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 The unidirectional magnetization of the basic forward conversion topology will lead to the transformer’s saturation, and various magnetic reset measures have been proposed. Among them, the primary side magnetic reset only consumes the excitation energy on the resistance or feedback to the input side, so the excitation energy can not be fully utilized. Therefore, it is not beneficial to improve energy transmission efficiency of the converter. The secondary-side reset forward-flyback conversion topology composed of four diodes on the secondary side can forward energy and excitation energy to the load, thus improving the energy efficiency. However, the excitation inductor and the forward inductor affect the power transmission and distribution characteristics and the switch current stress of the conversion topology. Therefore, this paper studies the relationship between power transmission characteristics, switch current stress and the magnetic components parameters. The design method of magnetic components parameters is proposed by comprehensively considering the influence of forward and flyback transmission power ratio on the electrical performance of the conversion topology.
For the forward-flyback converter, the forward inductor can only work in DCM. Compared with 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). Its power transmission characteristics and its relationship with a load resistance R_L under different modes show that both the forward power P_FW and flyback power P_FB increase 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.
The critical excitation inductance L_mc corresponding to P_FW=P_FB is defined by analyzing the influence of excitation inductance on the power transmission and distribution characteristics of the conversion topology. For the given output power, the P_FW increases, and the P_FB decreases with the increase of excitation inductance. When the excitation inductor equals L_mc, and the conversion topology works in MDCM, the P_FW equals P_FB. The P_FB increases, and the P_FW decreases with the increase of the transformer turn ratio.
Regarding the influence of power transmission distribution on the switch current stress, for the given output power, the switch current stress decreases with the decrease of P_FW. Therefore, reducing the P_FW can reduce the switch current stress. However, reducing the P_FW will increase the P_FB, while increasing the P_FB requires increasing the transformer air gap to reduce the magnetizing inductance, which will increase the transformer loss. Therefore, reducing the P_FW is not beneficial to improving the efficiency of the conversion topology.
Regarding the influence of the distribution of P_FW and P_FB on the electrical performance of the conversion topology, reducing the P_FW is beneficial to reducing the current stress of the switch, and reducing the P_FB can improve the efficiency of the conversion topology. Therefore, 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 design method for component parameters can develop a 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, 2023, 38(18): 5006-5016.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221472 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I18/5006

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