Soft single switch resonant buck converter with inherent PFC feature

This study presents a bridgeless single-phase step-down power factor correction (PFC) converter. The proposed converter consists of a buck converter in positive half-line cycle and a flyback converter in the negative one. The dead angle of input line current is omitted so high power factor (PF) and low total harmonic distortion (THD) are obtained. There are just two simultaneously conducting semiconductor devices in the charging path of buck and flyback inductors that reduce the conduction losses. A 80 W, 24 V experimental prototype verifies the operation of the proposed rectifier and a PF of 0.995 and THD <10% can be achieved.

Section: Inductors and Output Capacitormentioning

confidence: 99%

Bridgeless single‐phase step‐down PFC converter

Malekanehrad

Adib

2016

“…A conventional interleaved buck PFC converter operating in boundary conduction mode (BCM) with half-input current ripples was proposed in [14]. In [15], a conventional soft single switch resonant buck PFC converter with improved efficiency was presented. Nevertheless, for the conventional buck PFC converter, when the output voltage is higher than the input voltage, the undesired dead zones in input current occur around crossing-zero point inevitably since the input diodes and power switch cannot be turned on.…”

Section: Introductionmentioning

confidence: 99%

AC–DC bridgeless buck converter with high PFC performance by inherently reduced dead zones

Lin

Wang

2018

In this study, a novel AC-DC bridgeless buck converter for power-factor-correction (PFC) applications with the inherent current-shaping ability and high PFC performance is proposed. Under a certain operation condition, dead zones in the proposed converter are reduced inherently compared with its conventional buck PFC counterpart, which result in higher PF and lower total harmonic distortion significantly. Furthermore, two rectifier diodes are eliminated, which contributes to efficiency. The detailed operation principle and theoretical analysis of discontinuous conduction mode (DCM) are presented. The simulation comparison between the conventional and proposed bridgeless buck PFC converter is also described. Finally, an experimental lab-made prototype operating in DCM is constructed to validate the feasibility of this proposed converter. 2 Operation principle Here, the DCM is designed in the proposed converter. In positive line cycles, it operates in buck mode. In negative line cycles, it IET Power Electron.

“…To improve the input PF and input current harmonics of the conventional buck PFC converter, some new control methods and new topologies are proposed [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…Amongst them, buck PFC converter is a good choice especially for a broad range of ac–dc applications due to its several advantages such as high efficiency, cost reduction, low output voltage and lifetime improvement. Moreover, owing to the advantage of being suitable for universal input, buck PFC converter is often used as a pre‐regulator [17–37].…”

Section: Introductionmentioning

confidence: 99%

UPC strategy and implementation for buck–buck/boost PF correction converter

Memon

Yao

2018

Nowadays, low power factor (PF) is a serious problem that has gained more importance in power electronics area. In this study, a unity PF control (UPC) strategy for boundary conduction mode (BCM) buck-buck/boost PF correction converter is proposed. The proposed control strategy can achieve high PF and low total harmonic distortion by utilising the input and output voltages to modulate the on-time of both buck and buck/boost switches. The operating principles and comparative analysis of BCM buck-buck/boost converter with conventional non-UPC and UPC are analysed. For verifying the effectiveness of the proposed control strategy, the experimental verifications are carried out from a 100 W universal input prototype.