05. power supply unit (psu)

7/27/2019 05. Power Supply Unit (PSU)

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Copyright 2007 Heathkit Company, Inc. All Rights Reserved

PC Fundamentals

Power Supply Unit

+more


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Power Supply Unit

AKA:

PSU

Power Supply

Power Unit


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3

Power Supply Types

Linear Power Supply

Switched-Mode Power Supply (SMPS)

o More:o http://en.wikipedia.org/wiki/Switched-mode_power_supply

Pros. Cons. and Comparisono http://en.wikipedia.org/wiki/Switched-

mode_power_supply#Advantages_and_disadvantages
http://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supplyhttp://en.wikipedia.org/wiki/Switched-mode_power_supply


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The Power Supply.


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The Power Supply

FAN

AC Receptacle

On/Off Switch


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Power Supply Input Voltage

100 to 125 VAC @ 60 Hz

200 to 250VAC @ 50 Hz


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Motherboard Form Factors

AT-Type

ATX-Type


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AT Motherboard

12

13.5


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ATXMotherboard

9.6

12


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ATXMother-

board


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AT Power Distr ibution


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Power Supply Output Voltages

AT-Type

+5 Volts

+12 Volts

12 Volts

5 Volts


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Power Connector


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P9P8

Black

Wires

Motherboard Power Connectors


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Some connectors are held in place

by a latch.

Latch


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P9

GroundGround

+5V+5V

+5V-5V


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P8

-12V+12V

Ground

Ground+5V

Power Good


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ATX Power Distr ibution


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Power Supply Output Voltages

ATX-Type

+5 Volts

+12 Volts

12 Volts

5 Volts

+3.3 Volts


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ATX Motherboard

Power Connector


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20-Pin Power

Connector


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24-Pin Power

Connector


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2 X 10 ATX Connector

2 X 2

Connector


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Edge View of Motherboard.


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A Second 2 X 2

Motherboard PowerConnector Supplies

Processor Core Power(+12 Volts)


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The Power Good Signal

+5 Volt signal generated by the powersupply.

It indicates that the power supply has

passed its self test and that its outputvoltages have stabilized.

Usually occurs within first 0.5 seconds.

Prevents the system from running under

bad or unstable power conditions.


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Large Molex Connector


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+5V

+12V

Ground

4-Pin MolexConnector


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Berg Connector


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+5V

+12V

Ground

4-Pin Berg

Connector


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Grasp the

connectorby the

shell

Never by

the leads.


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Power Management

Hardware Power Management

Software Power Management


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Advanced Power Management (APM)

Eenables the operating systemto work withthe BIOSto achieve power management.

Replaced by ACPI

Microsoft dropped support for APM in

Windows Vista

More:

http://en.wikipedia.org/wiki/Advanced_power_management
http://en.wikipedia.org/wiki/Advanced_power_managementhttp://en.wikipedia.org/wiki/Advanced_power_managementhttp://en.wikipedia.org/wiki/Advanced_power_managementhttp://en.wikipedia.org/wiki/Advanced_power_management


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Advanced Configuration and Power

Interface (ACPI)

Successor of APM

An open standard for device configuration and power

management by the operating system

ACPI defines platform-independent interfaces forhardware discovery, configuration, power management

and monitoring.

The specification is central to Operating System-directed

configuration and Power Management (OSPM), a

system implementing ACPI, which removes device

management responsibilities from legacy firmware

interfaces


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APM vs. ACPI

APM vs. ACPI

http://www.thinkwiki.org/wiki/APM_vs._ACPI

Difference Between APM and ACPI

ACPIhttp://www.differencebetween.net/technology/software-

technology/difference-between-apm-and-acpi/

ACPIhttp://en.wikipedia.org/wiki/Advanced_Configuration_and_

Power_Interface
http://www.thinkwiki.org/wiki/APM_vs._ACPIhttp://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.differencebetween.net/technology/software-technology/difference-between-apm-and-acpi/http://www.thinkwiki.org/wiki/APM_vs._ACPIhttp://www.thinkwiki.org/wiki/APM_vs._ACPIhttp://www.thinkwiki.org/wiki/APM_vs._ACPI


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Power Saving Modes

Blank (Black) Screen Saver

Display Off

Sleep

Hibernate

Power Stateshttp://en.wikipedia.org/wiki/Advanced_Configuration_and_

Power_Interface#Power_states

Hybrid Sleep
http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interfacehttp://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface


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Blank Screen Saver


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Display Off and Sleep


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Hybrid Sleep

http://en.wikipedia.org/wiki/Sleep_mode#Hybrid_sleep

Sleep and Hibernation: FAQ

http://windows.microsoft.com/en-sg/windows7/sleep-

and-hibernation-frequently-asked-questions

Sleep (AKA: Stand By, Suspend)
http://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questionshttp://windows.microsoft.com/en-sg/windows7/sleep-and-hibernation-frequently-asked-questions


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Replacing the Power Supply


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Disconnect the

AC Power Cord.


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On-OffSwitch


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Power to

Motherboard


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The Power Supply

is held in place

by four screws.


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Power

Supply


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Reinstall the power supply.


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Links and References

www.google.lko https://www.google.com/search?q=Power+Supply+Unit

www.duckduckgo.como https://duckduckgo.com/?q=Computer+Power+Supply

www.wikipedia.orgo http://en.wikipedia.org/wiki/Power_supply_unit_(computer)
https://www.google.lk/https://www.google.com/search?q=Power+Supply+Unithttps://www.duckduckgo.com/https://duckduckgo.com/?q=Computer+Power+Supplyhttps://www.wikipedia.org/http://en.wikipedia.org/wiki/Power_supply_unit_(computer)http://en.wikipedia.org/wiki/Power_supply_unit_(computer)https://www.wikipedia.org/https://duckduckgo.com/?q=Computer+Power+Supplyhttps://www.duckduckgo.com/https://www.google.com/search?q=Power+Supply+Unithttps://www.google.lk/


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PC Fundamentals

End

05. power supply unit (psu)

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