Device for controlling charging voltage

A method for controlling a charging voltage, the method comprising:

• comparing via a voltage comparison unit a charging voltage of a battery with a first reference voltage and to output a path selection signal through an output terminal;
• and
• selecting via a path selector one from a first path and a second path according to the path selection signal,
• the first path being to connect the battery to a charging power supply,
• the second path being to connect the battery to the charging power supply with a voltage drop unit being interposed between the battery and the charging power supply, and
• the voltage drop unit being to drop the charging voltage by a preset magnitude.

A system for controlling a charging voltage, the system comprising:

• means for comparing a charging voltage of a battery with a first reference voltage and to output a path selection signal through an output terminal;
• and
• means for selecting one from a first path and a second path according to the path selection signal,
• the first path being to connect the battery to a charging power supply,
• the second path being to connect the battery to the charging power supply with a voltage drop unit being interposed between the battery and the charging power supply, and
• the voltage drop unit being to drop the charging voltage by a preset magnitude.