MOSFET非线性寄生电容对单管谐振正激变换器的影响及其处理
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作者单位:

1.福州大学电气工程与自动化学院;2.东南大学先进电能变换技术与装备研究所

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


The Influence of MOSFET's Nonlinear Parasitic Capacitance on Single-Switch Resonant Forward Converter and Its Treatment
Author:
Affiliation:

1.College of Electrical Engineering Automation, Fuzhou University;2.Center for Advanced Power-conversion Technology and Equipment, Southeast University

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    高效的正激变换器常利用高频谐振实现磁复位及软开关。高频下,MOSFET非线性寄生电容对谐振的影响会更加明显,不仅会导致谐振点偏移,软开关失效,更可能令磁芯无法正常谐振复位。为计算在非线性寄生电容影响下的谐振参数,利用Simplis搭建仿真模型,并推导基本数学表达式;利用分段线性法计算谐振过程中电容的充放电时间,并根据能量守恒建立谐振参数取值的约束方程组。计算所得的谐振参数不仅可以在不降低频率和占空比的条件下克服MOSFET非线性电容的影响,当激磁电感取其上限值时,磁损最小,此时可得最高效率。

    Abstract:

    A high-efficiency forward converters often use high-frequency resonance to achieve magnetic reset and soft switching. At high fre-quencies, the non-linear parasitic capacitance of the MOSFET will have a more obvious impact on the resonance, which will not only cause resonance point shift, soft switching failure, but also make the magnetic core unable to resonate normally. In order to calculate the resonance parameters under the influence of nonlinear parasitic capacitance, Simplis is used to build a simulation model, and the basic mathematical expressions are derived; the piecewise linear method is used to calculate the capacitor charging and discharging time during the resonance process, and the resonance parameter value is established according to the conservation of energy Constraint equations. The calculated resonance parameters can not only overcome the influence of MOSFET's nonlinear capacitance without reducing the frequency and duty cycle. When the magnetizing inductance is set to its upper limit, the magnetic loss is the smallest, and the highest efficiency can be obtained at this time.

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  • 收稿日期:2021-09-22
  • 最后修改日期:2021-11-07
  • 录用日期:2021-11-25
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