SRM을 이용한 자동차용 Radiator 냉각팬 구동시스템

윤용호(Yong-Ho Yoon),김재문(Jae-Moon Kim),박상훈(Sang-Hoon Park),원충연(Chung-Yuen Won) 대한전기학회 2009 전기학회논문지 P Vol.58 No.3

In automobile, the introduction of electronically commutated motors has been accompanied by a proliferation of electronic devices. With this proliferation of electronic devices, an emphasis has been placed on EMC issues. This paper is proposed to use SRM as a radiator cooling fan in automotive applications. To drive SRM, Energy efficient C-dump converter is applied. Energy efficient C-dump converter, derived from the conventional C-dump converter, is proposed as a switched reluctance motor (SRM) drive for automotive engine cooling application. It is verified more efficient than other converters through simulation and experiments. And also SRM is valid for automotive applications that have strict EMC standards. Simulation and experimental results obtained on a laboratory prototype are finally presented to evaluate the performance.

신재생에너지용 태양광 PCS 국내 기술기준 및 성능시험

윤용호(Yong-Ho Yoon) 대한전기학회 2018 전기학회논문지 Vol.67 No.3

This paper describes domestic technical standard of Photovoltaic(PV) PCS(Power Conditioning Systems)- Characteristics of the utility interface. This standard tests utility compatibility and personnel safety and equipment protection of PV inverter performance functions. Especially utility compatibility part includes test items of 1)voltage, current and frequency, 2)normal voltage operating range, 3)DC injection, 4)normal frequency operating range, 5)harmonics and 6)waveform distortion, 7)power factor of PV inverter. Therefore in this paper each test item of domestic technical standard is studied and analyzed and finally full tested by PV inverter performance function.

스위치드 릴럭턴스 모터의 센서리스제어를 위한 전압펄스주입 알고리즘

윤용호(Yong-Ho Yoon),정균하(Kyun-Ha Jung),이태원(Tae-Won Lee),원충연(Chung-Yuen Won),김지원(Ji-Won Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-

We propose an improved sensorless drive method of Switched Reluctance Motors using impressed voltage pulses. Conventional impressed voltage pulse method has a problem of phase delay because of low -pass filter. So in this paper we propose an improved sensorless driving method based on the impressed voltage pulse using new phase-shift circuit technique that overcomes the phase delay and start-up problem.

분산전력 제어를 위한 가정용 연료전지 시스템 설계

윤용호(Yong-Ho Yoon) 대한전기학회 2021 전기학회논문지 Vol.70 No.10

Energy used at home accounts for about 20% of the total energy used in the country, so efficient use of electricity used at home is very important for national energy conservation and reduction of pollution factors. Therefore, among the distributed fuel cells, the household fuel cell (RPG: Residential Power Generator) that is receiving the most attention is expected to be able to solve heating and cooling in the house and use electricity in 10 years without external help. In general, electric energy production always accompanies the production of heat, but the transport of heat for heating is very difficult. In the case of conventional power generation, electricity is generated from large-scale power generation and hot water is received from a boiler at home, whereas the fuel cell system has the advantage of being able to use heat because it produces electricity and heat directly at home. Therefore, the home is the best place to produce and consume heat and electricity at the same time. It is the most ideal place to use the supplied city gas to produce and use heat and electricity using a locally installed small fuel cell power generation system with low exhaust gas and no noise. It could be a household energy system. In this paper, the operation characteristics of a home fuel cell system for distributed power control are verified by designing and manufacturing a fuel cell simulator, a DC/DC step-up converter, and an inverter suitable for a home cogeneration system.

한상의 단자전압을 이용한 BLDC 전동기 센서리스 알고리즘

윤용호(Yong-Ho Yoon),원충연(Chung-Yuen Won) 대한전기학회 2010 전기학회논문지 P Vol.59 No.2

This paper presents a sensorless speed control of BLDC Motor using terminal voltage of the one phase. Rotor position information is extracted by indirectly sensing the back EMF from only one of the three terminal voltages for a three-phase BLDC motor. Depending on the terminal voltage sensing rotor position, active filter is used for position information. This leads to a significant reduction in the component device of the sensorless circuit. Therefore this is a advantage for the cost saving and size reduction. With indirect sensing methods based on detection of the terminal voltage that require active filtering, the position information needs the six divider section by PLL circuit, the binary counter and johnson counter by the EPLD. Finally, this algorithm can estimate the rotor position information similar to Hall-sensor sticked the three-phase BLDC motor. As a result, the method described that it is not sensitive to filtering delays, allowing the motor to achieve a good performance over a wide speed range. In addition, a simple starting method and a speed estimation approach are also proposed. Experimental and simulation results are included to verify the proposed scheme.

의미 기반 정적 분석과 규칙 명세 언어를 활용한 C/C++ 프로그램 보안 취약점 검출

윤용호(Yongho Yoon),진민식(Minsik Jin),정영범(Yungbum Jung),이규호(Gyuho Lee),김희동(Heedong Kim),김진국(Jingoog Kim) 한국정보과학회 2019 정보과학회 컴퓨팅의 실제 논문지 Vol.25 No.10

보안 취약점을 정적 분석으로 검출하는 것에는 여러 장점이 있지만 일반적으로 새로운 취약점 검출을 지원하기 위한 비용이 크다는 어려움이 있다. 검출 범위를 손쉽게 확장하기 위해 보안 취약점을 표현할 수 있는 방법을 정의하고 그 표현에 부합하는 프로그램을 검출하는 기술이 존재하지만 대개 프로그램의 모양에만 의존하거나 간단한 값 흐름 분석에만 적용할 수 있었다. 이런 점을 보완하기 위하여 보안 약점을 표현할 수 있는 규칙 명세 언어를 정의하고 이를 기반으로 취약점을 검출하는 요약 해석 기반 정적 분석 도구를 고안 및 구현하였다. 분석 대상 언어는 C/C++이며, 상용 정적 분석 도구에 포함된 C/C++ 분석 엔진을 기반으로 규칙 명세 언어 매칭 검사기를 구현했다. 대상 취약점은 CWE(Common Weakness Enumeration) 목록 중 적합한 17가지를 선별했다. 정오탐률 계산을 위해 자동생성한 테스트 셋을 대상으로 성능을 시험한 결과 정탐률은 61.4%, 오탐률은 7.5%로 집계되었다. In spite of a number of advantages to detecting security holes using static semantic analysis, new types of vulnerabilities are not easily detected by the existing static analyzers. Some technologies have defined mechanisms to identify security vulnerabilities and match them with the programs but they are based only on simple syntactic analysis or data-flow analysis. We defined rule description language (RDL) to describe vulnerability rules and made a static analyzer based on abstract interpretation that detects the denoted defects in C/C++ programs. Implementation of the RDL matching engine was based on an existing commercial C/C++ static analysis tool. We selected 17 rules from the CWE (Common Weakness Enumeration) list that fit with RDL and static analysis. We evaluated the correctness of our tool with automatically generated test cases and the result showed 61.4% true positive and 7.5% false negative rates.

태양광발전설비의 낙뢰검출 보호시스템 설계 및 실증

윤용호(Yong-Ho Yoon),정준호(Jun-Ho Jeong),소윤섭(Yoon-Sub So) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.10

태양광 발전량 증대를 위한 에너지 하베스팅 연구

윤용호(Yong-Ho Yoon) 대한전기학회 2021 전기학회논문지 Vol.70 No.12

In energy harvesting technology, the United States and Europe are leading the technology development, but since the technology is in the stage of introduction around the world, it is a national investment to secure excellent harvesting-related technology through concentration of capabilities of domestic companies and to preoccupy the global market. The power level that can be used through energy harvesting technology is limited to low power of several watts or less, but in terms of energy cost that can be provided per unit time and unit area provided by energy harvested over a long period of several years or more even compared to the batteries currently in use, it can have a significant alternative meaning. Therefore, in this paper, a voltage coupling method near the lowest voltage of inverter operation was developed and converted as a study to increase the amount of solar power generation in the low sunlight section at sunrise and sunset through voltage tightening amplification adjustment and energy storage technology. In addition, through the solar module voltage series/parallel variable connection conversion technology, the power generation time is extended even under the lowest inverter operating voltage to increase the amount of power generation.

역률개선과 고효율을 위한 스위치드 릴럭터스 전동기의 구동 시스템

윤용호(Yong-Ho Yoon),이태원(Tae-Won Lee),송상훈(Sang-Hoon Song),김연충(Yuen-Chung Kim),원충연(Chung-Yuen Won) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-

Switched Reluctance Motor (SRM) offers the advantages of simple and robust motor construction, high speeds and high efficiencies over a wide operating range of torque and speed, excellent controllability. However, SRM has the disadvantages of high current harmonics, and low power factor because of a capacitor filter is inserted in the power converter and inductance of SRM is high, it has pulse waveform of current. This paper deals with an energy efficient converter fed SRM system with the reduced harmonics and improved power factor and with higher efficiency. The validity of the proposed scheme is verified via experiment. We are implemented the proposed control system using 80C196KC micro-controller.

전동차 출입문 구동을 위한 SRM용 C-dump 컨버터 Topology 특성 비교

윤용호(Yong-Ho Yoon) 대한전기학회 2016 전기학회논문지 Vol.65 No.9

The speed at which the SRM (Switched Reluctance Motor) makes a transition from chopping control to single pulse operation. (i.e., low speed to high speed operation). It is unsatisfied with performance at all operational regimes. In this paper, the operational performance of SRM can be improved by using current hysteresis control method. This method maintains a generally flat current waveform. At the high speed, the current chopping capability is lost due to the development of the back-EMF. Therefore SRM operates in single pulse mode. By using zero-current switching and zero-voltage switching technique, the stress of power switches can be reduce in chopping mode. When the commutation from one phase winding to another phase winding, the current can be zero as fast as possible in this period because several times negative voltage of DC-source voltage produce in phase winding. This paper is compared to performance based on energy efficient C-dump converter topology and the proposed resonant C-dump converter topology. Simulation and experimental results are presented to verify the effectiveness of the proposed circuit.