交流电源线接口

Thisapplicationnotedescribesasimplemethodfor

measuringparametersfromtheACpowerline.

Parameterssuchaszerocrossing,frequency,and

relativephasecanbemeasured.Thismethodisuseful

formeasurementson50,60,and400Hzpower

systemswithvoltagesuptoseveralhundredvolts.The

methodrequiresonlyoneexternalcomponent,a

resistor,andismorereliablethanpreviouslypublished

methodsusingcapacitorsorbulky,expensive

transformers.AN521InterfacingtoACPowerLinesFIGURE1:PIC16C5XSERIESINPUTAuthor:DougCoxPROTECTIONCIRCUITONI/OMicrochipTechnologyInc.PINSVDDINTRODUCTIONThisapplicationnotedescribesasimplemethodforPmeasuringparametersfromtheACpowerline.Parameterssuchaszerocrossing,frequency,and