Isolated DC-DC converters with high-output voltage for TWTA telecommunication satellite applications

Abstract

Two alternatives for the implementation of an isolated dc-dc converter operating with a high output voltage and supplied by an unregulated low input voltage are presented in this paper. The proposed topologies are especially qualified for the implementation of travelling wave tube amplifiers (TWTA) utilized in telecommunication satellite applications due to their low mass and volume and their high-efficiency. The converters studied follow different principles and the main operational aspects of each topology are analyzed. A two-stage structure composed by a regulator connected in series with a ZVS/ZCS isolated dc-dc converter is the first topology proposed. The second topology studied is an isolated single-stage converter that continues being highly efficient even with a large input voltage variation. The experimental results obtained from two prototypes, implemented following the design procedures developed, are presented, verifying experimentally the characteristics and the analysis of the proposed structures. The prototypes are developed for an application requiring an output power of 150 W, a total output voltage of 3.2 kV and an input voltage varying from 26 V to 44 V. The minimum efficiency obtained for both converters operating at the nominal output power, is equal to 93.4% for the two-stage structure and equal to 94.1% for the single-stage converter.

An improved partially interleaved transformer structure for high-voltage high-frequency multiple-output applications

“…The high-voltage power supplies with multiple outputs are widely used in Travelling-Wave Tube Amplifiers [1] (TWTAs), lasers [2] , Magnetic Resonance Imaging (MRI) [3] , where several high-voltage outputs are required by the system. Nowadays, the power supplies are moving toward high power density and high efficiency, especially with the occurrence of novel power switches, such as GaN and SiC devices [4,5] .…”

Conversor CC-CC Paralelo Ressonante Meia Ponte Assimétrico com Saída em Tensão

“…Uma das principais características que diferencia os conversores ressonantes é a conexão dos elementos do circuito ressonante (também denominados de circuito tanque), sendo as configurações mais empregadas a série ressonante, a paralelo ressonante e a série paralelo ressonante [7]. Quanto ao estágio inversor de entrada, existem algumas possibilidades de implementação, como o meia ponte [5], [14], [20], [21], o ponte completa [1], tipo T [22] e push-pull [4]. Para o retificador de saída, os mais utilizados são o ponte completa com ponto médio, o ponte completa [1] e o dobrador de tensão [22].…”

Single-Stage Reconfigurable DC/DC Converter for Wide Input Voltage Range Operation in (H)EVs

“…E-mail: sandra.zeljkovic @infineon.com * Infineon Technologies AG Am Campeon 1-12, Neubiberg, Germany * * Universität der Bundeswehr München Werner-Heisenberg Weg 39, Neubiberg, Germany In certain carefully optimized designs, the reduced amount of total losses and the reduction of the converter volume can be achieved with a two-stage topology in automotive applications with wide input and output voltages (5) . Still, an additional hard-switching converter in series that is required in such cases is usually undesirable due to additional components and power losses (6) . Furthermore, with a HV-battery pack at the input of the converter, there is no need for a power factor correction stage (PFC) typical for front-end converters.…”