IMPROVEMENT STUDY OF EMI ANALYSIS IN DC-DC BUCK CONVERTER USING RCD-RLD SNUBBER NETWORK

• Main Author: MUHAMAD, MAJIDAH
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2006
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://utpedia.utp.edu.my/7010/1/2006%20-%20IMPROVEMENT%20STUDY%20OF%20EMI%20ANALYSIS%20IN%20DC-DC%20BUCK%20CONVERTER%20USING%20RCD-RLD%20SNUBBER%20NETWORK.pdf; http://utpedia.utp.edu.my/7010/

This project will cover the study in EMI analysis of integrated RCD and RLD type of snubber network in a 100W50 kHz buck converter. The purpose of this study is to improve the efficiency and to reduce the EMI conducted emission in the circuit. A comparison of EMI conducted emission and efficiency in buck converterwith various snubbers is included. In this paper, the integratedRCD and RLD snubber circuit is effectively reduce the EMI conducted emission. However, the efficiency of the circuit is still at low level. To improve the efficiency of this circuit, a combination of synchronous rectifier, parallel Schottky diode and integrated RCD and RLD type of snubber network is proposed. The desired results are not achieved because the proposed component is not available in PSPICE library. Another alternative is presented by increasing the load resistor. From this method, the efficiency of the circuit with integrated RCD and RLD snubber after improvement is 2.63% higher than the converter without snubber and 1.92% higher than the converter with RCD+RLD snubber before improvement. For EMI, the circuit after improvement could reduce 6.14 dBuV less than the circuit without snubber and 0.88 dBuV less than the circuit before improvement.