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The circuit principle and harmonic characteristics of peak current mode Boost converter are analyzed, the voltage loop and the current loop are adopted to keep the input current in the same phase with the input voltage. A novel harmonic suppression technology with quasi-square wave compensation is presented in this paper, The input current harmonic components and harmonic contents are reduced by compensating the input reference current to quasi-square wave, Quasi-square wave compensation circuit is designed, and circuit simulation is carried on with Saber software, and harmonic spectrums of the input current are analyzed also. The result indicates that harmonic components of the input current in the compensated circuit are within the harmonic components limitation for IEC 61000-3-2, and the ideal harmonic suppression effect is achieved. The compensation circuit is easy to be realized, it have the advantages of high performance and low cost and is suitable for small-wattage switching power supply.

Based on the multiplication of dynamic eigenvalue coefficient and its dynamic stabilizing capability, fast-scale instability and its asymmetry in power factor correction (PFC) Boost converter with continuous peak current control mode are investigated. To realize higher power factor and less harmonic distortion, a kind of compensation strategy is proposed to make the input current a sinusoidal wave, and it is optimized with parameter resonance. The formulas are deduced,and the overall optimization is carried out. The results of digital simulation shows that the overall compensating strategy has the most powerful dynamic ability to ensure the quick stabilization during every stroboscopic period, and the fast-scale instability is controlled, and the approximate unit power factor and the best compensating effects are obtained finally, resulting in the increase of the conversion efficiency of PFC Boost converter.

The bifurcation and chaos should exist in Boost converter while the circuit stability conditions are not satisfied，and the stable state could not be gotten by its self control power. As a kind of OGY method without feedback，the parameter resonance can control the bifurcation and chaos in Boost converter. Based on current controlled Boost circuit，the regulating process and its control power are discussed with the reference value of inductor current as the resonant parameter，and the characteristic parameters in the stable state are also deduced in detail. The control power of parameter resonance with different resonant voltages and the stable characteristic parameters are analyzed for the bifurcation and chaos circuits，so as to realize the precise design of circuit parameters and ensure the Boost converter to work steadily and reliably.