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CrM Totem-Pole PFC의 외란 및 부하 변동 발생 시 EN61000-3-2 규율을 만족시킬 수 있는 고조파 주입 제어 알고리즘
지민우,박해찬,김래영 대한전기학회 2024 전기학회논문지 Vol.73 No.1
Since the PFC(Power Factor Correction) converter is used in various applications, it is necessary to develop a control algorithm suitable for the operating characteristics of various demands. Among them, when harmonics are injected into current commands to improve performance, especially in CrM(Critical conduction Mode) control PFCs, disturbances at the input stage are likely to exceed the total harmonic regulation (EN61000-3-2). In this paper, we propose a harmonic injection control algorithm that can be controlled by feeding back the magnitude of each order of harmonics to comply with total harmonic regulation when a disturbance occurs at the input stage or the size of the load fluctuates during operation. By using the Fourier series principle, the harmonic size of each order is sensed in real time and compared and controlled through the P&O(Perturbation & Observation) algorithm, harmonic control of each order is possible in a simple way. The proposed control technique was applied to a 350W Totem-Pole PFC converter to verify the validity of the proposed content.
최세환,백민우,조경석,최창락,지영희 대한신경외과학회 1990 Journal of Korean neurosurgical society Vol.19 No.7
We reported a case of huge cystic trigeminal neurinoma. The patient was 35 year old female with trigeminal nerve dysfunction and hemiparesis. The computed tomography disclosed a huge cystic low density mass at the temporal base and suprasellar cistern that extended to cerebellopontine cistern through the tentorium, and enlargement of Meckel's cave on coronal scan. Through the infratemporal and retromastoid suboccipital approach, the cystic content was aspirated and cyst wall was removed. The cystic change of neurinoma may be due to mucoid degeneration and liquifaction.
전신수,나형균,지철,박춘근,조경근,이상원,백민우,이길송,송진언,강준기,최창락 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.12
The authors report 17 cases of tuberculum sellar meningioma(TSM) operated on in our university hospitals for recent 7 years. Most of the patients were between 40 and 60 years. and women predominated in all age group. Visual symptom was the most common admitting complaint Most of the patients underwent operatiom with bifrontal or pterional approach. Recently, in 3 cases of large sue tumors, we used extensive transbasal approach and orbitozygomatic infratemporal approach. In 5 patients, total removal was not possible because of the tightly adhesion to the neighboring vital structure and cavernous sinus invasion. Surgical results were good in 11 patients. fair in 2, poor in 1 and 3 patients were died. Visual outcome improved in 6 patients. unchanged in 5 and worsened in 3. Partial resection rate was low and overall outcome better in patients with tumors 3cm or less in size. In 3 cases of large size tumors operated with extensive transbasal or orbitozygomatic infratemporal approach. overall outcome was good in all cases. A series of 17 patients of TSM is presented.