Patent ID: 9496861
Filing Date: 2016-11-15
CPC Classification: G01R,H03K

Claim Text:
1. A multiplexer for voltage measurement configured to receive voltages at connection terminals of a plurality of battery cells connected in series and constituting a battery cell array and output one of the voltages, to measure voltages of the battery cells, the multiplexer comprising: a plurality of input terminals to which the voltages at the connection terminals of the plurality of battery cells are respectively input; an output terminal through which any one of the voltages input from the plurality of input terminals is output; a first switch disposed on a first channel extending between at least one high-voltage input terminal that is one of the plurality of input terminals and the output terminal and configured to establish or cut a connection between the high-voltage input terminal and the output terminal, the high-voltage input terminal being connected to a predetermined number of battery cells, the predetermined number being counted from a side where a highest voltage among the voltages respectively applied to the plurality of input terminals is applied; a plurality of second switches respectively disposed on second channels each extending between each of the input terminals other than the high-voltage input terminal and the output terminal so as to respectively correspond to the input terminals, and configured to selectively establish or cut a connection between any one of the input terminals other than the high-voltage input terminal and the output terminal; and a third switch disposed between a group of the plurality of second switches and an output terminal side end of the first switch, wherein each of the first switch and the third switch is configured to operate even by a voltage higher than a power supply voltage that is based on a voltage of the battery cell array, the voltage of the battery cell array being used to drive each of the first, second, and third switches.