一种基于FPGA的宽范围绝缘测试系统设计与研究OACSTPCD

In response to the increasing demand for insulation testing in the industrial field,a wide range insulation testing system based on FPGA is proposed.At the same time,in response to the impact of power frequency interference on testing accuracy in high resistance testing,a method using dual T-notch filters is proposed.Firstly,analyze the testing principle of the insulation testing platform and pro-vide the overall design framework of the system.The insulation testing platform is divided into two parts:the upper computer and the lower computer,which communicate through Ethernet.Secondly,analyze the circuit principle and propose corresponding hardware design based on the principle and testing requirements.The notch filter adopts a dual T structure,and the resistance testing principle adopts a two wire method,design software and communication protocols based on circuit and testing principles.Finally,the circuit is simulated and tested in physical form.The test results show that the insulation testing system can cover a testing range of 10 Ω～10 MΩ,and the dual T notch filter can filter out power frequency interference in the case of high resistance testing.The test errors after filtering are all within 10％.