耦合电感倍压解耦磁集成高电压增益变换器

Coupled Inductance Voltage Doubling Decoupling Magnetic Integrated High Voltage Gain Converter

为实现更高的电压增益,提出一种耦合电感倍压解耦磁集成高电压增益变换器。该变换器通过设计耦合电感匝数比和调节占空比来实现高电压增益,采用磁集成磁件设计方案,减少了变换器磁件的体积和数量。该文首先分析变换器器件的应力,给出变换器电压增益与占空比之间的变化关系;然后,利用磁路-电路对偶分析法推导得到耦合电感与输入电感解耦集成磁件的磁路模型,获得了输入电感与耦合电感之间的解耦磁集成设计准则;最后,搭建一台额定功率为300W的实验样机,对所提出的变换器和解耦集成磁件设计理论进行实验验证,验证了理论的正确性。变换器的效率达到93%以上,在光伏发电系统中具有一定的实用性。

In the past 10 years,considerable attention has been paid to the use of green energy.The use of renewable energy gradually increases the demand for converters.The classic boost converter is unable to provide a high voltage gain.At the same time,it increases the voltage stress of converters’components,and the conversion efficiency is dropped.Academic and industry circles have conducted more relevant studies on high-gain converters to satisfy high voltage gain with converter performance.The converters have various voltage boost techniques such as voltage multiplier,switched-capacitor,coupled inductor,etc.Different technologies have advantages and disadvantages.Firstly,the high gain converter is proposed based on the combination of Boost converter and coupling inductor.Then,by combining and simplifying the input side of the Boost converter and the basic stacked coupled inductor boost circuit,a high voltage gain converter topology based on the coupled inductor structure is proposed.The operation mode,voltage gain,voltage stress,current stress and other aspects of the proposed converter are analyzed,and the calculation method of the proposed converter efficiency is given,and the pie chart of quantitative calculation of the loss is given in the experimental measurement.The decoupling magnetic integration design of the proposed converter is given,and a design method to realize the decoupling magnetic integration of the coupled inductor and the independent inductor is presented.The equivalent circuit model of the integrated magnetic component designed is proposed by using the circuit-magnetic circuit analysis method.The simulation analysis of the proposed scheme verifies the rationality of the design method.Through the magnetic component design method proposed,the volume of the integrated magnetic component can be reduced by about 24%compared with that of the discrete magnetic components.Finally,the experimental prototype designed,and the waveform results of the relevant experiments are given.The effect of the current on the magnetic components of the converter before and after the decoupling magnetic integration design scheme is compared,and the efficiency curve of the prototype is given.The input of the designed converter is connected with 24V power supply.After the lifting of the proposed converter the 240V voltage is obtained on the output side at a switching frequency of 50kHz.Adjusting the load to implementation different output power,when the output power is 100W,120W,120W,140W,160W,180W,200W,220W,240W,260W,280W,the corresponding efficiency is 88.4%,89.2%,89.7%,90.1%,90.8%,91.4%,92.1%,93.4%,92.5%,92%.The experimental efficiency in the 240W load condition reaches 93.4%.A coupling inductor voltage doubling decoupling magnetic integrated high voltage gain converter is proposed for the front stage unit of new energy power generation inverter.Through the analysis of the converter mode and the magnetic circuit of the integrated magnetic component,the decoupling integration conditions of the coupling inductance and the input inductance are obtained.A prototype is realized to confirm the validity of the theoretical analysis and the operation of the proposed converter.The converter topology has the following characteristics:(1)The voltage gain of the converter is related to the turn ratio of the coupling inductor.When the turn ratio is 2 and the duty cycle is 0.6,the voltage gain reaches more than 13 times.(2)Under the condition that the converter performance is unchanged,the decoupled magnetic integration is used to reduce the number of magnetic components,and the coupling inductance is made by winding the column in the magnetic core to reduce the leakage inductance.(3)The converter can be cascaded and expanded,so that the converter can be applied to a variety of working situations.