Method and apparatus for calibrating a measurement device

Patent metadata

Field	Value
Publication number	US-12481015-B2
Application number	US-202318360097-A
Country	US
Kind code	B2
Filing date	Jul 27, 2023
Priority date	Apr 2, 2020
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

Systems, apparatuses, and methods are described for calibration of a current transformer. In some examples, one or more electrical elements may be affected in order to set a calibration of the current transformer. A calibration circuit of the current transformer may be permanently or non-permanently affected according to a calibration code in order to set the calibration of the current transformer. For example, one or more fuses may be burned to lock in a certain configuration of the current transformer.

First claim

The invention claimed is:

1 . An apparatus comprising:
a first circuit configured to adjust a measurement of an alternating current, the first circuit comprising:
a switch located in a first electrical pathway between two terminals of the first circuit, wherein the first electrical pathway is configured to provide an electrical connection between the two terminals of the first circuit when the first electrical pathway is in a closed circuit configuration; and
a first electrical element located in the first electrical pathway between the two terminals of the first circuit; and
a second circuit configured to adjust the measurement of the alternating current, the second circuit comprising:
a fuse located in a second electrical pathway between two terminals of the second circuit, wherein the second electrical pathway is configured to provide an electrical connection between the two terminals of the second circuit when the second electrical pathway is in a closed circuit configuration; and
a second electrical element located in the second electrical pathway between the two terminals of the second circuit;
wherein the second electrical pathway is configured to be set to an open circuit configuration when the fuse is burned, and the fuse of the second circuit is configured to be burned based on the switch of the first circuit being in an open circuit configuration.

2 . The apparatus of claim 1 , wherein the first electrical element is a first resistor, and the second electrical element is a second resistor.

3 . The apparatus of claim 1 , wherein the first electrical element is a first capacitor, and the second electrical element is a second capacitor.

4 . The apparatus of claim 1 , wherein the first circuit is on a first circuit board, and the second circuit is on a second circuit board.

5 . The apparatus of claim 1 , wherein the first circuit is inside a first housing, and the second circuit is inside a second housing.

6 . The apparatus of claim 1 , wherein the fuse is burned based on a calibration code.

7 . The apparatus of claim 1 , further comprising a third electrical pathway with a second switch and a fourth electrical pathway with a second fuse.

8 . The apparatus of claim 7 , wherein the third electrical pathway is connected in parallel with the first electrical pathway, and the fourth electrical pathway is connected in parallel with the second electrical pathway.

9 . The apparatus of claim 7 , wherein the third electrical pathway includes a first resistor and the fourth electrical pathway includes a second resistor.

10 . The apparatus of claim 7 , wherein the third electrical pathway includes a first capacitor and the fourth electrical pathway includes a second capacitor.

11 . The apparatus of claim 7 , further comprising: a first separation electrical element connected between a terminal of the first electrical pathway and a terminal of the third electrical pathway, and a second separation electrical element connected between a terminal of the third electrical pathway and a terminal of the fourth electrical pathway.

12 . The apparatus of claim 11 , wherein the first separation electrical element is a first resistor and the second separation electrical element is a second resistor.

13 . The apparatus of claim 7 , wherein the fourth electrical pathway is configured to be set to an open circuit configuration when the second fuse is burned, and the second fuse is configured to be burned based on the second switch being in the open circuit configuration.

14 . The apparatus of claim 13 , wherein the second fuse is burned based on a calibration code.

15 . The apparatus of claim 13 , wherein the third electrical pathway is on a first circuit board, and the fourth electrical pathway is on a second circuit board.

16 . The apparatus of claim 13 , wherein the third electrical pathway is inside a first housing, and the fourth electrical pathway is inside a second housing.

17 . The apparatus of claim 1 , further comprising a third electrical pathway with a third electrical element and a fourth electrical pathway with a fourth electrical element.

18 . The apparatus of claim 17 , wherein the third electrical element is a first resistor and the fourth electrical element is a second resistor.

19 . The apparatus of claim 17 , wherein the third electrical element is a first capacitor and the fourth electrical element is a second capacitor.

20 . A method comprising:
setting a first electrical pathway in an open circuit configuration by switching a switch to an open circuit configuration, wherein the switch and a first electrical element are connected to each other between two terminals of the first electrical pathway, and wherein the first electrical pathway is configured to provide an electrical connection between the two terminals when the first electrical pathway is in a closed circuit configuration; and setting, by burning a fuse and based on the switch being in the open circuit configuration, a second electrical pathway in an open circuit configuration, wherein the fuse and a second electrical element are connected to each other between two terminals of the second electrical pathway, and the second electrical pathway is configured to provide an electrical connection between the two terminals of the second circuit when the second electrical pathway is in a closed circuit configuration.

Assignees

• Solaredge Technologies Ltd

Inventors

• Braginsky David
• Yairi Dor
• Yoscovich Ilan

Classifications

• G01R19/0092

  Measuring current only · CPC title

• G01R15/186

  using current transformers with a core consisting of two or more parts, e.g. clamp-on type (G01R15/142 - G01R15/16 take precedence; tong testers G01R1/22) · CPC title

• G01R1/22

  Tong testers acting as secondary windings of current transformers · CPC title

• G01R35/005 Primary

  Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence) · CPC title

• G01R35/02 Primary

  of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating · CPC title