Voltage measuring apparatus and battery management system including the same
First Claim
1. A voltage measuring apparatus coupled to a plurality of battery cells coupled to each other in series to measure respective voltages of the battery cells, the voltage measuring apparatus comprising:
- a sample/hold amplifier configured to sample and hold positive electrode and negative electrode voltages of the battery cells to generate first and second output voltages;
a differential voltage converter configured to generate a battery cell voltage according to a voltage difference between a positive input terminal and a negative input terminal; and
a switching unit configured to control switching of first, second, third and fourth connection switches coupled between one of the first and second output voltages and one of the positive input terminal and the negative input terminal so that a polarity of the voltage difference is constant,wherein the sample/hold amplifier electrically insulates the switching unit from the battery cells.
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Abstract
The voltage measuring apparatus is connected to a plurality of battery cells connected to each other in series to measure respective voltages of the battery cells. The voltage measuring apparatus includes a sample/hold amplifier configured to sample and hold positive electrode and negative electrode voltages of the battery cells to generate first and second output voltages, a differential voltage converter configured to generate a battery cell voltage according to a voltage difference between a positive input terminal and a negative input terminal, and a switching unit configured to control the first and second output voltages and connection between the positive input terminal and the negative input terminal so that a polarity of the voltage difference is constant. The sample/hold amplifier electrically insulates the switching unit from the battery cells.
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Citations
15 Claims
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1. A voltage measuring apparatus coupled to a plurality of battery cells coupled to each other in series to measure respective voltages of the battery cells, the voltage measuring apparatus comprising:
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a sample/hold amplifier configured to sample and hold positive electrode and negative electrode voltages of the battery cells to generate first and second output voltages; a differential voltage converter configured to generate a battery cell voltage according to a voltage difference between a positive input terminal and a negative input terminal; and a switching unit configured to control switching of first, second, third and fourth connection switches coupled between one of the first and second output voltages and one of the positive input terminal and the negative input terminal so that a polarity of the voltage difference is constant, wherein the sample/hold amplifier electrically insulates the switching unit from the battery cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification