Method for limiting damage to a converter having power semiconductors in the case of a short circuit in the DC voltage intermediate circuit

US8570779B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Mike Dommaschk · Guteborn, DE
• Jörg Dorn · Buttenheim, DE
• Ingo Euler · Erlangen, DE
• Jörg Lang · Stadtsteinach, DE
• Quoc-Buu Tu · Roßtal, DE
• Klaus Würflinger · Koblenzer Straße, DE

Key dates

• Filing date: Mar 13, 2007
• Grant date: Oct 29, 2013
• Expiry date: Nov 4, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M7/4835
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A device for converting an electric current has a phase module, which in turn has an alternating current connection and at least one direct current connection connected to an intermediate direct current circuit. The device further has an energy accumulator. A phase modulation path is formed between each direct current connection and each alternating current connection. Each phase modulation path has a series connection of submodules, which each have a power semiconductor. A semiconductor protective device is provided in parallel connection to power semiconductors of each submodule. A control unit actuates the semiconductor protective device, and energy accumulator(s) are equipped for supplying energy to the control unit. The device safely prevents damage from a short circuit on the direct-current side, even when the supply grid is connected, because a direct current connection of each phase module is connected to the intermediate direct current circuit via a direct-current switch.