Bestämning av ackumulator- spänningen mellan laddningen och laddningsanordning för ackumulatorer

摘要

The invention is related to a charging device (1) in which the charging current (Ich) used for charging a battery (2) is chopped according to a certain duty cycle ( eta ). A certain charging voltage reference value (Vch), which equals the real open circuit voltage of the battery charged, is known to the charging device (1). To achieve a correct duty cycle ( eta ), the terminal voltage of the battery is measured during the charging current pulse (Ion) and between the pulses. The open circuit voltage of the battery is calculated on the basis of the measurement results using the formula $where\; eta\; is\; said\; duty\; cycle,\; Vmax\; represents\; the\; voltage\; between\; the\; terminals\; of\; said\; battery\; (2)\; during\; the\; charging\; current\; pulse\; (Ion),\; Vmin\; represents\; the\; voltage\; between\; the\; terminals\; of\; said\; battery\; (2)\; between\; the\; charging\; current\; pulses\; and\; the\; coefficient\; K\; equals\; 1\; or\; the\; ratio\; of\; the\; average\; of\; the\; charging\; current\; (Ich)\; to\; its\; peak\; value.\; The\; duty\; cycle\; is\; altered\; in\; such\; a\; manner\; that\; the\; calculated\; value\; (Vbatt0)\; is\; brought\; close\; to\; said\; reference\; value\; (Vch).\mathop{\mathrm{image}}$