Single-stage bridgeless PFC converter and control method

• Main Authors: WANG PENGFEI, LEE HO-WOOK, XING YANLIN, YE YIZHOU, DING MINGYUAN
• Format: Patent
• Language: Chinese; English
• Published: 14.11.2023
• 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

The invention relates to a single-stage bridgeless PFC (Power Factor Correction) converter and a control method, solves the problems of complex structure and limited output voltage range of the single-stage PFC converter, and belongs to the field of single-stage single-phase bridgeless PFC converter topology. The converter comprises a filter inductor, a bidirectional switch, an energy storage capacitor, a transformer, diodes D1-D2, filter capacitors Cdc1-Cdc2 and a control circuit, the converter works in a critical conduction state, and when the converter works in a voltage reduction mode, the control circuit controls the converter according to a voltage reduction mode control equation VmTon = vac; when the converter works in a boost mode, the control circuit controls the converter according to a boost mode control equation VmTon = vaca + nVdc/2; the converter can be flexibly switched between a step-down mode and a step-up mode, the conduction time Ton of the converter is controlled according to control equat