煤矿作为保障我国能源安全供应的“压舱石”和“稳定器”，其安全生产与开采依然是国家重点关注的工作。由于煤矿井下、巷道内部的环境复杂难以预料，且充斥着瓦斯、甲烷、粉尘等危险可燃性气体，若操作不当，极易发生爆炸，对井下人员的生命安全造成了极大的威胁。而现有终端设备的功能多为井下视频监测、环境参数监测、危险情况预警等，无法满足如今井下应急救援对应急通信的要求，所以二次研究设计一款符合本质安全原理的，可在井下完成音视频通话以及实时回传前方救援指挥部的终端设备，该设备采用防爆的本质安全型内部电路及外壳构造，具有一定的实用意义。此设备的成功研发为井下应急通信救援工作提供了关键装备，也提高了井下应急救援的效率。

通过对终端系统的需求分析以及对比不同方案，结合防爆本安电路标准完成了终端设备整体设计方案的研究设计。终端设备主处理器采用高通出品的Snapdragon 800系列的MSM8974，课题矿用终端设备以模块化的设计思想进行研究设计。主要模块包括供电电源保护模块、视频采集通信模块、音频采集通信模块、显示模块和存储模块等。其中供电电源保护模块通过对过压过流保护技术的分析以及电源的电火花放电模型研究，采用了特殊的二级过压过流保护电路，在VCC端和GND端分别加入一个保护电路形成双重保护，提升了设备电源模块工作的安全性，保护电路中具有过压过流检测电路部分和自动恢复电路部分，为电源供电模块提供全面保护。在视频采集和显示模块，采集到的图像数据信息通过CSI接口传到D-PHY再到DSI接口，完成视频图像的采集到显示单元呈现的过程。音频信息采集模块采用SPK0415HM4H-B芯片，其高性能、低功耗的特点，使该模块完全符合本安的功率要求。储存单元利用了性价比较高的SDIN5D1-8G-L芯片，完成对本地数据信息的存储；系统提供HDMI接口、USB接口以及Wi-Fi接口，方便数据的上传、共享以及拉取。在设备外壳方面，利用SolidWorks2016软件对矿用终端设备的防爆外壳进行3D建模设计，保证了各功能模块之间的组装密封，系统按照本质安全技术标准设计，在PCB版图设计中，加入电磁兼容性设计，提升了设备电路的稳定性。

对已完成设计的矿用终端设备进行电气性能测试以及接入宽窄融合应急通信指挥系统的功能测试。测试结果表明，本课题设计的矿用本安型便携应急终端设备额定工作电压为8.6V，额定工作电流为2.0A，各功能模块电压均小于5.0V，满足低功耗、本质安全电路设计要求等电气性能。在设备功能方面，可清晰连续的采集传输音视频信息，实现了实时的音视频通话、视频共享、实时性传输以及本地存储等功能，最终将终端设备交至权威检测部门进行煤安认证，通过检测并取得相关证书。

As a ' ballast stone ' and ' stabilizer ' to ensure China 's energy security supply, the safe production and mining of coal mine is still the focus of national attention. Due to the complex and unpredictable environment inside the coal mine and the roadway, and filled with dangerous flammable gases such as gas, methane, dust, etc., if the operation is improper, it is easy to explode, which poses a great threat to the life safety of underground personnel. However, the functions of the existing terminal equipment are mostly underground video monitoring, environmental parameter monitoring, and early warning of dangerous conditions, which cannot meet the requirements of underground emergency rescue for emergency communication. Therefore, the secondary research and design of a terminal equipment that conforms to the principle of intrinsic safety, can complete audio and video calls in the underground and return to the front rescue headquarters in real time. The equipment adopts explosion-proof intrinsically safe internal circuit and shell structure, which has certain practical significance. The successful development of this equipment provides key equipment for underground emergency communication rescue work, and also improves the efficiency of underground emergency rescue.

Through the demand analysis of the terminal system and the comparison of different schemes, the research and design of the overall design scheme of the terminal equipment is completed in combination with the explosion-proof intrinsically safe circuit standard. The main processor of the terminal equipment adopts the MSM8974 of the Snapdragon 800 series produced by Qualcomm. The mine terminal equipment is studied and designed with the modular design idea. The main modules include power supply protection module, video acquisition communication module, audio acquisition communication module, display module and storage module. Through the analysis of over-voltage and over-current protection technology and the research of spark discharge model of power supply, the power supply protection module adopts a special two-stage over-voltage and over-current protection circuit. A protection circuit is added to the VCC end and the GND end to form a double protection, which improves the safety of the power supply module of the equipment. The protection circuit has an over-voltage and over-current detection circuit part and an automatic recovery circuit part, which provides comprehensive protection for the power supply module. In the video acquisition and display module, the image data information is transmitted through the CSI interface to the D-PHY and then to the DSI interface to complete the process of video image acquisition and display unit presentation. The audio information acquisition module uses the SPK0415HM4H-B chip. Its high performance and low power consumption make the module fully meet the intrinsically safe power requirements. The storage unit uses the cost-effective SDIN5D1-8G-L chip to complete the storage of local data information ; the system provides HDMI interface, USB interface and Wi-Fi interface to facilitate data uploading, sharing and pulling. In terms of equipment shell, SolidWorks2016 software is used to design the 3D modeling of the explosion-proof shell of the mine terminal equipment, which ensures the assembly and sealing between the functional modules. The system is designed according to the intrinsically safe technical standards. In the PCB layout design, the electromagnetic compatibility design is added to improve the stability of the equipment circuit.

The electrical performance test of the completed mine terminal equipment and the functional test of the access to the wide-narrow integration emergency communication command system are carried out. The test results show that the rated working voltage of the mine intrinsically safe portable emergency terminal equipment designed in this project is 8.6V, the rated working current is 2.0A, and the voltage of each functional module is less than 5.0V, which meets the requirements of low power consumption and intrinsically safe circuit design. In terms of equipment functions, it can clearly and continuously collect and transmit audio and video information, and realize real-time audio and video calls, video sharing, real-time transmission, local storage and other functions. Finally, the terminal equipment is handed over to the authoritative detection department for coal safety certification, and the relevant certificates are obtained through detection.