Analysis and design of harmonic suppression circuit with quasi-square wave compensation

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.