基于磁饱和特性的反激式电源带载能力评估
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Load-carrying Capacity Evaluation of Flyback Switching Power Supply Based on Magnetic Saturation
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    摘要:

    为了准确评估反激式开关电源的带载能力,以电源所用的高频变压器在运行温度的全范围内不出现磁芯饱和为前提,提出了一种反激式开关电源带载能力评估方法。该方法从判断电源在相应工作电压和负载条件下的工作模式出发,结合高频变压器原边最大工作电流推导并计算电源最大输出功率。在最大输出功率范围内,对某一实际带载功率下的原边电流峰值进行理论计算,根据高频变压器在最高运行温度下允许的最大工作磁密确定原边基准电流,与计算得到的原边电流峰值进行对比,实现对开关电源带载功率合理性的评估。同时采用理论计算和联合仿真的方法得到了不同效率下的原边电流峰值、开关电源的最佳带载功率,以及实际带载能力评估结果,理论计算与联合仿真结果非常吻合。此外,建立了开关电源带载能力测试平台,实验测试结果表明理论计算和联合仿真得到的带载评估结果与实验测试的结果基本一致,验证了该评估方法的正确性。

    Abstract:

    To accurately evaluate the load-carrying capacity of a flyback switching power supply, under the premise that core saturation will not exist in the whole range of operating temperature of a high-frequency transformer used by power supply, an evaluation method for the load-carrying capacity of the flyback switching power supply is proposed. Starting from judging the working mode of power supply under the corresponding working voltage and load conditions, the maximum output power from the power supply is derived and calculated by combining the maximum working current on the primary-side of the high-frequency transformer. In the range of maximum output power, the primary-side peak current under one certain actual load-carrying power is calculated theoretically. According to the maximum working magnetic density of the high-frequency transformer under the highest operating temperature, the primary-side reference current is determined, which is further compared with the primary-side peak current to realize the evaluation on the rationality of load-carrying power of the switching power supply. At the same time, by using the method of theoretical calculation and joint simulation, the primary-side peak current, optimal load-carrying power of switching power supply and evaluation results of actual load-carrying capacity are obtained, and it is found that the theoretical calculations are in good agreement with the joint simulation results. In addition, a test platform for the load-carrying capacity of a switching power supply was established, and experimental results showed that the load-carrying capacity evaluation results obtained using the theoretical calculation and joint simulation were basically consistent with the test results, which verified the proposed evaluation method.

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夏永洪,顾伟华,朱德省,黄嘉雯,朱佳伟.基于磁饱和特性的反激式电源带载能力评估[J].电源学报,2021,19(1):30-38

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  • 收稿日期:2019-01-09
  • 最后修改日期:2020-11-13
  • 录用日期:2019-06-14
  • 在线发布日期: 2021-01-21