偏磁

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

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 .

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

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

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

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

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 .

一种新型的SPWM逆变电源抗偏磁方法

A Novel Method of Anti-biasing in SPWM Inverters

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 .

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 .

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 .

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 .

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 .

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 .

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

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 .

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 .

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

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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

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

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

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

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