of the experimental prototype meet the steady and dynamic indexes of the expected design of the module power supply. Under rated input, the half load efficiency is 89. 8 and the full load efficiency is 88. 7. In this paper, the main experimental waveforms are given and analyzed, and the feasibility of the main circuit and the feedback control scheme is verified, which provides a technical reference for the aerospace power supply technology.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V442

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