Abstract- This paper deals with the design, analysis and simulation of ZVS controlled non-isolated converter. The prominence of this topology is to diminish the conduction losses and complexity of the circuit. The non-isolated converter used as DC-DC converter is suitable for low and medium power application. The aspire of this work is to build up the blocks of Simulink ZVS controlled non-isolated DC to DC converter. The 48V DC voltage is stepped down to 12V DC. The switches in this proposed topology is operated under ZVS condition to decrease the switching loss. The Non-isolated DC-DC ZVS Converter is modeled using Simulink and the simulation results are presented. Keywords- Closed Loop Control, Non-isolated Converter and ZVS. I. INTRODUCTION NCLUSION of power electronic converter is getting increased because of increased applications such as Industrial equipment, Household appliances, Motor drives, Tractions, Switched power supplies etc.High power density is an everlasting topic on power electronics. The effective way to improve power density is to increase switching frequency. In order to rise the switching frequency, the switching loss should be reduced at first. The fast switching power semiconductor devices, such as MOSFET or IGBT are used as they have less switching losses, small in size, lower in cost and as higher efficiency. Moreover, due to the limited energy storage capability of batteries, the efficiency requirement for DC/DC converter in UPS systems [1] will be high. Thus, the study on the soft-switching push-pull converter has become more and more essential. DC-DC converter with soft-switching operation with high power and isolated bi-directional operation is given in [2]. Advanced applications in power electronics such as renewable energy systems, high-frequency systems require incredible increase or decrease in voltage ratio is given in [3]. This absurd change in voltage ratio will make the duty ratio to exceedingly high or low. The operation using small duty cycle in buck converter cases influences the steady state and transient state performance. Mrs. S. Devikala is PhD Student, Sathyabama University, India. Email: devisamiu@gmail.com. Dr.P.NirmalKumar is working as an Assistant Professor in Anna University, India. This small duty cycle reduces the efficiency of power as well as characteristics of transients with the small pulse width [4].Simulation and experimental verifications of soft switched DC to DC converter is given by Lui [5]. ZV/ZC resonant push-pull converter is given by Mori [6]. The autotransformer is replaced by the tapped inductor. Furthermore, copper loss is less because of one winding in autotransformer than that of an isolation-type transformer [7]. Though, there are some disadvantage like higher voltage stress and increased EMI due to leakage inductance and parasitic capacitance .These problems avert the use of tapped inductor for the best solution for intense variation of ratio applications. The conventional critical conduction mode buck converter that has a ZVS operation extended by the tapped-inductor turn ratios [8]. High efficiency DC to DC converter with high voltage gain and reduced switching stress is given by Wai [9]. DC to DC converter is energy storing interfacing in fuel cell hybrid vehicles is given by Vacca [10]. High efficiency parallel port regulator for wide range input DC to DC converter is given by Wang [11].A bidirectional DC to DC converter for low power application is given by Jain [12]. To overcome the drawbacks this topology has been proposed which reduces the switching losses, complexity of the circuit, minimize EMI and increase efficiency. The circuit model for closed loop control of ZVS resonant converter is developed using simulation The above literature does not deal with Simulink modeling of closed loop controlled DC to DC converter. This work proposes a model for closed loop DC to DC converter. In this paper, zero-voltage switching buck converter with the tapped-inductor is proposed. Fig. 1 Block diagram of non-isolated converter Modeling and simulation of closed loop controlled ZVS Non-isolated DC to DC Converter S. Devikala, and P.Nirmalkumar I DC power supply Non-isolated converter Load Pulse amplifier Microcontroller 2nd International Conference on Power and VLSI Engineering (ICPVE'2013) August 25-26, 2013 Kuala Lumpur (Malaysia) 54