* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download analysis of the interleaved isolated boost
Power over Ethernet wikipedia , lookup
Solar micro-inverter wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Electrical ballast wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Power engineering wikipedia , lookup
Mercury-arc valve wikipedia , lookup
Three-phase electric power wikipedia , lookup
History of electric power transmission wikipedia , lookup
Electrical substation wikipedia , lookup
Current source wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Power inverter wikipedia , lookup
Stray voltage wikipedia , lookup
Surge protector wikipedia , lookup
Distribution management system wikipedia , lookup
Analog-to-digital converter wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Schmitt trigger wikipedia , lookup
Voltage optimisation wikipedia , lookup
Voltage regulator wikipedia , lookup
Television standards conversion wikipedia , lookup
Alternating current wikipedia , lookup
Mains electricity wikipedia , lookup
Current mirror wikipedia , lookup
Integrating ADC wikipedia , lookup
Opto-isolator wikipedia , lookup
HVDC converter wikipedia , lookup
ANALYSIS OF THE INTERLEAVED ISOLATED BOOST CONVERTER WITH COUPLED INDUCTORS ABSTRACT: This paper analyzes the interleaved boost with coupled inductors (IBCI) converter, which is an isolated topology that is suitable for high step-up applications. Two main contributions are given: an exhaustive steady-state analysis and an accurate small-signal model. The former allows for deriving a closed-form no iterative design procedure for the power-stage active and passive components. In addition, it reveals an interesting equivalence with an apparently different converter, i.e., the single active bridge. Subsequently, the IBCI converter dynamic behavior is investigated, deriving a nonlinear average model that, under small-signal approximation, can be linear zed around a given operating point and used for feedback controller design. A single photovoltaic module interface converter, rated for 300-W output power, is considered as a case study to validate the analysis outcome and the design procedure. Both are fully validated by measurements taken on the laboratory prototype. INTRODUCTION: A configuration with many parallel-connected boost-fly back converters sharing a single active clamp has been proposed, which requires n + 1 magnetic elements, where n is the phase number. A bidirectional boost coupled with a fly back stage has been proposed, giving rise to a non isolated structure, where soft-switching is achieved at the expense of a high circulating current. A family of isolated converters providing a continuous input current is described, where two isolated fly back converters, including cross-coupled windings and a single active clamp, are used. These topologies require two transformers with three windings each. A cascaded boost and isolated half-bridge stages sharing the same switching cell are described, in which the total power is processed twice. An interleaved boost with series-connected outputs is presented, which is able to achieve input current ripple cancelation at a predetermined dutycycle value. A double dual boost has been analyzed, with the focus on small-signal modeling and control design. An isolated converter with an interleaved current source generator employing a resonant tank for zero-current commutation is proposed. A voltage doubler rectifier is also used to increase the voltage gain. However, operation at dutycycle values below 50%, i.e., in a non overlapping mode, is not possible, unless suitable provisions are taken to limit the device overvoltage when both switches are open. EXISTING SYSTEM: Conventional step-up converters, such as the boost converter and flyback converter, cannot achieve a high step-up conversion with high efficiency because of the resistances of elements or leakage inductance; also, the voltage stresses are large. A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage. It is a class of switched-mode power supply (SMPS) containing at least two semiconductors (a diode and a transistor) and at least one energy storage element, a capacitor, inductor, or the two in combination. Filters made of capacitors (sometimes in combination with inductors) are normally added to the output of the converter to reduce output voltage ripple. PROPOSED SYSTEM: Continuous input current can also be obtained using an interleaved boost input stage, for the non isolated version, and for the isolated version herein called interleaved boost with coupled inductors (IBCI). Similar interleaved topologies are described, where the two coupled inductors are replaced by one or two inductors and a transformer. In addition, the value of the output capacitors is reduced, so as to exploit the resonance between them and the secondary side inductor L, thus changing some commutations from zero voltage to zero-current type. ADVANTAGES: continuous input current, due to ripple cancelation inherent current sharing reduced switch voltage stress zero-voltage commutations in a wide load range leakage inductance exploitation clean device voltages without ringing BLOCK DIAGRAM: TOOLS AND SOFTWARE USED: MPLAB – microcontroller programming. ORCAD – circuit layout. MATLAB/Simulink – Simulation APPLICATIONS: fuel cells (FCs) single photovoltaic (PV) modules CONCLUSION: In this paper, a detailed steady-state analysis of the IBCI has been presented. This allowed the definition of a noniterative design procedure where all circuit parameters can be sized moving from a reduced set of specifications. Incidentally, the structural equivalence of the IBCI and the SAB has been illustrated. A nonlinear average model and a linear small-signal model were also derived, which allow for accurately predicting the IBCI c onverter dynamic behavior. The model revealed how the converter response is dominated by the boost input stage and by the output filter time constant, at least up to one tenth of the switching frequency. The effect of the energy transfer inductor and of interleaving operation is therefore negligible in that range. The design procedure has been applied to design a case study, a 300-W-rated prototype, suitable as a PV module front-end converter. Nevertheless, the interleaved operation, together with the continuous input current absorption, makes this topology suitable for higher power levels as well. Examples in the kilowatt range are indeed reported in [22] and [23]. The prototype has been extensively tested, and the experiments have proven the accuracy of the steady-state analysis of the design procedure as well as of the small-signal model. The converter has shown a 95.8% peak efficiency when operating at 26-V input and delivering 300-W output power at 400 V. REFERENCES: [1] R. J.Wai and R. Y. Duan, “High step-up converter with coupled-inductor,” IEEE Trans. Power Electron., vol. 20, no. 5, pp. 1025–1035, Sep. 2005. [2] J. W. Baek, M. H. Ryoo, T. J. Kim, D. W. Yoo, and J. S. Kim, “High boost converter using voltage multiplier,” in Proc. IEEE IECON, 2005, pp. 567–572. [3] G. Spiazzi, P. Mattavelli, and A. Costabeber, “Effect of parasitic components in the integrated boost-flyback high step-up converter,” in Proc. IEEE IECON, 2009, pp. 420–425. [4] G. Spiazzi, P. Mattavelli, and A. Costabeber, “Improved integrated boost-flyback high stepup converter,” in Proc. IEEE ICIT, 2010, pp. 1169–1174. [5] M. Das and V. Agarwal, “A novel, high efficiency, high gain, front end dc–dc converter for low input voltage solar photovoltaic applications,” in Proc. IEEE IECON, 2012, pp. 5744–5749.