Browsing by Subject "Integrated magnetics"

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    Implementation Of Ćuk Converter With Integrated Magnetics For Residential Solar Applications
    (2020-05) Ramanath, Anushree
    Rooftop solar is becoming a popular source of energy for electricity generation. An optimal photovoltaic interface has ripple-free terminal currents and compact system design along with a high step-up ratio. The Ćuk converter is an ideal choice for such applications due to its unique quality of continuous current flow at both the terminals and the wide operating range. This reduces the noise, need for filtering, and electromagnetic interference issues. With the use of coupled inductor, the Ćuk converter can adequately operate with ripple-free input or output current. With the use of additional windings along with the coupled inductor, either in the form of inductor or isolation transformer, ripple-free currents can be obtained at both input and output terminals. However, only a minority of the users easily adapt Ćuk converter and its variants for their needs due to the complications in terms of the design method and absence of a rational design strategy for obtaining the suitable magnetics design that yields 'zero-ripple' terminal currents. This thesis presents an innovative, definitive method with an analytical basis for determining the component values that cater to a broad range of applications for a Ćuk converter with integrated magnetics and compares it with the basic and coupled inductor based Ćuk converter topologies. The descriptive analysis is carried out with the aid of the MATLAB scripts developed and the theoretical results are validated with the help of simulation models created using the PLECS software platform. Analysis-Led Design (ALD) tool has been developed for facilitating parameter estimation for critical topologies using MATLAB and Excel spreadsheets. This serves as an initial framework and can be utilized for the parameter estimation of other topologies with integrated magnetics. The design of the magnetic components and equivalent modeling is carried out using ANSYS and the designed converter has been implemented for experimental validation. Traditionally, control of the Ćuk converter has been extremely complicated due to unstable higher-order transfer function and non-minimum phase behavior. For the chosen topology with integrated magnetics, control techniques have been investigated and performance analysis is carried out on a system level.
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    Multiport DC-DC conversion incorporating integrated magnetics for renewables
    (2014-03) Biswas, Suvankar
    Multi-port converter design and analysis presents one of the most intriguing challenges in the incorporation of renewables in the power grid. Choice of topology is of paramount importance to improve the power conditioning. To this effect, the integrated Cuk topology achieves multiple objectives : low EMI, low component count, simplified MPPT tracking and power management, reduction of filter capacitor requirement, high efficiency. This is achieved by integrating all the magnetic components on a single core, and addition of soft-switching capability thereof. This thesis revisits the concept of integrated magnetics and formulates an elegant solution procedure to the problem of zero-ripple. It investigates the idea of utilizing the concept of a coupled-inductor filter on a three-port converter and removes the need for an external filter, thereby almost introducing an effective DC-DC transformer. The pre-FEM(finite element modelling) selection and design of the core and circuit aspects have been explained in this thesis. The simulation results are presented using PLECS. Additionally, some FEM results are added for the reduced three-winding structure. The validation of some design parameters are also discussed.A soft-switching scheme has also been demonstrated for a two-port converter with integrated magnetics. This has an active-clamp ZVS turn-on circuit with the addition of a ZCS turn-off. The design of the external components and simulation results for the same are presented as well.