Determining battery capacity
First Claim
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1. A power supply system comprising:
- three power supply units, each of the power supply units comprising a direct current (DC) output connected to an electrical load; and
three backup battery units, each of the backup battery units being controllable to output DC power to an associated one of the power supply units at a respective controlled rate;
a control unit configured to;
selectively cause each of the power supply units to draw a constant DC power from the associated backup battery unit during a respective period of time to partially discharge the associated backup battery unit, generate a respective varying DC power from a combination of the constant DC power from the associated backup battery unit and a respective varying AC power from a power source and supply the respective varying DC power to the electrical load; and
estimate a respective total capacity of each of the backup battery units based on a total energy discharged by the respective backup battery unit during the respective period of time and output voltage of the respective backup battery unit during the respective period of time.
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Abstract
Methods and related systems conduct a capacity check of a battery via a partial discharge cycle. A method of estimating a total capacity of a battery includes partially discharging the battery at a controlled discharge rate so as to discharge an amount of energy from the battery over a period of time. An output voltage of the battery is measured during the period of time. A total capacity of the battery is estimated based on the amount of energy discharged from the battery during the partial discharge cycle and the output voltage of the battery measured during the partial discharge cycle.
12 Citations
19 Claims
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1. A power supply system comprising:
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three power supply units, each of the power supply units comprising a direct current (DC) output connected to an electrical load; and three backup battery units, each of the backup battery units being controllable to output DC power to an associated one of the power supply units at a respective controlled rate; a control unit configured to; selectively cause each of the power supply units to draw a constant DC power from the associated backup battery unit during a respective period of time to partially discharge the associated backup battery unit, generate a respective varying DC power from a combination of the constant DC power from the associated backup battery unit and a respective varying AC power from a power source and supply the respective varying DC power to the electrical load; and estimate a respective total capacity of each of the backup battery units based on a total energy discharged by the respective backup battery unit during the respective period of time and output voltage of the respective backup battery unit during the respective period of time. - View Dependent Claims (2, 3, 4, 5)
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6. A power supply system comprising:
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a backup battery unit; a power supply unit comprising a direct current (DC) output connected to an electrical load; and a control unit configured to; control the power supply unit to draw a controlled DC power from the backup battery unit during a period of time to partially discharge the backup battery unit generate a varying DC power from a combination of the controlled DC power from the backup battery unit and a varying alternating current (AC) power from an AC power source and supply the varying DC power to the electrical load; and estimate a total capacity of the backup battery unit as a function of total energy discharged by the backup battery unit during the period of time and an output voltage of the backup battery unit during the period of time. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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controlling a power supply unit to; draw an amount of electrical energy from a battery over a period of time to partially discharge the battery at a controlled discharge rate, output a varying direct current (DC) power to a load; and generate the varying DC power output to the load by the power supply unit from a combination of the amount of energy drawn from the battery over the period of time and a varying alternating current (AC) power from an AC power source; measuring an output voltage of the battery during the period of time; and estimating a total capacity of the battery as a function of the amount of electrical energy and the output voltage. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification