共查询到17条相似文献,搜索用时 46 毫秒
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从分析高频感应加热电源的常见故障来判断,在高频感应加热设备中可能产生故障的部位从根本上予以解决. 相似文献
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感应加热电源中的频率跟踪技术 总被引:9,自引:1,他引:8
分别从锁相环技术和电流过零点同步技术两方面展开了论述,重点阐述了锁相环技术的几种方法.随着数字电子技术的发展,锁相环技术也由传统的CD4046模拟锁相环发展为通过单片机、DSP、FPGA/CPLD实现的数字锁相环'克服了模拟锁相环线路复杂、元件易老化、零点漂移等缺点,从而使频率跟踪技术精度提高、性能更加可靠、稳定性好、抗干扰能力增强.分析了频率跟踪技术的发展趋势. 相似文献
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新型晶闸管感应加热电源换流监控电路 总被引:1,自引:0,他引:1
简述了晶闸管中频感应加热电源的工作原理及换流过程,在分析已有换流监控电路的基础上,提出了一种新的监控电路,并得到了实际验证。 相似文献
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结合实际工程中感应加热电源的工况,设计了一种PWM逆变交流变频预热电源。此电源控制核心为TMS320F2812。采用适于频繁启动场合的串联逆变振荡电路。整个电路系统由滤波电路、AC-DC-AC变频和四个IGBT逆变装置组成。串联逆变过程由IR2132芯片通过PWM信号驱动IGBT等电路来实现。实验证明:本电源设计不仅降低了驱动电路的复杂程度,同时大幅提升了整个系统的可控性和稳定性,显著降低了故障率。 相似文献
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CD4046锁相环在感应加热电源中的应用 总被引:18,自引:3,他引:15
采用了LEM电流传感器、电压比较器和CD4046锁相环对负载电流实现了频率跟踪、使逆器工作在功率接近或等于1的准谐振状态,并分析了电路中的相位补偿和起动问题。 相似文献
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The impact mechanism of environmental factors, such as corrosive atmosphere, on connector materials was investigated, and the porosity of gold plating was tested. Series of inspections and analytical research methods were introduced in this article. The surface morphology of specimens after corrosion was observed by stereoscopic microscope and scanning electron microscope. Chemical constitution was examined by X-ray energy spectrum. The contact resistances were measured by four-point method. The experiment results show that after exposure to certain environment, the corrosion products, such as Cu2O, Cu(NO3)2·3H2O, and NiO, are observed on the surface of the specimens without gold coatings, whereas the corrosion products appear to have circle-shaped spots on gold-plating surface after corrosion test, which indicate that the gold plating has good corrosion protection. The porosity is increased with the increase of corrosion time for every kind of specimens gold plated, and the corrosion degree of goldplating specimens is decreased with the increase of the thickness of gold coatings. The static contact resistances of circle-shaped spots appear higher contact resistance than normal value, which can reach to 2,000 mX nearly. It is found that the high and unstable contact resistance of the pore and products is more likely to cause contact failure. 相似文献
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随着感应热处理技术的不断发展,对感应热处理设备提出越来越高的要求.感应加热电源:可控硅中频电源、IGBT全固态中频、超音频电源、MOSFET全固态高频电源,以及机电一体化技术的出现都为感应热处理的发展打下了坚实基础.本文介绍了新型感应加热电源及自动化、高机械化程度的机床设计开发程序,以及典型的应用实例.为缩短与发达国家在感应热处理设备方面的差距,我国的感应热处理设备正向节能、高效、机械化、自动化发展,已开发出一系列先进的、多品种的机电一体化感应加热成套设备,克服了传统感应热处理设备许多缺陷,满足了大批量生产的要求. 相似文献