Generally non-linear loads are the main source of harmonics. This paper presents one new control scheme to compensate the harmonic current generated by the diode rectifier so as to achieve a power factor nearer to unity and regulate the DC-bus voltage. This scheme uses one Boost Converter, which is connected in shunt with the series diode rectifier to eliminate the harmonic current drawn by the single-phase diode rectifier. The line current command is derived from a dc link voltage regulator and an output power estimator. In absence of diode rectifier (Non-linear Load), the boost converter draws purely sinusoidal current from source. In presence of diode rectifier the boost converter takes current in such a way that the total current drawn by the diode rectifier load from source becomes purely sinusoidal. Advantages of these boost converters include higher power ratings, simple control techniques, less harmonic control contents, nearly unity power factor. Optional principle, design analysis and conditions achieving for the proposed converters are described.