Reduction of Common Mode Voltage in Asymmetrical Dual Inverter Configuration Using Discontinuous Modulating Signal Based PWM Technique

M. Harsha Vardhan Reddy,T. Bramhananda Reddy,B. Ravindranath Reddy,M. Suryakalavathi 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6

Conventional space vector pulse width modulation based asymmetrical dual inverter configuration produces high common mode voltage (CMV) variations. This CMV causes the flow of common mode current, which adversely affects the motor bearings and electromagnetic interference of nearby electronic systems. In this study, a simple and generalized carrier based pulse width modulation (PWM) technique is proposed for dual inverter configuration. This simple approach generates various continuous and discontinuous modulating signals based PWM algorithms. With the application of the discontinuous modulating signal based PWM algorithm to the asymmetrical dual inverter configuration, the CMV can be reduced with a slightly improved quality of output voltage. The performance of the continuous and discontinuous modulating signals based PWM algorithms is explored through both theoretical and experimental studies. Results show that the discontinuous modulating signal based PWM algorithm efficiently reduces the CMV and switching losses.

The Effect of Body Configuration on the Manual Control Performance

이동우 국민체육진흥공단 한국스포츠정책과학원 2013 International Journal of Applied Sports Sciences Vol.25 No.1

This study was to investigate the relationship between body configuration and manual performance. It was hypothesized that the change of body configuration could have any effect on the human task performance. It has also been proposed that there are three kinds of constraints that determine the optimal pattern of coordination of a given organism; organismic, environmental, and task constraints. In order to study this phenomenon, five healthy subjects were participated in this research. They were asked to tap the keyboard at a constant rate and with a constant force on the forceplate. While doing the tapping task, such variables as the body angles, the ground reaction forces, interval variability, and peak force variability were used to examine the topological relations. The results showed the change of postural configuration had some effects on manual control performance. Subjects tended to adjust their body configuration as the distance of manual workspace was varied and the performances were influenced by the change of body configuration. The performance variable, interval variability and peak force variability, represented the different characteristics with the changes of heights and locations of object.

Reduction of Common Mode Voltage in Asymmetrical Dual Inverter Configuration Using Discontinuous Modulating Signal Based PWM Technique

Reddy, M. Harsha Vardhan,Reddy, T. Bramhananda,Reddy, B. Ravindranath,Suryakalavathi, M. The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.6

Conventional space vector pulse width modulation based asymmetrical dual inverter configuration produces high common mode voltage (CMV) variations. This CMV causes the flow of common mode current, which adversely affects the motor bearings and electromagnetic interference of nearby electronic systems. In this study, a simple and generalized carrier based pulse width modulation (PWM) technique is proposed for dual inverter configuration. This simple approach generates various continuous and discontinuous modulating signals based PWM algorithms. With the application of the discontinuous modulating signal based PWM algorithm to the asymmetrical dual inverter configuration, the CMV can be reduced with a slightly improved quality of output voltage. The performance of the continuous and discontinuous modulating signals based PWM algorithms is explored through both theoretical and experimental studies. Results show that the discontinuous modulating signal based PWM algorithm efficiently reduces the CMV and switching losses.

The Effect of Body Configuration on the Manual Control Performance

( Dong Woo Lee ) 한국스포츠정책과학원(구 한국스포츠개발원) 2013 International Journal of Applied Sports Sciences Vol.25 No.1

This study was to investigate the relationship between body configuration and manual performance. It was hypothesized that the change of body configuration could have any effect on the human task performance. It has also been proposed that there are three kinds of constraints that determine the optimal pattern of coordination of a given organism; organismic, environmental, and task constraints. In order to study this phenomenon, five healthy subjects were participated in this research. They were asked to tap the keyboard at a constant rate and with a constant force on the forceplate. While doing the tapping task, such variables as the body angles, the ground reaction forces, interval variability, and peak force variability were used to examine the topological relations. The results showed the change of postural configuration had some effects on manual control performance. Subjects tended to adjust their body configuration as the distance of manual workspace was varied and the performances were influenced by the change of body configuration. The performance variable, interval variability and peak force variability, represented the different characteristics with the changes of heights and locations of object.

Development of a Handheld Sheet Resistance Meter with the Dual-configuration Four-point Probe Method

Kang, Jeon-Hong,Lee, Sang-Hwa,Yu, Kwang-Min The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.3

A handheld sheet resistance meter that can easily and quickly measure the sheet resistance of indium tin oxide films was developed. The dual-configuration four-point probe method was adopted for this instrument, which measured sheet resistance in the range from $0.26{\Omega}/sq$. to $2.6k{\Omega}/sq$. with 0.3 % ~ 0.5 % uncertainty. The screen of the instrument displayed the sheet resistance when the probe was in contact with the sample surface and the value continued to be displayed during the probe contact. Even after separating the probe from the surface, the value was still displayed on the screen and could be read easily. A feature of the instrument was the use of the dual-configuration technique to reduce edge effects markedly compared with the single-configuration technique and its ease of operation without applying correction factors for sample size and thickness.

Dual-Configuration Four-Point Probe Method에 의한 휴대형 면저항 측정기 개발

강전홍(Jeon-Hong Kang),유광민(Kwang-Min Yu),김완섭(Wan-Seop Kim) 대한전기학회 2010 전기학회논문지 P Vol.59 No.4

Portable sheet resistance-measuring instrument using the dual-configuration Four-Point Probe method is developed for the purpose of precisely measuring the sheet resistance of conducting thin films. While single-configuration Four-Point Probe method has disadvantages of applying sample size, shape and thickness corrections for a probe spacing, the developed instrument has advantages of no such corrections, little edge effects and measuring simply and accurately the sheet resistance between 0.2 Ω/sq and 2 kΩ/sq..

Effect of Multi-layer Membrane Configuration on Filtration Efficiency and Resistance in Treating Water

현길수 한국수처리학회 2019 한국수처리학회지 Vol.27 No.2

The objective of this research is to investigate the effect of membrane configuration on filtration efficiency and resistance in treating a synthetic water containing turbid and humic substance. The experiments of coagulation-flocculation/sedimentation(CF/S) process using jar test with alum as coagulant and membrane configuration (single-layer microfiltration (SLMF) and dual-layer microfiltration (DLMF) membranes) using stirred dead-cell filter were carried out. Influent water qualities were in the range of turbidity <110 ntu and CODMn <40 mg/L, respectively. Based on the results, the increase of alum dosage in CF/S/SLMF system decreased considerably turbid matter, but not organic matter, while the build-up of transmembrane pressure (TMP) gradually raised with increase of alum dose compared to that of alum dosage < 2mg/L. Without CF/S process, direct filtration of SLMF membrane using high turbid water (<100ntu) resulted in a considerable decrease of permeate flux. The TMP and resistance build-up of DLMF membrane was approximate 40% lower than that of SLMF membrane, while the efficiencies of DLMF membrane in reducing turbidity and COD achieved slightly higher than that of SLMF membrane.

Development of a Handheld Sheet Resistance Meter with the Dualconfiguration Four-point Probe Method

Jeon-Hong Kang,Sang-Hwa Lee,Kwang-Min Yu 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3

A handheld sheet resistance meter that can easily and quickly measure the sheet resistance of indium tin oxide films was developed. The dual-configuration four-point probe method was adopted for this instrument, which measured sheet resistance in the range from 0.26 /sq. to 2.6 k/sq. with 0.3 % ~ 0.5 % uncertainty. The screen of the instrument displayed the sheet resistance when the probe was in contact with the sample surface and the value continued to be displayed during the probe contact. Even after separating the probe from the surface, the value was still displayed on the screen and could be read easily. A feature of the instrument was the use of the dual-configuration technique to reduce edge effects markedly compared with the single-configuration technique and its ease of operation without applying correction factors for sample size and thickness.

Development of a Handheld Sheet Resistance Meter with the Dualconfiguration Four-point Probe Method

강전홍,이상화,유광민 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3

A handheld sheet resistance meter that can easily and quickly measure the sheet resistance of indium tin oxide films was developed. The dual-configuration four-point probe method was adopted for this instrument, which measured sheet resistance in the range from 0.26 Ω/sq. to 2.6 kΩ/sq. with 0.3 % ~ 0.5 % uncertainty. The screen of the instrument displayed the sheet resistance when the probe was in contact with the sample surface and the value continued to be displayed during the probe contact. Even after separating the probe from the surface, the value was still displayed on the screen and could be read easily. A feature of the instrument was the use of the dual-configuration technique to reduce edge effects markedly compared with the single-configuration technique and its ease of operation without applying correction factors for sample size and thickness.

An international Comparison Measurement of Silicon Wafer Sheet Resistance using the Four-point Probe Method

Kang, Jeon-Hong,Ying, Gao,Cheng, Yuh-Chuan,Kim, Chang-Soo,Lee, Sang-Hwa,Yu, Kwang-Min The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

With approval from the Asia Pacific Metrology Program Working Group on Materials Metrology (APMP WGMM), an international comparison for sheet resistance standards for silicon wafers was firstly conducted among Korea Research Institute of Standards and Science (KRISS) in Korea, CMS/ITRI in Taiwan, and NIM in China, which are national metrology institutes (NMIs), from August 2011 to January 2012. The sheet resistance values of the standards are $10{\Omega}$, $100{\Omega}$, and $1000{\Omega}$; the measurement was conducted in sequence at KRISS, CMS/ITRI, NIM, and KRISS again using the four-point probe method with single and dual configuration techniques. The reference value for the measurement results of the three NMIs was obtained through averaging the values of the three results for each sheet resistance range. The differences between the reference value and the measured values is within 0.22% for $10{\Omega}$, 0.17% for $100{\Omega}$, and 0.12% for $1000{\Omega}$. Therefore, the international consistency for conducting sheet resistance measurements is confirmed within 0.22% through the APMP WGMM approved comparison.