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关键词： traditional coolant   thermal performance   nano-fluids   thermal conductivity   consideration  

摘要： The thermal performance of Liquid-cooled plate (LCP) can be improved by using different kinds of materials and coolants. Suitable and effective coolant can bring better cooling capacity to cope with the impact of high temperature on IGBT chips, and improve the safety and service life of new energy metallurgical loaders. In this context, the recent progress of the effects of traditional coolants, nano-fluids, ethylene glycol and oil on the heat transfer capacity of the liquid cooling plate is reviewed in detail. Nanofluids have been identified as the most prominent cooling method at present because of their good thermal conductivity. In addition, the considerations and advantages and disadvantages of using different coolants are discussed in depth.

关键词： Insulated gate bipolar transistors (IGBT)  

摘要： This paper investigates the impact of bond wire aging on differential mode (DM) electromagnetic interference (EMI) noise emissions in IGBTs under the influence of high-frequency ringing. Using a DC-DC buck converter composed of an IGBT half-bridge module as an example, the study analyzes the changes in the EMI spectrum caused by bond wire lift-off in both the time and frequency domains. The paper explains the generation mechanism of high-frequency oscillations induced by the interaction between the stray inductance of the DC link and the freewheeling diode. The study reveals that bond wire lift-off alters DM EMI noise emissions by affecting the switching characteristics of the IGBT. Additionally, an increase in the number of lift-off bond wires during ringing significantly enhances DM EMI noise emissions at and above the resonance frequency. The findings of this study provide a new perspective on the aging effects of power electronic devices and their impact on EMI. © 2001-2011 IEEE.

关键词： Inverters   Logic gates   High-voltage techniques   Wireless communication   Resonant frequency   Insulation   Coils   Wireless power transfer   Insulated gate bipolar transistors   Wireless sensor networks   IGBT   gate drive circuit   galvanic isolation   inductive wireless transfer   three-phase inverter  

摘要： When driving an IGBT in a high-voltage inverter, the gate drive circuit requires high insulation for both the control signal and the power supply circuit. Non-integrated photo couplers are often used to isolate control signal circuits, and custom-made transformers for DC-DC converters are used to isolate power supply circuits. Because the floating gate drive circuit is located on the high-voltage side, the system with non-integrated photo couplers and custom-made transformers has low reliability and complexity, therefore, there is a high demand for robust and simple isolation methods. In this paper, a highly reliable and simple isolation method that utilizes simultaneous inductive wireless transfer for both the control signal and power is proposed, and the gate drive circuit is moved to the low-voltage side for high-voltage inverters used in large industrial motors and DC power transmission converters. Using the proposed method, it is easy to access the gate drive circuit and the insulation configuration becomes robust and simple compared with conventional systems. The effectiveness of this method is verified using a 40-V prototype three-phase inverter. A three-phase motor is successfully driven using the proposed prototype.

关键词： Insulated gate bipolar transistors (IGBT)  

摘要： Effective condition monitoring (CM) technology ensures the safe operation of insulated gate bipolar transistors (IGBTs). Most CM methods for IGBTs focus on extracting electrical, thermal, and magnetic parameters. Recent studies indicate that at the switching moment, IGBTs can emit the switching stress wave (SSW) that is detectable by the acoustic emission (AE) sensors. However, using these SSWs to monitor the health status of IGBTs, even for discrete devices with relatively simple package structures, remains challenging. This paper investigates how SSWs from discrete IGBTs during power cycling change as bonding wires degrade and whether these waves are promising for monitoring the condition of internal bonding wires. In this work, a power cycle test platform and an SSW test platform for discrete IGBTs are built, and SSWs from discrete IGBTs during power cycling are analyzed. Results show that SSWs vary with the degradation of the device's bonding wires, with changes in the time domain indicator of signal energy, reflecting SSW strength, and the frequency domain indicator of the center of gravity frequency, reflecting frequency shifts. These findings suggest the possibility for developing acoustic emission-based detection technology (AEDT) in CM of the IGBT. © 2013 IEEE.

关键词： 变频器   PLC控制器   刨床控制系统  

摘要： 在B2025型龙门刨床的原设计方案中，通过电压进行调速，控制精度较差，不利于材料加工。研究基于PLC和变频器，对该型刨床控制系统进行改造，在硬件设计中，介绍了PLC、直流调速器、变频电机、变频器、减速机和旋转编码器的选型。以刨削功能为改造重点，分析了刨床自动控制程序、位置调整程序的流程。最后提出模糊自适应PID控制器的设计方案，经仿真测试，该控制系统的超调量、延迟时间等得到明显改善。

关键词： Insulated gate bipolar transistors (IGBT)  

摘要： Sensorless control under open-circuit faults is challenging for classic three-phase half-bridge motor drives. This paper proposes a method that exploits the correlation between back-electromagnetic force (back-EMF) and diode-through residual current in the IGBT open-circuit phase. First, the residual current model is developed, followed by a sampling strategy that unifies the model under different speeds. Using this unified model, a phase back-EMF observer is designed, enabling accurate postfault estimation of rotor speed and position. Experimental validation demonstrates the effectiveness of the proposed method, achieving an estimation error of 0.3 radians under steady-state conditions and 0.5 radians during acceleration and deceleration. © 2025 IEEE. All rights reserved.

关键词： 数字孪生   多物理仿真   科学机器学习   非侵入式模型降阶   算子推理  

摘要： 提出了一种新型数据物理双轮驱动的科学机器学习方法，可实现对大规模异质结构集成芯片的多物理系统超实时预测，构建真正具备物理内核的数字孪生模型。科学机器学习方法是一种非侵入式的模型降阶方法，主要包含时空快照降阶、低维算子推理两大模块。数十万自由度的IGBT电-热-力多物理耦合系统数值仿真实验表明，该方法仅使用前30%时域快照仿真数据作为训练样本，即可实现对后续场分布进行精准预测，均方根误差不超过8%。实验数据表明，有限元仿真用时25 h 15 min,基于科学机器学习的数字孪生模型构建时间仅需665.97 s,且数字孪生模型针对单一时间帧的多物理场推断时间仅需0.6 s。

关键词： 带式输送机   PLC控制器   变频器   故障率  

摘要： 针对矿井恶劣工况下矿用带式输送机频繁出现的停机、空载等问题，本文设计了基于PLC控制器和变频器的集控系统。该系统采用电机软启动技术，并构建了实时通信监控网络，显著降低了设备故障率，为矿山生产效益的提升提供了可靠保障。

关键词： 植被斑图   荒漠化   稳健性   最优控制   稀疏控制  

摘要： 建立了一类具有交叉扩散的植被-水反应扩散模型，将人类活动作为控制函数，研究了该植被模型的稀疏最优控制问题，从控制相关的植被斑图形成的角度揭示了如何通过人类活动提高生态系统的稳健性。给出了模型产生图灵斑图的条件，推导了一阶必要最优条件。最后通过数值模拟，从控制效果、控制误差和控制成本3方面验证了该控制方法的合理性以及控制策略的有效性。

关键词： 冷却塔风机   变频器   永磁同步直驱电机   节能降耗  

摘要： 通过把5 000t/d水泥生产线配套9MW余热发电的冷却塔风机，原来是由电机通过6m长的传动轴带动减速机驱动风机风叶转动，生产中减速机、电机震动大，塔体晃动，减速机机械密封经常损坏；在环境温度低的冬秋季节，单台冷却风机满足不了循环水系统的冷却，两台并列运行又造成过冷却。因此技改成变频永磁电机传动方式，在永磁电机电源控制柜内安装ABB变频器，实现永磁变频调节。技改后，在环境温度低的冬秋季，通过对变频永磁电机降频运行，节电可达62%～67%，其他季节，节电率 为 13%～35%，冷却塔晃动明显减小，同时设备检维修成本大大降低。