Closed Loop Analysis of Bridgeless SEPIC Converter for Drive Application

2015 ◽  
Vol 6 (2) ◽  
pp. 253 ◽  
Author(s):  
Gopinath Mani ◽  
G. Gopu
Keyword(s):  
Thermal Management ◽  
Frequency Analysis ◽  
Power Factor ◽  
Single Phase ◽  
Closed Loop ◽  
Power Factor Correction ◽  
Switching Cycle ◽  
Loop Analysis ◽  
Analysis And Design ◽  
Semiconductor Switches

In this paper closed loop analysis of Single phase AC-DC Bridgeless Single Ended Primary Inductance Converter (SEPIC) for Power Factor Correction (PFC) rectifier is analyzed. In this topology the absence of an input diode bridge and the due to presence of two semiconductor switches in the current flowing path during each switching cycle which will results in lesser conduction losses and improved thermal management compared to the conventional converters. In this paper the operational principles, Frequency analysis, and design equations of the proposed converter are described in detail. Performance of the proposed SEPIC PFC rectifier are carried out using Matlab Simulink software and results are presented.

Analysis of a Novel Single Phase AC-DC CUK Converter with Low Input Current, THD to Improve the Overall Power Quality Using PFC

2018 ◽  
Author(s):  
Shadman Sakib ◽  
Ahmed Jawad Kabir ◽  
Shajal Khansur ◽  
Jewel Rana
Keyword(s):  
Power Factor ◽  
Single Phase ◽  
Closed Loop ◽  
Power Factor Correction ◽  
Performance Comparison ◽  
Open Loop ◽  
Input Current ◽  
Low Input ◽  
Analysis And Design ◽  
Cuk Converter

In this paper, analysis and design of a novel single phase AC-DC CUK converter circuit has been proposed where Power Factor Correction (PFC) controller scheme has been used in order to obtain better performance than conventional converters. Closed loop technique is applied to the bridgeless converter in order to achieve low input current, Total Harmonic Distortion (THD) at input AC mains along with near unity power factor. Performance comparison between open loop and closed loop of the proposed converter is made without filtering. The problems arise with open loop is sufficiently minimized by using power factor correction controller. The performance comparison between proposed and conventional CUK AC-DC converter operating in Continuous Conduction Mode (CCM) is made based on circuit simulations using PSIM softwere.

A Single-Phase AC/DC Conversion Circuit with APFC

2015 ◽  
Vol 740 ◽  
pp. 490-494
Author(s):  
Wei Chen ◽  
Ze Sen Shi ◽  
Yi Li Zhou ◽  
Qiang Chang ◽  
Wei Ping Wang
Keyword(s):  
Power Factor ◽  
Single Phase ◽  
Closed Loop ◽  
Power Factor Correction ◽  
Duty Ratio ◽  
Current Output ◽  
Bridge Rectifier ◽  
Current Value ◽  
Small Voltage ◽  
Circuit Power

This system uses the MSP430F6638 and FPGA as the core, includes full bridge rectifier circuit, power factor correction circuit, Boost/Buck circuit and sample circuit. According to the sampling voltage and current value, The FPGA adjusts PWM wave duty ratio of power factor correction chip UC3854, completing single phase AC/DC conversion circuit with a voltage outer closed-loop and current inner closed-loop and active power factor correction (APFC). Test shows that the output voltage can stable in a setting value, with amplitude range ±0.05V, and when load’s impedance changes, this circuit can keep a small voltage adjustment rate and load adjustment rate. We use electronic parameter measurement device to measure the efficiency of AC/DC converter in a specified condition (voltage input Us=24V, current output Io=2A, voltage output Uo=36V), result demonstrates it’s a relatively ideal value. At the same time, under the control of UC3854, the power factor of alternating current input is 0.9734.And when we set the range of power factor between 0.8~1.0, The circuit can automatically adjust the power factor to track the set value.

Analysis and Design of Single Phase AC-DC Modified SEPIC Converter

2014 ◽  
Vol 573 ◽  
pp. 108-114
Author(s):  
J. Gnana Vadivel ◽  
K. Sree Revathy ◽  
S.T. Jaya Christa ◽  
N. Senthil Kumar
Keyword(s):  
Power Factor ◽  
Single Phase ◽  
Electronic Devices ◽  
Power Electronic ◽  
Loop Analysis ◽  
Analysis And Design ◽  
Switching Losses ◽  
High Power Factor ◽  
Converter Topologies ◽  
Conduction Mode

Power electronic devices with front-end rectifier are widely used in industry, commerce and transportation, which result in low power factor. Though there are several proposed solutions to this, Single Ended Primary Inductance Converter (SEPIC) converter was the most successful one. But the conventional SEPIC converters suffer from high switching losses. Hence in this paper, a modified SEPIC converter is used to improve the power factor at the mains side. This paper presents the simulation and analysis of single phase single-switch, converter topologies of AC-DC SEPIC converter and modified SEPIC converter for Continuous Conduction Mode (CCM) of operation with 48V, 100W output power. The results of SEPIC converter and modified SEPIC converter are compared for closed loop analysis in simulation which is done in PSIM. It is found that modified SEPIC converter has high regulated output voltage and high power factor.

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