Voltage monitoring circuit, test method therefor, and voltage monitoring system

摘要

A voltage monitoring circuit includes a plurality of voltage input terminals which input a voltage across each of a plurality of series-coupled battery cells, a selection circuit which, by selecting two of the voltage input terminals, selects a voltage across one of the battery cells; an A/D converter which converts the voltage across the battery cell into a digital value, a control unit which sends the digital value to an external controller, a ground wiring which is coupled to a ground terminal for inputting a ground level voltage for the voltage monitoring circuit, the ground terminal being among the voltage input terminals, and through which the voltage monitoring circuit is supplied with the ground level voltage, a terminal which is supplied with a lowest fixed potential, and a switch circuit which is coupled between the first terminal and the ground wiring.

主权项

1. A voltage monitoring circuit comprising:
a plurality of voltage input terminals which input a voltage across each of a plurality of series-coupled battery cells; a selection circuit which, by selecting two of the voltage input terminals, selects a voltage across one of the battery cells; an A/D converter which converts the voltage across the battery cell selected by the selection circuit into a digital value; a control unit which sends the digital value outputted from the A/D converter to an external controller; a ground wiring which is coupled to a ground terminal for inputting a ground level voltage for the voltage monitoring circuit, the ground terminal being among the voltage input terminals, and through which the voltage monitoring circuit is supplied with the ground level voltage; a first terminal which is supplied with a lowest fixed potential, and which is different from the ground terminal; and a first switch circuit which is coupled between the first terminal and the ground wiring.