随着信息化矿山、数字化矿山的建设和发展，矿井下用电设备的数量和种类日益繁多，本安防爆电源的输出功率亟待提高。针对传统本安防爆电源输出功率较小、保护响应速度慢等问题，选题对基于Power-i技术的大功率本安防爆电源设计理论及本安性能测评方法进行研究，显著提升了本安防爆电源的保护动作速率与输出功率，对本安防爆电源的推广应用具有重要指导意义。

本文从本质安全电路展开研究，介绍了本质安全电路的放电类型和引燃理论，在此基础上，通过对Power-i技术进行深入分析，指出通过检测电流变化率，可快速检测和判断故障状况并及时切断火花能量来源，从而减少放电时间以抑制火花能量，采用Power-i技术可以进一步提高本安性能及电源的本安输出功率和动态响应速度。基于Power-i标准研究了大功率本安防爆电源的本安性能测评方法，采用电气参数、响应时间、评定系数和瞬态保护特性四项指标对大功率本安防爆电源的本安性能进行评判。根据本安性能指标的测评步骤，推导出测评各项指标对应的电流变化率表达式，据此提出了一种确保大功率本安防爆电源满足本安性能要求的设计方法。根据提出的设计方法，对大功率本安防爆电源的主电路和保护电路进行设计，阐述了主电路反激变换器在两种工作模式下的工作过程和基本关系式，据此分析得出反激变换器主功率回路中各器件的选型方法。为提高反激变换器工作稳定性，建立起反激变换器峰值电流控制下的小信号模型，并选择Ⅱ型反馈补偿电路进行环路补偿设计，得出环路补偿设计方法。设计了基于Power-i技术的保护电路，包括故障检测比较电路、单稳态触发器电路、软启动与快速关断驱动电路，同时给出保护电路中主要器件的参数设计方法。

根据Power-i标准研制了一款24V/2A的大功率本安防爆电源实验样机，对其关键电气性能进行测试验证，并采用大功率本安防爆电源本安性能评价装置完成对样机本安性能的测评，仿真和实验结果验证了理论分析的正确性和电路设计的可行性。

With the construction and development of information-based mines and digital mines, the number and types of electrical equipment under mines are becoming increasingly diverse, and the output power of intrinsically safe and explosion-proof power supplies needs to be improved. In view of the problems of traditional intrinsically safe and explosion-proof power supplies with small output power and slow protection response, the selected topic investigates the design theory and intrinsically safe performance measurement method of high-power intrinsically safe and explosion-proof power supplies based on Power-i technology, which significantly improves the protection action rate and output power of intrinsically safe and explosion-proof power supplies, and has important guiding significance for the promotion and application of intrinsically safe and explosion-proof power supplies.

This paper starts the research from intrinsically safe circuit, introduces the discharge type and ignition theory of intrinsically safe circuit, based on which, through in-depth analysis of Power-i technology, it is pointed out that by detecting the rate of change of current, the fault condition can be quickly detected and judged and the source of spark energy can be cut off in time, thus reducing the discharge time to suppress the spark energy, and the use of Power-i technology can further improve Intrinsically safe performance and the intrinsically safe output power and dynamic response speed of the power supply. Based on the Power-i standard, the intrinsically safe performance measurement method for high-power intrinsically safe explosion-proof power supplies is studied, and the intrinsically safe performance of high power intrinsically safe explosion-proof power supplies is evaluated using four indicators: electrical parameters, response time, rating factor, and transient protection characteristics. Based on the evaluation steps of the intrinsic safety performance indicators, an expression for the current rate of change of each indicator is derived, and a design method is proposed to ensure that the high-power intrinsically safe explosion-proof power supply meets the intrinsic safety performance requirements. According to the proposed design method, the main circuit and protection circuit of the high-power intrinsically safe explosion-proof power supply are designed, and the working process and basic relationship of the flyback converter in the main circuit under two operating modes are explained, according to which the selection method of each device in the main power circuit of the flyback converter is analyzed. In order to improve the operating stability of flyback converter, the small signal model of flyback converter under peak current control is established, and the type II feedback compensation circuit is selected for loop compensation design, and the loop compensation design method is derived. The protection circuit based on Power-i technology is designed, including fault detection and comparison circuit, monostable flip-flop circuit, soft-start and fast shutdown driving circuit, and the parameter design method of the main devices in the protection circuit is also given.

A 24V/2A high power intrinsically safe explosion-proof power supply experimental prototype was developed according to the Power-i standard, its key electrical performance was tested and verified, and the intrinsically safe performance evaluation device of the high power intrinsically safe explosion-proof power supply was used to complete the evaluation of the intrinsically safe performance of the prototype, the simulation and experimental results verified the correctness of the theoretical analysis and the feasibility of the circuit design.

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