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Being compared with conventional fluorescent lamps, the cold cathode fluorescent lamps (CCFL) have more compact size, longer lifetime and higher light efficiency. Therefore, they have been widely used as illuminating source and background lighting in LCD panel and notebook computers. However, there is lack of a suitable CCFL model which can be used for ballast designer to apply in their designing...
Busbar structures must first achieve the principal function of a low inductive, multiport interconnection. Therefore, large sheets, very close to each other are used. An interesting issue is to use the inherent capacitive effects of busbars for achieving an integrated EMI filter function. However, this may not cause any inductance degradation. Busbar topology including the ground potential brings...
A lumped equivalent circuit model for the radial mode piezoelectric transformer is presented, based on a one-dimensional analysis of the radial vibration mode and the constitutive piezoelectric equations. The model allows each of the components in the piezoelectric transformer equivalent circuit to be calculated from the appropriate material properties and device dimensions, thereby facilitating the...
Electronic ballast requires a high voltage igniter to start up the HID lamps. An improved parallel igniter is proposed in this paper. The basic mechanism of it has been analysed and design principle is developed. Based on this parallel igniter, the lamp series inductor can be optimized separately. This improves the performance of both the igniter and lamp inductor. The simulation and experimental...
In last years, behavioral models of power converters are becoming an interesting tool for the system level analysis of power electronics based systems, when these ones are composed of converters whose internal data are unknown. In this paper, a new "grey box" behavioral modeling and identification procedure for voltage mode controlled buck derived converters is proposed. The model is composed...
In this paper, a simple and effective method to obtain the small signal model of discharge lamps by means of step response is presented. The lamp parameters measurement is improved by means of a circuit based on passive elements. This study describes the conditions that must fulfill the parameters extraction, as well as the additional information that provides the step response test. The stability...
Suitable model for the analysis and control of the Unified Power Quality Controller (UPQC) was quite difficult to obtain, which prohibited not only the analysis and comparison between existing control strategies, but also the industrial applications, as no generalized method to design the control loop for different disturbances. In this paper, a unified DC voltage compensator design is proposed for...
The steady states and dynamics of a fuel cell system are influenced by both operating conditions and the frequency characteristics of electrochemical reactions in a cell. A dynamic model of a practical fuel cell system, based on an analytical theory and empirical data, is proposed. The model consists of three parts, such as an open circuit voltage model including fuel flow and reaction in channels,...
This paper presents a hybrid control strategy for photovoltaic (PV) simulator, which emulates the output characteristics of PV arrays under different irradiation, temperature, and loads. The mathematic modeling of the I-V curve of PV arrays is investigated in this paper, and accordingly the voltage control or current control method is worked out for different segments of PV output characteristics...
This paper describes a new approach to the analysis of switched mode power converters utilizing coupled inductors and presents a novel canonical circuit model for N-winding coupled inductors. Waveform and ripple of the winding current in a coupled inductor converter can be easily determined using the developed model similar to those obtained in an uncoupled inductor converter. Influence of coupling...
The proposed methodology encompasses four study phases that address the following key design aspects of integrated power modules (IPM) for voltage regulators: Fundamental switching understanding, determination of compact/accurate loss expressions and derivation of design rules, guidelines and figure of merits for converter optimisation. The applied methods are based on several modelling approaches...
The objective of this work is to propose a whole solution for simulating power systems based on the use of behavioral DC/DC converter models. The proposed model is a generic model whose parameters can be obtained from data sheets (especially useful to model commercial converters) or equivalent tests. The model has configurable features which can be activated or disabled in order to perform optimal...
In this paper, an active gate control method for high power IGBTs in wind power generation system is investigated. With this method, the turn off voltage of the high power IGBTs using Trench-/Field-Stop technology can be clamped at proper level. The implementation of the control strategies is also introduced, which has been used in the practical wind power generation system. It is based on the control...
Average model of three-phase PWM converters is important in both theory and practical engineering. To remedy defects possessed by the existing average models of three-phase boost rectifiers and voltage source inverters (VSI), this paper proposes and derives another new-formed models that are easy-to-use and more suitable for computer simulation. During establishing switching models, the number of...
The gyrator-capacitor model of the magnetic components has shown it's superiority in simulation for the electric and magnetic information integrity, convenience in the modeling and the mixed magnetic and electronic system simulation. This paper proposes an improved gyrator-capacitor core model, with a nonlinear resistor to simulate the hysteresis characteristic, with a nonlinear capacitor to simulate...
We have analyzed the self-heating effect in high-voltage (HV) MOSFETs, and have found that the self-heating effect first becomes larger with increasing gate-source voltage Vgs due to the current-density increase. However, it then starts to get smaller again with further increased Vgs. The reason is the spatial energy dissipation accompanied with the carrier injection into the resistive drift region...
The development of new aircrafts, such as A380 and B787, has provided new opportunities in the field of electronic devices and power electronics. One of the most interesting areas is focused on the protection devices field and the management of the loads by means of the solid state power controllers (SSPC). This fact is mainly due to the great increase of these devices in the architectures of the...
Due to the energy-saving and environmentally friendly features, dimmable magnetic ballasts will be paid more attention in the future. This make a more accurate fluorescent lamp model at different dimming levels necessary at low operating frequency. This paper presents a new method that considers the effect of tube temperature at different dimming levels in the process of the analysis of the fluorescent...
In this work a generic hybrid model for dc-dc converters is proposed. The protections and remote control functions are managed by the logic system (event driven behaviour) and the power stage and control is modelled by a Wiener-Hammerstein structure. The model is oriented to be parameterized based on the information provided by manufacturers in their datasheet and it is able to predict power consumption,...
Constant on-time current-mode control has been widely used to improve light-load efficiency, because it can reduce the switching frequency to save switching-related loss. Therefore, an accurate model for constant on-time control is indispensable to system design. However, available models for constant on-time control are unable to provide accurate physical insight and predict the system response,...
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