• Journal of IKEEE
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• v.12 no.3
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• pp.176-183
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• 2008

The high efficiency power management IC(PMIC) with DTMOS(Dynamic Threshold voltage MOSFET) switching device is proposed in this paper. PMIC is controlled with PWM control method in order to have high power efficiency at high current level. DTMOS with low on-resistance is designed to decrease conduction loss. The control parts in Buck converter, that is, PWM control circuits consist of a saw-tooth generator, a band-gap reference circuit, an error amplifier and a comparator circuit as a block. The Saw-tooth generator is made to have 1.2 MHz oscillation frequency and full range of output swing from ground to supply voltage(VDD:3.3V). The comparator is designed with two stage OP amplifier. And the error amplifier has 70dB DC gain and $64^{\circ}$ phase margin. DC-DC converter, based on Voltage-mode PWM control circuits and low on-resistance switching device, achieved the high efficiency near 95% at 100mA output current. And DC-DC converter is designed with LDO in stand-by mode which fewer than 1mA for high efficiency.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1303-1305
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• 2002

In this study, We proposed high efficiency wind power generator system for induction generator used SVPWM swiching inverter. First, We suggest Equivalient Circuit for Ind Generator, it's characteristics equation, and equation of slip. In addition, we suggest Pick Traction Slip control methods. adapted variable power system. We study simulation result fo suggested system and output power by slip e and we identify SVPWM of suitable wind p system by comparison between SPWM and SVPW Consequently, we show that the control result variable wind power is suitable.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.171-171
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• 2010

An innovative design of a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), named HSTWEC, is presented in this paper. The system is designed to convert ocean wave fluctuation into electricity by using the HST circuit and an electric generator. Based on the floating-buoy concept, the wave forces the sub-buoy to move up and down. Consequently, the electric power can be obtained from the generator in both the moving directions of the sub-buoy through the HST circuit as shown in Fig. 1. In order to investigate the HSTWEC operations, a mathematical model of the system is indispensible. In addition, the method to control the HSTWEC, including: pump displacement control, tension adjustment control and ballast weight control, is also discussed in this paper. Finally, the design concept as well as simulation results indicated that this HSTWEC design is an effective solution and possible to fabricate for wave energy generation.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1001-1002
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• 2011

Recently, issues regarding environment and the diversification of dependence in oil are watched with keen interest. Wind power attracts most interest because of its high-energy efficiency with eco friendly functions. In this paper, deal with design of radial field permanent magnet synchronous generator for a urban wind power system. Analyzed the RFPM generator by electromagnetic, and designed wind power generator with this. The output characteristic of machine and all of process is analyzed by 2D FEA due to geometrical structures of RFPM machine.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.495-499
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• 2009

본 논문에서는 상호역회전 풍력발전기와 New Yaw System 실증시험에 대하여 제시한다. 상호역회전 풍력발전기는 공기의 유동을 가진 운동에너지의 공기역학적(aerodynamic) 특성을 이용하여 동일한 바람방향에 대해 상호 반대방향으로 회전하는 Front Blade와 Rear Blade를, Generator의 Rotor와 Stator에 각각 결합 형성한 것으로, Generator와 Dual Blade의 회전력이 원심력이 아닌 구심력으로 변환되어 무게중심이 균형을 이루게 한다. 이렇게 변환된 구심력은 회전구동부분의 편마모 현상, 소음발생 현상 및 불균형 톨크 발생 현상 감소효과가 공히 구현되도록 하여 풍력발전기의 구조적 안정성 및 발전효율 증대효과를 얻을 수 있도록 한 기술이다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.12
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• pp.2109-2115
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• 2007

The wind generators have been installed with high output power to increase the energy production and efficiency. Hence, Optimal design of the direct-driven PM wind generator, coupled with F.E.M(Finite Element Method) and Genetic Algorithm(GA), has been performed to maximize the Annual Energy Production(AEP) over the whole wind speed characterized by the statistical model of wind speed distribution. Particularly, the parallel computing via internet web service has been applied to loose excessive computing times for optimization. The results of the optimal design of Surface-Mounted Permanent Magnet Synchronous Generator(SPMSG) are compared with each other candidates to verify the usefulness of the maximizing AEP model.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.69-72
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• 2002

In this study, We proposed high efficiency wind power generator system for induction generator used SVPWM swiching inverter. First, We propose Equivalient Circuit for Induction Generator, it's characteristics equation, and power equation of slip. In addition, we suggest Pick Power Traction Slip control methods, adapted variable wind power system. We study simulation result for the proposed system and output power by slip effect. and we identify SVPWM of suitable wind power system by comparison between SPWM and SVPWM Consequently, we show that the system control result from variable wind power is suitable.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.317-319
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• 2002

In this study, We proposed high efficiency wind power generator system for induction generator used SVPWM swiching inverter. First, We propose Equivalient Circuit for Induction Generator, it's characteristics equation, and power equation of slip. In addition, we suggest Pick Power fraction Slip control methods, adapted variable wind power system. We study simulation result for the proposed system and output power by slip effect. and we identify SVPWM of suitable wind power system by comparison between SPWM and SVPWM. Consequently, we show that the system control result from variable wind power is suitable.

• Journal of Power Electronics
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• v.16 no.6
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• pp.2192-2201
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• 2016

Wind energy is currently the fastest-growing electricity source worldwide. The cost efficiency of wind generators must be high because these generators have to compete with other energy sources. In this paper, a system that utilizes an open-winding permanent-magnet synchronous generator is studied for wind-energy generation. The proposed system controls generated power through an auxiliary voltage source inverter. The VA rating of the auxiliary inverter is only a fraction of the system-rated power. An adjusted control system, which consists of two main parts, is implemented to control the generator power and the grid-side converter. This paper introduces a study on the effect of unbalanced voltages for the wind-generation system. The proposed system is designed and simulated using MATLAB/Simulink software. Theoretical and experimental results verify the validity of the proposed system to achieve the power management requirements for balanced and unbalanced voltage conditions of the grid.

• Journal of IKEEE
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• v.18 no.4
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• pp.586-592
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• 2014

In this paper, high efficiency power management IC(PMIC) with DT-CMOS(Dynamic threshold voltage Complementary MOSFET) switching device is presented. PMIC is controlled PWM control method in order to have high power efficiency at high current level. The DT-CMOS switch with low on-resistance is designed to decrease conduction loss. The control parts in Buck converter, that is, PWM control circuit consist of a saw-tooth generator, a band-gap reference(BGR) circuit, an error amplifier, comparator circuit, compensation circuit, and control block. The saw-tooth generator is made to have 1.2MHz oscillation frequency and full range of output swing from supply voltage(3.3V) to ground. The comparator is designed with two stage OP amplifier. And the error amplifier has 70dB DC gain and $64^{\circ}$ phase margin. DC-DC converter, based on current mode PWM control circuits and low on-resistance switching device, achieved the high efficiency nearly 96% at 100mA output current. And Buck converter is designed along LDO in standby mode which fewer than 1mA for high efficiency. Also, this paper proposes two protection circuit in order to ensure the reliability.