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A new dimmer for alternating-current directly driven light-emitting-diode lamp 被引量:1
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作者 kim jong-hyun RYU Myung-hyo +1 位作者 YOON Hyok-min SONG Eui-ho 《Journal of Central South University》 SCIE EI CAS 2012年第2期374-379,共6页
A new dimmer using a mental-oxide-semiconductor field-effect transistor (MOSFET) for alternating-current (AC) directly driven light-emitting-diode (LED) lamp was presented. The control method of proposed dimmer is pul... A new dimmer using a mental-oxide-semiconductor field-effect transistor (MOSFET) for alternating-current (AC) directly driven light-emitting-diode (LED) lamp was presented. The control method of proposed dimmer is pulse width control (PWM) method. Compared with the conventional phase-controlled dimmer, the proposed PWM dimmer can produce sine wave and did not cause harmonics problem. Furthermore, the proposed control method did not amplify the light flicker due to the independence of input voltage. Therefore, the PWM dimmer can be used as the dimmer of the AC LED lamp instead of the conventional phase-controlled dimmer. The experimental result shows that the proposed PWM dimmer has good performances. 展开更多
关键词 alternating-current directly driven light-emitting-diode pulse width control total harmonic distortion flicker triac
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Design of a novel 50kW fast charger for electric vehicles 被引量:1
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作者 YOON Hyok-min kim jong-hyun SONG Eui-ho 《Journal of Central South University》 SCIE EI CAS 2013年第2期372-377,共6页
A novel 50 kW fast charger was proposed for electric vehicles. The proposed fast charger is divided into two main sections an AC-DC converter performing a PFC function and a DC-DC converter performing a charging funct... A novel 50 kW fast charger was proposed for electric vehicles. The proposed fast charger is divided into two main sections an AC-DC converter performing a PFC function and a DC-DC converter performing a charging function. A transformer including leakage inductances was used in the AC-DC converter in order to obtain isolation and inductance. A series-connection topology was used in the DC-DC converter between the DC-bus and outlet. This topology enables high power conversion efficiency up to 95% for the DC-DC converter. In order to reduce the impact of the 50 kW charging on the AC grid, the proposed fast charger system includes a buffering battery unit between the two main power conversion units. This leads to reductions in the power installation costs of power companies and to improvements in the power quality were verified through simulations and experimental results. on the AC grid. The performances of the proposed fast charger system 展开更多
关键词 fast electric vehicle charger CHARGING INFRASTRUCTURE buffering battery
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