Patent ID: 7944090

Claim:
A multi-output power conversion circuit for converting an input voltage into a standby voltage and a first output voltage, said standby voltage and said first output voltage being transmitted to a system circuit through a first output terminal and a second output terminal, respectively, said multi-output power conversion circuit comprising: a transformer comprising a primary winding assembly, a first secondary winding assembly and a second secondary winding assembly; a power switching circuit connected to said primary winding assembly of said transformer and a common terminal; a first rectifier-filter circuit connected to said first secondary winding assembly of said transformer for rectification and filtering off noise, thereby generating a first DC voltage; a second rectifier-filter circuit connected to said second secondary winding assembly of said transformer for rectification and filtering off noise, thereby generating a second DC voltage; a first switching circuit interconnected between said second rectifier-filter circuit and said second output terminal of said multi-output power conversion circuit; a voltage-adjusting circuit interconnected between said first rectifier-filter circuit and said first output terminal of said multi-output power conversion circuit; a feedback circuit connected to said first rectifier-filter circuit, said second rectifier-filter circuit and said system circuit, wherein said feedback circuit generates a feedback voltage according to a power-status signal issued by said system circuit; and a power control circuit interconnected between said power switching circuit and said feedback circuit for controlling on/off statuses of said power switching circuit according to said feedback voltage, wherein said feedback circuit generates said feedback voltage according to said power-status signal and selectively according to said first DC voltage or said second DC voltage.