Optimal Design of Resonant Gate Driver for Buck Converter Based on a New Analytical Loss Model

Integration is a key way to improve the switching frequency and power density for a DC-DC converter. A monolithic integrated GaN based DC-DC buck converter is realized by using a gate driver and a half-bridge power stage. The gate driver is composed of three stages (amplitude amplifier stage, level shifting stage and resistive-load amplifier stage) to amplify and modulate the driver control signal, i.e., CML (current mode logic) level of which the swing is from 1.1 to 1.8 V meaning that there is no need for an additional buffer or preamplifier for the control signal. The gate driver can provide sufficient driving capability for the power stage and improve the power density efficiently. The proposed GaN based DC-DC buck converter is implemented in the 0.25 μm depletion mode GaN-on-SiC process with a chip area of 1.7 mm × 1.3 mm, which is capable of operating at high switching frequency up to 200 MHz and possesses high power density up to 1 W/mm2 at 15 V output voltage. To the authors’ knowledge, this is the highest power density for GaN based DC-DC converter at the hundreds of megahertz range.

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Multi-Physics Multi-Objective Optimal Design of Bearingless Switched Reluctance Motor Based on Finite-Element Method

Energies ◽

10.3390/en12122374 ◽

2019 ◽

Vol 12 (12) ◽

pp. 2374 ◽

Cited By ~ 2

Author(s):

Jingwei Zhang ◽

Honghua Wang ◽

Sa Zhu ◽

Tianhang Lu

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Optimal Design ◽

Switched Reluctance Motor ◽

Loss Model ◽

Switched Reluctance ◽

Multi Objective ◽

Initial Design ◽

Reluctance Motor ◽

Comprehensive Framework

The bearingless switched reluctance motor (BSRM) integrates the switched reluctance motor (SRM) with the magnetic bearings, which avoids mechanical bearings-loss and makes it promising in high-speed applications. In this paper, a comprehensive framework for the multi-physics multi-objective optimal design of BSRMs based on finite-element method (FEM) is proposed. At first, the 2-D electromagnetic model of a fabricated initial design prototype is built and solved by the open-source FEM software, Elmer. The iron loss model in Elmer based on the Fourier series is modified by a transient iron loss model with less computation time. Besides, a simplified lumped-parameter (LP) thermal model of the BSRM is applied to estimate the temperature rise of BSRM in the steady state. Then, the comprehensive framework for the multi-physics multi-objective optimal design of BSRMs based on FEM is proposed. The objectives, constraints, and decision variables for optimization are determined. The multi-objective genetic particle swarm optimizer is utilized to obtain the Pareto front of optimization. The electromagnetic performance of the final optimal design is compared with the initial design. Comparison results show that the average electromagnetic torque and the efficiency are significantly enhanced.

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A new resonant gate driver for switching loss reduction of high side switch in buck converter

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) ◽

10.1109/apec.2010.5433425 ◽

2010 ◽

Cited By ~ 16

Author(s):

Xin Zhou ◽

Zhigang Liang ◽

Alex Huang

Keyword(s):

Buck Converter ◽

Loss Reduction ◽

Switching Loss ◽

High Side ◽

Gate Driver

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RANCANG BANGUN DC – DC CONVERTER BERBASIS MICROCONTROLLER STM32F4 DAN MATLAB/SIMULINK

JTT (Jurnal Teknologi Terpadu) ◽

10.32487/jtt.v8i1.777 ◽

2020 ◽

Vol 8 (1) ◽

pp. 26-33

Author(s):

Hilmansyah Hilmansyah ◽

Restu Mukti Utomo

Keyword(s):

Renewable Energy ◽

Duty Cycle ◽

Buck Converter ◽

Matlab Simulink ◽

Gate Driver

DC – DC converter banyak diplikasikan pada renewable energy, sel surya, sistem pengecasan baterai dan mobil listrik. Salah satu metode pada DC – DC converter adalah buck converter. Pada buck converter, tegangan keluaran lebih kecil dari tengangan masukkannya. Pada paper ini, buck converter didesain menggunakan microcontroller STM32F4 berbasis MATLAB/Simulink, TLP521 sebagai pengaman rangkaian daya buck converter dan rangkaian kendali STM32F4, IGBT FGH75T65UPD sebagai komponen switching, dan IR 2111 yang berfungsi sebagai gate driver untuk IGBT. Penanaman program STM32F4 dari MATLAB/Simulink menggunakan waijung blockset. Tegangan masukan pada buck converter didesain sebesar 35 V dengan tegangan keluaran sebesar 3,5 V sampai dengan 31,5 V dengan frekuensi switching pada IGBT maksimum sebesar 100 kHz. Data pada hasil eksperimen menunjukkan bahwa perubahan pada duty cycle akan berpengaruh pada tegangan keluaran, arus keluaran dan effisiensi dari buck converter.

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