Current fed inverter application as a controllable DC load

High precision electronic DC loads are necessary for testing the characteristics of switching power supplies, DC power sources such as photovoltaics, fuel cells. Variable electronic loads can be controlled from a remote computer for testing equipment in remote areas and other specific research & development or educational purposes. Electronic loads can also be used in distant control of the test equipment. This paper presents an application of a current fed inverter as controllable DC load. The studied topology is a parallel full bridge inverter with thyristors. The control loop is based on a PI regulator and is realized by variable switching frequency and constant duty ratio.