好文推荐基于故障电流变化率的大功率本安电源设计

【能源人都在看，点击右上角加'存眷'】

可浏览全文

原文颁发在《工矿主动化》2021年第2期，迎接品读。

煤矿井下存在年夜量易燃易爆的混合物，这就要求本安电源正常事情或产生故障时所发生的电火花或热效应均不克不及导致爆炸。跟着煤矿井下电气装备主动化水平越来越高，井下安装的各类监测、节制、通讯体系及装备越来越多，使得小功率本安电源不克不及满意现实临盆需求。是以，在保证本色平安的条件下，最年夜水平地进步本安电源输出功率，是本安电源成长的紧张分支。针对现有本安电源存在的输出功率小、掩护后果差、动态相应速率慢等问题，本文设计了一种基于故障电流变化率的年夜功率本安电源，经由过程检测本安电源产生短路故障后的电流变化率，加速本安电源掩护电路的掩护速率，晋升电源的本色平安机能。

基于本安电源等效模子，阐发得出本安电源短路故障特征：短路初始阶段火花放电电流敏捷上升，电流变化率会产生突变。经由过程检测短路故障后电路中故障电流变化率的值，可以提前预知故障状况，在故障电流到达传统掩护电流所设置的掩护阈值之前便可以触发掩护功效，并在短路故障的初始阶段堵截输出回路。

本安电源等效模子

年夜功率本安电源由开关电源和本安掩护电路2个部门构成。开关电源部门经由过程电流节制型脉宽调制芯片UC3842节制MOSFET开关管的开通与关断光阴比，保证输入电压在90～265 V之间变化时，维持稳固的直流输出。本安掩护电路基于故障电流变化率来限定火花放电的能量。

年夜功率本安电源总体计划

引用格局

康骞,许春雨,田慕琴，等.基于故障电流变化率的年夜功率本安电源设计［J］.工矿主动化，2021,47（2）：6-12.

KANG Qian,XU Chunyu,TIAN Muqin,et al.Design of high-power intrinsically safe power supply based on fault current change rate［J］.Industry and Mine Automation，2021,47（2）：6-12.

作者接洽方式

康骞（1994-），男，山西太原人，硕士研讨生，主要研讨偏向为矿用本安电源与电力电子技术，E-mail：kangqian1208@163.com。

责任编纂接洽方式

胡娴，E-mail: huxian@cari.com.cn

基于故障电流变化率的年夜功率本安电源设计

Design of high-power intrinsically safe power supply based on fault current change rate

【作者】康骞1,2,许春雨1,2,田慕琴1,2,宋建成1,2
【Author】KANG Qian1,2,XU Chunyu1,2,TIAN Muqin1,2,SONG Jiancheng1,2
【作者机构】1.太原理工年夜学 矿用智能电器技术国度处所结合工程试验室, 山西 太原030024; 2.太原理工年夜学 煤矿电气装备与智能节制山西省重点试验室， 山西 太原030024
【Unit】1.National & Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology, Taiyuan University of Technology, Taiyuan 030024, China; 2.Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control, Taiyuan University of Technology, Taiyuan 030024, China

【择要】针对现有本安电源存在的输出功率小、掩护后果差、动态相应速率慢等问题，设计了一种基于故障电流变化率的年夜功率本安电源。将本安电源等效为电势电容(EC)电路，阐发了EC电路短路故障特征：短路初始阶段火花放电电流敏捷上升，电流变化率会产生突变。经由过程检测短路故障后电路中故障电流变化率的值，可以提前预知故障状况，在故障电流到达传统电流掩护办法所设置的掩护阈值之前便触发掩护功效，并在短路故障的初始阶段堵截输出回路，进步本安电源的输出功率。年夜功率本安电源包含开关电源和本安掩护电路2个部门：开关电源采纳反激变换布局，其节制电路以UC3842为焦点，反馈电路以光耦与三端稳压器TL431为焦点；本安掩护电路基于故障电流变化率来限定火花放电的能量，主要包含故障检测电路、比拟电路、自规复电路、软启动电路、驱动电路。本安电源样机机能测试成果注解，交流输入电压在90～265 V颠簸时，本安电源功率因数不小于0.96，输出直流电压纹波在20 mV以内，电源效力在85%以上。短路试验成果注解，本安电源在产生短路故障后的瞬态输出能量为65 μJ，满意设计要求。
【Abstract】In order to solve the problems of low output power, poor protection effect, and slow dynamic response speed of existing intrinsically safe power supply, a high-power intrinsically safe power supply based on fault current change rate is designed. The intrinsically safe power supply is equivalent to an EC circuit, and the short-circuit fault characteristics of the EC circuit are analyzed as follows: the spark discharge current rises rapidly at the initial stage of the short-circuit, and the current change rate changes suddenly. By detecting the value of change rate of the fault current in the circuit after a short-circuit fault, it is able to predict the fault state in advance, trigger the protection function before the fault current reaching the protection threshold set by the conventional current protection method, and cut off the output circuit at the initial stage of the short-circuit fault so as to increase the output power of the intrinsically safe power supply. The high power intrinsically safe power supply includes 2 parts: the switching power supply and the intrinsically safe protection circuit. The switching power supply adopts flyback converter structure. The core of the control circuit is UC3842, and the core of the feedback circuit is optocoupler and three-terminal regulator TL431. The intrinsically safe protection circuit limits the energy of spark discharge according to the change rate of the fault current, and mainly includes a fault detection circuit, a comparison circuit, a self-recovery circuit, a soft start circuit and a drive circuit. The performance test results of the intrinsically safe power supply prototype show that the power factor of the intrinsically safe power supply is not less than 0.96 when the AC input voltage fluctuating in the range of 90 to 265 V, the output DC voltage ripple is within 20 mV, and the efficiency of the power supply is above 85%. The short-circuit test results show that the transient output energy of the intrinsically safe power supply after a short-circuit fault is 65 μJ, which meets the design requirements.

【症结词】年夜功率本安电源；故障电流变化率；电势电容；开关电源；本安掩护电路；反激变换；EC电路
【Key words】high-power intrinsically safe power supply; fault current change rate; potential capacitance; switching power supply; intrinsically safe protection circuit; flyback converter; EC circuit

【基金项目】国度天然科学基金资助项目（51577123）

信息提供：胡娴 图文编纂：张聚

审 核：王晖

免责声明：以上内容转载自工矿主动化，所发内容不代表本平台态度。
全国能源信息平台接洽德律风：010-65367702，邮箱：hz@people-energy.com.cn，地址：北京市旭日区金台西路2号人平易近日报社