Keun-Wan Koo

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This paper compares various topologies for 6.6kW on-board charger (OBC) to find out suitable topology. In general, OBC consists of 2-stage; power factor correction (PFC) stage and DC-DC converter stage. Conventional boost PFC, interleaved boost PFC, and semi bridgeless PFC are considered as PFC circuit, and full-bridge converter, phase shift full-bridge(More)
This paper analyzes AC and DC supplied home appliances comparatively for check of existing safety standards as DC power supply system serviced at home. Firstly, DC appliance model that is devised to suit dc distribution system by this paper is compared with AC appliance for analysis of the difference. Secondly, international safety standards of AC(More)
In this paper, the improved operation algorithm for parallel 3-phase PWM converter for renewable energy systems is proposed. The proposed algorithm has a higher performance at the light load condition to use 2-phase operation mode on same load conditions with parallel 3-phase PWM converter. To verify the performance of algorithm, theoretical analysis of(More)
In this paper, a hybrid mode control (HMC) is proposed to increase performance of light load operation without an extra hardware for a three phase PWM converter (TPPC). The proposed algorithm changes an operation mode of the TPPC to 3-phase or 2-phase according to the load condition. To select optimal mode change point, performance of TPPC is analyzed. The(More)
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