출력 커패시터 특성 분석을 통한 포워드 DC/DC 컨버터 보상 회로 설계

Abstract

In these days, high switching technology is required to obtain fast output transient response and small size DC/DC converter. So the conventional aluminum electrolytic capacitor is being replaced by tantalum capacitor and MLCC(multi-layer ceramic capacitor). To obtain optimal and stable operational characteristics of DC/DC converter, controller design method considering characteristics of tantalum capacitor and MLCC is necessary. In this paper, we compare and analyze different characteristics between tantalum capacitor and MLCC. We also propose a controller design method to make the DC/DC converter stable even under different operating conditions, and prove its effectiveness through simulation and experimental results. In particular we implemented 50W forward DC/DC converter and thereby verified the controller design method through frequency domain response and transient response.