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In an induction heating system the energy delivered into the work piece for heating purposes with respect to the self-heating of the windings is quantified by means of the induction efficiency. This parameter can be measured by using an energy balance, for example the ratio between the boiled water weight and the electrical energy supplied into the windings considering a period of time. In this paper...
A hybrid modeling technique in CCM (Continuous Conduction Mode) and equally valid in DCM (Discontinuous Conduction Mode) is proposed for the step-down Buck converter. An improved ν-resolution model is obtained which easily allows the deduction of the equivalent PWA (Piecewise Affine) model that is adequate for predictive control design. Simulation results of the open-loop model are presented, proving...
Modular Multilevel Converters (MMCs) are a new circuit topology to realize multilevel converters. Major advantages of MMCs in comparison to other multilevel converters or standard Voltage Source Converters (VSCs) are lower costs and a modular design for high voltage applications, higher reliability and longer maintenance intervals. However, modular multilevel topologies generally require advanced...
In this paper, the application of the Sliding Mode Theory, in terms of observer and control design, to the DC-DC Single-Ended Primary Inductor Converter (SEPIC) is investigated. The choice and influence of the sliding surface regarding the state vector is presented. Usual sliding surfaces chosen to control other high order DC-DC converters are found not to work on the SEPIC. Thus, other surfaces are...
Universal inverters will be the future interface of distributed generation to power systems based on active distribution grid where island operation should be allowed. Universal inverters should be able to work both connected to the grid both in island mode. A self-commissioning process based on advanced optimization algorithms should tune the parameters of the controllers to manage the different...
Harmonic currents generated from the power electric equipment such as IH cooking heaters involve harmful influences to the other equipments connected to the utility grid. As for the IH cooking appliances, adding the PFC converter to the input stage of IH cooking heater is one of the practical solutions to suppress harmonic current influences. In this paper, two operation modes; DCM and CCM for the...
This paper studies three fundamental switching patterns for resonant converters to achieve Zero Voltage Switching (ZVS) operation. To evaluate the performance of the three control methods, three resonant topologies are taken into consideration: series resonant, parallel resonant and series-parallel resonant. The criteria functions for ZVS operation are derived for each control method and topology...
This paper proposes a Class D current-source resonant boost converter, which is controlled with the 1-bit delta-sigma modulator. The 1-bit delta-sigma modulator, which is an analog to digital (A/D) converter for digital audio amplifiers, generates a 1-bit (1/0) signal based on the input signal. This `periodical' output signal has an advantage in driving resonant converters. Class D voltage-source...
A new bridgeless power factor correction circuit (PFC) based on single ended primary inductance converter (SEPIC) is proposed. The number of component conducted at each subinterval mode is reduced compared to the existing topologies. Analysis of the converter operated in discontinuous-conduction mode (DCM) is discussed. Experimental circuit for the proposed converter is developed with universal input...
As the number of transistors in microprocessors increases, their power demand increases accordingly. This poses design challenges for their power supply module called VRM (Voltage Regulator Module) especially when operated at sub voltage range. This paper presents the design of a new multiphase multi-interleaving topology that addresses these challenges. A lab scaled hardware prototype of the new...
This paper presents a positive reference pulse width modulation (PWM) technique based on multi-switching dc voltage source converter. This technique aims to reduce the switching losses and the number of devices. Five modules of dc voltage source are used to generate 11 levels of dc multi-step signals, and a single H-bridge is used to generate a new unipolar PWM technique. The modulation unit consists...
In this paper a novel soft switching three-phase pulse width modulation (PWM) rectifier is proposed. Various switching state sequences of a three-phase three-switch buck-type unity power factor rectifier are reviewed and the operation modes of the converter are explained and analyzed. The converter operates under zero current switching (ZCS) condition. By using an auxiliary circuit with a simple method...
The paper presents a new wide output range reconfigurable structure (WOR-RS) dc-dc converter, which is an extension of the full bridge isolated dc-dc converter with two output channels by adding an active switch and two diodes. The proposed WOR-RS is able to smoothly reconfigure the two output channels in parallel or series to realize wide output range. With this approach, the output voltage is shared...
This paper describes the principles and characteristics of a novel ac-link bidirectional DC-DC converter with synchronous rectifier, which has a mechanism formed from two bridge-type DC converters that are linked through superposition in additive polarity in series. For an isolated dual active bridge DC-DC converter, which has been studied for many years, the rated voltage of its switching elements...
A new adaptive auxiliary circuit scheme is proposed for the phase-shift full-bridge converter that provides zero-voltage-switching (ZVS) for all switches for a wide variation in load and input range. Complementary voltage seconds works on the auxiliary inductor to provide adaptive energy for the lagging leg switches. Therefore, ZVS operation over a wide load conversion range is achieved without significantly...
This paper studies stability and bifurcation of a simple piecewise linear dynamical system relating to several kinds of switching converters with solar cell input. Applying a simplification method, we derive the 1D phase map that is useful for precise analysis. The system can exhibit rich bifurcation phenomena, and for simplicity, we consider bifurcation for two parameters corresponding to temperature...
This paper illustrates how Kalman filters were used in a model-based fault diagnosis of a DC-DC boost converter. A time-averaging model was used with the Kalman filters to generate residual signals. Multiple signature faults were developed in fault scenarios to identify critical variations in the elements of a power converter using the adaptive estimation technique. Results show a very precise and...
This paper presents the analysis and the implementation of a digital voltage power based controller with adaptive loss estimation algorithm. An improved controller of DC/DC boost converter relies on the estimation of all types of the losses which occur in the converter was proposed. The controller use estimating method to estimate the power losses of the converter and converts the losses into two...
This paper shows how a single phase STATCOM model can be seen as a two block series connection. In this way, it is suitable to use a cascade control in order to regulate both DC links voltages and reactive power needed by AC main. This last is achieved through control strategy consisting in two parts: one of them is a cascade multi-loop control which delivers only one average control signal and the...
In order to compensate the worldwide energy consumption that is still rising, the wind energy is becoming more and more important. For this reason, the analysis of wind energy conversion systems, in which the occurrence of faults has a high negative impact, becomes a very important issue. Considering this, the aim of this paper is to present some diagnostic methods for open-circuit faults in the two...
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