Evaluation of SiC Stack Cascode for 200°C Operations

2014 ◽  
Vol 778-780 ◽  
pp. 879-882 ◽  
Author(s):  
Xue Qing Li ◽  
Petre Alexandrov ◽  
John Hostetler ◽  
Anup Bhalla
Keyword(s):  
Dynamic Characteristics ◽  
Threshold Voltage ◽  
Load Condition ◽  
Experimental Results ◽  
Reliability Test ◽  
Inductive Load ◽  
Static And Dynamic Characteristics

This paper evaluates the static and dynamic characteristics of a 1.2kV SiC stack-cascode at junction temperatures (Tj) up to 200°C. The experimental results show that, at Tj = 200°C, the SiC stack-cascode can be switched stably under a 600V-17A inductive load condition and can withstand an avalanche current of 13A for 9μs (Eav = 116mJ) for a 1.5mH load inductor. The SiC stack-cascode has no degradation in on-resistance, threshold voltage and blocking characteristics after 80 hours HTRB reliability test at 200°C ambient. These promising experimental results indicate the possibility of the SiC stack-cascode for reliable 200°C operations.

Damping Performance of Polychloroprene Rubber for Unconstrained Damping Applications

2021 ◽  
Vol 106 ◽  
pp. 131-136
Author(s):  
Prasanth Kumar Mallipudi ◽  
Padala Jyothi ◽  
N. Ramanaiah ◽  
V.V.S. Bhaskara Raju
Keyword(s):  
Vibration Control ◽  
Layer Thickness ◽  
Dynamic Characteristics ◽  
Loss Factor ◽  
Structural Response ◽  
Experimental Results ◽  
Viscoelastic Layer ◽  
Damping Properties ◽  
Structural Damping ◽  
Static And Dynamic Characteristics

Damping properties are crucial in determining the dynamic structural response. In this paper, the experimental results for Neoprene rubber of 40, 50 and 60 shore A hardness are reported in view of improving structural damping to control noise and vibrations. Additionally, the system loss factors of the unconstrained layer damped structures of same material were predicted by Ross-Kerwin-Ungar equation to validate the obtained experimental results. The results showed that Neoprene rubber (also known as Polychloroprene) of 60 shore A showed better static and dynamic characteristics than those of the 40 and 50 shore A hardness. The system loss factor results reached the saturation when the applied viscoelastic layer thickness was increased from 40 mm to 50 mm in unconstrained damping. As such, the proposed method can help to build a database of the properties of various materials which are applicable in the design of noise and vibration control.

Static and Dynamic Characteristics of SiC MOSFETs and SBDs for 3.3 kV 400 A Full SiC Modules

2015 ◽  
Vol 821-823 ◽  
pp. 592-595 ◽  
Author(s):  
Keiji Wada ◽  
Hideto Tamaso ◽  
Satomi Itoh ◽  
Kenji Kanbara ◽  
Toru Hiyoshi ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Dynamic Characteristics ◽  
Static Characteristics ◽  
Drain Voltage ◽  
Inductive Load ◽  
Static And Dynamic Characteristics ◽  
Edge Termination ◽  
Turn On ◽  
Igbt Modules

Characteristics of SiC MOSFETs and SBDs with 3.3 kV-class have been presented. Static Characteristics of the MOSFET showed a specific on-resistance of 14.2 mΩ cm2. A breakdown voltage of 3850 V is obtained by using the dose optimized edge termination structure as we have previously reported [1]. At the same time, reverse leakage current of the 3.3 kV SiC SBDs can be suppressed by the JBS structure and the edge termination which is also used in the MOSFETs. By using the MOSFETs and SBDs, we have demonstrated the superior capability of the 3.3 kV 400 A full SiC 2 in 1 modules with a compatible case and terminal configurations to Si IGBT modules. Dynamic characteristics of the full SiC module in an inductive load switching exhibits superior turn-on and turn-off properties even at a high drain voltage of 1650 V, demonstrating the availability of high voltage SiC power systems.

Pneumatic Bellows Actuator with Force Sensing Ability and Its Application to a Pneumatic Robot

1995 ◽  
Vol 7 (6) ◽  
pp. 474-482 ◽  
Author(s):  
Yasuhiro Hayakawa ◽  
◽  
Sadao Kawamura ◽  
Keyword(s):  
Dynamic Characteristics ◽  
Pressure Sensors ◽  
Force Sensor ◽  
Experimental Results ◽  
Pneumatic Actuator ◽  
Force Sensing ◽  
Friction Forces ◽  
Static And Dynamic Characteristics ◽  
Metal Bellows ◽  
External Forces

In this paper, we design a new pneumatic actuator using metal bellows. Because this actuator has no sliding parts, there is no influence of friction forces. Therefore, it is expected that the actuator has good performance in positioning and generating exact desired forces. Furthermore, because external forces can be precisely measured through pressure sensors, the bellows actuator works as a force sensor. In order to use the bellows actuator as a force sensor (bellows sensor), we investigate the static and dynamic characteristics of the bellows actuator. Based on these experimental results, the capability of the bellows sensor becomes clear. We use the bellows actuator as a sensing actuator which works as a sensor and an actuator simultaneously. In addition, the effectiveness of the actuator is demonstrated through several experimental results. We design one joint of a robot which is antagonistically activated by the two bellows actuators. Based on some experimental results, we disclose the static and dynamic characteristics of the proposed robot and confirm that it can move flexibly following external forces by utilizing the force sensing ability.

Optimal Design of the Needle Bed Slot Milling Machine Based on ANSYS

2012 ◽  
Vol 532-533 ◽  
pp. 183-186
Author(s):  
Wen Jun Qi ◽  
Zhao Kun Xu
Keyword(s):  
Optimal Design ◽  
Wall Thickness ◽  
Dynamic Characteristics ◽  
Load Condition ◽  
Original Model ◽  
Milling Machine ◽  
Static And Dynamic Characteristics ◽  
Slot Milling ◽  
First Order ◽  
Optimized Model

The first order optimization of the ANSYS design module is used for optimizing the stucture parameters of wall thickness and the ribs. And a comparison of static and dynamic modes is made between the original model and the optimized one under the same load condition. The results show that total volume of the optimized model is significantly reduced compared with the original one with little change in aspect of static and dynamic characteristics.

Static and Dynamic Characteristics of Oil Lubricated Beveled-Step Herringbone-Grooved Journal Bearings

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
M. M. Nemat-Alla ◽  
A. M. Gad ◽  
A. A. Khalil ◽  
A. M. Nasr
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Hydrodynamic Lubrication ◽  
Journal Bearings ◽  
Friction Torque ◽  
Experimental Results ◽  
Static And Dynamic Characteristics ◽  
Thrust Bearings ◽  
Rectangular Profile ◽  
The Stability

Recently, herringbone-grooved journal bearings (HGJBs) have important applications in high-speed rotating machinery. The groove action in pumping the lubricating fluid inward generates supporting stiffness and improves the stability of the bearing when operating concentrically. Several researchers have investigated the static and dynamic characteristics of HGJBs and grooved thrust bearings. Most of these investigations were theoretical and concentrated on HGJBs with rectangular-profile grooves. In the present work, the static and dynamic characteristics of the beveled-step HGJBs are experimentally investigated. The bearing attitude angle, pressure distribution, and bearing friction torque were measured on a hydrodynamic lubrication unit, and then the static and dynamic characteristics were determined. The obtained experimental results are compared to the obtained experimental results for plain journal bearing. The merits as well as the demerits of the groove profile were discussed through comparisons with plain journal bearings.

Impact of Stripe Trench-Gate Structure for 4H-SiC Trench MOSFET with Bottom Oxide Protection Layer

2018 ◽  
Vol 924 ◽  
pp. 761-764
Author(s):  
Yutaka Fukui ◽  
Katsutoshi Sugawara ◽  
Kohei Adachi ◽  
Hideyuki Hatta ◽  
Kazuya Konishi ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Threshold Voltage ◽  
Lattice Structure ◽  
Depletion Layer ◽  
Switching Loss ◽  
Static And Dynamic Characteristics ◽  
Gate Structure ◽  
Stripe Structure ◽  
Protection Layer ◽  
The Difference

An optimized layout for a trench-gate SiC-MOSFET with a self-aligned Bottom P-Well (BPW) was investigated for reduction of the specific on-resistance and switching loss. The static and dynamic characteristics of trench-gate MOSFETs with lattice and stripe in-plane structures were evaluated by varying the distance between neighboring BPWs (dBPWs). For the stripe structure, more significant improvements on the specific on-resistance (Ron,sp), gate-source threshold voltage (Vth) were achieved compared with the lattice structure, which was found to be due to the difference in the spread of the depletion layer and the channel planes in the device.

Invited PaperTemperature dependence of SiGe HBT static and dynamic characteristics

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-81-Pr3-86
Author(s):  
F. Aniel ◽  
N. Zerounian ◽  
A. Gruhle ◽  
C. Mähner ◽  
G. Vernet ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics ◽  
Sige Hbt

scholarly journals Microcontroller Based Flexible Modulation Scheme of MLI Operation for Selective Lower Levels: A Knowledge Based Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
R. K. Dhatrak ◽  
R. K. Nema ◽  
D. M. Deshpande
Keyword(s):  
Pulse Generation ◽  
Multilevel Inverter ◽  
Experimental Results ◽  
Modulation Scheme ◽  
Inductive Load ◽  
Medium Voltage ◽  
Knowledge Based ◽  
Common Mode Voltage ◽  
Power Modules ◽  
And Performance

In today’s industrial world multilevel inverter (MLI) got a significant importance in medium voltage application and also a very potential topic for researchers. It is experienced that studying and comparing results of multilevel inverter (MLI) at distinct levels are a costlier and time consuming issue for any researcher if he fabricate different inverters for each level, as designing power modules simultaneously for different level is a cumbersome task. In this paper a flexible quotient has been proposed to recognize possible conversion of available MLI to few lower level inverters by appropriately changing microcontroller programming. This is an attempt to obtain such change in levels through simulation using MATLAB Simulink on inductive load which may also be applied to induction motor. Experimental results of pulse generation using dsPIC33EP256MC202 demonstrate the feasibility of proposed scheme. Proposed flexible quotient successfully demonstrates that a five-level inverter may be operated as three and two levels also. The paper focuses on odd levels only as common mode voltage (CMV) can be reduced to zero and performance of drives is better than even level. Simulated and experimental results are given in paper.

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