NOVELTY - The device has a jet pump (16) directly connected to an inlet of a fuel cell stack (30). The pump supplies and recirculates hydrogen into the fuel cell stack. A proportional control solenoid valve (40) is connected to a hydrogen supply line (12) and fluidly communicates with an inlet of a nozzle (26) to control the hydrogen supply to the pump. A valve controller controls operation of the valve in a low power section based on an amount of power requested from a fuel cell system using a pulse flow control process, where current power is lesser than a predetermined reference power in the section.    USE - Device for controlling hydrogen supply of a fuel cell system that is utilized as an electricity generation system for generating electric power to a vehicle. Uses include but are not limited to a motor vehicle e.g. passenger car, sport utility vehicle (SUV), bus and lorry, a watercraft e.g. boat and ship, an aircraft, a hybrid vehicle, an electric vehicle, a plug-in hybrid electric vehicle and a hydrogen-driven vehicle.    ADVANTAGE - The valve controller controls the operation of the valve in the low power section based on the amount of the power requested from the fuel cell system using the pulse flow control process, where the current power is lesser than the predetermined reference power in the section, thus enabling a sufficient level of hydrogen recirculation flow even in lower power fuel application conditions in an ejector utilizing recirculation system without utilizing a blower.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for controlling hydrogen supply of a fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of a device for controlling hydrogen supply of a fuel cell system, with a jet pump and a solenoid valve.'(Drawing includes non-English language text)'    Hydrogen supply line (12)    Jet pump (16)    Nozzle (26)    Fuel cell stack (30)    Proportional control solenoid valve (40)