DEPARTMENT OF ELECTRICAL ENGINEERING
INDIAN INSTITUTE OF TECHNOLOGY
PhD Seminar Talk – 1
Title: Modeling, Analysis and Implementation of High Voltage Low Power Flyback Converter Feeding Resistive Loads
Date: 3rd January 2019
Time &Venue: 2:00 PM at ESB 244
Speaker: Vaishnavi R (EE15D029)
Guide: Dr. Lakshminarasamma
Dr. Krishna Vasudevan (Chairperson)
Dr. Kamalesh Hatua
Dr. Aniruddhan S
Dr. Sujatha N (AM)
High Voltage Low Power (HVLP) supply encompasses a broad application spectra such as analytical instruments for spectroscopy, ion mass analyzers, smart material based actuators etc. Majority of such instruments are electrically modeled as low power resistive or pulsed / non pulsed capacitive load. These instruments are battery fed, operate with low power (typically in the range of 200 mW – 5W), and demand high voltage drive in the range of 1 – 3 kV for their effective operation. An intermediate power processing circuitry is essential to step up the voltage and cater the application requirements. Flyback converter is widely preferred for low power applicationsconsidering its compact structure with lesser component count.
The dominant factor that influences a HVLP converter operation is the parasitic capacitance of the HV flyback transformer and semiconductors. A significant portion of input energy per cycle is utilized in charging the parasitic capacitances of the circuit, which is circulated back to the source at the end of every switching cycle.This energy transfer phenomena involving parasitic capacitances result in reduced fraction of input energy reaching the load in every switching cycle, thereby resulting in an apparent deviation in converter operating point in comparison to ideal flyback converter feeding resistive loads.
In this work, an analytical energy based model which includes the effect of parasitic capacitances, valid for steady state and dynamics of HVLP flyback converter is proposed. The proposed analytical model is verified through simulation and experimental results on 1.5 kV / 5 W and 1.5 kV / 200 mW resistive load.
ALL ARE CORDIALLY INVITED!