Patent · US Expired

Electric dc source

US4407903A · kind A · utility

9Cited by

5References

3Claims

0Family size

Assignees

Siemens Aktiengesellschaft · DE
Ingenieurkontor Lubeck · DE

Inventors

Heinrich Gutbier
Karl Strasser · Erlangen, DE
Elmar Limberg · Lübeck, DE
Volker Jensen · Krummesse, DE

Key dates

Filing date	Nov 12, 1981
Grant date	Oct 4, 1983
Priority date	—
Expiry date	Nov 12, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T90/40
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric dc source with fuel cells or fuel batteries connected in series or in series and parallel, not only gives quiet operation, but does so without a large power electronics system, by providing a separate gas supply to each fuel cell or fuel battery and disposing controllable valves in the gas supply lines and connecting outputs having a given polarity of the series connected fuel cells or fuel batteries to a bus bar of the same polarity via electric valves.

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