SECONDARY CELL STATE DETECTOR

摘要

One-side plates of first and second condensers are connected to a one-side electrode of one of a plurality of secondary cells. First switches connect the other-side electrode of the secondary cell to the other-side plate of one of the first condenser and the second condenser. An MCU controls the first switches to connect the other-side electrode of the secondary cell to the other-side plate of the first condenser when the plurality of secondary cells is in a first state, and then connect the other-side electrode of the secondary cell to the other-side plate of the second condenser when the plurality of secondary cells is in a second state. A differential amplifier circuit outputs a differential voltage of voltages of the other-side plates of the first condenser and the second condenser. A cell monitoring IC detects states of the secondary cells based on the differential voltage.

主权项

1. A secondary cell state detector that detects states of a plurality of secondary cells connected to one another in series, the secondary cell state detector comprising:
a first condenser and a second condenser, each of which has a one-side plate connected to a one-side electrode of one of the plurality of secondary cells: a first switch connecting the other-side electrode of the one of the secondary cells to the other-side plate of one of the first condenser and the second condenser; a first switch control unit controlling the first switch to connect the other-side electrode of the one of the secondary cells to the other-side plate of the first condenser when the plurality of secondary cells is in a first state, and then connect the other-side electrode of the one of the secondary cells to the other-side plate of the second condenser when the plurality of secondary cells is in a second state; a differential amplifier circuit outputting a differential voltage of voltages of the other-side plates of the first condenser and the second condenser; and a cell state detecting unit detecting a state of the secondary cell based on the differential voltage.