偏磁
- bias magnet;bias;magnetic biasing
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SPWM中频电源输出变压器偏磁分析与控制
The analysis and control of magnetic bias for SPWM inverter transformer
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控制电路采用电流型控制芯片UC3846,可以有效地解决推挽拓扑易出现的直流偏磁问题。
Current-type control chip UC3846 is used for the control circuit , which is efficient solution for DC bias magnetic problem in push-pull topology .
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基于DSP的单相逆变器抗直流偏磁技术研究
A Study of DC Anti-magnetic-bias in Single Phase Inverter Based on DSP
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全桥软开关PWM变换器中变压器偏磁机理及抑制方法的研究
Study of Transformer Magnetic Bias and Eliminating Method in Full-Bridge Soft Switching PWM Converter
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交错并联DC/DC变换器中集成磁件无直流偏磁控制策略研究
Research on the Control Strategy of an Integrated Magnetics About Eliminating DC-Bias in Interleaving DC / DC Buck Converter
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UPS电源输出变压器的偏磁分析
The Analysis of Magnet Bias for the Output Transformer in the UPS
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针对逆变变压器中存在的直流偏磁问题,提出了一种数字PI电压积分抗偏磁的控制方式。
A digital PI voltage integral fulx imbalance control is proposed for eliminating fulx imbalance in the interver transformer .
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一种新型的SPWM逆变电源抗偏磁方法
A Novel Method of Anti-biasing in SPWM Inverters
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分析了SPWM开关型变换器中输出变压器产生直流偏磁的机理。
The mechanism of DC biasing for output transformer of SPWM switching converter was analyzed .
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DSP主要完成采样、PI调节和通信等,实现偏磁式消弧线圈励磁电流的数字控制。
The DSP realizes functions of sampling , PI regulation , communication and so on to digitally control the excitation current of arc-suppression coil with magnetic bias .
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针对SPWM全桥逆变器中存在的直流偏磁现象,提出了数字PI电压积分调节方法。
A digital PI voltage integral regulating method , as proposed in the paper is directed at overcoming the flux imbalance phenomena in the SPWM full-bridge inverter .
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用插入损耗法和伏安法得出偏磁状态下的铁氧体磁芯的H~μr和f~μr曲线。
Use the volt - ampere method and measure the insertion loss of the coil inductance to obtain the curves of H ~ μ r and f ~ μ r of ferrite in bias magnetic field .
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针对SPWM全桥逆变电源输出变压器直流偏磁问题,详细分析了直流偏磁对逆变电源的影响,并提出了一种基于DSP的全数字化控制方案。
Based on the analysis of the magnetic bias of output transformer in SPWM full-bridge inverter , a scheme of fully digitized controller based on DSP is proposed in this paper .
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介绍了两种防止PWM全桥逆变电源输出变压器单向偏磁的简易方法,并给出了实用电路,分析了其工作原理。
In this paper , two kinds of simple methods , which are used to restrain the flux imbalance for the output transformer of full bridge single phase inverter circuit , are introduced .
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直流偏磁条件下电力变压器铁心B-H曲线及非对称励磁电流
B-H Curve Based on Core and Asymmetric Magnetizing Current in DC-Biased Transformers
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高压直流(HVDC)输电系统中所采用的换流变压器是三相变压器组,其对直流偏磁十分的反应十分灵敏。
The converter transformer that High-voltage DC ( HVDC ) transmission system adopted in is three-phase transformer group , its response to the DC magnetic bias is very sensitive .
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通过检测变压器原边电压在几个周期内的变化量,利用PI调节器得出的控制量来适时的调整触发脉冲的宽度,把变压器直流偏磁限制在较小的范围之内。
By measuring the change of primary voltage of the transformer in several periods , PI controller adjusts the width of pulse so that flux imbalance of the transformer is limited in a reasonable scope .
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直流偏磁引起的500kV电力变压器振动和噪声的现场测量与分析
Field Monitoring and Analysis on Vibration and Noise of 500 kV Electrical Transformer under DC Current Biasing
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实验表明该系统励磁电流动态响应小于5ms,满足偏磁式消弧线圈的控制要求。
The experiment shows that the dynamic response of excitation current is less than 5 ms , meeting requirements of arc-suppression coil with magnetic bias .
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采用基于UC3846电流型控制芯片,简化了电流保护电路,避免了推挽变换器工作时磁芯偏磁导致的事故发生。
UC3846 of current mode control is used so that circuit for current limited function is removed and flux imbalance that can cause accident is been avoided .
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在一台440V直流输入、5.5kW交流400Hz输出的中频逆变器上进行了系统的实验验证。实验结果表明,该方案对直流偏磁问题抑制的有效性和实用性。
The experimental results on 400 Hz 5.5 kW prototype of inverter are presented to demonstrate the practicability and validity of the control strategy for elimination of magnetic bias .
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采用变压器铁心励磁特性曲线,利用EMTP程序计算出直流偏磁时变压器的励磁电流,当变压器的励磁电流不超过规定值时,认为该直流偏磁对应的直流电流可接受。
Using the exciting curve of core of transformer and EMTP program the exciting current of transformer is calculated . When the exciting current of transformer does not exceed the defined value the dc current corresponding to the dc offset magnet can be accepted .
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制造出6kV,50A的样机并进行了相关实验研究,依据调节特性,可以通过控制偏磁电流精确地调节接地消弧变压器电感。
A sample of 6 kV 50 A is made and relevant tests are carried through . Depending on the adjustment characteristic , the inductance of arc-suppression transformer can be accurately adjusted by controlling the magnetic bias current .
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在对现有抗偏磁措施进行比较的基础上,提出了一种基于UC3879的移相全桥逆变器直流偏磁抑制措施。
After comparison of the conventional methods to eliminate the DC bias , a novel method of eliminating the DC bias in the full bridge inverter based on UC3879 has been proposed .
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逆变电源变压器容易出现直流偏磁问题。
Inverter power supply transformer easily make problem of DC magnetic-bias .
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逆变器中高频变压器偏磁的研究
Study of the High Frequency Transformer Magnetic Bias in the Inverter
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变压器直流偏磁电流阻容抑制装置的开发应用
Development of the DC Current Blocking Device in Capacitor-resistor for Transformer
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太阳能并网逆变电源变压器直流偏磁的抑制
Restraining of DC Bias Transformer Magnetization in Solar Energy Grid Inverter
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推挽电路中变压器偏磁机理及抑制方法的研究
Research on Transformer Magnetic Bias and Eliminating Method in Push-Pull PWM Converter
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大型电力变压器直流偏磁现象的研究
Research on the DC Bias Phenomena of Large Power Transformers