Accurate Transient Calorimetric Measurement of Soft-Switching Losses of 10-kV SiC mosfets and Diodes

2018 ◽  
Vol 33 (6) ◽  
pp. 5240-5250 ◽  
Author(s):  
Daniel Rothmund ◽  
Dominik Bortis ◽  
Johann Walter Kolar
Keyword(s):  
Soft Switching ◽  
Calorimetric Measurement ◽  
Switching Losses

scholarly journals HIGH FREQUENCY BOOST CONVERTER EMPLOYING SOFT SWITCHING AUXILIARY RESONANT CIRCUIT

2013 ◽  
pp. 262-267
Author(s):  
G. NARESH GOUD ◽  
Y. LAKSHMI DEEPA ◽  
G.DILLI BABU ◽  
P. RAJASEKHAR ◽  
N. GANGADHER
Keyword(s):  
Theoretical Analysis ◽  
High Frequency ◽  
Boost Converter ◽  
Soft Switching ◽  
Resonant Circuit ◽  
Switching Converter ◽  
Turn On ◽  
Switching Losses ◽  
Resonant Inductor ◽  
Switching Method

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 97% 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.

scholarly journals A Study of ZVS, ZCS and ZVZCS Techniques in Reducing the Energy Loss and Improving the Soft Switching Range

2020 ◽  
Author(s):  
Ratil H Ashique ◽  
Zainal Salam
Keyword(s):  
Energy Loss ◽  
Loss Factor ◽  
Recent Literature ◽  
Soft Switching ◽  
Low Loss ◽  
Turn On ◽  
Switching Losses ◽  
Extended Range ◽  
Simulation Results ◽  
Switch Voltage

This paper presents a comparative analysis of the ZVZCS soft switching technique with the ZVS and the ZCS counterpart. The generalization of the voltage-current crossover or the energy loss factor obtained from simulation of the prototype converter shows that the ZVZCS significantly reduces the loss and helps to improve the efficiency of the converter as compared to the ZVS or the ZCS. On the other hand, it is also found that the soft switching range of operation of the ZVS and the ZCS are largely affected by the maximum switch voltage and switch current respectively. In contrary, these factors have a negligible effect on the ZVZCS operation which results in an extended range of soft switching operation. Additionally, a detailed LTPICE simulation is performed for selected ZVS, ZCS and ZVSCS topologies from the recent literature and the switching losses in the main switches of the converters are measured. It is observed that the energy losses in the ZVZCS mode are reduced on average by approximately 26 % at turn on and 20 % at the turn off as compared to the ZVS and the ZCS. Besides, the low standard deviation in this mode confirms a stable low loss profile which renders extended soft switching range. An experimental test is also conducted by building the prototype converter to verify the simulation results. It is found that the switching losses are minimum while the converter is operated in the ZVZCS mode. Besides, the efficiency drop remains consistently low as compared to the ZVS and the ZCS in the whole operating range. Resultantly, the simulation and the experimental results are both found to be consistent.

scholarly journals Performances of an Interleaved High Step-Up Converter with Different Soft-Switching Snubbers for PV Energy Conversion Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Sheng-Yu Tseng ◽  
Hung-Yuan Wang ◽  
Chih-Yang Hsu
Keyword(s):  
Energy Conversion ◽  
Power Level ◽  
Soft Switching ◽  
Maximum Power ◽  
Experimental Results ◽  
Output Power Level ◽  
Point Tracking ◽  
Switching Losses ◽  
Power Point ◽  
Observation Method

This paper proposes an interleaved high step-up converter with different soft-switching snubbers for PV energy conversion applications. For the high step-up converter, interleaved and coupled-inductor technologies are used to reduce output ripple current and increase output power level. Simultaneously, two types of snubbers, a single-capacitor snubber and boost type snubber, are introduced separately into the discussed converters for comparing their performances of conversion efficiency and switching losses. For drawing maximum power from the PV arrays, a perturbation-and-observation method realized with the microcontroller is adopted to achieve maximum power point tracking (MPPT) algorithm and power regulating scheme. Finally, two prototypes of the interleaved coupled-inductor boost converter with a single-capacitor snubber and with boost type snubber are implemented, respectively. The experimental results obtained are used to verify and compare the performances and feasibilities of the discussed converters with different snubbers in PV conversion applications. The experimental results show that the proposed system is suitable for PV energy conversion applications when the duty ratios of switches of the converter are less than 0.5.

The Simulation Study of Soft Switching Power Factor Correction Circuit Based on MATLAB

2013 ◽  
Vol 846-847 ◽  
pp. 429-433
Author(s):  
Qing Hui Liu
Keyword(s):  
Circuit Design ◽  
Circuit Simulation ◽  
Soft Switching ◽  
Good Effect ◽  
System Efficiency ◽  
Switching Circuit ◽  
Switching Power ◽  
The Past ◽  
Switching Losses

This paper discusses the soft switching circuit—Boost-ZVT converter, and studies the role of Boost-ZVT converter in the factor correction circuit(PFC). Distinguished from the past Boost converter, the Boost-ZVT converter implements the main switch of the soft turn-off, reducing switching losses and improving the system efficiency. At last, Matlab software is carried out the main circuit simulation. The simulation results show that Boost-ZVT circuit has a good effect in PFC circuit design, and has a wide application in practical circuit design.

Topological Structure of Main Circuit Inverter Based on Soft-Switching Technology and Parameters Adaptive

2013 ◽  
Vol 846-847 ◽  
pp. 732-736
Author(s):  
Jun Yan Zeng ◽  
Guang Di Li ◽  
Xue Liang ◽  
Jiao Wang ◽  
Zhi Da Li
Keyword(s):  
High Frequency ◽  
Topological Structure ◽  
Control Method ◽  
Soft Switching ◽  
Switching Power ◽  
Switching Losses

This paper presents a new topology of main circuit based on soft switching technology of ZVS-PWM. At present, hard switching is applied in most inverters. Because the switching power isnt equal to zero, a great number of losses on the switching are generated when the switching at a high frequency. To solve the fault of hard switching, this paper presents that apply the inverter circuits based on soft switching technology of ZVS-PWM to high frequency APF, which will decrease switching losses and noise greatly. The proposed topology and operation principle of the control method is discussed in detail, finally simulated results verify the effect of research.

Load-Adaptive Soft-Switching Energy Recovery Sustainer for Plasma Display

2012 ◽  
Vol 241-244 ◽  
pp. 632-635
Author(s):  
H. L. Do
Keyword(s):  
Theoretical Analysis ◽  
Energy Recovery ◽  
Soft Switching ◽  
Switching Frequency ◽  
Switching Loss ◽  
Switching Characteristic ◽  
Switching Losses ◽  
Plasma Display ◽  
And Performance ◽  
A Current

In this paper, an energy recovery for plasma display is proposed. The proposed energy recovery sustainer provides soft-switching of main sustain switches and reduces the switching loss. Due to soft-switching characteristic, the switching losses of main switches are significantly reduced. In addition, the conduction losses in both main and auxiliary switches are effectively reduced by varying a current build-up time according to image patterns. Theoretical analysis and performance of the proposed energy recovery sustain driver were verified on an experimental prototype operating at 200 kHz switching frequency.

Research on the High Frequency Realization of High-Power Inverter

2011 ◽  
Vol 383-390 ◽  
pp. 1077-1083
Author(s):  
Run Hua Liu ◽  
Gang Wang
Keyword(s):  
High Power ◽  
High Frequency ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Soft Switching ◽  
Multilevel Inverter ◽  
Switching Frequency ◽  
Switching Losses ◽  
Simulation And Experiment

The paper presents the inverter method which based on cascade multilevel inverter and MOSFET-assisted soft-switching of IGBT and modulation strategy against the double requirement of high-power inverter and high frequency. The method can effectively improve the output voltage, reduce harmonic distortion and switching losses, improve the switching frequency and meet the double requirement of the high-power inverter and high frequency. The method proved to be feasible by simulation and experiment.

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