论文部分内容阅读
现有非本安型网口电路未对输出和输入信号未进行过压保护和限流处理,当出现故障时产生的电火花或热效应可能点燃爆炸性危险气体而产生爆炸,不能直接应用到本安型网口电路中。针对此问题,对现有非本安型网口电路进行改进,采用不带变压器的网口、变压器芯片、限流电阻、过压保护等对输入输出信号进行限流限压等保护处理,达到本质安全信号输入输出要求,经过测试该电路在正常和故障状态下输出能量满足本安型电路的要求。
The existing non-intrinsically safe network port circuit does not over-voltage and current-limit the output and input signals. When a fault occurs, a spark or a thermal effect may ignite the explosive dangerous gas and cause an explosion, which can not be directly applied to the intrinsic safety Network interface circuit. In response to this problem, the current non-intrinsically safe network port circuit is improved, the network port without transformer, transformer chip, current limiting resistor, over-voltage protection and other input and output signals for current limiting and pressure protection protection process to achieve Intrinsically safe signal input and output requirements, after testing the circuit in normal and fault state output energy to meet the requirements of intrinsically safe circuits.