1. COMP 364 Prof Jess Role@ UEAB 2006 Power Supplies and UPS

2. COMP 364 Prof Jess Role@ UEAB 2006 Power supplies Some peripheral devices have an AC adapter What is a power supply? Converts alternating current (AC,115 to 120 volts) to direct current (DC, 5 to 12 volts)

3. COMP 364 Prof Jess Role@ UEAB 2006 Power Problems No Power No Power Power turn on and shut down after a few minutes Power turn on and shut down after a few minutes Protection fuse always blow Protection fuse always blow No +12 or -12 volts output No +12 or -12 volts output No +5 or -5 volts output No +5 or -5 volts output Fan running no output Fan running no output

4. COMP 364 Prof Jess Role@ UEAB 2006 Power Management Idling time Idling time Monitor auto turn off Monitor auto turn off Hard drive shutdown Hard drive shutdown System Auto Shutdown System Auto Shutdown

5. COMP 364 Prof Jess Role@ UEAB 2006 Troubleshooting the Power Supply

6. COMP 364 Prof Jess Role@ UEAB 2006 Switcher Section

7. COMP 364 Prof Jess Role@ UEAB 2006 Basic Low Voltage Circuit

8. COMP 364 Prof Jess Role@ UEAB 2006 Regulated IC outputs

9. COMP 364 Prof Jess Role@ UEAB 2006 Power Supply Connectors

10. COMP 364 Prof Jess Role@ UEAB 2006 Basic Power Supply Semiconductor devices

11. COMP 364 Prof Jess Role@ UEAB 2006 Batteries Type Type Ni Cad Ni Cad Lithium Lithium Mercury Mercury Time duration Time duration 2 hrs 2 hrs 3 hrs 3 hrs 4 hrs 4 hrs 35 hrs 35 hrs