Implementation of a Primary Tapped Transformer in a High Frequency Isolated Power Converter

Abstract: On load, transformer primary tap changing is not common in high frequency converters. This paper investigates a new converter topology to drive primary tapped transformers. The ideas that have been introduced previously are simply implemented into existing converter topologies which have been modified to accommodate a primary tapped transformer. The effects of efficiency with variation of source voltage and duty cycle are studied. It is shown that this topology can maintain a load voltage for a much wider source voltage variation without major sacrifices in efficiency

Some considerations for miniaturized measurement shunts in high frequency power electronic converters.

Abstract: Power semi-conductors are able to achieve switching transients within a few nanoseconds and possibly even faster. These fast switching transients will need to be measured and analyzed thoroughly. In this paper four different types of shunt constructions and installations are tested on the same power electronics circuit, giving widely diverse results. Interpreting and analyzing these measurement results will assist in developing accurate current measurement devices for fast switching transient power electronic converters of the future

An experimental study of switching GaN FETs in a coaxial transmission line

Abstract: The switching characteristics of GaN FETs have not yet been measured accurately because of their small electromagnetic size in relation to the circuit and the electromagnetic environment the measurements are exposed to. Switching GaN FETs in a transmission line will allow for measurements to be taken in an electromagnetically defined environment. The transmission line is adapted to take optimum measurements. This is proven by the waveforms presented

Introducing Tapped Transformers And Coupled Inductors High Frequency Isolated Power Converters With Vary Source Voltage

Abstract: Tapped transformers are often used for voltage regulation in low frequency applications. Tapped secondary transformers are found in high frequency converters but usually only on the secondary windings to provide multiple isolated output voltages. This paper is aimed at investigating the use of multiple switched primary transformer taps in applications where the supply voltage varies over a wide range. A few of the standard converter topologies, modified to accommodate multiple primary taps, are shown and the principle is demonstrated on a push-pull topology

On Primary Tapped Transformers In High Frequency Isolated Power Converters

Abstract: Primary tapped transformers have been introduced through various topologies. These tapped transformer topologies are simply modifications of existing topologies. This paper investigates the concept of a primary tapped transformer in a high frequency isolated topology. The effect on efficiency with variation in supply voltage is studied and it is shown that the bulk capacitance required reduces drastically