홍예선 2024-01-12T16:02:22Z 2024-01-12T16:02:22Z 1996-10-10 https://pubs.kist.re.kr/handle/201004/90904 교류발전기용　정전압　제어　정류회로 Patent 1996-10-10 1993-04-14 105934 93-6245 KO 특허 한국과학기술연구원