公开(公告)号：US12044735B2

公开(公告)日：2024-07-23

申请号：US17231390

申请日：2021-04-15

Applicant: SMA Solar Technology AG

Inventor： Steffen Aust ,  Martin Putz

IPC: G01R31/327 ,  G01R27/20 ,  G01R31/52

CPC classification number: G01R31/3277 ,  G01R27/205 ,  G01R31/52

Abstract: A method for measuring insulation resistance in an inverter that has a DC link circuit and a bridge circuit, connected to the DC link circuit, for driving an AC current via a bridge center tap is disclosed. The method includes connecting the bridge center tap to a grounding point, successively connecting, by way of the bridge circuit, the bridge center tap that is connected to the grounding point to two points of the ungrounded DC link circuit that differ in terms of voltage, and measuring the current flowing from the two points that differ in terms of voltage to the grounding point. The two points of the ungrounded DC link circuit that differ in terms of voltage are selected from a group of points that includes at least one intermediate voltage point of the DC link circuit in addition to two end points of the DC link circuit, such that the voltages present between the two points that differ in terms of voltage and the grounding point do not exceed a predefined voltage limit value.

公开(公告)号：US20210231735A1

公开(公告)日：2021-07-29

申请号：US17231390

申请日：2021-04-15

Applicant: SMA Solar Technology AG

Inventor： Steffen Aust ,  Martin Putz

IPC: G01R31/327 ,  G01R27/20 ,  G01R31/52

Abstract: A method for measuring insulation resistance in an inverter that has a DC link circuit and a bridge circuit, connected to the DC link circuit, for driving an AC current via a bridge center tap is disclosed. The method includes connecting the bridge center tap to a grounding point, successively connecting, by way of the bridge circuit, the bridge center tap that is connected to the grounding point to two points of the ungrounded DC link circuit that differ in terms of voltage, and measuring the current flowing from the two points that differ in terms of voltage to the grounding point. The two points of the ungrounded DC link circuit that differ in terms of voltage are selected from a group of points that includes at least one intermediate voltage point of the DC link circuit in addition to two end points of the DC link circuit, such that the voltages present between the two points that differ in terms of voltage and the grounding point do not exceed a predefined voltage limit value.