正-反激变换拓扑的功率传输分配特性及设计考虑

doi:10.19595/j.cnki.1000-6753.tces.221472

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Abstract Aiming at the problem that the unidirectional magnetization of the basic forward conversion topology will lead to the saturation of the transformer, a variety of magnetic reset measures have been proposed. Among them, the primary side magnetic reset can only consume the excitation energy on the resistance or feed back to the input side, so that the excitation energy can not be fully utilized, therefore, it is not beneficial to improving the energy transmission efficiency of the converter. The secondary-side reset forward-flyback conversion topology composed of four diodes on secondary side can not only transfer forward energy, but also transfer excitation energy to the load, thereby, the energy efficiency can be effectively improved. However, the excitation inductor and the forward inductor can affect the power transmission and distribution characteristics and the switch current stress of the conversion topology. Therefore, the relationship between the power transmission characteristics, switch current stress and the magnetic components parameters is deeply studied in this paper, and through comprehensively considering the influence of forward and flyback transmission power ratio on the electrical performance of the conversion topology, the design method of magnetic components parameters is proposed.
For the forward-flyback converter, the forward inductor can only work in DCM. Comparing the minimum excitation inductor current in one cycle with zero, its working mode can be divided into Magnetizing current Continuous Conduction Mode (MCCM) and Magnetizing current Discontinuous Conduction Mode (MDCM). Through analyzing its power transmission characteristics and its relationship with load resistance R_L under different modes, it is obtained that both the forward power P_FW and flyback power P_FB increases with the decrease of the R_L when the conversion topology works in the MDCM. When the R_L is reduced to make the conversion topology enter the MCCM, the P_FW increases to the maximum value, and no longer increases with the decrease of the R_L, while the P_FB still increases with the decrease of the R_L.
Through analyzing the influence of excitation inductance on the power transmission and distribution characteristics of the conversion topology, the critical excitation inductance L_mc corresponding to P_FW=P_FB is defined, and it is obtained that for the given output power, with the increase of excitation inductance, the P_FW increases and the P_FB decreases, and when the excitation inductor equals L_mc and the conversion topology works in MDCM, the P_FW is equal to P_FB. Through analyzing the influence of the transformer turn ratio on the transmission power ratio of the conversion topology, it is concluded that for the given output power, with the increase of the transformer turn ratio, the P_FB increases and the P_FW decreases.
Through analyzing the influence of power transmission distribution on the switch current stress, it is concluded that for the given output power, the switch current stress decreases with the decrease of P_FW, therefore, reducing the P_FW is beneficial to reducing the switch current stress. However, reducing the P_FW will result in the increase of the P_FB, while increasing the P_FB requires increasing the transformer air gap to reduce the magnetizing inductance, which will result in the increase of the transformer loss. Therefore, reducing the P_FW is not beneficial to improving the efficiency of the conversion topology.
Through analyzing the influence of the distribution of P_FW and P_FB on the electrical performance of the conversion topology, it is obtained that reducing the P_FW is beneficial to reducing the current stress of the switch, while reducing the P_FB is beneficial to improving the efficiency of the conversion topology. Therefore, in order to improve the efficiency of the conversion topology and not cause the current stress of the switch to be too high, a component parameter design method is proposed to guarantee that P_FW=P_FB when the output power reaches the maximum within the given load range.
Experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed design method. The proposed components parameters design method of the forward-flyback conversion topology in this paper is helpful to the development of high-performance forward-flyback conversion topology and promote its popularization and application.

Key words： Forward-flyback conversion topology power transmission distribution forward power flyback power design

Received: 30 July 2022

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TM46

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	Liu Shulin
	Shen Yijun
	Liu Xu
	Tuo Hanyu
	Wang Cheng
	Wang Wenqiang
	Wu Xing

Cite this article:

Liu Shulin,Shen Yijun,Liu Xu等. Power Transmission Distribution Characteristics and Design Considerations of Forward-Flyback Conversion Topology[J]. Transactions of China Electrotechnical Society, 0, (): 64-64.

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