Filter arrangement

US11329544B2 · kind B2 · utility

Assignee

• VACON OY · FI

Inventors

• Stefan Strandberg · Auweg, FI
• Nicklas Södö · Vaasa, FI

Key dates

• Filing date: Nov 13, 2020
• Grant date: May 10, 2022
• Expiry date: Nov 13, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M7/5387
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A filter arrangement in connection with a power converter for transferring power between a multiphase AC voltage network and a DC voltage network. The filter arrangement comprises a differential mode coil coupled between each AC terminal of an inverter bridge and corresponding AC network phase terminal, and a common mode coil coupled between each inverter bridge DC terminal and corresponding DC network terminal. Both inductors are located in the same magnetic core structure such that each of the differential mode winding is wound around its own phase-specific core leg and all common mode windings are wound around their own single core leg. The winding direction of both AC- and DC-side inductor windings is such that a common-mode current which flows along both inductors in the same direction, induces in each magnetic core leg a flux which reinforces the total flux circulating in the magnetic core.