共查询到19条相似文献,搜索用时 46 毫秒
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提出一种改进的无源钳位的全桥移相ZVZCS PWM DC-DC变换器,并对此变换器的工作原理和软开关实现条件进行详细的分析。该电路具有软开关负载范围大、辅助谐振元件的附加损耗小、电压电流应力小等优点。 相似文献
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针对开关电源开关损耗和电磁辐射的问题,建立了一种采用软开关技术的零电压开关(ZVS)PWM变换器的电路,利用PSpice软件对这种变换器进行仿真研究,分析其暂态和稳态时的性能。仿真表明,合理选择器件参数,当软开关变换器电路中L1=0.3mH,L2=3μH,C1=500p时,开关损耗小,造成的电磁干扰小。仿真发现暂态时开关器件承受了较高的电压应力,实际应用时应考虑开关器件安全性。 相似文献
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开关功率变换器中的混沌现象研究 总被引:1,自引:0,他引:1
本文对开关功率变换器中的混沌现象进行了探讨,并在电路实验和计算机模拟两个方面证明了开关功率变换器不仅在PWM闭环控制下会出现混沌现象,而且在开环工作情况下,由于功率晶体管极间电容的非线性等因素的影响,功率变换器也可能出现混沌。 相似文献
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本文提出了一种新的建立开关变换器分析模型的方法,命名为开关函数平均法。与已有的分析方法相比,该方法推导简单,精度高,可适合于各种不同的开关变换器,并可方便地建立小信号和大信号拢动的统一模型。 相似文献
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《中国新技术新产品》2016,(12)
开关电源包含各种各样的学科,其中,电力以及微电子属于主要部分,此外电磁学以及热力学等也与开关电源息息相关。本次研究针对智能大功率软开关电源进行分析以及深入研究,针对新型高频软开关通信电源电路进行设计,希望能够为促进新型开关通讯电源的设计提供科学的参考依据。 相似文献
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Sung-Pei Yang 《中国工程学刊》2013,36(4):488-501
The non-floating switches, zero-current–zero-voltage-transition (ZCZVT) soft-switching DC/DC boost power converter is proposed in this article. The AC small-signal mathematical model for the ZCZVT boost converter is then derived. It shows that the ZCZVT boost converter exhibits better dynamical behavior than the conventional PWM boost converter. The accuracy of theoretical results is verified by experiments and simulations. In addition, a classical and a modified integral variable structure controllers are designed to achieve output voltage regulation. They are used to eliminate the effect of the variations of input voltage and load on the output voltage. The performances of the proposed converter with these controllers are also validated by experimental results. 相似文献
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简要介绍了目前凹印机的张力控制系统的方案及存在的问题.并对现有的张力控制方案提出了几点改进设想.以期达到提高效率和节约成本的目的. 相似文献
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A block diagram and a mathematical model of a measuring power converter of high accuracy and speed of response are considered. Relations for estimating the conversion error and the gain in accuracy are presented. The proposed block diagram and the model enable high-speed power converters for multichannel systems to be developed using typical components with a conversion error not greater than tenths of a percent in the audio-frequency band. 相似文献
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文章介绍了本钢150t转炉倾动装置采用交流变频调速驱动的应用并对电机的选择、变频器的选择、控制方案的确定作了详细说明.采用PROFIBUS-DP网组成控制网络,对系统实行网络控制;用SIMOLIK光纤网解决了同步控制的问题. 相似文献
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本文详细回顾了感光化学新兴的研究领域“空穴-电子化学转化器”的研究历史,介绍了目前在该研究领域的研究状况,展望未来的研究前景。 相似文献
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陈明 《制冷与空调(四川)》2004,18(3):40-42
随着我国目前电力供应的紧张和电价的上调,变频空调以其舒适节能成为市场销售的新亮点.本文通过变频空调的基本原理、使用效果及未来发展趋势来引导消费者正确地加以选择. 相似文献
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A vector control scheme is presented for a three-phase AC/DC converter with bi-directional power flow capability. A design
procedure for selection of control parameters is discussed. A simple algorithm for unit-vector generation is presented. Starting
current transients are studied with particular emphasis on high-power applications, where the line-side inductance is low.
A starting procedure is presented to limit the transients. Simulation and experimental results are also presented. 相似文献
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It is shown that the transfer into a recording instrument of a measured volume flow rate of low-viscosity liquids in the form of a PWM-signal, and also software and hardware for carrying out the functions of monitoring and self-diagnostics and for eliminating the random component of the errors and subregulation using external crossing components in combination with the use of the M1821BM85A microprocessor, ensures the functional reliability of the monitoring and measuring system, thereby satisfying the requirements for their use in industrial and transport systems. 相似文献