System and method for estimating an efficiency of a power device
First Claim
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1. A method for estimating an operating efficiency of a power device coupled to a battery and at least one power source separate from the power device, the method comprising:
- identifying, by a controller of the power device, a state of operation of the power device in which the power device receives input power from the at least one power source and provides output power to a load separate from the power device;
determining battery charging power including power provided to the battery to increase a state-of-charge of the battery;
measuring at least one characteristic related to the output power;
calculating an estimated input power of the power device received from the at least one power source based on the at least one characteristic and the battery charging power; and
determining an estimated operating efficiency of the power device in providing the output power while operating in the state of operation based on output power loss parameters associated with the power device and the estimated input power.
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Abstract
A method for estimating an efficiency of a power device includes identifying a state of operation of the power device, measuring power-related information produced by the power device, and determining an estimated efficiency of the power device based in part on the state of operation of the power device and power loss parameters associated with the power device by using the measured power-related information. Other methods and devices for measuring efficiency are further disclosed.
115 Citations
34 Claims
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1. A method for estimating an operating efficiency of a power device coupled to a battery and at least one power source separate from the power device, the method comprising:
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identifying, by a controller of the power device, a state of operation of the power device in which the power device receives input power from the at least one power source and provides output power to a load separate from the power device; determining battery charging power including power provided to the battery to increase a state-of-charge of the battery; measuring at least one characteristic related to the output power; calculating an estimated input power of the power device received from the at least one power source based on the at least one characteristic and the battery charging power; and determining an estimated operating efficiency of the power device in providing the output power while operating in the state of operation based on output power loss parameters associated with the power device and the estimated input power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for estimating an operating efficiency of a power device coupled to a battery and at least one power source separate from the power device, the method comprising:
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identifying, by a controller of the power device, a state of operation of the power device in which the power device receives input power from the at least one power source and provides output power to a load separate from the power device; determining battery charging power including power provided to the battery to increase a state-of-charge of the battery; measuring at least one characteristic related to the output power; determining estimated losses in the output power while the power device operates in the state of operation based on power loss parameters associated with the power device and the at least one characteristic related to the output power; calculating an estimated input power of the power device received from the at least one power source by adding an output power value determined using the at least one characteristic related to the output power, the battery charging power, and the estimated losses in the output power; and dividing the output power by the estimated input power. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A power device comprising:
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an input to receive input power from at least one power source separate from the power device; a power supply circuit, coupled to the input, to provide power; a battery coupled to the power supply circuit; an output, coupled to the power supply circuit, to provide output power derived from the power supply circuit; and a controller, coupled to the power supply circuit, the controller being configured to retrieve at least one stored procedure corresponding to estimating an operating efficiency of the power device, the stored procedure being configured to; identify a state of operation of the power device in which the power device receives the input power via the input and provides the output power to a load separate from the power device, determine battery charging power including power provided to the battery to increase a state-of-charge of the battery; measure at least one characteristic related to the output power, determine estimated losses in the output power based on the state of operation, power loss parameters associated with the power device, and the at least one characteristic related to the output power, calculate an estimated input power of the power device received from the at least one power source by adding an output power value determined from the at least one characteristic related to the output power, the battery charging power, and the estimated losses in the output power, and divide the output power by the estimated input power. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. An uninterruptible power supply comprising:
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an input to receive input power from at least one power source separate from the uninterruptible power supply; a power supply circuit, coupled to the input, to provide power; a battery coupled to the power supply circuit; an output, coupled to the power supply circuit, to provide output power derived from the power supply circuit; and a controller, coupled to the power supply circuit, the controller being configured to retrieve at least one stored procedure corresponding to estimating an estimated operating efficiency of the uninterruptible power supply by; identifying a state of operation of the uninterruptible power supply in which the uninterruptible power supply receives the input power via the input and provides the output power to a load separate from the uninterruptible power supply, determining battery charging power including power provided to the battery to increase a state-of-charge of the battery; measuring at least one characteristic related to the output power, determining estimated losses in the output power from a look-up table based on the at least one characteristic related to the output power, and calculating an estimated input power of the uninterruptible power supply received from the at least one power source by adding an output power value determined from the at least one characteristic related to the output power, the battery charging power loss, and the estimated losses in the output power. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. An uninterruptible power supply comprising:
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an input to receive input power from at least one power source separate from the uninterruptible power supply; a power supply circuit, coupled to the input, to provide power; a battery coupled to the power supply circuit; an output, coupled to the power supply circuit, to provide output power derived from the power supply circuit; and means for estimating an operating efficiency of the uninterruptible power supply by identifying a state of operation of the uninterruptible power supply in which the uninterruptible power supply receives the input power via the input and provides the output power to a load separate from the uninterruptible power supply, determining battery charging power including power provided to the battery to increase a state-of-charge of the battery, measuring at least one characteristic related to the output power, determining estimated losses in the output power from a look-up table based on the at least one characteristic related to the output power, and calculating an estimated input power of the uninterruptible power supply received from the at least one power source by adding an output power value determined from the at least one characteristic related to the output power, the battery charging power, and the estimated losses in the output power.
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Specification