New Configuration of Contacts for Increasing the Threshold Current of Arc-Free Commutation in a DC Hybrid Switch
New Configuration of Contacts for Increasing the Threshold Current of Arc-Free Commutation in a DC Hybrid Switch
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DOI：
10.1109/tcpmt.2020.2998817
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
Chomrong Ou;Huang Yinming;K. Yasuoka
中科院分区：
文献类型：
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作者：
Chomrong Ou;Huang Yinming;K. Yasuoka
混合直流开关（HDCS）由于具有导通损耗低、电流中断快等优点而受到广泛关注。在低电流中断的情况下，触点之间不会产生电弧。然而，电弧放电发生在触点打开后的高电路电流。电弧放电是一种有害的现象。它腐蚀触点的表面，降低触点之间的绝缘强度。本文提出了一种新的接触配置，可以增加无弧换向的阈值电流。触头为铜碳结合的长方体形状。当触头处于闭合位置时，触头的铜和碳材料接触。因此，可以实现低接触电阻。当触点开始打开时，铜的接触点开始减少，直到破裂，但是具有比铜更高电阻率的碳仍然保持接触。在接触的较高电阻的情况下，电流被进一步换向到半导体器件，直到接触处的电流变低。在触点破裂之后，来自电路中的电感的低浪涌电压不能点燃电弧放电。因此，可以实现无电弧换向。
Hybrid dc switches (HDCSs) have attracted considerable attention due to the low ON-state loss and fast current interruption. With low current interruption, there is no arc generation between the contacts. However, arc discharge occurs between the contacts after the contact opens for a high circuit current. Arc discharge is a harmful phenomenon. It erodes the surface of the contacts and decreases the insulation strength between the contacts. This article presents a new configuration of contacts that can increase the threshold current for arc-free commutation. The contact has a cuboid shape with a join of copper and carbon. When the contacts are in the closing position, the copper and carbon materials of the contacts come in contact. Then, a low contact resistance can be achieved. When the contacts start opening, the contact spots of the copper start decreasing until rupture, but carbon, which has a higher resistivity than copper, still remains in contact. With a higher resistance of the contacts, the current is further commutated to the semiconductor device until the current at the contacts becomes low. After the contacts rupture, the low surge voltage from the inductance in the circuit cannot ignite arc discharge. Thus, arc-free commutation can be achieved.