Patent ID: 7405579

Claim:
A voltage detector comprising: a plurality of voltage detector units for detecting output voltages of cells and transmitting the detected results, the voltage detector units each being powered by an associated block of a plurality of blocks divided from a high voltage battery having a plurality of secondary unit cells connected in series each other; a voltage detector control device powered by a low voltage battery with a voltage lower than the high voltage battery for transmitting a detection instruction to the plurality of the voltage detector units; a communication line interconnected between the plurality of the voltage detector units and the voltage detector control device; an insulator interface arranged on the communication line for communicating between the plurality of the voltage detector units and the voltage detector control device in an electrically insulated manner; wherein the communication line has a first communication line for transmitting the detection instruction, the first communication line having a first main line and a plurality of first branch lines, one end of the first main line being connected to the voltage detector control device, the plurality of the first branch lines being branched from the first main line and connected to the respective voltage detector units; the voltage detector control device transmits the detection instruction including an assignment of an address of the blocks to the plurality of the voltage detector units through the first communication line; and the plurality of the voltage detector units each detect the output voltages of the associated block when the address of the detection instruction transmitted from the voltage detector control device through the first communication line is a self-address of the voltage detector unit.