| 主权项 |
1. A voltage detecting device for detecting a voltage of each of a plurality of unit batteries of an assembled battery, the unit batteries being connected in series, the voltage detecting device comprising:
an operation amplifier having an inverted input terminal and a non-inverted input terminal; a plurality of first capacitors being correspondingly provided for the plurality of unit batteries; a plurality of first switches each being disposed between a high potential terminal of corresponding one of the unit batteries and a first end of corresponding one of the first capacitors; a plurality of second switches each being disposed between a low potential terminal of corresponding one of the unit batteries and the first end of corresponding one of the first capacitors, the low potential terminal having a potential lower than that of the high potential terminal; a plurality of third switches each being disposed between the inverted input terminal of the operation amplifier and a second end of corresponding one of the first capacitors; a second capacitor and a fourth switch being disposed in parallel between the inverted input terminal of the operation amplifier and an output terminal of the operation amplifier; a plurality of fifth switches each being disposed between a voltage line and the second end of corresponding one of the first capacitors, the voltage line being applied with a specified voltage; and a control unit being connected to the first switches, the second switches, the third switches, the fourth switch and the fifth switches and configured to detect the voltage of each of the unit batteries while the first capacitors simultaneously hold an electric charge, wherein the control unit includes a configuration that:
closes the first switches and the fifth switches to charge the electric charge to the first capacitors;simultaneously opens all switches selected from a group consisting of all the first switches, all the fifth switches and all of both the first and fifth switches to hold the electric charge in the first capacitors;temporarily closes the fourth switch to reset electric charge of the second capacitor, while selecting one of the unit batteries in a predetermined order as a target unit battery for voltage detection; andcloses one of the second switches corresponding to the target unit battery and one of the third switches corresponding to the target unit battery, in a state where one of the first switches corresponding to the target unit battery and one of the fifth switches corresponding to the target unit battery are opened, to detect the voltage of the target unit battery. |
