| 摘要 |
PURPOSE:To obtain an effect equivalent to the effect obtained by utilizing a gate driving circuit in which both gates are provided with a gate controlling power supply, by providing a capacitor between one gate and the main electrode connected with a gate controlling power supply for the other gate. CONSTITUTION:When a switch 16 is opened and a switch 17 is closed, by P<+>- N<->-N<+> junction between a gate 14 and a cathode 1 is biased reversely. Under this condition, holes and electrons are swept away from a gate electrode 8 and a cathode electrode 6, respectively, as the reverse current of the gate 4. When a channel 5 is thereby depleted completely, the current is inhibited from flowing from an anode 2 to the cathode 1 and the cathode current becomes zero. As a result, the anode current flows through an N type buffer layer 10, going out from a second gate 20, flowing via a capacitor 9, and stops, applying an overvoltage to the capacitor 9. At the next moment, the reverse recovery current flows, whereby electrons and holes are swept away from a second gate electrode 20 and an anode electrode 7, respectively. |
