Conversion of solar to electrical energy

Claim 1

A sun powered generator comprising: photovoltaic cell means; means for changing the spectral characteristics of sun rays to better match the response function of said photovoltaic cells means, so that more of the photon energy absorbed by the photovoltaic cell means is used to generate electricity and less of such absorbed photon energy merely heats the photovoltaic cell means, comprising: a black body which when heated will radiate a black body spectrum of photon energy having a good spectral match with the spectral response of the photovoltaic cell means; and reflector means for collecting sun rays and concentrating them on said black body, to heat and cause it to radiate a black body spectrum of photon energy; said photovoltaic cell means being spaced from said black body to receive radiated photon energy from said black body and convert it to electrical energy; wall means defining a chamber and including a window for receiving concentrated sun rays from the reflector means; wherein the black body is located within said chamber and the photovoltaic cell means are mounted in said chamber; reflecting means behind said photovoltaic cell means for reflecting that portion of the radiated energy which is emitted from said black body but not absorbed by said photovoltaic means, including that energy transmitted through the cells, back to the black body to help maintain its temperature; said wall means including a generally parabolic portion having a window at its apex for receiving concentrated sun rays from the reflector means, and a wall portion opposite the apex on which the photovoltaic cell means are mounted, with the generally parabolic portion of the wall means having a mirrored inner surface, and with said black body being located generally at the focus of the mirror surface, so that radiant energy from the black body received by the mirror surface will be reflected by it to the photovoltaic cell means.