Martin Olejár

CHUA'S SINGULARITIES: GREAT MIRACLE IN CIRCUIT THEORY

In the work [Chua, 1992], a deep intuition of its author gave rise to the choice of singularities corresponding to Chuas circuit. Therefore, it is the only one probably exhibiting three saddle points named Chuas singularities in this paper. One of the singularities is a saddle in forward time (dt > 0) of integration, whereas the other two are saddles in backward time (dt < 0) of integration. In the following, the term Chuas Chaos denotes chaos related to Chuas singularities. These singularities are the source of all special surfaces that are the subject of this contribution. We named the surface to which all other surfaces are bound as the Double-Arm Stable Manifold (DASM). The beauty and multifunctionality of this surface represents the unfathomable Intelligence in the sense of [Tolle, 2003]. The presence of the DASM in the state space is a sufficient condition for the generation of Chuas chaos or corresponding periodic windows. Since Chuas singularities are not limited by circuit morphology or the order of state equations, the research on Chuas chaos seems to be still very promising.

Bi-directional DC/DC converter for hybrid battery

Bi-directional buck-boost DC/DC converter for hybrid battery controlled by UC3637 is described in this paper. The first part of the paper is aimed at concept of hybrid battery. Design of power circuit and control circuit with UC3637 of converter is described in the second part of the paper.

Analysis of Selected Photovoltaic Panels Operating Parameters as a Function of Partial Shading and Intensity of Reflected Radiation

Abstract Due to expansion of utilisation of photovoltaics in ordinary households, the question arises how this phenomenon affects the electric power of photovoltaic modules. The article deals with the electric power analysis of photovoltaic modules as a function of two very important factors. The first examined factor was partial shading, and the second factor was the intensity of reflected radiation. In order to determine the dependence of module power on the aforementioned parameters, a measurement system under laboratory conditions has been prepared. For identification of the reflected radiation effect on the power of the photovoltaic module, a series of measurements was performed on 7 different surfaces with the same radiation source. It is evident from obtained experimental result that the ratio of reflected irradiation on the solar module power is 1.29%. By simulation of partial shading of photovoltaic module, the decrease of 86.15% in its output power was identified.

Simulation of the Chua's circuit with audio output

This contribution is oriented to extend the possibilities of circuits simulation illustration that can be used in music or sensor technology. A typical example is Chuas circuit, which at bifurcation of only one parameter can generate a number of attractors. These can be showed not only in image format, but also as sound using Matlab application. It allows you to do a more complex vision of the bifurcation parameter impact in the circuit to the output signal.

Navigation Algorithm Using Fuzzy Control Method in Mobile Robotics

The issue of navigation methods is being continuously developed globally. The aim of this article is to test the fuzzy control algorithm for track finding in mobile robotics. The concept of an autonomous mobile robot EN20 has been designed to test its behaviour. The odometry navigation method was used. The benefits of fuzzy control are in the evidence of mobile robot’s behaviour. These benefits are obtained when more physical variables on the base of more input variables are controlled at the same time. In our case, there are two input variables - heading angle and distance, and two output variables - the angular velocity of the left and right wheel. The autonomous mobile robot is moving with human logic.