{
  "$type": "site.standard.document",
  "description": "This application discloses a direct current combiner box, an inverter, a photovoltaic system, and a protection method. The combiner box includes a switching device, a sampling circuit, and a controller. The switching device is connected in parallel between a positive input port and a negative input…",
  "path": "/patents/1399420",
  "publishedAt": "2025-12-24T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02H11/002",
    "HUAWEI DIGITAL POWER TECH CO LTD [CN]"
  ],
  "textContent": "This application discloses a direct current combiner box, an inverter, a photovoltaic system, and a protection method. The combiner box includes a switching device, a sampling circuit, and a controller. The switching device is connected in parallel between a positive input port and a negative input port. The sampling circuit is configured to collect at least one of an input parameter and an output parameter of the combiner box. The controller is configured to control the switching device to be closed when determining, based on the at least one parameter, that a short circuit occurs between a positive output cable and a negative output cable or a positive output cable and a negative output cable are reversely connected, so that the switching device, the positive input port, and the negative input port form a closed loop. When a short circuit occurs to an output port of the combiner box or a next circuit of the output port, most short-circuit currents form a return current through the closed switching device, to reduce a current that is generated at an input port of the combiner box and that is output from the output port of the combiner box. Therefore, an output cable of the combiner box is prevented from overcurrent burnout when an output current of the combiner box is excessively large. In this solution, the combiner box may be protected when the positive output cable and negative output cable are reversely connected.",
  "title": "DIRECT-CURRENT COMBINER BOX, PHOTOVOLTAIC SYSTEM AND PROTECTION METHOD"
}