Patent ID: 11913997
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A voltage detection apparatus that is applicable to an assembled battery that has a series-connection body of a plurality of battery cells, wherein:
the plurality of battery cells are divided to configure a plurality of detection blocks;
the voltage detection apparatus includes
a capacitor,
an input-side switch that connects the detection block to the capacitor in parallel, and opens and closes between the detection block and the capacitor,
a first differential voltage detection circuit that detects a voltage of the capacitor and outputs a first voltage based on the voltage of the capacitor,
a second differential voltage detection circuit that detects the voltage of the capacitor and outputs a second voltage based on the voltage of the capacitor,
an output-side switch that opens and closes between the capacitor, and the first differential voltage detection circuit and the second differential voltage detection circuit,
a reference voltage supplying unit that has a plurality of output terminals, supplies a first reference voltage to the first differential voltage detection circuit from a first output terminal among the plurality of output terminals, and supplies a second reference voltage to the second differential voltage detection circuit from a second output terminal,
a fault determining unit that has a plurality of input terminals, in which the first voltage is inputted to a first input terminal among the plurality of input terminals and the second voltage is inputted to a second input terminal, and that determines a fault in the first differential voltage detection circuit or the second differential voltage detection circuit based on the first voltage and the second voltage, and
a voltage output circuit that is supplied a third reference voltage from a third output terminal that is positioned between the first output terminal and the second output terminal in the reference voltage supplying unit, among the plurality of output terminals, and outputs a third voltage to a third input terminal that is positioned between the first input terminal and the second input terminal in the fault determining unit, among the plurality of input terminals; and

the third reference voltage is set to a voltage that differs from each of the first reference voltage and the second reference voltage, and the third voltage is set to a voltage that differs from each of the first voltage and the second voltage.