Method and apparatus for measuring voltage of battery module of electric vehicle
First Claim
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1. An apparatus for measuring a value of a battery module voltage, the battery module being included in a modularized battery of an electric vehicle, the apparatus comprising:
- a differential amplifier circuit for outputting a modified voltage difference, the differential amplifier having input terminals and at least one resistor, the modified voltage difference being obtained by modifying a voltage difference inputted through the input terminals on the basis of a gain according to the resistivity of the at least one resistor;
an auxiliary power source for outputting a reference voltage;
a first switching circuit for controlling applying of the battery module voltage to the input terminals;
a second switching circuit for controlling applying of the auxiliary power source to the input terminals; and
a controller for calculating the value of the battery module voltage on the basis of an output voltage from the differential amplifier circuit, wherein the controller performs;
detecting a variable effective gain of the differential amplifier circuit;
applying the battery module voltage to the input terminals of the differential amplifier circuit;
detecting the output voltage of the differential amplifier circuit that is applied with the battery module voltage; and
calculating the value of the battery module voltage by modifying the output voltage of the differential amplifier circuit on the basis of the effective gain.
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Abstract
While measuring a value of a battery module voltage of an electric vehicle using a differential amplifier circuit having at least one resistor, an actual effective gain of the differential amplifier circuit depending on the resistivity of the resistor is measured and the output voltage of the differential amplifier is modified based on the actual effective gain to calculate the battery module voltage. In this way, accuracy of measuring the battery module voltage is enhanced.
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Citations
16 Claims
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1. An apparatus for measuring a value of a battery module voltage, the battery module being included in a modularized battery of an electric vehicle, the apparatus comprising:
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a differential amplifier circuit for outputting a modified voltage difference, the differential amplifier having input terminals and at least one resistor, the modified voltage difference being obtained by modifying a voltage difference inputted through the input terminals on the basis of a gain according to the resistivity of the at least one resistor;
an auxiliary power source for outputting a reference voltage;
a first switching circuit for controlling applying of the battery module voltage to the input terminals;
a second switching circuit for controlling applying of the auxiliary power source to the input terminals; and
a controller for calculating the value of the battery module voltage on the basis of an output voltage from the differential amplifier circuit, wherein the controller performs;
detecting a variable effective gain of the differential amplifier circuit;
applying the battery module voltage to the input terminals of the differential amplifier circuit;
detecting the output voltage of the differential amplifier circuit that is applied with the battery module voltage; and
calculating the value of the battery module voltage by modifying the output voltage of the differential amplifier circuit on the basis of the effective gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring a value of a battery module voltage using a differential amplifier circuit for outputting a modified voltage difference, the battery module being included in a modularized battery of an electric vehicle, the differential amplifier having input terminals and at least one resistor, the modified voltage difference being obtained by modifying a voltage difference inputted through the input terminals on the basis of a gain according to the resistivity of the at least one resistor, the method comprising:
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detecting a variable effective gain of the differential amplifier circuit;
applying the battery module voltage to the input terminals of the differential amplifier circuit;
detecting the output voltage of the differential amplifier circuit that is applied with the battery module voltage; and
calculating the value of the battery module voltage by modifying the output voltage of the differential amplifier circuit on the basis of the effective gain. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification