A single‐stage phase‐shifted full‐bridge AC/DC converter with variable frequency control

Abstract

SUMMARYThis letter presents a single-stage soft-switched full-bridge AC/DC converter for low-voltage/high-current output applications. A phase-shifted method with a variable frequency control is used to regulate the DC bus voltage and the output voltage of the single-stage AC/DC converter. The proposed circuit topology and control scheme exhibit superior performances (i.e. high power factor, high-efficiency, and ring-free features). Correspondingly, a laboratory prototype, 500 W 5V/100A AC/DC converter, is implemented to verify the feasibility of the proposed design.

Efficiency of magnetic coupled boost DC‐DC converters mainly dedicated to renewable energy systems: influence of the coupling factor

“…Equation (15) can be also written with the expression of the various reluctances as follows: Equation (15) can be also written with the expression of the various reluctances as follows:…”

“…In this study, the generalized concepts of system energy parameters of DC-DC converters are introduced and applied to the transient analysis. As examples, one can note high-intensity discharge lamp ballasts used in automotive head lamps or the front-end converter with dual inputs (a main AC grid and battery-based DC power supply) developed to substitute the common but complex uninterruptible power supply in computer and telecommunication industries [7].Many research activities around the world are focused to the study and optimizations of boost converters [8][9][10][11][12][13]; some papers discuss the circuit theory aspects or practical realizations [14][15][16]; others are dedicated to the modeling of the DC-DC converters [17][18][19][20]; others are mainly oriented to specific applications such as renewable energy systems that concern us in this article [5,21,22]. The simulation results are compared with those of the behavioral study, deduced from the model pointing out the large influence of the coupling factor value on the global behavior and mainly on the value of the recovery voltage, in all the various parts of the switching cycle.…”

“…Many research activities around the world are focused to the study and optimizations of boost converters [8][9][10][11][12][13]; some papers discuss the circuit theory aspects or practical realizations [14][15][16]; others are dedicated to the modeling of the DC-DC converters [17][18][19][20]; others are mainly oriented to specific applications such as renewable energy systems that concern us in this article [5,21,22]. One can also refer to a review proposed by Kazimierczuk in a book describing the recent state-of-art of Pulse Width Modulation (PWM) DC-DC power converters [23].…”

Implementation and design of high‐power fast charger for lithium‐ion battery pack

“…A DC-DC full-bridge phase-shifted (FBPS) converter with the current-doubler rectifier features the low switching losses of power switches, and it has a low ripple current at the output side [5][6][7][8][9]. In the capacious systems, the applied Li-ion battery pack should be charged by a high-power fast charger (HPFC) due to it is hoped that the battery pack can be fully charged within 1 h. Therefore, HPFC with a power factor correction (PFC) rectifies the grid voltage into a moderately regulated DC voltage of near 400 V and reshapes the source current to follow a sinusoidal command.…”

Interleaved ZVS Resonant Converter with a Parallel-Series Connection

“…One is based on a constant switching frequency with a variable duty cycle, while the other is based on a constant duty cycle and a variable switching frequency. Power converters with constant switching frequency and zero voltage switching (ZVS) techniques, such as active clamped ZVS converters [1]- [5], asymmetric half-bridge converters [6]- [7] and phase-shift pulse-width modulation (PWM) converters [8]- [9], have been proposed for many years to reduce the switching losses of MOSFETs and to increase circuit efficiency. However, the ZVS effect of these techniques is limited to specific load conditions.…”