一种新型矿用本质安全型电源的设计

Design of a New Type of Mine-used Intrinsic Safety Power Supply

针对目前煤矿井下多输入电压等级本质安全型电源的笨重和单输入电压等级本质安全型电源的局限性问题,提出了一种新型本质安全型电源的设计方案。该新型本质安全型电源采用R型隔离变压器,体积小;采用高性能的DC/DC开关转换电源,提高了本质安全型电源的转换效率,且减小了输出纹波噪声;同时采用由过流检测芯片、单稳态触发芯片、大功率三极管等组成的双重化过流和过压保护电路,提高了本质安全型电源的可靠性。

In order to solve problems of bulkiness of intrinsic safety power supply with multi-level input voltage and limitation of the one with single-level input voltage in coal mine underground at present,the paper proposed a design scheme of a new type of intrinsic safety power supply.The intrinsic safety power supply uses R isolation transformer with small volume and DC/DC switching converter which improves the intrinsic safety power supply＇s converting efficiency and decreases the power supply＇s output ripple.Meanwhile,the intrinsic safety power supply uses dual-protection circuit of over-current and over-voltage composed of over-current detection chip,one-shot trigger chip,high-power transistors, etc,and the protection circuit improves the reliability of the intrinsic safety power supply.