• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.2072-2074
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• 1997

A new low-cost high power factor correction circuit for electronic ballasts is proposed. The proposed circuit provides good power factor correction, low current harmonic distortion and cost-effectiveness. The prototype meets the IEC555-2 requirements satisfactorily with nearly unity power factor.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.151-152
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• 2012

본 논문은 전기자동차의 탑재형 충전기 (OBC, On-Board Charger)에 적용 가능한 고효율 역률개선회로 (PFC, Power Factor Correction Circuit)들의 손실을 분석한다. 평균전류모드제어를 이용하여 conventional boost PFC, interleaved boost PFC, semi-bridgeless PFC, totem pole PFC, seudo totem pole PFC, back-to-back bridgeless PFC, interleaved bridgeless PFC 등 7개의 토폴로지를 3.3kW OBC 기반으로 설계하고, 각 토폴로지의 손실을 수식과 PSIM의 thermal module을 이용하여 분석한다. 분석한 결과를 토대로 제시한 토폴로지들의 효율 및 성능을 비교한다.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.704-708
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• 2004

Recently, many nation have released standard such as IEC 61000-3-2 and IEEE 59, which impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC Line. Therefore, Plasma Display Panel (PDP) which is highlightened in digital display device also has the Power Factor Correction (PFC) circuit to meet the harmonic requirements. In PDP power module, the conventional boost converter is usually used for the PFC circuit. However, it comes serious thermal problem on it's bridge diode due to heat of PDP, and therefore the system stability is not guaranteed. In this paper, the bridgeless boost converter, which is used for PFC circuit of the PDP power module, is designed and verified the possibility of the application in a practical product in a view of efficiency, component count, temperature and etc.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2001.11a
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• pp.107-111
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• 2001

This paper presents a detailed analysis method of the universal input forward converter with LC input filter operating in discontinuous capacitor voltage mode(DCVM) for wind power generation. In this analysis, condition for DCVM operation and conversion ratio for rectified sinusoidal input are made clear. To verify the validity of the analysis, simulation is carried out for the universal input ranging from 90 $V_{rms} to 260 V_{rms}$

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.41-42
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• 2010

본 논문에서는 대면적 플라즈마 사인 보드 제어를 위한 저소비 전력용 인버터를 개발하였다. 이 인버터는 215*86mm 사이즈로 인가전압 220V, 출력전압 1200V, 스위칭 주파수 20KHz, 소비전력 50W 급인 인버터를 역률개선회로 PFC(Power Factor Correction)를 적용하여 리플을 줄이고 안정적인 전압 공급, 전체 전류 정격감소, 회생전압 상승분 억제, 유니버설 입력범위에서 동작 가능하게 만들었다. 고전압트랜스를 4개를 집적화 하였으며 전력 소비 전류가 감소되면서 온도가 상승되는 것을 막을 수 있었고 전자파도 줄일 수 있음을 보였다.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.12
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• pp.7-12
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• 2008

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.744-748
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• 2002

This paper describes a power supply of a CW magnetron for driving a electrodeless plasma lamp. The proposed power supply consists of a power factor controller, a series resonant ZVS half bridge inverter, a high voltage leakage transformer, and two IGBT drives. From the simulation results, it was confirmed that the proposed circuits can control the input power of the magnetron up to 33.3[%] linearly by adjust driving frequency of the inverter.

• Proceedings of the KIEE Conference
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• summer
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• pp.1214-1216
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• 2004

Conventional Switched Mode Power Supplies(SMPS) with diode-capacitor rectifier have distorted input current waveform with high harmonic contents. Typically, these SMPS have a power factor lower than 0,65. To improve with this problem the power factor correction(PFC) circuit of power supplies has to be introduced. PFC circuit have tendency to be applied in new power supply designs. The input active power factor correction circuits can be implemented using either the two-stage or the single-stage approach. In this paper, the comparative analysis of power factor correction circuit using feedforward control with average current mode single-stage flyback method converter and two-stage converter which is combination of boost and flyback converter. The two prototypes of 50W were designed and tested a laboratory experimental. Also, the comparative analysis is confirmed by simulation and experimental results.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.3
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• pp.226-232
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• 2005

Recently, many nation have released standard such as IEC 61000-3-2 and IEEE 59, which impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC Line. Therefore, Plasma Display Panel(PDP) which is highlightened in digital display device also has the Power Factor Correction(PFC) circuit to meet the harmonic requirements. In PDP power module, the conventional boost converter is usually used for the PFC circuit. However, it comes serious thermal problem on it's bridge diode due to heat of PDP, and therefore the system stability is not guaranteed. In this paper, the bridgeless boost converter, which is used for PFC circuit of the PDP power module, is designed and verified the possibility of the application In a practical product in a view of efficiency, component count, temperature and etc.

• Journal of the Korean Society for Precision Engineering
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• v.27 no.4
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• pp.14-19
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• 2010

In this paper, using interleaved power factor correction how to improve the inverter efficiency studied. Interleaved method can reduce the conduction losses and the inductor energy. Generally, critical conduction mode (CRM) boost PFC converter used low power level because of the high peak currents. if you use the interleaved mode, CRM PFC can be used medium or high power application. interleaved CRM PFC can reduce current ripple for higher system reliability and size of buck capacitor and EMI filter size. Interleaved CRM PFC that is installed in front of inverter can maintain the constant voltage regardless of the input voltage.