Wyniki wyszukiwania - BazTech

1

Resonant step-down DC-DC converter based on GaN power integrated circuits and SiC diodes

Stala Robert, Folmer Szymon, Mondzik Andrzej

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2024

|

Vol. 72, nr 5

art. no. e150116

EN

In the paper results of the operation and efficiency of a DC-DC resonant converter with a switched capacitor topology, equipped with GaN transistors and SiC diodes are presented. Investigated problems are related to the optimization of the DC-DC power electronic converter in order to achieve miniaturization, a simplified design, and high efficiency. The proposed system operates at a high frequency with low switching losses. The proposed design helps to achieve uniform heating of the transistors and diodes, as demonstrated by the results of the thermal imaging measurements. The GaN transistors are integrated into one package with dedicated gate drivers and used to simplify the circuitry of drivers and increase the power density factor of the proposed device. In the high-frequency design presented in the paper, the converter is implemented without electrolytic capacitors. The results included in the paper contain waveforms recorded in the power circuit at ZVS operation when switching on the transistors. It occurs when the system operates above the frequency of current oscillations in the resonant circuit of the switched capacitor. Efficiency characteristics and a voltage gain curve of the converter versus its output power are presented as well. The results of efficiency and quality of waveforms are important because they facilitate characterizing the tested system for implementation using WBG devices. The use of integrated GaN modules to minimize elements in the physical system is also unique to this model and it allows for very short dead-time use, and operation in ZVS mode at low reverse-conduction losses.

2

Single-source three-phase switched-capacitor-based MLI

Jena Kasinath, Gupta Krishna Kumar, Bhatnagar Pallavee, Jain Sanjay K., Stala Robert, Waradzyn Zbigniew, Piróg Stanisław, Penczek Adam, Mondzik Andrzej, Skała Aleksander

Power Electronics and Drives

|

2022

|

Vol. 7 (42)

197--209

EN

This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation.

3

SiC-based magnetic-less DC-DC converter with wide temperature range operation

Chojowski Maciej, Stala Robert, Mondzik Andrzej, Penczek Adam

Przegląd Elektrotechniczny

|

2021

|

R. 97, nr 1

56--63

EN

This paper presents a concept and experimental results of the magnetic-less converter suitable for wide temperature range operation. The DC-DC converter uses a variant of a switched-capacitor voltage multiplier topology, silicon carbide (SiC) and IGBT (insulated gate bipolar transistor) semiconductors and resonant circuits with air-based chokes designed on PCB (printed circuit board), as well as high temperature resonant capacitors and PCB materials. Ferrite materials are not required which and therefore the problems with inductance variation versus temperature do not exist.

PL

W artykule przedstawiono koncepcję i wyniki doświadczalne przekształtnika do pracy w szerokim zakresie temperatur. W przekształtniku zastosowano wariant topologii rezonansowo przełączalnych kondensatorów, półprzewodniki z węglika krzemu (SiC) i IGBT oraz obwody rezonansowe z dławikami powietrznymi zaprojektowanymi na PCB, a także wysokotemperaturowe kondensatory rezonansowe oraz specjalny materiał PCB. Rdzeń ferrytowy nie został tu zastosowany, a zatem nie istnieje problemy ze zmianą indukcyjności w zależności od temperatury pracy układu.

4

All-Bootstrap Gate-Driver Supply System for a High-Voltage-Gain Resonant DC-DC Converter with Seven Switches

Stala Robert, Mondzik Andrzej, Penczek Adam, Waradzyn Zbigniew, Skała Aleksander

Power Electronics and Drives

|

2020

|

Vol. 5 (40)

135--142

EN

This paper presents the concept and implementation of an electronic system for a switched-capacitor DC-DC converter with high voltage gain. The converter consists of seven switches, five of which being controlled like high-side type. This paper presents a non-typical bootstrap-based gate-driver system so that the converter can run using a single voltage source. The converter requires a special switching pattern to drive seven switches in a steady state and also during the start-up of the converter and the regulation of the output voltage. Therefore, an FPGA-based digital control system is used with various switching algorithms and protection functions implemented. The presented converter is an autonomic device that taps the energy from the main input. Therefore, the electronic system of the converter is equipped with a self-supply system with a wide range of the input voltage. The parameters of the converter such as voltage gain, voltages and power ranges can be scalable for prospective applications with the proposed control system.