• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.3
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• pp.365-373
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• 2015

The performance of 4-switch 3-phase inverter(FSTPI) is mainly affected by the unbalanced voltages between two capacitors which replace two switches of conventional 6-switch 3-phase inverter(SSTPI). This paper proposes a DC offset current injection method to compensate the capacitor voltage unbalance for FSTPI. A simplified SVPWM method which can be applied to FSTPI is also proposed. The validity of the proposed methods is verified by computer simulation.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.3
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• pp.283-292
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• 2016

The performance of 4-switch 3-phase inverter(: FSTPI) which replace two switches of 6-switch 3-phase inverter(: SSTPI) is mainly affected by the compensator unbalanced voltages and output voltage control method. This paper proposes a DC offset current injection method to compensate the capacitor unbalanced voltages for FSTPI. A simplified SVPWM method which can be applied to FSTPI is also proposed. The validity of the proposed methods is verified by simulation and experiment using SPMSM.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.4
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• pp.339-346
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• 2005

It is complex to realize the reference voltage vector by the space vector PWM method in three-leg two-phase inverter In this paper a new PWM technique for three-leg two-phase inverter fed two-phase induction motor is poroposed assuming that three-leg two-phase inverter is equivalent circuit for 'four-leg two-phase inverter with the connected two windings'. From assumption, six sectors are decreased to four sectors, and simple sinusoidal PWM method instead of SVPWM is applied to three-leg two-phase inverter. Also, the switching pattern to determine the switching periods at each sector is proposed. Practical verification of theoretical predictions is presented to confirm the capabilities of the new techniques.

• Proceedings of the KIPE Conference
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• 2017.11a
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• pp.127-128
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• 2017

본 논문에서는 에너지 저장 장치용 3상 4선식 계통 연계 양방향 인버터의 구성 방법에 따른 특성을 비교 분석 한다. 3상-4선식 인버터의 N상을 DC 링크 중성점 결선, 추가적인 전력 반도체 스위치를 이용하여 결선하는 방법, 그리고 변압기를 이용한 결선 방법에 따른 특성을 비교 및 분석을 한다.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.113-115
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• 2006

일반적으로 3상 BLDC 전동기 구동을 하기 위해서는 6-스위치 인버터와 회전속도를 제어하기 위해서는 회전속도와 회전자 위치에 대한 정보를 필요로 한다. 본 논문에서는 3상 BLDC 전동기 구동을 위한 방법으로서 4-스위치 인버터와 회전자 위치를 간접적으로 검출하는 센서리스 구동방식을 제안하였다. 또한 4-스위치 구동에 대한 문제점을 개선하기 위하여 Voltage Doubler를 이용함으로써 기존 방법에 비해 전체 구동 시스템의 비용과 크기를 줄이는 효과를 얻을 수 있고 BLDC 전동기 성능을 향상시킬 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.5
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• pp.139-144
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• 2023

In order to obtain the maximum characteristics of motors such as torque and efficiency, all motors basically use universal inverters designed for each motor's characteristics. However, if you look at the recent research results, you can see cases of SRM(Switched Reluctance Motor) driving studies using 6-switch inverters, which are BLDC(Brushless DC Motor) universal inverters, and research cases of driving 3-phase BLDC motors using 4-switch inverters. Therefore, it is possible to search for research methods by approaching various methods of driving and control that can drive each motor apart from the existing universal inverter. In line with this research trend, in this paper, a C-dump type converter, which is an SRM drive converter, was applied as a drive driver for a BLDC motor, and its characteristics and possibilities were studied.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.116-118
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• 2006

일반적으로 3상 BLBC 전동기 구동을 하기 위해서는 6-스위치 인버터와 회전속도를 제어하기 위해서는 회전속도와 회전자 위치에 대한 정보를 필요로 한다. 본 논문에서는 3상 BLDC 전동기 구동을 위한 방법으로서 4-스위치 인버터와 회전자 위치를 간접적으로 검출하는 센서리스 구동방식을 제안하였다. PM BLBC 전동기의 고정자전압 특성중 하나인 3고조파 전압 성분을 이용하여 기존의 위치 검출 센서인 Hall-ICs의 신호를 생성하여 회전자의 위치를 판별함과 동시에 속도 센서를 대신하여 사용할 수 있는 방법을 제안하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.6
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• pp.523-529
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• 2000

• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.187-192
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• 2018

This thesis is about the study of inverter terminal boxes in a explosion proof type exhaust fan that can control wind volume and operating time. In Korea, there is no ventilator to adjust the amount of wind and operating time when working in poor conditions. The purpose of the project is to create a explosion terminal box that can control the operating time and wind speed of a suitable explosion ventilator in hazardous environments. The two explosion-proof switches allow the operation time to be driven 1 hour, 3 hours and continuous time, and the speed of the induction motor rotation was set in 3 stages at 2000 rpm, 2600 rpm and 3000 rpm to control the volume. The tested motor used a half-horsepower barrier three-phase induction motor and a full-bridge inverter to set the desired flow rate and operating time.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.4
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• pp.359-365
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• 2002

Three-phase four-wire electrical distribution systems have been widely employed in manufacturing plants, commercial and residential buildings. Due to the nonlinear loads, the neutral conductor carries excessive harmonic currents resulting in wiring failure of the neutral conductor, overloading of the distribution transformer and a voltage drop between the neutral and the ground. This paper proposes a reduced rating active power filter to suppress neutral current harmonics in three-phase four-wire electrical distribution systems. The proposed system is simple in control and the VA rating of the inverter could be significantly reduced since only the fundamental current due to unbalanced loading flows through the inverter switch. The experimental results on a prototype validate the proposed control approach.