结电容对双向CLLC谐振变换器影响的研究
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摘要
介绍一种基于CLLC拓扑的双向DC/DC谐振变换器,该变换器容易受到谐振腔寄生参数的影响。此处在考虑次级结电容这一寄生参数的情况下,对变换器的工作模态进行分析,并根据变换器等效电路列出次级结电容参与电路工作时各关键波形的表达式,以讨论结电容带来的振荡对电路的危害。使用基波分析法推导考虑结电容影响的变换器增益公式,在此基础上提出变换器的优化设计方案以缓解结电容带来的电路振荡,采用burst-mode控制策略以解决输出电压漂高的问题。最后通过一台3.3 kW的实验样机对上述分析及设计方案进行验证。
A CLLC topology-based bidirectional DC/DC resonant converter is introduced.The converter is easily influenced by the parasitic components in resonant cavity.Operating modal of this converter considering the junction capacitor on the secondary side is analyzed and the expressions of key waveforms when the junction capacitors on the secondary side take part in the circuit working is derived according to the equivalent circuit of the converter to discuss the harm of oscillation taken by the junction capacitor to circuit.The expression of voltage gain of the converter considering effects of junction capacitor is derived by the fundamental wave analysis method and on this basis,the optimal design method of the converter in order to decrease the resonance taken by junction capacitor and the burstmode control strategy are proposed in order to solve the voltage rising problem.To confirm the proposed analysis,the experimental results with a 3.3 kW prototype are presented at last.
A CLLC topology-based bidirectional DC/DC resonant converter is introduced.The converter is easily influenced by the parasitic components in resonant cavity.Operating modal of this converter considering the junction capacitor on the secondary side is analyzed and the expressions of key waveforms when the junction capacitors on the secondary side take part in the circuit working is derived according to the equivalent circuit of the converter to discuss the harm of oscillation taken by the junction capacitor to circuit.The expression of voltage gain of the converter considering effects of junction capacitor is derived by the fundamental wave analysis method and on this basis,the optimal design method of the converter in order to decrease the resonance taken by junction capacitor and the burstmode control strategy are proposed in order to solve the voltage rising problem.To confirm the proposed analysis,the experimental results with a 3.3 kW prototype are presented at last.
引文
[1]Lee B H,Kim M Y,Kim C E,et al.Analysis of LLC Resonant Converter Considering Effects of Parasitic Components[A].Intelec-international Telecommunications Energy Conference[C].2009:1-6.
[2]陈启超,纪延超,王建赜,等.MOSFET输出电容对CLLLC谐振变换器特性影响分析[J].电工技术学报,2015,30(17):26-35.
[2]陈启超,纪延超,王建赜,等.MOSFET输出电容对CLLLC谐振变换器特性影响分析[J].电工技术学报,2015,30(17):26-35.