The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2006
Filed:
Oct. 07, 2003
Tommy Skiba, East Hartford, CT (US);
David D. Jayne, Manchester, CT (US);
Paul A. Grubb, Somers, CT (US);
Rishi Grover, Vernon, CT (US);
Timothy M. Remmers, New Hartford, CT (US);
Wesley E. Sedlacek, Jr., South Windsor, CT (US);
Tommy Skiba, East Hartford, CT (US);
David D. Jayne, Manchester, CT (US);
Paul A. Grubb, Somers, CT (US);
Rishi Grover, Vernon, CT (US);
Timothy M. Remmers, New Hartford, CT (US);
Wesley E. Sedlacek, Jr., South Windsor, CT (US);
UTC Fuel Cells, LLC, South Windsor, CT (US);
Abstract
An auxiliary load () for a fuel cell stack () is alternatively connected and disconnected from the fuel cell external circuit () by a switch () in response to a switch control (), repetitively, during startup and shutdown. The switch may be an insulated gate bipolar transistor () which is turned on and off by hunting between an upper limit voltage () and a lower limit voltage (), which may be performed by compare circuits (), by the controller (), or by commercially available voltage responsive hysteresis switches. Schedules of duty cycle as a function of cell stack voltage for startup () and shutdown () control a pulse width modulator () which operates the switch. Controls () may limit the modulation so that the auxiliary load does not overheat, in response to temperature () of the load or a voltage/power model (). The auxiliary load may comprise a heater in a water accumulator (), an air intake () or an enthalpy recovery device ().