A Matlab simulator tool for a class E power amplifier designed to generate plasma torch

Abstract

The concept of “class E” was introduced by N. O. Sokal and A. D. Sokal, offering a new concept of high efficiency power amplifiers. The class E power amplifier is not defined by a special topology. The chosen circuit is a tuned amplifier, consisting of a single switch and a load network. The load network configuration consists of the shunt capacitance, series inductance, and series filter tuned to the fundamental frequency to provide a high level of harmonic suppression. This working class has the advantage of their design simplicity and high efficiency operation. Using the basic equations for class E amplifier, a user friendly graphic interface was implemented. This interface is a useful tool for simulations and design. Using this interface various waveforms from the circuit can be viewed so the real values of circuit components can be accurately estimated. Also the interface calculates the power efficiency, power consumption for different loads, etc. The power amplifier designed using this tool is used to generate plasma torch. In these torch is placed an earth sample using Argon gas as the transporter. A spectrometer is placed near plasma and is connected to a laptop. With this system is possible to detect the chemical composition of the earth sample. So, the entire system can be used in chemical determinations of the earth sample. The main advantage of this application consist in portability, efficiency and easy to use the system.