Patent · US Active

Method and apparatus for ground fault detection

US9793854B2 · kind B2 · utility

4Cited by

13References

20Claims

0Family size

Assignee

Enphase Energy, Inc. · US

Inventors

Martin Fornage · Petaluma, US
Michael J. Harrison · Petaluma, US

Key dates

Filing date	Sep 30, 2015
Grant date	Oct 17, 2017
Priority date	—
Expiry date	Sep 30, 2035

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E10/50
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Method and apparatus for determining a ground fault impedance. In one embodiment the apparatus comprises a voltage divider and a ground fault detection module for (i) determining a first voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the first AC line and the DC line; (ii) determining a second voltage based on at least one voltage measurement of the voltage divider while the voltage divider is coupled between the second AC line and the DC line; (iii) determining a differential voltage based on at least one voltage measurement between the first AC line and the second AC line; and (iv) computing the ground fault impedance based on the first voltage, the second voltage, and the differential voltage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.