System and method for estimating an efficiency of a power device

Patent metadata

Field	Value
Publication number	US-9231439-B2
Application number	US-41264509-A
Country	US
Kind code	B2
Filing date	Mar 27, 2009
Priority date	Mar 27, 2009
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

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.

First claim

What is claimed is:

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.

2. The method of claim 1 , wherein the power device is an uninterruptible power supply.

3. The method of claim 2 , wherein the state of operation is one of a trim mode, a single boost mode, a double boost mode and a green mode.

4. The method of claim 2 , wherein determining the estimated operating efficiency includes determining estimated power losses from a look-up table.

5. The method of claim 4 , wherein determining the estimated operating efficiency further includes calculating an estimated input power by adding a current load and the estimated power losses.

6. The method of claim 4 , wherein determining the battery charging power includes measuring the battery charging power when the battery is not fully charged.

7. The method of claim 6 , wherein calculating the estimated input power includes adding the battery charging power, if any.

8. The method of claim 7 , wherein calculating the estimated input power further includes adding other losses associated with the uninterruptible power supply, if any.

9. The method of claim 1 further comprising determining whether the power device is in a mode in which no losses are calculated.

10. The method of claim 1 further comprising displaying the estimated operating efficiency.

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:
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.

12. The method of claim 11 , wherein the power device is an uninterruptible power supply.

13. The method of claim 12 , wherein the state of operation is one of a trim mode, a single boost mode, a double boost mode and a green mode.

14. The method of claim 12 wherein determining the battery charging power includes measuring the battery charging power when a battery of the uninterruptible power supply is not fully charged.

15. The method of claim 14 , wherein calculating the estimated input power includes adding the battery charging power, if any.

16. The method of claim 14 , wherein calculating the estimated input power further includes adding other losses associated with the uninterruptible power supply, if any.

17. The method of claim 12 further comprising determining whether the uninterruptible power supply is in a mode in which no losses are calculated.

18. The method of claim 12 further comprising displaying the estimated operating efficiency.

19. A power device comprising:
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.

20. The power device of claim 19 , wherein the power device is an uninterruptible power supply.

21. The power device of claim 20 , wherein the state of operation is one of a trim mode, a single boost mode, a double boost mode and a green mode.

22. The power device of claim 21 , wherein the stored procedure is further configured to determine the battery charging power by measuring the battery charging power when the a battery of the uninterruptible power supply is not fully charged.

23. The power device of claim 20 wherein the stored procedure is further configured to calculate the estimated input power by adding the battery charging power, if any.

24. The power device of claim 23 , wherein the stored procedure is further configured to calculate the estimated input power by adding other losses associated with the uninterruptible power supply, if any.

25. The power device of claim 20 , wherein the stored procedure is further configured to determine whether the uninterruptible power supply is in a mode in which no losses are calculated.

26. The power device of claim 19 further comprising a display to display the estimated operating efficiency.

27. An uninterruptible power supply comprising:
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, coupl

Assignees

• Deokar Vishwas Mohaniraj
• Spitaels James S
• Rodenhiser Fred W
• Schultz Lynn Ernest
• Brookshire Kyle
• Schneider Electric It Corp

Inventors

• Deokar Vishwas Mohaniraj
• Spitaels James S
• Rodenhiser Fred W
• Schultz Lynn Ernest
• Brookshire Kyle

Classifications

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• Y10T307/625

  Cross-Sectional Technologies · mapped topic

• G01R31/40

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• H02J9/061 Primary

  for DC powered loads · CPC title