Zero-current switching resonant buck converters with small inductors

In this study, a new family of soft-switching pulse-width-modulated (PWM) converters with a lossless passive snubber is introduced. The switch is turned on under zero-current switching and turned off under zero-voltage switching and all diodes turn on and off under soft switching conditions. The proposed snubber consists of two resonant inductors a resonant capacitor and three diodes which can be applied to all non-isolated DC-DC converters. A buck converter with the proposed snubber is analysed and to verify theoretical analysis, a 100 W prototype is implemented and efficiency of converter compared with hard switching counterpart. Also to confirm the effectiveness of the proposed snubber to reduce conducted electromagnetic interference (EMI), the conducted EMI of a buck converter with proposed snubber cell is compared with conventional buck converter.

Section: Introductionmentioning

confidence: 99%

“…In resonant converters [1][2][3], a resonant tank is added to the converter to achieve soft switching without any extra switch, but in these converters, output power is controlled by varying the switching frequency. Therefore, magnetic elements cannot be designed optimally.…”

Section: Introductionmentioning

confidence: 99%

A new family of non‐isolated PWM DC–DC converter with soft switching

Gerami

Delshad

Amini

et al. 2019

“…Switched resonator converters (SwRC) are a category of soft-switching converters that only use a small resonant inductor. The drawback of these converters is employing more than one switch in their topologies that can increase the total converter cost [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Switched resonator DC/DC converter with a single switch and small inductors

Amini¹,

Farzanehfard²

2014

A new single-switch, soft-switching buck converter is presented here. The converter switch is turned on and off at zero current switching condition without using any auxiliary switch. The operation of the proposed converter is based on a resonance between two small inductors and a small capacitor. As a result, the size and weight of the converter is reduced. The proposed converter is analysed and its operating modes are explained in detail. The design considerations of the proposed buck converter are presented. The experimental results of the prototype converter confirm the theoretical analysis. Finally, it is shown that the proposed converter can perform as a buck-boost converter by employing an additional switch.

“…Increasing switching frequency would reduce converter volume and weight but would result in higher switching stress, more switching loss and electromagnetic interference (EMI). To overcome these limitations and to increase operating switching frequency, soft-switching techniques have been highly developed and widely applied [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Another category of soft-switching converters are the quasi-resonant converters which are frequency controlled. Although these converters do not suffer from extra switches, their output filter cannot be optimally designed [5][6][7][8][9][10]. Also the operation of the converter is load dependent.…”

Section: Introductionmentioning

confidence: 99%

Soft single switch resonant buck converter with inherent PFC feature

Emrani

Amini

Farzanehfard

2013

In this study a new fully soft switched converter with a single switch is presented. The relatively small value of required passive circuit elements in this converter makes its implementation simple and cost-efficient. Since this converter operates at fully soft-switching conditions without any extra switches and low number of circuit components, the proposed converter is highly efficient. The other advantage of this converter is its inherent power factor correction (PFC) feature. In this study, the proposed converter is introduced and its theoretical analysis is presented. Also a prototype converter is implemented and the experimental results are presented to verify the theoretical analysis.