ELECTRICITY DETECTING SYSTEM AND METHOD HAVING A VERIFYING MECHANISM FOR VERIFYING MEASURED ELECTRICITY VALUES

• US 20100036623A1
• Filed: 08/05/2009
• Published: 02/11/2010
• Est. Priority Date: 08/06/2008
• Status: Abandoned Application

• Current Assignee: National Taiwan University (Government of The Republic of China)
• Original Assignee: National Taiwan University (Government of The Republic of China)
• Inventors: TZOU, Jyh-Hwa, SU, Kuo-Lan, LUO, Ren-Chyuan
• Application Number:
  US12/535,758
• Publication Number:
  US 20100036623A1
• Time in Patent Office: Days
• US Class Current: 702/60
• CPC Class Codes: G01R 35/04 of instruments for measuring time integral of power or current

Abstract

An electricity detecting system includes a detector module operable to generate a plurality of source electricity values of a target electricity value, and a computing unit coupled to the detector module and receiving the source electricity values therefrom. The detector module includes a plurality of detectors, and each of the source electricity values is obtained using a respective one of the detectors. The computing unit is configured to determine weight values corresponding to the source electricity values while taking into account accuracy of the latter, and to determine a verified electricity value corresponding to the target electricity value from the source electricity values and their weight values. The computing unit is further configured to exclude the source electricity values corresponding to the detectors that have experienced breakdown from determination of the verified electricity value.

Claims

1. An electricity detecting method comprising:

a) receiving a plurality of source electricity values of a target electricity value, each of the source electricity values being obtained using a respective detector;

b) determining a threshold value and a weight value for each of the source electricity values;

c) selecting one of the source electricity values as a to-be-verified value;

d) selecting another one of the source electricity values as a to-be-compared value;

e) adding a predetermined value to the weight value of the to-be-verified value when an absolute value of a difference between the to-be-verified value and the to-be-compared value is smaller than an absolute value of a sum of the threshold values of the to-be-verified value and the to-be-compared value;

f) repeating step e) using yet another one of the source electricity values as the to-be-compared value until all of the source electricity values other than that selected as the to-be-verified value in step c) have been selected as the to-be-compared value;

g) repeating steps d) to f) using another one of the source electricity values as the to-be-verified value until all of the source electricity values have been selected as the to-be-verified value; and

h) determining a verified electricity value corresponding to the target electricity value based upon a quotient of a summation of products of each of the source electricity values and the weight value corresponding thereto, and a summation of the weight values of the source electricity values.

2. The electricity detecting method as claimed in claim 1, further comprising, between step g) and step h),

i) determining from the weight values if at least two of the detectors corresponding to at least two of the source electricity values have experienced breakdown, proceeding to step j) if the determination is affirmative, and proceeding to step h) if otherwise,

j) determining which ones of the detectors have experienced breakdown, and

k) repeating steps b) to g) while excluding the source electricity values and the weight values corresponding to the detectors that have experienced breakdown.

3. The electricity detecting method as claimed in claim 2, wherein the weight value determined in step b) has an initial value of 0, and the determination made in step i) is affirmative if the weight values are each non-zero and less than a product of one-half of a total number of the detectors and the predetermined value added in step e).

4. The electricity detecting method as claimed in claim 2, wherein the determination made in step i) is affirmative if each of the weight values is equal to an initial value thereof as determined in step b).

5. The electricity detecting method as claimed in claim 2, wherein step j) includes:

computing an average of previously determined verified electricity values;

computing a difference between each of the source electricity values and the average; and

for each of the source electricity values whose difference with the average is greater than the threshold value thereof, determining that the detector corresponding thereto has experienced breakdown.

6. The electricity detecting method as claimed in claim 1, wherein the threshold value determined in step b) ranges from 5% to 10% of the source electricity value.

7. The electricity detecting method as claimed in claim 1, wherein each of the detectors is one of a voltage detector and a current detector.

8. The electricity detecting method as claimed in claim 1, wherein each of the source electricity values is obtained through processing of a measuring electrical signal of the respective detector, the processing including amplifying the measuring electrical signal to result in an amplified electrical signal.

9. The electricity detecting method as claimed in claim 8, wherein the processing of the measuring electrical signal further includes adjusting level of the amplified electrical signal to result in an adjusted voltage signal, and converting the adjusted voltage signal into digital form to result in the source electricity value.

10. The electricity detecting method as claimed in claim 9, wherein the adjusted voltage signal ranges from 0V to 5V.

11. The electricity detecting method as claimed in claim 1, further comprising, between step a) and step b), excluding the source electricity value that exceeds a predetermined safety reference value such that the verified electricity value determined in step h) is not affected thereby.

12. An electricity detecting system comprising:

a detector module including a plurality of detectors, said detector module being operable to generate a plurality of source electricity values of a target electricity value, each of the source electricity values being obtained using a respective one of said detectors; and

a computing unit coupled to said detector module and receiving the source electricity values therefrom, said computing unit being configured to perform a method including the steps

a) determining a threshold value and a weight value for each of the source electricity values,

b) selecting one of the source electricity values as a to-be-verified value,

c) selecting another one of the source electricity values as a to-be-compared value,

d) adding a predetermined value to the weight value of the to-be-verified value when an absolute value of a difference between the to-be-verified value and the to-be-compared value is smaller than an absolute value of a sum of the threshold values of the to-be-verified value and the to-be-compared value,

e) repeating step d) using yet another one of the source electricity values as the to-be-compared value until all of the source electricity values other than that selected as the to-be-verified value in step b) have been selected as the to-be-compared value,

f) repeating steps c) to e) using another one of the source electricity values as the to-be-verified value until all of the source electricity values have been selected as the to-be-verified value, and

g) determining a verified electricity value corresponding to the target electricity value based upon a quotient of a summation of products of each of the source electricity values and the weight value corresponding thereto, and a summation of the weight values of the source electricity values.

13. The electricity detecting system as claimed in claim 12, wherein each of said detectors is one of a voltage detector and a current detector.

14. The electricity detecting system as claimed in claim 12, wherein each of said detectors outputs a measuring electrical signal from which the corresponding source electricity value is obtained, said detector module further including a plurality of amplifier circuits coupled respectively to said detectors for amplifying the measuring electrical signals to result in amplified electrical signals, respectively.

15. The electricity detecting system as claimed in claim 14, wherein said detector module further includes:

a plurality of adjusting circuits coupled respectively to said amplifier circuits for adjusting levels of the amplified electrical signals to result in adjusted voltage signals, respectively; and

an analog-to-digital converter coupled to said adjusting circuits for converting each of the adjusted voltage signals into digital form to result in the corresponding source electricity value.

16. The electricity detecting system as claimed in claim 15, wherein each of the adjusted voltage signals ranges from 0V to 5V.

17. The electricity detecting system as claimed in claim 12, wherein said detector module further includes a comparator circuit for indicating to said computing unit the source electricity value that exceeds a predetermined safety reference value, said computing unit being configured to exclude the source electricity value that exceeds the predetermined safety reference value from determination of the verified electricity value.

18. The electricity detecting system as claimed in claim 12, wherein the method further includes, between step f) and step g),

h) determining from the weight values if at least two of said detectors corresponding to at least two of the source electricity values have experienced breakdown, proceeding to step i) if the determination is affirmative, and proceeding to step g) if otherwise,

i) determining which ones of said detectors have experienced breakdown, and

k) repeating steps a) to f) while excluding the source electricity values and the weight values corresponding to said detectors that have experienced breakdown.

19. The electricity detecting system as claimed in claim 18, wherein step i) includes:

computing an average of previously determined verified electricity values;

computing a difference between each of the source electricity values and the average; and

for each of the source electricity values whose difference with the average is greater than the threshold value thereof, determining that said detector corresponding thereto has experienced breakdown.

20. The electricity detecting system as claimed in claim 12, wherein said processing unit is a single-chip microprocessor.