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

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.