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Simulation of SEPIC Converter based-drive for Unipolar Brushless DC Motor  [cached]
Raghu Thumu
International Journal of Electrical and Computer Engineering , 2012, DOI: 10.11591/ijece.v2i2.306
Abstract: Front-end single-ended primary inductance converter (SEPIC) and a switch in series with each phase is proposed for driving a permanent magnet brushless dc (BLDC) motor with unipolar currents. All the switches are ground-referenced, which simplifies their gate drives. The available input voltage can be boosted for better current regulation, which is an advantage for low voltage applications. The SEPIC converter is designed to operate in the discontinuous conduction mode for operation with an ac supply. In this operation mode, the line current follows the line voltage waveform to a certain extent. The reduction in low-order harmonics and improved power factor is achieved without the use of any voltage or current sensors. The simplicity and reduced parts count of the proposed topology make it an attractive low-cost choice for many variable speed drive applications. The proposed topology is simulated and verified by using MATLAB/SIMULINK.
Kvasiresonant DC-DC Converter with Switching at Zero Current - Part 1
P. Vorel
Radioengineering , 1998,
Abstract: A kvasiresonant DC - DC converter and its control circuits are proposed. The relations useful for design of the converter will be deduced in the part 2. The fundamental idea of the converter is the switching -on and -off a transistor at zero current. In this way the switching losses are eliminated. It enables to design a converter with a large output power (several kW), high switching frequency (about 200 kHz), very good efficiency and low radiation.
International Journal of Electrical, Electronics and Data Communication , 2013,
Abstract: A SEPIC (Single-Ended Primary Inductor Converter) is a DC-DC converter, capable of operating both in stepup or step-down mode and widely used in battery-operated applications. There are two possible modes of operation in the SEPIC converter: Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). This paper presents modeling of a SEPIC converter operating in CCM using the State-Space Averaging (SSA) technique. SEPIC converter consists of two inductor and two capacitor hence it is fourth order dc-dc converter. Design of feedback compensator for fourth order system is quite complex. In this paper, model order reduction technique is used for controller design of SEPIC converter. First small signal dynamic model for SEPIC converter is obtained using SSA technique which provides fourth order transfer function. Then this fourth order transfer function is reduced to second order using Padé approximation. Then the compensator is designed for the reduced order model of the SEPIC converter. Result shows that the compensator designed for reduced order model gives the quite satisfactory response with the original system
Kvasiresonant DC-DC Converter with Switching at Zero Current - Part 2
P. Vorel
Radioengineering , 1998,
Abstract: A kvasiresonant DC - DC converter and its control circuits were proposed in the part 1 of the article. The relations useful for design of the converter will be deduced in this part 2. Relations and their numbers of the part 1 will be accepted.
Design and Simulation of a soft switching scheme for a dc-dc Boost Converter with pi controller
X.Felix Joseph,S.Pushpa Kumar,D.Arun Dominic,D.M.Mary Synthia Regis Prabha
International Journal of Engineering , 2010,
Abstract: This paper presents the design of simple but powerful soft switching scheme for a DC-DC Boost Converter with a closed loop control. A new novel soft switching scheme is proposed with a single switch and minimum components which offers load independent operations. The only switch used in this converter is switched ON at zero current and switched OFF at zero voltage .The proposed Controller is used to improve the dynamic performance of DC-DC converter by achieving a robust output voltage against load disturbances. The duty cycle of the Boost converter is controlled by PI Controller. A 50W/50KHz soft switched PWM Boost converter is simulated and analyzed. The results are simulated using PSIM
A New Zero Voltage Switching Buck-Boost Type DC-DC Converter
Majid Delshad
Majlesi Journal of Electrical Engineering , 2010, DOI: 10.1234/mjee.v4i1.149
Abstract: In this paper, a new zero voltage switching isolated buck-boost DC-DC converter with active clamp circuit is proposed. The active clamp circuit in this converter not only absorbs voltage spikes across the main switch but also provides soft switching conditions for all switches. All switches are PWM controlled which simplifies the control implementation. One of the main advantages of this converter is the that it operating can operate at high power levels while soft switching conditions exist in both buck and boost modes of converter operation. Since this converter can operate over a wide input voltage range, it can be employed in power factor correction. The experimental results obtained from a 150W prototype circuit operating at 100KHz are presented to confirm the integrity of the proposed circuit.
A Novel Topology of Single-Phase AC-DC Integrated Boost-SEPIC (IBS) Converter Using Common Part Sharing Method (CPSM) for High Step-Up Applications  [PDF]
Mohammad Bazlur Rashid, Mohammad Abdul Moin Oninda, Fahim Faisal, Mirza Muntasir Nishat, Golam Sarowar, Md. Ashraful Hoque
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.66003
Abstract: A novel topology of Integrated Boost-SEPIC (IBS) AC-DC converter using common part sharing method (CPSM) has been proposed in this paper. Conventional boost converters with bridge rectifier configuration are inefficient due to limited voltage step-up ratio which may not be applicable for high step-up applications as in the case of micro generators. The proposed IBS topology is based on the common part sharing method capable of operating both for positive and negative half cycle of the input signal. Result and simulation were conducted using PSIM environment. The proposed AC-DC IBS topology eliminates the requirement of bridge rectifier achieving high efficiency (about 99%), improved power factor (0.75, leading) and lower THD (about 38.8%) which is within IEEE standard.
Indian Streams Research Journal , 2012,
Abstract: This paper presents on a new high power full bridge isolated current fed dc/dc Converter with an active clamp. A proposed current fed dc/dc converter with high efficiency and voltage boosting capability is designed for use in the interface between a low voltage fuel cell source and a high voltage dc bus for inverters.ZVS scheme in all active switches is achieved for using a soft switching scheme. The switching losses and the conduction losses are reduced and the performance of the drive system should be increased from the proposed model. The proposed converter system is controlled by SPWM Technique. The simulation results are carried out and presented.
Soft switching DC/DC converter using auxiliary circuits
Vladimír Ru??in,Jaroslav Dudrik
Journal of Electrical and Electronics Engineering , 2008,
Abstract: A novel auxiliary circuit for full-bridge PWMDC/DC converter with controlled secondary side rectifieris presented in this paper. Zero-current turn-on for allpower switches of the inverter is achieved for full loadrange from no-load to short circuit by using controlledrectifier and auxiliary circuit on the secondary side.Modified phase shift PWM control strategy is used for theconverter. The principle of operation is explained andanalyzed and the simulation results are presented.

Xu Jianping,

电子与信息学报 , 1992,
Abstract: The zero-voltage quasi-resonant boost switching DC-DC converter have been investigated by using the time averaging equivalent circuit approach of periodically switching linear networks. The DC steady state and the AC small signal characteristics of the converter are also given.
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