Current Issue : July-September Volume : 2025 Issue Number : 3 Articles : 5 Articles
In this paper, a 3.2–3.6 GHz two-stage Doherty power amplifier (PA) module is proposed for fifth-generation (5G) massive multiple-input multiple-output (MIMO) base stations. A detailed design method and procedure for a compact and low-loss combiner suitable for the Doherty PA module are introduced. Based on the proposed combiner, a Doherty PA module is implemented using gallium nitride (GaN) transistors and surfacemounted devices (SMDs) with a packaged size of 8 × 8 mm2. The proposed two-stage Doherty PA module achieves a 3 dB small-signal bandwidth of 3.1–3.9 GHz and a peak gain of 31.7 dB. From 3.2 to 3.6 GHz, the saturated output power is 40.4–41.1 dBm. Moreover, the measured saturated drain efficiency (DE) and 8 dB power back-off (PBO) DE reach 51–56.6% and 45.5–48.6%, respectively....
Power electronics are widely used in power and energy systems, such as electrified transportation and renewable energy systems. These systems are increasing related simulations’ size and complexity, resulting in longer computation times. Advanced computing techniques offer new tools for efficient simulation while designing and simulating complex energy systems. This paper introduces high-performance computing for intensive power electronics simulation and demonstrates resultant simulation speedup in a quantified and scalable manner. First, a quantitative study is performed to compare a slower-than-real-time (STRT) simulation benchmark and the proposed faster-than-real-time (FTRT) simulation through a single power electronics building block (PEBB) case study. The impact of switching frequencies in the range of tens to hundreds of kHz considering wide bandgap (WBG) power semiconductors is also investigated. The simulation speed is observed to be accelerated by a factor of 43.8 when using high-performance computing techniques compared to the sequential-based simulation benchmark. Next, a scalable simulation framework is proposed for expanding a single PEBB to an energy system consisting of multiple PEBBs. The framework leverages the high-performance programming language Julia with multi-threaded parallel computing capabilities to reduce the computational burden of power system simulation. The performance gains from the case study demonstrate an average speedup of 2540 times in a 15.0 s multi-PEBB simulation case study compared to its baseline version, with maintained simulation accuracy and ensured scalability....
High-density electronics packaging requires fabrication of intricate conductive and dielectric features within a dense threedimensional structure. Simultaneous deposition of both conductive and insulative printing materials using multimaterial additive manufacturing (AM) provides new opportunities to fabricate electronics packages with complex designs. This article reports the first demonstration of fully printed power die-embedded electronics package for wide band-gap devices. For this purpose, multimaterial inkjet AM was used to print a 0.5-mm thick electronics package for gallium nitride (GaN) power chips. The conductive parts of the package, including traces and vias, were printed using a high electrical conductivity silver ink, while a polyimide ink was used to print dielectric parts. The electrical characterization tests showed the reasonable performance of the printed package. While the conventional embedded packaging includes many steps such as laminating, plating, and drilling, which creates significant material waste and environmental issues, the proposed AM approach is done in a single step without material waste....
This paper systematically explores the fundamental properties of MXene materials and their potential applications in the field of power electronics. As an emerging twodimensional material, MXene exhibits excellent conductivity, good thermal conductivity, and highly tunable structures, thereby demonstrating significant advantages in applications such as energy storage, heat dissipation, and flexible electronics. The paper first introduces the structural characteristics and preparation methods of MXene, followed by a detailed analysis of its applications in various power electronic devices, including supercapacitors, batteries, and energy storage systems. Finally, the challenges MXene faces in practical applications are discussed, along with possible future development directions. Through this analysis, the paper aims to provide theoretical support and reference for the further research and application of MXene materials in the field of power electronics....
This paper proposes a hybrid multi-vector model predictive control (MPC) to reduce the harmonic content in the output current of a two-level virtual synchronous generator (VSG). Compared to traditional two-vector MPC, the proposed hybrid multi-vector MPC has twelve sets of voltage vectors, meaning that the number of iterative calculations required in each cycle is identical for both control methods. Compared to the three-vector MPC, the proposed method requires more iterative calculations per control period but achieves optimal harmonic content in the output current. In addition, different from the traditional MPC methods, this paper incorporates frequency variation weights into the cost function, which further reduces the harmonic content in the output current. Finally, the effectiveness of the proposed control strategy is validated through a simulation model built in MATLAB/Simulink....
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