Switching power supply is widely used in industrial equipment, household appliances, and other fields due to the advantages of high integration and lightweight. Voltage sags can seriously affect the output voltage of switching power supply and the working condition of its power supply equipment; at the same time, the working scenarios of power equipment using switching power supply often have different level of harmonic problems. Considering the continuous innovation of switching power supply technology, the previous analysis and test results on the effect of voltage sags and harmonics on switching power supplies may no longer be applicable. The paper reveals the mechanism of the effect of harmonic alone as well as voltage sag superimposed harmonics on the output voltage of the switching power supply. Then the test research program was developed, and four different brands switching power supplies were selected for the test research, with which the effects of different amplitude voltage sags, harmonics with different frequencies and distortion, as well as voltage sag superimposed harmonics on the output voltage of switching power supplies were investigated. The results show that the tolerance ability of switching power supplies to voltage sags has been improved compared with previous switching power supplies, and the harmonic itself has less effect on the output voltage of switching power supply, but the joint action of harmonics and voltage sags will have a greater effect on the output voltage of switching power supply. © 2024 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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电压暂降和谐波对开关电源输出特性影响的研究

开关电源凭借高集成度、轻量化等优点，广泛应用于工业设备、家用电器等领域。电压暂降会严重影响开关电源的输出电压及其供电设备的工作状况；同时，采用开关电源的电力设备的工作场景往往存在不同程度的谐波问题。考虑到开关电源技术的不断创新，以往关于电压暂降和谐波对开关电源影响的分析和测试结果可能不再适用。论文揭示了单独谐波以及电压暂降叠加谐波对开关电源输出电压的影响机理。然后制定了测试研究方案，选取了四种不同品牌的开关电源进行测试研究，研究不同幅值电压暂降、不同频率和畸变率的谐波以及电压暂降叠加谐波对输出电压的影响。开关电源的研究。结果表明，开关电源对电压暂降的耐受能力较以往的开关电源有所提​​高，且谐波本身对开关电源输出电压的影响较小，但谐波与电压暂降的共同作用将导致开关电源的输出电压下降。对开关电源的输出电压影响较大。 © 2024 日本电气工程师协会。由 Wiley 期刊有限责任公司出版。