随着“智慧矿山”发展概念的提出与普及，数字信息化设备被大量应用于煤矿井下，对安全可靠、性能优越的本质安全开关电源的需求也更加紧迫。因此探究并得出开关电源内部分断引燃能力评价及设计优化方法，将进一步促进本安开关电源在煤矿井下等爆炸性环境中的应用与推广。

以Buck-Boost变换器为研究对象，深入分析其稳态运行时的工作模态与电气特性，推导出Buck-Boost变换器不同模态下电感峰值电流与输出纹波电压表达式。探究Buck-Boost变换器内部分断故障的最危险工况并建立其等效电路模型，通过IEC火花试验装置对该等效电路进行分断放电试验，发现电弧电压极限值随电感的增大而增大，电弧放电时间随分断初始电流与电感的增大而增大；对电极分断速度与电弧放电时间建模分析发现，电弧放电时间随电极分断速度增大而减小，并最终趋于稳定值。基于电感分断初始电流、电弧电压极限值等放电参数，推导出可描述电感分断放电引燃能力的临界引燃功率与临界引燃能量的数学表达式，得出简单电感电路分断放电引燃能力评价方法；结合Buck-Boost变换器的最危险工况等效电路，得出其内部引燃能力评价方法，发现仅当电弧功率极限值与电感储能分别小于对应临界引燃值时，该电路不具有引燃爆炸性气体的能力。结合此引燃能力评价方法与Buck-Boost变换器电气特性，提出了内部本质安全Buck-Boost变换器设计方法，得到同时满足变换器电气性能与内部本安要求的电感、电容及开关频率设计范围。为保证变换器工作于最危险工况时满足内部本安性能的输入电压范围最大，进一步提出了内部本质安全Buck-Boost变换器储能电感优化方法。

根据给定指标与所提出的设计优化方法，研制内部本质安全Buck-Boost变换器样机。对比分析所提出的引燃能力评价方法、能量判别式、功率判别式与爆炸性试验评价结果，验证了所提出的引燃能力评价方法及内部本质安全Buck-Boost变换器设计优化方法的可行性、可靠性与良好适用性。

With the proposal of "smart mines", digital information electrical equipment is widely used in coal mines. The demand for safe, reliable, and superior performance intrinsically safe switching power supplies is also more urgent. Therefore, obtaining the inductor-disconnected discharge (IDD) ignition capability criterion and the optimal design method of the switching power supply will further promote the application of the intrinsically safe switching power supply in explosive environments such as coal mines.

The Buck-Boost converter is selected as the research object in the thesis, its working modes and electrical characteristics during operation are deeply analyzed. The expressions of inductance peak current and output ripple voltage in different modes are derived. The most dangerous IDD condition of the Buck-Boost converter is obtained, and its equivalent circuit model is established. The IDD behavior of the Buck-Boost converter is studied based on the International Electrotechnical Commission (IEC) spark test apparatus. It is found that the maximum arc voltage increase with the increase of the inductance, the arc discharge time increase with the increase of the initial arc current and inductance. By modeling the electrode disconnected speed and arc discharge time, it is found that the arc discharge time decreases with the increase of the electrode disconnected speed, and finally tends to a stable value. According to the discharge parameters such as the initial arc current and the maximum arc voltage, the expressions of the critical ignition power and the critical ignition energy can describe the ignition capability of the inductive breaking discharge are derived. The IDD ignition capability criterion of the simple inductive circuit is obtained. Combined with the most dangerous IDD condition equivalent circuit, the IDD ignition capability criterion of the Buck-Boost converter is obtained. The converter meets the demands of inner intrinsic safety performance only when the maximum arc power is less than the critical ignition power and the inductive energy is less than its critical value. By incorporating the proposed criterion and the electrical characteristics of the Buck-Boost converter, the design method for inner intrinsically safe Buck-Boost converters is obtained. The design range of inductance, capacitance and switching frequency that meets the demands of electric and inner intrinsic safety performance can be obtained based on the proposed design method. The optimal method for inner intrinsically safe Buck-Boost converters is proposed. After optimization, the converter will have the maximum input voltage safety margin of inner intrinsic safety performance in the most dangerous IDD conditions.

According to the system and component parameters, the inner intrinsically safe Buck-Boost converter prototype is made by the proposed optimal design method. The proposed criterion is compared with the electric energy criterion, electric power criterion, and explosive test criterion. The feasibility, reliability, and applicability of the proposed criterion and optimal design method are verified.

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