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NTIS 바로가기電磁波技術 : 韓國電磁波學會誌 = The Proceedings of the Korean Institute of Electromagnetic Engineering and Science, v.30 no.1, 2019년, pp.29 - 38
김지성 (수원과학대학교)
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
SMPS는 무엇인가? | SMPS는 선형 레귤레이터와는 다르게 스위치 소자를 이용하여 전압을 조정하는 시스템이다. 따라서 스위칭 동작에 의한 빠른 di/dt 또는 dv/dt에 의한 고주파 잡음이 발생하고, 연결된 케이블이나 PCB 또는 시스템 샤시를 통해서 전도되거나 방사되어 전자파 문제를 일으키고 있다. | |
높은 스위칭 주파수의 장점은 무엇인가? | 기본적으로 낮은 주파수가 전자파 측면에서는 유리하나, 최근 제품의 소형화 및 경량화가 필요한 분야에서는 스위칭 주파수를 높여주어야 하므로 MHz 이상의 스위칭 주파수를 사용하고 있다. 소형화라는 장점 외에 높은 스위칭 주파수 사용은 피드백 제어 루프의 BW(Bandwidth)를 높여주고, 출력의 과도 응답 특성이 좋아지는 장점이 있으나, 스위칭 주파수의 고조파 또는 스위치 Turn-on 또는 Turn-off 시에 발생하는 노이즈로 EMI(Electromagnetic Interference)나 RFI(Radio-frequency Interference) 문제가 더욱 주목되고 있다. 또한, 자동차나 스마트폰과 같은 제품에서는 DC-DC 컨버터에 의한 노이즈로 안테나 수신감도 저하 등의 문제도 꾸준히 발생하고 있다[1]-[3] | |
DC-DC 컨버터가 모듈 또는 반도체 내부로 이동한 이유는 무엇인가? | 최근 또 하나의 기술변화로서 PCB에 위치하던 DC-DC 컨버터가 모듈 또는 반도체 내부로 이동하고 있다. DC-DC 컨버터와 부하인 반도체 사이에서 발생하는 기생성분을 우회할 수 있다는 장점과 반도체 내부의 저전력 설계를 위한 전원관리 등의 장점이 있어서 On-package 또는 On-chip DC-DC 컨버터로 발전하고 있다. 반면, DC-DC 컨버터 중 전자제품에서 가장 많이 사용하는 컨버터는 Step-down 컨버터인 Syn- chronous Buck 컨버터이고, PWM(Pulse Width Modulation) 방식을 주로 사용하고 있어서 이러한 컨버터를 반도체 내부에 이동하기에는 인덕터와 같은 수동소자의 크기 문제로 구현에 현실적인 문제들이 있다. |
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