Patent · US Active

Protective circuit arrangement

US8134810B2 · kind B2 · utility

1Cited by

2References

5Claims

0Family size

Assignee

ABB TECHNOLOGY AG · CH

Inventors

Yannick Maret · Dättwil, CH
Daniel Schrag · Bellinzona, CH
Richard Bloch · Goldau, CH
Harald U. Mueller · Fulda, DE

Key dates

Filing date	Dec 2, 2009
Grant date	Mar 13, 2012
Priority date	—
Expiry date	Sep 9, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH02H9/008
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A protective circuit arrangement is disclosed for electrical equipment supplied, for example, from a conductor loop in surroundings subject to explosion hazards in process engineering installations. To suppress current flow from an energy store of the electrical equipment into the conductor loop, an exemplary cascadeable switchgear cell is disclosed, having a first transistor, which allows the loop current to pass, and a second transistor, which short-circuits a parasitic base-emitter diode of the first transistor.

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