两相交错并联磁集成Buck-Boost变换器本质安全特性研究

发布时间：2018-09-19 13:41

【摘要】：为煤矿井下、石油化工等易燃、易爆性环境供电的设备一定要考虑防爆的问题,本安型(本质安全型)开关电源也因此应运而生。传统矿用本安型开关变换器存在电气特性指标(如低电感电流纹波,低输出电压纹波,高功率及效率)要求大电感、大电容与本安特性要求小电感、小电容的矛盾以及普通单通道Buck-Boost变换器由于受本安性能的制约输出功率难以提高的问题。本文由此分析基于交错并联磁集成理论的本质安全型Buck-Boost变换器。根据所提出的等效电气电感和等效本安电感的定义,通过选择适当的耦合系数来提高等效电气电感并降低等效本安电感,从而使变换器满足电气性能和本安性能的要求,且提高了变换器的输出功率。首先分析了两相交错并联磁集成Buck-Boost变换器的工作原理、耦合系数与占空比的关系,得到满足本安特性与电气特性的最佳耦合系数。以输入电压、负载电阻为自变量,根据耦合电感的变化,推导出在不同工作模式下的耦合电感电流、输出纹波电压的变化规律并得出相应的极大值,用仿真加以验证；然后分别讨论两相交错并联磁集成Buck-Boost变换器输出短路时所释放的能量以及电感断开时所释放的能量,得出非爆炸本质安全(输出本安、内部本安)判据,并首次对本质安全型交错并联磁集成Buck-Boost变换器的无源元件进行优化设计；最后通过和普通单通道本安型变换器进行比较,得出两相交错并联磁集成本安型Buck-Boost变换器在电气性能和本安性能上均有显著的提高。理论分析用仿真与实验得以验证。
[Abstract]:For the coal mine underground, petrochemical and other flammable and explosive environment power supply equipment must consider the problem of explosion protection, and the intrinsically safe switching power supply came into being. In traditional mine intrinsic-safe switching converters, the electrical characteristics (such as low inductance current ripple, low output voltage ripple, high power and efficiency) require large inductance, large capacitance and low inductance with intrinsically safe characteristics. The contradiction of small capacitance and the difficulty of improving the output power of ordinary single channel Buck-Boost converter due to the limitation of intrinsic security performance. In this paper, the intrinsically safe Buck-Boost converter based on interleaving parallel magnetic integration theory is analyzed. According to the definitions of the equivalent electrical inductance and the equivalent intrinsically safe inductor, the equivalent electrical inductance and the equivalent intrinsically safe inductance can be improved and reduced by selecting the appropriate coupling coefficient, so that the converter can meet the requirements of the electrical performance and the intrinsically safe performance. The output power of the converter is improved. Firstly, the working principle of two-phase interleaved parallel magnetically integrated Buck-Boost converter and the relationship between the coupling coefficient and duty cycle are analyzed, and the optimum coupling coefficient satisfying the intrinsic and electrical characteristics is obtained. Taking input voltage and load resistance as independent variables, according to the variation of coupling inductance, the variation law of coupling inductor current and output ripple voltage under different working modes is deduced and the corresponding maximum is obtained, which is verified by simulation. Then the energy released by the two-phase interleaved parallel magnetically integrated Buck-Boost converter and the energy released by the inductor when the inductor is disconnected are discussed respectively, and the non-explosive intrinsic safety criterion is obtained. The passive components of the intrinsically safe interleaving parallel magnetically integrated Buck-Boost converter are optimized for the first time. It is shown that the electrical performance and the intrinsic safety performance of the two-phase interleaved parallel integrated intrinsically safe Buck-Boost converter are significantly improved. The theoretical analysis is verified by simulation and experiment.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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