SWITCHED-MODE POWER SUPPLIES HAVING BURST MODE OPERATION FOR REDUCED POWER CONSUMPTION

摘要

Switched-mode power converters and control methods are disclosed. Example power converters include an input terminal (102), an output terminal (104), and a transformer (106) coupled between the input terminal (102) and the output terminal (104). The transformer (106) includes a primary winding (108) and a secondary winding (110). The power supply (100) also includes at least one switch (112) coupled to the primary winding (108), and a primary controller (114) coupled to the at least one switch (112) to control switching operation of the at least one switch (112). The primary controller (114) includes a voltage reference (116). The power supply (100) further includes a secondary controller (118) configured to detect a no load condition at the output terminal (104), and operate the primary controller (114) in a burst mode by adjusting the voltage reference (116) of the primary controller (114) when the secondary controller (118) detects the no load condition at the output terminal (104).