| 摘要 |
PURPOSE:To provide a snubber circuit of a self-extinguishing type semiconductor element adapted for a large capacity without loss by providing a switch element in a circuit for transferring the charge of a snubber capacitor to the second capacitor. CONSTITUTION:A thyristor ThR is provided in series with a reactor LR, and a snubber capacitor of a freewheel diode DF is commonly used as a regenerative capacitor CR. When an ON signal is applied to the thyristor ThR substantially in synchronization with the turn ON of a GTO thyristor, the charge of a snubber capacitor CS is transferred to the capacitor CR, and the thyristor ThR is then turned OFF. When the GTO thyristor is turned OFF, the charge of the capacitor CR is applied to a load, while the capacitor CS is overcharged. When the GTO thyristor is then turned ON, the charge of the capacitor CS is transferred to the capacitor CR. |
