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增加元器件说明

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docs/硬件平台/关键元器件.md
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## 10D102K，氧化锌压敏电阻（MOV，Metal Oxide Varistor）
![image.png](https://lsky.bitnasdaq.vip/Y2XuuZ.png)
s![image.png](https://lsky.bitnasdaq.vip/Y2XuuZ.png)
### 工作原理
主体是氧化锌陶瓷，内部大量 ZnO 晶粒 + 晶界势垒，是双向非线性半导体：
- ✅ **正常电压（＜900 V）**：兆欧级高阻，近似开路，漏电流 μA 级别，几乎不耗电