eet 450 – advanced digital chapter 24 power. power supplies power conversion performs a voltage...
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![Page 1: EET 450 – Advanced Digital Chapter 24 Power. Power Supplies Power conversion Performs a voltage conversion from either 120vAC to desired or 12vDC to desired](https://reader035.vdocument.in/reader035/viewer/2022062407/56649d395503460f94a134ed/html5/thumbnails/1.jpg)
EET 450 – Advanced Digital
Chapter 24Power
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Power Supplies Power conversion
Performs a voltage conversion from either 120vAC to desired or 12vDC to desired voltages
Technologies Linear
• Not efficient – heat generated Switching
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Power Supplies Power requirements
Supplying adequate power (watts)• Total ~ 150-350 watts
Supply constant voltages• + 5V• -5 V• + 12V• - 12V• +3.3V (ATX)
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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 W
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Supply 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 AC
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Portable Power Batteries
NiCad Lithium Ion NiMH – Smart Battery
Notebook Power 2-6 hours
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Power 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, 24.4
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Power Management States of APM
Full On APM Standby – memory powered APM Suspend - vegetable Hibernation – allows restoration to
memory/ program state Off State
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Energy 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 PPM
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Power Protection Irregularities
Overvoltage• Surges
Undervoltage• brownout
Noise• RF
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Surge Suppression Sinking energy spikes away from PC Sacrificial
MOV Active
Zener Diode
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UPS Battery System Backup Power Supply
Regulation and ‘clean’ output waveform
True UPS Continuous power Switching power Computer Interface (network)
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Other Considerations Phone Lines Static Electricity Network Interface
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Cases The case dictates what can kind of
power supply can be used.
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Older case Styles PC/XT –
Small Power Supply (63 watts) AT Style
Desktop Tower Baby AT form factor
LPX Style PS2 Style
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Current 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 motherboards
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Power Supply Connectors Standard M/B connector
AT ATX
Power expansion Y – cable
ATX Auxiliary and Optional connector
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Disk Drive Power Connectors Conventional drive
D-shaped New ‘3.5”’ connector
Keyed pin connector
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