SMPS(switched mode power supply)

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SMPSSwitch Mode Power Supply
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AT (Advanced Technology) and ATX (Advanced
Technology Extended) are two incompatible power
supply standards. While both power supplies
share some of the same connectors, the technology
behind both of them is quite different, requiring
different motherboards and computer cases.The
AT style was used from approximately 1980-1997,
while the ATX standard is current.

• SMPS Is a Main Component of Computer,It Convert
  AC Voltage in to DC
• Voltage and Provide Required Power To allComputer
  Parts, like
• Motherboard, Hard-disk, DVD R/W, FAN, etc...
• ConvertInput AC 220 V to 230 V Output DC 3.3V,
  5V,12V

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• Types of
  SMPS
• AT (Advance Technology)
• 
  

ATX (Advance Technology Extended)
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ATX Main Power Connecter front view
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AT
Difference between AT ATX SMPS
ATX

• 1. The power switch of AT style
• power supplies is integrated directly
• into the power supply itself.
• 2. This is a physical switch that
• turns the power supply on and off.
• 3. lower wattage less than 250 Support
• 4. AT SMPS Having 12 Pins
• Motherboard Power Supply
• connector. Divided in to 2 parts 6
• pins P8 6 pins P9
• 5. Molex Connector 4 pins (HDD,
• DVD RW, FAN)
• 6. MINI Connector 4 pins (FDD)
• 7. 2 pins Connector Goes to Cabinet
• Power Button

• 1. ATX style power supplies use a "soft switch"
  that is controlled by the
• motherboard.
• 2. This enables a computer with an
• ATX power supply to power off via
• software.

3. Higher wattage 300 to 400 Support 4. ATX SMPS
Having 20 to 24 Pins Motherboard Power Supply
Connector, Called P1 ATX Connector. 5. Molex
Connector 4 pins (HDD, DVD RW, FAN) 6. MINI
Connector 4 pins (FDD) 7. SATA Molex Connector
(HDD, DVD RW)
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AT Connector
ATX Connector
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SMPS Troubleshooting
To Check SMPS is working Or Not, take one copper
wire and short it with green pin and black pin,
if SMPS fan is spinning means SMPS is ok. But
SMPS Molex, Mini, and CPU P4 Connector Should be
ok. We have to Check Voltage of Molex connector
Mini Connector and CPU Connector Manually
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