Electric power generating lantern using forced air cooled low bandgap photovoltaic cells

Abstract

A compact forced air cooled thermophotovoltaic generator includes a TPV converter assembly, a fan which is driven by electric power generated by the converter assembly and a housing for enclosing the assembly and fan. The assembly includes a fuel/air mixing tube, an infrared emitter positioned in the combustion chamber, a receiver positioned around the emitter and a heat shield positioned between the receiver and the emitter. The receiver includes a circuit having TPV cells connected to an inner surface and radial fins extending from an outer surface. A fuel source may be provided proximate (i.e. beneath) the mixing tube or may be remotely connected to the mixing tube by a fuel line. A housing encloses the TPV converter assembly and the fuel source, if provided as part of the unit. A fan or other updraft mechanism electrically connected to the cell circuit is provided at the bottom of the housing beneath the fuel source and/or converter assembly. The fan blows air upward around the fuel cylinder and mixing tube, along the walls of the housing and past the radial fins of the heat sink, thereby dramatically improving cell cooling and increasing combustion air flow. A chimney and exhaust duct may be provided for carrying exhaust gases generated by the combustion away from the generator. Various features may be added, depending on the intended use of the generator. For portable applications, handles or other carrying means are included on the housing. For stationary applications, wall mounts or plates are provided. Preferably, the housing of the present generator has a construction that provides easy access for replacing depleted fuel sources.