Simulation Analysis of Resonant Converters Pendyala Sravani, M.Tech student, Power Electronics, VNRVJIET, Hyderabad. R.Geshma Kumari , Assistant Professor, EEE, VNRVJIET, Hyderabad. Abstract— The conflict between high frequency and switching losses is always observed. Power converters that operate near high frequencies suffers from high switching losses that results into low efficiency. There is one key to this ,which nothing but replacement of switch with the resonating switch. The paper spotlights the performance analysis for various resonant converters which helps in choosing an appropriate resonant converter pertaining to an application. Index Terms— High efficiency, High frequency, Resonant Converter, Output regulation. I. INTRODUCTION Power electronics simply is an art of efficiently converting and conditioning electric power using electronic switches. However ,it is tough [1]. To retrieve an efficient conversion of electrical energy two forms of converters are available, They are pulse width modulated (PWM) converters and resonant converters. The traditional switch-mode power converters are mostly “hard switched”. These converters give controlled output voltage including change in width of gate. At end of switching cycle there will be stress on switch , resulting steep switching loss in the device. protecting circuit is a prerequisite, which complicates circuit . power converters that run at greater frequencies are preferable, as high frequency operating condition reduces the circuit components size. But , it also rises switching losses which in turn affects efficiency. To avoid this ,the switch of SMPS must be of replaced with "resonant switch" , which generates required shape of output waveform ,by exploiting the resonances of capacitances , inductances of circuit in a fashion that there will not be any voltage, current at switch during its operation The rapid improvement in semi conductor devices has pointed out the invention of switching devices like MOSFET. They can reduce the bulk nature of power supply systems. The energy impairment in a switch can be described by two terms they are switching losses and conduction losses .The losses during on time are conduction losses. These depend on on-state voltage depilation. .As the name itself suggests that the losses during switching are switching losses , these also vary from one converter to other as they differ from topography. Some of the losses create stresses to power semiconductors which in long term may affect power supply reliability. Appropriate picking of switches can reduce these inimical effects. For this one must the characteristics of switches, such as: 1)conduction capacity during on-time, 2) Acceptable reverse voltage, 3) switching characteristics, 4) price. By considering these facts many circuit topographies are proposed. one among them is resonant converters .Resonant converters, have both switching and resonant circuits. Natural properties of resonant circuit depresses switching losses. so, resonant topographies gathered the attention of researchers. In RC resonating circuit will be composed by inductors and capacitors ,leading to zero switching current at on ,off instants, known as ZCS. so, the switching will be considerably reduced, thereby making switching frequency larger. The possible large switching frequency not only depends on switch ,but it also relays on control strategy , gating circuits and Appropriate picking of circuit components. The resonant converters are categorized as below. II .CLASSIFICATION OF RESONANT CONVERTERS Fig. 1. Classification of Resonant Converter International Journal of Applied Engineering Research ISSN 0973-4562 Volume 13, Number 10, 2018 (Special Issue) © Research India Publications. http://www.ripublication.com Page 130 of 135