随着应用于爆炸性开采环境的监控、通信电气设备日趋增多，对矿用本质安全开关电源的输出功率提出了更高的要求，为此，本文提出了一种输出附加LC滤波的大功率本安Buck变换器（以下简称LC-Buck），仅使用较小的电感和电容值便能实现本质安全，并提出一种基于最大输出功率的元件参数优化设计方法，对于研制大功率本安电源具有重要指导意义。
    本文通过深入研究LC-Buck变换器电路结构、工作原理、能量传输过程，得到其各工作模式下输出纹波电压及峰值电感电流表达式；为使得变换器电流应力低、输出纹波电压小且电感电流不出现倒灌，确定出最佳工作模式，并分析该模式下输出纹波电压及峰值电感电流与输入电压、负载电阻等参数间的变化关系；根据变换器不同开关状态及分断位置，探究了其最危险分断放电工况，并针对最危险工况，研究了变换器的分断放电特性；分析了变换器分断放电能量，并结合能量等效原理及简单电感电路临界点燃曲线，得出LC-Buck变换器的非爆炸性内部本安判据，基于此判据推导得出满足本安性能要求的最大电感；以电气性能指标最佳为依据，推导出最小电感和两级滤波储能元件最佳比例系数；分析指出，同时满足电气性能指标及本安要求的电感取值范围随负载取值的减小而变小，因此，定义电感最大值与最小值相等时所对应的负载电阻为其最小负载电阻，据此得出了LC-Buck变换器最大输出功率表达式；分析了现有变换器元件参数设计方法存在的问题，提出了基于最大输出功率和最佳工作模式的本安LC-Buck变换器优化设计方法，并给出不同条件下的参数设计流程。
    根据所得出的优化设计方法，研制了本安LC-Buck变换器试验样机，测试了其电气性能，并在IEC安全火花试验平台上进行爆炸性试验，结果验证了理论分析的正确性及优化设计方法的可行性。

    With the increasing number of monitoring and communication electrical equipment used in explosive mining environments, higher requirements are placed on the output power of mining intrinsically safe switching power supplies. Therefore, this paper proposes a high-power intrinsically safe output with additional LC filtering. Buck converters (hereinafter referred to as LC-Bucks) can achieve intrinsic safety by using only small inductance and capacitance values, and a method for optimizing the design of component parameters based on the maximum output power is proposed, which is of great importance for the development of high-power intrinsically safe power supplies.
    In this paper, through in-depth study of the circuit structure, working principle and energy transfer process of the LC-Buck converter, the expressions of the output ripple voltage and peak inductor current in each working mode are obtained. The inductor current is not back-flowed, the best working mode is determined, and the relationship between the output ripple voltage and peak inductor current and the input voltage, load resistance and other parameters in this mode is analyzed; according to the different switching states and breaking positions of the converter, explore The most dangerous breaking and discharging working condition is analyzed, and the breaking and discharging characteristics of the converter are studied on the premise of the most dangerous working condition; The non-explosive internal intrinsic safety criterion of the LC-Buck converter is derived. Based on this criterion, the maximum inductance that meets the requirements of intrinsic safety performance is derived. Based on the best electrical performance index, the minimum inductance and two-stage filter energy storage are derived. The best proportional coefficient of the component; the analysis points out that the inductance value range that meets the electrical performance indicators and intrinsic safety requirements at the same time decreases with the decrease of the load value. Therefore, define the corresponding load resistance when the maximum value and the minimum value of the inductance are equal. Based on the minimum load resistance, the expression of the maximum output power of the LC-Buck converter is obtained. The defects of the existing converter component parameter design methods are analyzed, and the intrinsic safety based on the maximum output power and the best working mode is proposed. The optimal design method of LC-Buck converter is given, and the parameter design process under different conditions is given.
    According to the optimal design method obtained, a test prototype of intrinsically safe LC-Buck converter was developed, and its electrical performance was tested. The explosion test was carried out on the IEC safety spark test platform. The results verified the correctness of the theoretical analysis and the optimal design method. feasibility.

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