| 摘要 |
PROBLEM TO BE SOLVED: To shorten the charging time of a charger for simultaneously charging a plurality of batteries, which require constant voltage control. SOLUTION: The charger comprises a first charging circuit, including a main transistor Q1 and a second charging circuit which includes a main transistor Q2 A charging voltage of each charging circuit is controlled to a constant voltage with an individual voltage monitoring means and a feedback circuit, including the main transistors and a charging current of each charging circuit is controlled to a constant current, with a current monitoring means for common sum of such charging currents and a plurality of feedback circuits including main transistors of the charging circuits. The voltage-monitoring means includes a circuit, comprising an operational amplifier IC3 in the first charging circuit, a circuit comprising an operational amplifier IC4 in the second charging circuit, while the common current monitoring mans comprises a resistor R1 for current detection and an operational amplifier IC1.
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