Accurate battery current measurement system for a battery care unit
First Claim
1. A current measurement system for measuring the current flowing through a battery, the current measuring system comprising:
- a shunt resistor in electrical communication with the battery, the shunt resistor operative to generate a shunt voltage in response to the current flowing through the battery;
a voltage to frequency converter in electrical communication with the shunt resistor, the voltage to frequency converter being operative to generate a frequency signal from the shunt voltage; and
a processor in electrical communication with the voltage to frequency converter, the processor being operative to determine the current flowing through the battery in response to the frequency signal generated by the voltage to frequency converter such that an accurate measurement of current can be made.
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Accused Products
Abstract
A current measurement system for a battery is provided. The current measurement system has a shunt resistor in electrical communication with the battery. The shunt resistor is operative to generate a shunt voltage in response to the current flowing through the battery. The system further includes a voltage to frequency converter in electrical communication with the shunt resistor. The voltage to frequency converter is operative to generate a frequency signal in response to the shunt voltage. A processor of the system determines a frequency value from the frequency signal and determines the current of the battery from predetermined current values. In this respect, the processor can linearly interpolate the current through the battery from the value of the frequency signal and stored predetermined current values such that an accurate current measurement can be made.
7 Citations
20 Claims
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1. A current measurement system for measuring the current flowing through a battery, the current measuring system comprising:
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a shunt resistor in electrical communication with the battery, the shunt resistor operative to generate a shunt voltage in response to the current flowing through the battery;
a voltage to frequency converter in electrical communication with the shunt resistor, the voltage to frequency converter being operative to generate a frequency signal from the shunt voltage; and
a processor in electrical communication with the voltage to frequency converter, the processor being operative to determine the current flowing through the battery in response to the frequency signal generated by the voltage to frequency converter such that an accurate measurement of current can be made. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring the current of a battery, the method comprising the steps of:
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a) generating a voltage in response to the current flowing through the battery;
b) converting the voltage from the battery into a frequency signal; and
c) determining the current flowing through the battery from the frequency signal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of generating a current measurement for a battery, the method comprising the steps of:
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a) generating a prescribed current through the battery;
b) measuring the voltage of the battery for the prescribed current;
c) converting the voltage into a frequency signal;
d) associating the value of the frequency signal with the prescribed current value;
e) storing the value of the frequency signal and the associated current value; and
f) further determining the current flowing through the battery by converting a voltage of the battery to a frequency signal and comparing the value of the frequency signal to the stored frequency value in order to interpolate a current value therefrom. - View Dependent Claims (17, 18, 19, 20)
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Specification