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- 저자 : 임홍우(Hong-Woo Llm) (검색결과 1 건)
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이성길(Seong-Gil Lee),임홍우(Hong-Woo Llm),조금배(Geum-Bae Cho),정수복(Soo-Bok Chung),백형래(Hyung-Lae Baek) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In order to radiate X -ray, the low ripple stabilized high voltage DC over the range of 40KV to 150KV is directly inflicted to X -ray tube. The energy characteristics of the radiated X -ray depend on the pulsating waveforms of the DC voltage supplied X -ray tube In general, the low ripple voltage waveforms with fast rising times are required to increase with the dosage per unit I1me lest the exposure I1me should be longer in orde that the motion artifacts of an object may be eliminated in actual The conventional types of X -ray generators were bulky in physical size and heavy in weight, and the control accuracies of the output voltages were not always satisfactory. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing new power semiconductor devices. To decreasing the volume and the weight of high voltage transformer, and to stabilize ripple, a high frequency PWM inverter is connected between DC source and high voltage transformer. This paper describes the output characteristics according to stabilize ripple of X -ray tube voltage and compared the reproducibility, direcibility and doesage.
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