NOVELTY - The circuit has a first output circuit (C01) coupled to a first auxiliary winding (NS1) of a transformer (Tr) for outputting a first output voltage (V01) to a first load unit (38). A second output circuit (C02) is coupled to a second auxiliary winding (NS2) for outputting a second output voltage (Va). A power input terminal (Pin) is connected with an output terminal of the second output circuit to provide a third output voltage (V02) to a second load unit (36), where the third output voltage is a sum of an input voltage i.e. photovoltaic voltage (Vpv) and the second output voltage.    USE - Solar power conversion circuit e.g. half-bridge conversion circuit, two-switch forward converter, or a fly-back converter for use in a solar power converter (all claimed).    ADVANTAGE - The power input terminal is connected with the output terminal of the output circuit so as to provide the output voltage to the load unit, where the output voltage is the sum of the input voltage and another output voltage, thus allowing the converter to have a simplified circuit design, so that a number of overall components decreases, and hence providing superior power conversion efficiency and decreasing overall manufacturing cost. The operating point that corresponds to the output of the maximum power tends not to differ drastically in nature, thus allowing the converter to have maximum solar power track capability. The converter is applicable to both a high voltage load and a low voltage load. The power to be processed by the converter is reduced to simplify circuit configuration. The converter has improved conversion efficiency even when solar power output is affected by environmental conditions such as temperature and illumination, and even during relatively slight voltage variation associated with maximum solar power output.    DETAILED DESCRIPTION - The first load unit is a low voltage load with respect to the second load unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a solar power converter.    Output circuits (C01, C02)    Auxiliary windings (NS1, NS2)    Power input terminal (Pin)    Transformer (Tr)    Output voltages (Va, V01, V02)    Photovoltaic voltage (Vpv)    Load units (36, 38)