scholarly journals Soft Switching of Non-Isolated Buck-Type Converter with Common-Ground Switch

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5290
Author(s):  
Yeu-Torng Yau ◽  
Kuo-Ing Hwu ◽  
Jenn-Jong Shieh
Keyword(s):  
Common Ground ◽  
Pulse Width Modulation ◽  
Buck Converter ◽  
Control Technique ◽  
Theoretical Derivation ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Time Division ◽  
Zero Voltage

A non-isolated buck converter, together with resonance and zero voltage transition to achieve zero voltage switching (ZVS) and zero current switching (ZCS), is presented herein to upgrade the conversion efficiency. In this circuit, the main switch and the auxiliary switch are connected to the common ground so as to make the two switches easily driven. Furthermore, these two switches take time division multiplexing operation. In addition, the pulse width modulation (PWM) control technique is utilized so as to render the output inductor and capacitor easily designed. In this paper, the theoretical derivation is first introduced, and secondly, some experimental results are provided to demonstrate the effectiveness of the proposed topology.

scholarly journals Soft Switching of Full-Bridge DC-DC Buck Converter

2020 ◽  
pp. 561-565
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Distribution Systems ◽  
Buck Converter ◽  
Soft Switching ◽  
Power Supplies ◽  
Power Circuit ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current

The conventional Bidirectional Full-bridge dc -dc converter is inefficient and may not be practical for the low power applications. This paper specifies an efficient DC-DC Converter that avoids power losses by using soft switching techniques like Zero Voltage Switching and Zero Current switching. The soft switching of Bidirectional Full-bridge DC-DC Converter operates as a buck converter when the power is positive and as a boost converter when the power flow is negative. Applications of soft switching Bidirectional Full-bridge DC-DC Converter are uninterrupted power supplies (UPS), distribution Systems, battery charger circuits, telecom power supplies, computer power systems. Detailed analysis of the converter is carried out in buck mode to obtain relations between the power circuit parameters. Based on the analysis, control schemes are described to operate the converter. The proposed full bridge DC-DC converter is simulated in Buck mode using MATLAB /SIMULINK.

scholarly journals Resonant Hybrid Flyback, a New Topology for High Density Power Adaptors

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 363 ◽  
Author(s):  
Alfredo Medina-Garcia ◽  
Manfred Schlenk ◽  
Diego Morales ◽  
Noel Rodriguez
Keyword(s):  
Power Density ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Full Range ◽  
Input Voltage ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Class Power ◽  
World Class

In this article, an innovative power adaptor based on the asymmetrical pulse width modulation (PWM) flyback topology will be presented. Its benefits compared to other state-of-the-art topologies, such as the active clamp flyback, are analyzed in detail. It will also describe the control methods to achieve high efficiency and power density using zero-voltage switching (ZVS) and zero-current switching (ZCS) techniques over the full range of the input voltage and the output load, providing comprehensive guidelines for the practical design. Finally, we demonstrate the convenience of the proposed design methods with a 65 W adaptor prototype achieving a peak efficiency of close to 95% and a minimum efficiency of 93.4% at full load over the range of the input voltage, as well as a world-class power density of 22 W/inch3 cased.

scholarly journals SINGLE PHASE REDUCED ORDER AC-AC RESONANT- FREQUENCY CONVERTER

2021 ◽  
Vol 9 (06) ◽  
pp. 663-672
Author(s):  
Anukriti Sharma ◽  
◽  
Navdeep Singh ◽  
Keyword(s):  
Resonant Frequency ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Frequency Converter ◽  
Simulation Software ◽  
Reduced Order ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Zero Current Switching ◽  
Zero Current

This paper presents the performance analysis of proposed circuit of Single-Phase Reduced Order AC-AC Resonant Frequency Converter. AC-AC converter is minimized number of switches for multi-operation and resonant converter is converter work on the principle of ZCS (Zero Current Switching) and ZVS (Zero Voltage Switching) combining both topology, which provide better output with reduce THD and switching losses. A mathematical modeling is done for proper value of used parameters in converter. The output of converter is improved by applying Modulation technique in this converter we are using Trapezoidal Pulse Width Modulation (TPWM) for the better performance and control. THD of the converter is calculated by using MATLAB simulation software. MATALB simulation of AC –AC Resonate Frequency Converter is done by using MOSFET as switch.

scholarly journals A Novel Three-Phase Six-Switch PFC Rectifier with Zero-Voltage-Switching and Zero-Current-Switching Features

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1119 ◽  
Author(s):  
Chun-Wei Lin ◽  
Chang-Yi Peng ◽  
Huang-Jen Chiu
Keyword(s):  
Switching Loss ◽  
Modeling And Analysis ◽  
Zero Voltage Switching ◽  
Current Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Three Phase ◽  
The One ◽  
Zero Voltage ◽  
Voltage Switching

A novel three-phase power-factor-correction (PFC) rectifier with zero-voltage-switching (ZVS) in six main switches and zero-current-switching (ZCS) in the auxiliary switch is proposed, analyzed, and experimentally verified. The main feature of the proposed auxiliary circuit is used to reduce the switching loss when the six main switches are turned on and the one auxiliary switch is turned off. In this paper, a detailed operating analysis of the proposed circuit is given. Modeling and analysis are verified by experimental results based on a three-phase 7 kW rectifier. The soft-switched PFC rectifier shows an improvement in efficiency of 2.25% compared to its hard-switched counterpart at 220 V under full load.

scholarly journals An Interleaved DC/DC Converter with Soft-switching Characteristic and high Step-up Ratio

2020 ◽  
Vol 10 (6) ◽  
pp. 2167
Author(s):  
Yong-Nong Chang ◽  
Hung-Liang Cheng ◽  
Hau-Chen Yen ◽  
Chien-Hsuan Chang ◽  
Wei-Di Huang
Keyword(s):  
Conversion Efficiency ◽  
Operation Mode ◽  
Soft Switching ◽  
Switching Characteristic ◽  
Boost Converters ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Current Ripples ◽  
Zero Voltage

This study presents a dc/dc converter featuring soft-switching characteristic, high conversion efficiency, and high step-up ratio. The proposed circuit is composed of two parallel-connected boost converters. Only one coupled inductor is used to replace inductors of the boost converters which are interleaved operated at discontinuous-conduction mode (DCM). The current ripples at the input and the output terminals are reduced due to the interleaved operation. By freewheeling the current of the coupled inductor to discharge the stored electric charges in the parasitic capacitors of the active switches, both active switches can fulfill zero-voltage switching on (ZVS). Owing to DCM operation, the freewheeling diodes can fulfill zero-current switching off (ZCS). Therefore, the power conversion efficiency is improved. The operation principle for each operation mode is analyzed in detail and design equations for the component parameters are provided in this report. Finally, a prototype 200 W 48–400 V converter was implemented and measured to demonstrate the effectiveness of the proposed circuit.

Sign in / Sign up

Export Citation Format

Share Document