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Wireless power transfer (WPT) via magnetic resonant coupling has been attracting research attention for various applications. Conventionally, load is assumed to be constant and only transfer efficiency is studied. In actual WPT applications, the load and transfer distance change frequently. Furthermore, information such as ratio of input voltage to output voltage, ratio of input current to output...
Wireless power transfer via magnetic resonant coupling has been extensively researched for various applications. Impedance matching is implemented so that the transfer system is resilient to positional changed and load changed. Recently powering multiple loads simultaneously is becoming the focus in wireless power transfer researches and designs. Apart from maintaining high efficiency, controllable...
This paper presents the novel driving technique of synchronous rectifier (SR) for the LLC converter. The unique characteristic of “Vo*D=constant” of LLC converter is utilized to predict optimal duty ratio D, where D is the conduction period of secondary diode. This technique does not need the sensing of SR current neither SR voltage. The technique is confirmed by experimentally.
This paper discusses the operating characteristics of push-pull type series resonant converter. The AC equivalent model and AC analysis of push-pull type series resonant converter are confirmed by analytically and experimentally. Moreover, the operating characteristics of push-pull type series resonant converter including SR are also investigated.
Photovoltaic systems should be managed to produce the maximum power under all operating conditions. The Manager is called Maximum Power Point Tracker MPPT. In this paper, the MPPT manager is attached into each PV cell in order to solve the problems of the PV shadow effect. The ripple correlation control algorithm has been used as the control action of the MPPT. The proposed system borderlines have...
This work reports the results obtained using the SEPIC converter as an MPPT (Maximum Power Point Tracker) interface for photovoltaic systems employing a single voltage sensor. The MPPT algorithm is based on the variation of the input static characteristic impedance of a SEPIC converter fed by a photovoltaic panel. Although the SEPIC input impedance theoretically depends on its load resistance, it...
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