Search results for: Sewan Heo
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This paper proposes energy management in smart home with solar renewable energy using smart plug and inverter. Through the smart plug, information on all loads in the home is monitored and collected to an energy management center. Load profiles are managed, and the loads are classified dynamically based on the profiles in the center. When a power failure occurs, the multimode solar inverter supplies...
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This paper proposes a three-phase microgrid which consists of two renewable energy sources, an energy storage, and a power conditioning system (PCS). The renewable energy generated from the photovoltaic arrays is provided to a load and the storage through an inverter and a charger, respectively. The PCS coordinates the energy flow from the sources such as a utility grid and the renewable energy sources...
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This paper proposes single-phase power conditioning system which is capable of connecting a microgrid to an utility grid seamlessly through slew-rate control. The power conditioning system is composed of a single-phase phase-locked loop using an inverse Park transformation to detect the grid phase, a phase synchronizer using the slew-rate control, and isolated bidirectional inverter which transfers...
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This paper proposes a closed transition transfer switch (CTTS) based on a photovoltaic inverter which is capable of transition between grid-connected and island modes. The proposed system consists of the CTTS, utility grid and photovoltaic inverter connected to each input, respectively, an active load with power factor correction, and a system controller. According to the grid condition, the system...
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This paper proposes a single-phase microgrid based on a power conditioning system with dual photovoltaic array and an energy storage. A grid-connected inverter and battery charger are adopted for energy conversion from the two arrays of different construction. The power conditioning system based on a bidirectional inverter delivers power among grid, load, and storage using the grid-connected mode...
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This work proposes high performance of permanent-magnet synchronous motor (PMSM) driver IC integrated with position sensorless scheme and current sensing circuits. The position sensorless scheme is adapted with digital sliding mode observer (SMO) method that has high robust characteristics of motor parameter variations. For current sensing circuits, 10-bit successive approximation (SAR) analog-to-digital...
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Analog Integrated Circuits and Signal Processing > 2014 > 81 > 1 > 299-311
This paper describes the design of an energy and power manager for energy-harvesting devices consisting of four power converters operating in PFM mode for a low-energy and load current. The harvested energy can be maximized using a maximum power point tracking technique by a battery-charging converter, and stable voltages are generated and supplied to the charger and output loads by the other converters...
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This paper describes an efficient technique for maximum power point tracking of an energy harvesting device. The proposed technique is controlling the operating voltage of maximum power by transferring energy from the harvesting device. With the technique, an energy-aware architecture of the energy management IC maintains the maximum point with low power consumption that is appropriate for low energy...
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IEEE Transactions on Very Large Scale Integration (VLSI) Systems > 2007 > 15 > 7 > 758 - 766
Power gating has been widely used to reduce subthreshold leakage. However, the efficiency of power gating degrades very fast with technology scaling, which we demonstrate by experiment. This is due to the gate leakage of circuits specific to power gating, such as storage elements and output interface circuits with a data-retention capability. A new scheme called supply switching with ground collapse...
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Power gating has been widely used to reduce subthreshold leakage. However, its efficiency degrades very fast with technology scaling due to the gate leakage of circuits specific to power gating, such as storage elements and output interface circuits with a data-retention capability. A new scheme called supply switching with ground collapse is proposed to control both gate and subthreshold leakage...
