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Jerry Steele

Current Sensing Considerations in Li-ion Battery Management

Jerry Steele
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The op amp-based current sensing circuit described here is not new, it has been around for some time, but with very little discussion of the circuit itself. Somewhere along the line it was informally given the name: "Current Drive" circuit, so we'll call it that for now.
In high frequency switched systems where you measure current with a shunt, you may observe problems such as excessive amplitude on sine wave current ripple, overshoots on square wave ripple or any rapid transition of current, or excessive high-frequency noise. These problems are due to current shunt inductance, which becomes more significant at lower values of shunt resistors
Like all engineering solutions, zero-drift op amps also have their limitations. One of the less obvious is a result of the fact that the internal circuit contains a clocked system
In applications where the readout boards are remotely located, a voltage output current sense amplifier can be converted to a precision current output
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