The Experts below are selected from a list of 663 Experts worldwide ranked by ideXlab platform
Chulwoo Kim - One of the best experts on this subject based on the ideXlab platform.
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a single inductor 8 channel output dc dc boost converter with time limited power distribution control and single shared Hysteresis Comparator
Asia and South Pacific Design Automation Conference, 2014Co-Authors: Jungmoon Kim, Chulwoo KimAbstract:This paper describes a time-limited power distribution control (TPDC) technique that can be used for single-inductor multiple-output (SIMO) DC-DC converter with many unbalanced loads. Furthermore, the true all-Comparator control technique that raises no stability or complexity issues is proposed. This all-Comparator technique for SIMO converters is realized only with a single shared Hysteresis Comparator at a constant switching frequency of 800 kHz. The maximum efficiency reaches 92%. The fabricated chip with 8-channel outputs occupies 2.4×2.1 mm2 in a 0.35-um CMOS process.
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a single inductor eight channel output dc dc converter with time limited power distribution control and single shared Hysteresis Comparator
IEEE Transactions on Circuits and Systems, 2013Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited power distribution control technique that can be used for single-inductor multiple-output (SIMO) DC-DC converter with many unbalanced loads. Furthermore, the true all-Comparator control technique that raises no stability or complexity issues is proposed. This all-Comparator technique for SIMO converters is realized only with a single shared Hysteresis Comparator at a constant switching frequency of 800 kHz. This leads to the development of a new inductor peak-current control technique that does not require compensators and a phase-locked loop. This converter is analyzed and compared with existing SIMO converters with respect to the requirements of next-generation power management ICs. The maximum efficiency of the converter reaches 92%. The fabricated chip supporting eight-channel outputs is implemented in a 0.35-μm CMOS process and occupies an area of 2.4 × 2.1 mm2.
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a single inductor 8 channel output dc dc boost converter with time limited one shot current control and single shared Hysteresis Comparator
Symposium on VLSI Circuits, 2011Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited one-shot current control technique used to extend the outputs of a single-inductor multiple-output DC-DC converter without stability and complexity issues. The proposed scheme also reliably supports many outputs with unbalanced loads. True all-Comparator control is realized with a single shared Hysteresis Comparator and a fixed switching frequency of 800-kHz. The maximum efficiency reaches 92%. The fabricated 8-channel output chip occupies 2.4×2.1 mm2 in a 0.35-µm CMOS process.
Jungmoon Kim - One of the best experts on this subject based on the ideXlab platform.
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a single inductor 8 channel output dc dc boost converter with time limited power distribution control and single shared Hysteresis Comparator
Asia and South Pacific Design Automation Conference, 2014Co-Authors: Jungmoon Kim, Chulwoo KimAbstract:This paper describes a time-limited power distribution control (TPDC) technique that can be used for single-inductor multiple-output (SIMO) DC-DC converter with many unbalanced loads. Furthermore, the true all-Comparator control technique that raises no stability or complexity issues is proposed. This all-Comparator technique for SIMO converters is realized only with a single shared Hysteresis Comparator at a constant switching frequency of 800 kHz. The maximum efficiency reaches 92%. The fabricated chip with 8-channel outputs occupies 2.4×2.1 mm2 in a 0.35-um CMOS process.
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a single inductor eight channel output dc dc converter with time limited power distribution control and single shared Hysteresis Comparator
IEEE Transactions on Circuits and Systems, 2013Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited power distribution control technique that can be used for single-inductor multiple-output (SIMO) DC-DC converter with many unbalanced loads. Furthermore, the true all-Comparator control technique that raises no stability or complexity issues is proposed. This all-Comparator technique for SIMO converters is realized only with a single shared Hysteresis Comparator at a constant switching frequency of 800 kHz. This leads to the development of a new inductor peak-current control technique that does not require compensators and a phase-locked loop. This converter is analyzed and compared with existing SIMO converters with respect to the requirements of next-generation power management ICs. The maximum efficiency of the converter reaches 92%. The fabricated chip supporting eight-channel outputs is implemented in a 0.35-μm CMOS process and occupies an area of 2.4 × 2.1 mm2.
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a single inductor 8 channel output dc dc boost converter with time limited one shot current control and single shared Hysteresis Comparator
Symposium on VLSI Circuits, 2011Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited one-shot current control technique used to extend the outputs of a single-inductor multiple-output DC-DC converter without stability and complexity issues. The proposed scheme also reliably supports many outputs with unbalanced loads. True all-Comparator control is realized with a single shared Hysteresis Comparator and a fixed switching frequency of 800-kHz. The maximum efficiency reaches 92%. The fabricated 8-channel output chip occupies 2.4×2.1 mm2 in a 0.35-µm CMOS process.
Dongseok Kim - One of the best experts on this subject based on the ideXlab platform.
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a single inductor eight channel output dc dc converter with time limited power distribution control and single shared Hysteresis Comparator
IEEE Transactions on Circuits and Systems, 2013Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited power distribution control technique that can be used for single-inductor multiple-output (SIMO) DC-DC converter with many unbalanced loads. Furthermore, the true all-Comparator control technique that raises no stability or complexity issues is proposed. This all-Comparator technique for SIMO converters is realized only with a single shared Hysteresis Comparator at a constant switching frequency of 800 kHz. This leads to the development of a new inductor peak-current control technique that does not require compensators and a phase-locked loop. This converter is analyzed and compared with existing SIMO converters with respect to the requirements of next-generation power management ICs. The maximum efficiency of the converter reaches 92%. The fabricated chip supporting eight-channel outputs is implemented in a 0.35-μm CMOS process and occupies an area of 2.4 × 2.1 mm2.
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a single inductor 8 channel output dc dc boost converter with time limited one shot current control and single shared Hysteresis Comparator
Symposium on VLSI Circuits, 2011Co-Authors: Jungmoon Kim, Dongseok Kim, Chulwoo KimAbstract:This paper describes a time-limited one-shot current control technique used to extend the outputs of a single-inductor multiple-output DC-DC converter without stability and complexity issues. The proposed scheme also reliably supports many outputs with unbalanced loads. True all-Comparator control is realized with a single shared Hysteresis Comparator and a fixed switching frequency of 800-kHz. The maximum efficiency reaches 92%. The fabricated 8-channel output chip occupies 2.4×2.1 mm2 in a 0.35-µm CMOS process.
Guillaume Crevecoeur - One of the best experts on this subject based on the ideXlab platform.
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characterizing local anisotropy of coercive force in motor laminations with the moving magnet Hysteresis Comparator
Journal of Applied Physics, 2014Co-Authors: Ivan J Garshelis, Guillaume CrevecoeurAbstract:Non oriented silicon steels are widely used within rotating electrical machines and are assumed to have no anisotropy. There exists a need to detect the anisotropic magnetic properties and to evaluate the local changes in magnetic material properties due to manufacturing cutting processes. In this paper, the so called moving magnet hyteresis Comparator is applied to non destructively detect directional variations in coercive force in a variety of local regions of rotor and stator laminations of two materials commonly used to construct induction motors cores. Maximum to minimum coercive force ratios were assessed, varying from 1.4 to 1.7.
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nondestructive detection of inhomogeneity in the magnetic properties of materials with a moving magnet Hysteresis Comparator
IEEE Transactions on Magnetics, 2012Co-Authors: Ivan J Garshelis, Guillaume CrevecoeurAbstract:Microstructure, composition and residual stress determine the Hysteresis properties of magnetic materials. Detection of inhomogeneity in any of these factors requires the assessment of local rather than global properties. This paper shows that the recently developed moving magnet Hysteresis Comparator can provide a simple, sensitive, and nondestructive means for detecting asymmetrical distributions of property variations. The method is based on measurement of the magnetic field pattern arising from magnetization gradients created in a test sample during motion of a small permanent magnet. The difference in this pattern during motion of the magnet in forward and reverse directions informs on the sample's Hysteresis properties. Differences in this difference between normal and inverted sample orientations informs on the presence and extent of inhomogeneity. Results from experiments with sample groups having artificially created imhomogeneity in either microstructure, composition, or residual stress support the concept.
Ivan J Garshelis - One of the best experts on this subject based on the ideXlab platform.
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characterizing local anisotropy of coercive force in motor laminations with the moving magnet Hysteresis Comparator
Journal of Applied Physics, 2014Co-Authors: Ivan J Garshelis, Guillaume CrevecoeurAbstract:Non oriented silicon steels are widely used within rotating electrical machines and are assumed to have no anisotropy. There exists a need to detect the anisotropic magnetic properties and to evaluate the local changes in magnetic material properties due to manufacturing cutting processes. In this paper, the so called moving magnet hyteresis Comparator is applied to non destructively detect directional variations in coercive force in a variety of local regions of rotor and stator laminations of two materials commonly used to construct induction motors cores. Maximum to minimum coercive force ratios were assessed, varying from 1.4 to 1.7.
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nondestructive detection of inhomogeneity in the magnetic properties of materials with a moving magnet Hysteresis Comparator
IEEE Transactions on Magnetics, 2012Co-Authors: Ivan J Garshelis, Guillaume CrevecoeurAbstract:Microstructure, composition and residual stress determine the Hysteresis properties of magnetic materials. Detection of inhomogeneity in any of these factors requires the assessment of local rather than global properties. This paper shows that the recently developed moving magnet Hysteresis Comparator can provide a simple, sensitive, and nondestructive means for detecting asymmetrical distributions of property variations. The method is based on measurement of the magnetic field pattern arising from magnetization gradients created in a test sample during motion of a small permanent magnet. The difference in this pattern during motion of the magnet in forward and reverse directions informs on the sample's Hysteresis properties. Differences in this difference between normal and inverted sample orientations informs on the presence and extent of inhomogeneity. Results from experiments with sample groups having artificially created imhomogeneity in either microstructure, composition, or residual stress support the concept.