Soft-switching Converter Research Articles

Aspects on SIC Switches for Soft-Switching Converters in an Industrial Application

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A High Efficient High Input Power Factor Interleaved Boost Converter

In this paper an improved ZVT interleaved boost PFC topology is introduced. The proposed ZVT interleaved boost converter is composed of two cell boost conversion units and an active auxiliary circuit. The proposed converter has two important advantages over the similar soft switching converters. The first one is that parallel to the main switches of the converter the auxiliary switch also operates under soft switching condition. Providing soft switching conditions for interleaved boost converters with more than one cells using only one auxiliary switch is another advantage of this topology. The prototype for the proposed converter was developed with an input of 110V-220V ac power supply feeding a resistive output load of 600 watts. In addition, the proposed converter has the advantages of fewer structure complications, lower cost and ease of control. DOI: http://dx.doi.org/10.11591/ijece.v2i3.254

An Overview to Soft Switching Converters with High Voltage Gain

A comparison is made in this paper between three high voltage gain converters. The first one is a boost converter with an additional level including a coupling inductor for increasing the voltage gain. The second is a converter that is capable to be extended to N parallel converter and the third one uses a clamp circuit to increase gain with a coupled inductor. Three converters are compared in voltage and current peak value and utilization coefficient of active switch and output diode, their ZVS and ZCS condition in the ON and OFF time and voltage gain. Finally the first converter circuit is simulated in PSpice with the two other converters input voltages and the results are compared.

Soft-Switching Boost Half-Bridge Converter with High Voltage Gain and Low Input Current Ripple

A soft-switching boost half-bridge converter with high voltage gain and low input current ripple is proposed in this paper. In the proposed converter, a coupled inductor is used at the boost converter stage to reduce the input current ripple. The half-bridge converter stage provides soft-switching operation and high voltage gain. Also, the reverse-recovery problem of output diodes is significantly alleviated by utilizing the leakage inductance of the transformer. Due to the soft-switching operation of all switching devices, the switching loss is significantly reduced and the high efficiency is obtained. The feasibility and performance of the proposed converter were verified on an experimental prototype

Design of High-efficiency Soft-switching Converters for High-power Microwave Generation

Design of High-efficiency Soft-switching Converters for High-power Microwave Generation

Experimental Study on Improved Phase-Shift Control Soft-Switching Converter

A novel phase-shifted Soft-switching converter is presented in this thesis，which is based on the Tou structural, groundwork of summarization of the development of lower Electronics in recent years and lucubration in theoretical basis of modern high frequency soft switching power convert technique and analysis of operation principle, characteristic of the circuit and inherent drawbacks of traditional phase-shifted Soft-switching converter. Explicit description of main circuit topology, operation principle, characteristic of the circuit of the novel phase-shifted Soft-switching converter as well as the simulation analysis with the PSPICE software is proposed. The main works that I did: The design involves calculation of transformer, inductor and capacitance in main circuit, parameter selection of each element and realization of control circuit. Electric circuit Tou structural is verified by emulation experiment. The electric circuit reduces availably switch exhaust of traditional soft switch transformation electric circuit. The experiment proved to the possibility of the reformed prefect. The experiment has important reference value to improved soft switch transformation.

태양광발전 시스템의 효율 개선을 위한 Newton Method MPPT제어 및 소프트 스위칭 컨버터 시뮬레이션

In this paper proposes the soft-switching boost converter and MPPT control for improving the efficiency of PV system. The proposed converter designed H-bridge auxiliary resonant circuit. By this circuit, all of the switching devices perform the soft switching under the zero voltage and zero current condition. Therefore the periodic switching losses can be decreased at turn on, off. The soft switching boost converter designs for 1.5[kW] solar module of the power conversion. Thus, this soft switching boost converter is simulated by MATLAB simulation using Newton-Method algorithm. As a result, Proposed Soft Switching Converter compared to a typical boost converter switching loss was reduced about 61%. And the overall system efficiency was verified to increase about 3.3%.

Analysis and Implementation of a DC-DC Converter with an Active Snubber

This paper presents a soft switching converter to achieve the functions of zero voltage switching (ZVS) turn-on for the power switches and dc voltage step-up. Two circuit modules are connected in parallel in order to achieve load current sharing and to reduce the size of the transformer core. An active snubber is connected between two transformers in order to absorb the energy stored in the leakage and magnetizing inductances and to limit the voltage stresses across the switches. During the commutation stage of the two complementary switches, the output capacitance of the two switches and the leakage inductance of the transformers are resonant. Thus, the power switches can be turned on under ZVS. No output filter inductor is used in the proposed converter and the voltage stresses of the output diodes is clamped to the output voltage. The circuit configuration, the operation principles and the design considerations are presented. Finally, laboratory experiments with a 340W prototype, verifying the effectiveness of the proposed converter, are described.

Implementation of an interleaved pulse‐width modulation converter for renewable energy conversion

SUMMARYThis paper presents an interleaved soft switching converter to achieve the features of zero voltage switching (ZVS) turn‐on for power switches, zero current switching turn‐off for rectifier diodes at full load, less transformer secondary winding with full‐wave diode rectifier topology, and balance primary currents with series connection of the transformer secondary windings. Two circuit modules are adopted in the proposed circuit, and they are operated with an interleaved pulse‐width modulation. Thus, ripple currents at the input and output sides are reduced. In each module, two ZVS converters using the same switches are operated with interleaved half switching cycle. The secondary windings of transformers are connected in series in order to ensure that the primary side currents are balanced. The full‐wave diode rectifier topology is used on the output side such that the voltage stress of rectifier diodes equals output voltage, rather than being two times the output voltage as in a conventional center‐tapped rectifier topology. Laboratory experiments with a 1000‐W prototype are provided to describe the effectiveness of the proposed converter. Copyright © 2011 John Wiley & Sons, Ltd.

Impact of Zero-Voltage Notches on Outputs of Soft-Switching Pulsewidth Modulation Converters

Motivated by the method to analyze the impact of dead time in hard-switching converters, this paper, for the first time, analyzes the impact of zero-voltage notches on the outputs of soft-switching pulsewidth modulation (PWM) converters. It proves that the output distortion of soft-switching converters due to their deviation voltage is independent of the direction of their output current. Hence, their compensation strategies require no sensor to detect the current's direction, which is required by dead-time compensation methods in hard-switching converters. A simple yet effective compensation algorithm is presented for soft-switching converters. The analysis result and effectiveness of the proposed algorithm are experimentally verified via a three-phase inverter that represents an important class of converters.

Interleaved soft-switching buck converter with coupled inductors

This paper presents an interleaved soft-switching buck converter with coupled inductors to extend duty ratio for high step-down voltage applications. In the proposed converter, a single-capacitor t...

An improved two-switch flyback converter with regenerative clamping

A novel soft-switching two-switch flyback converter is proposed in this article. This converter is composed of two active power switches, a flyback transformer and two passive regenerative clamping circuits. The proposed converter has the advantages of a low-cost circuit configuration, a simple control scheme, high efficiency, and a wide operating range. The circuit topology, analysis, design considerations and experimental results of the new flyback converter are presented.

A Fully Soft Switched Two Quadrant Bidirectional Soft Switching Converter for Ultra Capacitor Interface Circuits

This paper describes a two quadrant bidirectional soft switching converter for ultra capacitor interface circuits. The total efficiency of the energy storage system in terms of size and cost can be increased by a combination of batteries and ultra capacitors. The required system energy is provided by a battery, while an ultra capacitor is used at high load power pulses. The ultra capacitor voltage changes during charge and discharge modes, therefore an interface circuit is required between the ultra capacitor and the battery. This interface circuit must have good efficiency while providing bidirectional power conversion to capture energy from regenerative braking, downhill driving and the protecting ultra capacitor from immediate discharge. In this paper a fully soft switched two quadrant bidirectional soft switching converter for ultra capacitor interface circuits is introduced and the elements of the converter are reduced considerably. In this paper, zero voltage transient (ZVT) and zero current transient (ZCT) techniques are applied to increase efficiency. The proposed converter acts as a ZCT Buck to charge the ultra capacitor. On the other hand, it acts as a ZVT Boost to discharge the ultra capacitor. A laboratory prototype converter is designed and realized for hybrid vehicle applications. The experimental results presented confirm the theoretical and simulation results.

Active-clamp soft-switching step-up converter with high-voltage gain

An active-clamp soft-switching step-up converter with high-voltage gain is proposed. By utilising the active-clamp circuit, the voltages across the power switches in the proposed converter are clamped and the zero-voltage switching of the power switches is achieved. To increase the voltage gain, two voltage doubler rectifiers are connected serially and stacked on top of the clamp capacitor. Therefore high-voltage gain is obtained and soft-switching characteristic is achieved. Also, the voltage stresses of the power switches and the output diodes are effectively reduced. Theoretical analysis and performance of the proposed converter are verified on a 110 W experimental prototype operating at 110 kHz switching frequency.

Analysis and implementation of an interleaved soft switching converter

An interleaved soft switching converter with active snubber circuit is presented here. The active snubber circuit not only absorbs the energy stored in the leakage inductor but also achieves zero-voltage switching turn-on feature for power switches. Moreover, the resonant tank which is composed of the leakage inductor and resonant capacitor is used to achieve zero current switching turn-off feature for rectifier diodes at the secondary side of transformer. Hence, the reverse recovery problem can be eliminated. The operational principle and design consideration are discussed in detail. Finally, experimental results taken from a 600W prototype are presented to confirm the effectiveness of the proposed converter.

High-power factor three-phase ac–dc soft-switched converter incorporating zero-voltage transition topology in modular systems for high-power industry applications

In this study, a three-phase ac–dc converter using three single-phase pulse-width-modulated zero-voltage transition (ZVT), soft-switched boost converter in modular approach is presented. The novelty of the active snubber cell is that, it provides ZVT turn-on and zero-voltage switching (ZVS) turn-off for the main switch without extra current or voltage stress. Auxiliary switch is turned on near zero-current switching without additional voltage stress and turns off near ZVS. The input line current and output voltage are controlled by the proposed power factor correction (PFC) converter in very wide load range. This PFC converter has ease of control as well as a simple structure. In this study, detailed steady-state analysis of proposed converter is presented, and this theoretical analysis is verified exactly by 400 V, 1.5 kW and 100 kHz prototype. This prototype has total efficiency of 97.3% and 0.9996 power factor with input line sinusoidal current at full load.

Modeling of Photo Voltaic Arrays with Soft Switching Converter Design and Simulation for Maximum Power Point Tracking

Modeling of Photo Voltaic Arrays with Soft Switching Converter Design and Simulation for Maximum Power Point Tracking

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

This 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 r...

Analysis and Design of a Soft-Switching Boost Converter With an HI-Bridge Auxiliary Resonant Circuit

A new soft-switching boost converter is proposed in this paper. The conventional boost converter generates switching losses at turn on and off, and this causes a reduction in the whole system's efficiency. The proposed boost converter utilizes a soft-switching method using an auxiliary circuit with a resonant inductor and capacitor, auxiliary switch, and diodes. Therefore, the proposed soft-switching boost converter reduces switching losses more than the conventional hard-switching converter. The efficiency, which is about 91% in hard switching, increases to about 96% in the proposed soft-switching converter. In this paper, the performance of the proposed soft-switching boost converter is verified through the theoretical analysis, simulation, and experimental results.

High-power density miniscale power generation and energy harvesting systems

This paper reports design, analysis, evaluations and characterization of miniscale self-sustained power generation systems. Our ultimate objective is to guarantee highly-efficient mechanical-to-electrical energy conversion, ensure premier wind- or hydro-energy harvesting capabilities, enable electric machinery and power electronics solutions, stabilize output voltage, etc. By performing the advanced scalable power generation system design, we enable miniscale energy sources and energy harvesting technologies. The proposed systems integrate: (1) turbine which rotates a radial- or axial-topology permanent-magnet synchronous generator at variable angular velocity depending on flow rate, speed and load, and, (2) power electronic module with controllable rectifier, soft-switching converter and energy storage stages. These scalable energy systems can be utilized as miniscale auxiliary and self-sustained power units in various applications, such as, aerospace, automotive, biotechnology, biomedical, and marine. The proposed systems uniquely suit various submersible and harsh environment applications. Due to operation in dynamic rapidly-changing envelopes (variable speed, load changes, etc.), sound solutions are researched, proposed and verified. We focus on enabling system organizations utilizing advanced developments for various components, such as generators, converters, and energy storage. Basic, applied and experimental findings are reported. The prototypes of integrated power generation systems were tested, characterized and evaluated. It is documented that high-power density, high efficiency, robustness and other enabling capabilities are achieved. The results and solutions are scalable from micro (∼100 μW) to medium (∼100 kW) and heavy-duty (sub-megawatt) auxiliary and power systems.