Cell voltage detection circuit, and method of detecting cell voltage
First Claim
1. A cell voltage detection circuit for a plurality of cells connected in series to each other in a battery and adapted to detect a voltage of each of the cells, comprising:
- a first input selecting means connected to positive and negative electrodes of each cell to select either the positive or negative electrode of a selected cell and acquire a voltage of the cell;
a second input selecting means connected to the positive and negative electrodes of each cell to select either the positive or negative electrode of the selected cell and acquire a voltage of the cell;
a voltage detecting means for acquiring a detected output voltage from output voltages from the first and second input selecting means, wherein the voltage detecting means comprises an operational amplifier and a plurality of resistor provided for the operational amplifier, the operational amplifier having a noninverting input terminal connected to the first input selecting means and an inverting input terminal connected to the second input selecting means; and
a processing means for converting the detected cell output voltage from the voltage detecting means from analogue to digital for calculating to thereby determine the voltage of the individual cell, wherein the processing means comprises an analogue/digital converter to convert a detected output voltage of a cell from an analog to digital, and an arithmetic unit which calculates a digital output from the analog/digital converter to provide a voltage of each cell.
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Abstract
A cell voltage detection circuit 20 comprises a first input selecting means 22 connected to the positive and negative electrodes of each of cells connected in series to each other to acquire a voltage from either a selected positive or negative electrode of an intended cell, a second input selecting means 24 connected to the positive and negative electrodes of each of the cells to acquire a voltage from either a selected positive or negative electrode of an intended cell, a voltage detector 30 to acquire a detected cell output voltage from output voltages of the first and second input selecting means 22 and 24, respectively, and a processing means 40 for converting a detected cell output voltage of the voltage detector 30 from analog to digital for calculation to provide the voltage of each cell.
27 Citations
15 Claims
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1. A cell voltage detection circuit for a plurality of cells connected in series to each other in a battery and adapted to detect a voltage of each of the cells, comprising:
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a first input selecting means connected to positive and negative electrodes of each cell to select either the positive or negative electrode of a selected cell and acquire a voltage of the cell;
a second input selecting means connected to the positive and negative electrodes of each cell to select either the positive or negative electrode of the selected cell and acquire a voltage of the cell;
a voltage detecting means for acquiring a detected output voltage from output voltages from the first and second input selecting means, wherein the voltage detecting means comprises an operational amplifier and a plurality of resistor provided for the operational amplifier, the operational amplifier having a noninverting input terminal connected to the first input selecting means and an inverting input terminal connected to the second input selecting means; and
a processing means for converting the detected cell output voltage from the voltage detecting means from analogue to digital for calculating to thereby determine the voltage of the individual cell, wherein the processing means comprises an analogue/digital converter to convert a detected output voltage of a cell from an analog to digital, and an arithmetic unit which calculates a digital output from the analog/digital converter to provide a voltage of each cell. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting a voltage of each of a plurality of cells connected in series to each other in a battery by a cell voltage detection circuit comprising a first input selecting means connected to positive and negative electrodes of each cell to select either the positive or negative electrode of a selected cell and acquire a voltage of the cell;
- a second input selecting means connected to the positive and negative electrodes of each cell to select either the positive or negative electrode of the selected cell and acquire a voltage of the cell;
a voltage detecting means for acquiring a detected output voltage from output voltages from the first and second input selecting means; and
a processing means for converting the detected cell output voltage from the voltage detecting means from analog to digital for calculation to thereby determine the voltage of the individual cell,the method comprising the steps of;
selecting an input to the first input selecting means and an input to the second input selecting means to supply from the voltage detecting means a positive detected output voltage to the analog/digital converter of the processing means and calculate an amplification factor of the voltage detecting means based on a known calibrating reference voltage connected to either the first or second input selecting means;
supplying a common mode voltage from a same electrode of a cell to the voltage detecting means via the first and second input selecting means to acquire a first positive detected output voltage indicative of an error due to the common mode voltage supplied to the voltage detecting means;
supplying to a noninverting input terminal of the voltage detecting means a voltage at the positive cell electrode selected by the first input selecting means and to an inverting input terminal of the voltage detecting means a negative cell voltage selected by the second input selecting means, to acquire a second positive detected output voltage; and
calculating as follows by the processing means to determine a cell voltage;
- View Dependent Claims (8, 9)
- a second input selecting means connected to the positive and negative electrodes of each cell to select either the positive or negative electrode of the selected cell and acquire a voltage of the cell;
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10. A circuit to detect a voltage of at least one cell in a battery, the circuit comprising:
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a first input selector adapted to be coupled to a positive and negative electrode of each cell;
a second input selector adapted to be coupled to a positive and negative electrode of each cell;
a voltage detector having a noninverting input terminal connected to the first input selector and an inverting input terminal connected to the second input selector; and
a processor having an analogue/digital converter coupled to the voltage detector and an arithmetic unit coupled to the analogue/digital converter. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification