摘要
提出了一种优化电感的设计方法,以最小的电感实现了Buck DC-DC变换器最大输出纹波电压(MOVR)达到极小值.该方法首先通过计算得到连续导电模式(CCM)和不连续导电模式(DCM)下的输出纹波电压,然后根据电感取值分析这两种模式下的MOVR,最终得到了使MOVR达到极小值的最小电感.分析得到,对于任意给定的输入电压和负载范围,计算最大输入电压、最小负载下CCM和DCM模式的临界电感和最小输入电压、最大负载下的临界电感,则最优电感为两者中的较大值.Pspice仿真结果验证了上述理论分析的正确性,开关频率为52kHz,输出电压12V时,对于给定输入电压范围15～21V,负载范围35～170Ω,最优电感为327μH.
In order to realize the lowest maximum output voltage ripple（MOVR） of Buck DC-DC converter with the minimal inductance,an optimal inductance design method is proposed.Output voltage ripple（OVR） under continuous conduction mode（CCM） and discontinuous mode（DCM） was obtained by calculation,then MOVR in the two modes was analyzed according to the inductance value,and ultimately the minimum inductance to achieve the lowest MOVR was obtained.For any given range of the load and input voltage,by comparing the critical inductance between CCM and DCM under the maximum input voltage,minimum load condition and under the minimum input voltage,maximum load condition,it is concluded that the minimum inductance to guarantee the lowest MOVR is actually the maximum value of the critical inductance under the two conditions.The Pspice simulation results are in favor of the proposed theory.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期33-40,共8页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
天津市滨海新区科技计划(2011-BK120033)
天津市科技支撑计划重点项目(09ZCKFGX00900)
