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多相电源的设计需要分析其动态特性和系统稳定性。该文在单相电源的基础上建立了多相电源的小信号模型,并利用控制理论推导了系统的传输函数。利用Bode图分析方法,对多相电源的小信号稳定性和动态特性做了系统上的分析,特别考虑了电压反馈网络和电流反馈网络的各个参数对系统稳定性的影响。在此基础上,设计了多相电源芯片,并指出内环平均电流共享相对于外环平均电流共享的优点:面积小三分之一,功耗小二分之一,同时系统传输函数只有3个极点,系统稳定性要更好。
The design of multi-phase power needs to analyze its dynamic characteristics and system stability. Based on the single-phase power supply, a small-signal model of multiphase power supply is established and the transfer function of the system is deduced by using control theory. The Bode plot analysis method is used to analyze the small signal stability and dynamic characteristics of the multiphase power supply. The influences of the parameters of the voltage feedback network and the current feedback network on the system stability are specially considered. Based on this, a multi-phase power chip is designed and the advantages of sharing the average current of the inner ring with respect to the average current of the outer ring are pointed out: the area is one third smaller and the power consumption is smaller by one half, while the system transfer function is only three A pole, the system stability to be better.