SYSTEM AND METHOD FOR MEASURING BATTERY INTERNAL RESISTANCE
First Claim
1. A system for measuring an internal resistance of a battery, the system comprising:
- a processor;
a load module responsive to the processor for applying a load across the battery;
a current sense subsystem for sensing the current flowing to the load module and generating a sensed current signal in accordance therewith; and
a multiplexer subsystem in communication with the current sense subsystem for detecting voltages with the load module coupled across the battery and released from the battery, and generating voltage signals in accordance therewith; and
a filtering and amplification subsystem responsive to said multiplexer subsystem, for filtering and amplifying a level of each of said voltage signals to produce a pair of modified voltage signals for use by said processor in determining said internal battery resistance of said battery.
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Abstract
In one aspect the present disclosure relates to a system for measuring an internal resistance of a battery. The system may involve: a processor; a load module responsive to the processor for applying a load across the battery; a current sense subsystem for sensing the current flowing to the load module and generating a sensed current signal in accordance therewith; a multiplexer module in communication with the current sense subsystem for detecting voltages with the load coupled across the battery and uncoupled from the battery, and generating voltage signals in accordance therewith; and a filtering and amplification subsystem responsive to the multiplexer module, for filtering and amplifying a level of each of the voltage signals to produce modified voltage signals for use by the processor in determining the battery internal resistance.
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Citations
20 Claims
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1. A system for measuring an internal resistance of a battery, the system comprising:
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a processor; a load module responsive to the processor for applying a load across the battery; a current sense subsystem for sensing the current flowing to the load module and generating a sensed current signal in accordance therewith; and a multiplexer subsystem in communication with the current sense subsystem for detecting voltages with the load module coupled across the battery and released from the battery, and generating voltage signals in accordance therewith; and a filtering and amplification subsystem responsive to said multiplexer subsystem, for filtering and amplifying a level of each of said voltage signals to produce a pair of modified voltage signals for use by said processor in determining said internal battery resistance of said battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for measuring an internal resistance of a battery, the system comprising:
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a processor; a load module responsive to the processor for applying a load across the battery; a current sense subsystem for sensing the current flowing to the load module and generating a sensed current signal in accordance therewith; and a multiplexer module in communication with the current sense subsystem for detecting voltages across the load module and generating a pair of voltage signals in accordance therewith, one with the load coupled across the battery and one without the load coupled across the battery; and a level shifting, filtering and amplification subsystem responsive to said multiplexer module and said current sense subsystem, that; filters said voltage signals to reduce a bandwidth of each said voltage signal, to thus produce reduced bandwidth voltage signals; level shifts said reduced bandwidth voltage signals to produce level shifted voltage signals; and amplifies said level shifted voltage signals to produce a pair of modified voltage signals, and wherein said modified voltage signals form an amplified portion of a voltage step of said level shifted voltage signal as said battery recovers after said load has been applied to said battery. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for measuring an internal resistance of a battery, the method comprising:
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applying a load across a pair of terminals of said battery; sensing a current flowing through said load and generating a sensed current signal in accordance therewith; measuring a change in voltage across said battery to produce a while the load is applied across the battery and while the load is released from the battery, to generate a pair of voltage signals; filtering said voltage signals to produce reduced bandwidth voltage signals; level shifting the reduced bandwidth voltage signals to produce shifted voltage signals; amplifying the shifted voltage signal to produce amplified voltage signals; and using the amplified voltage signals and said sensed current signal to calculate said internal resistance of said battery.
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Specification