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임양수,백형래,Lim, Yang-Su,Baek, Hyung-Lae 전력전자학회 1996 전력전자학회지 Vol.1 No.1
The common drive method of the single phase induction motor(SPIM) is to install a start capacitor and a centrifugal switch in series with the auxiliary winding. In this paper, the phase angle voltage sequence controller is proposed to eliminate a start capacitor and a centrifugal switch of SPIM. In comparison with the capacitor start system of SPIM, the proposed control system shows that it contributes to saving the starting current about 57% and to improving of the starting efficiency of SPIM. The proposed starting characteristics of the SPIM is obtained with this strategy through simulation and experimental results.
김동휘(Dong-Hui Kim),백형래(Hyung-Lae Baek) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
Solar cell generate DC power from sunlight whose power is different at any instance according to condition of variables insolation and temperature, In order to Improve the system utility factor and efficiency of energy conversion. it is desirable to operate the PV system at maximum power point of solar cell under different condition, In this paper, Boost chopper is controlled It output voltage with a new discrete control algorithm for MPPT. PWM signal of DC-DC converter are generated with a 89C51 microcontroller. switching frequency of DC-DC converter is set at 10kHz, Simulation and experimental results show that the PV system studied m this paper is always operated at maximum power point under different maximum power point of solar cells having stabilized output voltage waveform with relatively small ripple component.