公开(公告)号：US10468969B2

公开(公告)日：2019-11-05

申请号：US15382037

申请日：2016-12-16

Applicant: GRUNDFOS HOLDING A/S

Inventor： Jan Knudsen ,  Niels Høgholt Petersen

IPC: H02M1/32 ,  H02M7/04 ,  H02H9/00

Abstract: An electronic circuit (1), in particular DC-link circuit, has a high side DC voltage level, an input and an output, the electronic circuit comprising a DC-link capacitor (4), an inrush circuit (3), for limiting an input current to a predetermined level, connected between a supply line (6) of the DC-link capacitor and the input. The inrush circuit includes a charge resistor element (Rc), a switch element (9), connected in parallel with the charge resistor element, and a control (7, 8) controlling the switch element. The control is adapted to turn the switch element on when the input current falls below a predetermined current level. The control includes a trigger control element (8) adapted to detect a differential voltage across the switch element and to turn the switch element off when the detected differential voltage rises above a predetermined threshold voltage. A method is provided for operating the electronic circuit (1).