en 2-Industrial Electronics Industrial Electronics Research Paper Research Paper <div style="text-align: justify;"><span style="color:#000000;"><span style="font-family:tahoma;"><span style="font-size:12px;"><span class="headingsandsub-headingsChar">This paper proposes an improved control method based on modified Delta-Sigma Modulator (DSM) to enhance transient response and improve harmonic contents of buck DC-DC converter. The main advantages of the proposed method are improving the output voltage frequency spectrum, correction of the output voltage harmonic contents and sideband harmonics, reduction of switching noise peaks at the output voltage, operating buck converter in continuous current mode independent of load current, significant reduction of inductor current ripple, improving the transient response of buck converter and correction of the input current harmonics. This progress is achieved by applying improved control method based on proposed forgetting function to enhance transient response of buck converter and also by using modified DSM to improve harmonic spectrum of the output voltage and reduce inductor current ripples. The simulation results confirm performance and feasibility of the proposed system.</span></span></span></span></div> Buck Converter,Delta-Sigma Modulation,Forgetting Function,Switching Noise Reduction, 28 36 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-2068-1&slc_lang=en&sid=1 M. Abarzadeh m_abarzadeh@sut.ac.ir 180031947532846006105 180031947532846006105 Yes Renewable Energy and Advanced Power Electronics Research Center, Sahand University of Technology, Tabriz, Iran. F. Eshaghi f.es.hagi@gmail.com 180031947532846006106 180031947532846006106 No Renewable Energy and Advanced Power Electronics Research Center, Sahand University of Technology, Tabriz, Iran. E. Najafi Aghdam najafiaghdam@sut.ac.ir 180031947532846006107 180031947532846006107 No Renewable Energy and Advanced Power Electronics Research Center, Sahand University of Technology, Tabriz, Iran.