分析了矿用调速器存在的安全问题,阐述了瓦斯检测和绝缘检测的原理,并给出了瓦斯信号的采样电路、绝缘阻值的CAN通信传送方式和系统的软件设计,为矿用调速器输入端设计了一套安全保护系统,通过控制接触器通断来实现矿用调速器主电路供断电控制。实验结果表明,设计的安全保护系统可以实现当达到瓦斯浓度或绝缘阻值危险范围时矿用调速器主电路立即断电,恢复正常后及时送电的功能。 The safety problems of mine governor are analyzed. The principle of gas detection and insulation test is expounded. The sampling circuit of gas signal, the communication mode of CAN resistance and the software design of the system are given. A set of safety protection system was designed on the input side of the speed governor to realize the main circuit of the mine governor for the power-off control by controlling the contactor on-off. The experimental results show that the designed safety protection system can realize the function of powering off the main circuit of mine governor immediately when it reaches the dangerous range of gas concentration or insulation resistance.