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Mr. Moo-Hyun Park
KAIST (Korea Advanced Institute of Science and Technology)

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0 Electrical Engineering
0 Renewable energies
0 Electrical & Electronics Engineering
0 Power electronic
0 Switch Mode Power Supply

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Journal article
Published: 25 January 2021 in Energies
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This paper presents a modified power factor correction (PFC) ON/OFF control and three-dimensional (3D) printed circuit board (PCB) design for a high-efficiency and high-power density onboard charger (OBC). By alternately operating one of two boost modules of the PFC stage at a 50% or less load condition, the proposed PFC control can reduce the load-independent power loss of the PFC stage, such as core loss and capacitor charging loss of switches. It enables OBCs to have high efficiency across a wide output power range and better thermal performance. The 3D-PCB design decouples a trade-off relationship of the PCB trace design and heat spreader design, increasing the power density of OBCs. A 3.3 kW prototype composed of an interleaved totem-pole bridgeless boost PFC converter and full-bridge (FB) LLC converter has been built and tested to verify the proposed PFC control and 3D-PCB effectiveness design. The prototype has 95.7% full power efficiency (98.2% PFC stage efficiency) and 52 W/in3 power density.

ACS Style

Jaeil Baek; Moo-Hyun Park; Taewoo Kim; Han-Shin Youn. Modified Power Factor Correction (PFC) Control and Printed Circuit Board (PCB) Design for High-Efficiency and High-Power Density On-Board Charger. Energies 2021, 14, 605 .

AMA Style

Jaeil Baek, Moo-Hyun Park, Taewoo Kim, Han-Shin Youn. Modified Power Factor Correction (PFC) Control and Printed Circuit Board (PCB) Design for High-Efficiency and High-Power Density On-Board Charger. Energies. 2021; 14 (3):605.

Chicago/Turabian Style

Jaeil Baek; Moo-Hyun Park; Taewoo Kim; Han-Shin Youn. 2021. "Modified Power Factor Correction (PFC) Control and Printed Circuit Board (PCB) Design for High-Efficiency and High-Power Density On-Board Charger." Energies 14, no. 3: 605.

Journal article
Published: 27 February 2020 in IEEE Transactions on Power Electronics
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An LLC resonant converter is widely used due to the low voltage stress and zero-voltage-switching (ZVS) capability. The LLC resonant converter should operate in the inductive region due to the ZVS operation. For the stable ZVS operation, a sufficient margin of the maximum operation gain should be guaranteed because the theoretical peak voltage gain analysis is not well-matched with the experimental peak gain. Therefore, it is hard to use the peak gain of the LLC resonant converter. As a result, to satisfy enough hold-up time, there are many side-effects such as a large link capacitor and an unoptimized design for high efficiency. This letter proposes a new hold-up time extension method for the LLC resonant converter which can use the peak gain without margin by detecting the accurate peak gain point. By using the proposed method, the hold-up time can be extended, and the link capacitor can be reduced for high power density. The feasibility of the proposed structure is confirmed with a 500 W prototype.

ACS Style

Moo-Hyun Park; Yeonho Jeong; Ronald A. L. Rorrer; Dongmin Choi; Gun-Woo Moon. Hold-Up Time Extension Method for LLC Resonant Converter by Detecting Operation Region. IEEE Transactions on Power Electronics 2020, 35, 9949 -9952.

AMA Style

Moo-Hyun Park, Yeonho Jeong, Ronald A. L. Rorrer, Dongmin Choi, Gun-Woo Moon. Hold-Up Time Extension Method for LLC Resonant Converter by Detecting Operation Region. IEEE Transactions on Power Electronics. 2020; 35 (10):9949-9952.

Chicago/Turabian Style

Moo-Hyun Park; Yeonho Jeong; Ronald A. L. Rorrer; Dongmin Choi; Gun-Woo Moon. 2020. "Hold-Up Time Extension Method for LLC Resonant Converter by Detecting Operation Region." IEEE Transactions on Power Electronics 35, no. 10: 9949-9952.

Journal article
Published: 25 September 2019 in IEEE Transactions on Industrial Electronics
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A totem-pole bridgeless power factor correction rectifier with the soft-switching capability is proposed in this paper. The proposed converter utilizes an inrush current limiter (ICL) circuit, which is applied to satisfy the inrush current limit requirement to achieve the soft-switching of main switches for high efficiency so that high efficiency can be achieved by accomplishing ZVS operation. It can also relieve the reverse recovery problem of main switches, and minimize the soft-switching circuit by integrating the ICL circuit. Besides, the validity of the proposed converter is performed by the experimental results of a prototype converter with 100-240 $V_{AC}$ universal-line input and 800 W (400 V/2 A) output.

ACS Style

Yeonho Jeong; Moo-Hyun Park; Gun-Woo Moon. High-Efficiency Zero-Voltage-Switching Totem-Pole Bridgeless Rectifier With Integrated Inrush Current Limiter Circuit. IEEE Transactions on Industrial Electronics 2019, 67, 7421 -7429.

AMA Style

Yeonho Jeong, Moo-Hyun Park, Gun-Woo Moon. High-Efficiency Zero-Voltage-Switching Totem-Pole Bridgeless Rectifier With Integrated Inrush Current Limiter Circuit. IEEE Transactions on Industrial Electronics. 2019; 67 (9):7421-7429.

Chicago/Turabian Style

Yeonho Jeong; Moo-Hyun Park; Gun-Woo Moon. 2019. "High-Efficiency Zero-Voltage-Switching Totem-Pole Bridgeless Rectifier With Integrated Inrush Current Limiter Circuit." IEEE Transactions on Industrial Electronics 67, no. 9: 7421-7429.

Journal article
Published: 01 May 2019 in IEEE Transactions on Power Electronics
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In the no load condition, LLC converter usually fails to regulate its output voltage although it operates at a high switching frequency. Till now, it is hard to obtain the exact relationship between design parameters and the maximum switching frequency for no load regulation capability. In this paper, a specific criterion for no load regulation of LLC converter is provided, without using active components or other modulation schemes. By analyzing the macroscopic switching period and microscopic switching transition in the no load condition, it is shown that not only the peaking resonant current during the switching transition, but also the resonant tank design affect the no load regulation of LLC converter affect the no load regulation capability. Furthermore, the relationship among design parameters are analyzed and design guideline is also provided to achieve no load regulation at the specified maximum switching frequency. To verify the effectiveness of the proposed design, 400V input and 50V/200W output prototype is built and tested.

ACS Style

Jong-Woo Kim; Moo-Hyun Park; Byoung-Hee Lee; Jih-Sheng Lai. Analysis and Design of LLC Converter Considering Output Voltage Regulation Under No-Load Condition. IEEE Transactions on Power Electronics 2019, 35, 522 -534.

AMA Style

Jong-Woo Kim, Moo-Hyun Park, Byoung-Hee Lee, Jih-Sheng Lai. Analysis and Design of LLC Converter Considering Output Voltage Regulation Under No-Load Condition. IEEE Transactions on Power Electronics. 2019; 35 (1):522-534.

Chicago/Turabian Style

Jong-Woo Kim; Moo-Hyun Park; Byoung-Hee Lee; Jih-Sheng Lai. 2019. "Analysis and Design of LLC Converter Considering Output Voltage Regulation Under No-Load Condition." IEEE Transactions on Power Electronics 35, no. 1: 522-534.

Journal article
Published: 29 April 2019 in IEEE Transactions on Power Electronics
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In photovoltaic applications, many previous researches have focused on pulse width modulation (PWM) resonant converters in order to achieve a high efficiency with a wide input voltage range. Conventional approaches utilized symmetric boosting modulation at the secondary side rectifier to obtain a symmetric operation, and they utilized two boosting modes in a switching period. Among various rectifier structures, the voltage doubler structure has a strong advantage due to a small number of components. However, it suffers from serious hard switching losses in the secondary side rectifier. In this paper, a new converter with a novel asymmetrical modulation is proposed and verified. The strong point of the proposed converter is that it eliminates hard switching turn on losses from the rectifier, while maintaining the minimized number of components. Although the proposed converter adopts an asymmetric modulation, the offset current on the transformer becomes zero inherently. Furthermore, a “forced half resonance” operation of the proposed converter keeps RMS current stresses at the same level as conventional converter although it has a higher peak current. Accordingly, the proposed converter achieves a superior efficiency with the minimum number of components at 35–25V input and 380V/300W output specification.

ACS Style

Jong-Woo Kim; Moo-Hyun Park; Jung-Kyu Han; Moonhyun Lee; Jih-Sheng Lai. PWM Resonant Converter With Asymmetric Modulation for ZVS Active Voltage Doubler Rectifier and Forced Half Resonance in PV Application. IEEE Transactions on Power Electronics 2019, 35, 508 -521.

AMA Style

Jong-Woo Kim, Moo-Hyun Park, Jung-Kyu Han, Moonhyun Lee, Jih-Sheng Lai. PWM Resonant Converter With Asymmetric Modulation for ZVS Active Voltage Doubler Rectifier and Forced Half Resonance in PV Application. IEEE Transactions on Power Electronics. 2019; 35 (1):508-521.

Chicago/Turabian Style

Jong-Woo Kim; Moo-Hyun Park; Jung-Kyu Han; Moonhyun Lee; Jih-Sheng Lai. 2019. "PWM Resonant Converter With Asymmetric Modulation for ZVS Active Voltage Doubler Rectifier and Forced Half Resonance in PV Application." IEEE Transactions on Power Electronics 35, no. 1: 508-521.

Journal article
Published: 19 February 2019 in IEEE Transactions on Power Electronics
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ACS Style

Moo-Hyun Park; Jaeil Baek; Yeonho Jeong; Gun-Woo Moon. An Interleaved Totem-Pole Bridgeless Boost PFC Converter with Soft-Switching Capability Adopting Phase-Shifting Control. IEEE Transactions on Power Electronics 2019, 34, 10610 -10618.

AMA Style

Moo-Hyun Park, Jaeil Baek, Yeonho Jeong, Gun-Woo Moon. An Interleaved Totem-Pole Bridgeless Boost PFC Converter with Soft-Switching Capability Adopting Phase-Shifting Control. IEEE Transactions on Power Electronics. 2019; 34 (11):10610-10618.

Chicago/Turabian Style

Moo-Hyun Park; Jaeil Baek; Yeonho Jeong; Gun-Woo Moon. 2019. "An Interleaved Totem-Pole Bridgeless Boost PFC Converter with Soft-Switching Capability Adopting Phase-Shifting Control." IEEE Transactions on Power Electronics 34, no. 11: 10610-10618.

Journal article
Published: 19 September 2018 in IEEE Transactions on Power Electronics
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In the standby stage of a server power supply, the flyback converter has been widely used due to its simple structure and low cost. However, since the flyback converter suffers from high voltage stress and a large transformer, it degrades the efficiency and power density of the server power supply. To relieve these drawbacks, this paper proposes a new standby structure where a flyback converter is integrated with a boost PFC converter. The proposed standby structure can relieve the high voltage stress and eliminate the large transformer of the conventional flyback converter because the primary side of the flyback converter is merged with the boost PFC converter. Thus, the proposed structure can achieve high efficiency and high power density in the standby stage. Furthermore, it can help the boost PFC converter achieve a soft switching operation, which results in a high-efficiency PFC stage. As a result, the proposed structure improves the overall efficiency and power density of the server power supply. The validity of the proposed structure is confirmed by a prototype with $100-240V_{rms}$ AC input, 750W PFC output, and 12V/2A standby output.

ACS Style

Jae-Il Baek; Jae-Kuk Kim; Jae-Bum Lee; Moo-Hyun Park; Gun-Woo Moon. A New Standby Structure Integrated With Boost PFC Converter for Server Power Supply. IEEE Transactions on Power Electronics 2018, 34, 5283 -5293.

AMA Style

Jae-Il Baek, Jae-Kuk Kim, Jae-Bum Lee, Moo-Hyun Park, Gun-Woo Moon. A New Standby Structure Integrated With Boost PFC Converter for Server Power Supply. IEEE Transactions on Power Electronics. 2018; 34 (6):5283-5293.

Chicago/Turabian Style

Jae-Il Baek; Jae-Kuk Kim; Jae-Bum Lee; Moo-Hyun Park; Gun-Woo Moon. 2018. "A New Standby Structure Integrated With Boost PFC Converter for Server Power Supply." IEEE Transactions on Power Electronics 34, no. 6: 5283-5293.