直流アークレス（抑制）金属接点ハイブリッド・スイッチの試作と多数動作試験

抄録

We made a DC switch, which is composed of the commercial power relay and Si-IGBT. They are connected in parallel, and we controlled the timing of the relay metal contact switch and the IGBT ON/OFF timing. The operation principle is that the relay switch is open when the IGBT is ON. Then, the relay current flowed into the IGBT, and its commutation time is ∼0.25µ s. Finally, the current is interrupted by the IGBT. Therefore, we realized the non-arc operation. We also used the flywheel diode to avoid the surge voltage induced when we interrupted the direct current of the inductor by the IGBT. We tested its performance under the voltage and current of DC400V and 1A to 10A. We also tested multiple operations, up to 20,000 times, and had no failure of the non-arc operation completely. After the 20,000 times operations, we observed the surface of the metal contacts by scanning electron microscopy (SEM) and optical microscopy. The arc mark is observed clearly on the positive contact because the arc is not induced perfectly. But the arc mark on the negative contact is unclear. The rely resistance is almost the same as the new contact's after 20,000 times operation. This principle will be effective for high voltage and large current switches.