ASSEMBLED-BATTERY VOLTAGE MEASURING DEVICE AND ASSEMBLED-BATTERY VOLTAGE SYSTEM USING IT
First Claim
1. A voltage measuring device for use with an assembled battery including a plurality of series-connected cells, comprising:
- a sample-and-hold circuit including a first capacitor, a second capacitor and an operational amplifier, a sample-and-hold circuit being alternated between (a) a sample mode in which a signal input from a cell to be measured of the plurality of cells is sampled so that a voltage across the first capacitor becomes equal to a voltage across the cell to be measured, and a voltage across the second capacitor having its one end connected to one end of the first capacitor becomes equal to zero volts and (b) a hold mode in which the connection between the first capacitor and second capacitor is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal of the operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier; and
an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A voltage measuring device includes a sample-and-hold circuit which alternates between (a) a sample mode in which a signal input from a cell to be measured is sampled so that a voltage across a first capacitor becomes equal to a voltage across the cell to be measured, and a voltage across a second capacitor having its one end connected to one end of the first capacitor becomes equal to zero volts and (b) a hold mode in which the connection between the first and second capacitors is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal of an operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier, and an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal.
6 Citations
18 Claims
-
1. A voltage measuring device for use with an assembled battery including a plurality of series-connected cells, comprising:
-
a sample-and-hold circuit including a first capacitor, a second capacitor and an operational amplifier, a sample-and-hold circuit being alternated between (a) a sample mode in which a signal input from a cell to be measured of the plurality of cells is sampled so that a voltage across the first capacitor becomes equal to a voltage across the cell to be measured, and a voltage across the second capacitor having its one end connected to one end of the first capacitor becomes equal to zero volts and (b) a hold mode in which the connection between the first capacitor and second capacitor is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal of the operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier; and an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal. - View Dependent Claims (2, 3, 4, 5, 18)
-
-
6. A voltage measuring device for use in an assembled battery including a plurality of series-connected cells, comprising:
-
a sample-and-hold circuit including a first capacitor, a second capacitor and an operational amplifier, a sample-and-hold circuit being alternated between (a) a sample mode in which a signal input from a pair of first and second adjacent cells, as a candidate for measurement, of the plurality of cells is sampled so that a voltage across the first capacitor becomes equal to a voltage across the first cell, and a voltage across the second capacitor having its one end connected to one end of the first capacitor becomes equal to a voltage across the second cell and (b) a hold mode in which the connection between the first capacitor and second capacitor is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal the an operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier; and an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A voltage measuring device for use in an assembled battery including a plurality of series-connected cells, comprising:
-
a sample-and-hold circuit including a first capacitor, a second capacitor and an operational amplifier, a sample-and-hold circuit being adapted to be switched between first operation mode and second operation mode, the first operation modes alternating between (a) a first sample mode in which a signal input from a pair of first and second adjacent cells, as a candidate for measurement, of the plurality of cells is sampled so that a voltage across the first capacitor becomes equal to a voltage across the first cell, and a voltage across the second capacitor having its one end connected to one end of the first capacitor becomes equal to a voltage across the second cell and (b) a first hold mode in which the connection between the first capacitor and second capacitor is opened, the first capacitor establishes a connection between an inverting input terminal and a non-inverting output terminal of the operational amplifier, and the second capacitor establishes a connection between a non-inverting input terminal and an inverting output terminal of the operational amplifier and the second operation mode alternating between (c) a second sample mode in which a signal input from a cell to be measured of the plurality of cells is sampled so that the voltage across the first capacitor becomes equal to a voltage across the cell to be measured, and the voltage across the second capacitor becomes equal to zero volts and (d) a second hold mode in which the connection between the first capacitor and second capacitor is opened, the first capacitor establishes the connection between the inverting input terminal and the non-inverting output terminal of the operational amplifier, and the second capacitor establishes the connection between the non-inverting input terminal and the inverting output terminal of the operational amplifier; and an analog-to-digital converter which converts a signal output from the operational amplifier into a digital signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
Specification