The speaker has a background in power electronics design and has been designing power supplies for plasma cutting applications for the past 17 years. Plasma cutting in a nutshell is a popular technology that converts gas such as air or oxygen into the plasma state to cut metal. In this two part talk, the speaker will begin with an overview of a typical plasma cutting system. The ignition circuit, which is a typically a Tesla coil based High-Voltage High- Frequency circuit is used to initiate the conversion of gas to plasma at the beginning of cut cycle. This circuit arguably makes Plasma cutting unique among the list of industrial electronics applications. An EM fields based modeling analysis of two versions of the Tesla coil transformer, a conventional version and an alternate planar version will be presented. The application of this circuit brings with it certain practical challenges, mainly related to radiated emissions.. This will be the subject matter for the second part of the talk. Here, the speaker will describe briefly the mechanics of radiated emissions due to operation of this circuit. It will be seen that cables play an important role in EM noise radiation. To address this problem, a low cost diagnostic tool to measure the antenna effects of cables is being developed. The proposed technique is being developed with a simple test cable case and verified with its 3D RF physics model. Details of the investigation along with experimental and modeling results will be presented. The talk will end with future scope of work in this area.
Girish graduated with an MS degree in 1996 followed by a Ph.D in Electrical Engineering from the University of Minnesota in 1998. He has been working in the Motor Drives and Plasma Cutting industries since then. He currently designs power electronics systems and controls for plasma cutting power supplies. His main areas of interest are multi-physics modeling approach to power supply component design, High Voltage circuits, Electromagnetic Compatibility and Digital Control.