| 摘要 |
PURPOSE:To use an extreamly ordinary diode on the market when an operation current is an ultra heavy current by constituting a diode circuit splitting a current into plural diodes. CONSTITUTION:A diode circuit 9A is composed of both a unit of a diode 12a in which plural of, for instance, two of compact, lightweight and same rating diodes 13 of small current capacity are connected in parallel, and another unit of diode 12b which is connected in reverse parallel with this unit of the diode 12a. When a superconductive breakdown is generated in a permanent current switch 2, a voltage IOP.RN much higher than a turn-on voltage of the diode 13 is added to the diode circuit 9A. As, according to a direction of a current, the plural diodes 13 of either the unit of diode 12a or 12b receive momentarily a voltage higher than all of the turn-on voltages, they turn on. Therefore, almost all of operation currents IOP are split into the diodes 13, a permanent current switch superconductive body 4 of a permanent current switch 2 is completely protected without any burning. |
