Design, modeling and analysis of a new dual input-output switched capacitor converter (original) (raw)

Analysis, design, and applications of switched-capacitor converters

2016

Nowadays, with the increasing demand for smaller and lighte r power converters in commercial electronics, there is an increasing popularity in b oth the research and the development of switched-capacitor (SC) converters. With the abs ence of inductors and bulky transformers, the power density of SC converters is improve d as compared to traditional switching mode power supplies. Moreover, the possibility o f fabricating an entire SC converter into an integrated circuit (IC) chip has resulted in many companies producing SC converter ICs and many portable electronic products adop ting such ICs. The purpose of the thesis is to summarize the previous resear ch works and report the accomplished works. A literature review is included to summ arize the research efforts of SC converters. Converter topologies, modeling works, co ntrol methodologies, practical applications, and the industrial market development of SC converters are discussed. Limitations of previous works are highlighted and ...

Design, modeling and analysis of multiple input buck boost switched capacitor based converter

2018

DC DC converter forms the heart of any electrical or electronic circuit for lowering, raising, inverting or conditioning the output voltage from the available input voltage. Switched Mode Power Supplies(SMPS) are the widely used converters in this segment. In any modern SMPS an energy storage element is included to transfer the energy from source to load. Inductors are the widely accepted storage element in most of the present day SMPS. Inductors are capable of carrying larger currents by virtue of its construction in large power converters. However, when it comes to small converters inductors which are bulky and heavy often restrict the application in an on chip miniaturization circuit. Capacitor, which is another energy storage element, because of its high energy density and low equivalent series resistance compared to inductors, is promising for efficient on chip application. Switched capacitor converters (SCC) that are using only switches and capacitors popularly known as flying...

Analysis and design of switched capacitor converters

2005

Abstract Switched capacitor converters have become more common in recent years. Crucial to understanding the maximum power throughput and efficiency is a model of the converter's equivalent resistance. A new form for equivalent resistance is derived and discussed in a design context. Quasi-resonant operation is also explored and compared to non-resonant operation. Several capacitor technologies are evaluated and compared

Performance Comparison of Multi Input Capacitor Converter Circuits

International Journal of Electrical and Computer Engineering (IJECE), 2018

This paper analyze the operation of a multi input switched capacitor (MIC) converters using a couple of switches, diodes and capacitors for several levels. With two input sources it is possible to obtain 8 output voltage levels. Here, 5 topologies of switched capacitor circuits namely summation, subtraction, inverting, double and half circuits are simulated and their performances are analyzed. Multi Input Converters have a high regard for multiple renewable energy sources used in smart grid systems, especially for distributed generators. The effects on output voltage with variation in load for different frequencies are also analyzed. Hardware implementation of summation and subtraction circuit is carried out and the results are compared with the simulated results 1. INTRODUCTION Inductors and capacitors are the main energy storage for the switched-mode power supplies (SMPS). The sizes are usually dominated by the inductor and transformer [1]. DC-DC converters play a vital role in renewable energy based applications [2], [3]. Resonant converters based on this SMPS can operate at high switching frequencies to decrease the size of the converters, however, their switching frequencies are not constant and hence the electromagnetic interference (EMI) filter cannot be optimized. Extended period quasiresonant converters have been introduced in [4], [5]. These converters are able to operate at constant switching frequencies and all the switching devices are switched at zero-current or zero-voltage. The requirement of magnetic components restricts the application and increases the difficulty in designing the converters. These difficulties were replaced with switched capacitor circuits. Switched-capacitor (SC) DC-DC power converters [6] are a subset of DC-DC power converters, using only switches and capacitors that can efficiently convert one voltage to another. Since SC converters does not have any inductors, they are ideal for integrated implementations, as common integrated inductors are not suitable for power electronic applications. The main advantage of this kind of converter is that no magnetic component is required for storing energy, making it possible to fabricate a smaller size and lighter weight converter in an integrated circuit [7]. There are very mature theories and techniques to design variety of DC-DC converters with single-input. Buck converter can for lower voltage than input [8], boost converter output higher voltage [9], boost-buck converter and Cuk converter can obtain the output voltage with step up or down ratio [10] In addition, Half-mode, Double-mode [11], step-up and step-down converter based on switched-capacitor can output half, twice and multiple and fractional voltage ratios [12], [13]. In recent years, with the continuous development