scholarly journals High-Efficiency Design and Control of Zeta Inverter for Single-Phase Grid-Connected Applications

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 974 ◽  
Author(s):  
Woo-Young Choi ◽  
Min-Kwon Yang
Keyword(s):  
Single Phase ◽  
High Efficiency ◽  
Field Effect Transistors ◽  
The Body ◽  
Switching Frequency ◽  
Switching Losses ◽  
High Switching Frequency ◽  
Active Clamp ◽  
Synchronous Rectification ◽  
And Control

The conventional zeta inverter has been used for single-phase grid-connected applications. However, it has high switching losses to operate at high switching frequency in the continuous conduction mode (CCM). To address this drawback, this paper suggests a high-efficiency zeta inverter using active clamp and synchronous rectification techniques. The proposed inverter utilizes the active clamp circuit for reducing switching losses. The non-complementary switching scheme is adopted for not only clamping the switch voltage stresses, but also alleviating the circulating energy. In addition, the synchronous rectification is implemented for reducing the body diode conduction of power switches. By using the silicon carbide (SiC) metal oxide semiconductor field effect transistors (MOSFETs), the switching performance of the proposed inverter is improved. Its operation principle and control strategy are presented. A 220-W prototype has been designed and tested to evaluate the performance of the proposed inverter.

scholarly journals Pure Sinusoidal Output Single-Phase Current-Source Inverter with Minimized Switching Losses and Reduced Output Filter Size

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1556 ◽  
Author(s):  
Eka Rakhman Priandana ◽  
Toshihiko Noguchi
Keyword(s):  
Single Phase ◽  
Current Source ◽  
Switching Frequency ◽  
Phase Current ◽  
Current Source Inverter ◽  
Switching Losses ◽  
High Switching Frequency ◽  
Linear Amplifier ◽  
Output Filter ◽  
Filter Capacitor

This paper proposes a novel single-phase current-source inverter that generates a pure sinusoidal waveform with minimized switching losses and using a small-size output filter capacitor. The proposed method is investigated by incorporating a conventional multilevel current-source inverter with a linear amplifier. The conventional multilevel technique uses fundamental switching frequency instead of using high-switching frequency modulation for the H-bridge circuit. The linear amplifier such as class-A or class-D types has a function to reform the staircase waveform generated by the multilevel inverter into a pure sinusoidal by using superimposition technique. As a result, pure sinusoidal output current is generated with a small ripple and the system only requires a small output filter capacitor for smoothing the waveform. Based on the simulation and experimental results, the proposed system presents not only the optimal configuration, but also an option as to whether to obtain excellent power efficiency or very low output harmonic. Implications of the results and future research directions are also presented.

scholarly journals A High-Efficiency Three-Level ANPC Inverter Based on Hybrid SiC and Si Devices

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1159 ◽  
Author(s):  
Zhijian Feng ◽  
Xing Zhang ◽  
Jianing Wang ◽  
Shaolin Yu
Keyword(s):  
Silicon Carbide ◽  
High Efficiency ◽  
The Other ◽  
Switching Frequency ◽  
Parallel Operation ◽  
Switching Loss ◽  
Hybrid Scheme ◽  
Excellent Performance ◽  
Switching Losses ◽  
The Cost

Silicon carbide (SiC) devices have excellent performance, such as higher switching frequency and lower switching loss compared with traditional silicon (Si) devices. The application of SiC devices in inverters can achieve higher efficiency and power density. In recent years, the production process of SiC devices has become more mature, but the cost is still several times that of traditional Si devices. In order to balance cost and efficiency, replacing only some of the Si devices with SiC devices in a topology is a better choice. This paper proposed a high-efficiency hybrid active neutral point clamped (ANPC) three-level inverter which has only two SiC devices and the other devices are Si devices. A specific modulation strategy was applied to concentrate switching losses on the SiC devices and reduce the on-state loss through parallel operation during freewheeling intervals. Theoretical efficiency curves and experimental verification of the proposed hybrid scheme with Si-only and SiC-only schemes were carried out.

Designing of Improved Series Resonant Inverter with FPGA Controller for Heating Applications

2020 ◽  
pp. 2150088
Author(s):  
S. Dhayanandh ◽  
S. Manoharan
Keyword(s):  
High Frequency ◽  
Switching Frequency ◽  
Zero Voltage Switching ◽  
Resonant Inverter ◽  
Series Resonance ◽  
High Switching Frequency ◽  
Series Resonant ◽  
Higher Power ◽  
Series Resonant Inverter ◽  
And Control

Intensive utilization of Induction Heating (IH) innovations can be seen in numerous areas such as manufacturing industries, domestic or house hold and medicinal applications. The development of high switching frequency switches has encouraged the structure of high frequency inverters which are the key component of IH technology. Controlling the power output in a high frequency inverter for IH application is relatively complicated. This paper focuses on designing and developing a typical series resonance inverter and control it by FPGA-based controller. A MOSFET switch-based DC to AC converter is designed and Zero Voltage Switching (ZVS)-based switching strategy is accomplished to acquire less stress on switching devices and greater conversion efficiency. In this technique, secondary switched capacitor cell was proposed for resonant inverter of high frequency. To optimize the performance of the proposed inverter, the FPGA-based control system is implemented. Higher power density is the greatest advantage of this topology. The experimental and simulation model of the proposed series resonant inverter (SRI) for heating applications is developed and simulated using MATLAB/Simulink software.

scholarly journals Power Factor Corrector Based on Parallel Quasi- Resonant Pulse Converter with Fast Current Loop

2013 ◽  
Vol 3 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Yuriy Denisov ◽  
Serhii Stepenko
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Current Loop ◽  
Switching Frequency ◽  
Zero Current Switching ◽  
High Switching Frequency ◽  
Power Factor Corrector ◽  
Pulse Converter

Abstract The problems, devoted to power quality and particularly power factor correction, are of great importance nowadays. The key requirements, which should be satisfied according to the energy efficiency paradigm, are not limited only by high quality of the output voltage (low total harmonic distortion), but also assume minimal power losses (high efficiency) in the power factor corrector (PFC). It could be satisfied by the use of quasi-resonant pulse converter (QRPC) due to its high efficiency at high switching frequency instead of the classical pulse-width modulated (PWM) boost converter. A dynamic model of QRPC with zero current switching (ZCS) is proposed. This model takes into account the main features of QRPC-ZCS as a link of a PFC closed-loop system (discreteness, sharp changes of parameters over switching period, input voltage impact on the gain). The synthesized model is also valid for conventional parallel pulse converter over an active interval of commutation. The regulator for current loop of PFC was synthesized based on digital filter using proposed model by the criterion of fast acting.

A Novel Three-Phase Current Source Active Power Filter

2014 ◽  
Vol 667 ◽  
pp. 383-389
Author(s):  
Yu Xiong ◽  
Yu Ling Li ◽  
Yan Ping Guo ◽  
Bo Yang
Keyword(s):  
High Power ◽  
Current Source ◽  
Active Power Filter ◽  
Active Power ◽  
Switching Frequency ◽  
Current Harmonic ◽  
Power Filter ◽  
High Switching Frequency ◽  
Harmonic Components ◽  
And Control

A novel topology for efficient utilization of parallel inverters as current source active power filter (APF) for high-power applications is presented and analyzed. The proposed technique operates the master inverter with high-power low-switching-frequency devices to compensate the low-order large-amplitude current harmonic components and the slave inverter with low-power high-switching-frequency devices to compensate the high-order small-amplitude current harmonic components. This paper discusses the operating principle, main circuit and control system design. Simulation and experimental results are provided to demonstrate the viability of the scheme.

scholarly journals Dual Interleaved LLC Converter for High Power Applications and Wide Load Range

2019 ◽  
Vol 25 (3) ◽  
pp. 4-9
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos ◽  
Andrej Kanovsky
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Negative Impact ◽  
Power Converter ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Load Range ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Operational Range

Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

scholarly journals Analysis of Intrinsic Switching Losses in Superjunction MOSFETs Under Zero Voltage Switching

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1124
Author(s):  
Maria Rogina ◽  
Alberto Rodriguez ◽  
Diego G. Lamar ◽  
Jaume Roig ◽  
German Gomez ◽  
...  
Keyword(s):  
Simulation Models ◽  
Soft Switching ◽  
Energy Losses ◽  
Switching Frequency ◽  
Zero Voltage Switching ◽  
Power Transistors ◽  
Switching Losses ◽  
Light Load ◽  
High Switching Frequency ◽  
Output Capacitance

Switching losses of power transistors usually are the most relevant energy losses in high-frequency power converters. Soft-switching techniques allow a reduction of these losses, but even under soft-switching conditions, these losses can be significant, especially at light load and very high switching frequency. In this paper, hysteresis and energy losses are shown during the charge and discharge of the output capacitance (COSS) of commercial high voltage Superjunction MOSFETs. Moreover, a simple methodology to include information about these two phenomena in datasheets using a commercial system is suggested to manufacturers. Simulation models including COSS hysteresis and a figure of merit considering these intrinsic energy losses are also proposed. Simulation and experimental measurements using an LLC resonant converter have been performed to validate the proposed mechanism and the usefulness of the proposed simulation models.

scholarly journals An Extremely High Power Density Asymmetrical Back-to-Back Converter for Aerospace Motor Drive Applications

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1292
Author(s):  
Yifan Zhang ◽  
Chushan Li ◽  
David Xu ◽  
Wuhua Li ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Power Systems ◽  
Power Density ◽  
High Efficiency ◽  
Switching Frequency ◽  
Multilevel Converter ◽  
Voltage Standard ◽  
Voltage Level ◽  
High Switching Frequency ◽  
Higher Power ◽  
Converter Topologies

Higher-voltage-standard and higher-power-rating aerospace power systems are being investigated intensively in the aerospace industry to address challenges in terms of improving emissions, fuel economy, and also cost. Multilevel converter topologies become attractive because of their higher efficiency under high-voltage and high-switching-frequency conditions. In this paper, an asymmetrical-voltage-level back-to-back multilevel converter is proposed, which consists of a five-level (5L) rectifier stage and a three-level (3L) inverter stage. Based on the comparison, such an asymmetrical back-to-back structure can achieve high efficiency and minimize the converter weight on both rectifier and inverter sides. A compact triple-surface-mounted heatsink structure is designed to realize high density and manufacturable thermal management. This topology and structure are evaluated with a full-rating prototype. According to the evaluation, the achieved power density is 2.61 kVA/kg, which is 30% higher than that of traditional solutions. The efficiency at the rated power of the back-to-back system is 95.8%.

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