A Dual Series-Resonant DC–DC Converter

A double passive lossless snubber (DPLS) is applied to a pulse width modulation two-switch flyback converter (TSFC). The DPLS, which has two capacitors, two inductors, and four diodes, has achieved zero voltage turn off and zero current (ZC) turn on for power switches without high voltage and current stresses; ZC turn on and ZC turn off for a rectifier diode without a reverse recovery problem. In this study, the steady-state operating modes of TSFC-DPLS are analysed and the proposed converter design procedure to operate in the continuous conduction mode is taken. To validate the theoretical analysis, a 240 W prototype TSFC-DPLS under an 85-135 V rms input, 24 V DC output, and 300 kHz is implemented. Finally, by utilising the experimental results, the soft switching conditions under wide input voltage and output load ranges are discussed.

Section: Power Loss Analysis and Comparisonmentioning

confidence: 99%

“…To reduce the drawbacks of the LLC HB converters, the asymmetrical half bridge has been proposed in [27][28][29]. These converters are controlled with a simple pulse width modulation (PWM) controller, and ZVS turn on is achieved inherently for power switches.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of two‐switch flyback converter with double passive lossless snubber

Soltanzadeh

Yousefi

2018

“…Using flying capacitors, the input split voltages can be balanced automatically without complex control schemes, while connecting half-bridge circuit cells in series the voltage stress on them can be reduced [7]. A dual series resonant converter can operate with decreased switching losses on the diodes, while the power transfer to the output can be provided without any interruption among the negative and positive operation cycles [8]. In a high step-up resonant converter, an input-current doubler and a special switching mechanism can be used to accomplish high step-up voltage gain to avoid a high turn-ratio transformer [9].…”

Section: Introductionmentioning

confidence: 99%

Control features of a four channel resonant buck converter

Litvani

Hamar

2019

This study presents the steady-state behaviour of a new four channel resonant DC/DC buck converter in symmetrical operation both in continuous current conduction mode (CCM) and in discontinuous current conduction mode (DCM). Having two inputs and four outputs, one of the most important advantages of this converter is its capability to provide four identical or arbitrarily different output voltages, while power exchange between the input channels facilitates the smooth operation even when one of the inputs falls out (security power supply). The converter can be operated in zero-current switching and zerovoltage switching conditions that results in enhanced efficiency. The quasi-sinusoidal waveforms help to lower electromagnetic interference. The analysis revealed the relations among input and output voltages as well as the effect of control variables on the steady-state operation. The obtained theoretical results are verified by both computer simulations and measurements on a recently built experimental prototype. The analytical results and control characteristics are devoted to design such converters and develop control strategies for them.

“…However, its hard-switching operation reduces the conversion efficiency and elevates generated electromagnetic interference levels. Moreover, high power density demanded in modern electronics systems is not attainable by hard-switching operation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. For low-power on-chip applications, switchedcapacitor converter (SCC) is a suitable candidate since no magnetic element is required.…”

Section: Introductionmentioning

confidence: 99%

“…However, the spiky current created by charging and discharging of switching capacitors is problematic and degrades the converter efficiency and performance [2][3][4]. Then, by including a small resonant inductor, resonant switched capacitor converter (RSC) is developed that operates at zerocurrent switching (ZCS) [2][3][4][5][6][7][8][9][10]. This inductor can be a stray inductance [11].…”

Section: Introductionmentioning

confidence: 99%

Double‐boost switched‐resonator converter

Jabbari

Tehrani²

2018

A new high-efficiency resonant boost converter is presented. The topology is a hybrid circuit between switchedresonator and switched-capacitor converters. The proposed converter can efficiently provide voltage conversion ratio between 1 and 2. The voltage gain is adjustable, and full-range zero-current switching operation is provided for switches independent from operating voltages and load power. The structure is formed by an inverter arm without employing any additional switch in the circuit. Passive elements are all high-frequency resonant type and then small size realisation is possible. The converter stability is guaranteed. Complete theoretical analysis along with simulation and practical results are presented. Finally, the converter is compared with its most recent counterparts.