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DC-DC 컨버터를 이용한 유니버셜모터의 고조파전류 저감에 관한 연구
임홍우(Hong-Woo Lim),박수강(Soo-Kang Park),조금배(Geum-Bae Cho),백형래(Hyung-Lae Baek) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
Universal motors are series field connected commutaot brush type motors commonly used for portable tools and other application. The word universal implies that energization may he either AC or DC, although AC excitation is by far more common and is the case studied here. Phase controled DC drives system gained a high popularity due to their simple implementation despite the disadvantage of their poor input power factor especially for large values of phase delay angle. This paper present the application of a PWM control thechnique to a single-phase DC drive system fed from DC-DC converter and provides and active input power factor correction
SMPS용 고주파 트랜스의 고장의 분석 및 재현시험법에 관한 연구
임홍우(Hong-Woo Lim),이영주(Young-Joo Lee),한지훈(Ji-hun Han) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
In this paper, we describe the failure analysis and representation test method that applied high frequency transformer for SMPS through analysing insulation resistance, frequency characteristic, CT analysis, Q-factor atc. And we study the judgement method that a high frequency transformer affects to other beside parts in different condition or environment. According to this method, we devise a plan for the field failure prevent and propose the securing product reliability of high frequency transformer.
정병호(Byung-Ho Chung),임홍우(Hong-Woo Lim),최연옥(Youn-Ok Choi),조금배(Geum-Bae Cho),백형래(Hyung-Lae Baek),오금곤(Geum-Gon Oh) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
LIM have mall11y different poll1t considering rotary induction motor, that is end effect In this paper described that, end effect, adding to the rotary induction motor They can be designed because of affects magnetizing inductance and series resistance in the d-axis circuit. After LIM modeling, Using<br/> SVPWM, apply to vector control this model. We can verify feasibility of field oriented control technology can control speed by simulation
임성용(Seong-Yong Lim),형재필(Jae-Phill Hyong),임홍우(Hong-Woo Lim),오근태(Geun-Tae Oh) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.1
Purpose: This study has developed the accelerated lifetime test method for smps for outdoor lighting LED through two factors of temperature and humidity. Methods: Acceleration condition was confirmed for each stress and model, and acceleration life test model was estimated according to acceleration condition. Results: As a result of confirming the accelerated life test model, in the case of humidity, acceleration was established only in the foreign products. Therefore, it is confirmed that the acceleration condition is insufficient. However, the estimated parameters for temperature are relatively constant. It is therefore suitable for power supply acceleration tests for outdoor lighting LEDs. Conclusion: The SMPS acceleration test for outdoor lighting LED can improve the availability of the product by developing an accelerated life test method that guarantees the reliability of the product.
히스테리시스 밴드에 따른 직접토오크 제어특성에 관한 연구
최연옥(Youn-Ok Choi),임홍우(Hong-Woo Lim),정삼용(Sam-Yong Jeong),신사현(Sa-Hyun Shin),장용해(Yong-Hae Jang),조금배(Geum-Bae Cho),백형래(Hyung-Lae Baek) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Direct torque control(DTC) of AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement. DTC is also very simple in its implementation because it needs only two hysteresis comparators and switching vector table for both flux and torque control. The amplitude of hysteresis band greatly influences on the drive performance such as flux and torque ripple, switching frequency and current harmonics. Therefore, authors analysis flux and torque hysteresis bands is suggested considering switching frequency and harmonic distortion of currents.