TRANSFORMERLESS DC–DC CONVERTERS WITH A VERY HIGH DC LINE-TO-LOAD VOLTAGE RATIO

2004 ◽  
Vol 13 (03) ◽  
pp. 467-475 ◽  
Author(s):  
B. AXELROD ◽  
Y. BERKOVICH ◽  
A. IOINOVICI
Keyword(s):  
Boost Converter ◽  
Switched Capacitor ◽  
The Novel ◽  
Boost Converters ◽  
Voltage Ratio ◽  
High Voltage Gain ◽  
Dc Gain ◽  
Dc Line ◽  
Output Capacitor ◽  
Output Filter

By splitting the output capacitor of a basic boost converter, and combining the resulting capacitors with the main switch in the form of a switched-capacitor circuit, a new step-up structure is realized. Without using a transformer, a high line-to-load DC voltage ratio is obtained. An output filter is added, as usual, in boost converters for getting a free-ripple output. The circuit compares favorably with a quadratic boost converter regarding the count of devices and efficiency, even if it presents a lower DC gain. A DC analysis of the novel converter is presented. Experimental and simulation results confirm the theoretical expectations. By increasing the number of capacitors in the switched-capacitor circuit, higher gains can be obtained. Versatility, high voltage gain and good transient response are the features of the proposed converter.

scholarly journals Performance Assessment of a High-Powered Boost Converter for Photovoltaic Residential Implementations

2019 ◽  
Vol 25 (6) ◽  
pp. 40-47 ◽  
Author(s):  
Davood Ghaderi ◽  
Gokay Bayrak
Keyword(s):  
Simple Structure ◽  
Boost Converter ◽  
Boost Converters ◽  
Pv Systems ◽  
Pv Panel ◽  
Power Switch ◽  
Duty Cycles ◽  
Dc Gain ◽  
Transformer Design ◽  
Simulation Results

This paper introduces a new boost converter operating in several duty cycles with a high powered and no transformer design for Photovoltaic residential implementations. The proposed converter is performed without any extra power switch by a voltage pre-amplifier unit between the input inductor and the power switch and is derived with a simple structure. The designed converter provides a voltage gain by 38 times for the operation of 90% of the duty cycle. This condition shows that the proposed converter has more efficient compared to the conventional boost converters. Besides, a higher amount of DC gain is possible by adding a cascade blocks connection of switched-capacitor (SC) in the converter’s output. The operational principles are evaluated to justify the utility of converter for residential PV systems in the study. Also, a 200 W powered prototype converter is implemented by applying a commercial PV panel in the laboratory. The experimental results confirm both the mathematical and simulation results.

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