Date: 26th August 2019
Time & Venue: 2:00 PM at ESB 244
Speaker: Vaishnavi R (EE15D029)
Guide: Dr. Lakshminarasamma
Certain applications such as an ion mass analyzer and smart material based actuators demand programmable high voltage drive in the range of 0 – 2.5 kV for their effective operation. These applications are fed from low voltage battery source and electrically resemble a capacitive load. An intermediate power processing circuitry is essential to step up the voltage and meet the load requirements. Flyback converter is used for high voltage and low power applications considering its compact structure with lesser component count.
In High Voltage Low Power flyback charging circuit, significant portion of input energy drawn from the source in a cycle is utilized by the effective parasitic capacitance of the HV transformer and semiconductor devices and circulated back to the source at the end of the cycle. This reduces the energy delivered to the load per cycle and hence the net energy delivered in the charging process.
In this talk, an energy based analysis for high voltage low power charging circuits including the significant parasitic capacitance effect will be discussed. A simplified energy based model depicting the high voltage low power converter behaviour is proposed and extended to obtain analytical closed form expressions governing the essential parameters of the charging circuit. The proposed energy based model and analytical formulation of essential parameters are experimentally validated on a 0 – 2.5 kV programmable high voltage charging circuit prototype fed from 12 V input source.
All are cordially invited.