International Journal of Power Electronics and Drive System (IJPEDS) Vol. 11, No. 4, December 2020, pp. 1844~1856 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v11.i4.pp1844-1856  1844 Journal homepage: http://ijpeds.iaescore.com An improved zero-voltage zero-current transition boost converter employing L-C-S resonant network Anandh N. 1 , Akhilesh Sharma 2 , Julius Fusic S. 3 , Ramesh H. 4 1 Department of Electrical and Electronics Engineering, Manipal Institute of Technology, Manipal Academy of Higher, India 2 Department of Electrical Engineering, North Eastern Regional Institute of Science and Technology, India 3,4 Department of Mechatronics Engineering, Thiagarajar College of Engineering, India Article Info ABSTRACT Article history: Received Dec 6, 2019 Revised Mar 18, 2020 Accepted May 19, 2020 An improved zero-voltage zero-current transition boost converter (IZVZCTBC) is introduced. This converter is basically a fourth-order DC- DC converter wherein a L-C-S (Inductor–Capacitor–Switch) resonant circuit is embedded for soft-switching. L-C-S tank network is the modified version of conventional ZVZCT switch cell. The main feature of L-C-S tank circuit is to enhance the performance of zero-voltage zero-current transition boost converter in terms of eliminating the high current stress, decreasing the switching losses and increasing the efficiency of converter. This converter exhibits both zero-voltage turn on and zero-current turn off switching characteristics based on the gating signals applied to switches. The principle of operation and time domain expressions of IZVZCT boost converter with L-C-S cell are presented. For the closed loop operation, digital controller is designed and the performance of the controller has been validated through simulation for different line and load variations. The mathematical and theoretical analysis is verified accurately by a 12-24 V, 30 W converter through PSIM simulation software and the results ensures that overall efficiency of the converter has improved to 97% along with elimination of current stress. Keywords: Digital controller High current stress Improved zvzct boost converter L-C-S resonant network Soft-switching This is an open access article under the CC BY-SA license. Corresponding Author: Anandh N., Department of Electrical and Electronics Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal - 576104, Karnataka, India. Email: anandh.n@manipal.edu 1. INTRODUCTION Modern era deals with new power electronic technologies to satisfy the needs and requirements of industries. High frequency DC-DC converters are predominantly utilized to serve industrial needs. Converters with high frequency has more advantages compared to low frequency operations, increased frequency provides large power density, quick response, reduction in physical size, cost and weight of reactive elements. Besides these merits, it also offers demerits such as high switching losses and stress, poor efficiency and electromagnetic interference noise. These difficulties can be rectified with soft-switching technologies and they are of mainly four types, i) Zero-Voltage Switching, ii) Zero-Current Switching, iii) Zero-Voltage Transition, iv) Zero-Current Transition. Among the four, first two switching techniques mainly deals with increasing efficiency and reducing the losses but it does not account on switch stress, but the second two transition techniques provides high efficiency, reduced losses and switch stress. Apart from the