Switching power conversion circuit and power supply using same

• Main Authors: CHIANG, CHIN TSAI, WEI, DONG, JIAO, DE-ZHI
• Format: Patent
• Language: Chinese; English
• Published: 21.05.2015
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a switching power conversion circuit that has a power-factor improvement function by having a two-stage circuit configuration.SOLUTION: A switching power conversion circuit of the present invention includes: a first power circuit for correcting a power factor and converting an input voltage into a bus voltage; a first feedback circuit connected to the first power circuit for outputting a first feedback signal according to the bus voltage; a second power circuit connected to the first power circuit for converting the bus voltage into an output voltage; a second feedback circuit connected to the second power circuit for outputting a second feedback signal according to the output voltage; and a controlling unit connected to the first power circuit, the second power circuit, the first feedback circuit, the second feedback circuit, and a system circuit for controlling the operation of the first power circuit according to the first feedback signal, controlling the operation of the s