{
  "$type": "site.standard.document",
  "description": "A cell balancing circuit monitors the voltage between serially connected cells and compares it to a reference voltage. From that comparison, the cell balancing circuit sources or sinks current into a midpoint node between rechargeable cells to keep the cells balanced during the charging process. In…",
  "path": "/patents/1071951",
  "publishedAt": "2005-12-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02J7/54",
    "MOTOROLA INC [US]"
  ],
  "textContent": "A cell balancing circuit monitors the voltage between serially connected cells and compares it to a reference voltage. From that comparison, the cell balancing circuit sources or sinks current into a midpoint node between rechargeable cells to keep the cells balanced during the charging process. In one preferred embodiment, the cell balancing circuit includes an op-amp, connected in a unity gain configuration. A voltage divider establishes a reference voltage equal to the average of the two cell voltages. The op-amp compares this average to the measured voltage at the midpoint node. When the average voltage exceeds the voltage at the midpoint node, the op-amp sources current into the midpoint node. When the average voltage falls below the voltage at the midpoint node, the op-amp sinks current from the midpoint node. By sourcing or sinking current, the cell balancing circuit allows the lesser charged cell to catch up with the more fully charged cell.",
  "title": "Cell Balancing circuit"
}