Patent ID: 8860374

Claim:
A control circuit for a battery, the control circuit comprising: a measuring unit electrically connected with only a single connection to a current carrying line for charging and discharging the battery, wherein the measuring unit is configured to generate a voltage value corresponding to current in the current carrying line; an amplification unit connected to the measuring unit and configured to amplify the generated voltage value received from the measuring unit and output the amplified voltage value, wherein the amplification unit comprises an operational amplifier, and wherein the amplification unit is configured to have a negative feedback; and a level shift unit connected to the amplification unit and configured to generate an output voltage which is a level-shifted version of the amplified voltage value for any generated voltage value, wherein the level shifting unit level-shifts all of the amplified voltage values to positive polarity values with respect to a ground voltage, wherein the level shifting unit comprises an operational amplifier, and wherein the level shifting unit is configured to have a negative feedback.