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A novel voltage equalizer called Multilevel Architecture is proposed for series-connected photovoltaic (PV) system to prevent negative influence of mismatch issues. This undesirable mismatch triggers multiple power maxima in PV string P-V characteristics, encumbering maximum power points tracking (MPPT) algorithms. This paper designed a control scheme for isolated-port flyback converter operating...
A LC filter can be added to the input of the conventional buck converter to make the converter operate in discontinuous capacitor voltage mode. In this mode, the converter obtains the inherent power factor correction. Besides, both the input and output current will be continuous. This makes it possible for the converter operating at a high power level range. The input current will follow the input...
A novel electrostatically suspended gyroscope based on MEMS technology is presented in this article, including its structure and basic principle of electrostatic suspension. Especially integrated control strategy and position feedback PID control method of the Z-axis suspension system are analyzed. From the simulation result based on Lab VIEW model we can see that the gyroscope rotor can be suspended...
In this paper, a novel discrete model has been proposed to simulate the controller IC UC3854. The main contributions are as followings: 1) The power stage of the Boost converter has been modeled by using the large signal approach and the loop gain of current program has been put forward; 2) The continues-time voltage control diagram has been investigated by employing equivalent power stage which contains...
A single stage AC/DC converter with resonant model PFC has been deeply studied in this paper by mathematic analysis. The following results have been revealed: (1).The working conditions for the circuit have been derived and can be expressed by the formulas, which can be used to select the parameters of the circuit; (2). It has been proved that the bus voltage decreases if output power increases and...
A single stage AC/DC converter with resonant model PFC has been deeply studied in this paper by mathematic analysis. The following results have been revealed: (1).The working conditions for the circuit have been derived and can be expressed by the formulas, which can be used to select the parameters of the circuit; (2). It has been proved that the bus voltage decreases if output power increases and...
Based on the electric characteristics of HID (high-intensity-discharge) lamps, novel control strategy and implement method for electronic ballasts of HID lamps have been investigated in this paper. The main contributions are as the followings: (1) to ensure to ignite the HID lamps safely, the auto-tracking technique, which can offer proper igniting voltage, has been put forward, (2) to make sure to...
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