| 摘要 |
A power supply unit having: transformer (2) with primary winding (2p) connected to D. C. power supply (1); switching element (3) connected to the primary winding (2p) of the transformer (2); forward controller (4) for controlling the switching element (3); rectifier element (5), choke coil (7), switching element (19) and smoothing circuit (8), all connected in series between secondary winding of the transformers (2) and output terminal (9); rectifier element (6) connected in parallel with the rectifier element (5) and the secondary winding; and switching element (21) and smoothing circuit (22) connected in series between an output terminal of the rectifier elements (5) and output terminal 24. The forward controller (4) controls the switching element (3) responsive to an output voltage of the smoothing circuit (8). Divider control circuit (23) controls the switching element (21) responsive to an output voltage of the smoothing circuit (22). <IMAGE> |
