A novel control scheme for voltage multiplier based X-ray power supply


Shahid, Iqbal and Rosli, Besar and C., Venkataseshaiah (2008) A novel control scheme for voltage multiplier based X-ray power supply. In: 2nd International Conference on Electrical Engineering, 25-26 MAR 2008, Lahore, PAKISTAN.

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A dual-mode input voltage modulation (IVM) control scheme for a three-phase ZCS series resonant (SR) inverter fed three-phase voltage multiplier based DC-DC converter for X-ray power generator is proposed. The three-phase ZCS SR inverter is formed by connecting three single-phase ZCS SR inverters in parallel and delaying the gating signals by 120 degrees with respect to each other. It operates at constant frequency & duty ratio. The lower arms of all the three single-phase inverters (i.e. which make three-phase ZCS-SR inverter) are connected to a common holding capacitor CH and the voltage V-H across it, is controlled by a control circuit. At the turn ON of the converter, the control circuit clamp voltage V-H to 0V, causing inverter to see full input voltage and output voltage to rise with maximum speed. As the output voltage reaches 80% of target voltage value, the voltage VH is raised from 0V to (V-H)ref, thereby reducing the effective input voltage to inverter. As a result the rise rate of output voltage slow downs and the over shoot is prevented. Experimental results based on the laboratory scale-down prototype are presented to verify the effectiveness of proposed dual-mode IVM control scheme..

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > T Technology (General)
Q Science > QA Mathematics > QA71-90 Instruments and machines > QA75.5-76.95 Electronic computers. Computer science
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 21 Sep 2011 07:32
Last Modified: 21 Sep 2011 07:32
URII: http://shdl.mmu.edu.my/id/eprint/2872


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