Chun T. Rim - Academia.edu (original) (raw)

Papers by Chun T. Rim

Research paper thumbnail of Incidence solar power analysis of PV panels with curved reflectors

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), 2017

Power generation using renewable energy is attracting attention in order to secure sustainable an... more Power generation using renewable energy is attracting attention in order to secure sustainable and eco-friendly energy source. Among them, solar power generation market shows rapid growth. However, due to shadows caused by elevation angle variation of the sun according to season, solar panels should be installed with certain distance between each other in succession, which causes wide unused space. To solve this problem, plane-type reflectors are installed between solar panels. In this paper, the curved reflector type is newly proposed, which can increase the intensity of sunlight incident on the solar panel at high elevation angle of the sun. Experimental results showed that the average sunlight intensity ratio with respect to elevation angle of the sun for the solar panels with no reflector, plane-type reflector, and the proposed curved reflector is 1:1.20:1.23, respectively.

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Research paper thumbnail of Application of Phasor Transformation to Static Analyses of LED Drivers

KAIST Research Series, 2016

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Research paper thumbnail of Switched Transformer Model

KAIST Research Series, 2016

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Research paper thumbnail of 7M-OFF-LONG-DISTANCE Extremely Loosely Coupled Inductive Power Transfer Systems Using Dipole Coils

2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014

An extremely loosely coupled inductive power transfer system (IPTS) for 7m-off-long-distance wire... more An extremely loosely coupled inductive power transfer system (IPTS) for 7m-off-long-distance wireless power transfer using dipole coils is proposed. The superiority of dipole coils for a-long-distance power delivery over loop coils with same configuration of square core, in general, is verified by comparing magnetizing inductance between primary and secondary coils. Series-parallel resonant circuits are used to achieve higher load voltage than the series-series scheme. Contrary to conventional IPTSs or coupled magnetic resonance systems, quality factor Q is set as low as 100, which is, moreover, fixed for guaranteeing frequency tolerance. An optimum number of turns of the secondary coil is derived theoretically and verified by experiments, where a prototype of narrow dipole coils with 2m-length were used to deliver 11.1 W power up to 7m-distance at a very low frequency of 20 kHz.

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Research paper thumbnail of Free space wireless charging in cars with fishbone DQ IPT coils

2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC), 2016

A new free space wireless charging system for inner vehicle use with a ferrite-core fishbone arch... more A new free space wireless charging system for inner vehicle use with a ferrite-core fishbone architecture is proposed in this paper. This system achieves wireless charging independent of the position and direction of its receiving side by means of two transmitting coils installed in one ferrite core structure. These direct (D) and quadrature (Q) coils generate a uniform rotating magnetic field inside the vehicle. In the proposed system, a double-sided LCC circuit topology is applied to each of the D and Q coils to provide load-independent current sources. The parameters of the LCC compensation circuits are determined to guarantee zero voltage switching for the switches of the high-frequency inverter and to limit the inverter output current simultaneously. A detail analysis of the operation and design of the proposed system was carried out, and its feasibility was verified with experiments for 1 W level of power receiving within 30 cm distance between transmitting and receiving coils at 280 kHz.

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Research paper thumbnail of ZVZCS Buck Converter with Tapped Inductor and Single SiC Switch

2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia), 2018

The circuit operation analysis for tapped inductor buck converter with single SiC switch based ze... more The circuit operation analysis for tapped inductor buck converter with single SiC switch based zero voltage and zero current switching (ZVZCS) in continuous conduction mode (CCM) is proposed in this paper. The proposed converter enables ZVZCS operation for wide operating ranges of duty cycle, load power, and input voltage by adopting snubber circuit, which consists of two capacitors and three diodes. Its ZVZCS operation does not require cumbersome voltage or current sensing and voltage/current stress of active components does not exceed the order of input voltage. To minimize the time consumed in ZVZCS, SiC MOSFET with short rise and fall time is used as an active switch. A detailed analysis for CCM operation of the converter and its design steps are shown. Experimental verification has been conducted with 300 W prototype with maximum efficiency of 98.4 %.

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Research paper thumbnail of Equivalent-Circuit-Based Design of Symmetric Sensing Coil for Self-Inductance-Based Metal Object Detection

IEEE Access, 2020

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Research paper thumbnail of Single-Variable-Input Active Sidelobe Suppression Method for Synthesized Magnetic Field Focusing Technology and Its Optimization

IEEE Transactions on Industrial Electronics, 2019

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Research paper thumbnail of Novel Dummy Load for 40W Fluorescent Lamps

Journal of Power Electronics, 2012

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Research paper thumbnail of High-Resolution Synthesized Magnetic Field Focusing for RF Barcode Applications

IEEE Transactions on Industrial Electronics, 2017

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Research paper thumbnail of Development of Highly Reliable Power and Communication System for Essential Instruments Under Severe Accidents in NPP

Nuclear Engineering and Technology, 2016

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Research paper thumbnail of Quantum transformation: the analysis of quantum rectifier-inverters

Conference Record of the IEEE Industry Applications Society Annual Meeting

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Research paper thumbnail of A complete DC and AC analysis of three phase current source PWM rectifier using circuit D-Q transformation

PESC `92 Record. 23rd Annual IEEE Power Electronics Specialists Conference

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Research paper thumbnail of Modeling, analysis and control of static VAr compensator using three-level inverter

Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting

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Research paper thumbnail of Novel Roaming and Stationary Tethered Aerial Robots for Continuous Mobile Missions in Nuclear Power Plants

Nuclear Engineering and Technology, 2016

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Research paper thumbnail of Dipole-Coil-Based Wide-Range Inductive Power Transfer Systems for Wireless Sensors

IEEE Transactions on Industrial Electronics, 2016

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Research paper thumbnail of Synthesized Magnetic Field Focusing Using a Current-Controlled Coil Array

IEEE Magnetics Letters, 2016

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Research paper thumbnail of 역률보상형 엘이디 조명장치

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Research paper thumbnail of Filter-free AC direct LED driver with unity power factor and low input current THD using binary segmented switched LED strings and linear current regulator

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013

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Research paper thumbnail of The graphical D-Q transformation of general power switching converters

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting

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Research paper thumbnail of Incidence solar power analysis of PV panels with curved reflectors

2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), 2017

Power generation using renewable energy is attracting attention in order to secure sustainable an... more Power generation using renewable energy is attracting attention in order to secure sustainable and eco-friendly energy source. Among them, solar power generation market shows rapid growth. However, due to shadows caused by elevation angle variation of the sun according to season, solar panels should be installed with certain distance between each other in succession, which causes wide unused space. To solve this problem, plane-type reflectors are installed between solar panels. In this paper, the curved reflector type is newly proposed, which can increase the intensity of sunlight incident on the solar panel at high elevation angle of the sun. Experimental results showed that the average sunlight intensity ratio with respect to elevation angle of the sun for the solar panels with no reflector, plane-type reflector, and the proposed curved reflector is 1:1.20:1.23, respectively.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Phasor Transformation to Static Analyses of LED Drivers

KAIST Research Series, 2016

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Research paper thumbnail of Switched Transformer Model

KAIST Research Series, 2016

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Research paper thumbnail of 7M-OFF-LONG-DISTANCE Extremely Loosely Coupled Inductive Power Transfer Systems Using Dipole Coils

2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014

An extremely loosely coupled inductive power transfer system (IPTS) for 7m-off-long-distance wire... more An extremely loosely coupled inductive power transfer system (IPTS) for 7m-off-long-distance wireless power transfer using dipole coils is proposed. The superiority of dipole coils for a-long-distance power delivery over loop coils with same configuration of square core, in general, is verified by comparing magnetizing inductance between primary and secondary coils. Series-parallel resonant circuits are used to achieve higher load voltage than the series-series scheme. Contrary to conventional IPTSs or coupled magnetic resonance systems, quality factor Q is set as low as 100, which is, moreover, fixed for guaranteeing frequency tolerance. An optimum number of turns of the secondary coil is derived theoretically and verified by experiments, where a prototype of narrow dipole coils with 2m-length were used to deliver 11.1 W power up to 7m-distance at a very low frequency of 20 kHz.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Free space wireless charging in cars with fishbone DQ IPT coils

2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC), 2016

A new free space wireless charging system for inner vehicle use with a ferrite-core fishbone arch... more A new free space wireless charging system for inner vehicle use with a ferrite-core fishbone architecture is proposed in this paper. This system achieves wireless charging independent of the position and direction of its receiving side by means of two transmitting coils installed in one ferrite core structure. These direct (D) and quadrature (Q) coils generate a uniform rotating magnetic field inside the vehicle. In the proposed system, a double-sided LCC circuit topology is applied to each of the D and Q coils to provide load-independent current sources. The parameters of the LCC compensation circuits are determined to guarantee zero voltage switching for the switches of the high-frequency inverter and to limit the inverter output current simultaneously. A detail analysis of the operation and design of the proposed system was carried out, and its feasibility was verified with experiments for 1 W level of power receiving within 30 cm distance between transmitting and receiving coils at 280 kHz.

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Research paper thumbnail of ZVZCS Buck Converter with Tapped Inductor and Single SiC Switch

2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia), 2018

The circuit operation analysis for tapped inductor buck converter with single SiC switch based ze... more The circuit operation analysis for tapped inductor buck converter with single SiC switch based zero voltage and zero current switching (ZVZCS) in continuous conduction mode (CCM) is proposed in this paper. The proposed converter enables ZVZCS operation for wide operating ranges of duty cycle, load power, and input voltage by adopting snubber circuit, which consists of two capacitors and three diodes. Its ZVZCS operation does not require cumbersome voltage or current sensing and voltage/current stress of active components does not exceed the order of input voltage. To minimize the time consumed in ZVZCS, SiC MOSFET with short rise and fall time is used as an active switch. A detailed analysis for CCM operation of the converter and its design steps are shown. Experimental verification has been conducted with 300 W prototype with maximum efficiency of 98.4 %.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Equivalent-Circuit-Based Design of Symmetric Sensing Coil for Self-Inductance-Based Metal Object Detection

IEEE Access, 2020

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Single-Variable-Input Active Sidelobe Suppression Method for Synthesized Magnetic Field Focusing Technology and Its Optimization

IEEE Transactions on Industrial Electronics, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Novel Dummy Load for 40W Fluorescent Lamps

Journal of Power Electronics, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of High-Resolution Synthesized Magnetic Field Focusing for RF Barcode Applications

IEEE Transactions on Industrial Electronics, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development of Highly Reliable Power and Communication System for Essential Instruments Under Severe Accidents in NPP

Nuclear Engineering and Technology, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Quantum transformation: the analysis of quantum rectifier-inverters

Conference Record of the IEEE Industry Applications Society Annual Meeting

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A complete DC and AC analysis of three phase current source PWM rectifier using circuit D-Q transformation

PESC `92 Record. 23rd Annual IEEE Power Electronics Specialists Conference

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modeling, analysis and control of static VAr compensator using three-level inverter

Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Novel Roaming and Stationary Tethered Aerial Robots for Continuous Mobile Missions in Nuclear Power Plants

Nuclear Engineering and Technology, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dipole-Coil-Based Wide-Range Inductive Power Transfer Systems for Wireless Sensors

IEEE Transactions on Industrial Electronics, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Synthesized Magnetic Field Focusing Using a Current-Controlled Coil Array

IEEE Magnetics Letters, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 역률보상형 엘이디 조명장치

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Filter-free AC direct LED driver with unity power factor and low input current THD using binary segmented switched LED strings and linear current regulator

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The graphical D-Q transformation of general power switching converters

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting

Bookmarks Related papers MentionsView impact