A Novel Bridgeless Single-Stage Step-Up Rectifier (original) (raw)
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Bridgeless Power Factor Correction Boost Rectifier
Most electronic and electrical appliances such as radio, televisions, computers, etc. uses DC supply internally. This is done by converting the source supply (single phase or three phase) into DC supply. The internal DC supply source makes the load compatible with its external power source. The presence of non-linear loads results into low Power Factor operation of the power system. Several techniques are adopted for Power Factor correction and harmonic reduction technique few of them have gained greater acceptance over the others. In this paper some of the bridgeless power factor correction boost converters are proposed which results in improved power factor and reduced harmonics content in input line currents as compared to conventional boost converter topology. In addition the bridgeless Power Factor correction boost converter is proving to have less conduction losses and has higher efficiency. Keywords-Total Harmonic Distortion (THD), Bridgeless Power Factor Correction (PFC) Boost Rectifier, Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), Dual Boost PFC Rectifier, Fast-Recovery Diodes, Single Phase Rectifier
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A high step-up bridgeless single phase acedc power factor correction (PFC) rectifier based on Cuk topology is proposed for high voltage battery charger application. The proposed topology is designed to operate in the discontinuous conduction mode (DCM) to achieve the following advantages: simple control, high power factor, soft switching at turn on and low harmonic content of the line input current. In addition, the proposed converter exhibits low inrush current and low magnetic emission rate similar to the conventional Cuk topology. Besides, all the inductors in converter can be coupled on the same magnetic core, hence high power density is also possible. Compared to the conventional Cuk converter, the proposed bridgeless topology has lower conduction losses and higher voltage gain. Simulation and experimental results are presented along with the theoretical analysis.
Bridgeless SEPIC Rectifier With Unity Power Factor and Reduced Conduction Losses
In this paper, a new bridgeless single-phase ac-dc converter with an automatic power factor correction (PFC) is proposed. The proposed rectifier is based on the single-ended primary inductance converter (SEPIC) topology and it utilizes a bidirectional switch and two fast diodes. The absence of an input diode bridge and the presence of only one diode in the flowingcurrent path during each switching cycle result in less conduction loss and improved thermal management compared to existing PFC rectifiers. Other advantages include simple control circuitry, reduced switch voltage stress, and low electromagnetic-interference noise. Performance comparison between the proposed and the conventional SEPIC PFC rectifier is performed. Simulation and experimental results are presented to demonstrate the feasibility of the proposed technique.
IEEE Transactions on Power Electronics, 2017
Conventional single-phase power-factor-correction (PFC) rectifiers with active power decoupling capability typically require more than three active switches in their circuits. By exploring the concept of powerbuffer cell, a new single-stage PFC rectifier with two active switches, one inductor and one small powerbuffering capacitor is reported in this paper. The proposed converter can achieve high power factor, wide output voltage range, and power decoupling function without using electrolytic capacitor. Additionally, an automatic power decoupling control scheme which is simple and easy to implement is proposed in this paper. The operating principle, control method, and design considerations of the proposed rectifier are also provided. A 100 W prototype with AC input voltage of 110 Vrms and a regulated DC output voltage ranging from 30 V to 100 V has been successfully designed and practically tested. The experimental results show that with only a 15 μF power-buffering film capacitor, the proposed converter can achieve an input power factor of over 0.98, peak efficiency of 93.9%, and output voltage ripple of less than 3%, at 100 W output power.
Structures of transformerless step-up and step-down controlled rectifiers
Iet Power Electronics, 2008
New single-switch structures of single-and three-phase transformerless controlled rectifiers are proposed and analysed. These structures consist of a common rectifier, an input inductor filter, a high-frequency operated switch and a diode-capacitor ladder network. The latter, in its known application as a multiplier, is used for increasing the input voltage. A new scheme of a diode-capacitor network, which can be used as a divider to reduce the input voltage, is also proposed. The detailed analysis of the steady-state mode is performed and simple formulas for the calculation of step-up and step-down rates of the voltage are derived. Transient analysis of the proposed circuits, by solving the recurrent equations and by using the z-transform, is also performed. Since the proposed schemes do not consist of any transformers and/or any inverters, their operation is very efficient; no high harmonics and/or a DC component are produced, and so the input current and voltage waveform are close to the sinusoid. The power factor of such structures reaches unity and their weight is low, compared with those having a transformer. A laboratory model of one of the proposed structures has been built and tested. The experimental results confirm the converters efficiency and the correctness of the theoretical analysis.
Bridgeless single stage AC/DC converter with power factor correction
Bulletin of Electrical Engineering and Informatics, 2022
This research paper proposes a novel bridgeless single-stage isolated converter with power factor correction and load voltage control. The proposed converter reduces the input diode bridge requirement with reduced passive components and provides a unidirectional flow of power to the load. The single-stage design reduces the use of an electrolytic capacitor, which improves reliability and reduces the size of the converter. The proposed control method is based on a single proportional integral (PI) controller to achieve both power factor correction and input current control. The proposed bridgeless converter is suitable for electric vehicle (EV) charging. A simulation study is performed on the MATLAB/Simulink to verify the effectiveness of the proposed converter. The converter is implemented in the laboratory to obtain the experimental results using typhoon hardware in the loop (HIL) based real time simulator.
BRIDGELESS SEPIC POWER FACTOR CORRECTION RECTIFIER
this paper, the Single Ended Primary Inductor converter (SEPIC) is used to achieve high power factor with reduced input current ripple. The conventional power factor correction suffers from high conduction losses due to the diode bridge at the input side. Thus bridgeless SEPIC converter is used to avoid conduction loss by using only two semiconductor switches in the current flowing path during each switching cycle. By implementing the improved topology in DCM
Non-isolated single stage PFC rectifier for wide-input large step-down voltage applications
International Journal of Power Electronics, 2010
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input applications. The proposed topology utilises two synchronised non-floating power switches with low current stress. Additional features are gained when the converter operates in discontinuous conduction mode (DCM). These features include low semiconductors voltage stress, zero-current switch at turn-on, and simple control with a fast well-regulated output voltage and near unity input power factor. Closed form equations of the design constraints for the proposed topology are presented. Simulation and experimental results are presented to demonstrate the feasibility of the proposed technique.
High Efficiency Bridgeless Single-Power-Conversion Battery Charger for Light Electric Vehicle
This paper explains the charging batteries of light electric vehicles require chargers with high efficiency and a high-power factor. To meet this need, this paper presents a bridgeless single-power-conversion battery charger composed of an isolated step-up AC-DC converter with a series resonance circuit. The bridgeless configuration reduces the conduction losses associated with the input diode rectifier, and the series-resonance circuit reduces the reverse recovery losses of the output diodes by providing zero current switching. In addition, direct and series-resonance current injection enables bidirectional core excitation by the transformer, thereby allowing high power capability. The control algorithm derived from feedback linearization is also developed, which allows the proposed charger to correct the power factor and regulate the output power in a single-stage power conversion. This simple circuit structure leads to high efficiency and a high-power factor. The theoretical concepts of the proposed charger are verified experimentally using a 1.7 kW prototype.
Bridgeless Modified SEPIC Rectifier with Extended Gain for Universal Input Voltage Applications
A new single-phase ac–dc PFC bridgeless rectifier with multiplier stage to improve the efficiency at low input voltage and reduce the switch-voltage stress is introduced. The absence of an input rectifier bridge in the proposed rectifier and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved thermal management compared to the conventional full bridge topology. Lower switch voltage stress allows utilizing a MOSFET with lower RDS-on. The proposed topology is designed to operate in discontinuous conduction mode (DCM) to achieve almost a unity power factor and low total harmonic distortion (THD) of the input current. The DCM operation gives additional advantages such as zero-current turn-on in the power switches and simple control circuitry.