SWITCHED CAPACITOR BATTERY UNIT MONITORING SYSTEM
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United States of America Patent
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Mar 13, 2015
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Mar 31, 2011
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Abstract
A switched capacitor battery monitoring system enables reliable measurement of the battery voltages of a plurality of batteries in a battery unit with a single microprocessor and or analog-to-digital converter. A battery unit having a plurality of batteries may have a switched capacitor battery monitor configured on each battery. Each switched capacitor battery monitor utilizes a capacitor that is charged to substantially the same voltage level as the battery it is attached to. The capacitor is isolated from the battery by a switch and the voltage level of the capacitor is provided to an analog-to-digital convened to measure the voltage level of said battery. This method enables the individual battery voltage to be measured and therefore does not measure the cumulative voltage of two or more batteries connected in series. This method maintains the measured voltage below a voltage threshold of the analog-to-digital converter and microprocessor.
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