Chih-Chiang Hua

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Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc sources include batteries, photovoltaic arrays and fuel cells...etc. If variations or fluctuations occur at the input voltage, the(More)
This paper presents the design and implementation of converters for grid-connected single-phase photovoltaic energy conversion system. In order to provide the functions of the energy management and the load distribution, the system is combined with the photovoltaic cells and utility network. Due to that the output voltage and current of the photovoltaic(More)
This paper proposes a regenerative braking system for electric bicycle based on DSP. The proposed method is used to adjust the switching sequence of the inverter, so that the braking energy will be returned to charge the battery. With the cooperation of regenerative braking energy recovery technologies and digital signal processor (TMS320LF2407) as the(More)
This paper presents the design and implementation of power converters for wind generator (WG) controlled by a digital signal processor. The system is composed of a wind generator, lead-acid batteries, a dc/dc boost converter and a bidirectional dc/dc converter. The wind generator is the main power source of the system, and the battery is used for energy(More)
In this paper, a reflex charger based on bidirectional converter is proposed. The Reflex charging strategy has a positive pulse interval, a negative pulse interval and a resting time in a complete charging period. In the positive pulse interval, the bidirectional converter is operated as a phase shift full bridge converter (PSFB). The zero voltage switching(More)
This paper proposes a residual capacity estimator with higher accuracy for lead-acid batteries. The calculation method is using different discharge capacity rate of a battery in different discharge current to calculate state of charge. Therefore, curve fitting state of charge estimation has the ability of revising value of state of charge with the changing(More)
A hybrid maximum power point tracking (MPPT) with adaptive step-size based on single sensor for photovoltaic systems is proposed. The MPPT method combines with the fractional open circuit voltage method (FOCV) and adaptive step-size method can achieve quick and accurate tracking. From the simulation results, the characteristics of PV voltage have trend that(More)
Proton exchange membrane fuel cell is one of the most promising fuel cell technologies for transportation and residential applications. Modeling of fuel cells is getting more and more important as powerful fuel cell stacks are getting available and have to be integrated into power systems. In this paper, we used the universal approximation theory of fuzzy(More)
This paper presents a bridgeless power factor correction rectifier with soft-switching. The proposed rectifier consists of a traditional rectifier diode bridge and a dc/dc power factor correction circuit, and an auxiliary circuit is used to achieve soft-switching. The auxiliary circuit can provide zero-voltage turn-on and zero-current turn-off for the main(More)