良好接地不如简单隔离？

良好接地不如简单隔离？TexasInstrumentsIncorporatedInterface(DataTransmission)Whengoodgroundsturnbad―isolate!ByThomasKugelstadtSeniorApplicationsEngineerIndustrialcommunicationviafieldbus-transceiversystemsconvertingthelinevoltageintotherequiredDCoutput.oftenrequireslongtransmissionlines.Designers,unawareFigure1showsasimplifiedblockdiagramofalow-costofthelargeground-potentialdifferences(GPDs)betweenswitched-modepowersupply(SMPS)typicallyusedinremotebuslocations,eitherrelyonthelocalearthgroundpersonalcomputers,laserprinters,andotherequipment.asareliablesignalreturnpathor