Voltage detection apparatus and method of reducing dispersion of dark currents
AssigneesYazaki Corporation, Honda Motor Co., Ltd.
InventorsHidehiko Shimizu, Kimihiro Matsuura, Yusuke Tatara, Shintaro Uchida, Takayuki Yamamoto
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Abstract
A voltage detection apparatus includes a plurality of voltage detection units, each of which detects cell voltages of plural cells in each of blocks in a battery module. Each of blocks includes the plural cells connected in series. The plurality of voltage detection units are respectively supplied with power via power supply lines connected to the blocks. The plurality of voltage detection units are respectively provided with a plurality of current increase units for increasing dark currents so that the dark currents flowing through the power supply lines respectively become a same target value.
Claims7
A voltage detection apparatus, comprising:
- a plurality of voltage detection units, each of which detects cell voltages of plural cells in each of blocks in a battery module, the each of blocks including the plural cells connected in series;
- a plurality of power supply circuits, to which power is supplied via power supply lines connected to the blocks respectively;
- a dark current adjustment unit that adjusts dark currents respectively flowing through the plurality of power supply lines;
- a plurality of current increase units that increases the dark currents so that the dark currents respectively flowing through the power supply lines from the blocks when the voltage detection apparatus is in a sleep state become a same target value;
- and
- a plurality of current detection units which respectively detect the dark currents flowing through the plurality of power supply lines,
- wherein the plurality of voltage detection units are respectively supplied with the power from the plurality of power supply circuit via the power supply lines;
- and
- wherein the dark current adjustment unit includes:
- a target value setting unit which sets the target value based on the dark currents detected by the plurality of current detection units;
- and
- a current control unit which changes resistance values of the plurality of current increase units so that each of the dark currents flowing through the plurality of power supply lines becomes the target value.
A method of reducing the dispersion of dark currents flowing through a plurality of voltage detection units each of which detecting cell voltages of plural cells in each of blocks in a battery module, the each of blocks including the plural cells connected in series, the method comprising:
- detecting the dark currents flowing through the plurality of voltage detection units which are respectively supplied with power via power supply lines connected to the blocks;
- setting a target value based on the detected dark currents;
- adjusting the dark currents flowing through the plurality of voltage detection units by a plurality of current increase units respectively provided in the plurality of voltage detection units for increasing the dark currents flowing through the plurality of voltage detection units so that the dark currents flowing through the power supply lines when the voltage detection apparatus is in a sleep state become the target value;
- and
- changing resistance values of the plurality of current increase units so that each of the dark currents flowing through the plurality of power supply lines becomes the target value.
Dependencies are inferred from the claim text.