| 摘要 |
PURPOSE:To reduce the power loss due to gate inverse current derivation, by restricting the rate of rise of voltage fed between the anode and cathode of thyristor immediately after the turn-off of GTO. CONSTITUTION:When the GTO 21 turns on, the electric charge of the capacitor 27 is discharged via the resistor 26, GTO21, capacitor 30, and diode 29, and the capacitor 30 is charged so that the emitter of the transistor 31 is negative. Next, when the base current is given to the transistor 31 and the transistor 31 is turned on at the time to be turned off of GTO21, the negative charge voltage is fed to the gate of GTO21 by the capacitor 30, gate inverse current is fed to the gate of GTO21, which is turned off. With GTO 21 turned off, the capacitor 27 is charged via the load 22 and the diode 23. |
