{
  "node": {
    "id": "term:blanking-delay",
    "type": "Term",
    "label": "Blanking delay",
    "properties": {
      "id": "blanking-delay",
      "name": "Blanking delay",
      "aka": [
        "blanking time",
        "masking time"
      ],
      "section": "topic-hvsafety",
      "definition": "A short window during which a protection or diagnostic input is deliberately ignored, so that an expected transient — the inrush when contactors close, a load step, switching noise — does not trip it. It spans microseconds in a gate driver’s desaturation protection to tens of milliseconds or more around contactor closure; too long a window delays reaction to a real fault.",
      "related": [
        "inrush-current",
        "pre-charge",
        "diagnostic-coverage",
        "contactor",
        "dtc"
      ],
      "url": "https://lemonergy.com/learn/glossary/blanking-delay/",
      "mentions": []
    }
  },
  "edges": [
    {
      "id": "edge:5081",
      "source": "term:blanking-delay",
      "target": "topic:topic-hvsafety",
      "type": "belongsTo",
      "properties": {
        "sourceFile": "terms.json"
      }
    },
    {
      "id": "edge:5082",
      "source": "term:blanking-delay",
      "target": "term:inrush-current",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5083",
      "source": "term:blanking-delay",
      "target": "term:pre-charge",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5084",
      "source": "term:blanking-delay",
      "target": "term:diagnostic-coverage",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5085",
      "source": "term:blanking-delay",
      "target": "term:contactor",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    },
    {
      "id": "edge:5086",
      "source": "term:blanking-delay",
      "target": "term:dtc",
      "type": "relatedTo",
      "properties": {
        "sourceFile": "terms.json",
        "meaning": "Related context; not a causal claim"
      }
    }
  ],
  "neighbors": [
    {
      "id": "topic:topic-hvsafety",
      "type": "Topic",
      "label": "High-voltage and functional safety",
      "properties": {
        "id": "topic-hvsafety",
        "name": "High-voltage and functional safety",
        "lede": "Keeping people safe from the pack’s voltage and keeping its electronics safe when they fail: insulation, switching, fusing and the functional-safety process.",
        "context": "Relate protection to faults, detection and response.",
        "example": "Normal-operation current limits do not demonstrate correct contactor behavior under a welded-contact or sensor fault.",
        "lesson_url": "https://lemonergy.com/learn/fundamentals/battery-basics/",
        "lesson_label": "Open battery basics"
      }
    },
    {
      "id": "term:inrush-current",
      "type": "Term",
      "label": "Inrush current",
      "properties": {
        "id": "inrush-current",
        "name": "Inrush current",
        "aka": [
          "inrush",
          "surge current",
          "switch-on surge"
        ],
        "section": "topic-hvsafety",
        "definition": "The brief current peak when a circuit is first energised, before its capacitors have charged or its magnetic parts have settled. Connected straight to a pack, an inverter’s empty DC-link capacitors would draw thousands of amperes, so a pre-charge circuit brings them to about 95% of pack voltage before the main contactor closes.",
        "related": [
          "pre-charge",
          "contactor",
          "inverter",
          "blanking-delay",
          "fuse-coordination"
        ],
        "url": "https://lemonergy.com/learn/glossary/inrush-current/",
        "mentions": [
          "pack-voltage"
        ]
      }
    },
    {
      "id": "term:pre-charge",
      "type": "Term",
      "label": "Pre-charge circuit",
      "properties": {
        "id": "pre-charge",
        "name": "Pre-charge circuit",
        "section": "topic-hvsafety",
        "definition": "A resistor and small contactor that charge the inverter’s capacitors slowly before the main contactor closes. Without it the inrush into empty capacitors can reach thousands of amperes and weld the main contactor shut.",
        "related": [
          "contactor",
          "battery-disconnect-unit",
          "inverter"
        ],
        "url": "https://lemonergy.com/learn/glossary/pre-charge/",
        "mentions": [
          "inrush-current"
        ]
      }
    },
    {
      "id": "term:diagnostic-coverage",
      "type": "Term",
      "label": "Diagnostic coverage",
      "properties": {
        "id": "diagnostic-coverage",
        "name": "Diagnostic coverage",
        "section": "topic-hvsafety",
        "definition": "The fraction of a component’s failure rate that a safety mechanism detects or controls. ISO 26262 treats coverage from about 60% as low, from 90% as medium and from 99% as high; comparing two independent measurements of the same cell voltage typically earns high coverage, while a simple plausibility check earns much less.",
        "formula": "coverage = λ_detected / λ_total",
        "related": [
          "hardware-safety-metrics",
          "functional-safety",
          "redundant-bms",
          "fmea",
          "dtc"
        ],
        "example": {
          "title": "Calculate a simplified coverage fraction",
          "text": "If relevant dangerous failure rates total 100 units and 90 of those units are detected by the stated diagnostics, this simplified coverage is 90%. Counting failure modes without weighting their rates gives a different quantity."
        },
        "url": "https://lemonergy.com/learn/glossary/diagnostic-coverage/",
        "mentions": [
          "cell-voltage"
        ]
      }
    },
    {
      "id": "term:contactor",
      "type": "Term",
      "label": "Contactor",
      "properties": {
        "id": "contactor",
        "name": "Contactor",
        "section": "topic-hvsafety",
        "definition": "A heavy-duty electrically operated switch that connects the pack to the vehicle or inverter and opens it on fault or shutdown. Packs use at least two, one per pole, plus a pre-charge path to avoid welding them on the first connection.",
        "related": [
          "pre-charge",
          "battery-disconnect-unit",
          "pyrofuse",
          "bms"
        ],
        "url": "https://lemonergy.com/learn/glossary/contactor/",
        "mentions": [
          "inverter"
        ]
      }
    },
    {
      "id": "term:dtc",
      "type": "Term",
      "label": "Diagnostic trouble code",
      "properties": {
        "id": "dtc",
        "name": "Diagnostic trouble code",
        "abbr": "DTC",
        "aka": [
          "fault code"
        ],
        "section": "topic-data",
        "definition": "A coded fault a controller stores when a check fails — a cell overvoltage, a sensor out of range, an isolation fault — with a status and often a snapshot of conditions when it occurred. Reading and interpreting DTCs is the first step of any battery root-cause analysis.",
        "related": [
          "uds",
          "bmu",
          "insulation-resistance",
          "freeze-frame"
        ],
        "url": "https://lemonergy.com/learn/glossary/dtc/",
        "mentions": [
          "insulation-fault"
        ]
      }
    }
  ]
}