Resource and Environmental Engineering College, Henan Polytechnic University
Guodian and Jiantou Inner Mongolia Energy Investment Co. , Ltd.

为了解决本安电源过流和短路的安全问题,设计了一种用于本质安全电源的新型保护电路。该电路通过电流镜电路按一定的比例复制主路电流,并由副电路采样电流信号,经过放大、移位处理后接入比较器负输入端,比较器正输入端接入短路检测信号。该新型电路的功能是当电源负载发生过流或短路故障时,滞回比较器输出过流或短路控制信号,迅速关断主电流开关,从而实现对负载主电路截断的保护;同时启动微电流开关,检测短路故障是否消除,使得故障消除后能够自动恢复主电流开关电路。此外,电源保护电路的软启动电路可用于解决电源启动过程中的浪涌电流可能会造成过流保护误动作的问题。

In order to address the safety issues of overcurrent and short circuit, a new type protection circuit is proposed for intrinsic safety power supplies. The circuit replicates the main circuit current by a certain proportion through a current mirror circuit, and samples the current signal through the secondary circuit. After amplification and offset processing, the signal is input to the negative input terminal of a comparator, while the positive input terminal is connected to the short-circuit detection signal. When the power supply load experiences overcurrent or short - circuit faults, the hysteresis comparator outputs an overcurrent or short-circuit control signal, quickly turning off the main current switch and thereby protecting the load from the main circuit. At the same time, the microcurrent switch is activated to detect whether the short - circuit fault has been eliminated, so that the main current switch circuit can automatically recover after the fault is eliminated. In addition, the soft start circuit of the power protection circuit is used to avoid false triggering of overcurrent protection caused by surge current during the power startup.

1 电路设计原理及实现
1.1 设计原理
1.2 电路实现及定性分析
2 软启动电路和多重保护电路设计
2.1 软启动电路设计
2.2 多重保护电路设计
3 仿真结果分析
4 结 语

邓佳楠, 郭庆瑞, 余 波, 等. 新型本质安全电源保护电路设计 [J]. 煤炭工程, 2024, 56(1): 21-25.