| CPC G01R 31/3835 (2019.01) [G01R 31/396 (2019.01)] | 12 Claims |
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1. An apparatus for measuring voltage in a battery comprising a plurality of battery cells connected in series, the apparatus comprising:
a positive voltage sensing circuit configured to detect each voltage of the plurality of battery cells, received through a plurality of sensing terminals, within a positive voltage range;
a reverse voltage protection circuit comprising a plurality of protection circuits, the plurality of protection circuits comprising first ends respectively connected to the plurality of sensing terminals different from each other, and second ends connected to each other,
wherein each of the plurality of protection circuits controls a conductive state between a sensing terminal and the first node based on a voltage of the sensing terminal to which the first end is connected, and
wherein each of the plurality of protection circuits is configured to allow a feedback current to flow from the first node to each of the sensing terminals based on a negative voltage of each of the sensing terminals to which the first end is connected and then return to the first node via the boosting resistor;
a boosting resistor comprising a first end connected to at least one electrode of the battery,
wherein the boosting resistor is configured to allow the feedback current to flow from one electrode of the battery to the second node to generate a boosting voltage for controlling the plurality of sensing terminals to have a positive voltage; and
a reverse voltage sensing circuit configured to:
detect a voltage applied between a first node at which the second ends of the plurality of protection circuits are connected to each other and a second node to which a second end of the boosting resistor is connected; and
based on the detection of the voltage applied between the first and second nodes, output a signal indicating whether a reverse voltage is generated in the battery.
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