公开(公告)号：US11837964B2

公开(公告)日：2023-12-05

申请号：US17282841

申请日：2019-04-10

Applicant: Danfoss Power Electronics A/S

Inventor： Nicklas Södö ,  Juha Norrena

IPC: H02M5/458 ,  H02M1/32 ,  H02M1/36 ,  G01R31/42 ,  G01R1/42

CPC classification number: H02M5/458 ,  H02M1/32 ,  H02M1/36 ,  G01R1/42

Abstract: A method for detecting low impedance condition at an output (15) of an electrical converter (10), a control unit (1000), a computer program product, and an electrical converter (10) are presented. The method includes determining (110) a first current value (I1(T1)) of a first current (I1), and a second current value (I1(T2)) of the first current (I1), and determining (120) a first current difference (ΔI1) between the first (I1(T1)) and the second (I1(T2)) current values, and comparing (130) the first current difference (ΔI1) to a first current difference threshold (I1_TH), and if the first current difference (ΔI1) is of predefined magnitude with respect to the first current difference threshold (I1_TH), such as higher, turning off (140) a first voltage (U1) driving the first current (I1), such as by switching off a corresponding switch or switches for applying the first voltage (U1) to the output (15).

公开(公告)号：US20210351701A1

公开(公告)日：2021-11-11

申请号：US17282841

申请日：2019-04-10

Applicant: Danfoss Power Electronics A/S

Inventor： Nicklas Södö ,  Juha Norrena

IPC: H02M3/158 ,  H02M1/32 ,  H02M1/00 ,  H02M1/08 ,  H02M1/36

Abstract: A method for detecting low impedance condition at an output (15) of an electrical converter (10), a control unit (1000), a computer program product, and an electrical converter (10) are presented. The method includes determining (110) a first current value (I1(T1)) of a first current (I1), and a second current value (I1(T2)) of the first current (I1), and determining (120) a first current difference (ΔI1) between the first (I1(T1)) and the second (I1(T2)) current values, and comparing (130) the first current difference (ΔI1) to a first current difference threshold (I1_TH), and if the first current difference (ΔI1) is of predefined magnitude with respect to the first current difference threshold (I1_TH), such as higher, turning off (140) a first voltage (U1) driving the first current (I1), such as by switching off a corresponding switch or switches for applying the first voltage (U1) to the output (15).