使用PIC16C781/782产生的高电压

TheNixietubeisadevicebornoutofthemiddle

twentiethcentury,usedtodisplaydigitalinformationina

humanreadableformat.Basically,itisahigh-voltage

numericaldisplay.Today,theNixietubehasbeen

replacedbymoreefficient,moredurable,andlongerlast-

ingdevices,suchasLEDdisplaysandLCDs.However,

forthistechnicalbrief,theNixietubeservesasan

excellentvisualfeedbackofthePIC16C782device’s

abilitytogeneratehighvoltagefromalow-voltage

source.

Thistechnicalbriefintroducestheboostconverter

topologyoperatinginDiscontinuousmode.Asan

example,asimple9Vto170VDC-DCconverteris

designedbasedonthistopology,andisusedtoprovide

powertoathree-digitNixietubedisplay.The

PIC16C782isusedtocontroltheDC-DCconverterand

providesdatadecodingforthedisplay.Tomakethe

displayuseful,thePICmicro

®

MCUsamplesa

temperaturesensoranddisplaystheresults.TB053GeneratingHighVoltageUsingthePIC16C781/782EQUATION1:Author:RossFoslerMicrochipTechnologyInc.diLVINVIN=L1→t=iLdtL1INTRODUCTIONTheNixietubeisadevicebornoutofthemiddleThepeakcurrentisachievedthemomentbeforeQ1twentiethcentury,usedtodisplaydigitalinformationinaturnsoff.Equati