| 摘要 |
PURPOSE:To obtain an inverter with good efficiency by regenerating the energy stored in a snubber capacitor when a gate turn-off thyristor is turned off to a power supply through a capacitor and a regenerating inverter. CONSTITUTION:A series circuit comprising capacitors C31a, 31b and snubber diodes D32a, 32b is connected respectively in parallel with gate turn-off thyristors C31a, D32a and a connecting point between the C31b, D32b respectively via discharge D51a, 51b. When the GTO21a is turned on, a load current flows, and the energy stored in the C31a, 31b just after the GTO21a, 21b are turned off is discharged by a current passing through a path of D22b current limit reactor 24b load W and a current flowing to a path of D51b C6 D51a D32a L24a load W. A discharge current from the C31b is fed to the C6 at each of three phases and when the voltage rises, the energy of the C6 is regenerated to an AC power supply through as L7 and the regenerative inverter 8. |
