FEATURES OF WIDEBAND DEVELOPMENT OF RESISTANCE TRANSFORMERS IN HF RANGE, LOADED ON LOW-IMPEDANCE ABSORBERS

A device based on a resistance transformer for matching a low-resistance load, including an electrically small short-wave antenna, with a transceiver equipment is described. The results of prototyping and modeling of broadband matching transformers with ferrite cores with transformation ratios 4:1, 9:1, and 25:1 are presented. A model of a matching transformer operating on a low-resistance absorber is proposed. The results of measurements and modeling of the effect of frequency dependences of the complex resistance of low-resistance resistors of various types used as loads on the measured characteristics of transformers are presented. An increase in the influence of parasitic parameters of the load, winding terminals, compensating reactivity of elements and the transformer itself on its characteristics with a decrease in the load resistance is shown.

Analysis of Transformer and Transformerless DC-DC Converter for Renewable Energy System

This paper tells about a comparative analysis of DC-DC converter for renewable energy system. DC-DC converter with transformer has been proved that it is suitable to the electrolysis application. High frequency voltage matching transformer is used in this topology, due to the high input and output voltage difference. In this comparation is done with and without transformer to obtain the stabilized output voltage. The MATLAB simulation result shows that the output voltage with transformer is free from ripples.