EET 450 – Advanced DigitalPower SuppliesSlide 3Slide 4Supply VoltagePortable PowerPower ConnectionsPowerPoint PresentationSlide 9Power ManagementEnergy StarPower ProtectionSurge SuppressionUPSOther ConsiderationsCasesOlder case StylesCurrent case stylesPower Supply ConnectorsDisk Drive Power ConnectorsSlide 21EET 450 – Advanced DigitalChapter 24PowerPower SuppliesPower conversionPerforms a voltage conversion from either 120vAC to desired or 12vDC to desired voltagesTechnologiesLinear•Not efficient – heat generatedSwitchingPower SuppliesPower requirementsSupplying adequate power (watts)•Total ~ 150-350 wattsSupply constant voltages•+ 5V•-5 V•+ 12V•- 12V•+3.3V (ATX)Power SuppliesDevice Power needsTable 24.1 •Floppy – 1.4 W•Video – 6.5 W•HD – 2.2W – 6.5 W•Memory 16.8 W/8M•System Board – 25 WSupply VoltageUS Standard – 115 V – 60 Hz100-240, 50/60 Hz is commonRegulated supplies for AC Fairly uncommon – complexRegulation is typically done by converting to DC, regulating, then converting back to ACPortable PowerBatteriesNiCadLithium IonNiMH – Smart Battery Notebook Power2-6 hoursPower ConnectionsStandard P/SD shaped device power connector•+5/+123.5” power connector•+5/+12Main Board Power Connector•See tables 24.3, 24.4Power ManagementStates of APMFull OnAPM Standby – memory poweredAPM Suspend - vegetableHibernation – allows restoration to memory/ program stateOff StateEnergy StarPC Monitor able to switch to a low power mode.< 30 watts after 15 to 30 minutesCombo of PC/monitor < 60 wattsPrinter based on PPMPower ProtectionIrregularitiesOvervoltage•SurgesUndervoltage•brownoutNoise•RFSurge SuppressionSinking energy spikes away from PCSacrificialMOVActiveZener DiodeUPSBattery SystemBackup Power SupplyRegulation and ‘clean’ outputwaveformTrue UPSContinuous powerSwitching powerComputer Interface (network)Other ConsiderationsPhone LinesStatic Electricity Network InterfaceCasesThe case dictates what can kind of power supply can be used.Older case StylesPC/XT – Small Power Supply (63 watts)AT Style DesktopTowerBaby AT form factorLPX StylePS2 StyleCurrent case stylesATX form factorPower Supply used in ATX and NLX systemsPower connector is substantially changedNLX style•Low profile ATXSFX styleMicro-ATX motherboardsPower Supply ConnectorsStandard M/B connector ATATXPower expansionY – cableATX Auxiliary and Optional connectorDisk Drive Power ConnectorsConventional driveD-shapedNew ‘3.5”’ connectorKeyed pin