{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
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  "description": "The invention relates to a key control circuit with delayed safety shutdown of an electronic device comprising a key switch input (IN) for detecting a key removal; a capacitor (C DELAY ) for storing a charge during a predefined time delay; and an output control signal (OUT) enabling to shut down…",
  "path": "/patents/997564",
  "publishedAt": "2012-10-03T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60R25/04",
    "DELPHI TECH INC [US]"
  ],
  "textContent": "The invention relates to a key control circuit with delayed safety shutdown of an electronic device comprising a key switch input (IN) for detecting a key removal; a capacitor (C DELAY ) for storing a charge during a predefined time delay; and an output control signal (OUT) enabling to shut down said electronic device after said predefined time delay has elapsed; characterized in that it further comprises a delay circuit made of discrete components comprising a temperature compensated current source (2) adapted for charging the delay capacitor; a temperature compensated voltage source (4) defining a trigger point at which the delay circuit toggles once the stored charge corresponds to the predefined time delay; and a temperature compensated switch (6) adapted for toggling the delay capacitor from a charge state into a discharge state and releasing the output control signal.",
  "title": "Key switch dependent safety shutdown mechanism with accurate time delay"
}