DocumentCode :
1281483
Title :
Series and parallel transformer resonant DC-DC converter using optimal digital servo and repetitive learning control schemes
Author :
Sun, J. ; Takano, H. ; Nakaoka, M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Yamaguchi Univ., Japan
Volume :
146
Issue :
5
fYear :
1999
fDate :
9/1/1999 12:00:00 AM
Firstpage :
530
Lastpage :
538
Abstract :
A digitally processed repetitive learning control approach is presented in combination with a type-1 optimal digital servo control scheme of the resonant DC-DC converter using IGBT modules for a medical X-ray power generator. This scheme is considered for achieving a rapid transient response without any overshoot in addition to high-voltage characteristics with low ripple in its steady-state within a wide setting range of output voltage. To improve nonlinear voltage regulation performance of the series capacitor compensated transformer parallel resonant inverter-type fixed frequency, phase-shifted PWM DC-DC converter with a high-voltage transformer link, the repetitive learning control method is introduced into medical X-ray power generator systems using a series and parallel resonant DC-DC converter with high voltage transformer matching. This makes use of transformer parasitic parallel resonance with a series-compensated resonant capacitor connected to a transformer parasitic leakage inductor. The effectiveness of the repetitive learning control for this converter is discussed. A digital servo control scheme with error compensation loops is implemented to eliminate periodic voltage ripple fluctuations and abrupt voltage changes in the rectified DC input of this converter. This scheme also aims to realise good reproducibility, which is an important requirement in an X-ray power generator. The practical effectiveness of the repetitive learning control method and the type-1 optimal digital servo control scheme are confirmed by simulation analysis and experiments
Keywords :
DC-DC power convertors; PWM power convertors; X-ray production; biomedical equipment; control system analysis; control system synthesis; insulated gate bipolar transistors; learning (artificial intelligence); optimal control; power bipolar transistors; power transformers; resonant power convertors; servomechanisms; transient response; IGBT modules; control design; control performance; control simulation; error compensation loops; high voltage transformer matching; high-voltage transformer link; medical X-ray power generator; nonlinear voltage regulation performance; optimal digital servo control scheme; periodic voltage ripple fluctuations elimination; repetitive learning control scheme; series-parallel transformer resonant DC-DC power converter; transformer parasitic parallel resonance; transient response;
fLanguage :
English
Journal_Title :
Electric Power Applications, IEE Proceedings -
Publisher :
iet
ISSN :
1350-2352
Type :
jour
DOI :
10.1049/ip-epa:19990157
Filename :
810255
Link To Document :
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