{
  "schemaVersion": "1.0",
  "id": "https://elect-learn.org/zh/guides/diode-symbol/",
  "url": "https://elect-learn.org/zh/guides/diode-symbol/",
  "markdownUrl": "https://elect-learn.org/zh/guides/diode-symbol/index.md",
  "jsonUrl": "https://elect-learn.org/zh/guides/diode-symbol/index.json",
  "language": "zh",
  "title": "二极管符号图解：阳极、阴极与电流方向",
  "description": "读懂二极管符号，区分阳极与阴极，并识别齐纳、肖特基、LED 与光电二极管变体；不要仅凭图形推断额定参数。",
  "kind": "reference-guide",
  "safetyNotice": "学习参考：不同国家/地区的电气规范、许可和验收主体差异很大，本课程不替代当地法规、持证培训、现场许可或主管部门要求。任何实操前都应断电、验电，并遵守当地 AHJ/监管机构和雇主流程。",
  "sections": [
    {
      "id": "direct-answer",
      "heading": "这个符号是什么意思？",
      "paragraphs": [
        "二极管通常画成指向横杠的三角形：三角形一侧是阳极（A），横杠一侧是阴极（K）。在常规电流模型中，正向偏置时电流从阳极流向阴极。",
        "符号表示的是方向，并不代表额定参数或实际回路状态。齐纳、肖特基、LED、光电二极管与桥式整流等变体各有标记；实际器件要对照图例、位号（常见 D 或 CR）和数据表确认。"
      ]
    },
    {
      "id": "symbol-figure",
      "heading": "查看符号",
      "figure": {
        "src": "https://elect-learn.org/images/reference/diode.svg",
        "alt": "二极管符号教学图：三角形指向一条竖直横杠。",
        "caption": "通用二极管符号：三角形指向阴极横杠；齐纳、肖特基、LED 与光电二极管等变体会增加不同标记。",
        "width": 160,
        "height": 100
      }
    },
    {
      "id": "read-the-drawing",
      "heading": "如何结合上下文读图",
      "items": [
        "先找位号（常见 D 或 CR），以及弯曲横杠端点、箭头等变体标记。",
        "根据三角形和横杠判断哪端是阳极、哪端是阴极，不要用线色或图纸位置推断。",
        "先追踪连接节点，并核对设备表或数据表，再推断功能、极性与额定参数。"
      ],
      "ordered": true
    },
    {
      "id": "common-confusions",
      "heading": "常见混淆与误判",
      "items": [
        "三角形指向阴极横杠，表示正向常规电流方向；它不是指导接线的箭头。",
        "有横杠的一端并不自动证明其在所有回路中都处于较低电位；要由外围回路和运行状态决定。",
        "LED 与光电二极管变体都带箭头，但箭头方向与周边标注使其含义不同。",
        "二极管符号不代表该回路可以随意测量或测试；测量边界由适用程序决定。"
      ]
    },
    {
      "id": "reading-check",
      "heading": "练习：判断符号信息边界",
      "question": "图纸中的二极管三角形指向横杠，横杠一侧标为 K。哪端是阳极？正向偏置时常规电流向哪个方向流？",
      "answer": "三角形一侧是阳极；正向偏置时常规电流从阳极经二极管流向阴极（K）。器件型号与额定参数仍需由图例和数据表确认，单凭符号无法确定。"
    },
    {
      "id": "sources-and-next",
      "heading": "标准、来源与相关符号",
      "paragraphs": [
        "这些是独立绘制的教学图，帮助练习读图；实际含义仍由项目图例、适用标准和设备资料决定。 资料核对日期：2026年10月29日。"
      ],
      "links": [
        {
          "title": "IEC 60617 — graphical symbols for diagrams",
          "url": "https://webstore.iec.ch/en/publication/2723"
        },
        {
          "title": "IEC 60617 — 电气图形符号数据库",
          "url": "https://webstore.iec.ch/en/publication/2723"
        },
        {
          "title": "美国能源部 — 工程符号、图纸与制图",
          "url": "https://www.energy.gov/sites/default/files/2026-04/DOE-HDBK-1016-93_VOL2.pdf"
        },
        {
          "title": "电气图纸符号指南：原理图、单线图、平面图与接线图读法",
          "url": "https://elect-learn.org/zh/guides/electrical-drawing-symbols/"
        },
        {
          "title": "电阻符号图解：IEC 矩形与美式锯齿形",
          "url": "https://elect-learn.org/zh/guides/resistor-symbol/"
        },
        {
          "title": "电容器符号图解：有极性与无极性怎么区分",
          "url": "https://elect-learn.org/zh/guides/capacitor-symbol/"
        },
        {
          "title": "电感器符号图解：线圈、铁芯线与常见变体",
          "url": "https://elect-learn.org/zh/guides/inductor-symbol/"
        },
        {
          "title": "内容责任与审校状态",
          "url": "https://elect-learn.org/zh/methodology/"
        }
      ]
    }
  ],
  "dateModified": "2026-10-29",
  "datePublished": "2026-10-29",
  "publisher": {
    "name": "Elect Learn",
    "url": "https://elect-learn.org"
  },
  "review": {
    "status": "not-independently-reviewed",
    "statement": "尚无独立专业审校记录。参考来源不代表来源机构审校或认可本站。",
    "policyUrl": "https://elect-learn.org/zh/methodology/"
  }
}