Quasi-resonant triggering and preignition technology in flash-lamp of medical laser
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School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
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Corresponding author:
YE Zhi-sheng, zsye@tju.edu.cn
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Received Date:
2008-01-11
Accepted Date:
2008-02-27
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Abstract
In order to restrict the power dissipation and electromagnetic interference when the flash-lamp-pumped system of solid laser is at the time of burst and preignition, the technology of quasi-resonant triggering and preignition was developed.Based on this technology,a long-pulsed medical Nd:YAG laser was designed to meet the electromagnetic compatibility requirements of national medical electrical equipment.Because parasitic parameters of the pulse transformer can not be eliminated, complicated oscillation should occur in the circuit.Making use of this resonance characteristic of the pulse transformer, the triggering frequency was adjusted the same as the resonant frequency,namely,quasi-resonant state,to ignite flash-lamp.The experiments proved this circuit was reliable and stable.The value of triggering-pulsed peak voltage could descend below 10kV,much lower than the nominal triggering voltage, 16kV.The results show that the circuit completely meets the national electromagnetic compatibility standards on medical electrical equipment.
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References
|
[1]
|
State Food and Drug Administration.YY0505-2005/IEC 60601-2001 Medical Electrical Equipment[S].Beijing:Standards Press of China,2005:61(in Chinese). |
|
[2]
|
HUANG Zh Zh,LI J H.Modern medical laser[M].Nanning:Guangxi Science and Technology Press,1994:25-67(in Chinese). |
|
[3]
|
MA Y W,CHENG Y Q.Laser devices[M].Hangzhou:Zhejiang University Press,1994:176-198(in Chinese). |
|
[4]
|
ZHAO N J,DENG G Q,ZHANG Y L.A new circuit of Ti:sapphire laser power supply[J].Laser Technology,2004,28(6):569-571(in Chinese). |
|
[5]
|
WANG J J,JI H B.Methods for solving EMI in TEA/CO2 pulse laser rangefinder[J].Modern Radar,1999,21(1):94-97(in Chinese). |
|
[6]
|
WANG R H.Pulse transformer design[M].Beijing:Science Press,1996:1-39(in Chinese). |
|
[7]
|
MATICK R E.Transmission line pulse transformers——theory and applications[J].Proceedings of the IEEE,1968,56(1):47-62. |
|
[8]
|
CHENG Ch X.Circuit analysis basis[M].Beijing:National Defense Industry Press,2006:99-159(in Chinese). |
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