Modeling and analysis of power processing unit based on secondary-side LLC resonant converter
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摘要: 随着航空航天技术的不断发展，航天器对于霍尔电推进功率处理单元（PPU）的需求不断提高，高增益、大功率以及高效的PPU成为研究的主流方向。LLC拓扑能够在全负载范围内实现软开关，因此在PPU阳极电源中具有广阔的应用前景。原边LLC因其原副边增益特性，给阳极电源高增益变换器的谐振电感设计带来极大的挑战。针对上述问题，提出了一种改进的副边LLC谐振拓扑，在保留原边LLC谐振电路软开关特性的同时，有效解决了谐振电感设计问题，使得PPU阳极电源具备高增益的性能。首先利用时域分析法建立了副边LLC拓扑数学模型，其次在模型的基础上给出其峰值增益的计算方法，最后通过一台样机验证了所建模型的正确性并验证了副边LLC电路的有效性。Abstract: With the continuous development of aerospace technology, the demand for Hall-electric propulsion power processing units (PPUs) in spacecraft is constantly increasing, and high-gain, high-power and high-efficiency PPUs have become the mainstream direction of research. The LLC topology enables soft switching over the full load range and therefore offers broad application prospects in PPU anode power supplies. Due to its primary and secondary gain characteristics, the primary LLC brings great challenges to the resonant inductance design of the high gain converter of the anode power supply. In view of the above problems, this paper proposes an improved secondary LLC resonant topology, which retains the soft switching characteristics of the primary LLC resonant circuit while effectively solving the resonant inductor design problem, so that the PPU anode power supply has high gain performance. In this paper, the mathematical model of the secondary LLC topology is first established by using the time domain analysis method, and then the calculation method of the peak gain is given on the basis of the model, and finally the correctness of the built model is verified by a prototype and the validity of the secondary LLC circuit is verified.
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表 1 电路部分参数
Table 1. Main parameters of the circuit
output power
Po/Wresonant frequency
fr/kHzresonant inductance
Lr/μHresonant capacitor
Cr/μFadditional inductance
Lm/μHtransformer
ratio704 91.3 95 0.032 550 1∶8.42 
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