scholarly journals Efficiency Enhancement of Flexible Mode Bridgeless Boost Rectifier

2019 ◽  
Vol 9 (2) ◽  
pp. 1503-1508
Keyword(s):  
Power System ◽  
Input Voltage ◽  
Efficiency Enhancement ◽  
Fast Recovery ◽  
High Input ◽  
Voltage Range ◽  
Low Input ◽  
Flexible Mode ◽  
Simulation Results ◽  
Boost Rectifier

Most of the devices in power system become faulty due to the large content of harmonics present in voltage and current. It is mainly caused by the conduction losses in the system. At first, it is necessary to determine the extent of harmonic present by calculating the total harmonic distortions i.e., root over sum of the integral harmonics divide by fundamental harmonic. Later, identification of type of method for reducing harmonics is essential. In this project we are mainly focusing on two types of PFC bridge boost rectifier to improve the efficiency for low and high input voltage range. It using back to back bridgeless PFC boost rectifier for high input voltage and for low input voltage range, three level bridgeless boost rectifiers respectively. Fast recovery diode instead of normal diodes for better reliability and efficiency is utilized. The end model is obtained by combining two circuits BTBBL (Back to back bridgeless boost PFC) and TLBL (Three level bridgeless boost PFC) to get the FMBL (Flexible mode bridgeless boost PFC). Due to presence of less no of components, conduction losses are less hence less distortion is observed with improved efficiency. A simulation is carried out for all three models using MATLAB Simulink platform. In hardware, TLP250 driver for MOSFET is used and which is interfaced with PIC microcontroller. The hardware results are obtained that validates the simulation results.

Design Technique of High Power Efficiency LLC DC-DC Converters for Photovoltaic Cells

2018 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Hisatsugu Kato ◽  
Yoichi Ishizuka ◽  
Kohei Ueda ◽  
Shotaro Karasuyama ◽  
Atsushi Ogasahara
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Photovoltaic Cells ◽  
Input Voltage ◽  
Design Technique ◽  
Load Range ◽  
Voltage Range ◽  
Simulation Results ◽  
Secondary Side ◽  
High Power Efficiency

This paper proposes a design technique of high power efficiency LLC DC-DC Converters for Photovoltaic Cells. The secondary side circuit and transformer fabrication of proposed circuit are optimized for overcoming the disadvantage of limited input voltage range and, realizing high power efficiency over a wide load range of LLC DC-DC converters. The optimized technique is described with theoretically and with simulation results. Some experimental results have been obtained with the prototype circuit designed for the 80 - 400 V input voltage range. The maximum power efficiency is 98 %.

A NOVEL CRM PFC CONTROL METHOD FOR REDUCING INDUCTOR

2014 ◽  
Vol 23 (03) ◽  
pp. 1450038 ◽  
Author(s):  
LING-FENG SHI ◽  
HUI-LI GUAN ◽  
QIN-QIN LI ◽  
XIN-QUAN LAI
Keyword(s):  
Control System ◽  
Control Method ◽  
Input Voltage ◽  
The Novel ◽  
Voltage Range ◽  
Low Input ◽  
The Core ◽  
Large Size ◽  
Control Circuits ◽  
Conduction Mode

A novel control method for the critical conduction mode (CRM) power factor correction (PFC) converter is presented, which reduces the size of the boost inductor in the system with wide input-voltage range and improves the efficiency of the system with low input voltage. By introducing the following boost circuit, the output voltage in the application circuit varies with the input root mean square (RMS) voltage to reduce the demand for the large size of the inductor and the efficiency of the system keeps high under the low input voltage. A novel CRM PFC control system with smaller size inductor and higher efficiency is achieved by applied the following boost method to the core control circuits. Experiment results show that the inductance value of the boost inductor is 430 μH using the presented PFC control system and 700 μH using the traditional PFC control system when the input voltage varies from 85 V to 265 V. The novel control method decreases the inductor's value at 38.2%, and the efficiency of the system improves at 1.62% under the input voltage of 85 V.

Sub-Volt Fully Balanced Differential Difference Amplifier

2014 ◽  
Vol 24 (01) ◽  
pp. 1550005 ◽  
Author(s):  
Fabian Khateb ◽  
Montree Kumngern ◽  
Spyridon Vlassis ◽  
Costas Psychalinos ◽  
Tomasz Kulej
Keyword(s):  
Low Voltage ◽  
Input Voltage ◽  
Cmos Technology ◽  
Floating Gate ◽  
Voltage Range ◽  
State Variable ◽  
Low Voltage Operation ◽  
Differential Difference Amplifier ◽  
Simulation Results ◽  
State Variable Filter

This paper presents a new CMOS structure for a fully balanced differential difference amplifier (FB-DDA) designed to operate from a sub-volt supply. This structure employs the bulk-driven quasi-floating-gate (BD-QFG) technique to achieve the capability of an ultra-low voltage operation and an extended input voltage range. The proposed BD-QFG FB-DDA is suitable for ultra-low-voltage low-power applications. The circuit is designed with a single supply of 0.5 V and consumes only 357 nW of power. The proposed circuit was simulated in a 0.18-μm TSMC CMOS technology and the simulation results prove its functionality and attractive parameters. An application example of a state variable filter is also presented to confirm the usefulness of the proposed BD-QFG FB-DDA.

130 nm CMOS Bulk-Driven Variable Gain Amplifier for Low-Voltage Applications

2017 ◽  
Vol 26 (08) ◽  
pp. 1740003 ◽  
Author(s):  
Daniel Arbet ◽  
Viera Stopjaková ◽  
Martin Kováč ◽  
Lukáš Nagy ◽  
Matej Rakús ◽  
...  
Keyword(s):  
Low Voltage ◽  
Supply Voltage ◽  
Input Voltage ◽  
Cmos Technology ◽  
Variable Gain Amplifier ◽  
Voltage Range ◽  
Variable Gain ◽  
Wide Scale ◽  
Simulation Results ◽  
Low Supply Voltage

In this paper, a variable gain amplifier (VGA) designed in 130 nm CMOS technology is presented. The proposed amplifier is based on the bulk-driven (BD) design approach, which brings a possibility to operate with low supply voltage. Since the supply voltage of only 0.6 V is used for the amplifier to operate, there is no risk of latch-up event that usually represents the main drawback of the BD circuit systems. BD transistors are employed in the input differential stage, which makes it possible to operate in rail-to-rail input voltage range. Achieved simulation results indicate that gain of the proposed VGA can be varied in a wide scale, which together with the low supply voltage feature make the proposed amplifier useful for low-voltage and low-power applications. An additional circuit responsible for maintaining the linear-in-decibel gain dependency of the VGA is also addressed. The proposed circuit block avails arbitrary shaping of the curve characterizing the gain versus the controlling voltage dependency.

scholarly journals Analysis of loss distribution of Conventional Boost, Z-source and Y-source Converters for wide power and voltage range

2017 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Brwene Salah Gadalla ◽  
Erik Schaltz ◽  
Yam Siwakoti ◽  
Frede Blaabjerg
Keyword(s):  
Output Voltage ◽  
Input Voltage ◽  
Industrial Applications ◽  
Point Of View ◽  
Small Range ◽  
Voltage Gain ◽  
Boost Converters ◽  
Voltage Range ◽  
High Voltage Gain ◽  
Simulation Results

Boost converters are needed in many applications which require the output voltage to be higher than the input voltage. Recently, boost type converters have been applied for industrial applications, and hence it has become an interesting topic of research. Many researchers proposed different impedance source converters with their unique advantages as having a high voltage gain in a small range of duty cycle ratio. However, the thermal behaviour of the semiconductor devices and passive elements in the impedance source converter is an important issue from a reliability point of view and it has not been investigated yet. Therefore, this paper presents a comparison between the conventional boost, the Z-source, and the Y-source converters based on a thermal evaluation of the semiconductors. In addition, the three topologies are also compared with respect to their efficiency. In this study the results show that the boost converter has higher efficiency than the Zsource and Y-source converter for these specific voltage gain of 2 and 4. The operational principle, mathematical derivations, simulation results and final comparisons are presented in this paper.

scholarly journals Hybrid Resonant Converter with Three Half-Bridge Legs for Wide Voltage Operation

2019 ◽  
Vol 10 (1) ◽  
pp. 310 ◽  
Author(s):  
Bor-Ren Lin ◽  
Yong-Sheng Zhuang
Keyword(s):  
Power Conversion ◽  
Input Voltage ◽  
Resonant Circuit ◽  
Resonant Converters ◽  
Resonant Converter ◽  
High Input ◽  
Switching Operation ◽  
Voltage Range ◽  
Dc Power ◽  
Power Switches

This paper studied a hybrid resonant converter with three half bridge legs for wide input voltage operation. Compared to the conventional resonant converters with narrow voltage operation, the presented converter can achieve wider voltage operation. On the basis of the proper switching status of power switches, the developed converter can operate at half-bridge resonant circuit under high input voltage range and the other two full-bridge resonant circuits under medium and low input voltage ranges. Each resonant circuit has a 2:1 (Vin,max = 2Vin,min) input voltage operation range. Therefore, the developed converter can achieve an 8:1 (Vin,max = 8Vin,min) wide voltage operation. The main advantage of the studied converter is the single-stage direct current (DC)/DC power conversion instead of the two-stage power conversion to achieve wide voltage operation. Because the equivalent resonant tank of the adopted converter is controlled by frequency modulation, the soft switching operation on power switches or rectifier diodes can be realized to improve circuit efficiency. The performance of the proposed circuit was confirmed and verified by experiments with a laboratory circuit.

scholarly journals Hybrid DC-DC Converter with Low Switching Loss, Low Primary Current and Wide Voltage Operation

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2536
Author(s):  
Bor-Ren Lin ◽  
Yi-Kuan Lin
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Input Voltage ◽  
Resonant Circuit ◽  
Switching Loss ◽  
Voltage Range ◽  
Current Loss ◽  
Zero Voltage Switching ◽  
Energy Applications ◽  
Multi Stage

A full-bridge converter with an additional resonant circuit and variable secondary turns is presented and achieved to have soft-switching operation on active devices, wide voltage input operation and low freewheeling current loss. The resonant tank is linked to the lagging-leg of the full bridge pulse-width modulation converter to realize zero-voltage switching (ZVS) characteristic on the power switches. Therefore, the wide ZVS operation can be accomplished in the presented circuit over the whole input voltage range and output load. To overcome the wide voltage variation on renewable energy applications such as DC wind power and solar power conversion, two winding sets are used on the output-side of the proposed converter to obtain the different voltage gains. Therefore, the wide voltage input from 90 to 450 V (Vin,max = 5Vin,min) is implemented in the presented circuit. To further improve the freewheeling current loss issue in the conventional phase-shift pulse-width modulation converter, an auxiliary DC voltage generated from the resonant circuit is adopted to reduce this freewheeling current loss. Compared to the multi-stage DC converters with wide input voltage range operation, the proposed circuit has a low freewheeling current loss, low switching loss and a simple control algorithm. The studied circuit is tested and the experimental results are demonstrated to testify the performance of the resented circuit.

scholarly journals Extending the Input Voltage Range of Solar PV Inverters with Supercapacitor Energy Circulation

Electronics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 88
Author(s):  
Kosala Gunawardane ◽  
Nalin Bandara ◽  
Kasun Subasinghage ◽  
Nihal Kularatna
Keyword(s):  
Input Voltage ◽  
Limited Attention ◽  
Solar Pv ◽  
Distributed Energy ◽  
Voltage Range ◽  
Grid Systems ◽  
Dc Line ◽  
Technical Specifications ◽  
Input Range ◽  
Frequency Inverter

Cleaner and greener energy sources have proliferated on a worldwide basis, creating distributed energy systems. Given the unreliable nature of the renewable sources such as solar and wind, they are traditionally based on inverters interfaced with legacy AC grid systems. While efficiency, output waveform quality and other technical specifications of inverters keep improving gradually, only limited attention is given to widening the input range of inverters. This paper presents a new supercapacitor assisted (SCA) technique to widen the input range of an inverter without modifying the inverter itself. Developing a prototype version of a 24 V DC input capable supercapacitor-assisted wide input (SCASWI) inverter using a supercapacitor circulation front end and a commercial 12 V DC line frequency inverter is detailed in the article, explaining how the SCASWI inverter technique doubles the input voltage while maintaining the useful characteristics of the commercial inverter. The new technique has the added advantage of DC-UPS capability based on a long-life supercapacitor module.

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