Implementation of monolithic bidirectional switches in a AC/DC Dual Active Bridge in ZVS auto-switching mode

2018 ◽  
Author(s):  
Sterna Leo ◽  
Ferrieux Jean-Paul ◽  
Frey David ◽  
Jeannin Pierre-Olivier ◽  
Perichon Pierre ◽  
...  
Keyword(s):  
Dual Active Bridge ◽  
Switching Mode ◽  
Bidirectional Switches

scholarly journals Wide Load Range Capacitor Clamped ZVZCS Half Bridge Three-level DC-DC Converter with Two Unsymmetrical Bi-directional Switches

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2362 ◽  
Author(s):  
Shi
Keyword(s):  
Input Voltage ◽  
Industrial Applications ◽  
Reverse Direction ◽  
Basic Operation ◽  
Load Range ◽  
Imbalance Problem ◽  
Zero Current Switching ◽  
Zero Current ◽  
Switching Mode ◽  
Bidirectional Switches

This paper presents a zero-voltage and zero-current switching (ZVZCS) capacitor-clamped half bridge (HB) three-level dc-dc converter (TLDC), which is well fit for high input voltage dc-dc industrial applications. The maximum voltage stress of the primary switches is limited by the flying capacitor and input capacitors, which is very close to Vin/2. Two unsymmetrical bidirectional switches are used to replace two of the primary switches in a conventional capacitor-clamped HB TLDC, which ensure ZVZCS of the main switches in wide load range. The reverse direction MOSFETs in the unsymmetrical bidirectional switches have low on-state resistance and are controlled with soft-switching mode irrelevant to the load current. Therefore, the additional power loss can be omitted. The current of the flying capacitor is greatly reduced due to ZVZCS operation, which would result in a smaller volume flying capacitor and high system reliability. Furthermore, the current imbalance problem of the power devices is also well solved. The circuit, basic operation principles and some important technical analyses are discussed in this paper, and experimental results from a 1-kW prototype are provided to evaluate the proposed converter.

scholarly journals General Analysis of Switching Modes in a Dual Active Bridge with Triple Phase Shift Modulation

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2419 ◽  
Author(s):  
Carlos Calderon ◽  
Andres Barrado ◽  
Alba Rodriguez ◽  
Pedro Alou ◽  
Antonio Lazaro ◽  
...  
Keyword(s):  
Phase Shift ◽  
Output Power ◽  
Output Voltage ◽  
Power Flow ◽  
Voltage Range ◽  
Zero Voltage Switching ◽  
Dual Active Bridge ◽  
Energy Flows ◽  
Zero Current Switching ◽  
Switching Mode

This paper provides an exhaustive analysis of the Dual-Active-Bridge with Triple-Phase-Shift (DAB-TPS) modulation and other simpler ones, identifying all the possible switching modes to operate the DAB in both power flow directions, and for any input-to-output voltage range and output power. This study shows four cases and seven switching modes for each case when the energy flows in one direction. That means that the DAB operates up to fifty-six different switching modes when the energy flows in both directions. Analytical expressions for the inductor current, the output power, and the boundaries between switching modes are provided for all cases. Additionally, the combination of control variables to achieve Zero-Voltage-Switching (ZVS) or Zero-Current-Switching (ZCS) is provided for each case and switching mode, by showing which switching modes obtain ZVS or ZCS for the whole power range and all switches—independent of the input-to-output voltage ratio. Therefore, the most interesting cases, switching mode and modulation for using the DAB are identified. Additionally, experimental validation has been carried out with a 250 W prototype. This analysis is a proper tool to design the DAB in the optimum switching mode, reducing the RMS current and achieving to increase efficiency and the power density.

Current Reduction Method for Dual Active Bridge Converter in Non-linear Dead-time Compensation Method

2020 ◽  
Vol 140 (3) ◽  
pp. 175-183
Author(s):  
Kengo Kawauchi ◽  
Hayato Higa ◽  
Hiroki Watanabe ◽  
Keisuke Kusaka ◽  
Jun-ichi Itoh
Keyword(s):  
Reduction Method ◽  
Dead Time ◽  
Compensation Method ◽  
Dual Active Bridge ◽  
Non Linear ◽  
Dead Time Compensation ◽  
Current Reduction

scholarly journals Wideband-Narrowband Switchable Tapered Slot Antenna for Breast Cancer Diagnosis and Treatment

2021 ◽  
Vol 11 (8) ◽  
pp. 3606
Author(s):  
Seonho Lim ◽  
Young Joong Yoon
Keyword(s):  
Breast Cancer ◽  
Coupling Effect ◽  
Breast Cancer Diagnosis ◽  
Microwave Imaging ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Pin Diode ◽  
Time Frequency ◽  
Switching Mode ◽  
Meander Line

In this paper, a wideband-narrowband switchable tapered slot antenna (TSA) with a compact meander line resonator for an integrated microwave imaging and hyperthermia system was proposed. A compact meander line resonator, which exhibited band-pass characteristics and provided narrowband characteristics by using one PIN diode, was fabricated beneath the tapered slot of the wideband TSA to minimize the degradation of the wideband characteristics. Moreover, the electromagnetic energy was transferred to the meander line resonator with a coupling effect to ensure effective frequency switching. By adapting a PIN diode on the meander line resonator, frequency switching could be achieved. In this way, the proposed antenna could operate in a real-time frequency switching mode between the ultra-wideband (UWB; 3.1~10 GHz), which is used for microwave imaging, and the 2.45 GHz band (industrial, scientific, and medical, ISM band), which is used for microwave hyperthermia. Frequency and time-domain results proved the applicability of the proposed antenna to an integrated breast cancer detection and treatment system.

Sign in / Sign up

Export Citation Format

Share Document