Voltage detection device
View Patent ↗A voltage detection device includes: a plurality of voltage-detecting ICs installed in order to detect voltages of a plurality of blocks of a secondary battery, each of the voltage-detecting ICs being installed for each of the blocks; and an interruption control unit that controls interruption operations of the voltage-detecting ICs. After resetting all of the voltage-detecting ICs by transmitting a trigger signal to all of the voltage detecting ICs, the interruption control unit transmits a control signal in which an address of a voltage-detecting IC allowed to execute an interruption operation is designated. Each of the voltage-detecting ICs receives the control signal within a designated time set in advance, executes the interruption operation when an address of its own is designated, and is left reset when the address of its own is not designated.
1. A voltage detection device for detecting a voltage of a secondary battery composed by connecting a plurality of unit cells in series to one another, the voltage detection device comprising:
a plurality of voltage detectors installed in a high-voltage region connected to the secondary battery, each of the voltage detectors being installed, in order to detect a voltage of each of a plurality of blocks having the unit cells divided thereinto, for each of the blocks; and
a main microcomputer including an interruption control unit for controlling interruption operations of the voltage detectors, the interruption control unit being installed in a low-voltage region insulated from the high-voltage region, wherein
a trigger signal line transmits a trigger signal from the interruption control unit through an insulating device to the high-voltage region, and distributes and transmits the trigger signal to all of the voltage detectors in the high-voltage region to thereby cause all of the voltage detectors to be shifted to a reset state as a low current mode,
after all of the voltage detectors have been shifted to the reset state by transmitting the trigger signal to all of the voltage detectors via the trigger signal line, the interruption control unit transmits a control signal in which an address of a specific voltage detector desired to execute an interruption operation is designated among the voltage detectors, and
each of the voltage detectors receives the control signal within a predetermined designated time, executes the interruption operation when an address of its own is designated, and is left in the reset state when the address of its own is not designated.
2. The voltage detection device according to claim 1 , wherein the respective voltage detectors are connected to one another in a daisy chain fashion, and one specific voltage detector is connected to the interruption control unit.
3. The voltage detection device according to claim 1 , wherein the predetermined designated time is set in advance.
4. The voltage detection device according to claim 1 , further comprising a transistor provided on the trigger signal line, wherein the transistor acts to send the trigger signal to each of the voltage detectors when the trigger signal is provided on the trigger signal line.