부스트 정류기의 고역률 제어에 관한 연구

Abstract

The boost converter operating at the boundary of continuous conduction mode(CCM) and discontinuous conduction mode(DCM) in the inductor output current of the converter has been commonly and widely used as one of the power stable control devices.

This converter can achieve the power factor correction by minimizing the harmonic distortion in the input current of the circuit.

This paper examines an advanced boost converter based on the above proto-type converter to obtain more stable and constant DC power source.

In order to compose the converter, first of all, a filtering capacitor is added across the output of the bridge rectifier

this capacitor is to filter the high-frequency switching noise so that the voltage reference for the control circuit is a clean sinusoidal wave, and a switching control circuit to decrease the harmonic distortion is connected.

Furthermore, optimum parameter values to minimize the harmonic distortion in the input current are derived from the analyses of switching characteristics, switching on-off time and switching frequency.

Based on the analyses, a simulation using the PSim was done and a 100[W] step-up converter was designed and fabricated. As a result, it has been found that the power factor of 14[%] was improved compared to the proto-type boost converter.