Correlation between tetragonality (c/a) and direct current (dc) bias characteristics of BaTiO3-based multi-layer ceramic capacitors (MLCC)

2020 ◽  
Vol 8 (27) ◽  
pp. 9373-9381
Author(s):  
Seok-Hyun Yoon ◽  
Mi-Yang Kim ◽  
Donghun Kim
Keyword(s):  
Direct Current ◽  
Ceramic Capacitors ◽  
Dc Bias

The influence of tetragonality (c/a) of the dielectrics of BaTiO3-based multi-layer ceramic capacitors (MLCC) on the direct current (dc) bias characteristics was investigated.

Robust Class-I BME Ceramic Capacitors for High Temperature Applications

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000251-000258
Author(s):  
Abhijit Gurav ◽  
Xilin Xu ◽  
Jim Magee ◽  
Jeff Franklin ◽  
Travis Ashburn
Keyword(s):  
High Temperature ◽  
Test Data ◽  
Dielectric Material ◽  
Class I ◽  
Severe Reduction ◽  
Ceramic Capacitors ◽  
Temperature Application ◽  
Dc Bias ◽  
Reliability Performance ◽  
Robust Reliability

In capacitors for applications at temperatures of 150°C or above, such as automotive under-the-hood electronics and power electronics, a robust dielectric material is necessary. In traditional X8R ceramic capacitors (EIA specification, ΔC/C within ±15% between −55°C and +150°C compared that at 25°C), the dielectric material is designed for applications up to 150°C. However, at temperatures above 150°C, the X8R capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I C0G dielectric has been developed using Nickel electrodes for high temperature application up to 200°C. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer ceramic capacitors (MLCC) made from this material can be qualified as X9G with robust reliability. This paper will report electrical properties and reliability test data on these Class-I C0G ceramic capacitors at temperatures ≥150°C. In addition, test data from D-E curves and energy density measurements will be reported along with a discussion of possible mechanisms behind the robust reliability of this material.

Class-I and Class-II Ceramic Capacitors for High Temperature Applications

2014 ◽  
Vol 2014 (HITEC) ◽  
pp. 000121-000128
Author(s):  
Abhijit Gurav ◽  
Xilin Xu ◽  
Jim Magee ◽  
Reggie Phillips ◽  
Travis Ashburn
Keyword(s):  
High Temperature ◽  
Class Ii ◽  
Class I ◽  
Hole Drilling ◽  
Severe Reduction ◽  
Ceramic Capacitors ◽  
Temperature Application ◽  
Dc Bias ◽  
Reliability Performance ◽  
Robust Reliability

There is a growing need for ceramic capacitors for applications at temperatures of 150°C or above, such as electronics for down-hole drilling and exploration, geothermal energy generation and power electronics. Conventional X7R and X8R type ceramic capacitors are designed for applications up to 125°C and 150°C, respectively. At temperatures above 150°C, these types of capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I C0G dielectric has been developed using nickel electrodes for high temperature application up to 200°C and beyond. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer Ceramic Capacitors (MLCC) made from this material can be qualified as X9G with robust reliability. We have also developed a modified-X7R dielectric composition with nickel internal electrodes to design robust reliability in this Class-II dielectric at 175°C. This paper will report electrical properties and reliability test data on these Class-I C0G and Class-II ceramic capacitors at high temperatures of 150–200°C and above.

Advances in Ceramic Capacitors for High Temperature Applications

2015 ◽  
Vol 2015 (HiTEN) ◽  
pp. 000134-000141 ◽  
Author(s):  
Abhijit Gurav ◽  
Xilin Xu ◽  
Jim Magee ◽  
Reggie Phillips ◽  
Travis Ashburn
Keyword(s):  
High Temperature ◽  
Class Ii ◽  
Class I ◽  
Hole Drilling ◽  
Severe Reduction ◽  
Ceramic Capacitors ◽  
Temperature Application ◽  
Dc Bias ◽  
Reliability Performance ◽  
Robust Reliability

There is a growing need for capacitors for applications at temperatures of 150°C or above, such as electronics for down-hole drilling and exploration, geothermal energy generation and power electronics. Conventional X7R and X8R type ceramic capacitors are designed for applications up to 125°C and 150°C, respectively. At temperatures above 150°C, these types of capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I C0G dielectric has been developed using Nickel electrodes for high temperature application up to 200°C and beyond. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer ceramic capacitors (MLCC) made from this material can be qualified as X9G with robust reliability. A Class-II modified-X7R dielectric composition with nickel internal electrodes showing robust reliability at 175°C has also recently been developed. This paper will report electrical properties and reliability test data on these Class-I C0G and Class-II ceramic capacitors at high temperatures of 150–200°C and above.

Ceramic Capacitors and Stacks for High Temperature Applications

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000030-000037 ◽  
Author(s):  
Abhijit Gurav ◽  
Xilin Xu ◽  
Jim Magee ◽  
John Bultitude ◽  
Travis Ashburn
Keyword(s):  
High Temperature ◽  
Dielectric Material ◽  
Class I ◽  
Hole Drilling ◽  
Severe Reduction ◽  
Ceramic Capacitors ◽  
Temperature Application ◽  
Dc Bias ◽  
Reliability Performance ◽  
Robust Reliability

There is a growing need for ceramic capacitors for applications at temperatures of 150°C or above, such as electronics for down-hole drilling, geothermal energy generation and power electronics. In traditional X8R ceramic capacitors (EIA specification, TCC or ΔC/C within ±15% between −55°C and +150°C compared that at 25°C), the dielectric material is designed for applications up to 150°C. However, at temperatures above 150°C, the X8R capacitors typically suffer from degradation of reliability performance and severe reduction in capacitance, especially under DC bias conditions. Recently, a Class-I C0G dielectric has been developed using Nickel electrodes for high temperature application up to 200°C and beyond. Due to its linear dielectric nature, this material exhibits highly stable capacitance as a function of temperature and voltage. Multi-layer ceramic capacitors (MLCC) made from this material can be qualified as X9G with robust reliability. This paper will report electrical properties and reliability test data on these Class-I C0G ceramic capacitors at high temperatures at 150–200°C and above along with a discussion of possible mechanisms behind the robust reliability of this high temperature dielectric.

Direct-Current and Alternate-Decay-Current Hybrid Integrative Power Supplies Design Applied to DC Bias Treatment

2018 ◽  
Vol 33 (12) ◽  
pp. 10251-10264 ◽  
Author(s):  
Zhiwei Chen ◽  
Baodong Bai ◽  
Dezhi Chen ◽  
Wenping Chai
Keyword(s):  
Direct Current ◽  
Power Supplies ◽  
Dc Bias

The influence of direct current bias on the initial aging of a doped lead magnesium niobate ceramic

1998 ◽  
Vol 13 (3) ◽  
pp. 675-679 ◽  
Author(s):  
Y. Wang ◽  
Y. C. Chan ◽  
Z. L. Gui ◽  
L. T. Li
Keyword(s):  
Dielectric Constant ◽  
Direct Current ◽  
Loss Tangent ◽  
Lead Magnesium Niobate ◽  
Dielectric Parameters ◽  
Magnesium Niobate ◽  
Dielectric Constant And Loss ◽  
Wide Range ◽  
Lead Magnesium ◽  
Dc Bias

The initial dielectric aging behaviors of a Mg and Mn doped lead magnesium niobate ceramic were investigated over a wide range of direct current (dc) bias. Both the dielectric constant-log(time) and the loss tangent-log(time) were regressed in terms of a linear relationship. The dc bias is found to have a strong influence on the dielectric parameters at the start of aging and to suppress the aging of dielectric constant and loss tangent. The frequency dependence of the dielectric aging is also evidently affected by the dc bias.

scholarly journals Design Requirement and DC Bias Analysis on HVDC Converter Transformer

2021 ◽  
Vol 257 ◽  
pp. 01038
Author(s):  
Weijian Peng ◽  
Qi Liu ◽  
Li Liang ◽  
Wenqi Jiang ◽  
Zhuoyuan Zhang
Keyword(s):  
Direct Current ◽  
Critical Role ◽  
Bias Current ◽  
Design Requirement ◽  
Current Effect ◽  
Paper Briefly ◽  
Bias Analysis ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Dc Bias

The converter transformer plays a critical role in the high-voltage direct current (HVDC) transmission system, which connects but separates the AC grids and the converter. This paper briefly introduced the essential design requirement of the HVDC converter transformer in a system at ±800kV level and analyzed the DC bias influence on the transformer. The DC bias current effect simulations are analyzed in MATLAB and ANSYS Maxwell in this paper, respectively.

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