Patent · US Active

Frequency converter with DC link capacitor and method for pre-charging the DC link capacitor

US9318969B2 · kind B2 · utility

3Cited by

14References

17Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Reinhold Dillig · Memmelsdorf, DE
Hubert Schierling · Erlangen, DE
Thomas Schwinn · Herzogenaurach, DE

Key dates

Filing date	Jun 28, 2013
Grant date	Apr 19, 2016
Priority date	—
Expiry date	Nov 9, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH02M5/458
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A frequency converter has an AC-DC converter and an inverter interconnected via a DC link having a first and a second circuit branch interconnected by a DC link capacitor and a commutation capacitor. To protect the AC-DC converter from damage caused by an overcurrent, the first circuit branch includes a choke in which a capacitor-side terminal is connected to a terminal of the DC link capacitor and a switch-side terminal is connected via a semiconductor switch to a DC link terminal of the AC-DC converter and also via a freewheeling diode to the second circuit branch. The semiconductor switch is configured to control a magnitude of an electric current flowing from the AC-DC converter into the DC link capacitor in accordance with a control signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.