3. 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 Comparison
o http://en.wikipedia.org/wiki/Switched-
mode_power_supply#Advantages_and_disadvantages
29. 29
The Power Good Signal
+5 Volt signal generated by the power
supply.
It indicates that the power supply has
passed its self test and that its output
voltages have stabilized.
Usually occurs within first 0.5 seconds.
Prevents the system from running under
bad or unstable power conditions.
36. 36
Advanced Power Management (APM)
Eenables the operating system to work with
the BIOS to achieve power management.
Replaced by ACPI
Microsoft dropped support for APM in
Windows Vista
More:
http://en.wikipedia.org/wiki/Advanced_power_management
37. 37
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 for
hardware 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
38. 38
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/
ACPI
http://en.wikipedia.org/wiki/Advanced_Configuration_and_
Power_Interface
39. 39
Power Saving Modes
Blank (Black) Screen Saver
Display Off
Sleep
Hibernate
Power States
http://en.wikipedia.org/wiki/Advanced_Configuration_and_
Power_Interface#Power_states
Hybrid Sleep
51. 51
Links and References
www.google.lk
o https://www.google.com/search?q=Power+Supply+Unit
www.duckduckgo.com
o https://duckduckgo.com/?q=Computer+Power+Supply
www.wikipedia.org
o http://en.wikipedia.org/wiki/Power_supply_unit_(computer)