• JSTS:Journal of Semiconductor Technology and Science
• /
• v.14 no.3
• /
• pp.284-299
• /
• 2014

Coarse-grained reconfigurable architecture (CGRA)-based multi-core architecture aims at achieving high performance by kernel level parallelism (KLP). However, the existing CGRA-based multi-core architectures suffer from much energy and performance bottleneck when trying to exploit the KLP because of poor resource utilization caused by insufficient flexibility. In this work, we propose a new ring-based sharing fabric (RSF) to boost their flexibility level for the efficient resource utilization focusing on the kernel-stream type of the KLP. In addition, based on the RSF, we introduce a novel inter-CGRA reconfiguration technique for the efficient pipelining of kernel-stream on CGRA-based multi-core architectures. Experimental results show that the proposed approaches improve performance by up to 50.62 times and reduce energy by up to 50.16% when compared with the conventional CGRA-based multi-core architectures.

• Proceedings of the IEEK Conference
• /
• 2002.06e
• /
• pp.207-210
• /
• 2002

This paper describes a design of multiple-mode single-output DC/DC converter which can be used in both up and down conversion. Proposed up/down converter does not produce a negative voltage which is generated in conventional buck-boost type converter. Three types of operation mode(up/down/bypass) are controlled by the input voltage sense and command signals of target output voltage. PFM(pulse frequency modulation) control is adopted and modified for fast tracking and for precise output voltage level with an aid of output voltage sense. Designed DC/DC converter has the performance of less than 5 % ripple and higher than 80 % efficiency. Chip area is 3.50 mm ${\times}$ 2.05 mm with standard 0.35 $\mu\textrm{m}$ CMOS technology.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.928-929
• /
• 2008

A dc/dc power conversion system using multi stage capacitor is proposed in this paper. The proposed new type converter is designed from high efficiency dc/dc converter with fixed boost ratio and variable voltage converter. The tests have been done using PSIM computer simulation to confirm the analysis and control concept.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.790-796
• /
• 1998

A novel mode of parallel operation of a modular 3-phase AC-DC flyback converter for power factor correction along with tight regulation was recently analyzed and presented. The advantage of the proposed converter does not require expensive high voltage and high current devices that are normally needed in popular boost type 3-phase converter. In this paper the detailed small signal analysis of the modular 3-phase AC-DC flyback converter is provided for control purposes and also experimental results are included to confirm the validity of the analysis.

• Proceedings of the KIPE Conference
• /
• 1998.10a
• /
• pp.978-981
• /
• 1998

This paper presents a newly developed transformer-less single phase inverter for a photovoltaic (PV) power system. In the proposed system, there is no earth-leakage current at all in the theoretical base, and the main circuit of this system is rather simple and it is expected the higher efficiency will be realized. The system is operated by a digital signal processor (DSP) which makes it more flexible in the control. From the experimental results, it is found that this new inverter supplies the AC power to utility grid line with the power factor of nearly unity.

• Journal of Power Electronics
• /
• v.2 no.3
• /
• pp.212-219
• /
• 2002

A novel mode of parallel operation of a modular 3-phase AC-DC flyback converter for power factor correction along with tight regulation was recently analyzed and presented. The advantage of the proposed converter does not require expensive high voltage and high current devices that are normally needed in popular boost type 3-phase converter. In this paper tile detailed small signal analysis of the modular 3-phase AC-DC flyback converter is provided for control purpose and also experimental results are included to confirm the validity of the analysis.

• Proceedings of the KIPE Conference
• /
• 2002.07a
• /
• pp.551-554
• /
• 2002

This paper describes a new interactive inverter between a photovoltaic(PV) array and single-phase utility that avoid the bulky input (60Hz) transformer on the AC side. The interface employs a pwm boost converter on the DC side followed by a pwm current-forced single-phase rectifier for injecting the power from the PV array into the mains. The current waveform at the AC side remains sinusoidal and exactly in phase at all time. The circuit also has the advantage of requiring fewer switching device than high-frequency link system. This paper describes modeling of PV array and new system topology. Simulation results on the performance of the connection are also presented.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.62-64
• /
• 2006

본 논문에서는 하나의 인덕터만을 사용하여 동작하는 벅부스트 방식의 새로운 배터리 이퀄라이저를 제안하고, 그 동작을 살펴본다. 제안된 배터리 이퀄라이저는 배터리 전압을 센싱할 필요 없이, 벅부스트의 DCM(전류 불연속) 모드를 이용하여 배터리 간의 에너지를 순차적으로 순환시키고 이 과정을 반복하여 배터리 간의 전압을 균등화한다. 즉, 제안된 회로는 전압 센싱을 필요로 하지 않으므로 제어 회로를 단순화 시킬 수 있고, 인덕터를 하나만 사용함으로써 회로 자체의 크기와 가격을 줄일 수 있는 장점을 가진다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.14 no.4
• /
• pp.16-22
• /
• 2000

This paper describes Transformer-less type utility interactive system that is combined with buck/boost chopper applying partial resonant method, which remove Transformer, and high efficient PWM inverter. Therefore, it is possible to make it lightweight, to cut down the cost, and to improve its reliability. What the merits of this system are that we can transmit arbitrary power arbitrary power to load and utility regardless of generating voltage magnitude of solar cell and we can always obtain high factor controlling by equal phase signal with utility.

• The Transactions of the Korean Institute of Electrical Engineers P
• /
• v.59 no.3
• /
• pp.288-292
• /
• 2010

Recently, in energy storage system, the EDLC is paid attention as a new environmentally friendly energy storage element. This capacitor has higher energy density than the electrolytic capacitor. Also, this capacitor has a lot of advantage such as no maintenance, longer life cycle and faster charge-discharge time than the battery system. But the EDLC must have a each charge-discharge controller to effectively control, an energy design method circuit to use effectively energy, and several compensation techniques to control a optimal operating. In this respect, this study suggests major parameters to effectively represent the characteristics of EDLC, the measurement methods of those parameters have been investigated with experiments, and the interpretation about the buck/boost DC/DC converter for the operation of EDLC.