An Improved Bridgeless SEPIC Converter Without Circulating Losses and Input-Voltage Sensing

Ma, Hongbo; Li, Yuan; Lai, Jih‐Sheng; Zheng, Cong; Xu, Jianping

doi:10.1109/jestpe.2017.2768545

Cited by 49 publications

(27 citation statements)

References 21 publications

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“…The capacitance values for C i1 , C o1 and C o2 are given by (13) and (14). P o is the output power and t hold is the hold-up time [29].…”

Section: Capacitors Designmentioning

confidence: 99%

“…buck rectifiers). Commonly, SEPIC rectifiers operate in discontinuous conduction mode (DCM), because even without employing a current control, its behaviour is similar to a resistive load to the electrical grid and, thus, the converter drains a current with the same shape as that of the input voltage [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of the SEPIC rectifier, the multiplier SEPIC dc-dc converter in [19], the SC cell in [20], the hybrid rectifiers in [22], as well as the studies reported in [6][7][8][9][10][11][12][13] and mainly the previous studies presented in [23,24], this paper proposes a set of hybrid single-phase [SEPIC + SC] rectifiers, in which the SC cell is modified to work with a DCM SEPIC rectifier. Preliminary investigations of these rectifiers were approached in [23,24]; Costa et al [23] propose the modified ladder-type SC integrated with SEPIC rectifier and Costa et al [24] propose the modified laddertype SC integrated with bridgeless SEPIC rectifiers.…”

Section: Introductionmentioning

confidence: 99%

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Single‐phase hybrid discontinuous conduction mode SEPIC rectifiers integrated with ladder‐type switched‐capacitor cells

Kremes

Costa²,

Font

et al. 2019

IET Power Electronics

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In this study, a set of new single-phase pulse-width modulation (PWM) Single-ended primary-inductor converter (SEPIC) rectifiers are proposed, which integrates conventional SEPIC rectifier, three-state switch (TSS) and switched-capacitor (SC) concepts. A conventional ladder-type SC cell is modified so that it can be integrated with the SEPIC rectifier operating in discontinuous conduction mode. The set of new single-phase PWM SEPIC rectifiers are able to provide: (i) lower-voltage stress on the semiconductors; (ii) higher-output voltage; and (iii) a split-capacitor output voltage. The structure employs a TSS and three different implementations are proposed. Two of them are bridgeless versions, which can provide higher efficiencies. Hence, the proposed structures can support using the SEPIC rectifiers as step-up in many applications and thus it can broaden its field of use. The topologies and their topological states, a theoretical steady-state analysis, a theoretical analysis of the ladder-type SC cell integrated with the SEPIC rectifier, a dynamic model for the control and a design example are discussed herein. Furthermore, a 500 W prototype with a 220 V input voltage, two 200 V split-output voltages, 400 V total output voltage and 50 kHz switching frequency was designed to corroborate the theoretical study.

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“…The capacitance values for C i1 , C o1 and C o2 are given by (13) and (14). P o is the output power and t hold is the hold-up time [29].…”

Section: Capacitors Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single‐phase hybrid discontinuous conduction mode SEPIC rectifiers integrated with ladder‐type switched‐capacitor cells

Kremes

Costa²,

Font

et al. 2019

IET Power Electronics

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show abstract

“…Thus, a low‐cost structure is obtained as well as improvement in the converter's efficiency. (ii) Similar to the existing structure in [29], the input AC line voltage is always connected to the output ground through the slow‐recovery diodes D p and D n . Therefore, the issue on high common‐mode electromagnetic interference (EMI) emission can be resolved in the modified structure because the ground point is shared between the two diodes [37, 38]. (iii) By taking the positive‐half cycle as a reference from the existing structure [29], during the whole positive‐half line cycle, the metal–oxide–semiconductor field‐effect transistor (MOSFET) S keeps turned on and turned off with a switching frequency of 50 kHz and with the input inductor L 1 in operation.…”

Section: Modified Single‐switch Bridgeless Pfc Sepic Structurementioning

confidence: 99%

Modified single‐switch bridgeless PFC SEPIC structure by eliminating circulating current and power quality improvement

Noor

Ponniran

Rashid

et al. 2019

IET Power Electronics

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In this study, a modified single-switch bridgeless power factor correction (PFC) single-ended primary-inductor converter (SEPIC) structure is proposed. The major practical drawbacks of the existing structure are the presence of circulating current and high maximum current stress at the input capacitor and line diodes. Therefore, to overcome these problems, the existing structure is restructured by repositioning the line diodes in series with input inductors. Besides, the principle of design parameters optimisation is used based on the balancing energy compensation between input capacitors and output inductor. This structure is designed to operate in discontinuous conduction mode in order to achieve almost a unity power factor. The operation principle and design consideration of the modified structure is introduced in details. The experimental results demonstrate that the total harmonic distortion current is reduced from 56.3 to 4.9% after the optimisation process is performed, and at the same time the dead zones are inherently eliminated. Furthermore, it is shown that the output voltage ripple frequency is always double from the input line frequency of 50 Hz and the output voltage ripple is constantly lower than the maximum input voltage ripple. Thus, the designed parameters of the experimental converter are verified with ∼160 W of the converter output power.

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“…The state equation describing the behaviour of the CCM SEPIC converter [40], shown in Figure A1, is given by:…”

Section: Appendicesmentioning

confidence: 99%

SHIL and DHIL Simulations of Nonlinear Control Methods Applied for Power Converters Using Embedded Systems

et al. 2018

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In this work, a new real-time Simulation method is designed for nonlinear control techniques applied to power converters. We propose two different implementations: in the first one (Single Hardware in The Loop: SHIL), both model and control laws are inserted in the same Digital Signal Processor (DSP), and in the second approach (Double Hardware in The Loop: DHIL), the equations are loaded in different embedded systems. With this methodology, linear and nonlinear control techniques can be designed and compared in a quick and cheap real-time realization of the proposed systems, ideal for both students and engineers who are interested in learning and validating converters performance. The methodology can be applied to buck, boost, buck-boost, flyback, SEPIC and 3-phase AC-DC boost converters showing that the new and high performance embedded systems can evaluate distinct nonlinear controllers. The approach is done using matlab-simulink over commodity Texas Instruments Digital Signal Processors (TI-DSPs). The main purpose is to demonstrate the feasibility of proposed real-time implementations without using expensive HIL systems such as Opal-RT and Typhoon-HL.

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An Improved Bridgeless SEPIC Converter Without Circulating Losses and Input-Voltage Sensing

Cited by 49 publications

References 21 publications

Single‐phase hybrid discontinuous conduction mode SEPIC rectifiers integrated with ladder‐type switched‐capacitor cells

Single‐phase hybrid discontinuous conduction mode SEPIC rectifiers integrated with ladder‐type switched‐capacitor cells

Modified single‐switch bridgeless PFC SEPIC structure by eliminating circulating current and power quality improvement

SHIL and DHIL Simulations of Nonlinear Control Methods Applied for Power Converters Using Embedded Systems

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