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IGBT集成驱动保护模块的分析、比较与选用 总被引:3,自引:0,他引:3
本文简要分析了IGBT的工作原理,详细分析了多种IGBT驱动模块的特点,并进行了比较:对目前较为流行的电力电子器件IGBT的使用及其驱动模块的选择有着一定的参考价值。 相似文献
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根据逆变CO2焊机IGBT的工作特点,分析了逆变CO2焊机IGBT的驱动要求,设计了一套由分离元件构成的逆变CO2焊机IGBT驱动电路.由DSP产生的两路PWM信号首先经分频电路进行分频,再经电气隔离与电压调整电路进行信号调理,最后经变压器隔离放大电路进行电气隔离和电压调整放大,最终可获得逆变焊机IGBT安全可靠工作的PWM驱动信号.根据设计,制作了全套驱动电路,采用20 kHz工作频率进行试验.试验结果表明,获得的IGBT驱动信号的栅极正负偏压、栅极电压上升时间以及信号同步性和抗干扰性均符合设计要求,能够安全可靠地驱动逆变CO2焊机IGBT工作. 相似文献
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重点分析了IGBT孤焊逆变器的驱动电路和保护电路。以及IGBT驱动模块和应用。 相似文献
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IGBT驱动电路研究 总被引:1,自引:0,他引:1
在焊接生产过程中,逆变焊接以较高的生产效率和稳定的焊接质量得到了广泛应用.IGBT因其电压控制、输入阻抗高、驱动功率小、控制电路简单、开关损耗小、通断速度快和工作频率高成为逆变焊接的关键器件.其中IGBT驱动电路是IGBT应用中的重要环节,驱动电路设计的优劣直接关系到由IGBT构成的系统长期运行的可靠性.介绍了构成IG... 相似文献
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弧焊逆变器中IGBT管的保护分析 总被引:2,自引:0,他引:2
本文全面分析了功率开关管在全桥式弧焊逆变器电路中的工作情况,对于工作周期中可能出现的电压、电流峰值等区段的情况作了讨论;结合逆变主电路和IGBT管参数特性,对IGBT管在弧焊逆变器中的使用和保护作了分析,强调了使用时驱动电路的重要作用。最后,以实际使用的IGBT模块的参数表、参数曲线为例,进行参数的具体说明和分析。 相似文献
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多元光谱拟合ICP-AES法同时测定铂中22个杂质元素 总被引:1,自引:0,他引:1
试样用HCl-HNO3溶解,采用多元光谱拟合(MSF)功能ICP-AES法同时测定铂中22个杂质元素:Pd、Rh、Ir、Ru、Au、Ag、Cu、Fe、Zn、Ni、Mn、Cr、Mg、Cd、Al、Ca、Pb、Sn、Bi、Si、Mo、Ti。对基体铂的影响、MSF功能、元素分析谱线、背景校正、仪器分析参数等进行了研究,确定了最佳实验条件。杂质元素测定范围Ag、Pd、Cu、Cr、Ti、Mn和Mo为0.0004%~0.05%;Rh、Ir、Pb、Fe、Mg、Al、Zn、Si、Bi、Ca、Cd、Sn、Au和Ni为0.0005%~0.05%;Ru为0.001%~0.05%;方法的相对标准偏差(RSD)和加标回收率分别为1.5%~8.1%和85.1%~118.5%。方法准确、快速、简便,已用于铂中杂质元素的分析。 相似文献
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The isothermal section of Fe-Ni-Zr ternary system at 1198K was experimentally determined using diffusion triple technique together with scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The results indicate that there are seven binary intermetallic phases, Fe2Zr, FeZr2, NiZr2, NiZr, Ni10Zr7, Ni7Zr2, and Ni5Zr, found in the ternary system, the binary compounds NiZr2 and FeZr2 show a homogeneity range and form a continuous solid solution, namely (Fe, Ni)Zr2. Five three-phase sections, γ(Fe,Ni) Ni7Zr2 Ni5Zr, γ(Fe,Ni) Ni7Zr2 Ni10Zr7, γ(Fe,Ni) Fe2Zr Ni10Zr7, (Fe,Ni)Zr2 Fe2Zr Ni10Zr7, and (Fe,Ni)Zr2 NiZr Ni10Zr7, exist in the isothermal section. No ternary compound is observed. 相似文献
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目的: 探讨亚甲基四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR),谷胱甘肽S转移酶P1(glutathione S-transferase pi-1,GSTP1),核苷酸切除修复交叉互补组-1(excision repair cross-complementing group 1,ERCC1)基因多态性与结直肠癌5-氟尿嘧啶/奥沙利铂/亚叶酸钙(FOLFOX)化疗方案疗效的相关性。方法: 150例晚期大肠癌患者抽取静脉血并提取DNA,用荧光定量PCR和高分辨率溶解曲线分型技术(HRM-SNP)等方法检测患者MTHFR、GSTP1、ERCC1基因型。所有患者均经FOLFOX方案治疗,以实体瘤化疗疗效评价标准(RECIST1.1) 评价疗效。运用SPSS 19.0 结合临床资料进行统计分析。结果: ⑴患者性别,年龄,结直肠癌分期(TNM),肿块部位等和FOLFOX化疗疗效均无明显相关性(P>0.05)。⑵GSTP1 Ile105Val Ile/Ile和Ile/Val+Val/Val有效率分别为19.7%、20.5%,两组基因型之间的OR值为 2.876,95%CI(1.288,6.424),P<0.05;MTHFR Ala222 Val Ala/Ala和Ala/Val+Val/Val有效率分别为 11.8%、28.3%,OR值为 2.236,95%CI(1.020,5.017),P<0.05。结论: GSTP1 Ile105Val 、MTHFR Ala222 Val单核苷酸多态性与结直肠癌对FOLFOX方案化疗疗效相关,检测GSTP1 Ile105Val、MTHFR Ala222Val单核苷酸多态性可能成为预测结直肠癌患者接受FOLFOX方案化疗疗效的指标。 相似文献
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The principle of the stretch reducing process is analyzed and three models of pass design areestablished. The simulations are done about variables, such as, stress, strain, the stretches betweenthe stands, the size parameters of the steel tube, and the roll force parameters. According to itsproduct catalogs the system can automatically divide the pass series, formulate the rolling table,and simulate the basic technological parameters in the stretch reducing process. All modules areintegrated based on the developing environment of VB6. The system can draw simulation curvesand pass pictures. Three kinds of database including the material database, pass design database,and product database are devised using Microsoft Access, which can be directly edited, corrected,and searched. 相似文献
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Narjes Ebrahimi Sara Rasoul-Amini Alireza Ebrahiminezhad Younes Ghasemi Ahmad Gholami Hassan Seradj 《金属学报(英文版)》2016,29(4):326-334
Magnetic-silver nanostructures were synthesized via optimized chemical conditions, and their characteristics and cytotoxicity were compared as candidates for the magnetic delivery of silver nanoparticles toward cancer cells.Magnetic-silver nanostructures were prepared through the reduction of silver ions in the presence of iron oxide nanoparticles using three different reducing agents(glucose, maltose and sodium citrate). Their physicochemical characteristics were determined using ultraviolet–visible spectroscopy, X-ray diffraction analysis, transmission electron microscopy, selected area electron diffraction analysis, Fourier transformed infrared spectroscopy, atomic absorption spectroscopy, vibrating sample magnetometry and differential scanning calorimetry. Cytotoxic activities were evaluated against a human liver hepatocellular carcinoma cell line. Fabricated nanostructures, which exhibit differences in size, silver content, magnetic saturation value and cytotoxicity, represent sufficient superparamagnetic properties and considerable cytotoxicity to be suggested as effective tools in magnetic targeting of silver nanoparticles as an approach to cancer therapy. 相似文献
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Z. Sun S.L. Zheng Y. Zhang 《金属学报(英文版)》2007,20(3):187-192
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. 相似文献
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目的: 观察多囊卵巢综合征(PCOS) 模型大鼠血清性激素 T 、FSH 、LH 及瘦素(Leptin) 水平的变化, 探讨复方中药对 PCOS 模型大鼠生殖内分泌系统的影响。方法: 本实验采用 Poresky 法进行造模, 并分别以中药、西药(罗格列酮)、中西药联合用药治疗, 观察治疗后大鼠体重 、血清性激素及Leptin 水平的变化, 并进行 Leptin 水平与 FSH、LH 、LH/FSH 、T 、WEIGHT 的相关分析 。结果: 复方中药能降低血清 T 、LH 、Leptin 水平及 LH/FSH 比值, 且血清 Leptin 水平与 LH 、T 呈正相关。结论:复方中药能改善 PCOS 模型大鼠的生殖内分泌功能, 降低血清 Leptin 水平。 相似文献
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讲述了电焊机使用中应注意的事项,介绍了交流弧焊机的特点和弧焊变压器的分类。从交流弧焊机的安装地点及环境,动力线、开关、熔断器和焊接电缆的选择等方面详述了焊机的正确安装是保证焊机正常使用、保证安全及节约能源的重要条件。 相似文献