11-12-2012, 02:45 PM
Switched-Mode DC Power Supplies
Switched-Mode.ppt (Size: 206.5 KB / Downloads: 144)
Five configurations
Flyback
Forward
Push-pull
Half Bridge
Full-Bridge
Operate at high frequencies
Easy to filter out harmonics
Mode 2 Operation -- Q1 turned OFF
Polarity of the windings reverses
Diode D1 conducts, charging C and providing current to the load RL
Secondary current falls to 0 before the next cycle begins
Features
Includes a “reset” winding to return energy
Secondary “dot” so that D2 forward biased when Q1 is ON – no energy stored in the primary
Operates in continuous mode