A High Gain Buck PFC Synchronous Rectifier

Sharifi, Saeed; Babaei, Mohammad; Monfared, Mohammad

doi:10.1109/icee.2018.8472575

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…Under the balanced load, when the DC capacitor balancing control loops are disabled in the rectifier, substituting (17) into (22), v o can be rewritten as…”

Section: Balancing Control Of the DC Capacitor Voltagementioning

confidence: 99%

“…For the unbalanced load, when the duty cycle variations ∆d 1 and ∆d 2 are taken into consideration, substituting (20) into (22), v o can be deduced as…”

Section: Balancing Control Of the DC Capacitor Voltagementioning

confidence: 99%

“…However, they lack a pure sinusoidal input current due to the appearance of the dead zones within the waveform when the instantaneous input voltage is below the output DC voltage [21]. Consequently, buck PFC rectifiers often exhibit limited PF and high current distortion, making it difficult to comply with current harmonic requirements, particularly in lighting applications [22]. Furthermore, a modified SEPIC converter was proposed in [23] to achieve low-switchvoltage operation and high static gain at low line voltages.…”

Section: Introductionmentioning

confidence: 99%

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SEPIC-Boost-Based Unidirectional PFC Rectifier with Wide Output Voltage Range

Cheng,

Li,

Wang

et al. 2024

Electronics

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A novel unidirectional hybrid PFC rectifier topology based on SEPIC and boost converters is proposed, which is applicable to various industrial applications such as electric vehicle charging stations, variable speed AC drives, and energy storage systems. Compared to other rectifiers, the proposed SEPIC-boost-based rectifier exhibits continuous current on the AC side, lower voltage stress on the active switches, a wider range of DC output voltage, no auxiliary DC-DC converters, and a high step-up static voltage gain operating with low input voltage and a low step-up static gain for the high-input-voltage operation. These traits allow the SEPIC-boost-based rectifier to utilize smaller input-side harmonic filtering inductors and adopt active switches with lower voltage ratings, resulting in reduced conduction losses. Additionally, the proposed rectifier features power factor correction and high boost/buck voltage-gain capabilities, simplifying control for electric vehicle charging and expanding its range of applications. In this paper, the operating principle of the novel topology is presented first, and then the mathematical model of the proposed rectifier is built. Based on this, the comparison between the proposed topology and conventional boost and SEPIC converters is given. Furthermore, the control strategy, including the high-power-factor control and the balancing control to the DC capacitor voltages, is discussed. Finally, to validate the accuracy of the proposed rectifier’s theoretical research, a 500-W SEPIC-boost rectifier system has been constructed in the laboratory, generating a 200/120 Vdc output voltage from a 155 Vpk/50 Hz power source.

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“…Under the balanced load, when the DC capacitor balancing control loops are disabled in the rectifier, substituting (17) into (22), v o can be rewritten as…”

Section: Balancing Control Of the DC Capacitor Voltagementioning

confidence: 99%

“…For the unbalanced load, when the duty cycle variations ∆d 1 and ∆d 2 are taken into consideration, substituting (20) into (22), v o can be deduced as…”

Section: Balancing Control Of the DC Capacitor Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SEPIC-Boost-Based Unidirectional PFC Rectifier with Wide Output Voltage Range

Cheng,

Li,

Wang

et al. 2024

Electronics

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“…Is not easy to remove dead angles in buck PFCs. Several re-searchers aimed to minimize their impact such as Saeed Sharifi et al [19], who introduced a new buck PFC circuit with a Z-source network that smooths out the switching effect on the input power quality, Figure 2 The Z-Source circuit was initially proposed by B. Axelrod et al [20] with its main target to increase the voltage gain in buck converters. Fortunately, the new circuit introduces a new input inductor that not only increases the gain but also minimizes the stress on the switch and smooths out the input current dead zones.…”

Section: Single-stage Psumentioning

confidence: 99%

Multicell Power Supplies for Improved Energy Efficiency in the Information and Communications Technology Infrastructures

et al. 2021

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The rapid growth of the Information and Communications Technology (ICT) sector requires additional infrastructure, such as more micro-datacenters and telecom stations, to support the higher internet speeds and low latency requirements of 5G networks. The increased power requirements of the new ICT technologies necessitate the proposal of new power supplies, in an attempt to support the increase in energy demand and running costs. This work provides an in-depth theoretical analysis on the losses of the individual stages of commercially available PSU and proposes a new multicell PSU, the buck PFC converter, which offers a higher overall efficiency at varying load levels. The theoretical results are verified using simulation results, via a PSIM Thermal Module, and using experimental data. The results indicate that multicell structures can improve the overall PSU efficiency by 1.2% at 50% rated power and more than 2.1% at full power. Finally, taking into consideration the economic implications of this study, it is shown that the proposed multicell structure may increase the PSU costs by 10.78%, but the payback period is in the order of just 3.3 years.

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“…In the average current control, capturing the inductor or the switch current is extremely critical. One of the major applications of the ACC is power factor control [5]. In [6], a novel method for measuring the inductor current is proposed for digitally controlled synchronous buck converters based on switch node voltage.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

2021

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In this paper, a comparative analysis of the average switch/inductor current between ideal and non-ideal buck and synchronous buck converters is performed and verified against a standard LTspice model. The mathematical modeling of the converters was performed using volt-sec and amp-sec balance equations and analyzed using MATLAB/Simulink. The transients in the output voltage and the inductor current were observed. The transfer function of the switch current to the duty cycle (Gid) in open loop configuration for low-power converters operating in continuous conduction mode (CCM) was modeled using thestate space averaging (SSA) technique and analyzed using MATLAB/Simulink. Initially, using the volt-sec and amp-sec, balance equations for the converters were modeled. The switch current to duty ratio (Gid) was derived using the SSA technique and verified using standard average models available in LTspice software. Though the Gid was derived using various methods in earlier works, the analyses of parameters such as low frequency gain, stability, resonant frequency and the location of poles and zeros were not presented. It was observed that the converters were stable, and the non-ideal converter showed smaller resonant frequency than the ideal converter due to the equivalent series resistances (ESR) of the inductor and the capacitor. The non-ideal converters showed higher stability than the ideal converters due to the placement of the poles closer to the s-plane. However, the Gid of the non-ideal converters remained the same in the open loop configuration.

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A High Gain Buck PFC Synchronous Rectifier

Cited by 9 publications

References 14 publications

SEPIC-Boost-Based Unidirectional PFC Rectifier with Wide Output Voltage Range

SEPIC-Boost-Based Unidirectional PFC Rectifier with Wide Output Voltage Range

Multicell Power Supplies for Improved Energy Efficiency in the Information and Communications Technology Infrastructures

Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

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