{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A fuel cell apparatus includes a fuel cell; a voltage level conversion unit configured to boost stack voltage generated by the fuel cell in response to a first control signal; a main battery configured to store boosted voltage output from the voltage level conversion unit; an auxiliary unit…",
  "path": "/patents/1385808",
  "publishedAt": "2026-06-04T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J7/933",
    "HYUNDAI MOTOR COMPANY"
  ],
  "textContent": "A fuel cell apparatus includes a fuel cell; a voltage level conversion unit configured to boost stack voltage generated by the fuel cell in response to a first control signal; a main battery configured to store boosted voltage output from the voltage level conversion unit; an auxiliary unit configured to be driven by auxiliary power generated using voltage stored in a sub-battery and to generate the first control signal; and a pre-charging unit configured to pre-charge the voltage level conversion unit using pre-charging voltage generated through the auxiliary unit.",
  "title": "FUEL CELL APPARATUS"
}