| 摘要 |
A synchronous rectification conversion circuit (100) comprises three transformer secondary inductors (TA-S, TB-S, TC-S), a current transformer, a controller (11), three groups of diodes (12-14), and a resistor (R). The current transformer comprises three primary inductors (CTA-P, CTB-P, CTC-P) and three secondary inductors (CTA-S, CTB-S, CTC-S). The three groups of diodes are connected in parallel on two ends of the resistor. The three transformer secondary inductors and the three primary inductors are alternately connected in series to form a first triangular structure. Three vertexes of the first triangular structure are separately connected to switch components (210, 220, 230) in the synchronous rectification circuit. The three secondary inductors are connected in series to form a second triangular structure. Three vertexes of the second triangular structure are separately connected to the three groups of diodes. The polarity of one end, connected to a corresponding node, of a first secondary inductor is the same as the polarity of one end, connected to a corresponding node, of the corresponding transformer secondary inductor. The controller controls ON and OFF of the switch components by sampling voltages of the diodes, thereby achieving the objective of precisely controlling ON and OFF of the synchronous rectification circuit. |
