Device for measuring battery voltage

A device for measuring an output voltage of a battery, the device comprising:

• a detecting circuit for detecting the output voltage of the battery and generating a first detected voltage, a second detected voltage, and a third detected voltage accordingly;
• an encoding circuit comprising a first independent chip for generating a first code and a second code according to the first and second detected voltages;
• a control circuit for setting the second code to a default state when the third detected voltage indicates that the output voltage is lower than a predetermined value;
• and
• a processing circuit comprising a second independent chip for generating and outputting display control signals according to the first code and the set second code, the display control signals being used to control a display panel to display information of the output voltage of the battery;
• wherein the first independent chip comprises a first operational amplifier (op-amp) and a second op-amp;
• the encoding circuit further comprises a seventh resistor, and a voltage input terminal for operationally receiving an operation voltage, the first op-amp comprises a first inverting input terminal for receiving the first detected voltage, a first non-inverting input terminal coupled to the voltage input terminal via the seventh resistor, and a first output terminal for outputting the first code, the second op-amp comprises a second inverting input terminal for receiving the second detected voltage, a second non-inverting input terminal connected to the voltage input terminal, and a second output terminal for outputting the second code, the second non-inverting input terminal is wired to a reference voltage.