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Method and apparatus for measuring battery charge and discharg current using a direct analog-to-digital conversion of a charge/discharge replica current
Method and apparatus for measuring battery charge and discharg current using a direct analog-to-digital conversion of a charge/discharge replica current
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机译：使用充电/放电复制电流的直接模数转换来测量电池充电和放电电流的方法和装置
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摘要
Disclosed is a method for charging a battery and circuitry for performing the method. The method includes steps of: (A) generating at a first node a battery charge current (Icharge) for charging the battery; (B) generating at a second node a replica current (Irep) from Icharge, where IrepIcharge; and (C) operating a closed loop current sink for sinking Irep, where a digital output of said closed loop current sink is a measure of the magnitude of Icharge. In the preferred embodiment the digital output is input to a control circuit for controlling the generation of Icharge. Also in the preferred embodiment the closed loop current sink is constructed from a multi-stage DAC that is driven by an output of an n-level digital filter that is incremented or decremented as a function of a voltage difference between the first node and the second node. Preferably the multi-stage DAC is a multi-stage current steering DAC, and the n-level digital filter is constructed using an up/down counter. A selection of stages of the multi-stage DAC to be turned off and on is made by a DEM logic block that is interposed between the output of the counter and the multi-stage DAC. The disclosed circuitry and method may be extended for providing a battery discharge measurement circuit for enabling a battery capacity test to be performed.
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