多路输出串联谐振变换器交叉调整率研究
发布时间：2019-03-05 20:37
【摘要】：随着当前电力电子设备向着小型化轻量化的方向发展,尤其是消费类电子产品及计算机的发展,更多的设备需要同时有不同等级的电压提供能量,而传统的采用多电源模块供电的方式却不能满足电子设备对小型化轻量化的发展要求,所以多路输出电源技术就成为了重要的发展趋势,它不仅能够有效的减小变换器的体积,在功耗上相对于采用多个单独电源模块供电也有很大的优势。但是多路输出电源在实际应用中仍存在许多问题,其中一个很重要的问题就是多路输出变换器的各路输出很难实现稳压,各路输出电压会随着其中一路负载的变化而变化,即多路输出变换器的交叉调整率问题。针对此问题,本文给出了一种新的解决多路输出变换器交叉调整率的方法。本文首先介绍了多路输出变换器在常见的三相功率模块中的应用,进而介绍了传统的多路输出方式与采用多绕组变压器实现的多路输出方式的原理及其优缺点,之后阐述了多路输出变换器的交叉调整率问题,并详细回顾了现有的调整多路输出变换器交叉调整率的方法及其各自的利弊。由于本实验将以串联谐振变换器为实验平台,所以文章对谐振变换器做了简单介绍,并对串联谐振变换器的工作原理做了详细分析。文章的创新部分是对于变压器加磁栅以及在输出电路加补偿电容的设计,文章首先从原理上对新的改善多路输出变换器交叉调整率的方法做了介绍,由于多路输出变换器存在交叉调整率的主要原因是由于多绕组变压器各绕组间存在漏感,并且漏感间还存在相互耦合,所以文章首先从对磁性元件设计的角度对多绕变压器在结构上进行优化,提出通过在变压器各绕组间加磁栅来抑制变压器各绕组间的耦合,其基本原理是涡流去磁效应,由于在交流场中,磁栅中会产生涡流,而涡流会产生一个与原磁场反向的磁场,从而消除各绕组间漏感的耦合,将各绕组进行相互隔离。在抑制了变压器各绕组的漏感相互耦合的基础上,从电路的角度通过加补偿电容消除等效串联在输出绕组的漏感,由于变压器的漏感可等效为串联在其输出端的电感,所以根据谐振的原理,通过增加串联电容,使之与漏感发生谐振从而阻抗为零,最终消除漏感对输出的影响。文章从涡流去磁的解析算法及有限元仿真的角度对上述的过程进行详细的分析。最后文章通过一个四路输出串联谐振变换器为实验平台对多路输出变换器的交叉调整率问题进行了实验验证及分析。
[Abstract]:With the current development of power electronic equipment towards miniaturization, especially the development of consumer electronic products and computers, more and more devices need to have different levels of voltage to provide energy at the same time. However, the traditional mode of power supply by multi-power module can not meet the requirement of miniaturization of electronic equipment, so the technology of multi-output power supply has become an important development trend, which can not only reduce the volume of converter effectively, but also reduce the volume of converter effectively, so the technology of multi-output power supply has become an important trend. In terms of power consumption, there are also great advantages over using multiple individual power supply modules. However, there are still many problems in the practical application of multi-output power supply. One of the important problems is that the output of multi-output converter is very difficult to achieve voltage stabilization, and the output voltage of each channel will change with the change of one load. That is, the problem of cross-regulation of multi-channel output converter. In order to solve this problem, a new method to solve the cross-regulation rate of multi-channel output converter is presented in this paper. This paper first introduces the application of multi-channel output converter in common three-phase power module, and then introduces the principle, advantages and disadvantages of traditional multi-channel output mode and multi-channel output mode realized by multi-winding transformer. Then the problem of cross-regulation rate of multi-output converter is described and the existing methods of adjusting cross-regulation ratio of multi-output converter are reviewed in detail as well as their advantages and disadvantages. Because the series resonant converter will be used as the experimental platform in this paper, the resonant converter is briefly introduced, and the working principle of the series resonant converter is analyzed in detail. The innovation part of this paper is the design of transformer magnetic gate and compensation capacitor in the output circuit. Firstly, this paper introduces the new method to improve the cross-regulation rate of multi-output converter in principle. The main reason for the cross-regulation of multi-channel output converter is the leakage inductance between the windings of the multi-winding transformer and the coupling between the leakage sensors. Therefore, the paper firstly optimizes the structure of multi-winding transformer from the point of view of magnetic element design, and puts forward that the coupling of each winding of transformer can be suppressed by adding magnetic grid between the windings of transformer, the basic principle of which is eddy current demagnetization effect. In AC field, the eddy current will be generated in the magnetic grid, and the eddy current will produce a magnetic field opposite to the original magnetic field, thus eliminating the coupling of leakage inductance between the windings and isolating the windings from each other. On the basis of suppressing the coupling of leakage inductance of each winding of transformer, the leakage inductance of equivalent series in output winding is eliminated by adding compensation capacitance from the angle of circuit, because the leakage inductance of transformer can be equivalent to the inductance of series at its output end. So according to the principle of resonance, by adding the series capacitance to make it resonate with the leakage inductance, the impedance is zero, finally, the influence of leakage inductance on the output is eliminated. In this paper, the above-mentioned process is analyzed in detail from the angle of analytical algorithm and finite element simulation of eddy current demagnetization. Finally, a four-channel series resonant converter is used as an experimental platform to verify and analyze the cross-regulation of the multi-output converter.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
本文编号：2435265
[Abstract]:With the current development of power electronic equipment towards miniaturization, especially the development of consumer electronic products and computers, more and more devices need to have different levels of voltage to provide energy at the same time. However, the traditional mode of power supply by multi-power module can not meet the requirement of miniaturization of electronic equipment, so the technology of multi-output power supply has become an important development trend, which can not only reduce the volume of converter effectively, but also reduce the volume of converter effectively, so the technology of multi-output power supply has become an important trend. In terms of power consumption, there are also great advantages over using multiple individual power supply modules. However, there are still many problems in the practical application of multi-output power supply. One of the important problems is that the output of multi-output converter is very difficult to achieve voltage stabilization, and the output voltage of each channel will change with the change of one load. That is, the problem of cross-regulation of multi-channel output converter. In order to solve this problem, a new method to solve the cross-regulation rate of multi-channel output converter is presented in this paper. This paper first introduces the application of multi-channel output converter in common three-phase power module, and then introduces the principle, advantages and disadvantages of traditional multi-channel output mode and multi-channel output mode realized by multi-winding transformer. Then the problem of cross-regulation rate of multi-output converter is described and the existing methods of adjusting cross-regulation ratio of multi-output converter are reviewed in detail as well as their advantages and disadvantages. Because the series resonant converter will be used as the experimental platform in this paper, the resonant converter is briefly introduced, and the working principle of the series resonant converter is analyzed in detail. The innovation part of this paper is the design of transformer magnetic gate and compensation capacitor in the output circuit. Firstly, this paper introduces the new method to improve the cross-regulation rate of multi-output converter in principle. The main reason for the cross-regulation of multi-channel output converter is the leakage inductance between the windings of the multi-winding transformer and the coupling between the leakage sensors. Therefore, the paper firstly optimizes the structure of multi-winding transformer from the point of view of magnetic element design, and puts forward that the coupling of each winding of transformer can be suppressed by adding magnetic grid between the windings of transformer, the basic principle of which is eddy current demagnetization effect. In AC field, the eddy current will be generated in the magnetic grid, and the eddy current will produce a magnetic field opposite to the original magnetic field, thus eliminating the coupling of leakage inductance between the windings and isolating the windings from each other. On the basis of suppressing the coupling of leakage inductance of each winding of transformer, the leakage inductance of equivalent series in output winding is eliminated by adding compensation capacitance from the angle of circuit, because the leakage inductance of transformer can be equivalent to the inductance of series at its output end. So according to the principle of resonance, by adding the series capacitance to make it resonate with the leakage inductance, the impedance is zero, finally, the influence of leakage inductance on the output is eliminated. In this paper, the above-mentioned process is analyzed in detail from the angle of analytical algorithm and finite element simulation of eddy current demagnetization. Finally, a four-channel series resonant converter is used as an experimental platform to verify and analyze the cross-regulation of the multi-output converter.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
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