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Phase-Shift를 이용한 시분할형 부하병렬 고주파 인버터의 특성해석에 관한 연구
조규판,원재선,김동희,노채균,원규식,심광열 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
A half bridge time sharing type load parallel high frequency resonant inverter to give VVVF function in the inverter used as power source of induction heating at high frequency is presented in this paper. This proposed inverter can reduce distribution of the switching current because of using the current of serial resonant circuit to the input current of the parallel one and this paper also realize the output control of independence irrespective of the switching frequency using Phase-Shift. The analysis of the proposed circuit is generally described by using the normalized parameters. Also, the principle of basic operation and the its characteristics are estimated by the parameters, such as switching frequency, the variation of phase angle(φ) of Phase-Shift. It is certain that the proposed circuit will be used and expanded in the high frequency power supplies like induction heating systems.
조규판,원재선,김동희,노채균,배영호 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1
In this paper, we propose the high frequency resonant inverter of the time sharing type which has the effects that the duty cycle of each elements and the thermal loss can be reduce. The analysis of the proposed circuit is described generally by using the normalized parameters. Also, the principle of basic operation and the characteristics of drive were estimated by the switching frequency and the load parameters. And we got the data for designing by the characteristic values obtained at the estimate of characteristic. At the same time, the example of the design's method was proposed and the waveforms of simulation were compared with theoretical waveforms. It is certain that the proposed circuit will be used and expanded in the high frequency power supplies like induction heating systems.
이은우,조규판,김이국,김동희,이광식 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
This paper describes the protection from line to line fault current caused by the trouble of source the low voltage power line. The decision of interrupting capacity in the low voltage circuit breaker is based on foreign rules, environment and actual condition within a country. Congregation of full capacity rating, selective breaking method and cascade breaking method is based on relevance reference and catalog of a manufacturing company. From above result, we obtain the method of optimum coordination and contrive the convenience of actual experience application according to the importance of electricity installation. The calculation of breaking capacity and the application of breaking method investigate actual condition in the case of design of electricity installation established and enlarged for personal use in Gumi, Chilgok area recently and present the point at issue and countermeasure. In the future, I think that this data contribute not only the preventing of electricity installation accident but also of electricity installation accident.
이민기,정판규 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-
A double parallel manipulator has only two or three links in each parallel mechanism so that we expect larger workspace than that of a Stewart platform. To prove this property, this paper finds the workspace of a double parallel manipulator and compare it with that of a Stewart platform. The workspace of the double parallel manipulator is decoupled by a positional and an orientational parts. The posititional workspace is constructed by the first parallel mechanism while the orientational workspace is generated by the second parallel mechanism. These spaces are obtained from maximum to minimum lengths of linear actuators. We compute an unreachable workspace due to link interferences and limited ranges of passive joints and exclude it from the above workspace. The results show volume of workspace in a cartesian space and angular ranges of end effector in yaw and pitch motions.