【摘要】 设计DC-DC变换器时为了使其满足静态和动态指标的要求,一般需要设计良好的补偿网络,而变换器输出滤波电容的等效串联电阻ESR对补偿网络的影响是不可忽略的。为了探究等效串联电阻对补偿网络的影响,该文采用波特图法对工作在连续工作模式(CCM模式)下的Buck-Boost变换器的稳定性进行分析,并讨论了有无ESR时补偿器的设计方案,结果显示ESR不同,选用的补偿方案也不同;然后利用Matlab工具对补偿后的BuckBoost变换器进行仿真,验证补偿网络设计的正确性。更多还原

【Abstract】 A well-designed compensation network is always needed to the DC-DC converter satisfy the requirements of the static and dynamic indicators. It should not be negligent that ESR of output filter capacitor has effects on the loop compensation. To explore the effect of ESR on loop compensation, the stability of Buck-Boost converter in CCM has been analyzed by Bode diagram in this paper, and appropriate compensation schemes are discussed designed with or without ESR. The results show that with different ESR schemes will ask for different compensation schemes. Simulation results based on Matlab verify the correctness of the compensation network.更多还原