| 摘要 |
PURPOSE:To prevent the reverse charging of batteries, and to obviate the deterio ration of the batteries by mounting a voltage comparison circuit detecting a voltage drop. CONSTITUTION:When a switch 7 is turned ON, differential voltage is generated on the terminal faces of each differential amplifier 12-15 by the terminal volt age of respective batteries 2-5, and difference sections are input to an AND gate 16. An output from the AND gate 16 energizes a base for a transistor 17 through a resistor 27, and the transistor 17 is made conductive and a motor 6 is started. When the batteries 2-5 are discharged continuously, the batteries 2-5 having the smallest capacity start a voltage drop and the set batteries 2-5 reach the Zener voltage or less of Zener diodes 8-11, sections among the + and -terminals of the differential amplifiers 12-15 reach zero voltage, and outputs are stopped. Consequently, the output from the AND gate 16 is also stopped, the transistor 17 is made non-conductive, and conduction of the motor 6 is interrupted. Accordingly, when the set batteries 2-5 having the smallest capacity are discharged completely, reverse charging is prevented, thus obviating the deterioration of the batteries.
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