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Two types of gyrators that can be used for controlling the energy transfer between two sub networks are analyzed in this paper. The first one operates time-continuously and is implemented using a LM 13700 operational transconductance amplifier (OTA). Under PSpice simulation and experimentally gathered data the antireciprocity of this gyrator has been verified. The main advantage of this realization...
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...
Plug-in hybrid electric vehicles (PHEVs) are equipped with a high energy density battery pack, which should be externally charged form the grid. This requires a high power battery charger circuit which can operate at universal input voltage and be capable of maintaining the required output voltage and current with low ripple. The topology composed of PWM boost rectifier cascaded with a bidirectional...
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...
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,...
In this paper, a practical analog implementation of capacitor charge balance controller is presented, which is capable of achieving the optimal response for dc-dc Buck converters without relying on the knowledge of the nominal passive component (output inductor and capacitor) value. This ready-for-integration analog controller applies the output voltage curve analysis for deriving the formulas to...
This work analyzes the stability of a cascaded converter system comprised of two dc-dc converters operating with voltage-mode controllers. First it develops a single converter small-signal model and derives the mathematical representation of the converter from it. Next, it derives the required closed-loop transfer functions and input and output impedances from the model. Then, it develops the cascaded...
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...
An artificial intelligence controller for three phase three level soft switched, phase shifted PWM(phase shift modulation) dc to dc converter is proposed for high voltage and high power applications. In which, it is analyzed that four switches in a leg where outer switch behaves as a zero voltage switching and inner switch behaves as a zero current switching. The performance is analyzed by simulation...
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...
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...
This paper describes the state-space controller for the buck converter working in Continuous Conduction Mode (CCM). The converter operates at a switching frequency of 500 KHz. Aiming to study the control of this kind of converter, some classical control techniques and the control in the state space are discussed. As an example, we present the design procedure for a dc-dc buck converter with an analog...
The paper presents the design of a PI digital controller used to control the output voltage of a switched mode DC-DC buck converter. The digital controller is implemented with the help of an 8 bit microcontroller. To derive the control law of the PI controller, the switched mode DC-DC converter is modeled as a linear system using the state variables averaging technique. The authors also present the...
This work derives the closed-loop input and output impedances of three major types of DC-DC converters (Buck, Boost, and Buck-Boost) operating in voltage or current mode control. First, it introduces the small-signal converter model employed to derive the input and output impedances. Next, it reviews open-loop impedances for use in simplifying the expressions developed for closed-loop impedances....
This paper presents a grid-connected PV system where the PV source is replaced by a real time emulator. The PV emulator is based on a DC/DC converter controlled by the pole placement technique according to PV current-voltage characteristics. These characteristics are obtained by an analytical model whose parameters are identified on the basis of an actual PV installation. In the proposed plant the...
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...
In this paper analysis and design of deadbeat current control for the coupled inductor boost dc-dc converter is proposed. With the help of state-space technique, mathematical models are formulated, and then the discrete compensator designed using deadbeat control theory. Salient features of the coupled inductor topology are compared with the conventional boost topology. The compensator design is validated...
This paper describes the application of the Single Input Fuzzy Logic Controllers (SIFLC) to regulate the output voltage of a Boost (step-up) DC to DC power converter. The SIFLC is derived from the Signed Distance Method which reduces the multi-input Fuzzy Logic Controller (FLC) with Toeplitz rule table structure to a single input FLC. Effectively, it allows for the rule table to be approximated to...
In this paper a state model of the set made up of a Proton Exchange Membrane Fuel Cell (PEMFC) and a DC/DC converter is studied. The set is modeled as a plant controlled by the converter duty cycle. The paper has used a method based on state space for controlling the output voltage from converter terminals and set on working point. In this paper is utilized from optimal linear regulator for quadratic...
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