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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...
In this paper, the dynamics of the half-bridge LLC resonant converter are investigated based on the small signal model and a piecewise PI regulation is studied and derived by simulation. Small-signal dynamics of the circuit under consideration contain many factors that may affect regulation accuracy and performance of digitally controlled regulators. The load factor is specifically addressed here...
Aiming the great phase lag of the control-to-output small signal transfer function of LCC resonant converter, compensation networks composed of a band-stop filter and a single-pole-single-zero network are designed. Matlab and PSpice simulations are finished simultaneously, which verify that the output voltage can be regulated automatically in the disturbance of load changing. And good steady-state...
This paper presents modeling and system-level simulation of a micromachined electrostatically suspended gyroscope (MESG). The MESG reported here employs a spinning wheel-like rotor, which is suspended by electrostatic force without any mechanical support. With the precession of the rotor sensed capacitively, stator electrodes rebalance the rotor to its null position by an electrostatic feedback control...
Based on the special application of electronic ballast in movie and television industry, a novel electronic igniter for HID lamps has been investigated in this paper. Compared with the traditional magnetic igniter, the circuit has many good performances such as substantially less volume and weight. The main contributions are as the followings: (1) A model of the igniter has been put forward to analyze...
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...
In order to research the characteristic of HID with Medium-High Frequency, it is necessary to make a model for HID to describe the behaviors. Our works focus on the followings: 1) a few of external electrical properties of HID lamps have been measured to represent the V-I characteristic and output power vs. equivalent resistance as well as external voltage vs. equivalent resistance; 2) based on the...
A novel design method - narrow control bandwidth for the PT power converter has been proposed according to the electrical characteristics and the operation features of PT. The method has been proved through the input matching network of PT. The main contributions are as follows: 1) The functions of the input matching network has been analyzed; the design method has been put forward and the parameters...
In this paper, an approach by using the Agilent 4395A to measure the loop gain of the power supply has been deeply developed. The main issues have been investigated as the following: (1). Measurement techniques about the parasitic parameters of the filtering components will be studied. One is how to test of the electrolyte capacitor by Agilent 4395A; another is how to test dynamic inductance of filter...
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