| 摘要 |
PURPOSE:To reduce the loss of a rectifier by detecting the coil voltage of a transistor and driving a circulating switching element. CONSTITUTION:Since a positive voltage is generated at the (.) mark side of the coil n5 of a conversion transformer 4 is generated when a transistor 2 is turned ON, the output of an inverter 12 becomes zero, a rectifying field effect transistor 5 becomes ON, and a circulating field effect transistor 6 becomes OFF. Accordingly, the voltage of the coil n2 of a conversion transistor is transmitted to an output terminal 9. When the transistor 2 becomes OFF, the transistor 5 becomes OFF and the transistor 6 becomes ON. Accordingly, the voltage of the coil n2 of the conversion transistor is blocked, and a current from the smoothing choke coil 7 is circulated. The ON voltages of the transistors 5, 6 are suppressed to low value by the above operation, thereby forming a rectifier having low loss. |
