Vector VEC550POB Dokumentacja Pobierz pdf (Strona 5)

THEORY OFOPERATION

Theinverterchanges12VDCinto120VAC(120VACRMS),electricalpower .This

isaccomplishedintwostages.Thefirststageraisesthe12VDCinputto145VDC

throughmodernhigh-frequencyconversiontechniques.Theoutputstagechanges

the145-VDCto120VAC.Theinverter'soutputstageusesmultiplebanksofmetal-

oxide semiconductor field-effect transistors (MOSFETs) to alternately apply

oppositepolarity to theAC outlet'sHOT and NEUTRAL terminals.TheACoutput

approximatesasinewaveinshape.ThisiscalledModifiedSineWave(MSW)and

it has the same energy characteristics as the sine wave of commercial electrical

power.

FIGURE3-SINEWA VEANDMSWCOMPARISON

NOTE:

A TRUERMSvoltmetermustbeusedformeasuringMSW .Iftheoutputof

the inverter is measured using standard digital or analog voltmeters, these

instrumentsmaynotcorrectlyreadthevoltage.Theytypicallywillreadfrom10to

20voltslow.

ACAPPLIANCECAUTIONS:

DONOT plugsmallappliancesintotheinverterreceptaclestodirectlyrechargetheir

nickel-cadmiumbatteries.Alwaysusetherechargerprovidedwiththatappliance.

DoNOT plug inbattery chargers forcordless power toolsif the chargercarries a

warningthatdangerousvoltagesarepresentatthebatteryterminals.

Not all fluorescent lamps operate properly

 with this type of inverter. If the bulb

appearstobetoobright,orfailstolight,donotusethelampwiththisinverter.

Fans with synchronous motors may slightly increase in speed (RPM) when

poweredbytheinverter.Thisisnotharmfultothefanortotheinverter.

Certainchargersforsmallnickel-cadmiumbatteriescanbedamagedifpluggedinto

theinverters.Inparticular,twotypesofappliancesaresusceptibletodamage:

•Small,battery-operatedappliancessuchasflashlights,cordlessrazors

andtoothbrushesthatcanbepluggeddirectlyintoanACreceptacle

torecharge

•Certainbatterychargersforbatterypacksthatareusedinsomecordless

hand-tools.Chargersforthesetoolshaveawarninglabelstatingthat

dangerousvoltagesarepresentatthebatteryterminals

110/120V AC

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Vector VEC550POB Dokumentacja Strona 5