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1. (WO2003054993) FUEL CELL SYSTEM POWER CONTROL METHOD AND SYSTEM

Pub. No.:    WO/2003/054993    International Application No.:    PCT/US2002/040258
Publication Date: Jul 3, 2003 International Filing Date: Dec 18, 2002
IPC: H01M 8/04
H01M 16/00
H02J 9/00
Applicants: ABB RESEARCH LTD.
JUNGREIS, Aaron, M.
Inventors: JUNGREIS, Aaron, M.
Title: FUEL CELL SYSTEM POWER CONTROL METHOD AND SYSTEM
Abstract:
A fuel cell (10’) is placed in parallel with a battery (14’) via a mechanical switch. The voltage is held nearly constant by the battery (14’) and the power flow is controlled by adjusting the fuel cell (10’) operating parameters (such as temperature or air flow) and by opening and closing the mechanical switch. The result is a system that operates at nearly constant voltage without the need for an expensive power conditioning system. The output of the system can then be processed via a traditional conditioning system such as an inverter or dc-to-dc converter without the need for a wide range of input operating voltages. This reduces the cost and size of the fuel cell (10’) power conditioning system.