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단상 Three-level boost converter의 역률개선
오정언(Jeong-Eon Oh),서영조(Young-Jo Sea),조성민(Seong-Min Cho),박종찬(Jong-Chan Park),전희종(Hee-Jong Jean) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, Power factor correction circuit of single-phase three-level boost converter is proposed. The advantage of the proposed control scheme for three-level boost converter are low blocking voltage of each power device, low THD(Total Harmonic Distortion) and high power factor. The control scheme is based on the current comparator, capacitor compensator and region detector. In simulations, the proposed system is validated.
전희종,서영조,오정언,김병진 崇實大學校 1999 論文集 Vol.29 No.1
The existing equipment with wire communication can expect the stability of data transmission. However, according to increasing a number of Measuring Instruments, wiring work becomes a heavy burden. Restriction to application about portable Measuring Instruments and the lack of flexibility are another drawback of wire communication. This paper presents the scheme of the design and implementation of a RF(Radio Frequency) based module. The RF based module is designed to the multi communication between Measuring Instruments. The RF based module consists of RF circuit and microprocessor. The main properties of RF circuit are maximum 5[Kbps] transmission rate, maximum 90m transmission distance and 433[MHz] frequency band. The microprocessor rearrange the data into AHDLC(Advanced High level Data Link Control) format and then instructs RF circuits to transmit/receive the data. The RF module is expacted to have a wide application field such as fire/security alarm, remote control/measurement etc..