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柳喆魯 全北大學校 1974 論文集 Vol.16 No.-
본보에서는 단상주파수삼배기에 대하여 그 동작의 개요 및 그 실험결과를 고찰한 것으로 이 방식에서는 타회로방식에 비하여 1)회로구성이 간단한 것으로 삼상에서와 같은 전원변압기가 필요없으며 삼배기용전원이 단상이기 때문에 사용이 편리하고, 2)Gate 제어회로가 간단한 것이 특징이라고 하겠다. 이에 대하여 효율이 70%, 효율이 50% 정도이고, 또 입력전압에 대하여 출력전압은거의 정전압특성이나 부하변화에 대해서는 전압변동율이 큰 것이 결점이다. 그러나 역율을 개선하고, 효율을 향상시키는 것이 금후의 과제라고 생각되며 이 방식은 단상주파삼배기로서 응용이 기대된다.
柳喆魯 全北大學校 1978 論文集 Vol.20 No.-
In AC circuits, the special semiconductor like the SCR is a nearly ideal static power switch. The SCR (Thyristor) is also used for proportional control of power in AC circuits through the medium of phase control. When input signal included higher-harmonics, input and converter efficiency was decreased. The devices reducing hegher-harmonics are very complicated and very expensive. Therefore, this paper represented more simple, low cost hybrid bridge type with 2 SCR's and 2 diodes, and obtained the variable DC output voltage (DC converter) through phase control of input voltage. The control range of the DC converter was limited by load impedance angle. Experimental data of efficiency to load was shown 85-89 percent. The proposed AC-DC converters are also expected to be used for DC motor speed control and to be applied to other devices.
柳喆魯 全北大學校 1975 論文集 Vol.17 No.-
Switching semiconductors like the Thyritor (SCR) have permitted static switches to make significant inroad on mechanical switches. Thyristor switches may be designed to perform any of the funchtion of conventional switches. In addition to straightforward ON-OFF action, Thyristor switches can be used as d-c motor driving switches. In this experiment, Thyristor switch is utilized to the variable-speed drive and the reversible control of d-c motor. The gate signal for the Thyristor switch is obtained from the full wave phase controlled circuit with an uni-junction transistor trigger circuit.