SPS Using SiC Die

2014 ◽  
Vol 617 ◽  
pp. 72-77 ◽  
Author(s):  
Kazuyuki Kakegawa ◽  
Chun Ming Wen ◽  
Naofumi Uekawa ◽  
Takashi Kojima
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
High Voltage ◽  
Output Voltage ◽  
Low Voltage ◽  
Maximum Output ◽  
Compositional Fluctuation ◽  
Good Strength ◽  
Transparent Alumina ◽  
Semiconducting Behavior

Possibility of a use of SiC as SPS die was examined. Although SiC has good strength even at high temperature, electrical conductivity is too low as the SPS die. Maximum output voltage of typical SPS machine is 10 V. Joule heat of SiC by application of 10 V is too small to increase its temperature. One idea to solve this problem in this study is to apply higher voltage to the SiC die. Using prototype high voltage SPS equipment, the temperature of SiC die was successfully elevated. Another idea is to heat the SiC die in advance. SiC has a semiconducting behavior, so that the electrical conductivity at high temperature becomes sufficient for the ordinary SPS equipment. Using SPS machine which has hot-wall, heaters surrounding the die, the temperature of the SiC die was successfully increased by application of low voltage. This SPS had similar sintering effects as the ordinary ones. Partly transparent alumina was successfully prepared. Initial compositional fluctuation of Pb (Zr,Ti)O3was maintained after it was densified by this SiC-SPS.

scholarly journals Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1112
Author(s):  
Yu-En Wu ◽  
Jyun-Wei Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Leakage Inductance ◽  
Power Switch ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Voltage Stress ◽  
Voltage Doubler

This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

A Case for High Temperature, High Voltage SiC Bipolar Devices

2007 ◽  
Vol 556-557 ◽  
pp. 687-692 ◽  
Author(s):  
Anant K. Agarwal
Keyword(s):  
High Temperature ◽  
High Voltage ◽  
Low Voltage ◽  
Schottky Diodes ◽  
Life Time ◽  
Extreme Environment ◽  
Junction Temperature ◽  
Current Gain ◽  
Pin Diodes ◽  
Bipolar Devices

The last three years have seen a rapid growth of 600 V and 1200 V SiC Schottky diodes primarily in the Power Factor Correction (PFC) circuits. The next logical step is introduction of a SiC MOSFET to not only further improve the power density and efficiency of the PFC circuits but also to enable the entry of all SiC power modules in Pulse Width Modulated (PWM) based power converters such as motor control in 600-1200 V range. The combination of SiC MOSFET and Schottky diodes will offer 60-80% lower losses in most low voltage applications at normal operating temperatures (< 200°C) where no significant improvements in packaging are required. This will cover most commercial applications with the exception of those having to function under extreme environment (>200°C) such as applications in automotive, aerospace and oil/gas exploration. For these high temperature applications, a case can be made for 600 - 2000 V Bipolar Junction Transistors (BJTs) and PiN diodes provided we do our homework on high temperature packaging. A number of interesting device related problems persist in bipolar devices such as forward voltage increase in PiN diodes and current gain degradation in BJTs. For very high voltage (>10 kV) applications such as those found in utilities (Transmission and Distribution), Large Drives and Traction, a case can be made for >10 kV PiN diodes, IGBTs, Thyristors and GTOs. While IGBTs will be restricted to <200°C junction temperature, the PiN diodes, Thyristors and GTOs may be operated at >250°C junction temperature provided that the high temperature, high voltage packaging issues are also addressed. Significant progress has been made in the development of the p-channel IGBTs and GTOs. The main issues seem to be the VF degradation due to stacking fault formation and improvement of minority carrier life-time.

Development of High Voltage High Frequency Resonant Inverter Power Supply for Atmospheric Surface Glow Barrier Discharges

2005 ◽  
Vol 107 ◽  
pp. 81-86 ◽  
Author(s):  
M. Nisoa ◽  
D. Srinoum ◽  
P. Kerdthongmee
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
High Frequency ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Maximum Output ◽  
Resonant Inverter ◽  
Resonant Inductor ◽  
Barrier Discharges

High-voltage high-frequency power supply using voltage-fed load resonant inverter with a series-compensated resonant inductor has been developed for efficient atmospheric surface glow barrier discharges(ASGBD). It produces a controllable frequency and sinusoidal alternating voltage output. The maximum output voltage is about 6 kV peak to peak. Resonant power converter can be tune easily to the resonant frequency of the load. Operating frequency varies according to the load and voltage level typically in the range of 10 kHz and 1 MHz range. The output voltage is controlled by using pulse width modulation technique. The power supply developed in this paper is applied successfully for ozoniser that can produce high concentrate ozone by using ASGBD for agricultural industry applications.

scholarly journals Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

2021 ◽  
Author(s):  
E Pardo ◽  
M Staines ◽  
Zhenan Jiang ◽  
N Glasson
Keyword(s):  
High Temperature ◽  
High Voltage ◽  
High Temperature Superconductor ◽  
Low Voltage ◽  
Ac Loss ◽  
Power Transformers ◽  
Coated Conductor ◽  
Real Power ◽  
Transformer Design ◽  
Loss Modelling

Power transformers using a high temperature superconductor (HTS) ReBCO coated conductor and liquid nitrogen dielectric have many potential advantages over conventional transformers. The ac loss in the windings complicates the cryogenics and reduces the efficiency, and hence it needs to be predicted in its design, usually by numerical calculations. This article presents detailed modelling of superconducting transformers with Roebel cable in the low-voltage (LV) winding and a high-voltage (HV) winding with more than 1000 turns. First, we model a 1 MVA 11 kV/415 V 3-phase transformer. The Roebel cable solenoid forming the LV winding is also analyzed as a stand-alone coil. Agreement between calculations and experiments of the 1 MVA transformer supports the model validity for a larger tentative 40 MVA 110 kV/11 kV 3-phase transformer design. We found that the ac loss in each winding is much lower when it is inserted in the transformer than as a stand-alone coil. The ac loss in the 1 and 40 MVA transformers is dominated by the LV and HV windings, respectively. Finally, the ratio of total loss over rated power of the 40 MVA transformer is reduced below 40% of that of the 1 MVA transformer. In conclusion, the modelling tool in this work can reliably predict the ac loss in real power applications. This is the Accepted Manuscript version of an article accepted for publication in 'Superconductor Science and Technology'. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/0953-2048/28/11/114008.

Design of Micro Power Consumption Synchronous Chopped Wave Power Supply Based on Fixed and Mobile Double Comparative Point

2014 ◽  
Vol 986-987 ◽  
pp. 1794-1798
Author(s):  
Long Teng Wang ◽  
Jun Lin ◽  
Hui Su
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Power Supply ◽  
Output Voltage ◽  
Low Voltage ◽  
Design Method ◽  
Short Circuit ◽  
Maximum Output ◽  
Residual Voltage ◽  
Micro Power

This paper proposes a design method of the micro power consumption synchronous chopped wave and low-power switching power supply based on fixed and mobile double comparative point. The output of this power supply ranges from 5V to 200V. It overcomes the residual voltage effect after the bridge rectifier by using fixed comparative point to limit the maximum output voltage, and stabilizes the voltage by using mobile point to produce the required output voltage. The circuit charges with nonlinear resistors pattern in the low voltage, thus improving the charging efficiency, and it has short circuit protection function, simple structure and low power consumption.

scholarly journals Self-Tuning High-Voltage and High-Frequency Sinusoidal Power Supply for Dielectric Barrier Discharge Plasma Generation

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1137 ◽  
Author(s):  
Neretti ◽  
Ricco
Keyword(s):  
Dielectric Barrier Discharge ◽  
High Voltage ◽  
Power Supply ◽  
Output Voltage ◽  
Barrier Discharge ◽  
Maximum Output Power ◽  
Average Power ◽  
Maximum Output ◽  
Dielectric Barrier ◽  
Self Tuning

In this paper a high-voltage sinusoidal power supply controlled by Arduino DUE micro-controller is described. This generator can feed a dielectric barrier discharge (DBD) load with sinusoidal voltages up to 20 kV peak and frequencies in the range 10–60 kHz, with a maximum output power of 200 W. Output voltage can be produced either in a continuous mode, or with on/off modulation cycles, according to treatment/application requirements. This power source is equipped with on-board diagnostics used to measure the output voltage and the charge delivered to the load. With a sample frequency of 500 kHz, Arduino DUE allows to evaluate both the high voltage and the average power feeding the discharge without the use of an expensive external measurement setup. Lissajous techniques are utilized to calculate discharge average power in a quasi-real-time manner. When a load is connected to high-voltage terminals, a self-tuning procedure is carried out to obtain the best working frequency. This parameter allows to minimize power-electronic component stress and to maximize generator efficiency.

BERYLCO 14/BERYLCO TMP 17510

Alloy Digest ◽  
1999 ◽  
Vol 48 (11) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Shear Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Automotive Industry ◽  
Copper Alloy ◽  
Heat Treating ◽  
Good Strength ◽  
Temperature Performance

Abstract Berylco 14 is a beryllium copper alloy with 0.4% Be. The alloy is an automotive industry favorite similar to Berylco 10 (see Alloy Digest Cu-6, April 1953) but with nickel substituting for cobalt. The alloy has high thermal and electrical conductivity, good strength, and superior high-temperature performance. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on heat treating. Filing Code: CU-642. Producer or source: NGK Metals Corporation.

Development of Switching Power Supply with Precision Continuously Adjustable High Voltage

2012 ◽  
Vol 516-517 ◽  
pp. 1512-1516
Author(s):  
Kai Bin Chu ◽  
Nu Wang ◽  
Shu Yue Chen ◽  
Bao Xiang He
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Maximum Output ◽  
Switching Power Supply ◽  
Constant Frequency ◽  
Switching Power ◽  
Continuous Output ◽  
Frequency Pulse

The techniques for developing a kind of the precision continuously adjustable high-voltage switching power supply are proposed, based on the constant frequency pulse width modulation strategies with SG3525, and the continuous output voltage adjustment effect is achieved through a gain amplifier controlled by MCU. The circuit is of the significant features such as high precision output voltages, continuously adjustable, a wide adjustment range and a low power consumption. The results of the experiments show that the output voltage is adjustable between 1KV and 25KV, and the maximum output voltage error is 1.6%.

Neoteric Hybrid Multilevel Cascade Inverter Based on Low Switch Numbers Along with Low Voltage Stress: Design, Analysis, Verification

2017 ◽  
Vol 8 (1) ◽  
pp. 92
Author(s):  
Rasool Esmailzadeh ◽  
A. Ajami ◽  
M.R. Banaei
Keyword(s):  
Power Systems ◽  
Output Voltage ◽  
High Performance ◽  
High Efficiency ◽  
Low Voltage ◽  
Maximum Output ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Voltage Stress ◽  
Multi Level

Abstract: With the purpose of rein in the high voltage of flexible power systems, renovation and amendment of multi-level structures aimed at acquisition of high quality voltage is certainly required. In this regard, robust topology must be occupied that encompass the maximum output voltage levels along with minimum of switch number, of course, with taking into account of Peak Inverse Voltage (PIV). In this paper, a neoteric high-performance multilevel cascaded inverter is suggested up to the problem of repetitive output levels to be unraveled and also number of output voltage levels to be maximized. It has been constructed by series-connected multilevel inverters blocks and three-level inverter. The simulation results along with experimental results extracted by manufactured prototype have transparently approved high efficiency of proposed inverter as well as its feasibility. Apart from above, new mathematical approach has been presented to calculate and define the DC voltage sources magnitudes in asymmetric converter.

scholarly journals Design of High-Voltage Switch-Mode Power Amplifier Based on Digital-Controlled Hybrid Multilevel Converter

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Yanbin Hou ◽  
Wanrong Sun ◽  
Aifeng Ren ◽  
Shuming Liu
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Prototype System ◽  
Maximum Output ◽  
Multilevel Converter ◽  
Peak Voltage ◽  
Class D Amplifier ◽  
Class D ◽  
Digital Pulse ◽  
Switch Mode

Compared with conventional Class-A, Class-B, and Class-AB amplifiers, Class-D amplifier, also known as switching amplifier, employs pulse width modulation (PWM) technology and solid-state switching devices, capable of achieving much higher efficiency. However, PWM-based switching amplifier is usually designed for low-voltage application, offering a maximum output voltage of several hundred Volts. Therefore, a step-up transformer is indispensably adopted in PWM-based Class-D amplifier to produce high-voltage output. In this paper, a switching amplifier without step-up transformer is developed based on digital pulse step modulation (PSM) and hybrid multilevel converter. Under the control of input signal, cascaded power converters with separate DC sources operate in PSM switch mode to directly generate high-voltage and high-power output. The relevant topological structure, operating principle, and design scheme are introduced. Finally, a prototype system is built, which can provide power up to 1400 Watts and peak voltage up to ±1700 Volts. And the performance, including efficiency, linearity, and distortion, is evaluated by experimental tests.

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