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The occurrence of leakage current that can occur in photovoltaic (PV) system depends strongly on the value of parasitic capacitance between PV panel and the ground. However, traditional method to acquire that value is by experience estimation. This paper presents a novel 2-D parasitic edge capacitance model and a straightforward approach to accurately calculate the involved panel parasitic capacitance...
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...
This paper presents a two-stage PFC LED driver. The two outstanding features of the proposed driver are: 1 the entire system has no electrolytic capacitor, which prolongs the lifetime of the LED driver; 2 LED string current is controlled directly and PWM diming also provided. This makes the driver is virtually a current source driver. The front end stage is the conventional Boost AC/DC converter which...
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...
A charge pump power factor correction (CPPFC) circuit for PT power converter has been proposed according to the circuit topology and the features of PT. The main contributions are as follows: 1) The principle of continuous input current CPPFC circuit and the unity power factor condition have been analyzed; 2) The design method has been put forward and the parameters have been calculated; 3) The Pspice...
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...
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