Antonio M. S. S. Andrade

High step-up integrated DC-DC converters: Methodology of synthesis and analysis

This paper proposes demonstrate an alternative method of DC-DC converter integration to generate high step-up DC/DC converters. The methodology is based on integration of the common circuits of the standard DC/DC converters and association of the converters output sections. It is presented that for the integration of two non-isolated converters, the output sections can only be series connected, meanwhile parallel and cascaded connection are also possible configurations for the integration of one isolated converter with a non-isolated one. Further simulation and experimental analyses are carried out for the Integrated boost-Zeta and Integrated boost-flyback converters confirming the theoretical analyses.

High Step-Up PV Module Integrated Converter for PV Energy Harvest in FREEDM Systems

This paper proposes a novel single-switch dc/dc converter for the future renewable electric energy delivery and management system to implement the distributed renewable energy resources (DRER). The DRER is responsible for the maximum power point tracking of the photovoltaic panel (PV) module and also for the control of central energy storage device. Due to the characteristics of the PV module and the dc-bus, the single power stage must provide low current ripple in the input and output terminals, must operate with output current and voltage regulation, and present a high-voltage conversion ratio. To achieve such features, this paper proposes a novel integrated Boost–Zeta converter. To avoid a complex modeling and control, we propose a disaggregation concept for this. Experimental results are presented for the purpose of operating the converter and also for the operation of the system.

Extended methodology to synthesize high step-up integrated DC-DC converters

This paper proposes an extended methodology to generate high step-up DC/DC converters. The methodology is based on integration of the common circuits of the standard non-isolated DC/DC converters and association of the converters output sections. For the integration of two non-isolated converters, the output sections are series connected, meanwhile parallel and cascaded connection are only possible for the integration of one isolated converter with a non-isolated one. Further simulation and experimental analyses are carried out for the Integrated boost-Zeta and Integrated boost-flyback converters.

PV module-integrated single-switch DC/DC converter for PV energy harvest with battery charge capability

This paper proposes a novel PV module integrated system with energy storage capability. The topology is based on the Future Renewable Electric Energy Delivery and Management (FREEDM) System, where Distributed Renewable Energy Resources (DRER) comprised by a single power stage, are responsible for the Maximum Power Point Tracking (MPPT) of each PV module and also the charging method of a centralized battery pack. Due to the characteristics of the PV module and the DC-bus, the single power stage must provide low current ripple in the input and output terminals, must operate with output current and voltage regulation and present a high voltage conversion ratio. To achieve such features, this paper proposes a novel boost-Zeta integrated converter. The analysis of the operation of this converter is carried out in details. The MPPT algorithm and the charging method are discussed in detail. The DC-DC converter is designed to ensure low ripple and limited charging current, as well as voltage regulation when the batteries are fully charged. In this version of the paper, simulation results are presented for the converters confirming the theoretical analysis. In final version of the paper, experimental results will be presented.

Photovoltaic battery charger based on the Zeta converter: Analysis, design and experimental results

In this paper, a complete analysis of the Zeta converter applied as a photovoltaic battery charger is carried out. The design methodology of the solar battery charger system, including the power circuit main devices and system controllers are presented in details. The solar battery charger includes an alternative Constant Current/Constant Voltage (CC/CV) charging method with inherent Perturb and Observe (P&O) maximum power point tracking algorithm. This way, the battery pack is properly charged as well as the maximum power is harvest from the solar module. In addition, continuous and overcurrent protection for the batteries features are implemented. Experimental results prove the reliability and the advantages of this proposal.

Design and implementation of PV power zeta converters for battery charger applications

The proposal of this paper is to present and analyze a charging station PV system of battery (PV-CS) with a wide range of output voltage buses, where is possible to make the charge of the batteries at the maximum power point tracking (MPPT), which increases the PV utilization. In this paper, a complete analysis of the Zeta converter applied as a photovoltaic battery charger is carried out. The solar battery charger includes a Constant Current/Constant Voltage charging method with inherent MPPT. The battery pack is properly charged as well as the maximum power is harvest from the solar module. Experimental results prove the feasibility of the design.

Quadratic-Boost With Stacked Zeta Converter for High Voltage Gain Applications

This paper proposes a different approach to combine stacked and cascaded configuration of dc/dc pulse-width modulation converter cells in order to access the benefits of both structures in a single-stage topology with a single active switch. In addition to presenting and discussing the concepts of cascaded, stacked, and the combination of both, this paper also proposes a new topology derived from these concepts. It provides high voltage conversion ratio with improved efficiency. As the name implies, this converter is obtained from the combination of two well-known dc/dc converter circuits, the Isolated Zeta Converter and the Quadratic-Boost Converter. Hence, it presents the combined features of both, i.e., high step-up voltage conversion, low input current ripple (Quadratic Boost features), and low output current ripple (Zeta’s feature). In order to verify the feasibility and performance of the converter presented, two 250-W prototypes circuits have been implemented.

Integrated Quadratic-Boost-Zeta converter for high voltage gain applications

This paper proposes a novel high step-up DC/DC converter named Integrated Quadratic-Boost-Zeta converter. It is based on the combination of two well-known DC/DC converter circuits, the Isolated Zeta converter and the Quadratic-Boost converter. The output voltage boosting is accomplished by summing both output voltages of the Zeta and the Quadratic-Boost. The circuit is designed in such way that each part of the converter outputs keeps the same characteristic of its former converter, guaranteeing their well-known advantages. Furthermore, the proposed topology has a single-switch, maintaining a low component count. In addition, differently of the high current ripple presented in the quadratic-boost converter, the proposed circuit, with an adequate filter design, can ensure a low output current ripple due to the Zeta output inductor. The Integrated Quadratic-Boost-Zeta Converter is analyzed, and its feasibility and reliability are confirmed by experimental results obtained from laboratory prototype rated at 250W and 100 kHz.

Very high voltage step-up Integrated Quadratic-Boost-Zeta converter

This paper proposes an analysis of a high step-up DC/DC converter named Integrated Quadratic-Boost-Zeta converter. It is based on the combination of two well-known DC/DC converter circuits, the Isolated Zeta converter and the Quadratic-Boost converter. The aim of this paper is to analyze the voltage static gain, the voltage and current stresses on the components of the converter as well as its main features. Additionally, the derivation for three different alternative topologies is presented and their principles of operation, features and limitations are discussed. Experimental results obtained from a laboratory prototype rated at 250W and 100 kHz prove the feasibility and reliability of the proposed converters.

Synthesis and Comparative Analysis of Very High Step-Up DC–DC Converters Adopting Coupled-Inductor and Voltage Multiplier Cells

A synthesis methodology for developing a set of very high step-up dc–dc converters is presented and discussed in this paper. The proposed method makes use of a boost converter as basic topology in which three step-up techniques are combined and incorporated. The studied techniques are the switched capacitors voltage multipliers (VM), the diode VMs, and the coupled-inductors. With the proposed methodology, many well-known converters are identified and two novel converters are proposed. In addition to a detailed analysis of the synthesis of each topology, a comparative analysis among of some important converters is presented. This comparison involves aspects such as voltage gain, voltage stress, component stress factor, component count, and relative cost. By means of these comparisons, the main characteristics and constraints of the analyzed converters are identified. Results from 250 W prototypes, designed according to photovoltaic ac-module specifications, are obtained experimentally to validate the theoretical analyses and point out advantages and limitations of each converter. The results demonstrate that the combination of the three studied techniques provides the best trend off on the comparative analysis carried out in this work.