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1. (WO2018176423) SWITCHED-MODE POWER SUPPLIES HAVING BURST MODE OPERATION FOR REDUCED POWER CONSUMPTION

Pub. No.:    WO/2018/176423    International Application No.:    PCT/CN2017/079126
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Apr 01 01:59:59 CEST 2017
IPC: H02M 3/335
Applicants: ASTEC INTERNATIONAL LIMITED
Inventors: LIU, Jun
LIU, Qingfeng
GONG, Xun
LI, Zhe
Title: SWITCHED-MODE POWER SUPPLIES HAVING BURST MODE OPERATION FOR REDUCED POWER CONSUMPTION
Abstract:
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).