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A bridgeless Power Factor Correction (PFC) circuit based on Cuk converter is proposed in this paper. The operation during each sub-interval modes of the converter operated in Discontinuous Conduction Mode (DCM) is discussed. The small-signal and large signal models are presented using Current Injected Equivalent Circuit Approach (CIECA). PLECS/Simulink is used to verify the capability of the proposed...
Power electronic converters are an important feature of many systems such as renewable energy systems, dc distribution systems and shipboard systems. The operations of such systems are highly reliant on their embedded communication infrastructures. Communication delays in delivering converter measurements across a computer controlled network can affect the accuracy of these measurements as viewed...
DC/DC converters have been tremendously utilized nowadays. In some special applications such as military, aerospace, and precision instrumentation, the output voltage ripple of DC/DC converters has to be maintained in an acceptable level to achieve superior performance. For example, DC/DC converters are tied with inverter for adjustable speed motor controls or renewable energy interface with utility...
A multiple-input current-source converter for a stand-alone hybrid power system is proposed. As the power rating increases, isolated multiple-input converters may have limited efficiency caused by power losses from their coupled-inductor or transformer leakage inductance. This paper discusses a multiple-input circuit topology suitable for hybrid renewable energy applications, such as photovoltaic,...
Power amplifier supplied with constant supply voltage has very low efficiency in the transmitter. A DC-DC converter in series with a linear regulator can be used to obtain voltage modulation. Since this converter should be able to change the output voltage very fast, a multiphase buck converter with a minimum time control strategy is proposed. To modulate supply voltage of the envelope amplifier,...
Since a fuel cell system has a low voltage output, it requires a boost DC/DC converter for the most of vehicle and stationary power applications. In this paper, a robust sliding mode controller for the current fed full bridge DC/DC converter for PEM fuel cell systems is presented. The details of the sliding mode controller for the converter are derived and designed with a dynamic PEMFC model. The...
In this paper, a hybrid topology that combines clamp-mode coupled inductor and voltage multiplier cell is proposed to provide high voltage gain, reduced switching losses and higher power density. The duty ratio of the converter is also maintained at safe limits while obtaining the required voltage gain. The topology has been designed for a 220V, lkW application operating from 12V input. The reactive...
In this paper the small signal ac equivalent circuit model for Active Clamp Forward DC-DC Converter with Full Wave Rectifier is proposed using state space averaging technique. The model utilizes unbalanced secondary winding of the transformer and low output inductance value to achieve an improved bandwidth and load transient response. The effect of clamp capacitor on small signal characteristic is...
Active clamp technique has been proved to be an important topology for pulse width modulated (PWM) converters featuring zero voltage switching (ZVS). The small signal modeling and analysis of current mode controlled active clamp ZVS dc-dc converters are presented in this paper. It is identified that, damping due to lossless resistance inherent in active clamp topology is eliminated under uncompensated...
In this paper, a two-phase dc to dc converter module is first proposed by integrating a forward converter with a voltage-doubler to achieve high step-up ratio and high efficiency. Then, steady state analyses are made to show the merits of the proposed converter. For closed loop control design, the corresponding small signal model is also derived. It is seen that, for higher power applications, more...
An adaptive fuzzy sliding-mode (AFSM) control system is developed to control parallel DC-DC boost converters. The AFSM control system that combines a fuzzy adaptation technique with sliding mode control to enhance robustness and sliding performance in a class of uncertain multi-input multi-output (MIMO) nonlinear systems is proposed. Using an online adaptation scheme, a fuzzy sliding mode controller...
In recent trends of hybrid electric vehicle technology, selection and efficient utilization of electrical storage system is an important issue. In this paper power electronically controlled (DC-DC converter), Ultracapacitor-battery energy storage system is proposed which supply power to the BLDC motor to drive a vehicle. Whole system is simulated in MATLAB Simulink with input as vehicle drive cycle...
This paper emphasize on the investigation of small-signal behavior of a Coupled Inductor Bidirectional DC-DC (CI-BDC) converter being controlled by a Voltage Mode Control (VMC) technique. The small-signal model including converter parasitics is derived using the SS averaging technique. This linearised converter modeling makes the design of closed loop controller much easier. The closed loop model...
This paper presents design, modeling and simulation of a low-power digitally controlled synchronous rectifier (SR) buck converter. Due importance is given in the model to the effect of non-linear parameters in low voltage converters, such as equivalent series resistance ESL of the inductor, ESR of capacitor and RDS(on) of MOSFET switches. A digital PID controller is design adopting direct digital...
To obtain highest efficiency in electric vehicles and to increase the lifetime of the traction battery, a battery backup system is mandatory. In this paper, the investigation of a system for an electric lift truck propulsion system consisting of Electric Double Layer Capacitors and a DC/DC-converter, is presented. Primarily, the super capacitor voltage range is analyzed comparing super capacitor,...
An efficient pre-filter based on interleaved DC-DC boost switching converters to mitigate high-frequency harmonics injection to power sources is proposed. The main feature of the pre-filter is to mitigate the ripple of power converters input-current, improving the efficiency of the whole power conversion chain. The pre-filter optimal operating conditions are calculated, and the circuit is modeled...
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...
This paper presents the design criteria for the resonant tank of the LLC resonant DC-DC converter. In order to have high efficiency within wide input voltage range, high power factor for the LLC resonant tank should be ensured. The inductance ratio of the series and parallel resonant inductors is designed according to the voltage gain and input power factor of the LLC resonant tank. Finally, the prototype...
This paper proposes a new technique for connecting PV modules with the grid at high efficiency in case of partial shading. Normally many PV modules connected in series with single unit of dc-dc converter which be affected seriously to a partial shading as the controller disconnects the whole string. Here each PV module is connected with a single dc-dc with high voltage gain converter, and then converters...
This paper aim to design a intelligent technique for BDC converter. The converter contains non-linear elements making the mathematical model more complex which instigate the use of FLC. The nature of FLC has adaptive characteristics that can achieve robust response to a system with uncertainty, parameter variation, and load disturbance. In order to see the advantages of FLC, classical PI control has...
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