Power Supplies Flashcards
(32 cards)
PC Power
AC to DC power
Power Supply connector
IEC-320 is the wall plug
Modern Voltage
Dual Voltage with a switch
IEC-320 Plug
3 holes - hot, neutral, ground
Hot wire carries voltage, pipe
Neutral carries no voltage, drain
Ground allows excess to safely ground
Testing AC Power
Use multimeter
Hot outputs 115v
Neutral 0v
Ground 0v
AC Adapters
Not interchangable
Check Voltage, Amperage, and Polarity
Multimeter Tests
Continuity
Resistance
AC Voltage (VAC)
DC Voltage (VDC)
Continuity
Can electrons flow from one end of wire to other
Resistance
Use if do not have continuity setting
Sag and Surge
Power fluctuations from power company
Can be brownout or blackout
Surge Suppressor
absorbs extra voltage
check joules rating, min 2000
UL LCC 1449 rating
UPS
Uninterruptible Power Supply
measured in Volt-Amps
comes in online, standby, and line interactive
Power Supply Voltages
AC
115/120V US
230V other
DC Voltages
3.3, 5, 12
Most Common Power Supply Size
150 x 140 x 86 mm
Component Voltage Uses
12v for HDD and OD
3.3 and 5 for onboard electronics
Motherboard connector
20 or 24 pin P1 power connector
Some have 4, 6, or 8 pin for extra power
Peripheral Power
Molex - 5V and 12V for fans and older drives, has chamfers
Mini - Berg connector, 5 and 12v to periphs - floppys
SATA - 15 pin connector, L Shape
Splitters and Adapters
Create more connections
ATX
Motherboard power and soft power
20 Pin P! plus molex or mini
Rails
Over-current protection for power supply connections to components
Single or multi-rail means one or multiple OCPs
Subtypes
ATX12V 1.3 added P4 extra 12v power, AUX connector 6 pin to supply 3.3 and 5v
EPS12V - server power supplies
APFC
Active Power Factor Correction
eliminates harmonics
Installing Power Supplies
Four standard screws
Always unplug an ATX system before doing work
Key or screwdriver short
Cooling
Power-supply fan
Pulls air into PC
Case fans
